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ASoC: rt5640: Add RL6231 class device shared support for RT5640, RT5645 and RT5651
[deliverable/linux.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>
2f2dc053 10
2f2dc053 11#include "super.h"
3d14c5d2
YS		 12#include "mds_client.h"
13
1fe60e51 14#include <linux/ceph/ceph_features.h>
3d14c5d2
YS		 15#include <linux/ceph/messenger.h>
16#include <linux/ceph/decode.h>
17#include <linux/ceph/pagelist.h>
18#include <linux/ceph/auth.h>
19#include <linux/ceph/debugfs.h>
2f2dc053
SW		 20
21/*
22 * A cluster of MDS (metadata server) daemons is responsible for
23 * managing the file system namespace (the directory hierarchy and
24 * inodes) and for coordinating shared access to storage. Metadata is
25 * partitioning hierarchically across a number of servers, and that
26 * partition varies over time as the cluster adjusts the distribution
27 * in order to balance load.
28 *
29 * The MDS client is primarily responsible to managing synchronous
30 * metadata requests for operations like open, unlink, and so forth.
31 * If there is a MDS failure, we find out about it when we (possibly
32 * request and) receive a new MDS map, and can resubmit affected
33 * requests.
34 *
35 * For the most part, though, we take advantage of a lossless
36 * communications channel to the MDS, and do not need to worry about
37 * timing out or resubmitting requests.
38 *
39 * We maintain a stateful "session" with each MDS we interact with.
40 * Within each session, we sent periodic heartbeat messages to ensure
41 * any capabilities or leases we have been issues remain valid. If
42 * the session times out and goes stale, our leases and capabilities
43 * are no longer valid.
44 */
45
20cb34ae 46struct ceph_reconnect_state {
44c99757 47 int nr_caps;
20cb34ae
SW		 48 struct ceph_pagelist *pagelist;
49 bool flock;
50};
51
2f2dc053
SW		 52static void __wake_requests(struct ceph_mds_client *mdsc,
53 struct list_head *head);
54
9e32789f 55static const struct ceph_connection_operations mds_con_ops;
2f2dc053
SW		 56
57
58/*
59 * mds reply parsing
60 */
61
62/*
63 * parse individual inode info
64 */
65static int parse_reply_info_in(void **p, void *end,
14303d20 66 struct ceph_mds_reply_info_in *info,
12b4629a 67 u64 features)
2f2dc053
SW		 68{
69 int err = -EIO;
70
71 info->in = *p;
72 *p += sizeof(struct ceph_mds_reply_inode) +
73 sizeof(*info->in->fragtree.splits) *
74 le32_to_cpu(info->in->fragtree.nsplits);
75
76 ceph_decode_32_safe(p, end, info->symlink_len, bad);
77 ceph_decode_need(p, end, info->symlink_len, bad);
78 info->symlink = *p;
79 *p += info->symlink_len;
80
14303d20
SW		 81 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
82 ceph_decode_copy_safe(p, end, &info->dir_layout,
83 sizeof(info->dir_layout), bad);
84 else
85 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
86
2f2dc053
SW		 87 ceph_decode_32_safe(p, end, info->xattr_len, bad);
88 ceph_decode_need(p, end, info->xattr_len, bad);
89 info->xattr_data = *p;
90 *p += info->xattr_len;
91 return 0;
92bad:
93 return err;
94}
95
96/*
97 * parse a normal reply, which may contain a (dir+)dentry and/or a
98 * target inode.
99 */
100static int parse_reply_info_trace(void **p, void *end,
14303d20 101 struct ceph_mds_reply_info_parsed *info,
12b4629a 102 u64 features)
2f2dc053
SW		 103{
104 int err;
105
106 if (info->head->is_dentry) {
14303d20 107 err = parse_reply_info_in(p, end, &info->diri, features);
2f2dc053
SW		 108 if (err < 0)
109 goto out_bad;
110
111 if (unlikely(*p + sizeof(*info->dirfrag) > end))
112 goto bad;
113 info->dirfrag = *p;
114 *p += sizeof(*info->dirfrag) +
115 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
116 if (unlikely(*p > end))
117 goto bad;
118
119 ceph_decode_32_safe(p, end, info->dname_len, bad);
120 ceph_decode_need(p, end, info->dname_len, bad);
121 info->dname = *p;
122 *p += info->dname_len;
123 info->dlease = *p;
124 *p += sizeof(*info->dlease);
125 }
126
127 if (info->head->is_target) {
14303d20 128 err = parse_reply_info_in(p, end, &info->targeti, features);
2f2dc053
SW		 129 if (err < 0)
130 goto out_bad;
131 }
132
133 if (unlikely(*p != end))
134 goto bad;
135 return 0;
136
137bad:
138 err = -EIO;
139out_bad:
140 pr_err("problem parsing mds trace %d\n", err);
141 return err;
142}
143
144/*
145 * parse readdir results
146 */
147static int parse_reply_info_dir(void **p, void *end,
14303d20 148 struct ceph_mds_reply_info_parsed *info,
12b4629a 149 u64 features)
2f2dc053
SW		 150{
151 u32 num, i = 0;
152 int err;
153
154 info->dir_dir = *p;
155 if (*p + sizeof(*info->dir_dir) > end)
156 goto bad;
157 *p += sizeof(*info->dir_dir) +
158 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
159 if (*p > end)
160 goto bad;
161
162 ceph_decode_need(p, end, sizeof(num) + 2, bad);
c89136ea
SW		 163 num = ceph_decode_32(p);
164 info->dir_end = ceph_decode_8(p);
165 info->dir_complete = ceph_decode_8(p);
2f2dc053
SW		 166 if (num == 0)
167 goto done;
168
54008399 169 BUG_ON(!info->dir_in);
2f2dc053
SW		 170 info->dir_dname = (void *)(info->dir_in + num);
171 info->dir_dname_len = (void *)(info->dir_dname + num);
172 info->dir_dlease = (void *)(info->dir_dname_len + num);
54008399
YZ		 173 if ((unsigned long)(info->dir_dlease + num) >
174 (unsigned long)info->dir_in + info->dir_buf_size) {
175 pr_err("dir contents are larger than expected\n");
176 WARN_ON(1);
177 goto bad;
178 }
2f2dc053 179
54008399 180 info->dir_nr = num;
2f2dc053
SW		 181 while (num) {
182 /* dentry */
183 ceph_decode_need(p, end, sizeof(u32)*2, bad);
c89136ea 184 info->dir_dname_len[i] = ceph_decode_32(p);
2f2dc053
SW		 185 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
186 info->dir_dname[i] = *p;
187 *p += info->dir_dname_len[i];
188 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
189 info->dir_dname[i]);
190 info->dir_dlease[i] = *p;
191 *p += sizeof(struct ceph_mds_reply_lease);
192
193 /* inode */
14303d20 194 err = parse_reply_info_in(p, end, &info->dir_in[i], features);
2f2dc053
SW		 195 if (err < 0)
196 goto out_bad;
197 i++;
198 num--;
199 }
200
201done:
202 if (*p != end)
203 goto bad;
204 return 0;
205
206bad:
207 err = -EIO;
208out_bad:
209 pr_err("problem parsing dir contents %d\n", err);
210 return err;
211}
212
25933abd
HS		 213/*
214 * parse fcntl F_GETLK results
215 */
216static int parse_reply_info_filelock(void **p, void *end,
14303d20 217 struct ceph_mds_reply_info_parsed *info,
12b4629a 218 u64 features)
25933abd
HS		 219{
220 if (*p + sizeof(*info->filelock_reply) > end)
221 goto bad;
222
223 info->filelock_reply = *p;
224 *p += sizeof(*info->filelock_reply);
225
226 if (unlikely(*p != end))
227 goto bad;
228 return 0;
229
230bad:
231 return -EIO;
232}
233
6e8575fa
SL		 234/*
235 * parse create results
236 */
237static int parse_reply_info_create(void **p, void *end,
238 struct ceph_mds_reply_info_parsed *info,
12b4629a 239 u64 features)
6e8575fa
SL		 240{
241 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
242 if (*p == end) {
243 info->has_create_ino = false;
244 } else {
245 info->has_create_ino = true;
246 info->ino = ceph_decode_64(p);
247 }
248 }
249
250 if (unlikely(*p != end))
251 goto bad;
252 return 0;
253
254bad:
255 return -EIO;
256}
257
25933abd
HS		 258/*
259 * parse extra results
260 */
261static int parse_reply_info_extra(void **p, void *end,
14303d20 262 struct ceph_mds_reply_info_parsed *info,
12b4629a 263 u64 features)
25933abd
HS		 264{
265 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
14303d20 266 return parse_reply_info_filelock(p, end, info, features);
8a034497
YZ		 267 else if (info->head->op == CEPH_MDS_OP_READDIR ||
268 info->head->op == CEPH_MDS_OP_LSSNAP)
14303d20 269 return parse_reply_info_dir(p, end, info, features);
6e8575fa
SL		 270 else if (info->head->op == CEPH_MDS_OP_CREATE)
271 return parse_reply_info_create(p, end, info, features);
272 else
273 return -EIO;
25933abd
HS		 274}
275
2f2dc053
SW		 276/*
277 * parse entire mds reply
278 */
279static int parse_reply_info(struct ceph_msg *msg,
14303d20 280 struct ceph_mds_reply_info_parsed *info,
12b4629a 281 u64 features)
2f2dc053
SW		 282{
283 void *p, *end;
284 u32 len;
285 int err;
286
287 info->head = msg->front.iov_base;
288 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
289 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
290
291 /* trace */
292 ceph_decode_32_safe(&p, end, len, bad);
293 if (len > 0) {
32852a81 294 ceph_decode_need(&p, end, len, bad);
14303d20 295 err = parse_reply_info_trace(&p, p+len, info, features);
2f2dc053
SW		 296 if (err < 0)
297 goto out_bad;
298 }
299
25933abd 300 /* extra */
2f2dc053
SW		 301 ceph_decode_32_safe(&p, end, len, bad);
302 if (len > 0) {
32852a81 303 ceph_decode_need(&p, end, len, bad);
14303d20 304 err = parse_reply_info_extra(&p, p+len, info, features);
2f2dc053
SW		 305 if (err < 0)
306 goto out_bad;
307 }
308
309 /* snap blob */
310 ceph_decode_32_safe(&p, end, len, bad);
311 info->snapblob_len = len;
312 info->snapblob = p;
313 p += len;
314
315 if (p != end)
316 goto bad;
317 return 0;
318
319bad:
320 err = -EIO;
321out_bad:
322 pr_err("mds parse_reply err %d\n", err);
323 return err;
324}
325
326static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
327{
54008399
YZ		 328 if (!info->dir_in)
329 return;
330 free_pages((unsigned long)info->dir_in, get_order(info->dir_buf_size));
2f2dc053
SW		 331}
332
333
334/*
335 * sessions
336 */
337static const char *session_state_name(int s)
338{
339 switch (s) {
340 case CEPH_MDS_SESSION_NEW: return "new";
341 case CEPH_MDS_SESSION_OPENING: return "opening";
342 case CEPH_MDS_SESSION_OPEN: return "open";
343 case CEPH_MDS_SESSION_HUNG: return "hung";
344 case CEPH_MDS_SESSION_CLOSING: return "closing";
44ca18f2 345 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
2f2dc053
SW		 346 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
347 default: return "???";
348 }
349}
350
351static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
352{
353 if (atomic_inc_not_zero(&s->s_ref)) {
354 dout("mdsc get_session %p %d -> %d\n", s,
355 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
356 return s;
357 } else {
358 dout("mdsc get_session %p 0 -- FAIL", s);
359 return NULL;
360 }
361}
362
363void ceph_put_mds_session(struct ceph_mds_session *s)
364{
365 dout("mdsc put_session %p %d -> %d\n", s,
366 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
4e7a5dcd 367 if (atomic_dec_and_test(&s->s_ref)) {
6c4a1915 368 if (s->s_auth.authorizer)
27859f97
SW		 369 ceph_auth_destroy_authorizer(
370 s->s_mdsc->fsc->client->monc.auth,
371 s->s_auth.authorizer);
2f2dc053 372 kfree(s);
4e7a5dcd 373 }
2f2dc053
SW		 374}
375
376/*
377 * called under mdsc->mutex
378 */
379struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
380 int mds)
381{
382 struct ceph_mds_session *session;
383
384 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
385 return NULL;
386 session = mdsc->sessions[mds];
387 dout("lookup_mds_session %p %d\n", session,
388 atomic_read(&session->s_ref));
389 get_session(session);
390 return session;
391}
392
393static bool __have_session(struct ceph_mds_client *mdsc, int mds)
394{
395 if (mds >= mdsc->max_sessions)
396 return false;
397 return mdsc->sessions[mds];
398}
399
2600d2dd
SW		 400static int __verify_registered_session(struct ceph_mds_client *mdsc,
401 struct ceph_mds_session *s)
402{
403 if (s->s_mds >= mdsc->max_sessions ||
404 mdsc->sessions[s->s_mds] != s)
405 return -ENOENT;
406 return 0;
407}
408
2f2dc053
SW		 409/*
410 * create+register a new session for given mds.
411 * called under mdsc->mutex.
412 */
413static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
414 int mds)
415{
416 struct ceph_mds_session *s;
417
c338c07c
NY		 418 if (mds >= mdsc->mdsmap->m_max_mds)
419 return ERR_PTR(-EINVAL);
420
2f2dc053 421 s = kzalloc(sizeof(*s), GFP_NOFS);
4736b009
DC		 422 if (!s)
423 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 424 s->s_mdsc = mdsc;
425 s->s_mds = mds;
426 s->s_state = CEPH_MDS_SESSION_NEW;
427 s->s_ttl = 0;
428 s->s_seq = 0;
429 mutex_init(&s->s_mutex);
430
b7a9e5dd 431 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
2f2dc053 432
d8fb02ab 433 spin_lock_init(&s->s_gen_ttl_lock);
2f2dc053 434 s->s_cap_gen = 0;
1ce208a6 435 s->s_cap_ttl = jiffies - 1;
d8fb02ab
AE		 436
437 spin_lock_init(&s->s_cap_lock);
2f2dc053
SW		 438 s->s_renew_requested = 0;
439 s->s_renew_seq = 0;
440 INIT_LIST_HEAD(&s->s_caps);
441 s->s_nr_caps = 0;
5dacf091 442 s->s_trim_caps = 0;
2f2dc053
SW		 443 atomic_set(&s->s_ref, 1);
444 INIT_LIST_HEAD(&s->s_waiting);
445 INIT_LIST_HEAD(&s->s_unsafe);
446 s->s_num_cap_releases = 0;
99a9c273 447 s->s_cap_reconnect = 0;
7c1332b8 448 s->s_cap_iterator = NULL;
2f2dc053
SW		 449 INIT_LIST_HEAD(&s->s_cap_releases);
450 INIT_LIST_HEAD(&s->s_cap_releases_done);
451 INIT_LIST_HEAD(&s->s_cap_flushing);
452 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
453
454 dout("register_session mds%d\n", mds);
455 if (mds >= mdsc->max_sessions) {
456 int newmax = 1 << get_count_order(mds+1);
457 struct ceph_mds_session **sa;
458
459 dout("register_session realloc to %d\n", newmax);
460 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
461 if (sa == NULL)
42ce56e5 462 goto fail_realloc;
2f2dc053
SW		 463 if (mdsc->sessions) {
464 memcpy(sa, mdsc->sessions,
465 mdsc->max_sessions * sizeof(void *));
466 kfree(mdsc->sessions);
467 }
468 mdsc->sessions = sa;
469 mdsc->max_sessions = newmax;
470 }
471 mdsc->sessions[mds] = s;
472 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
42ce56e5 473
b7a9e5dd
SW		 474 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
475 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
42ce56e5 476
2f2dc053 477 return s;
42ce56e5
SW		 478
479fail_realloc:
480 kfree(s);
481 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 482}
483
484/*
485 * called under mdsc->mutex
486 */
2600d2dd 487static void __unregister_session(struct ceph_mds_client *mdsc,
42ce56e5 488 struct ceph_mds_session *s)
2f2dc053 489{
2600d2dd
SW		 490 dout("__unregister_session mds%d %p\n", s->s_mds, s);
491 BUG_ON(mdsc->sessions[s->s_mds] != s);
42ce56e5
SW		 492 mdsc->sessions[s->s_mds] = NULL;
493 ceph_con_close(&s->s_con);
494 ceph_put_mds_session(s);
2f2dc053
SW		 495}
496
497/*
498 * drop session refs in request.
499 *
500 * should be last request ref, or hold mdsc->mutex
501 */
502static void put_request_session(struct ceph_mds_request *req)
503{
504 if (req->r_session) {
505 ceph_put_mds_session(req->r_session);
506 req->r_session = NULL;
507 }
508}
509
153c8e6b 510void ceph_mdsc_release_request(struct kref *kref)
2f2dc053 511{
153c8e6b
SW		 512 struct ceph_mds_request *req = container_of(kref,
513 struct ceph_mds_request,
514 r_kref);
54008399 515 destroy_reply_info(&req->r_reply_info);
153c8e6b
SW		 516 if (req->r_request)
517 ceph_msg_put(req->r_request);
54008399 518 if (req->r_reply)
153c8e6b 519 ceph_msg_put(req->r_reply);
153c8e6b 520 if (req->r_inode) {
41b02e1f 521 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
153c8e6b
SW		 522 iput(req->r_inode);
523 }
524 if (req->r_locked_dir)
41b02e1f 525 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
153c8e6b
SW		 526 if (req->r_target_inode)
527 iput(req->r_target_inode);
528 if (req->r_dentry)
529 dput(req->r_dentry);
844d87c3
SW		 530 if (req->r_old_dentry)
531 dput(req->r_old_dentry);
532 if (req->r_old_dentry_dir) {
41b02e1f
SW		 533 /*
534 * track (and drop pins for) r_old_dentry_dir
535 * separately, since r_old_dentry's d_parent may have
536 * changed between the dir mutex being dropped and
537 * this request being freed.
538 */
539 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
540 CEPH_CAP_PIN);
41b02e1f 541 iput(req->r_old_dentry_dir);
2f2dc053 542 }
153c8e6b
SW		 543 kfree(req->r_path1);
544 kfree(req->r_path2);
545 put_request_session(req);
37151668 546 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
153c8e6b 547 kfree(req);
2f2dc053
SW		 548}
549
550/*
551 * lookup session, bump ref if found.
552 *
553 * called under mdsc->mutex.
554 */
555static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
556 u64 tid)
557{
558 struct ceph_mds_request *req;
44ca18f2
SW		 559 struct rb_node *n = mdsc->request_tree.rb_node;
560
561 while (n) {
562 req = rb_entry(n, struct ceph_mds_request, r_node);
563 if (tid < req->r_tid)
564 n = n->rb_left;
565 else if (tid > req->r_tid)
566 n = n->rb_right;
567 else {
568 ceph_mdsc_get_request(req);
569 return req;
570 }
571 }
572 return NULL;
573}
574
575static void __insert_request(struct ceph_mds_client *mdsc,
576 struct ceph_mds_request *new)
577{
578 struct rb_node **p = &mdsc->request_tree.rb_node;
579 struct rb_node *parent = NULL;
580 struct ceph_mds_request *req = NULL;
581
582 while (*p) {
583 parent = *p;
584 req = rb_entry(parent, struct ceph_mds_request, r_node);
585 if (new->r_tid < req->r_tid)
586 p = &(*p)->rb_left;
587 else if (new->r_tid > req->r_tid)
588 p = &(*p)->rb_right;
589 else
590 BUG();
591 }
592
593 rb_link_node(&new->r_node, parent, p);
594 rb_insert_color(&new->r_node, &mdsc->request_tree);
2f2dc053
SW		 595}
596
597/*
598 * Register an in-flight request, and assign a tid. Link to directory
599 * are modifying (if any).
600 *
601 * Called under mdsc->mutex.
602 */
603static void __register_request(struct ceph_mds_client *mdsc,
604 struct ceph_mds_request *req,
605 struct inode *dir)
606{
607 req->r_tid = ++mdsc->last_tid;
608 if (req->r_num_caps)
37151668
YS		 609 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
610 req->r_num_caps);
2f2dc053
SW		 611 dout("__register_request %p tid %lld\n", req, req->r_tid);
612 ceph_mdsc_get_request(req);
44ca18f2 613 __insert_request(mdsc, req);
2f2dc053 614
cb4276cc
SW		 615 req->r_uid = current_fsuid();
616 req->r_gid = current_fsgid();
617
2f2dc053
SW		 618 if (dir) {
619 struct ceph_inode_info *ci = ceph_inode(dir);
620
3b663780 621 ihold(dir);
2f2dc053
SW		 622 spin_lock(&ci->i_unsafe_lock);
623 req->r_unsafe_dir = dir;
624 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
625 spin_unlock(&ci->i_unsafe_lock);
626 }
627}
628
629static void __unregister_request(struct ceph_mds_client *mdsc,
630 struct ceph_mds_request *req)
631{
632 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
44ca18f2 633 rb_erase(&req->r_node, &mdsc->request_tree);
80fc7314 634 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 635
636 if (req->r_unsafe_dir) {
637 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
638
639 spin_lock(&ci->i_unsafe_lock);
640 list_del_init(&req->r_unsafe_dir_item);
641 spin_unlock(&ci->i_unsafe_lock);
3b663780
SW		 642
643 iput(req->r_unsafe_dir);
644 req->r_unsafe_dir = NULL;
2f2dc053 645 }
94aa8ae1 646
fc55d2c9
YZ		 647 complete_all(&req->r_safe_completion);
648
94aa8ae1 649 ceph_mdsc_put_request(req);
2f2dc053
SW		 650}
651
652/*
653 * Choose mds to send request to next. If there is a hint set in the
654 * request (e.g., due to a prior forward hint from the mds), use that.
655 * Otherwise, consult frag tree and/or caps to identify the
656 * appropriate mds. If all else fails, choose randomly.
657 *
658 * Called under mdsc->mutex.
659 */
7fd7d101 660static struct dentry *get_nonsnap_parent(struct dentry *dentry)
eb6bb1c5 661{
d79698da
SW		 662 /*
663 * we don't need to worry about protecting the d_parent access
664 * here because we never renaming inside the snapped namespace
665 * except to resplice to another snapdir, and either the old or new
666 * result is a valid result.
667 */
eb6bb1c5
SW		 668 while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
669 dentry = dentry->d_parent;
670 return dentry;
671}
672
2f2dc053
SW		 673static int __choose_mds(struct ceph_mds_client *mdsc,
674 struct ceph_mds_request *req)
675{
676 struct inode *inode;
677 struct ceph_inode_info *ci;
678 struct ceph_cap *cap;
679 int mode = req->r_direct_mode;
680 int mds = -1;
681 u32 hash = req->r_direct_hash;
682 bool is_hash = req->r_direct_is_hash;
683
684 /*
685 * is there a specific mds we should try? ignore hint if we have
686 * no session and the mds is not up (active or recovering).
687 */
688 if (req->r_resend_mds >= 0 &&
689 (__have_session(mdsc, req->r_resend_mds) ||
690 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
691 dout("choose_mds using resend_mds mds%d\n",
692 req->r_resend_mds);
693 return req->r_resend_mds;
694 }
695
696 if (mode == USE_RANDOM_MDS)
697 goto random;
698
699 inode = NULL;
700 if (req->r_inode) {
701 inode = req->r_inode;
702 } else if (req->r_dentry) {
d79698da
SW		 703 /* ignore race with rename; old or new d_parent is okay */
704 struct dentry *parent = req->r_dentry->d_parent;
705 struct inode *dir = parent->d_inode;
eb6bb1c5 706
3d14c5d2 707 if (dir->i_sb != mdsc->fsc->sb) {
eb6bb1c5
SW		 708 /* not this fs! */
709 inode = req->r_dentry->d_inode;
710 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
711 /* direct snapped/virtual snapdir requests
712 * based on parent dir inode */
d79698da 713 struct dentry *dn = get_nonsnap_parent(parent);
eb6bb1c5
SW		 714 inode = dn->d_inode;
715 dout("__choose_mds using nonsnap parent %p\n", inode);
ca18bede 716 } else {
eb6bb1c5 717 /* dentry target */
2f2dc053 718 inode = req->r_dentry->d_inode;
ca18bede
YZ		 719 if (!inode || mode == USE_AUTH_MDS) {
720 /* dir + name */
721 inode = dir;
722 hash = ceph_dentry_hash(dir, req->r_dentry);
723 is_hash = true;
724 }
2f2dc053
SW		 725 }
726 }
eb6bb1c5 727
2f2dc053
SW		 728 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
729 (int)hash, mode);
730 if (!inode)
731 goto random;
732 ci = ceph_inode(inode);
733
734 if (is_hash && S_ISDIR(inode->i_mode)) {
735 struct ceph_inode_frag frag;
736 int found;
737
738 ceph_choose_frag(ci, hash, &frag, &found);
739 if (found) {
740 if (mode == USE_ANY_MDS && frag.ndist > 0) {
741 u8 r;
742
743 /* choose a random replica */
744 get_random_bytes(&r, 1);
745 r %= frag.ndist;
746 mds = frag.dist[r];
747 dout("choose_mds %p %llx.%llx "
748 "frag %u mds%d (%d/%d)\n",
749 inode, ceph_vinop(inode),
d66bbd44 750 frag.frag, mds,
2f2dc053 751 (int)r, frag.ndist);
d66bbd44
SW		 752 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
753 CEPH_MDS_STATE_ACTIVE)
754 return mds;
2f2dc053
SW		 755 }
756
757 /* since this file/dir wasn't known to be
758 * replicated, then we want to look for the
759 * authoritative mds. */
760 mode = USE_AUTH_MDS;
761 if (frag.mds >= 0) {
762 /* choose auth mds */
763 mds = frag.mds;
764 dout("choose_mds %p %llx.%llx "
765 "frag %u mds%d (auth)\n",
766 inode, ceph_vinop(inode), frag.frag, mds);
d66bbd44
SW		 767 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
768 CEPH_MDS_STATE_ACTIVE)
769 return mds;
2f2dc053
SW		 770 }
771 }
772 }
773
be655596 774 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 775 cap = NULL;
776 if (mode == USE_AUTH_MDS)
777 cap = ci->i_auth_cap;
778 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
779 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
780 if (!cap) {
be655596 781 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 782 goto random;
783 }
784 mds = cap->session->s_mds;
785 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
786 inode, ceph_vinop(inode), mds,
787 cap == ci->i_auth_cap ? "auth " : "", cap);
be655596 788 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 789 return mds;
790
791random:
792 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
793 dout("choose_mds chose random mds%d\n", mds);
794 return mds;
795}
796
797
798/*
799 * session messages
800 */
801static struct ceph_msg *create_session_msg(u32 op, u64 seq)
802{
803 struct ceph_msg *msg;
804 struct ceph_mds_session_head *h;
805
b61c2763
SW		 806 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
807 false);
a79832f2 808 if (!msg) {
2f2dc053 809 pr_err("create_session_msg ENOMEM creating msg\n");
a79832f2 810 return NULL;
2f2dc053
SW		 811 }
812 h = msg->front.iov_base;
813 h->op = cpu_to_le32(op);
814 h->seq = cpu_to_le64(seq);
815 return msg;
816}
817
818/*
819 * send session open request.
820 *
821 * called under mdsc->mutex
822 */
823static int __open_session(struct ceph_mds_client *mdsc,
824 struct ceph_mds_session *session)
825{
826 struct ceph_msg *msg;
827 int mstate;
828 int mds = session->s_mds;
2f2dc053
SW		 829
830 /* wait for mds to go active? */
831 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
832 dout("open_session to mds%d (%s)\n", mds,
833 ceph_mds_state_name(mstate));
834 session->s_state = CEPH_MDS_SESSION_OPENING;
835 session->s_renew_requested = jiffies;
836
837 /* send connect message */
838 msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq);
a79832f2
SW		 839 if (!msg)
840 return -ENOMEM;
2f2dc053 841 ceph_con_send(&session->s_con, msg);
2f2dc053
SW		 842 return 0;
843}
844
ed0552a1
SW		 845/*
846 * open sessions for any export targets for the given mds
847 *
848 * called under mdsc->mutex
849 */
5d72d13c
YZ		 850static struct ceph_mds_session *
851__open_export_target_session(struct ceph_mds_client *mdsc, int target)
852{
853 struct ceph_mds_session *session;
854
855 session = __ceph_lookup_mds_session(mdsc, target);
856 if (!session) {
857 session = register_session(mdsc, target);
858 if (IS_ERR(session))
859 return session;
860 }
861 if (session->s_state == CEPH_MDS_SESSION_NEW ||
862 session->s_state == CEPH_MDS_SESSION_CLOSING)
863 __open_session(mdsc, session);
864
865 return session;
866}
867
868struct ceph_mds_session *
869ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
870{
871 struct ceph_mds_session *session;
872
873 dout("open_export_target_session to mds%d\n", target);
874
875 mutex_lock(&mdsc->mutex);
876 session = __open_export_target_session(mdsc, target);
877 mutex_unlock(&mdsc->mutex);
878
879 return session;
880}
881
ed0552a1
SW		 882static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
883 struct ceph_mds_session *session)
884{
885 struct ceph_mds_info *mi;
886 struct ceph_mds_session *ts;
887 int i, mds = session->s_mds;
ed0552a1
SW		 888
889 if (mds >= mdsc->mdsmap->m_max_mds)
890 return;
5d72d13c 891
ed0552a1
SW		 892 mi = &mdsc->mdsmap->m_info[mds];
893 dout("open_export_target_sessions for mds%d (%d targets)\n",
894 session->s_mds, mi->num_export_targets);
895
896 for (i = 0; i < mi->num_export_targets; i++) {
5d72d13c
YZ		 897 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
898 if (!IS_ERR(ts))
899 ceph_put_mds_session(ts);
ed0552a1
SW		 900 }
901}
902
154f42c2
SW		 903void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
904 struct ceph_mds_session *session)
905{
906 mutex_lock(&mdsc->mutex);
907 __open_export_target_sessions(mdsc, session);
908 mutex_unlock(&mdsc->mutex);
909}
910
2f2dc053
SW		 911/*
912 * session caps
913 */
914
915/*
916 * Free preallocated cap messages assigned to this session
917 */
918static void cleanup_cap_releases(struct ceph_mds_session *session)
919{
920 struct ceph_msg *msg;
921
922 spin_lock(&session->s_cap_lock);
923 while (!list_empty(&session->s_cap_releases)) {
924 msg = list_first_entry(&session->s_cap_releases,
925 struct ceph_msg, list_head);
926 list_del_init(&msg->list_head);
927 ceph_msg_put(msg);
928 }
929 while (!list_empty(&session->s_cap_releases_done)) {
930 msg = list_first_entry(&session->s_cap_releases_done,
931 struct ceph_msg, list_head);
932 list_del_init(&msg->list_head);
933 ceph_msg_put(msg);
934 }
935 spin_unlock(&session->s_cap_lock);
936}
937
938/*
f818a736
SW		 939 * Helper to safely iterate over all caps associated with a session, with
940 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 941 *
f818a736 942 * Caller must hold session s_mutex.
2f2dc053
SW		 943 */
944static int iterate_session_caps(struct ceph_mds_session *session,
945 int (*cb)(struct inode *, struct ceph_cap *,
946 void *), void *arg)
947{
7c1332b8
SW		 948 struct list_head *p;
949 struct ceph_cap *cap;
950 struct inode *inode, *last_inode = NULL;
951 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 952 int ret;
953
954 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
955 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 956 p = session->s_caps.next;
957 while (p != &session->s_caps) {
958 cap = list_entry(p, struct ceph_cap, session_caps);
2f2dc053 959 inode = igrab(&cap->ci->vfs_inode);
7c1332b8
SW		 960 if (!inode) {
961 p = p->next;
2f2dc053 962 continue;
7c1332b8
SW		 963 }
964 session->s_cap_iterator = cap;
2f2dc053 965 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 966
967 if (last_inode) {
968 iput(last_inode);
969 last_inode = NULL;
970 }
971 if (old_cap) {
37151668 972 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 973 old_cap = NULL;
974 }
975
2f2dc053 976 ret = cb(inode, cap, arg);
7c1332b8
SW		 977 last_inode = inode;
978
2f2dc053 979 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 980 p = p->next;
981 if (cap->ci == NULL) {
982 dout("iterate_session_caps finishing cap %p removal\n",
983 cap);
984 BUG_ON(cap->session != session);
985 list_del_init(&cap->session_caps);
986 session->s_nr_caps--;
987 cap->session = NULL;
988 old_cap = cap; /* put_cap it w/o locks held */
989 }
5dacf091
SW		 990 if (ret < 0)
991 goto out;
2f2dc053 992 }
5dacf091
SW		 993 ret = 0;
994out:
7c1332b8 995 session->s_cap_iterator = NULL;
2f2dc053 996 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 997
998 if (last_inode)
999 iput(last_inode);
1000 if (old_cap)
37151668 1001 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1002
5dacf091 1003 return ret;
2f2dc053
SW		 1004}
1005
1006static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
6c99f254 1007 void *arg)
2f2dc053
SW		 1008{
1009 struct ceph_inode_info *ci = ceph_inode(inode);
6c99f254
SW		 1010 int drop = 0;
1011
2f2dc053
SW		 1012 dout("removing cap %p, ci is %p, inode is %p\n",
1013 cap, ci, &ci->vfs_inode);
be655596 1014 spin_lock(&ci->i_ceph_lock);
a096b09a 1015 __ceph_remove_cap(cap, false);
6c99f254
SW		 1016 if (!__ceph_is_any_real_caps(ci)) {
1017 struct ceph_mds_client *mdsc =
3d14c5d2 1018 ceph_sb_to_client(inode->i_sb)->mdsc;
6c99f254
SW		 1019
1020 spin_lock(&mdsc->cap_dirty_lock);
1021 if (!list_empty(&ci->i_dirty_item)) {
1022 pr_info(" dropping dirty %s state for %p %lld\n",
1023 ceph_cap_string(ci->i_dirty_caps),
1024 inode, ceph_ino(inode));
1025 ci->i_dirty_caps = 0;
1026 list_del_init(&ci->i_dirty_item);
1027 drop = 1;
1028 }
1029 if (!list_empty(&ci->i_flushing_item)) {
1030 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
1031 ceph_cap_string(ci->i_flushing_caps),
1032 inode, ceph_ino(inode));
1033 ci->i_flushing_caps = 0;
1034 list_del_init(&ci->i_flushing_item);
1035 mdsc->num_cap_flushing--;
1036 drop = 1;
1037 }
1038 if (drop && ci->i_wrbuffer_ref) {
1039 pr_info(" dropping dirty data for %p %lld\n",
1040 inode, ceph_ino(inode));
1041 ci->i_wrbuffer_ref = 0;
1042 ci->i_wrbuffer_ref_head = 0;
1043 drop++;
1044 }
1045 spin_unlock(&mdsc->cap_dirty_lock);
1046 }
be655596 1047 spin_unlock(&ci->i_ceph_lock);
6c99f254
SW		 1048 while (drop--)
1049 iput(inode);
2f2dc053
SW		 1050 return 0;
1051}
1052
1053/*
1054 * caller must hold session s_mutex
1055 */
1056static void remove_session_caps(struct ceph_mds_session *session)
1057{
1058 dout("remove_session_caps on %p\n", session);
1059 iterate_session_caps(session, remove_session_caps_cb, NULL);
6f60f889
YZ		 1060
1061 spin_lock(&session->s_cap_lock);
1062 if (session->s_nr_caps > 0) {
1063 struct super_block *sb = session->s_mdsc->fsc->sb;
1064 struct inode *inode;
1065 struct ceph_cap *cap, *prev = NULL;
1066 struct ceph_vino vino;
1067 /*
1068 * iterate_session_caps() skips inodes that are being
1069 * deleted, we need to wait until deletions are complete.
1070 * __wait_on_freeing_inode() is designed for the job,
1071 * but it is not exported, so use lookup inode function
1072 * to access it.
1073 */
1074 while (!list_empty(&session->s_caps)) {
1075 cap = list_entry(session->s_caps.next,
1076 struct ceph_cap, session_caps);
1077 if (cap == prev)
1078 break;
1079 prev = cap;
1080 vino = cap->ci->i_vino;
1081 spin_unlock(&session->s_cap_lock);
1082
ed284c49 1083 inode = ceph_find_inode(sb, vino);
6f60f889
YZ		 1084 iput(inode);
1085
1086 spin_lock(&session->s_cap_lock);
1087 }
1088 }
1089 spin_unlock(&session->s_cap_lock);
1090
2f2dc053 1091 BUG_ON(session->s_nr_caps > 0);
6c99f254 1092 BUG_ON(!list_empty(&session->s_cap_flushing));
2f2dc053
SW		 1093 cleanup_cap_releases(session);
1094}
1095
1096/*
1097 * wake up any threads waiting on this session's caps. if the cap is
1098 * old (didn't get renewed on the client reconnect), remove it now.
1099 *
1100 * caller must hold s_mutex.
1101 */
1102static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1103 void *arg)
1104{
0dc2570f
SW		 1105 struct ceph_inode_info *ci = ceph_inode(inode);
1106
03066f23 1107 wake_up_all(&ci->i_cap_wq);
0dc2570f 1108 if (arg) {
be655596 1109 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1110 ci->i_wanted_max_size = 0;
1111 ci->i_requested_max_size = 0;
be655596 1112 spin_unlock(&ci->i_ceph_lock);
0dc2570f 1113 }
2f2dc053
SW		 1114 return 0;
1115}
1116
0dc2570f
SW		 1117static void wake_up_session_caps(struct ceph_mds_session *session,
1118 int reconnect)
2f2dc053
SW		 1119{
1120 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
0dc2570f
SW		 1121 iterate_session_caps(session, wake_up_session_cb,
1122 (void *)(unsigned long)reconnect);
2f2dc053
SW		 1123}
1124
1125/*
1126 * Send periodic message to MDS renewing all currently held caps. The
1127 * ack will reset the expiration for all caps from this session.
1128 *
1129 * caller holds s_mutex
1130 */
1131static int send_renew_caps(struct ceph_mds_client *mdsc,
1132 struct ceph_mds_session *session)
1133{
1134 struct ceph_msg *msg;
1135 int state;
1136
1137 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1138 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1139 pr_info("mds%d caps stale\n", session->s_mds);
e4cb4cb8 1140 session->s_renew_requested = jiffies;
2f2dc053
SW		 1141
1142 /* do not try to renew caps until a recovering mds has reconnected
1143 * with its clients. */
1144 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1145 if (state < CEPH_MDS_STATE_RECONNECT) {
1146 dout("send_renew_caps ignoring mds%d (%s)\n",
1147 session->s_mds, ceph_mds_state_name(state));
1148 return 0;
1149 }
1150
1151 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1152 ceph_mds_state_name(state));
2f2dc053
SW		 1153 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1154 ++session->s_renew_seq);
a79832f2
SW		 1155 if (!msg)
1156 return -ENOMEM;
2f2dc053
SW		 1157 ceph_con_send(&session->s_con, msg);
1158 return 0;
1159}
1160
186e4f7a
YZ		 1161static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1162 struct ceph_mds_session *session, u64 seq)
1163{
1164 struct ceph_msg *msg;
1165
1166 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1167 session->s_mds, session_state_name(session->s_state), seq);
1168 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1169 if (!msg)
1170 return -ENOMEM;
1171 ceph_con_send(&session->s_con, msg);
1172 return 0;
1173}
1174
1175
2f2dc053
SW		 1176/*
1177 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 1178 *
1179 * Called under session->s_mutex
2f2dc053
SW		 1180 */
1181static void renewed_caps(struct ceph_mds_client *mdsc,
1182 struct ceph_mds_session *session, int is_renew)
1183{
1184 int was_stale;
1185 int wake = 0;
1186
1187 spin_lock(&session->s_cap_lock);
1ce208a6 1188 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 1189
1190 session->s_cap_ttl = session->s_renew_requested +
1191 mdsc->mdsmap->m_session_timeout*HZ;
1192
1193 if (was_stale) {
1194 if (time_before(jiffies, session->s_cap_ttl)) {
1195 pr_info("mds%d caps renewed\n", session->s_mds);
1196 wake = 1;
1197 } else {
1198 pr_info("mds%d caps still stale\n", session->s_mds);
1199 }
1200 }
1201 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1202 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1203 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1204 spin_unlock(&session->s_cap_lock);
1205
1206 if (wake)
0dc2570f 1207 wake_up_session_caps(session, 0);
2f2dc053
SW		 1208}
1209
1210/*
1211 * send a session close request
1212 */
1213static int request_close_session(struct ceph_mds_client *mdsc,
1214 struct ceph_mds_session *session)
1215{
1216 struct ceph_msg *msg;
2f2dc053
SW		 1217
1218 dout("request_close_session mds%d state %s seq %lld\n",
1219 session->s_mds, session_state_name(session->s_state),
1220 session->s_seq);
1221 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
a79832f2
SW		 1222 if (!msg)
1223 return -ENOMEM;
1224 ceph_con_send(&session->s_con, msg);
1225 return 0;
2f2dc053
SW		 1226}
1227
1228/*
1229 * Called with s_mutex held.
1230 */
1231static int __close_session(struct ceph_mds_client *mdsc,
1232 struct ceph_mds_session *session)
1233{
1234 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1235 return 0;
1236 session->s_state = CEPH_MDS_SESSION_CLOSING;
1237 return request_close_session(mdsc, session);
1238}
1239
1240/*
1241 * Trim old(er) caps.
1242 *
1243 * Because we can't cache an inode without one or more caps, we do
1244 * this indirectly: if a cap is unused, we prune its aliases, at which
1245 * point the inode will hopefully get dropped to.
1246 *
1247 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1248 * memory pressure from the MDS, though, so it needn't be perfect.
1249 */
1250static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1251{
1252 struct ceph_mds_session *session = arg;
1253 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 1254 int used, wanted, oissued, mine;
2f2dc053
SW		 1255
1256 if (session->s_trim_caps <= 0)
1257 return -1;
1258
be655596 1259 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1260 mine = cap->issued | cap->implemented;
1261 used = __ceph_caps_used(ci);
979abfdd 1262 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 1263 oissued = __ceph_caps_issued_other(ci, cap);
1264
979abfdd 1265 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
2f2dc053 1266 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
979abfdd
YZ		 1267 ceph_cap_string(used), ceph_cap_string(wanted));
1268 if (cap == ci->i_auth_cap) {
1269 if (ci->i_dirty_caps | ci->i_flushing_caps)
1270 goto out;
1271 if ((used | wanted) & CEPH_CAP_ANY_WR)
1272 goto out;
1273 }
1274 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 1275 goto out; /* we need these caps */
1276
1277 session->s_trim_caps--;
1278 if (oissued) {
1279 /* we aren't the only cap.. just remove us */
a096b09a 1280 __ceph_remove_cap(cap, true);
2f2dc053
SW		 1281 } else {
1282 /* try to drop referring dentries */
be655596 1283 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1284 d_prune_aliases(inode);
1285 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1286 inode, cap, atomic_read(&inode->i_count));
1287 return 0;
1288 }
1289
1290out:
be655596 1291 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1292 return 0;
1293}
1294
1295/*
1296 * Trim session cap count down to some max number.
1297 */
1298static int trim_caps(struct ceph_mds_client *mdsc,
1299 struct ceph_mds_session *session,
1300 int max_caps)
1301{
1302 int trim_caps = session->s_nr_caps - max_caps;
1303
1304 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1305 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1306 if (trim_caps > 0) {
1307 session->s_trim_caps = trim_caps;
1308 iterate_session_caps(session, trim_caps_cb, session);
1309 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1310 session->s_mds, session->s_nr_caps, max_caps,
1311 trim_caps - session->s_trim_caps);
5dacf091 1312 session->s_trim_caps = 0;
2f2dc053 1313 }
a56371d9
YZ		 1314
1315 ceph_add_cap_releases(mdsc, session);
1316 ceph_send_cap_releases(mdsc, session);
2f2dc053
SW		 1317 return 0;
1318}
1319
1320/*
1321 * Allocate cap_release messages. If there is a partially full message
1322 * in the queue, try to allocate enough to cover it's remainder, so that
1323 * we can send it immediately.
1324 *
1325 * Called under s_mutex.
1326 */
2b2300d6 1327int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
ee6b272b 1328 struct ceph_mds_session *session)
2f2dc053 1329{
38e8883e 1330 struct ceph_msg *msg, *partial = NULL;
2f2dc053
SW		 1331 struct ceph_mds_cap_release *head;
1332 int err = -ENOMEM;
3d14c5d2 1333 int extra = mdsc->fsc->mount_options->cap_release_safety;
38e8883e 1334 int num;
2f2dc053 1335
38e8883e
SW		 1336 dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
1337 extra);
2f2dc053
SW		 1338
1339 spin_lock(&session->s_cap_lock);
1340
1341 if (!list_empty(&session->s_cap_releases)) {
1342 msg = list_first_entry(&session->s_cap_releases,
1343 struct ceph_msg,
1344 list_head);
1345 head = msg->front.iov_base;
38e8883e
SW		 1346 num = le32_to_cpu(head->num);
1347 if (num) {
1348 dout(" partial %p with (%d/%d)\n", msg, num,
1349 (int)CEPH_CAPS_PER_RELEASE);
1350 extra += CEPH_CAPS_PER_RELEASE - num;
1351 partial = msg;
1352 }
2f2dc053 1353 }
2f2dc053
SW		 1354 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1355 spin_unlock(&session->s_cap_lock);
34d23762 1356 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
b61c2763 1357 GFP_NOFS, false);
2f2dc053
SW		 1358 if (!msg)
1359 goto out_unlocked;
1360 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1361 (int)msg->front.iov_len);
1362 head = msg->front.iov_base;
1363 head->num = cpu_to_le32(0);
1364 msg->front.iov_len = sizeof(*head);
1365 spin_lock(&session->s_cap_lock);
1366 list_add(&msg->list_head, &session->s_cap_releases);
1367 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1368 }
1369
38e8883e
SW		 1370 if (partial) {
1371 head = partial->front.iov_base;
1372 num = le32_to_cpu(head->num);
1373 dout(" queueing partial %p with %d/%d\n", partial, num,
1374 (int)CEPH_CAPS_PER_RELEASE);
1375 list_move_tail(&partial->list_head,
1376 &session->s_cap_releases_done);
1377 session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
2f2dc053
SW		 1378 }
1379 err = 0;
1380 spin_unlock(&session->s_cap_lock);
1381out_unlocked:
1382 return err;
1383}
1384
1385/*
1386 * flush all dirty inode data to disk.
1387 *
1388 * returns true if we've flushed through want_flush_seq
1389 */
1390static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
1391{
1392 int mds, ret = 1;
1393
1394 dout("check_cap_flush want %lld\n", want_flush_seq);
1395 mutex_lock(&mdsc->mutex);
1396 for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
1397 struct ceph_mds_session *session = mdsc->sessions[mds];
1398
1399 if (!session)
1400 continue;
1401 get_session(session);
1402 mutex_unlock(&mdsc->mutex);
1403
1404 mutex_lock(&session->s_mutex);
1405 if (!list_empty(&session->s_cap_flushing)) {
1406 struct ceph_inode_info *ci =
1407 list_entry(session->s_cap_flushing.next,
1408 struct ceph_inode_info,
1409 i_flushing_item);
1410 struct inode *inode = &ci->vfs_inode;
1411
be655596 1412 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1413 if (ci->i_cap_flush_seq <= want_flush_seq) {
1414 dout("check_cap_flush still flushing %p "
1415 "seq %lld <= %lld to mds%d\n", inode,
1416 ci->i_cap_flush_seq, want_flush_seq,
1417 session->s_mds);
1418 ret = 0;
1419 }
be655596 1420 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1421 }
1422 mutex_unlock(&session->s_mutex);
1423 ceph_put_mds_session(session);
1424
1425 if (!ret)
1426 return ret;
1427 mutex_lock(&mdsc->mutex);
1428 }
1429
1430 mutex_unlock(&mdsc->mutex);
1431 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
1432 return ret;
1433}
1434
1435/*
1436 * called under s_mutex
1437 */
3d7ded4d
SW		 1438void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1439 struct ceph_mds_session *session)
2f2dc053
SW		 1440{
1441 struct ceph_msg *msg;
1442
1443 dout("send_cap_releases mds%d\n", session->s_mds);
0f8605f2
SW		 1444 spin_lock(&session->s_cap_lock);
1445 while (!list_empty(&session->s_cap_releases_done)) {
2f2dc053
SW		 1446 msg = list_first_entry(&session->s_cap_releases_done,
1447 struct ceph_msg, list_head);
1448 list_del_init(&msg->list_head);
1449 spin_unlock(&session->s_cap_lock);
1450 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1451 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1452 ceph_con_send(&session->s_con, msg);
0f8605f2 1453 spin_lock(&session->s_cap_lock);
2f2dc053
SW		 1454 }
1455 spin_unlock(&session->s_cap_lock);
1456}
1457
e01a5946
SW		 1458static void discard_cap_releases(struct ceph_mds_client *mdsc,
1459 struct ceph_mds_session *session)
1460{
1461 struct ceph_msg *msg;
1462 struct ceph_mds_cap_release *head;
1463 unsigned num;
1464
1465 dout("discard_cap_releases mds%d\n", session->s_mds);
e01a5946 1466
00bd8edb
YZ		 1467 if (!list_empty(&session->s_cap_releases)) {
1468 /* zero out the in-progress message */
1469 msg = list_first_entry(&session->s_cap_releases,
1470 struct ceph_msg, list_head);
1471 head = msg->front.iov_base;
1472 num = le32_to_cpu(head->num);
1473 dout("discard_cap_releases mds%d %p %u\n",
1474 session->s_mds, msg, num);
1475 head->num = cpu_to_le32(0);
1476 msg->front.iov_len = sizeof(*head);
1477 session->s_num_cap_releases += num;
1478 }
e01a5946
SW		 1479
1480 /* requeue completed messages */
1481 while (!list_empty(&session->s_cap_releases_done)) {
1482 msg = list_first_entry(&session->s_cap_releases_done,
1483 struct ceph_msg, list_head);
1484 list_del_init(&msg->list_head);
1485
1486 head = msg->front.iov_base;
1487 num = le32_to_cpu(head->num);
1488 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
1489 num);
1490 session->s_num_cap_releases += num;
1491 head->num = cpu_to_le32(0);
1492 msg->front.iov_len = sizeof(*head);
1493 list_add(&msg->list_head, &session->s_cap_releases);
1494 }
e01a5946
SW		 1495}
1496
2f2dc053
SW		 1497/*
1498 * requests
1499 */
1500
54008399
YZ		 1501int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1502 struct inode *dir)
1503{
1504 struct ceph_inode_info *ci = ceph_inode(dir);
1505 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1506 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1507 size_t size = sizeof(*rinfo->dir_in) + sizeof(*rinfo->dir_dname_len) +
1508 sizeof(*rinfo->dir_dname) + sizeof(*rinfo->dir_dlease);
1509 int order, num_entries;
1510
1511 spin_lock(&ci->i_ceph_lock);
1512 num_entries = ci->i_files + ci->i_subdirs;
1513 spin_unlock(&ci->i_ceph_lock);
1514 num_entries = max(num_entries, 1);
1515 num_entries = min(num_entries, opt->max_readdir);
1516
1517 order = get_order(size * num_entries);
1518 while (order >= 0) {
1519 rinfo->dir_in = (void*)__get_free_pages(GFP_NOFS | __GFP_NOWARN,
1520 order);
1521 if (rinfo->dir_in)
1522 break;
1523 order--;
1524 }
1525 if (!rinfo->dir_in)
1526 return -ENOMEM;
1527
1528 num_entries = (PAGE_SIZE << order) / size;
1529 num_entries = min(num_entries, opt->max_readdir);
1530
1531 rinfo->dir_buf_size = PAGE_SIZE << order;
1532 req->r_num_caps = num_entries + 1;
1533 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1534 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1535 return 0;
1536}
1537
2f2dc053
SW		 1538/*
1539 * Create an mds request.
1540 */
1541struct ceph_mds_request *
1542ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1543{
1544 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1545
1546 if (!req)
1547 return ERR_PTR(-ENOMEM);
1548
b4556396 1549 mutex_init(&req->r_fill_mutex);
37151668 1550 req->r_mdsc = mdsc;
2f2dc053
SW		 1551 req->r_started = jiffies;
1552 req->r_resend_mds = -1;
1553 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1554 req->r_fmode = -1;
153c8e6b 1555 kref_init(&req->r_kref);
2f2dc053
SW		 1556 INIT_LIST_HEAD(&req->r_wait);
1557 init_completion(&req->r_completion);
1558 init_completion(&req->r_safe_completion);
1559 INIT_LIST_HEAD(&req->r_unsafe_item);
1560
1561 req->r_op = op;
1562 req->r_direct_mode = mode;
1563 return req;
1564}
1565
1566/*
44ca18f2 1567 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 1568 *
1569 * called under mdsc->mutex.
1570 */
44ca18f2
SW		 1571static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1572{
1573 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1574 return NULL;
1575 return rb_entry(rb_first(&mdsc->request_tree),
1576 struct ceph_mds_request, r_node);
1577}
1578
2f2dc053
SW		 1579static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1580{
44ca18f2
SW		 1581 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1582
1583 if (req)
1584 return req->r_tid;
1585 return 0;
2f2dc053
SW		 1586}
1587
1588/*
1589 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1590 * on build_path_from_dentry in fs/cifs/dir.c.
1591 *
1592 * If @stop_on_nosnap, generate path relative to the first non-snapped
1593 * inode.
1594 *
1595 * Encode hidden .snap dirs as a double /, i.e.
1596 * foo/.snap/bar -> foo//bar
1597 */
1598char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1599 int stop_on_nosnap)
1600{
1601 struct dentry *temp;
1602 char *path;
1603 int len, pos;
1b71fe2e 1604 unsigned seq;
2f2dc053
SW		 1605
1606 if (dentry == NULL)
1607 return ERR_PTR(-EINVAL);
1608
1609retry:
1610 len = 0;
1b71fe2e
AV		 1611 seq = read_seqbegin(&rename_lock);
1612 rcu_read_lock();
2f2dc053
SW		 1613 for (temp = dentry; !IS_ROOT(temp);) {
1614 struct inode *inode = temp->d_inode;
1615 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1616 len++; /* slash only */
1617 else if (stop_on_nosnap && inode &&
1618 ceph_snap(inode) == CEPH_NOSNAP)
1619 break;
1620 else
1621 len += 1 + temp->d_name.len;
1622 temp = temp->d_parent;
2f2dc053 1623 }
1b71fe2e 1624 rcu_read_unlock();
2f2dc053
SW		 1625 if (len)
1626 len--; /* no leading '/' */
1627
1628 path = kmalloc(len+1, GFP_NOFS);
1629 if (path == NULL)
1630 return ERR_PTR(-ENOMEM);
1631 pos = len;
1632 path[pos] = 0; /* trailing null */
1b71fe2e 1633 rcu_read_lock();
2f2dc053 1634 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1b71fe2e 1635 struct inode *inode;
2f2dc053 1636
1b71fe2e
AV		 1637 spin_lock(&temp->d_lock);
1638 inode = temp->d_inode;
2f2dc053 1639 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
104648ad 1640 dout("build_path path+%d: %p SNAPDIR\n",
2f2dc053
SW		 1641 pos, temp);
1642 } else if (stop_on_nosnap && inode &&
1643 ceph_snap(inode) == CEPH_NOSNAP) {
9d5a09e6 1644 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1645 break;
1646 } else {
1647 pos -= temp->d_name.len;
1b71fe2e
AV		 1648 if (pos < 0) {
1649 spin_unlock(&temp->d_lock);
2f2dc053 1650 break;
1b71fe2e 1651 }
2f2dc053
SW		 1652 strncpy(path + pos, temp->d_name.name,
1653 temp->d_name.len);
2f2dc053 1654 }
1b71fe2e 1655 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1656 if (pos)
1657 path[--pos] = '/';
1658 temp = temp->d_parent;
2f2dc053 1659 }
1b71fe2e
AV		 1660 rcu_read_unlock();
1661 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
104648ad 1662 pr_err("build_path did not end path lookup where "
2f2dc053
SW		 1663 "expected, namelen is %d, pos is %d\n", len, pos);
1664 /* presumably this is only possible if racing with a
1665 rename of one of the parent directories (we can not
1666 lock the dentries above us to prevent this, but
1667 retrying should be harmless) */
1668 kfree(path);
1669 goto retry;
1670 }
1671
1672 *base = ceph_ino(temp->d_inode);
1673 *plen = len;
104648ad 1674 dout("build_path on %p %d built %llx '%.*s'\n",
84d08fa8 1675 dentry, d_count(dentry), *base, len, path);
2f2dc053
SW		 1676 return path;
1677}
1678
1679static int build_dentry_path(struct dentry *dentry,
1680 const char **ppath, int *ppathlen, u64 *pino,
1681 int *pfreepath)
1682{
1683 char *path;
1684
1685 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1686 *pino = ceph_ino(dentry->d_parent->d_inode);
1687 *ppath = dentry->d_name.name;
1688 *ppathlen = dentry->d_name.len;
1689 return 0;
1690 }
1691 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1692 if (IS_ERR(path))
1693 return PTR_ERR(path);
1694 *ppath = path;
1695 *pfreepath = 1;
1696 return 0;
1697}
1698
1699static int build_inode_path(struct inode *inode,
1700 const char **ppath, int *ppathlen, u64 *pino,
1701 int *pfreepath)
1702{
1703 struct dentry *dentry;
1704 char *path;
1705
1706 if (ceph_snap(inode) == CEPH_NOSNAP) {
1707 *pino = ceph_ino(inode);
1708 *ppathlen = 0;
1709 return 0;
1710 }
1711 dentry = d_find_alias(inode);
1712 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1713 dput(dentry);
1714 if (IS_ERR(path))
1715 return PTR_ERR(path);
1716 *ppath = path;
1717 *pfreepath = 1;
1718 return 0;
1719}
1720
1721/*
1722 * request arguments may be specified via an inode *, a dentry *, or
1723 * an explicit ino+path.
1724 */
1725static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1726 const char *rpath, u64 rino,
1727 const char **ppath, int *pathlen,
1728 u64 *ino, int *freepath)
1729{
1730 int r = 0;
1731
1732 if (rinode) {
1733 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1734 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1735 ceph_snap(rinode));
1736 } else if (rdentry) {
1737 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1738 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1739 *ppath);
795858db 1740 } else if (rpath || rino) {
2f2dc053
SW		 1741 *ino = rino;
1742 *ppath = rpath;
b000056a 1743 *pathlen = rpath ? strlen(rpath) : 0;
2f2dc053
SW		 1744 dout(" path %.*s\n", *pathlen, rpath);
1745 }
1746
1747 return r;
1748}
1749
1750/*
1751 * called under mdsc->mutex
1752 */
1753static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1754 struct ceph_mds_request *req,
1755 int mds)
1756{
1757 struct ceph_msg *msg;
1758 struct ceph_mds_request_head *head;
1759 const char *path1 = NULL;
1760 const char *path2 = NULL;
1761 u64 ino1 = 0, ino2 = 0;
1762 int pathlen1 = 0, pathlen2 = 0;
1763 int freepath1 = 0, freepath2 = 0;
1764 int len;
1765 u16 releases;
1766 void *p, *end;
1767 int ret;
1768
1769 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1770 req->r_path1, req->r_ino1.ino,
1771 &path1, &pathlen1, &ino1, &freepath1);
1772 if (ret < 0) {
1773 msg = ERR_PTR(ret);
1774 goto out;
1775 }
1776
1777 ret = set_request_path_attr(NULL, req->r_old_dentry,
1778 req->r_path2, req->r_ino2.ino,
1779 &path2, &pathlen2, &ino2, &freepath2);
1780 if (ret < 0) {
1781 msg = ERR_PTR(ret);
1782 goto out_free1;
1783 }
1784
1785 len = sizeof(*head) +
ac8839d7 1786 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
2f2dc053
SW		 1787
1788 /* calculate (max) length for cap releases */
1789 len += sizeof(struct ceph_mds_request_release) *
1790 (!!req->r_inode_drop + !!req->r_dentry_drop +
1791 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1792 if (req->r_dentry_drop)
1793 len += req->r_dentry->d_name.len;
1794 if (req->r_old_dentry_drop)
1795 len += req->r_old_dentry->d_name.len;
1796
b61c2763 1797 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
a79832f2
SW		 1798 if (!msg) {
1799 msg = ERR_PTR(-ENOMEM);
2f2dc053 1800 goto out_free2;
a79832f2 1801 }
2f2dc053 1802
6df058c0
SW		 1803 msg->hdr.tid = cpu_to_le64(req->r_tid);
1804
2f2dc053
SW		 1805 head = msg->front.iov_base;
1806 p = msg->front.iov_base + sizeof(*head);
1807 end = msg->front.iov_base + msg->front.iov_len;
1808
1809 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1810 head->op = cpu_to_le32(req->r_op);
ff3d0046
EB		 1811 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1812 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2f2dc053
SW		 1813 head->args = req->r_args;
1814
1815 ceph_encode_filepath(&p, end, ino1, path1);
1816 ceph_encode_filepath(&p, end, ino2, path2);
1817
e979cf50
SW		 1818 /* make note of release offset, in case we need to replay */
1819 req->r_request_release_offset = p - msg->front.iov_base;
1820
2f2dc053
SW		 1821 /* cap releases */
1822 releases = 0;
1823 if (req->r_inode_drop)
1824 releases += ceph_encode_inode_release(&p,
1825 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1826 mds, req->r_inode_drop, req->r_inode_unless, 0);
1827 if (req->r_dentry_drop)
1828 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1829 mds, req->r_dentry_drop, req->r_dentry_unless);
1830 if (req->r_old_dentry_drop)
1831 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1832 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1833 if (req->r_old_inode_drop)
1834 releases += ceph_encode_inode_release(&p,
1835 req->r_old_dentry->d_inode,
1836 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1837 head->num_releases = cpu_to_le16(releases);
1838
1839 BUG_ON(p > end);
1840 msg->front.iov_len = p - msg->front.iov_base;
1841 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1842
ebf18f47
AE		 1843 if (req->r_data_len) {
1844 /* outbound data set only by ceph_sync_setxattr() */
1845 BUG_ON(!req->r_pages);
90af3602 1846 ceph_msg_data_add_pages(msg, req->r_pages, req->r_data_len, 0);
ebf18f47 1847 }
02afca6c 1848
2f2dc053
SW		 1849 msg->hdr.data_len = cpu_to_le32(req->r_data_len);
1850 msg->hdr.data_off = cpu_to_le16(0);
1851
1852out_free2:
1853 if (freepath2)
1854 kfree((char *)path2);
1855out_free1:
1856 if (freepath1)
1857 kfree((char *)path1);
1858out:
1859 return msg;
1860}
1861
1862/*
1863 * called under mdsc->mutex if error, under no mutex if
1864 * success.
1865 */
1866static void complete_request(struct ceph_mds_client *mdsc,
1867 struct ceph_mds_request *req)
1868{
1869 if (req->r_callback)
1870 req->r_callback(mdsc, req);
1871 else
03066f23 1872 complete_all(&req->r_completion);
2f2dc053
SW		 1873}
1874
1875/*
1876 * called under mdsc->mutex
1877 */
1878static int __prepare_send_request(struct ceph_mds_client *mdsc,
1879 struct ceph_mds_request *req,
1880 int mds)
1881{
1882 struct ceph_mds_request_head *rhead;
1883 struct ceph_msg *msg;
1884 int flags = 0;
1885
2f2dc053 1886 req->r_attempts++;
e55b71f8
GF		 1887 if (req->r_inode) {
1888 struct ceph_cap *cap =
1889 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
1890
1891 if (cap)
1892 req->r_sent_on_mseq = cap->mseq;
1893 else
1894 req->r_sent_on_mseq = -1;
1895 }
2f2dc053
SW		 1896 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
1897 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
1898
01a92f17
SW		 1899 if (req->r_got_unsafe) {
1900 /*
1901 * Replay. Do not regenerate message (and rebuild
1902 * paths, etc.); just use the original message.
1903 * Rebuilding paths will break for renames because
1904 * d_move mangles the src name.
1905 */
1906 msg = req->r_request;
1907 rhead = msg->front.iov_base;
1908
1909 flags = le32_to_cpu(rhead->flags);
1910 flags |= CEPH_MDS_FLAG_REPLAY;
1911 rhead->flags = cpu_to_le32(flags);
1912
1913 if (req->r_target_inode)
1914 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
1915
1916 rhead->num_retry = req->r_attempts - 1;
e979cf50
SW		 1917
1918 /* remove cap/dentry releases from message */
1919 rhead->num_releases = 0;
1920 msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset);
1921 msg->front.iov_len = req->r_request_release_offset;
01a92f17
SW		 1922 return 0;
1923 }
1924
2f2dc053
SW		 1925 if (req->r_request) {
1926 ceph_msg_put(req->r_request);
1927 req->r_request = NULL;
1928 }
1929 msg = create_request_message(mdsc, req, mds);
1930 if (IS_ERR(msg)) {
e1518c7c 1931 req->r_err = PTR_ERR(msg);
2f2dc053 1932 complete_request(mdsc, req);
a79832f2 1933 return PTR_ERR(msg);
2f2dc053
SW		 1934 }
1935 req->r_request = msg;
1936
1937 rhead = msg->front.iov_base;
2f2dc053
SW		 1938 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
1939 if (req->r_got_unsafe)
1940 flags |= CEPH_MDS_FLAG_REPLAY;
1941 if (req->r_locked_dir)
1942 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
1943 rhead->flags = cpu_to_le32(flags);
1944 rhead->num_fwd = req->r_num_fwd;
1945 rhead->num_retry = req->r_attempts - 1;
01a92f17 1946 rhead->ino = 0;
2f2dc053
SW		 1947
1948 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2f2dc053
SW		 1949 return 0;
1950}
1951
1952/*
1953 * send request, or put it on the appropriate wait list.
1954 */
1955static int __do_request(struct ceph_mds_client *mdsc,
1956 struct ceph_mds_request *req)
1957{
1958 struct ceph_mds_session *session = NULL;
1959 int mds = -1;
1960 int err = -EAGAIN;
1961
eb1b8af3
YZ		 1962 if (req->r_err || req->r_got_result) {
1963 if (req->r_aborted)
1964 __unregister_request(mdsc, req);
2f2dc053 1965 goto out;
eb1b8af3 1966 }
2f2dc053
SW		 1967
1968 if (req->r_timeout &&
1969 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
1970 dout("do_request timed out\n");
1971 err = -EIO;
1972 goto finish;
1973 }
1974
dc69e2e9
SW		 1975 put_request_session(req);
1976
2f2dc053
SW		 1977 mds = __choose_mds(mdsc, req);
1978 if (mds < 0 ||
1979 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
1980 dout("do_request no mds or not active, waiting for map\n");
1981 list_add(&req->r_wait, &mdsc->waiting_for_map);
1982 goto out;
1983 }
1984
1985 /* get, open session */
1986 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 1987 if (!session) {
2f2dc053 1988 session = register_session(mdsc, mds);
9c423956
SW		 1989 if (IS_ERR(session)) {
1990 err = PTR_ERR(session);
1991 goto finish;
1992 }
1993 }
dc69e2e9
SW		 1994 req->r_session = get_session(session);
1995
2f2dc053
SW		 1996 dout("do_request mds%d session %p state %s\n", mds, session,
1997 session_state_name(session->s_state));
1998 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
1999 session->s_state != CEPH_MDS_SESSION_HUNG) {
2000 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2001 session->s_state == CEPH_MDS_SESSION_CLOSING)
2002 __open_session(mdsc, session);
2003 list_add(&req->r_wait, &session->s_waiting);
2004 goto out_session;
2005 }
2006
2007 /* send request */
2f2dc053
SW		 2008 req->r_resend_mds = -1; /* forget any previous mds hint */
2009
2010 if (req->r_request_started == 0) /* note request start time */
2011 req->r_request_started = jiffies;
2012
2013 err = __prepare_send_request(mdsc, req, mds);
2014 if (!err) {
2015 ceph_msg_get(req->r_request);
2016 ceph_con_send(&session->s_con, req->r_request);
2017 }
2018
2019out_session:
2020 ceph_put_mds_session(session);
2021out:
2022 return err;
2023
2024finish:
e1518c7c 2025 req->r_err = err;
2f2dc053
SW		 2026 complete_request(mdsc, req);
2027 goto out;
2028}
2029
2030/*
2031 * called under mdsc->mutex
2032 */
2033static void __wake_requests(struct ceph_mds_client *mdsc,
2034 struct list_head *head)
2035{
ed75ec2c
YZ		 2036 struct ceph_mds_request *req;
2037 LIST_HEAD(tmp_list);
2038
2039 list_splice_init(head, &tmp_list);
2f2dc053 2040
ed75ec2c
YZ		 2041 while (!list_empty(&tmp_list)) {
2042 req = list_entry(tmp_list.next,
2043 struct ceph_mds_request, r_wait);
2f2dc053 2044 list_del_init(&req->r_wait);
7971bd92 2045 dout(" wake request %p tid %llu\n", req, req->r_tid);
2f2dc053
SW		 2046 __do_request(mdsc, req);
2047 }
2048}
2049
2050/*
2051 * Wake up threads with requests pending for @mds, so that they can
29790f26 2052 * resubmit their requests to a possibly different mds.
2f2dc053 2053 */
29790f26 2054static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 2055{
44ca18f2
SW		 2056 struct ceph_mds_request *req;
2057 struct rb_node *p;
2f2dc053
SW		 2058
2059 dout("kick_requests mds%d\n", mds);
44ca18f2
SW		 2060 for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
2061 req = rb_entry(p, struct ceph_mds_request, r_node);
2062 if (req->r_got_unsafe)
2063 continue;
2064 if (req->r_session &&
2065 req->r_session->s_mds == mds) {
2066 dout(" kicking tid %llu\n", req->r_tid);
44ca18f2 2067 __do_request(mdsc, req);
2f2dc053
SW		 2068 }
2069 }
2070}
2071
2072void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2073 struct ceph_mds_request *req)
2074{
2075 dout("submit_request on %p\n", req);
2076 mutex_lock(&mdsc->mutex);
2077 __register_request(mdsc, req, NULL);
2078 __do_request(mdsc, req);
2079 mutex_unlock(&mdsc->mutex);
2080}
2081
2082/*
2083 * Synchrously perform an mds request. Take care of all of the
2084 * session setup, forwarding, retry details.
2085 */
2086int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2087 struct inode *dir,
2088 struct ceph_mds_request *req)
2089{
2090 int err;
2091
2092 dout("do_request on %p\n", req);
2093
2094 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2095 if (req->r_inode)
2096 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2097 if (req->r_locked_dir)
2098 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
844d87c3 2099 if (req->r_old_dentry_dir)
41b02e1f
SW		 2100 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2101 CEPH_CAP_PIN);
2f2dc053
SW		 2102
2103 /* issue */
2104 mutex_lock(&mdsc->mutex);
2105 __register_request(mdsc, req, dir);
2106 __do_request(mdsc, req);
2107
e1518c7c
SW		 2108 if (req->r_err) {
2109 err = req->r_err;
2110 __unregister_request(mdsc, req);
2111 dout("do_request early error %d\n", err);
2112 goto out;
2f2dc053
SW		 2113 }
2114
e1518c7c
SW		 2115 /* wait */
2116 mutex_unlock(&mdsc->mutex);
2117 dout("do_request waiting\n");
2118 if (req->r_timeout) {
aa91647c 2119 err = (long)wait_for_completion_killable_timeout(
e1518c7c
SW		 2120 &req->r_completion, req->r_timeout);
2121 if (err == 0)
2122 err = -EIO;
2123 } else {
aa91647c 2124 err = wait_for_completion_killable(&req->r_completion);
e1518c7c
SW		 2125 }
2126 dout("do_request waited, got %d\n", err);
2127 mutex_lock(&mdsc->mutex);
5b1daecd 2128
e1518c7c
SW		 2129 /* only abort if we didn't race with a real reply */
2130 if (req->r_got_result) {
2131 err = le32_to_cpu(req->r_reply_info.head->result);
2132 } else if (err < 0) {
2133 dout("aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 2134
2135 /*
2136 * ensure we aren't running concurrently with
2137 * ceph_fill_trace or ceph_readdir_prepopulate, which
2138 * rely on locks (dir mutex) held by our caller.
2139 */
2140 mutex_lock(&req->r_fill_mutex);
e1518c7c
SW		 2141 req->r_err = err;
2142 req->r_aborted = true;
b4556396 2143 mutex_unlock(&req->r_fill_mutex);
5b1daecd 2144
e1518c7c 2145 if (req->r_locked_dir &&
167c9e35
SW		 2146 (req->r_op & CEPH_MDS_OP_WRITE))
2147 ceph_invalidate_dir_request(req);
2f2dc053 2148 } else {
e1518c7c 2149 err = req->r_err;
2f2dc053 2150 }
2f2dc053 2151
e1518c7c
SW		 2152out:
2153 mutex_unlock(&mdsc->mutex);
2f2dc053
SW		 2154 dout("do_request %p done, result %d\n", req, err);
2155 return err;
2156}
2157
167c9e35 2158/*
2f276c51 2159 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 2160 * namespace request.
2161 */
2162void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2163{
2164 struct inode *inode = req->r_locked_dir;
167c9e35 2165
2f276c51 2166 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
167c9e35 2167
2f276c51 2168 ceph_dir_clear_complete(inode);
167c9e35
SW		 2169 if (req->r_dentry)
2170 ceph_invalidate_dentry_lease(req->r_dentry);
2171 if (req->r_old_dentry)
2172 ceph_invalidate_dentry_lease(req->r_old_dentry);
2173}
2174
2f2dc053
SW		 2175/*
2176 * Handle mds reply.
2177 *
2178 * We take the session mutex and parse and process the reply immediately.
2179 * This preserves the logical ordering of replies, capabilities, etc., sent
2180 * by the MDS as they are applied to our local cache.
2181 */
2182static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2183{
2184 struct ceph_mds_client *mdsc = session->s_mdsc;
2185 struct ceph_mds_request *req;
2186 struct ceph_mds_reply_head *head = msg->front.iov_base;
2187 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2188 u64 tid;
2189 int err, result;
2600d2dd 2190 int mds = session->s_mds;
2f2dc053 2191
2f2dc053
SW		 2192 if (msg->front.iov_len < sizeof(*head)) {
2193 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
9ec7cab1 2194 ceph_msg_dump(msg);
2f2dc053
SW		 2195 return;
2196 }
2197
2198 /* get request, session */
6df058c0 2199 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2200 mutex_lock(&mdsc->mutex);
2201 req = __lookup_request(mdsc, tid);
2202 if (!req) {
2203 dout("handle_reply on unknown tid %llu\n", tid);
2204 mutex_unlock(&mdsc->mutex);
2205 return;
2206 }
2207 dout("handle_reply %p\n", req);
2f2dc053
SW		 2208
2209 /* correct session? */
d96d6049 2210 if (req->r_session != session) {
2f2dc053
SW		 2211 pr_err("mdsc_handle_reply got %llu on session mds%d"
2212 " not mds%d\n", tid, session->s_mds,
2213 req->r_session ? req->r_session->s_mds : -1);
2214 mutex_unlock(&mdsc->mutex);
2215 goto out;
2216 }
2217
2218 /* dup? */
2219 if ((req->r_got_unsafe && !head->safe) ||
2220 (req->r_got_safe && head->safe)) {
2221 pr_warning("got a dup %s reply on %llu from mds%d\n",
2222 head->safe ? "safe" : "unsafe", tid, mds);
2223 mutex_unlock(&mdsc->mutex);
2224 goto out;
2225 }
85792d0d
SW		 2226 if (req->r_got_safe && !head->safe) {
2227 pr_warning("got unsafe after safe on %llu from mds%d\n",
2228 tid, mds);
2229 mutex_unlock(&mdsc->mutex);
2230 goto out;
2231 }
2f2dc053
SW		 2232
2233 result = le32_to_cpu(head->result);
2234
2235 /*
e55b71f8
GF		 2236 * Handle an ESTALE
2237 * if we're not talking to the authority, send to them
2238 * if the authority has changed while we weren't looking,
2239 * send to new authority
2240 * Otherwise we just have to return an ESTALE
2f2dc053
SW		 2241 */
2242 if (result == -ESTALE) {
e55b71f8 2243 dout("got ESTALE on request %llu", req->r_tid);
ca18bede 2244 if (req->r_direct_mode != USE_AUTH_MDS) {
e55b71f8
GF		 2245 dout("not using auth, setting for that now");
2246 req->r_direct_mode = USE_AUTH_MDS;
2f2dc053
SW		 2247 __do_request(mdsc, req);
2248 mutex_unlock(&mdsc->mutex);
2249 goto out;
e55b71f8 2250 } else {
ca18bede
YZ		 2251 int mds = __choose_mds(mdsc, req);
2252 if (mds >= 0 && mds != req->r_session->s_mds) {
2253 dout("but auth changed, so resending");
e55b71f8
GF		 2254 __do_request(mdsc, req);
2255 mutex_unlock(&mdsc->mutex);
2256 goto out;
2257 }
2f2dc053 2258 }
e55b71f8 2259 dout("have to return ESTALE on request %llu", req->r_tid);
2f2dc053
SW		 2260 }
2261
e55b71f8 2262
2f2dc053
SW		 2263 if (head->safe) {
2264 req->r_got_safe = true;
2265 __unregister_request(mdsc, req);
2f2dc053
SW		 2266
2267 if (req->r_got_unsafe) {
2268 /*
2269 * We already handled the unsafe response, now do the
2270 * cleanup. No need to examine the response; the MDS
2271 * doesn't include any result info in the safe
2272 * response. And even if it did, there is nothing
2273 * useful we could do with a revised return value.
2274 */
2275 dout("got safe reply %llu, mds%d\n", tid, mds);
2276 list_del_init(&req->r_unsafe_item);
2277
2278 /* last unsafe request during umount? */
44ca18f2 2279 if (mdsc->stopping && !__get_oldest_req(mdsc))
03066f23 2280 complete_all(&mdsc->safe_umount_waiters);
2f2dc053
SW		 2281 mutex_unlock(&mdsc->mutex);
2282 goto out;
2283 }
e1518c7c 2284 } else {
2f2dc053
SW		 2285 req->r_got_unsafe = true;
2286 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2287 }
2288
2289 dout("handle_reply tid %lld result %d\n", tid, result);
2290 rinfo = &req->r_reply_info;
14303d20 2291 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2f2dc053
SW		 2292 mutex_unlock(&mdsc->mutex);
2293
2294 mutex_lock(&session->s_mutex);
2295 if (err < 0) {
25933abd 2296 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
9ec7cab1 2297 ceph_msg_dump(msg);
2f2dc053
SW		 2298 goto out_err;
2299 }
2300
2301 /* snap trace */
2302 if (rinfo->snapblob_len) {
2303 down_write(&mdsc->snap_rwsem);
2304 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2305 rinfo->snapblob + rinfo->snapblob_len,
2306 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
2307 downgrade_write(&mdsc->snap_rwsem);
2308 } else {
2309 down_read(&mdsc->snap_rwsem);
2310 }
2311
2312 /* insert trace into our cache */
b4556396 2313 mutex_lock(&req->r_fill_mutex);
3d14c5d2 2314 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2f2dc053 2315 if (err == 0) {
6e8575fa 2316 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 2317 req->r_op == CEPH_MDS_OP_LSSNAP))
2f2dc053 2318 ceph_readdir_prepopulate(req, req->r_session);
37151668 2319 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2f2dc053 2320 }
b4556396 2321 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 2322
2323 up_read(&mdsc->snap_rwsem);
2324out_err:
e1518c7c
SW		 2325 mutex_lock(&mdsc->mutex);
2326 if (!req->r_aborted) {
2327 if (err) {
2328 req->r_err = err;
2329 } else {
2330 req->r_reply = msg;
2331 ceph_msg_get(msg);
2332 req->r_got_result = true;
2333 }
2f2dc053 2334 } else {
e1518c7c 2335 dout("reply arrived after request %lld was aborted\n", tid);
2f2dc053 2336 }
e1518c7c 2337 mutex_unlock(&mdsc->mutex);
2f2dc053 2338
ee6b272b 2339 ceph_add_cap_releases(mdsc, req->r_session);
2f2dc053
SW		 2340 mutex_unlock(&session->s_mutex);
2341
2342 /* kick calling process */
2343 complete_request(mdsc, req);
2344out:
2345 ceph_mdsc_put_request(req);
2346 return;
2347}
2348
2349
2350
2351/*
2352 * handle mds notification that our request has been forwarded.
2353 */
2600d2dd
SW		 2354static void handle_forward(struct ceph_mds_client *mdsc,
2355 struct ceph_mds_session *session,
2356 struct ceph_msg *msg)
2f2dc053
SW		 2357{
2358 struct ceph_mds_request *req;
a1ea787c 2359 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2360 u32 next_mds;
2361 u32 fwd_seq;
2f2dc053
SW		 2362 int err = -EINVAL;
2363 void *p = msg->front.iov_base;
2364 void *end = p + msg->front.iov_len;
2f2dc053 2365
a1ea787c 2366 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 2367 next_mds = ceph_decode_32(&p);
2368 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 2369
2370 mutex_lock(&mdsc->mutex);
2371 req = __lookup_request(mdsc, tid);
2372 if (!req) {
2a8e5e36 2373 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2f2dc053
SW		 2374 goto out; /* dup reply? */
2375 }
2376
2a8e5e36
SW		 2377 if (req->r_aborted) {
2378 dout("forward tid %llu aborted, unregistering\n", tid);
2379 __unregister_request(mdsc, req);
2380 } else if (fwd_seq <= req->r_num_fwd) {
2381 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2f2dc053
SW		 2382 tid, next_mds, req->r_num_fwd, fwd_seq);
2383 } else {
2384 /* resend. forward race not possible; mds would drop */
2a8e5e36
SW		 2385 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2386 BUG_ON(req->r_err);
2387 BUG_ON(req->r_got_result);
2f2dc053
SW		 2388 req->r_num_fwd = fwd_seq;
2389 req->r_resend_mds = next_mds;
2390 put_request_session(req);
2391 __do_request(mdsc, req);
2392 }
2393 ceph_mdsc_put_request(req);
2394out:
2395 mutex_unlock(&mdsc->mutex);
2396 return;
2397
2398bad:
2399 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2400}
2401
2402/*
2403 * handle a mds session control message
2404 */
2405static void handle_session(struct ceph_mds_session *session,
2406 struct ceph_msg *msg)
2407{
2408 struct ceph_mds_client *mdsc = session->s_mdsc;
2409 u32 op;
2410 u64 seq;
2600d2dd 2411 int mds = session->s_mds;
2f2dc053
SW		 2412 struct ceph_mds_session_head *h = msg->front.iov_base;
2413 int wake = 0;
2414
2f2dc053
SW		 2415 /* decode */
2416 if (msg->front.iov_len != sizeof(*h))
2417 goto bad;
2418 op = le32_to_cpu(h->op);
2419 seq = le64_to_cpu(h->seq);
2420
2421 mutex_lock(&mdsc->mutex);
2600d2dd
SW		 2422 if (op == CEPH_SESSION_CLOSE)
2423 __unregister_session(mdsc, session);
2f2dc053
SW		 2424 /* FIXME: this ttl calculation is generous */
2425 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2426 mutex_unlock(&mdsc->mutex);
2427
2428 mutex_lock(&session->s_mutex);
2429
2430 dout("handle_session mds%d %s %p state %s seq %llu\n",
2431 mds, ceph_session_op_name(op), session,
2432 session_state_name(session->s_state), seq);
2433
2434 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2435 session->s_state = CEPH_MDS_SESSION_OPEN;
2436 pr_info("mds%d came back\n", session->s_mds);
2437 }
2438
2439 switch (op) {
2440 case CEPH_SESSION_OPEN:
29790f26
SW		 2441 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2442 pr_info("mds%d reconnect success\n", session->s_mds);
2f2dc053
SW		 2443 session->s_state = CEPH_MDS_SESSION_OPEN;
2444 renewed_caps(mdsc, session, 0);
2445 wake = 1;
2446 if (mdsc->stopping)
2447 __close_session(mdsc, session);
2448 break;
2449
2450 case CEPH_SESSION_RENEWCAPS:
2451 if (session->s_renew_seq == seq)
2452 renewed_caps(mdsc, session, 1);
2453 break;
2454
2455 case CEPH_SESSION_CLOSE:
29790f26
SW		 2456 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2457 pr_info("mds%d reconnect denied\n", session->s_mds);
2f2dc053
SW		 2458 remove_session_caps(session);
2459 wake = 1; /* for good measure */
f3c60c59 2460 wake_up_all(&mdsc->session_close_wq);
29790f26 2461 kick_requests(mdsc, mds);
2f2dc053
SW		 2462 break;
2463
2464 case CEPH_SESSION_STALE:
2465 pr_info("mds%d caps went stale, renewing\n",
2466 session->s_mds);
d8fb02ab 2467 spin_lock(&session->s_gen_ttl_lock);
2f2dc053 2468 session->s_cap_gen++;
1ce208a6 2469 session->s_cap_ttl = jiffies - 1;
d8fb02ab 2470 spin_unlock(&session->s_gen_ttl_lock);
2f2dc053
SW		 2471 send_renew_caps(mdsc, session);
2472 break;
2473
2474 case CEPH_SESSION_RECALL_STATE:
2475 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2476 break;
2477
186e4f7a
YZ		 2478 case CEPH_SESSION_FLUSHMSG:
2479 send_flushmsg_ack(mdsc, session, seq);
2480 break;
2481
2f2dc053
SW		 2482 default:
2483 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2484 WARN_ON(1);
2485 }
2486
2487 mutex_unlock(&session->s_mutex);
2488 if (wake) {
2489 mutex_lock(&mdsc->mutex);
2490 __wake_requests(mdsc, &session->s_waiting);
2491 mutex_unlock(&mdsc->mutex);
2492 }
2493 return;
2494
2495bad:
2496 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2497 (int)msg->front.iov_len);
9ec7cab1 2498 ceph_msg_dump(msg);
2f2dc053
SW		 2499 return;
2500}
2501
2502
2503/*
2504 * called under session->mutex.
2505 */
2506static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2507 struct ceph_mds_session *session)
2508{
2509 struct ceph_mds_request *req, *nreq;
2510 int err;
2511
2512 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2513
2514 mutex_lock(&mdsc->mutex);
2515 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2516 err = __prepare_send_request(mdsc, req, session->s_mds);
2517 if (!err) {
2518 ceph_msg_get(req->r_request);
2519 ceph_con_send(&session->s_con, req->r_request);
2520 }
2521 }
2522 mutex_unlock(&mdsc->mutex);
2523}
2524
2525/*
2526 * Encode information about a cap for a reconnect with the MDS.
2527 */
2f2dc053
SW		 2528static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2529 void *arg)
2530{
20cb34ae
SW		 2531 union {
2532 struct ceph_mds_cap_reconnect v2;
2533 struct ceph_mds_cap_reconnect_v1 v1;
2534 } rec;
2535 size_t reclen;
2f2dc053 2536 struct ceph_inode_info *ci;
20cb34ae
SW		 2537 struct ceph_reconnect_state *recon_state = arg;
2538 struct ceph_pagelist *pagelist = recon_state->pagelist;
2f2dc053
SW		 2539 char *path;
2540 int pathlen, err;
2541 u64 pathbase;
2542 struct dentry *dentry;
2543
2544 ci = cap->ci;
2545
2546 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2547 inode, ceph_vinop(inode), cap, cap->cap_id,
2548 ceph_cap_string(cap->issued));
93cea5be
SW		 2549 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2550 if (err)
2551 return err;
2f2dc053
SW		 2552
2553 dentry = d_find_alias(inode);
2554 if (dentry) {
2555 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2556 if (IS_ERR(path)) {
2557 err = PTR_ERR(path);
e072f8aa 2558 goto out_dput;
2f2dc053
SW		 2559 }
2560 } else {
2561 path = NULL;
2562 pathlen = 0;
2563 }
93cea5be
SW		 2564 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2565 if (err)
e072f8aa 2566 goto out_free;
2f2dc053 2567
be655596 2568 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 2569 cap->seq = 0; /* reset cap seq */
2570 cap->issue_seq = 0; /* and issue_seq */
667ca05c 2571 cap->mseq = 0; /* and migrate_seq */
99a9c273 2572 cap->cap_gen = cap->session->s_cap_gen;
20cb34ae
SW		 2573
2574 if (recon_state->flock) {
2575 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2576 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2577 rec.v2.issued = cpu_to_le32(cap->issued);
2578 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2579 rec.v2.pathbase = cpu_to_le64(pathbase);
2580 rec.v2.flock_len = 0;
2581 reclen = sizeof(rec.v2);
2582 } else {
2583 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2584 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2585 rec.v1.issued = cpu_to_le32(cap->issued);
2586 rec.v1.size = cpu_to_le64(inode->i_size);
2587 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2588 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2589 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2590 rec.v1.pathbase = cpu_to_le64(pathbase);
2591 reclen = sizeof(rec.v1);
2592 }
be655596 2593 spin_unlock(&ci->i_ceph_lock);
2f2dc053 2594
40819f6f
GF		 2595 if (recon_state->flock) {
2596 int num_fcntl_locks, num_flock_locks;
39be95e9
JS		 2597 struct ceph_filelock *flocks;
2598
2599encode_again:
1c8c601a 2600 spin_lock(&inode->i_lock);
39be95e9 2601 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
1c8c601a 2602 spin_unlock(&inode->i_lock);
39be95e9
JS		 2603 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2604 sizeof(struct ceph_filelock), GFP_NOFS);
2605 if (!flocks) {
2606 err = -ENOMEM;
2607 goto out_free;
2608 }
1c8c601a 2609 spin_lock(&inode->i_lock);
39be95e9
JS		 2610 err = ceph_encode_locks_to_buffer(inode, flocks,
2611 num_fcntl_locks,
2612 num_flock_locks);
1c8c601a 2613 spin_unlock(&inode->i_lock);
39be95e9
JS		 2614 if (err) {
2615 kfree(flocks);
2616 if (err == -ENOSPC)
2617 goto encode_again;
2618 goto out_free;
2619 }
2620 /*
2621 * number of encoded locks is stable, so copy to pagelist
2622 */
2623 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
2624 (num_fcntl_locks+num_flock_locks) *
2625 sizeof(struct ceph_filelock));
2626 err = ceph_pagelist_append(pagelist, &rec, reclen);
2627 if (!err)
2628 err = ceph_locks_to_pagelist(flocks, pagelist,
2629 num_fcntl_locks,
2630 num_flock_locks);
2631 kfree(flocks);
3612abbd
SW		 2632 } else {
2633 err = ceph_pagelist_append(pagelist, &rec, reclen);
40819f6f 2634 }
44c99757
YZ		 2635
2636 recon_state->nr_caps++;
e072f8aa 2637out_free:
2f2dc053 2638 kfree(path);
e072f8aa 2639out_dput:
2f2dc053 2640 dput(dentry);
93cea5be 2641 return err;
2f2dc053
SW		 2642}
2643
2644
2645/*
2646 * If an MDS fails and recovers, clients need to reconnect in order to
2647 * reestablish shared state. This includes all caps issued through
2648 * this session _and_ the snap_realm hierarchy. Because it's not
2649 * clear which snap realms the mds cares about, we send everything we
2650 * know about.. that ensures we'll then get any new info the
2651 * recovering MDS might have.
2652 *
2653 * This is a relatively heavyweight operation, but it's rare.
2654 *
2655 * called with mdsc->mutex held.
2656 */
34b6c855
SW		 2657static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2658 struct ceph_mds_session *session)
2f2dc053 2659{
2f2dc053 2660 struct ceph_msg *reply;
a105f00c 2661 struct rb_node *p;
34b6c855 2662 int mds = session->s_mds;
9abf82b8 2663 int err = -ENOMEM;
44c99757 2664 int s_nr_caps;
93cea5be 2665 struct ceph_pagelist *pagelist;
20cb34ae 2666 struct ceph_reconnect_state recon_state;
2f2dc053 2667
34b6c855 2668 pr_info("mds%d reconnect start\n", mds);
2f2dc053 2669
93cea5be
SW		 2670 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2671 if (!pagelist)
2672 goto fail_nopagelist;
2673 ceph_pagelist_init(pagelist);
2674
b61c2763 2675 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
a79832f2 2676 if (!reply)
93cea5be 2677 goto fail_nomsg;
93cea5be 2678
34b6c855
SW		 2679 mutex_lock(&session->s_mutex);
2680 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2681 session->s_seq = 0;
2f2dc053 2682
a53aab64 2683 ceph_con_close(&session->s_con);
34b6c855 2684 ceph_con_open(&session->s_con,
b7a9e5dd 2685 CEPH_ENTITY_TYPE_MDS, mds,
34b6c855 2686 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2f2dc053 2687
34b6c855
SW		 2688 /* replay unsafe requests */
2689 replay_unsafe_requests(mdsc, session);
2f2dc053
SW		 2690
2691 down_read(&mdsc->snap_rwsem);
2692
2f2dc053
SW		 2693 dout("session %p state %s\n", session,
2694 session_state_name(session->s_state));
2695
99a9c273
YZ		 2696 spin_lock(&session->s_gen_ttl_lock);
2697 session->s_cap_gen++;
2698 spin_unlock(&session->s_gen_ttl_lock);
2699
2700 spin_lock(&session->s_cap_lock);
2701 /*
2702 * notify __ceph_remove_cap() that we are composing cap reconnect.
2703 * If a cap get released before being added to the cap reconnect,
2704 * __ceph_remove_cap() should skip queuing cap release.
2705 */
2706 session->s_cap_reconnect = 1;
e01a5946
SW		 2707 /* drop old cap expires; we're about to reestablish that state */
2708 discard_cap_releases(mdsc, session);
99a9c273 2709 spin_unlock(&session->s_cap_lock);
e01a5946 2710
2f2dc053 2711 /* traverse this session's caps */
44c99757
YZ		 2712 s_nr_caps = session->s_nr_caps;
2713 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
93cea5be
SW		 2714 if (err)
2715 goto fail;
20cb34ae 2716
44c99757 2717 recon_state.nr_caps = 0;
20cb34ae
SW		 2718 recon_state.pagelist = pagelist;
2719 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2720 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2f2dc053 2721 if (err < 0)
9abf82b8 2722 goto fail;
2f2dc053 2723
99a9c273
YZ		 2724 spin_lock(&session->s_cap_lock);
2725 session->s_cap_reconnect = 0;
2726 spin_unlock(&session->s_cap_lock);
2727
2f2dc053
SW		 2728 /*
2729 * snaprealms. we provide mds with the ino, seq (version), and
2730 * parent for all of our realms. If the mds has any newer info,
2731 * it will tell us.
2732 */
a105f00c
SW		 2733 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2734 struct ceph_snap_realm *realm =
2735 rb_entry(p, struct ceph_snap_realm, node);
93cea5be 2736 struct ceph_mds_snaprealm_reconnect sr_rec;
2f2dc053
SW		 2737
2738 dout(" adding snap realm %llx seq %lld parent %llx\n",
2739 realm->ino, realm->seq, realm->parent_ino);
93cea5be
SW		 2740 sr_rec.ino = cpu_to_le64(realm->ino);
2741 sr_rec.seq = cpu_to_le64(realm->seq);
2742 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2743 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2744 if (err)
2745 goto fail;
2f2dc053 2746 }
2f2dc053 2747
20cb34ae
SW		 2748 if (recon_state.flock)
2749 reply->hdr.version = cpu_to_le16(2);
44c99757
YZ		 2750
2751 /* raced with cap release? */
2752 if (s_nr_caps != recon_state.nr_caps) {
2753 struct page *page = list_first_entry(&pagelist->head,
2754 struct page, lru);
2755 __le32 *addr = kmap_atomic(page);
2756 *addr = cpu_to_le32(recon_state.nr_caps);
2757 kunmap_atomic(addr);
ebf18f47 2758 }
44c99757
YZ		 2759
2760 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2761 ceph_msg_data_add_pagelist(reply, pagelist);
2f2dc053
SW		 2762 ceph_con_send(&session->s_con, reply);
2763
9abf82b8
SW		 2764 mutex_unlock(&session->s_mutex);
2765
2766 mutex_lock(&mdsc->mutex);
2767 __wake_requests(mdsc, &session->s_waiting);
2768 mutex_unlock(&mdsc->mutex);
2769
2f2dc053 2770 up_read(&mdsc->snap_rwsem);
2f2dc053
SW		 2771 return;
2772
93cea5be 2773fail:
2f2dc053 2774 ceph_msg_put(reply);
9abf82b8
SW		 2775 up_read(&mdsc->snap_rwsem);
2776 mutex_unlock(&session->s_mutex);
93cea5be
SW		 2777fail_nomsg:
2778 ceph_pagelist_release(pagelist);
2779 kfree(pagelist);
2780fail_nopagelist:
9abf82b8 2781 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
9abf82b8 2782 return;
2f2dc053
SW		 2783}
2784
2785
2786/*
2787 * compare old and new mdsmaps, kicking requests
2788 * and closing out old connections as necessary
2789 *
2790 * called under mdsc->mutex.
2791 */
2792static void check_new_map(struct ceph_mds_client *mdsc,
2793 struct ceph_mdsmap *newmap,
2794 struct ceph_mdsmap *oldmap)
2795{
2796 int i;
2797 int oldstate, newstate;
2798 struct ceph_mds_session *s;
2799
2800 dout("check_new_map new %u old %u\n",
2801 newmap->m_epoch, oldmap->m_epoch);
2802
2803 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2804 if (mdsc->sessions[i] == NULL)
2805 continue;
2806 s = mdsc->sessions[i];
2807 oldstate = ceph_mdsmap_get_state(oldmap, i);
2808 newstate = ceph_mdsmap_get_state(newmap, i);
2809
0deb01c9 2810 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2f2dc053 2811 i, ceph_mds_state_name(oldstate),
0deb01c9 2812 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2f2dc053 2813 ceph_mds_state_name(newstate),
0deb01c9 2814 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
2f2dc053
SW		 2815 session_state_name(s->s_state));
2816
3e8f43a0
YZ		 2817 if (i >= newmap->m_max_mds ||
2818 memcmp(ceph_mdsmap_get_addr(oldmap, i),
2f2dc053
SW		 2819 ceph_mdsmap_get_addr(newmap, i),
2820 sizeof(struct ceph_entity_addr))) {
2821 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2822 /* the session never opened, just close it
2823 * out now */
2824 __wake_requests(mdsc, &s->s_waiting);
2600d2dd 2825 __unregister_session(mdsc, s);
2f2dc053
SW		 2826 } else {
2827 /* just close it */
2828 mutex_unlock(&mdsc->mutex);
2829 mutex_lock(&s->s_mutex);
2830 mutex_lock(&mdsc->mutex);
2831 ceph_con_close(&s->s_con);
2832 mutex_unlock(&s->s_mutex);
2833 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2834 }
2835
2836 /* kick any requests waiting on the recovering mds */
29790f26 2837 kick_requests(mdsc, i);
2f2dc053
SW		 2838 } else if (oldstate == newstate) {
2839 continue; /* nothing new with this mds */
2840 }
2841
2842 /*
2843 * send reconnect?
2844 */
2845 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 2846 newstate >= CEPH_MDS_STATE_RECONNECT) {
2847 mutex_unlock(&mdsc->mutex);
2848 send_mds_reconnect(mdsc, s);
2849 mutex_lock(&mdsc->mutex);
2850 }
2f2dc053
SW		 2851
2852 /*
29790f26 2853 * kick request on any mds that has gone active.
2f2dc053
SW		 2854 */
2855 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
2856 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 2857 if (oldstate != CEPH_MDS_STATE_CREATING &&
2858 oldstate != CEPH_MDS_STATE_STARTING)
2859 pr_info("mds%d recovery completed\n", s->s_mds);
2860 kick_requests(mdsc, i);
2f2dc053 2861 ceph_kick_flushing_caps(mdsc, s);
0dc2570f 2862 wake_up_session_caps(s, 1);
2f2dc053
SW		 2863 }
2864 }
cb170a22
SW		 2865
2866 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
2867 s = mdsc->sessions[i];
2868 if (!s)
2869 continue;
2870 if (!ceph_mdsmap_is_laggy(newmap, i))
2871 continue;
2872 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2873 s->s_state == CEPH_MDS_SESSION_HUNG ||
2874 s->s_state == CEPH_MDS_SESSION_CLOSING) {
2875 dout(" connecting to export targets of laggy mds%d\n",
2876 i);
2877 __open_export_target_sessions(mdsc, s);
2878 }
2879 }
2f2dc053
SW		 2880}
2881
2882
2883
2884/*
2885 * leases
2886 */
2887
2888/*
2889 * caller must hold session s_mutex, dentry->d_lock
2890 */
2891void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
2892{
2893 struct ceph_dentry_info *di = ceph_dentry(dentry);
2894
2895 ceph_put_mds_session(di->lease_session);
2896 di->lease_session = NULL;
2897}
2898
2600d2dd
SW		 2899static void handle_lease(struct ceph_mds_client *mdsc,
2900 struct ceph_mds_session *session,
2901 struct ceph_msg *msg)
2f2dc053 2902{
3d14c5d2 2903 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 2904 struct inode *inode;
2f2dc053
SW		 2905 struct dentry *parent, *dentry;
2906 struct ceph_dentry_info *di;
2600d2dd 2907 int mds = session->s_mds;
2f2dc053 2908 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 2909 u32 seq;
2f2dc053 2910 struct ceph_vino vino;
2f2dc053
SW		 2911 struct qstr dname;
2912 int release = 0;
2913
2f2dc053
SW		 2914 dout("handle_lease from mds%d\n", mds);
2915
2916 /* decode */
2917 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
2918 goto bad;
2919 vino.ino = le64_to_cpu(h->ino);
2920 vino.snap = CEPH_NOSNAP;
1e5ea23d 2921 seq = le32_to_cpu(h->seq);
2f2dc053
SW		 2922 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
2923 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
2924 if (dname.len != get_unaligned_le32(h+1))
2925 goto bad;
2926
2f2dc053
SW		 2927 mutex_lock(&session->s_mutex);
2928 session->s_seq++;
2929
2930 /* lookup inode */
2931 inode = ceph_find_inode(sb, vino);
2f90b852
SW		 2932 dout("handle_lease %s, ino %llx %p %.*s\n",
2933 ceph_lease_op_name(h->action), vino.ino, inode,
1e5ea23d 2934 dname.len, dname.name);
2f2dc053
SW		 2935 if (inode == NULL) {
2936 dout("handle_lease no inode %llx\n", vino.ino);
2937 goto release;
2938 }
2f2dc053
SW		 2939
2940 /* dentry */
2941 parent = d_find_alias(inode);
2942 if (!parent) {
2943 dout("no parent dentry on inode %p\n", inode);
2944 WARN_ON(1);
2945 goto release; /* hrm... */
2946 }
2947 dname.hash = full_name_hash(dname.name, dname.len);
2948 dentry = d_lookup(parent, &dname);
2949 dput(parent);
2950 if (!dentry)
2951 goto release;
2952
2953 spin_lock(&dentry->d_lock);
2954 di = ceph_dentry(dentry);
2955 switch (h->action) {
2956 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 2957 if (di->lease_session == session) {
1e5ea23d
SW		 2958 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
2959 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 2960 __ceph_mdsc_drop_dentry_lease(dentry);
2961 }
2962 release = 1;
2963 break;
2964
2965 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 2966 if (di->lease_session == session &&
2f2dc053
SW		 2967 di->lease_gen == session->s_cap_gen &&
2968 di->lease_renew_from &&
2969 di->lease_renew_after == 0) {
2970 unsigned long duration =
2971 le32_to_cpu(h->duration_ms) * HZ / 1000;
2972
1e5ea23d 2973 di->lease_seq = seq;
2f2dc053
SW		 2974 dentry->d_time = di->lease_renew_from + duration;
2975 di->lease_renew_after = di->lease_renew_from +
2976 (duration >> 1);
2977 di->lease_renew_from = 0;
2978 }
2979 break;
2980 }
2981 spin_unlock(&dentry->d_lock);
2982 dput(dentry);
2983
2984 if (!release)
2985 goto out;
2986
2987release:
2988 /* let's just reuse the same message */
2989 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
2990 ceph_msg_get(msg);
2991 ceph_con_send(&session->s_con, msg);
2992
2993out:
2994 iput(inode);
2995 mutex_unlock(&session->s_mutex);
2f2dc053
SW		 2996 return;
2997
2998bad:
2999 pr_err("corrupt lease message\n");
9ec7cab1 3000 ceph_msg_dump(msg);
2f2dc053
SW		 3001}
3002
3003void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3004 struct inode *inode,
3005 struct dentry *dentry, char action,
3006 u32 seq)
3007{
3008 struct ceph_msg *msg;
3009 struct ceph_mds_lease *lease;
3010 int len = sizeof(*lease) + sizeof(u32);
3011 int dnamelen = 0;
3012
3013 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3014 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3015 dnamelen = dentry->d_name.len;
3016 len += dnamelen;
3017
b61c2763 3018 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 3019 if (!msg)
2f2dc053
SW		 3020 return;
3021 lease = msg->front.iov_base;
3022 lease->action = action;
2f2dc053
SW		 3023 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3024 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3025 lease->seq = cpu_to_le32(seq);
3026 put_unaligned_le32(dnamelen, lease + 1);
3027 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3028
3029 /*
3030 * if this is a preemptive lease RELEASE, no need to
3031 * flush request stream, since the actual request will
3032 * soon follow.
3033 */
3034 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3035
3036 ceph_con_send(&session->s_con, msg);
3037}
3038
3039/*
3040 * Preemptively release a lease we expect to invalidate anyway.
3041 * Pass @inode always, @dentry is optional.
3042 */
3043void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2f90b852 3044 struct dentry *dentry)
2f2dc053
SW		 3045{
3046 struct ceph_dentry_info *di;
3047 struct ceph_mds_session *session;
3048 u32 seq;
3049
3050 BUG_ON(inode == NULL);
3051 BUG_ON(dentry == NULL);
2f2dc053
SW		 3052
3053 /* is dentry lease valid? */
3054 spin_lock(&dentry->d_lock);
3055 di = ceph_dentry(dentry);
3056 if (!di || !di->lease_session ||
3057 di->lease_session->s_mds < 0 ||
3058 di->lease_gen != di->lease_session->s_cap_gen ||
3059 !time_before(jiffies, dentry->d_time)) {
3060 dout("lease_release inode %p dentry %p -- "
2f90b852
SW		 3061 "no lease\n",
3062 inode, dentry);
2f2dc053
SW		 3063 spin_unlock(&dentry->d_lock);
3064 return;
3065 }
3066
3067 /* we do have a lease on this dentry; note mds and seq */
3068 session = ceph_get_mds_session(di->lease_session);
3069 seq = di->lease_seq;
3070 __ceph_mdsc_drop_dentry_lease(dentry);
3071 spin_unlock(&dentry->d_lock);
3072
2f90b852
SW		 3073 dout("lease_release inode %p dentry %p to mds%d\n",
3074 inode, dentry, session->s_mds);
2f2dc053
SW		 3075 ceph_mdsc_lease_send_msg(session, inode, dentry,
3076 CEPH_MDS_LEASE_RELEASE, seq);
3077 ceph_put_mds_session(session);
3078}
3079
3080/*
3081 * drop all leases (and dentry refs) in preparation for umount
3082 */
3083static void drop_leases(struct ceph_mds_client *mdsc)
3084{
3085 int i;
3086
3087 dout("drop_leases\n");
3088 mutex_lock(&mdsc->mutex);
3089 for (i = 0; i < mdsc->max_sessions; i++) {
3090 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3091 if (!s)
3092 continue;
3093 mutex_unlock(&mdsc->mutex);
3094 mutex_lock(&s->s_mutex);
3095 mutex_unlock(&s->s_mutex);
3096 ceph_put_mds_session(s);
3097 mutex_lock(&mdsc->mutex);
3098 }
3099 mutex_unlock(&mdsc->mutex);
3100}
3101
3102
3103
3104/*
3105 * delayed work -- periodically trim expired leases, renew caps with mds
3106 */
3107static void schedule_delayed(struct ceph_mds_client *mdsc)
3108{
3109 int delay = 5;
3110 unsigned hz = round_jiffies_relative(HZ * delay);
3111 schedule_delayed_work(&mdsc->delayed_work, hz);
3112}
3113
3114static void delayed_work(struct work_struct *work)
3115{
3116 int i;
3117 struct ceph_mds_client *mdsc =
3118 container_of(work, struct ceph_mds_client, delayed_work.work);
3119 int renew_interval;
3120 int renew_caps;
3121
3122 dout("mdsc delayed_work\n");
afcdaea3 3123 ceph_check_delayed_caps(mdsc);
2f2dc053
SW		 3124
3125 mutex_lock(&mdsc->mutex);
3126 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3127 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3128 mdsc->last_renew_caps);
3129 if (renew_caps)
3130 mdsc->last_renew_caps = jiffies;
3131
3132 for (i = 0; i < mdsc->max_sessions; i++) {
3133 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3134 if (s == NULL)
3135 continue;
3136 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3137 dout("resending session close request for mds%d\n",
3138 s->s_mds);
3139 request_close_session(mdsc, s);
3140 ceph_put_mds_session(s);
3141 continue;
3142 }
3143 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3144 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3145 s->s_state = CEPH_MDS_SESSION_HUNG;
3146 pr_info("mds%d hung\n", s->s_mds);
3147 }
3148 }
3149 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3150 /* this mds is failed or recovering, just wait */
3151 ceph_put_mds_session(s);
3152 continue;
3153 }
3154 mutex_unlock(&mdsc->mutex);
3155
3156 mutex_lock(&s->s_mutex);
3157 if (renew_caps)
3158 send_renew_caps(mdsc, s);
3159 else
3160 ceph_con_keepalive(&s->s_con);
ee6b272b 3161 ceph_add_cap_releases(mdsc, s);
aab53dd9
SW		 3162 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3163 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 3164 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 3165 mutex_unlock(&s->s_mutex);
3166 ceph_put_mds_session(s);
3167
3168 mutex_lock(&mdsc->mutex);
3169 }
3170 mutex_unlock(&mdsc->mutex);
3171
3172 schedule_delayed(mdsc);
3173}
3174
3d14c5d2 3175int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 3176
2f2dc053 3177{
3d14c5d2
YS		 3178 struct ceph_mds_client *mdsc;
3179
3180 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3181 if (!mdsc)
3182 return -ENOMEM;
3183 mdsc->fsc = fsc;
3184 fsc->mdsc = mdsc;
2f2dc053
SW		 3185 mutex_init(&mdsc->mutex);
3186 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
fb3101b6 3187 if (mdsc->mdsmap == NULL) {
3188 kfree(mdsc);
2d06eeb8 3189 return -ENOMEM;
fb3101b6 3190 }
2d06eeb8 3191
2f2dc053 3192 init_completion(&mdsc->safe_umount_waiters);
f3c60c59 3193 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053
SW		 3194 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3195 mdsc->sessions = NULL;
3196 mdsc->max_sessions = 0;
3197 mdsc->stopping = 0;
3198 init_rwsem(&mdsc->snap_rwsem);
a105f00c 3199 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 3200 INIT_LIST_HEAD(&mdsc->snap_empty);
3201 spin_lock_init(&mdsc->snap_empty_lock);
3202 mdsc->last_tid = 0;
44ca18f2 3203 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 3204 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3205 mdsc->last_renew_caps = jiffies;
3206 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3207 spin_lock_init(&mdsc->cap_delay_lock);
3208 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3209 spin_lock_init(&mdsc->snap_flush_lock);
3210 mdsc->cap_flush_seq = 0;
3211 INIT_LIST_HEAD(&mdsc->cap_dirty);
db354052 3212 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 3213 mdsc->num_cap_flushing = 0;
3214 spin_lock_init(&mdsc->cap_dirty_lock);
3215 init_waitqueue_head(&mdsc->cap_flushing_wq);
3216 spin_lock_init(&mdsc->dentry_lru_lock);
3217 INIT_LIST_HEAD(&mdsc->dentry_lru);
2d06eeb8 3218
37151668 3219 ceph_caps_init(mdsc);
3d14c5d2 3220 ceph_adjust_min_caps(mdsc, fsc->min_caps);
37151668 3221
5f44f142 3222 return 0;
2f2dc053
SW		 3223}
3224
3225/*
3226 * Wait for safe replies on open mds requests. If we time out, drop
3227 * all requests from the tree to avoid dangling dentry refs.
3228 */
3229static void wait_requests(struct ceph_mds_client *mdsc)
3230{
3231 struct ceph_mds_request *req;
3d14c5d2 3232 struct ceph_fs_client *fsc = mdsc->fsc;
2f2dc053
SW		 3233
3234 mutex_lock(&mdsc->mutex);
44ca18f2 3235 if (__get_oldest_req(mdsc)) {
2f2dc053 3236 mutex_unlock(&mdsc->mutex);
44ca18f2 3237
2f2dc053
SW		 3238 dout("wait_requests waiting for requests\n");
3239 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3d14c5d2 3240 fsc->client->options->mount_timeout * HZ);
2f2dc053
SW		 3241
3242 /* tear down remaining requests */
44ca18f2
SW		 3243 mutex_lock(&mdsc->mutex);
3244 while ((req = __get_oldest_req(mdsc))) {
2f2dc053
SW		 3245 dout("wait_requests timed out on tid %llu\n",
3246 req->r_tid);
44ca18f2 3247 __unregister_request(mdsc, req);
2f2dc053
SW		 3248 }
3249 }
3250 mutex_unlock(&mdsc->mutex);
3251 dout("wait_requests done\n");
3252}
3253
3254/*
3255 * called before mount is ro, and before dentries are torn down.
3256 * (hmm, does this still race with new lookups?)
3257 */
3258void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3259{
3260 dout("pre_umount\n");
3261 mdsc->stopping = 1;
3262
3263 drop_leases(mdsc);
afcdaea3 3264 ceph_flush_dirty_caps(mdsc);
2f2dc053 3265 wait_requests(mdsc);
17c688c3
SW		 3266
3267 /*
3268 * wait for reply handlers to drop their request refs and
3269 * their inode/dcache refs
3270 */
3271 ceph_msgr_flush();
2f2dc053
SW		 3272}
3273
3274/*
3275 * wait for all write mds requests to flush.
3276 */
3277static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3278{
80fc7314 3279 struct ceph_mds_request *req = NULL, *nextreq;
44ca18f2 3280 struct rb_node *n;
2f2dc053
SW		 3281
3282 mutex_lock(&mdsc->mutex);
3283 dout("wait_unsafe_requests want %lld\n", want_tid);
80fc7314 3284restart:
44ca18f2
SW		 3285 req = __get_oldest_req(mdsc);
3286 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 3287 /* find next request */
3288 n = rb_next(&req->r_node);
3289 if (n)
3290 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3291 else
3292 nextreq = NULL;
44ca18f2
SW		 3293 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
3294 /* write op */
3295 ceph_mdsc_get_request(req);
80fc7314
SW		 3296 if (nextreq)
3297 ceph_mdsc_get_request(nextreq);
44ca18f2
SW		 3298 mutex_unlock(&mdsc->mutex);
3299 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3300 req->r_tid, want_tid);
3301 wait_for_completion(&req->r_safe_completion);
3302 mutex_lock(&mdsc->mutex);
44ca18f2 3303 ceph_mdsc_put_request(req);
80fc7314
SW		 3304 if (!nextreq)
3305 break; /* next dne before, so we're done! */
3306 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3307 /* next request was removed from tree */
3308 ceph_mdsc_put_request(nextreq);
3309 goto restart;
3310 }
3311 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 3312 }
80fc7314 3313 req = nextreq;
2f2dc053
SW		 3314 }
3315 mutex_unlock(&mdsc->mutex);
3316 dout("wait_unsafe_requests done\n");
3317}
3318
3319void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3320{
3321 u64 want_tid, want_flush;
3322
3d14c5d2 3323 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 3324 return;
3325
2f2dc053
SW		 3326 dout("sync\n");
3327 mutex_lock(&mdsc->mutex);
3328 want_tid = mdsc->last_tid;
3329 want_flush = mdsc->cap_flush_seq;
3330 mutex_unlock(&mdsc->mutex);
3331 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
3332
afcdaea3 3333 ceph_flush_dirty_caps(mdsc);
2f2dc053
SW		 3334
3335 wait_unsafe_requests(mdsc, want_tid);
3336 wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
3337}
3338
f3c60c59
SW		 3339/*
3340 * true if all sessions are closed, or we force unmount
3341 */
7fd7d101 3342static bool done_closing_sessions(struct ceph_mds_client *mdsc)
f3c60c59
SW		 3343{
3344 int i, n = 0;
3345
3d14c5d2 3346 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
f3c60c59
SW		 3347 return true;
3348
3349 mutex_lock(&mdsc->mutex);
3350 for (i = 0; i < mdsc->max_sessions; i++)
3351 if (mdsc->sessions[i])
3352 n++;
3353 mutex_unlock(&mdsc->mutex);
3354 return n == 0;
3355}
2f2dc053
SW		 3356
3357/*
3358 * called after sb is ro.
3359 */
3360void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3361{
3362 struct ceph_mds_session *session;
3363 int i;
3d14c5d2
YS		 3364 struct ceph_fs_client *fsc = mdsc->fsc;
3365 unsigned long timeout = fsc->client->options->mount_timeout * HZ;
2f2dc053
SW		 3366
3367 dout("close_sessions\n");
3368
2f2dc053 3369 /* close sessions */
f3c60c59
SW		 3370 mutex_lock(&mdsc->mutex);
3371 for (i = 0; i < mdsc->max_sessions; i++) {
3372 session = __ceph_lookup_mds_session(mdsc, i);
3373 if (!session)
3374 continue;
2f2dc053 3375 mutex_unlock(&mdsc->mutex);
f3c60c59
SW		 3376 mutex_lock(&session->s_mutex);
3377 __close_session(mdsc, session);
3378 mutex_unlock(&session->s_mutex);
3379 ceph_put_mds_session(session);
2f2dc053
SW		 3380 mutex_lock(&mdsc->mutex);
3381 }
f3c60c59
SW		 3382 mutex_unlock(&mdsc->mutex);
3383
3384 dout("waiting for sessions to close\n");
3385 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3386 timeout);
2f2dc053
SW		 3387
3388 /* tear down remaining sessions */
f3c60c59 3389 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 3390 for (i = 0; i < mdsc->max_sessions; i++) {
3391 if (mdsc->sessions[i]) {
3392 session = get_session(mdsc->sessions[i]);
2600d2dd 3393 __unregister_session(mdsc, session);
2f2dc053
SW		 3394 mutex_unlock(&mdsc->mutex);
3395 mutex_lock(&session->s_mutex);
3396 remove_session_caps(session);
3397 mutex_unlock(&session->s_mutex);
3398 ceph_put_mds_session(session);
3399 mutex_lock(&mdsc->mutex);
3400 }
3401 }
2f2dc053 3402 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 3403 mutex_unlock(&mdsc->mutex);
3404
3405 ceph_cleanup_empty_realms(mdsc);
3406
3407 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3408
3409 dout("stopped\n");
3410}
3411
3d14c5d2 3412static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053
SW		 3413{
3414 dout("stop\n");
3415 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3416 if (mdsc->mdsmap)
3417 ceph_mdsmap_destroy(mdsc->mdsmap);
3418 kfree(mdsc->sessions);
37151668 3419 ceph_caps_finalize(mdsc);
2f2dc053
SW		 3420}
3421
3d14c5d2
YS		 3422void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3423{
3424 struct ceph_mds_client *mdsc = fsc->mdsc;
3425
ef550f6f 3426 dout("mdsc_destroy %p\n", mdsc);
3d14c5d2 3427 ceph_mdsc_stop(mdsc);
ef550f6f
SW		 3428
3429 /* flush out any connection work with references to us */
3430 ceph_msgr_flush();
3431
3d14c5d2
YS		 3432 fsc->mdsc = NULL;
3433 kfree(mdsc);
ef550f6f 3434 dout("mdsc_destroy %p done\n", mdsc);
3d14c5d2
YS		 3435}
3436
2f2dc053
SW		 3437
3438/*
3439 * handle mds map update.
3440 */
3441void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3442{
3443 u32 epoch;
3444 u32 maplen;
3445 void *p = msg->front.iov_base;
3446 void *end = p + msg->front.iov_len;
3447 struct ceph_mdsmap *newmap, *oldmap;
3448 struct ceph_fsid fsid;
3449 int err = -EINVAL;
3450
3451 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3452 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 3453 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 3454 return;
c89136ea
SW		 3455 epoch = ceph_decode_32(&p);
3456 maplen = ceph_decode_32(&p);
2f2dc053
SW		 3457 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3458
3459 /* do we need it? */
3d14c5d2 3460 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
2f2dc053
SW		 3461 mutex_lock(&mdsc->mutex);
3462 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3463 dout("handle_map epoch %u <= our %u\n",
3464 epoch, mdsc->mdsmap->m_epoch);
3465 mutex_unlock(&mdsc->mutex);
3466 return;
3467 }
3468
3469 newmap = ceph_mdsmap_decode(&p, end);
3470 if (IS_ERR(newmap)) {
3471 err = PTR_ERR(newmap);
3472 goto bad_unlock;
3473 }
3474
3475 /* swap into place */
3476 if (mdsc->mdsmap) {
3477 oldmap = mdsc->mdsmap;
3478 mdsc->mdsmap = newmap;
3479 check_new_map(mdsc, newmap, oldmap);
3480 ceph_mdsmap_destroy(oldmap);
3481 } else {
3482 mdsc->mdsmap = newmap; /* first mds map */
3483 }
3d14c5d2 3484 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
2f2dc053
SW		 3485
3486 __wake_requests(mdsc, &mdsc->waiting_for_map);
3487
3488 mutex_unlock(&mdsc->mutex);
3489 schedule_delayed(mdsc);
3490 return;
3491
3492bad_unlock:
3493 mutex_unlock(&mdsc->mutex);
3494bad:
3495 pr_err("error decoding mdsmap %d\n", err);
3496 return;
3497}
3498
3499static struct ceph_connection *con_get(struct ceph_connection *con)
3500{
3501 struct ceph_mds_session *s = con->private;
3502
3503 if (get_session(s)) {
2600d2dd 3504 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
2f2dc053
SW		 3505 return con;
3506 }
3507 dout("mdsc con_get %p FAIL\n", s);
3508 return NULL;
3509}
3510
3511static void con_put(struct ceph_connection *con)
3512{
3513 struct ceph_mds_session *s = con->private;
3514
7d8e18a6 3515 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
2f2dc053
SW		 3516 ceph_put_mds_session(s);
3517}
3518
3519/*
3520 * if the client is unresponsive for long enough, the mds will kill
3521 * the session entirely.
3522 */
3523static void peer_reset(struct ceph_connection *con)
3524{
3525 struct ceph_mds_session *s = con->private;
7e70f0ed 3526 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 3527
7e70f0ed
SW		 3528 pr_warning("mds%d closed our session\n", s->s_mds);
3529 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 3530}
3531
3532static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3533{
3534 struct ceph_mds_session *s = con->private;
3535 struct ceph_mds_client *mdsc = s->s_mdsc;
3536 int type = le16_to_cpu(msg->hdr.type);
3537
2600d2dd
SW		 3538 mutex_lock(&mdsc->mutex);
3539 if (__verify_registered_session(mdsc, s) < 0) {
3540 mutex_unlock(&mdsc->mutex);
3541 goto out;
3542 }
3543 mutex_unlock(&mdsc->mutex);
3544
2f2dc053
SW		 3545 switch (type) {
3546 case CEPH_MSG_MDS_MAP:
3547 ceph_mdsc_handle_map(mdsc, msg);
3548 break;
3549 case CEPH_MSG_CLIENT_SESSION:
3550 handle_session(s, msg);
3551 break;
3552 case CEPH_MSG_CLIENT_REPLY:
3553 handle_reply(s, msg);
3554 break;
3555 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 3556 handle_forward(mdsc, s, msg);
2f2dc053
SW		 3557 break;
3558 case CEPH_MSG_CLIENT_CAPS:
3559 ceph_handle_caps(s, msg);
3560 break;
3561 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 3562 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 3563 break;
3564 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 3565 handle_lease(mdsc, s, msg);
2f2dc053
SW		 3566 break;
3567
3568 default:
3569 pr_err("received unknown message type %d %s\n", type,
3570 ceph_msg_type_name(type));
3571 }
2600d2dd 3572out:
2f2dc053
SW		 3573 ceph_msg_put(msg);
3574}
3575
4e7a5dcd
SW		 3576/*
3577 * authentication
3578 */
a3530df3
AE		 3579
3580/*
3581 * Note: returned pointer is the address of a structure that's
3582 * managed separately. Caller must *not* attempt to free it.
3583 */
3584static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 3585 int *proto, int force_new)
4e7a5dcd
SW		 3586{
3587 struct ceph_mds_session *s = con->private;
3588 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3589 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 3590 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 3591
74f1869f 3592 if (force_new && auth->authorizer) {
27859f97 3593 ceph_auth_destroy_authorizer(ac, auth->authorizer);
74f1869f 3594 auth->authorizer = NULL;
4e7a5dcd 3595 }
27859f97
SW		 3596 if (!auth->authorizer) {
3597 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3598 auth);
0bed9b5c
SW		 3599 if (ret)
3600 return ERR_PTR(ret);
27859f97
SW		 3601 } else {
3602 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3603 auth);
a255651d 3604 if (ret)
a3530df3 3605 return ERR_PTR(ret);
4e7a5dcd 3606 }
4e7a5dcd 3607 *proto = ac->protocol;
74f1869f 3608
a3530df3 3609 return auth;
4e7a5dcd
SW		 3610}
3611
3612
3613static int verify_authorizer_reply(struct ceph_connection *con, int len)
3614{
3615 struct ceph_mds_session *s = con->private;
3616 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3617 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4e7a5dcd 3618
27859f97 3619 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
4e7a5dcd
SW		 3620}
3621
9bd2e6f8
SW		 3622static int invalidate_authorizer(struct ceph_connection *con)
3623{
3624 struct ceph_mds_session *s = con->private;
3625 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3626 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 3627
27859f97 3628 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 3629
3d14c5d2 3630 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 3631}
3632
53ded495
AE		 3633static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3634 struct ceph_msg_header *hdr, int *skip)
3635{
3636 struct ceph_msg *msg;
3637 int type = (int) le16_to_cpu(hdr->type);
3638 int front_len = (int) le32_to_cpu(hdr->front_len);
3639
3640 if (con->in_msg)
3641 return con->in_msg;
3642
3643 *skip = 0;
3644 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3645 if (!msg) {
3646 pr_err("unable to allocate msg type %d len %d\n",
3647 type, front_len);
3648 return NULL;
3649 }
53ded495
AE		 3650
3651 return msg;
3652}
3653
9e32789f 3654static const struct ceph_connection_operations mds_con_ops = {
2f2dc053
SW		 3655 .get = con_get,
3656 .put = con_put,
3657 .dispatch = dispatch,
4e7a5dcd
SW		 3658 .get_authorizer = get_authorizer,
3659 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 3660 .invalidate_authorizer = invalidate_authorizer,
2f2dc053 3661 .peer_reset = peer_reset,
53ded495 3662 .alloc_msg = mds_alloc_msg,
2f2dc053
SW		 3663};
3664
2f2dc053 3665/* eof */
Linux kernel - Deliverables
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