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ceph: don't grabs open file reference for aborted request
[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43 * are no longer valid.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
SW		 1313 }
1314 return 0;
1315}
1316
1317/*
1318 * Allocate cap_release messages. If there is a partially full message
1319 * in the queue, try to allocate enough to cover it's remainder, so that
1320 * we can send it immediately.
1321 *
1322 * Called under s_mutex.
1323 */
2b2300d6 1324int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
ee6b272b 1325 struct ceph_mds_session *session)
2f2dc053 1326{
38e8883e 1327 struct ceph_msg *msg, *partial = NULL;
2f2dc053
SW		 1328 struct ceph_mds_cap_release *head;
1329 int err = -ENOMEM;
3d14c5d2 1330 int extra = mdsc->fsc->mount_options->cap_release_safety;
38e8883e 1331 int num;
2f2dc053 1332
38e8883e
SW		 1333 dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
1334 extra);
2f2dc053
SW		 1335
1336 spin_lock(&session->s_cap_lock);
1337
1338 if (!list_empty(&session->s_cap_releases)) {
1339 msg = list_first_entry(&session->s_cap_releases,
1340 struct ceph_msg,
1341 list_head);
1342 head = msg->front.iov_base;
38e8883e
SW		 1343 num = le32_to_cpu(head->num);
1344 if (num) {
1345 dout(" partial %p with (%d/%d)\n", msg, num,
1346 (int)CEPH_CAPS_PER_RELEASE);
1347 extra += CEPH_CAPS_PER_RELEASE - num;
1348 partial = msg;
1349 }
2f2dc053 1350 }
2f2dc053
SW		 1351 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1352 spin_unlock(&session->s_cap_lock);
34d23762 1353 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
b61c2763 1354 GFP_NOFS, false);
2f2dc053
SW		 1355 if (!msg)
1356 goto out_unlocked;
1357 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1358 (int)msg->front.iov_len);
1359 head = msg->front.iov_base;
1360 head->num = cpu_to_le32(0);
1361 msg->front.iov_len = sizeof(*head);
1362 spin_lock(&session->s_cap_lock);
1363 list_add(&msg->list_head, &session->s_cap_releases);
1364 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1365 }
1366
38e8883e
SW		 1367 if (partial) {
1368 head = partial->front.iov_base;
1369 num = le32_to_cpu(head->num);
1370 dout(" queueing partial %p with %d/%d\n", partial, num,
1371 (int)CEPH_CAPS_PER_RELEASE);
1372 list_move_tail(&partial->list_head,
1373 &session->s_cap_releases_done);
1374 session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
2f2dc053
SW		 1375 }
1376 err = 0;
1377 spin_unlock(&session->s_cap_lock);
1378out_unlocked:
1379 return err;
1380}
1381
1382/*
1383 * flush all dirty inode data to disk.
1384 *
1385 * returns true if we've flushed through want_flush_seq
1386 */
1387static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
1388{
1389 int mds, ret = 1;
1390
1391 dout("check_cap_flush want %lld\n", want_flush_seq);
1392 mutex_lock(&mdsc->mutex);
1393 for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
1394 struct ceph_mds_session *session = mdsc->sessions[mds];
1395
1396 if (!session)
1397 continue;
1398 get_session(session);
1399 mutex_unlock(&mdsc->mutex);
1400
1401 mutex_lock(&session->s_mutex);
1402 if (!list_empty(&session->s_cap_flushing)) {
1403 struct ceph_inode_info *ci =
1404 list_entry(session->s_cap_flushing.next,
1405 struct ceph_inode_info,
1406 i_flushing_item);
1407 struct inode *inode = &ci->vfs_inode;
1408
be655596 1409 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1410 if (ci->i_cap_flush_seq <= want_flush_seq) {
1411 dout("check_cap_flush still flushing %p "
1412 "seq %lld <= %lld to mds%d\n", inode,
1413 ci->i_cap_flush_seq, want_flush_seq,
1414 session->s_mds);
1415 ret = 0;
1416 }
be655596 1417 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1418 }
1419 mutex_unlock(&session->s_mutex);
1420 ceph_put_mds_session(session);
1421
1422 if (!ret)
1423 return ret;
1424 mutex_lock(&mdsc->mutex);
1425 }
1426
1427 mutex_unlock(&mdsc->mutex);
1428 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
1429 return ret;
1430}
1431
1432/*
1433 * called under s_mutex
1434 */
3d7ded4d
SW		 1435void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1436 struct ceph_mds_session *session)
2f2dc053
SW		 1437{
1438 struct ceph_msg *msg;
1439
1440 dout("send_cap_releases mds%d\n", session->s_mds);
0f8605f2
SW		 1441 spin_lock(&session->s_cap_lock);
1442 while (!list_empty(&session->s_cap_releases_done)) {
2f2dc053
SW		 1443 msg = list_first_entry(&session->s_cap_releases_done,
1444 struct ceph_msg, list_head);
1445 list_del_init(&msg->list_head);
1446 spin_unlock(&session->s_cap_lock);
1447 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1448 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1449 ceph_con_send(&session->s_con, msg);
0f8605f2 1450 spin_lock(&session->s_cap_lock);
2f2dc053
SW		 1451 }
1452 spin_unlock(&session->s_cap_lock);
1453}
1454
e01a5946
SW		 1455static void discard_cap_releases(struct ceph_mds_client *mdsc,
1456 struct ceph_mds_session *session)
1457{
1458 struct ceph_msg *msg;
1459 struct ceph_mds_cap_release *head;
1460 unsigned num;
1461
1462 dout("discard_cap_releases mds%d\n", session->s_mds);
e01a5946 1463
00bd8edb
YZ		 1464 if (!list_empty(&session->s_cap_releases)) {
1465 /* zero out the in-progress message */
1466 msg = list_first_entry(&session->s_cap_releases,
1467 struct ceph_msg, list_head);
1468 head = msg->front.iov_base;
1469 num = le32_to_cpu(head->num);
1470 dout("discard_cap_releases mds%d %p %u\n",
1471 session->s_mds, msg, num);
1472 head->num = cpu_to_le32(0);
1473 msg->front.iov_len = sizeof(*head);
1474 session->s_num_cap_releases += num;
1475 }
e01a5946
SW		 1476
1477 /* requeue completed messages */
1478 while (!list_empty(&session->s_cap_releases_done)) {
1479 msg = list_first_entry(&session->s_cap_releases_done,
1480 struct ceph_msg, list_head);
1481 list_del_init(&msg->list_head);
1482
1483 head = msg->front.iov_base;
1484 num = le32_to_cpu(head->num);
1485 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
1486 num);
1487 session->s_num_cap_releases += num;
1488 head->num = cpu_to_le32(0);
1489 msg->front.iov_len = sizeof(*head);
1490 list_add(&msg->list_head, &session->s_cap_releases);
1491 }
e01a5946
SW		 1492}
1493
2f2dc053
SW		 1494/*
1495 * requests
1496 */
1497
54008399
YZ		 1498int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1499 struct inode *dir)
1500{
1501 struct ceph_inode_info *ci = ceph_inode(dir);
1502 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1503 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1504 size_t size = sizeof(*rinfo->dir_in) + sizeof(*rinfo->dir_dname_len) +
1505 sizeof(*rinfo->dir_dname) + sizeof(*rinfo->dir_dlease);
1506 int order, num_entries;
1507
1508 spin_lock(&ci->i_ceph_lock);
1509 num_entries = ci->i_files + ci->i_subdirs;
1510 spin_unlock(&ci->i_ceph_lock);
1511 num_entries = max(num_entries, 1);
1512 num_entries = min(num_entries, opt->max_readdir);
1513
1514 order = get_order(size * num_entries);
1515 while (order >= 0) {
1516 rinfo->dir_in = (void*)__get_free_pages(GFP_NOFS | __GFP_NOWARN,
1517 order);
1518 if (rinfo->dir_in)
1519 break;
1520 order--;
1521 }
1522 if (!rinfo->dir_in)
1523 return -ENOMEM;
1524
1525 num_entries = (PAGE_SIZE << order) / size;
1526 num_entries = min(num_entries, opt->max_readdir);
1527
1528 rinfo->dir_buf_size = PAGE_SIZE << order;
1529 req->r_num_caps = num_entries + 1;
1530 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1531 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1532 return 0;
1533}
1534
2f2dc053
SW		 1535/*
1536 * Create an mds request.
1537 */
1538struct ceph_mds_request *
1539ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1540{
1541 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1542
1543 if (!req)
1544 return ERR_PTR(-ENOMEM);
1545
b4556396 1546 mutex_init(&req->r_fill_mutex);
37151668 1547 req->r_mdsc = mdsc;
2f2dc053
SW		 1548 req->r_started = jiffies;
1549 req->r_resend_mds = -1;
1550 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1551 req->r_fmode = -1;
153c8e6b 1552 kref_init(&req->r_kref);
2f2dc053
SW		 1553 INIT_LIST_HEAD(&req->r_wait);
1554 init_completion(&req->r_completion);
1555 init_completion(&req->r_safe_completion);
1556 INIT_LIST_HEAD(&req->r_unsafe_item);
1557
1558 req->r_op = op;
1559 req->r_direct_mode = mode;
1560 return req;
1561}
1562
1563/*
44ca18f2 1564 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 1565 *
1566 * called under mdsc->mutex.
1567 */
44ca18f2
SW		 1568static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1569{
1570 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1571 return NULL;
1572 return rb_entry(rb_first(&mdsc->request_tree),
1573 struct ceph_mds_request, r_node);
1574}
1575
2f2dc053
SW		 1576static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1577{
44ca18f2
SW		 1578 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1579
1580 if (req)
1581 return req->r_tid;
1582 return 0;
2f2dc053
SW		 1583}
1584
1585/*
1586 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1587 * on build_path_from_dentry in fs/cifs/dir.c.
1588 *
1589 * If @stop_on_nosnap, generate path relative to the first non-snapped
1590 * inode.
1591 *
1592 * Encode hidden .snap dirs as a double /, i.e.
1593 * foo/.snap/bar -> foo//bar
1594 */
1595char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1596 int stop_on_nosnap)
1597{
1598 struct dentry *temp;
1599 char *path;
1600 int len, pos;
1b71fe2e 1601 unsigned seq;
2f2dc053
SW		 1602
1603 if (dentry == NULL)
1604 return ERR_PTR(-EINVAL);
1605
1606retry:
1607 len = 0;
1b71fe2e
AV		 1608 seq = read_seqbegin(&rename_lock);
1609 rcu_read_lock();
2f2dc053
SW		 1610 for (temp = dentry; !IS_ROOT(temp);) {
1611 struct inode *inode = temp->d_inode;
1612 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1613 len++; /* slash only */
1614 else if (stop_on_nosnap && inode &&
1615 ceph_snap(inode) == CEPH_NOSNAP)
1616 break;
1617 else
1618 len += 1 + temp->d_name.len;
1619 temp = temp->d_parent;
2f2dc053 1620 }
1b71fe2e 1621 rcu_read_unlock();
2f2dc053
SW		 1622 if (len)
1623 len--; /* no leading '/' */
1624
1625 path = kmalloc(len+1, GFP_NOFS);
1626 if (path == NULL)
1627 return ERR_PTR(-ENOMEM);
1628 pos = len;
1629 path[pos] = 0; /* trailing null */
1b71fe2e 1630 rcu_read_lock();
2f2dc053 1631 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1b71fe2e 1632 struct inode *inode;
2f2dc053 1633
1b71fe2e
AV		 1634 spin_lock(&temp->d_lock);
1635 inode = temp->d_inode;
2f2dc053 1636 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
104648ad 1637 dout("build_path path+%d: %p SNAPDIR\n",
2f2dc053
SW		 1638 pos, temp);
1639 } else if (stop_on_nosnap && inode &&
1640 ceph_snap(inode) == CEPH_NOSNAP) {
9d5a09e6 1641 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1642 break;
1643 } else {
1644 pos -= temp->d_name.len;
1b71fe2e
AV		 1645 if (pos < 0) {
1646 spin_unlock(&temp->d_lock);
2f2dc053 1647 break;
1b71fe2e 1648 }
2f2dc053
SW		 1649 strncpy(path + pos, temp->d_name.name,
1650 temp->d_name.len);
2f2dc053 1651 }
1b71fe2e 1652 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1653 if (pos)
1654 path[--pos] = '/';
1655 temp = temp->d_parent;
2f2dc053 1656 }
1b71fe2e
AV		 1657 rcu_read_unlock();
1658 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
104648ad 1659 pr_err("build_path did not end path lookup where "
2f2dc053
SW		 1660 "expected, namelen is %d, pos is %d\n", len, pos);
1661 /* presumably this is only possible if racing with a
1662 rename of one of the parent directories (we can not
1663 lock the dentries above us to prevent this, but
1664 retrying should be harmless) */
1665 kfree(path);
1666 goto retry;
1667 }
1668
1669 *base = ceph_ino(temp->d_inode);
1670 *plen = len;
104648ad 1671 dout("build_path on %p %d built %llx '%.*s'\n",
84d08fa8 1672 dentry, d_count(dentry), *base, len, path);
2f2dc053
SW		 1673 return path;
1674}
1675
1676static int build_dentry_path(struct dentry *dentry,
1677 const char **ppath, int *ppathlen, u64 *pino,
1678 int *pfreepath)
1679{
1680 char *path;
1681
1682 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1683 *pino = ceph_ino(dentry->d_parent->d_inode);
1684 *ppath = dentry->d_name.name;
1685 *ppathlen = dentry->d_name.len;
1686 return 0;
1687 }
1688 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1689 if (IS_ERR(path))
1690 return PTR_ERR(path);
1691 *ppath = path;
1692 *pfreepath = 1;
1693 return 0;
1694}
1695
1696static int build_inode_path(struct inode *inode,
1697 const char **ppath, int *ppathlen, u64 *pino,
1698 int *pfreepath)
1699{
1700 struct dentry *dentry;
1701 char *path;
1702
1703 if (ceph_snap(inode) == CEPH_NOSNAP) {
1704 *pino = ceph_ino(inode);
1705 *ppathlen = 0;
1706 return 0;
1707 }
1708 dentry = d_find_alias(inode);
1709 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1710 dput(dentry);
1711 if (IS_ERR(path))
1712 return PTR_ERR(path);
1713 *ppath = path;
1714 *pfreepath = 1;
1715 return 0;
1716}
1717
1718/*
1719 * request arguments may be specified via an inode *, a dentry *, or
1720 * an explicit ino+path.
1721 */
1722static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1723 const char *rpath, u64 rino,
1724 const char **ppath, int *pathlen,
1725 u64 *ino, int *freepath)
1726{
1727 int r = 0;
1728
1729 if (rinode) {
1730 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1731 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1732 ceph_snap(rinode));
1733 } else if (rdentry) {
1734 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1735 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1736 *ppath);
795858db 1737 } else if (rpath || rino) {
2f2dc053
SW		 1738 *ino = rino;
1739 *ppath = rpath;
b000056a 1740 *pathlen = rpath ? strlen(rpath) : 0;
2f2dc053
SW		 1741 dout(" path %.*s\n", *pathlen, rpath);
1742 }
1743
1744 return r;
1745}
1746
1747/*
1748 * called under mdsc->mutex
1749 */
1750static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1751 struct ceph_mds_request *req,
1752 int mds)
1753{
1754 struct ceph_msg *msg;
1755 struct ceph_mds_request_head *head;
1756 const char *path1 = NULL;
1757 const char *path2 = NULL;
1758 u64 ino1 = 0, ino2 = 0;
1759 int pathlen1 = 0, pathlen2 = 0;
1760 int freepath1 = 0, freepath2 = 0;
1761 int len;
1762 u16 releases;
1763 void *p, *end;
1764 int ret;
1765
1766 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1767 req->r_path1, req->r_ino1.ino,
1768 &path1, &pathlen1, &ino1, &freepath1);
1769 if (ret < 0) {
1770 msg = ERR_PTR(ret);
1771 goto out;
1772 }
1773
1774 ret = set_request_path_attr(NULL, req->r_old_dentry,
1775 req->r_path2, req->r_ino2.ino,
1776 &path2, &pathlen2, &ino2, &freepath2);
1777 if (ret < 0) {
1778 msg = ERR_PTR(ret);
1779 goto out_free1;
1780 }
1781
1782 len = sizeof(*head) +
ac8839d7 1783 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
2f2dc053
SW		 1784
1785 /* calculate (max) length for cap releases */
1786 len += sizeof(struct ceph_mds_request_release) *
1787 (!!req->r_inode_drop + !!req->r_dentry_drop +
1788 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1789 if (req->r_dentry_drop)
1790 len += req->r_dentry->d_name.len;
1791 if (req->r_old_dentry_drop)
1792 len += req->r_old_dentry->d_name.len;
1793
b61c2763 1794 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
a79832f2
SW		 1795 if (!msg) {
1796 msg = ERR_PTR(-ENOMEM);
2f2dc053 1797 goto out_free2;
a79832f2 1798 }
2f2dc053 1799
6df058c0
SW		 1800 msg->hdr.tid = cpu_to_le64(req->r_tid);
1801
2f2dc053
SW		 1802 head = msg->front.iov_base;
1803 p = msg->front.iov_base + sizeof(*head);
1804 end = msg->front.iov_base + msg->front.iov_len;
1805
1806 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1807 head->op = cpu_to_le32(req->r_op);
ff3d0046
EB		 1808 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1809 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2f2dc053
SW		 1810 head->args = req->r_args;
1811
1812 ceph_encode_filepath(&p, end, ino1, path1);
1813 ceph_encode_filepath(&p, end, ino2, path2);
1814
e979cf50
SW		 1815 /* make note of release offset, in case we need to replay */
1816 req->r_request_release_offset = p - msg->front.iov_base;
1817
2f2dc053
SW		 1818 /* cap releases */
1819 releases = 0;
1820 if (req->r_inode_drop)
1821 releases += ceph_encode_inode_release(&p,
1822 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1823 mds, req->r_inode_drop, req->r_inode_unless, 0);
1824 if (req->r_dentry_drop)
1825 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1826 mds, req->r_dentry_drop, req->r_dentry_unless);
1827 if (req->r_old_dentry_drop)
1828 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1829 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1830 if (req->r_old_inode_drop)
1831 releases += ceph_encode_inode_release(&p,
1832 req->r_old_dentry->d_inode,
1833 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1834 head->num_releases = cpu_to_le16(releases);
1835
1836 BUG_ON(p > end);
1837 msg->front.iov_len = p - msg->front.iov_base;
1838 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1839
ebf18f47
AE		 1840 if (req->r_data_len) {
1841 /* outbound data set only by ceph_sync_setxattr() */
1842 BUG_ON(!req->r_pages);
90af3602 1843 ceph_msg_data_add_pages(msg, req->r_pages, req->r_data_len, 0);
ebf18f47 1844 }
02afca6c 1845
2f2dc053
SW		 1846 msg->hdr.data_len = cpu_to_le32(req->r_data_len);
1847 msg->hdr.data_off = cpu_to_le16(0);
1848
1849out_free2:
1850 if (freepath2)
1851 kfree((char *)path2);
1852out_free1:
1853 if (freepath1)
1854 kfree((char *)path1);
1855out:
1856 return msg;
1857}
1858
1859/*
1860 * called under mdsc->mutex if error, under no mutex if
1861 * success.
1862 */
1863static void complete_request(struct ceph_mds_client *mdsc,
1864 struct ceph_mds_request *req)
1865{
1866 if (req->r_callback)
1867 req->r_callback(mdsc, req);
1868 else
03066f23 1869 complete_all(&req->r_completion);
2f2dc053
SW		 1870}
1871
1872/*
1873 * called under mdsc->mutex
1874 */
1875static int __prepare_send_request(struct ceph_mds_client *mdsc,
1876 struct ceph_mds_request *req,
1877 int mds)
1878{
1879 struct ceph_mds_request_head *rhead;
1880 struct ceph_msg *msg;
1881 int flags = 0;
1882
2f2dc053 1883 req->r_attempts++;
e55b71f8
GF		 1884 if (req->r_inode) {
1885 struct ceph_cap *cap =
1886 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
1887
1888 if (cap)
1889 req->r_sent_on_mseq = cap->mseq;
1890 else
1891 req->r_sent_on_mseq = -1;
1892 }
2f2dc053
SW		 1893 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
1894 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
1895
01a92f17
SW		 1896 if (req->r_got_unsafe) {
1897 /*
1898 * Replay. Do not regenerate message (and rebuild
1899 * paths, etc.); just use the original message.
1900 * Rebuilding paths will break for renames because
1901 * d_move mangles the src name.
1902 */
1903 msg = req->r_request;
1904 rhead = msg->front.iov_base;
1905
1906 flags = le32_to_cpu(rhead->flags);
1907 flags |= CEPH_MDS_FLAG_REPLAY;
1908 rhead->flags = cpu_to_le32(flags);
1909
1910 if (req->r_target_inode)
1911 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
1912
1913 rhead->num_retry = req->r_attempts - 1;
e979cf50
SW		 1914
1915 /* remove cap/dentry releases from message */
1916 rhead->num_releases = 0;
1917 msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset);
1918 msg->front.iov_len = req->r_request_release_offset;
01a92f17
SW		 1919 return 0;
1920 }
1921
2f2dc053
SW		 1922 if (req->r_request) {
1923 ceph_msg_put(req->r_request);
1924 req->r_request = NULL;
1925 }
1926 msg = create_request_message(mdsc, req, mds);
1927 if (IS_ERR(msg)) {
e1518c7c 1928 req->r_err = PTR_ERR(msg);
2f2dc053 1929 complete_request(mdsc, req);
a79832f2 1930 return PTR_ERR(msg);
2f2dc053
SW		 1931 }
1932 req->r_request = msg;
1933
1934 rhead = msg->front.iov_base;
2f2dc053
SW		 1935 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
1936 if (req->r_got_unsafe)
1937 flags |= CEPH_MDS_FLAG_REPLAY;
1938 if (req->r_locked_dir)
1939 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
1940 rhead->flags = cpu_to_le32(flags);
1941 rhead->num_fwd = req->r_num_fwd;
1942 rhead->num_retry = req->r_attempts - 1;
01a92f17 1943 rhead->ino = 0;
2f2dc053
SW		 1944
1945 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2f2dc053
SW		 1946 return 0;
1947}
1948
1949/*
1950 * send request, or put it on the appropriate wait list.
1951 */
1952static int __do_request(struct ceph_mds_client *mdsc,
1953 struct ceph_mds_request *req)
1954{
1955 struct ceph_mds_session *session = NULL;
1956 int mds = -1;
1957 int err = -EAGAIN;
1958
eb1b8af3
YZ		 1959 if (req->r_err || req->r_got_result) {
1960 if (req->r_aborted)
1961 __unregister_request(mdsc, req);
2f2dc053 1962 goto out;
eb1b8af3 1963 }
2f2dc053
SW		 1964
1965 if (req->r_timeout &&
1966 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
1967 dout("do_request timed out\n");
1968 err = -EIO;
1969 goto finish;
1970 }
1971
dc69e2e9
SW		 1972 put_request_session(req);
1973
2f2dc053
SW		 1974 mds = __choose_mds(mdsc, req);
1975 if (mds < 0 ||
1976 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
1977 dout("do_request no mds or not active, waiting for map\n");
1978 list_add(&req->r_wait, &mdsc->waiting_for_map);
1979 goto out;
1980 }
1981
1982 /* get, open session */
1983 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 1984 if (!session) {
2f2dc053 1985 session = register_session(mdsc, mds);
9c423956
SW		 1986 if (IS_ERR(session)) {
1987 err = PTR_ERR(session);
1988 goto finish;
1989 }
1990 }
dc69e2e9
SW		 1991 req->r_session = get_session(session);
1992
2f2dc053
SW		 1993 dout("do_request mds%d session %p state %s\n", mds, session,
1994 session_state_name(session->s_state));
1995 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
1996 session->s_state != CEPH_MDS_SESSION_HUNG) {
1997 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1998 session->s_state == CEPH_MDS_SESSION_CLOSING)
1999 __open_session(mdsc, session);
2000 list_add(&req->r_wait, &session->s_waiting);
2001 goto out_session;
2002 }
2003
2004 /* send request */
2f2dc053
SW		 2005 req->r_resend_mds = -1; /* forget any previous mds hint */
2006
2007 if (req->r_request_started == 0) /* note request start time */
2008 req->r_request_started = jiffies;
2009
2010 err = __prepare_send_request(mdsc, req, mds);
2011 if (!err) {
2012 ceph_msg_get(req->r_request);
2013 ceph_con_send(&session->s_con, req->r_request);
2014 }
2015
2016out_session:
2017 ceph_put_mds_session(session);
2018out:
2019 return err;
2020
2021finish:
e1518c7c 2022 req->r_err = err;
2f2dc053
SW		 2023 complete_request(mdsc, req);
2024 goto out;
2025}
2026
2027/*
2028 * called under mdsc->mutex
2029 */
2030static void __wake_requests(struct ceph_mds_client *mdsc,
2031 struct list_head *head)
2032{
ed75ec2c
YZ		 2033 struct ceph_mds_request *req;
2034 LIST_HEAD(tmp_list);
2035
2036 list_splice_init(head, &tmp_list);
2f2dc053 2037
ed75ec2c
YZ		 2038 while (!list_empty(&tmp_list)) {
2039 req = list_entry(tmp_list.next,
2040 struct ceph_mds_request, r_wait);
2f2dc053 2041 list_del_init(&req->r_wait);
7971bd92 2042 dout(" wake request %p tid %llu\n", req, req->r_tid);
2f2dc053
SW		 2043 __do_request(mdsc, req);
2044 }
2045}
2046
2047/*
2048 * Wake up threads with requests pending for @mds, so that they can
29790f26 2049 * resubmit their requests to a possibly different mds.
2f2dc053 2050 */
29790f26 2051static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 2052{
44ca18f2
SW		 2053 struct ceph_mds_request *req;
2054 struct rb_node *p;
2f2dc053
SW		 2055
2056 dout("kick_requests mds%d\n", mds);
44ca18f2
SW		 2057 for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
2058 req = rb_entry(p, struct ceph_mds_request, r_node);
2059 if (req->r_got_unsafe)
2060 continue;
2061 if (req->r_session &&
2062 req->r_session->s_mds == mds) {
2063 dout(" kicking tid %llu\n", req->r_tid);
44ca18f2 2064 __do_request(mdsc, req);
2f2dc053
SW		 2065 }
2066 }
2067}
2068
2069void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2070 struct ceph_mds_request *req)
2071{
2072 dout("submit_request on %p\n", req);
2073 mutex_lock(&mdsc->mutex);
2074 __register_request(mdsc, req, NULL);
2075 __do_request(mdsc, req);
2076 mutex_unlock(&mdsc->mutex);
2077}
2078
2079/*
2080 * Synchrously perform an mds request. Take care of all of the
2081 * session setup, forwarding, retry details.
2082 */
2083int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2084 struct inode *dir,
2085 struct ceph_mds_request *req)
2086{
2087 int err;
2088
2089 dout("do_request on %p\n", req);
2090
2091 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2092 if (req->r_inode)
2093 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2094 if (req->r_locked_dir)
2095 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
844d87c3 2096 if (req->r_old_dentry_dir)
41b02e1f
SW		 2097 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2098 CEPH_CAP_PIN);
2f2dc053
SW		 2099
2100 /* issue */
2101 mutex_lock(&mdsc->mutex);
2102 __register_request(mdsc, req, dir);
2103 __do_request(mdsc, req);
2104
e1518c7c
SW		 2105 if (req->r_err) {
2106 err = req->r_err;
2107 __unregister_request(mdsc, req);
2108 dout("do_request early error %d\n", err);
2109 goto out;
2f2dc053
SW		 2110 }
2111
e1518c7c
SW		 2112 /* wait */
2113 mutex_unlock(&mdsc->mutex);
2114 dout("do_request waiting\n");
2115 if (req->r_timeout) {
aa91647c 2116 err = (long)wait_for_completion_killable_timeout(
e1518c7c
SW		 2117 &req->r_completion, req->r_timeout);
2118 if (err == 0)
2119 err = -EIO;
2120 } else {
aa91647c 2121 err = wait_for_completion_killable(&req->r_completion);
e1518c7c
SW		 2122 }
2123 dout("do_request waited, got %d\n", err);
2124 mutex_lock(&mdsc->mutex);
5b1daecd 2125
e1518c7c
SW		 2126 /* only abort if we didn't race with a real reply */
2127 if (req->r_got_result) {
2128 err = le32_to_cpu(req->r_reply_info.head->result);
2129 } else if (err < 0) {
2130 dout("aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 2131
2132 /*
2133 * ensure we aren't running concurrently with
2134 * ceph_fill_trace or ceph_readdir_prepopulate, which
2135 * rely on locks (dir mutex) held by our caller.
2136 */
2137 mutex_lock(&req->r_fill_mutex);
e1518c7c
SW		 2138 req->r_err = err;
2139 req->r_aborted = true;
b4556396 2140 mutex_unlock(&req->r_fill_mutex);
5b1daecd 2141
e1518c7c 2142 if (req->r_locked_dir &&
167c9e35
SW		 2143 (req->r_op & CEPH_MDS_OP_WRITE))
2144 ceph_invalidate_dir_request(req);
2f2dc053 2145 } else {
e1518c7c 2146 err = req->r_err;
2f2dc053 2147 }
2f2dc053 2148
e1518c7c
SW		 2149out:
2150 mutex_unlock(&mdsc->mutex);
2f2dc053
SW		 2151 dout("do_request %p done, result %d\n", req, err);
2152 return err;
2153}
2154
167c9e35 2155/*
2f276c51 2156 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 2157 * namespace request.
2158 */
2159void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2160{
2161 struct inode *inode = req->r_locked_dir;
167c9e35 2162
2f276c51 2163 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
167c9e35 2164
2f276c51 2165 ceph_dir_clear_complete(inode);
167c9e35
SW		 2166 if (req->r_dentry)
2167 ceph_invalidate_dentry_lease(req->r_dentry);
2168 if (req->r_old_dentry)
2169 ceph_invalidate_dentry_lease(req->r_old_dentry);
2170}
2171
2f2dc053
SW		 2172/*
2173 * Handle mds reply.
2174 *
2175 * We take the session mutex and parse and process the reply immediately.
2176 * This preserves the logical ordering of replies, capabilities, etc., sent
2177 * by the MDS as they are applied to our local cache.
2178 */
2179static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2180{
2181 struct ceph_mds_client *mdsc = session->s_mdsc;
2182 struct ceph_mds_request *req;
2183 struct ceph_mds_reply_head *head = msg->front.iov_base;
2184 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2185 u64 tid;
2186 int err, result;
2600d2dd 2187 int mds = session->s_mds;
2f2dc053 2188
2f2dc053
SW		 2189 if (msg->front.iov_len < sizeof(*head)) {
2190 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
9ec7cab1 2191 ceph_msg_dump(msg);
2f2dc053
SW		 2192 return;
2193 }
2194
2195 /* get request, session */
6df058c0 2196 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2197 mutex_lock(&mdsc->mutex);
2198 req = __lookup_request(mdsc, tid);
2199 if (!req) {
2200 dout("handle_reply on unknown tid %llu\n", tid);
2201 mutex_unlock(&mdsc->mutex);
2202 return;
2203 }
2204 dout("handle_reply %p\n", req);
2f2dc053
SW		 2205
2206 /* correct session? */
d96d6049 2207 if (req->r_session != session) {
2f2dc053
SW		 2208 pr_err("mdsc_handle_reply got %llu on session mds%d"
2209 " not mds%d\n", tid, session->s_mds,
2210 req->r_session ? req->r_session->s_mds : -1);
2211 mutex_unlock(&mdsc->mutex);
2212 goto out;
2213 }
2214
2215 /* dup? */
2216 if ((req->r_got_unsafe && !head->safe) ||
2217 (req->r_got_safe && head->safe)) {
2218 pr_warning("got a dup %s reply on %llu from mds%d\n",
2219 head->safe ? "safe" : "unsafe", tid, mds);
2220 mutex_unlock(&mdsc->mutex);
2221 goto out;
2222 }
85792d0d
SW		 2223 if (req->r_got_safe && !head->safe) {
2224 pr_warning("got unsafe after safe on %llu from mds%d\n",
2225 tid, mds);
2226 mutex_unlock(&mdsc->mutex);
2227 goto out;
2228 }
2f2dc053
SW		 2229
2230 result = le32_to_cpu(head->result);
2231
2232 /*
e55b71f8
GF		 2233 * Handle an ESTALE
2234 * if we're not talking to the authority, send to them
2235 * if the authority has changed while we weren't looking,
2236 * send to new authority
2237 * Otherwise we just have to return an ESTALE
2f2dc053
SW		 2238 */
2239 if (result == -ESTALE) {
e55b71f8 2240 dout("got ESTALE on request %llu", req->r_tid);
ca18bede 2241 if (req->r_direct_mode != USE_AUTH_MDS) {
e55b71f8
GF		 2242 dout("not using auth, setting for that now");
2243 req->r_direct_mode = USE_AUTH_MDS;
2f2dc053
SW		 2244 __do_request(mdsc, req);
2245 mutex_unlock(&mdsc->mutex);
2246 goto out;
e55b71f8 2247 } else {
ca18bede
YZ		 2248 int mds = __choose_mds(mdsc, req);
2249 if (mds >= 0 && mds != req->r_session->s_mds) {
2250 dout("but auth changed, so resending");
e55b71f8
GF		 2251 __do_request(mdsc, req);
2252 mutex_unlock(&mdsc->mutex);
2253 goto out;
2254 }
2f2dc053 2255 }
e55b71f8 2256 dout("have to return ESTALE on request %llu", req->r_tid);
2f2dc053
SW		 2257 }
2258
e55b71f8 2259
2f2dc053
SW		 2260 if (head->safe) {
2261 req->r_got_safe = true;
2262 __unregister_request(mdsc, req);
2f2dc053
SW		 2263
2264 if (req->r_got_unsafe) {
2265 /*
2266 * We already handled the unsafe response, now do the
2267 * cleanup. No need to examine the response; the MDS
2268 * doesn't include any result info in the safe
2269 * response. And even if it did, there is nothing
2270 * useful we could do with a revised return value.
2271 */
2272 dout("got safe reply %llu, mds%d\n", tid, mds);
2273 list_del_init(&req->r_unsafe_item);
2274
2275 /* last unsafe request during umount? */
44ca18f2 2276 if (mdsc->stopping && !__get_oldest_req(mdsc))
03066f23 2277 complete_all(&mdsc->safe_umount_waiters);
2f2dc053
SW		 2278 mutex_unlock(&mdsc->mutex);
2279 goto out;
2280 }
e1518c7c 2281 } else {
2f2dc053
SW		 2282 req->r_got_unsafe = true;
2283 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2284 }
2285
2286 dout("handle_reply tid %lld result %d\n", tid, result);
2287 rinfo = &req->r_reply_info;
14303d20 2288 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2f2dc053
SW		 2289 mutex_unlock(&mdsc->mutex);
2290
2291 mutex_lock(&session->s_mutex);
2292 if (err < 0) {
25933abd 2293 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
9ec7cab1 2294 ceph_msg_dump(msg);
2f2dc053
SW		 2295 goto out_err;
2296 }
2297
2298 /* snap trace */
2299 if (rinfo->snapblob_len) {
2300 down_write(&mdsc->snap_rwsem);
2301 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2302 rinfo->snapblob + rinfo->snapblob_len,
2303 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
2304 downgrade_write(&mdsc->snap_rwsem);
2305 } else {
2306 down_read(&mdsc->snap_rwsem);
2307 }
2308
2309 /* insert trace into our cache */
b4556396 2310 mutex_lock(&req->r_fill_mutex);
3d14c5d2 2311 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2f2dc053 2312 if (err == 0) {
6e8575fa 2313 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 2314 req->r_op == CEPH_MDS_OP_LSSNAP))
2f2dc053 2315 ceph_readdir_prepopulate(req, req->r_session);
37151668 2316 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2f2dc053 2317 }
b4556396 2318 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 2319
2320 up_read(&mdsc->snap_rwsem);
2321out_err:
e1518c7c
SW		 2322 mutex_lock(&mdsc->mutex);
2323 if (!req->r_aborted) {
2324 if (err) {
2325 req->r_err = err;
2326 } else {
2327 req->r_reply = msg;
2328 ceph_msg_get(msg);
2329 req->r_got_result = true;
2330 }
2f2dc053 2331 } else {
e1518c7c 2332 dout("reply arrived after request %lld was aborted\n", tid);
2f2dc053 2333 }
e1518c7c 2334 mutex_unlock(&mdsc->mutex);
2f2dc053 2335
ee6b272b 2336 ceph_add_cap_releases(mdsc, req->r_session);
2f2dc053
SW		 2337 mutex_unlock(&session->s_mutex);
2338
2339 /* kick calling process */
2340 complete_request(mdsc, req);
2341out:
2342 ceph_mdsc_put_request(req);
2343 return;
2344}
2345
2346
2347
2348/*
2349 * handle mds notification that our request has been forwarded.
2350 */
2600d2dd
SW		 2351static void handle_forward(struct ceph_mds_client *mdsc,
2352 struct ceph_mds_session *session,
2353 struct ceph_msg *msg)
2f2dc053
SW		 2354{
2355 struct ceph_mds_request *req;
a1ea787c 2356 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2357 u32 next_mds;
2358 u32 fwd_seq;
2f2dc053
SW		 2359 int err = -EINVAL;
2360 void *p = msg->front.iov_base;
2361 void *end = p + msg->front.iov_len;
2f2dc053 2362
a1ea787c 2363 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 2364 next_mds = ceph_decode_32(&p);
2365 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 2366
2367 mutex_lock(&mdsc->mutex);
2368 req = __lookup_request(mdsc, tid);
2369 if (!req) {
2a8e5e36 2370 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2f2dc053
SW		 2371 goto out; /* dup reply? */
2372 }
2373
2a8e5e36
SW		 2374 if (req->r_aborted) {
2375 dout("forward tid %llu aborted, unregistering\n", tid);
2376 __unregister_request(mdsc, req);
2377 } else if (fwd_seq <= req->r_num_fwd) {
2378 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2f2dc053
SW		 2379 tid, next_mds, req->r_num_fwd, fwd_seq);
2380 } else {
2381 /* resend. forward race not possible; mds would drop */
2a8e5e36
SW		 2382 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2383 BUG_ON(req->r_err);
2384 BUG_ON(req->r_got_result);
2f2dc053
SW		 2385 req->r_num_fwd = fwd_seq;
2386 req->r_resend_mds = next_mds;
2387 put_request_session(req);
2388 __do_request(mdsc, req);
2389 }
2390 ceph_mdsc_put_request(req);
2391out:
2392 mutex_unlock(&mdsc->mutex);
2393 return;
2394
2395bad:
2396 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2397}
2398
2399/*
2400 * handle a mds session control message
2401 */
2402static void handle_session(struct ceph_mds_session *session,
2403 struct ceph_msg *msg)
2404{
2405 struct ceph_mds_client *mdsc = session->s_mdsc;
2406 u32 op;
2407 u64 seq;
2600d2dd 2408 int mds = session->s_mds;
2f2dc053
SW		 2409 struct ceph_mds_session_head *h = msg->front.iov_base;
2410 int wake = 0;
2411
2f2dc053
SW		 2412 /* decode */
2413 if (msg->front.iov_len != sizeof(*h))
2414 goto bad;
2415 op = le32_to_cpu(h->op);
2416 seq = le64_to_cpu(h->seq);
2417
2418 mutex_lock(&mdsc->mutex);
2600d2dd
SW		 2419 if (op == CEPH_SESSION_CLOSE)
2420 __unregister_session(mdsc, session);
2f2dc053
SW		 2421 /* FIXME: this ttl calculation is generous */
2422 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2423 mutex_unlock(&mdsc->mutex);
2424
2425 mutex_lock(&session->s_mutex);
2426
2427 dout("handle_session mds%d %s %p state %s seq %llu\n",
2428 mds, ceph_session_op_name(op), session,
2429 session_state_name(session->s_state), seq);
2430
2431 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2432 session->s_state = CEPH_MDS_SESSION_OPEN;
2433 pr_info("mds%d came back\n", session->s_mds);
2434 }
2435
2436 switch (op) {
2437 case CEPH_SESSION_OPEN:
29790f26
SW		 2438 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2439 pr_info("mds%d reconnect success\n", session->s_mds);
2f2dc053
SW		 2440 session->s_state = CEPH_MDS_SESSION_OPEN;
2441 renewed_caps(mdsc, session, 0);
2442 wake = 1;
2443 if (mdsc->stopping)
2444 __close_session(mdsc, session);
2445 break;
2446
2447 case CEPH_SESSION_RENEWCAPS:
2448 if (session->s_renew_seq == seq)
2449 renewed_caps(mdsc, session, 1);
2450 break;
2451
2452 case CEPH_SESSION_CLOSE:
29790f26
SW		 2453 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2454 pr_info("mds%d reconnect denied\n", session->s_mds);
2f2dc053
SW		 2455 remove_session_caps(session);
2456 wake = 1; /* for good measure */
f3c60c59 2457 wake_up_all(&mdsc->session_close_wq);
29790f26 2458 kick_requests(mdsc, mds);
2f2dc053
SW		 2459 break;
2460
2461 case CEPH_SESSION_STALE:
2462 pr_info("mds%d caps went stale, renewing\n",
2463 session->s_mds);
d8fb02ab 2464 spin_lock(&session->s_gen_ttl_lock);
2f2dc053 2465 session->s_cap_gen++;
1ce208a6 2466 session->s_cap_ttl = jiffies - 1;
d8fb02ab 2467 spin_unlock(&session->s_gen_ttl_lock);
2f2dc053
SW		 2468 send_renew_caps(mdsc, session);
2469 break;
2470
2471 case CEPH_SESSION_RECALL_STATE:
2472 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2473 break;
2474
186e4f7a
YZ		 2475 case CEPH_SESSION_FLUSHMSG:
2476 send_flushmsg_ack(mdsc, session, seq);
2477 break;
2478
2f2dc053
SW		 2479 default:
2480 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2481 WARN_ON(1);
2482 }
2483
2484 mutex_unlock(&session->s_mutex);
2485 if (wake) {
2486 mutex_lock(&mdsc->mutex);
2487 __wake_requests(mdsc, &session->s_waiting);
2488 mutex_unlock(&mdsc->mutex);
2489 }
2490 return;
2491
2492bad:
2493 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2494 (int)msg->front.iov_len);
9ec7cab1 2495 ceph_msg_dump(msg);
2f2dc053
SW		 2496 return;
2497}
2498
2499
2500/*
2501 * called under session->mutex.
2502 */
2503static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2504 struct ceph_mds_session *session)
2505{
2506 struct ceph_mds_request *req, *nreq;
2507 int err;
2508
2509 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2510
2511 mutex_lock(&mdsc->mutex);
2512 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2513 err = __prepare_send_request(mdsc, req, session->s_mds);
2514 if (!err) {
2515 ceph_msg_get(req->r_request);
2516 ceph_con_send(&session->s_con, req->r_request);
2517 }
2518 }
2519 mutex_unlock(&mdsc->mutex);
2520}
2521
2522/*
2523 * Encode information about a cap for a reconnect with the MDS.
2524 */
2f2dc053
SW		 2525static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2526 void *arg)
2527{
20cb34ae
SW		 2528 union {
2529 struct ceph_mds_cap_reconnect v2;
2530 struct ceph_mds_cap_reconnect_v1 v1;
2531 } rec;
2532 size_t reclen;
2f2dc053 2533 struct ceph_inode_info *ci;
20cb34ae
SW		 2534 struct ceph_reconnect_state *recon_state = arg;
2535 struct ceph_pagelist *pagelist = recon_state->pagelist;
2f2dc053
SW		 2536 char *path;
2537 int pathlen, err;
2538 u64 pathbase;
2539 struct dentry *dentry;
2540
2541 ci = cap->ci;
2542
2543 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2544 inode, ceph_vinop(inode), cap, cap->cap_id,
2545 ceph_cap_string(cap->issued));
93cea5be
SW		 2546 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2547 if (err)
2548 return err;
2f2dc053
SW		 2549
2550 dentry = d_find_alias(inode);
2551 if (dentry) {
2552 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2553 if (IS_ERR(path)) {
2554 err = PTR_ERR(path);
e072f8aa 2555 goto out_dput;
2f2dc053
SW		 2556 }
2557 } else {
2558 path = NULL;
2559 pathlen = 0;
2560 }
93cea5be
SW		 2561 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2562 if (err)
e072f8aa 2563 goto out_free;
2f2dc053 2564
be655596 2565 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 2566 cap->seq = 0; /* reset cap seq */
2567 cap->issue_seq = 0; /* and issue_seq */
667ca05c 2568 cap->mseq = 0; /* and migrate_seq */
99a9c273 2569 cap->cap_gen = cap->session->s_cap_gen;
20cb34ae
SW		 2570
2571 if (recon_state->flock) {
2572 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2573 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2574 rec.v2.issued = cpu_to_le32(cap->issued);
2575 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2576 rec.v2.pathbase = cpu_to_le64(pathbase);
2577 rec.v2.flock_len = 0;
2578 reclen = sizeof(rec.v2);
2579 } else {
2580 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2581 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2582 rec.v1.issued = cpu_to_le32(cap->issued);
2583 rec.v1.size = cpu_to_le64(inode->i_size);
2584 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2585 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2586 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2587 rec.v1.pathbase = cpu_to_le64(pathbase);
2588 reclen = sizeof(rec.v1);
2589 }
be655596 2590 spin_unlock(&ci->i_ceph_lock);
2f2dc053 2591
40819f6f
GF		 2592 if (recon_state->flock) {
2593 int num_fcntl_locks, num_flock_locks;
39be95e9
JS		 2594 struct ceph_filelock *flocks;
2595
2596encode_again:
1c8c601a 2597 spin_lock(&inode->i_lock);
39be95e9 2598 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
1c8c601a 2599 spin_unlock(&inode->i_lock);
39be95e9
JS		 2600 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2601 sizeof(struct ceph_filelock), GFP_NOFS);
2602 if (!flocks) {
2603 err = -ENOMEM;
2604 goto out_free;
2605 }
1c8c601a 2606 spin_lock(&inode->i_lock);
39be95e9
JS		 2607 err = ceph_encode_locks_to_buffer(inode, flocks,
2608 num_fcntl_locks,
2609 num_flock_locks);
1c8c601a 2610 spin_unlock(&inode->i_lock);
39be95e9
JS		 2611 if (err) {
2612 kfree(flocks);
2613 if (err == -ENOSPC)
2614 goto encode_again;
2615 goto out_free;
2616 }
2617 /*
2618 * number of encoded locks is stable, so copy to pagelist
2619 */
2620 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
2621 (num_fcntl_locks+num_flock_locks) *
2622 sizeof(struct ceph_filelock));
2623 err = ceph_pagelist_append(pagelist, &rec, reclen);
2624 if (!err)
2625 err = ceph_locks_to_pagelist(flocks, pagelist,
2626 num_fcntl_locks,
2627 num_flock_locks);
2628 kfree(flocks);
3612abbd
SW		 2629 } else {
2630 err = ceph_pagelist_append(pagelist, &rec, reclen);
40819f6f 2631 }
44c99757
YZ		 2632
2633 recon_state->nr_caps++;
e072f8aa 2634out_free:
2f2dc053 2635 kfree(path);
e072f8aa 2636out_dput:
2f2dc053 2637 dput(dentry);
93cea5be 2638 return err;
2f2dc053
SW		 2639}
2640
2641
2642/*
2643 * If an MDS fails and recovers, clients need to reconnect in order to
2644 * reestablish shared state. This includes all caps issued through
2645 * this session _and_ the snap_realm hierarchy. Because it's not
2646 * clear which snap realms the mds cares about, we send everything we
2647 * know about.. that ensures we'll then get any new info the
2648 * recovering MDS might have.
2649 *
2650 * This is a relatively heavyweight operation, but it's rare.
2651 *
2652 * called with mdsc->mutex held.
2653 */
34b6c855
SW		 2654static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2655 struct ceph_mds_session *session)
2f2dc053 2656{
2f2dc053 2657 struct ceph_msg *reply;
a105f00c 2658 struct rb_node *p;
34b6c855 2659 int mds = session->s_mds;
9abf82b8 2660 int err = -ENOMEM;
44c99757 2661 int s_nr_caps;
93cea5be 2662 struct ceph_pagelist *pagelist;
20cb34ae 2663 struct ceph_reconnect_state recon_state;
2f2dc053 2664
34b6c855 2665 pr_info("mds%d reconnect start\n", mds);
2f2dc053 2666
93cea5be
SW		 2667 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2668 if (!pagelist)
2669 goto fail_nopagelist;
2670 ceph_pagelist_init(pagelist);
2671
b61c2763 2672 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
a79832f2 2673 if (!reply)
93cea5be 2674 goto fail_nomsg;
93cea5be 2675
34b6c855
SW		 2676 mutex_lock(&session->s_mutex);
2677 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2678 session->s_seq = 0;
2f2dc053 2679
a53aab64 2680 ceph_con_close(&session->s_con);
34b6c855 2681 ceph_con_open(&session->s_con,
b7a9e5dd 2682 CEPH_ENTITY_TYPE_MDS, mds,
34b6c855 2683 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2f2dc053 2684
34b6c855
SW		 2685 /* replay unsafe requests */
2686 replay_unsafe_requests(mdsc, session);
2f2dc053
SW		 2687
2688 down_read(&mdsc->snap_rwsem);
2689
2f2dc053
SW		 2690 dout("session %p state %s\n", session,
2691 session_state_name(session->s_state));
2692
99a9c273
YZ		 2693 spin_lock(&session->s_gen_ttl_lock);
2694 session->s_cap_gen++;
2695 spin_unlock(&session->s_gen_ttl_lock);
2696
2697 spin_lock(&session->s_cap_lock);
2698 /*
2699 * notify __ceph_remove_cap() that we are composing cap reconnect.
2700 * If a cap get released before being added to the cap reconnect,
2701 * __ceph_remove_cap() should skip queuing cap release.
2702 */
2703 session->s_cap_reconnect = 1;
e01a5946
SW		 2704 /* drop old cap expires; we're about to reestablish that state */
2705 discard_cap_releases(mdsc, session);
99a9c273 2706 spin_unlock(&session->s_cap_lock);
e01a5946 2707
2f2dc053 2708 /* traverse this session's caps */
44c99757
YZ		 2709 s_nr_caps = session->s_nr_caps;
2710 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
93cea5be
SW		 2711 if (err)
2712 goto fail;
20cb34ae 2713
44c99757 2714 recon_state.nr_caps = 0;
20cb34ae
SW		 2715 recon_state.pagelist = pagelist;
2716 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2717 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2f2dc053 2718 if (err < 0)
9abf82b8 2719 goto fail;
2f2dc053 2720
99a9c273
YZ		 2721 spin_lock(&session->s_cap_lock);
2722 session->s_cap_reconnect = 0;
2723 spin_unlock(&session->s_cap_lock);
2724
2f2dc053
SW		 2725 /*
2726 * snaprealms. we provide mds with the ino, seq (version), and
2727 * parent for all of our realms. If the mds has any newer info,
2728 * it will tell us.
2729 */
a105f00c
SW		 2730 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2731 struct ceph_snap_realm *realm =
2732 rb_entry(p, struct ceph_snap_realm, node);
93cea5be 2733 struct ceph_mds_snaprealm_reconnect sr_rec;
2f2dc053
SW		 2734
2735 dout(" adding snap realm %llx seq %lld parent %llx\n",
2736 realm->ino, realm->seq, realm->parent_ino);
93cea5be
SW		 2737 sr_rec.ino = cpu_to_le64(realm->ino);
2738 sr_rec.seq = cpu_to_le64(realm->seq);
2739 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2740 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2741 if (err)
2742 goto fail;
2f2dc053 2743 }
2f2dc053 2744
20cb34ae
SW		 2745 if (recon_state.flock)
2746 reply->hdr.version = cpu_to_le16(2);
44c99757
YZ		 2747
2748 /* raced with cap release? */
2749 if (s_nr_caps != recon_state.nr_caps) {
2750 struct page *page = list_first_entry(&pagelist->head,
2751 struct page, lru);
2752 __le32 *addr = kmap_atomic(page);
2753 *addr = cpu_to_le32(recon_state.nr_caps);
2754 kunmap_atomic(addr);
ebf18f47 2755 }
44c99757
YZ		 2756
2757 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2758 ceph_msg_data_add_pagelist(reply, pagelist);
2f2dc053
SW		 2759 ceph_con_send(&session->s_con, reply);
2760
9abf82b8
SW		 2761 mutex_unlock(&session->s_mutex);
2762
2763 mutex_lock(&mdsc->mutex);
2764 __wake_requests(mdsc, &session->s_waiting);
2765 mutex_unlock(&mdsc->mutex);
2766
2f2dc053 2767 up_read(&mdsc->snap_rwsem);
2f2dc053
SW		 2768 return;
2769
93cea5be 2770fail:
2f2dc053 2771 ceph_msg_put(reply);
9abf82b8
SW		 2772 up_read(&mdsc->snap_rwsem);
2773 mutex_unlock(&session->s_mutex);
93cea5be
SW		 2774fail_nomsg:
2775 ceph_pagelist_release(pagelist);
2776 kfree(pagelist);
2777fail_nopagelist:
9abf82b8 2778 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
9abf82b8 2779 return;
2f2dc053
SW		 2780}
2781
2782
2783/*
2784 * compare old and new mdsmaps, kicking requests
2785 * and closing out old connections as necessary
2786 *
2787 * called under mdsc->mutex.
2788 */
2789static void check_new_map(struct ceph_mds_client *mdsc,
2790 struct ceph_mdsmap *newmap,
2791 struct ceph_mdsmap *oldmap)
2792{
2793 int i;
2794 int oldstate, newstate;
2795 struct ceph_mds_session *s;
2796
2797 dout("check_new_map new %u old %u\n",
2798 newmap->m_epoch, oldmap->m_epoch);
2799
2800 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2801 if (mdsc->sessions[i] == NULL)
2802 continue;
2803 s = mdsc->sessions[i];
2804 oldstate = ceph_mdsmap_get_state(oldmap, i);
2805 newstate = ceph_mdsmap_get_state(newmap, i);
2806
0deb01c9 2807 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2f2dc053 2808 i, ceph_mds_state_name(oldstate),
0deb01c9 2809 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2f2dc053 2810 ceph_mds_state_name(newstate),
0deb01c9 2811 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
2f2dc053
SW		 2812 session_state_name(s->s_state));
2813
3e8f43a0
YZ		 2814 if (i >= newmap->m_max_mds ||
2815 memcmp(ceph_mdsmap_get_addr(oldmap, i),
2f2dc053
SW		 2816 ceph_mdsmap_get_addr(newmap, i),
2817 sizeof(struct ceph_entity_addr))) {
2818 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2819 /* the session never opened, just close it
2820 * out now */
2821 __wake_requests(mdsc, &s->s_waiting);
2600d2dd 2822 __unregister_session(mdsc, s);
2f2dc053
SW		 2823 } else {
2824 /* just close it */
2825 mutex_unlock(&mdsc->mutex);
2826 mutex_lock(&s->s_mutex);
2827 mutex_lock(&mdsc->mutex);
2828 ceph_con_close(&s->s_con);
2829 mutex_unlock(&s->s_mutex);
2830 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2831 }
2832
2833 /* kick any requests waiting on the recovering mds */
29790f26 2834 kick_requests(mdsc, i);
2f2dc053
SW		 2835 } else if (oldstate == newstate) {
2836 continue; /* nothing new with this mds */
2837 }
2838
2839 /*
2840 * send reconnect?
2841 */
2842 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 2843 newstate >= CEPH_MDS_STATE_RECONNECT) {
2844 mutex_unlock(&mdsc->mutex);
2845 send_mds_reconnect(mdsc, s);
2846 mutex_lock(&mdsc->mutex);
2847 }
2f2dc053
SW		 2848
2849 /*
29790f26 2850 * kick request on any mds that has gone active.
2f2dc053
SW		 2851 */
2852 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
2853 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 2854 if (oldstate != CEPH_MDS_STATE_CREATING &&
2855 oldstate != CEPH_MDS_STATE_STARTING)
2856 pr_info("mds%d recovery completed\n", s->s_mds);
2857 kick_requests(mdsc, i);
2f2dc053 2858 ceph_kick_flushing_caps(mdsc, s);
0dc2570f 2859 wake_up_session_caps(s, 1);
2f2dc053
SW		 2860 }
2861 }
cb170a22
SW		 2862
2863 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
2864 s = mdsc->sessions[i];
2865 if (!s)
2866 continue;
2867 if (!ceph_mdsmap_is_laggy(newmap, i))
2868 continue;
2869 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2870 s->s_state == CEPH_MDS_SESSION_HUNG ||
2871 s->s_state == CEPH_MDS_SESSION_CLOSING) {
2872 dout(" connecting to export targets of laggy mds%d\n",
2873 i);
2874 __open_export_target_sessions(mdsc, s);
2875 }
2876 }
2f2dc053
SW		 2877}
2878
2879
2880
2881/*
2882 * leases
2883 */
2884
2885/*
2886 * caller must hold session s_mutex, dentry->d_lock
2887 */
2888void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
2889{
2890 struct ceph_dentry_info *di = ceph_dentry(dentry);
2891
2892 ceph_put_mds_session(di->lease_session);
2893 di->lease_session = NULL;
2894}
2895
2600d2dd
SW		 2896static void handle_lease(struct ceph_mds_client *mdsc,
2897 struct ceph_mds_session *session,
2898 struct ceph_msg *msg)
2f2dc053 2899{
3d14c5d2 2900 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 2901 struct inode *inode;
2f2dc053
SW		 2902 struct dentry *parent, *dentry;
2903 struct ceph_dentry_info *di;
2600d2dd 2904 int mds = session->s_mds;
2f2dc053 2905 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 2906 u32 seq;
2f2dc053 2907 struct ceph_vino vino;
2f2dc053
SW		 2908 struct qstr dname;
2909 int release = 0;
2910
2f2dc053
SW		 2911 dout("handle_lease from mds%d\n", mds);
2912
2913 /* decode */
2914 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
2915 goto bad;
2916 vino.ino = le64_to_cpu(h->ino);
2917 vino.snap = CEPH_NOSNAP;
1e5ea23d 2918 seq = le32_to_cpu(h->seq);
2f2dc053
SW		 2919 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
2920 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
2921 if (dname.len != get_unaligned_le32(h+1))
2922 goto bad;
2923
2f2dc053
SW		 2924 mutex_lock(&session->s_mutex);
2925 session->s_seq++;
2926
2927 /* lookup inode */
2928 inode = ceph_find_inode(sb, vino);
2f90b852
SW		 2929 dout("handle_lease %s, ino %llx %p %.*s\n",
2930 ceph_lease_op_name(h->action), vino.ino, inode,
1e5ea23d 2931 dname.len, dname.name);
2f2dc053
SW		 2932 if (inode == NULL) {
2933 dout("handle_lease no inode %llx\n", vino.ino);
2934 goto release;
2935 }
2f2dc053
SW		 2936
2937 /* dentry */
2938 parent = d_find_alias(inode);
2939 if (!parent) {
2940 dout("no parent dentry on inode %p\n", inode);
2941 WARN_ON(1);
2942 goto release; /* hrm... */
2943 }
2944 dname.hash = full_name_hash(dname.name, dname.len);
2945 dentry = d_lookup(parent, &dname);
2946 dput(parent);
2947 if (!dentry)
2948 goto release;
2949
2950 spin_lock(&dentry->d_lock);
2951 di = ceph_dentry(dentry);
2952 switch (h->action) {
2953 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 2954 if (di->lease_session == session) {
1e5ea23d
SW		 2955 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
2956 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 2957 __ceph_mdsc_drop_dentry_lease(dentry);
2958 }
2959 release = 1;
2960 break;
2961
2962 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 2963 if (di->lease_session == session &&
2f2dc053
SW		 2964 di->lease_gen == session->s_cap_gen &&
2965 di->lease_renew_from &&
2966 di->lease_renew_after == 0) {
2967 unsigned long duration =
2968 le32_to_cpu(h->duration_ms) * HZ / 1000;
2969
1e5ea23d 2970 di->lease_seq = seq;
2f2dc053
SW		 2971 dentry->d_time = di->lease_renew_from + duration;
2972 di->lease_renew_after = di->lease_renew_from +
2973 (duration >> 1);
2974 di->lease_renew_from = 0;
2975 }
2976 break;
2977 }
2978 spin_unlock(&dentry->d_lock);
2979 dput(dentry);
2980
2981 if (!release)
2982 goto out;
2983
2984release:
2985 /* let's just reuse the same message */
2986 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
2987 ceph_msg_get(msg);
2988 ceph_con_send(&session->s_con, msg);
2989
2990out:
2991 iput(inode);
2992 mutex_unlock(&session->s_mutex);
2f2dc053
SW		 2993 return;
2994
2995bad:
2996 pr_err("corrupt lease message\n");
9ec7cab1 2997 ceph_msg_dump(msg);
2f2dc053
SW		 2998}
2999
3000void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3001 struct inode *inode,
3002 struct dentry *dentry, char action,
3003 u32 seq)
3004{
3005 struct ceph_msg *msg;
3006 struct ceph_mds_lease *lease;
3007 int len = sizeof(*lease) + sizeof(u32);
3008 int dnamelen = 0;
3009
3010 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3011 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3012 dnamelen = dentry->d_name.len;
3013 len += dnamelen;
3014
b61c2763 3015 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 3016 if (!msg)
2f2dc053
SW		 3017 return;
3018 lease = msg->front.iov_base;
3019 lease->action = action;
2f2dc053
SW		 3020 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3021 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3022 lease->seq = cpu_to_le32(seq);
3023 put_unaligned_le32(dnamelen, lease + 1);
3024 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3025
3026 /*
3027 * if this is a preemptive lease RELEASE, no need to
3028 * flush request stream, since the actual request will
3029 * soon follow.
3030 */
3031 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3032
3033 ceph_con_send(&session->s_con, msg);
3034}
3035
3036/*
3037 * Preemptively release a lease we expect to invalidate anyway.
3038 * Pass @inode always, @dentry is optional.
3039 */
3040void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2f90b852 3041 struct dentry *dentry)
2f2dc053
SW		 3042{
3043 struct ceph_dentry_info *di;
3044 struct ceph_mds_session *session;
3045 u32 seq;
3046
3047 BUG_ON(inode == NULL);
3048 BUG_ON(dentry == NULL);
2f2dc053
SW		 3049
3050 /* is dentry lease valid? */
3051 spin_lock(&dentry->d_lock);
3052 di = ceph_dentry(dentry);
3053 if (!di || !di->lease_session ||
3054 di->lease_session->s_mds < 0 ||
3055 di->lease_gen != di->lease_session->s_cap_gen ||
3056 !time_before(jiffies, dentry->d_time)) {
3057 dout("lease_release inode %p dentry %p -- "
2f90b852
SW		 3058 "no lease\n",
3059 inode, dentry);
2f2dc053
SW		 3060 spin_unlock(&dentry->d_lock);
3061 return;
3062 }
3063
3064 /* we do have a lease on this dentry; note mds and seq */
3065 session = ceph_get_mds_session(di->lease_session);
3066 seq = di->lease_seq;
3067 __ceph_mdsc_drop_dentry_lease(dentry);
3068 spin_unlock(&dentry->d_lock);
3069
2f90b852
SW		 3070 dout("lease_release inode %p dentry %p to mds%d\n",
3071 inode, dentry, session->s_mds);
2f2dc053
SW		 3072 ceph_mdsc_lease_send_msg(session, inode, dentry,
3073 CEPH_MDS_LEASE_RELEASE, seq);
3074 ceph_put_mds_session(session);
3075}
3076
3077/*
3078 * drop all leases (and dentry refs) in preparation for umount
3079 */
3080static void drop_leases(struct ceph_mds_client *mdsc)
3081{
3082 int i;
3083
3084 dout("drop_leases\n");
3085 mutex_lock(&mdsc->mutex);
3086 for (i = 0; i < mdsc->max_sessions; i++) {
3087 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3088 if (!s)
3089 continue;
3090 mutex_unlock(&mdsc->mutex);
3091 mutex_lock(&s->s_mutex);
3092 mutex_unlock(&s->s_mutex);
3093 ceph_put_mds_session(s);
3094 mutex_lock(&mdsc->mutex);
3095 }
3096 mutex_unlock(&mdsc->mutex);
3097}
3098
3099
3100
3101/*
3102 * delayed work -- periodically trim expired leases, renew caps with mds
3103 */
3104static void schedule_delayed(struct ceph_mds_client *mdsc)
3105{
3106 int delay = 5;
3107 unsigned hz = round_jiffies_relative(HZ * delay);
3108 schedule_delayed_work(&mdsc->delayed_work, hz);
3109}
3110
3111static void delayed_work(struct work_struct *work)
3112{
3113 int i;
3114 struct ceph_mds_client *mdsc =
3115 container_of(work, struct ceph_mds_client, delayed_work.work);
3116 int renew_interval;
3117 int renew_caps;
3118
3119 dout("mdsc delayed_work\n");
afcdaea3 3120 ceph_check_delayed_caps(mdsc);
2f2dc053
SW		 3121
3122 mutex_lock(&mdsc->mutex);
3123 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3124 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3125 mdsc->last_renew_caps);
3126 if (renew_caps)
3127 mdsc->last_renew_caps = jiffies;
3128
3129 for (i = 0; i < mdsc->max_sessions; i++) {
3130 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3131 if (s == NULL)
3132 continue;
3133 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3134 dout("resending session close request for mds%d\n",
3135 s->s_mds);
3136 request_close_session(mdsc, s);
3137 ceph_put_mds_session(s);
3138 continue;
3139 }
3140 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3141 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3142 s->s_state = CEPH_MDS_SESSION_HUNG;
3143 pr_info("mds%d hung\n", s->s_mds);
3144 }
3145 }
3146 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3147 /* this mds is failed or recovering, just wait */
3148 ceph_put_mds_session(s);
3149 continue;
3150 }
3151 mutex_unlock(&mdsc->mutex);
3152
3153 mutex_lock(&s->s_mutex);
3154 if (renew_caps)
3155 send_renew_caps(mdsc, s);
3156 else
3157 ceph_con_keepalive(&s->s_con);
ee6b272b 3158 ceph_add_cap_releases(mdsc, s);
aab53dd9
SW		 3159 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3160 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 3161 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 3162 mutex_unlock(&s->s_mutex);
3163 ceph_put_mds_session(s);
3164
3165 mutex_lock(&mdsc->mutex);
3166 }
3167 mutex_unlock(&mdsc->mutex);
3168
3169 schedule_delayed(mdsc);
3170}
3171
3d14c5d2 3172int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 3173
2f2dc053 3174{
3d14c5d2
YS		 3175 struct ceph_mds_client *mdsc;
3176
3177 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3178 if (!mdsc)
3179 return -ENOMEM;
3180 mdsc->fsc = fsc;
3181 fsc->mdsc = mdsc;
2f2dc053
SW		 3182 mutex_init(&mdsc->mutex);
3183 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
fb3101b6 3184 if (mdsc->mdsmap == NULL) {
3185 kfree(mdsc);
2d06eeb8 3186 return -ENOMEM;
fb3101b6 3187 }
2d06eeb8 3188
2f2dc053 3189 init_completion(&mdsc->safe_umount_waiters);
f3c60c59 3190 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053
SW		 3191 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3192 mdsc->sessions = NULL;
3193 mdsc->max_sessions = 0;
3194 mdsc->stopping = 0;
3195 init_rwsem(&mdsc->snap_rwsem);
a105f00c 3196 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 3197 INIT_LIST_HEAD(&mdsc->snap_empty);
3198 spin_lock_init(&mdsc->snap_empty_lock);
3199 mdsc->last_tid = 0;
44ca18f2 3200 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 3201 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3202 mdsc->last_renew_caps = jiffies;
3203 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3204 spin_lock_init(&mdsc->cap_delay_lock);
3205 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3206 spin_lock_init(&mdsc->snap_flush_lock);
3207 mdsc->cap_flush_seq = 0;
3208 INIT_LIST_HEAD(&mdsc->cap_dirty);
db354052 3209 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 3210 mdsc->num_cap_flushing = 0;
3211 spin_lock_init(&mdsc->cap_dirty_lock);
3212 init_waitqueue_head(&mdsc->cap_flushing_wq);
3213 spin_lock_init(&mdsc->dentry_lru_lock);
3214 INIT_LIST_HEAD(&mdsc->dentry_lru);
2d06eeb8 3215
37151668 3216 ceph_caps_init(mdsc);
3d14c5d2 3217 ceph_adjust_min_caps(mdsc, fsc->min_caps);
37151668 3218
5f44f142 3219 return 0;
2f2dc053
SW		 3220}
3221
3222/*
3223 * Wait for safe replies on open mds requests. If we time out, drop
3224 * all requests from the tree to avoid dangling dentry refs.
3225 */
3226static void wait_requests(struct ceph_mds_client *mdsc)
3227{
3228 struct ceph_mds_request *req;
3d14c5d2 3229 struct ceph_fs_client *fsc = mdsc->fsc;
2f2dc053
SW		 3230
3231 mutex_lock(&mdsc->mutex);
44ca18f2 3232 if (__get_oldest_req(mdsc)) {
2f2dc053 3233 mutex_unlock(&mdsc->mutex);
44ca18f2 3234
2f2dc053
SW		 3235 dout("wait_requests waiting for requests\n");
3236 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3d14c5d2 3237 fsc->client->options->mount_timeout * HZ);
2f2dc053
SW		 3238
3239 /* tear down remaining requests */
44ca18f2
SW		 3240 mutex_lock(&mdsc->mutex);
3241 while ((req = __get_oldest_req(mdsc))) {
2f2dc053
SW		 3242 dout("wait_requests timed out on tid %llu\n",
3243 req->r_tid);
44ca18f2 3244 __unregister_request(mdsc, req);
2f2dc053
SW		 3245 }
3246 }
3247 mutex_unlock(&mdsc->mutex);
3248 dout("wait_requests done\n");
3249}
3250
3251/*
3252 * called before mount is ro, and before dentries are torn down.
3253 * (hmm, does this still race with new lookups?)
3254 */
3255void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3256{
3257 dout("pre_umount\n");
3258 mdsc->stopping = 1;
3259
3260 drop_leases(mdsc);
afcdaea3 3261 ceph_flush_dirty_caps(mdsc);
2f2dc053 3262 wait_requests(mdsc);
17c688c3
SW		 3263
3264 /*
3265 * wait for reply handlers to drop their request refs and
3266 * their inode/dcache refs
3267 */
3268 ceph_msgr_flush();
2f2dc053
SW		 3269}
3270
3271/*
3272 * wait for all write mds requests to flush.
3273 */
3274static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3275{
80fc7314 3276 struct ceph_mds_request *req = NULL, *nextreq;
44ca18f2 3277 struct rb_node *n;
2f2dc053
SW		 3278
3279 mutex_lock(&mdsc->mutex);
3280 dout("wait_unsafe_requests want %lld\n", want_tid);
80fc7314 3281restart:
44ca18f2
SW		 3282 req = __get_oldest_req(mdsc);
3283 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 3284 /* find next request */
3285 n = rb_next(&req->r_node);
3286 if (n)
3287 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3288 else
3289 nextreq = NULL;
44ca18f2
SW		 3290 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
3291 /* write op */
3292 ceph_mdsc_get_request(req);
80fc7314
SW		 3293 if (nextreq)
3294 ceph_mdsc_get_request(nextreq);
44ca18f2
SW		 3295 mutex_unlock(&mdsc->mutex);
3296 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3297 req->r_tid, want_tid);
3298 wait_for_completion(&req->r_safe_completion);
3299 mutex_lock(&mdsc->mutex);
44ca18f2 3300 ceph_mdsc_put_request(req);
80fc7314
SW		 3301 if (!nextreq)
3302 break; /* next dne before, so we're done! */
3303 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3304 /* next request was removed from tree */
3305 ceph_mdsc_put_request(nextreq);
3306 goto restart;
3307 }
3308 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 3309 }
80fc7314 3310 req = nextreq;
2f2dc053
SW		 3311 }
3312 mutex_unlock(&mdsc->mutex);
3313 dout("wait_unsafe_requests done\n");
3314}
3315
3316void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3317{
3318 u64 want_tid, want_flush;
3319
3d14c5d2 3320 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 3321 return;
3322
2f2dc053
SW		 3323 dout("sync\n");
3324 mutex_lock(&mdsc->mutex);
3325 want_tid = mdsc->last_tid;
3326 want_flush = mdsc->cap_flush_seq;
3327 mutex_unlock(&mdsc->mutex);
3328 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
3329
afcdaea3 3330 ceph_flush_dirty_caps(mdsc);
2f2dc053
SW		 3331
3332 wait_unsafe_requests(mdsc, want_tid);
3333 wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
3334}
3335
f3c60c59
SW		 3336/*
3337 * true if all sessions are closed, or we force unmount
3338 */
7fd7d101 3339static bool done_closing_sessions(struct ceph_mds_client *mdsc)
f3c60c59
SW		 3340{
3341 int i, n = 0;
3342
3d14c5d2 3343 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
f3c60c59
SW		 3344 return true;
3345
3346 mutex_lock(&mdsc->mutex);
3347 for (i = 0; i < mdsc->max_sessions; i++)
3348 if (mdsc->sessions[i])
3349 n++;
3350 mutex_unlock(&mdsc->mutex);
3351 return n == 0;
3352}
2f2dc053
SW		 3353
3354/*
3355 * called after sb is ro.
3356 */
3357void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3358{
3359 struct ceph_mds_session *session;
3360 int i;
3d14c5d2
YS		 3361 struct ceph_fs_client *fsc = mdsc->fsc;
3362 unsigned long timeout = fsc->client->options->mount_timeout * HZ;
2f2dc053
SW		 3363
3364 dout("close_sessions\n");
3365
2f2dc053 3366 /* close sessions */
f3c60c59
SW		 3367 mutex_lock(&mdsc->mutex);
3368 for (i = 0; i < mdsc->max_sessions; i++) {
3369 session = __ceph_lookup_mds_session(mdsc, i);
3370 if (!session)
3371 continue;
2f2dc053 3372 mutex_unlock(&mdsc->mutex);
f3c60c59
SW		 3373 mutex_lock(&session->s_mutex);
3374 __close_session(mdsc, session);
3375 mutex_unlock(&session->s_mutex);
3376 ceph_put_mds_session(session);
2f2dc053
SW		 3377 mutex_lock(&mdsc->mutex);
3378 }
f3c60c59
SW		 3379 mutex_unlock(&mdsc->mutex);
3380
3381 dout("waiting for sessions to close\n");
3382 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3383 timeout);
2f2dc053
SW		 3384
3385 /* tear down remaining sessions */
f3c60c59 3386 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 3387 for (i = 0; i < mdsc->max_sessions; i++) {
3388 if (mdsc->sessions[i]) {
3389 session = get_session(mdsc->sessions[i]);
2600d2dd 3390 __unregister_session(mdsc, session);
2f2dc053
SW		 3391 mutex_unlock(&mdsc->mutex);
3392 mutex_lock(&session->s_mutex);
3393 remove_session_caps(session);
3394 mutex_unlock(&session->s_mutex);
3395 ceph_put_mds_session(session);
3396 mutex_lock(&mdsc->mutex);
3397 }
3398 }
2f2dc053 3399 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 3400 mutex_unlock(&mdsc->mutex);
3401
3402 ceph_cleanup_empty_realms(mdsc);
3403
3404 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3405
3406 dout("stopped\n");
3407}
3408
3d14c5d2 3409static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053
SW		 3410{
3411 dout("stop\n");
3412 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3413 if (mdsc->mdsmap)
3414 ceph_mdsmap_destroy(mdsc->mdsmap);
3415 kfree(mdsc->sessions);
37151668 3416 ceph_caps_finalize(mdsc);
2f2dc053
SW		 3417}
3418
3d14c5d2
YS		 3419void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3420{
3421 struct ceph_mds_client *mdsc = fsc->mdsc;
3422
ef550f6f 3423 dout("mdsc_destroy %p\n", mdsc);
3d14c5d2 3424 ceph_mdsc_stop(mdsc);
ef550f6f
SW		 3425
3426 /* flush out any connection work with references to us */
3427 ceph_msgr_flush();
3428
3d14c5d2
YS		 3429 fsc->mdsc = NULL;
3430 kfree(mdsc);
ef550f6f 3431 dout("mdsc_destroy %p done\n", mdsc);
3d14c5d2
YS		 3432}
3433
2f2dc053
SW		 3434
3435/*
3436 * handle mds map update.
3437 */
3438void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3439{
3440 u32 epoch;
3441 u32 maplen;
3442 void *p = msg->front.iov_base;
3443 void *end = p + msg->front.iov_len;
3444 struct ceph_mdsmap *newmap, *oldmap;
3445 struct ceph_fsid fsid;
3446 int err = -EINVAL;
3447
3448 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3449 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 3450 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 3451 return;
c89136ea
SW		 3452 epoch = ceph_decode_32(&p);
3453 maplen = ceph_decode_32(&p);
2f2dc053
SW		 3454 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3455
3456 /* do we need it? */
3d14c5d2 3457 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
2f2dc053
SW		 3458 mutex_lock(&mdsc->mutex);
3459 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3460 dout("handle_map epoch %u <= our %u\n",
3461 epoch, mdsc->mdsmap->m_epoch);
3462 mutex_unlock(&mdsc->mutex);
3463 return;
3464 }
3465
3466 newmap = ceph_mdsmap_decode(&p, end);
3467 if (IS_ERR(newmap)) {
3468 err = PTR_ERR(newmap);
3469 goto bad_unlock;
3470 }
3471
3472 /* swap into place */
3473 if (mdsc->mdsmap) {
3474 oldmap = mdsc->mdsmap;
3475 mdsc->mdsmap = newmap;
3476 check_new_map(mdsc, newmap, oldmap);
3477 ceph_mdsmap_destroy(oldmap);
3478 } else {
3479 mdsc->mdsmap = newmap; /* first mds map */
3480 }
3d14c5d2 3481 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
2f2dc053
SW		 3482
3483 __wake_requests(mdsc, &mdsc->waiting_for_map);
3484
3485 mutex_unlock(&mdsc->mutex);
3486 schedule_delayed(mdsc);
3487 return;
3488
3489bad_unlock:
3490 mutex_unlock(&mdsc->mutex);
3491bad:
3492 pr_err("error decoding mdsmap %d\n", err);
3493 return;
3494}
3495
3496static struct ceph_connection *con_get(struct ceph_connection *con)
3497{
3498 struct ceph_mds_session *s = con->private;
3499
3500 if (get_session(s)) {
2600d2dd 3501 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
2f2dc053
SW		 3502 return con;
3503 }
3504 dout("mdsc con_get %p FAIL\n", s);
3505 return NULL;
3506}
3507
3508static void con_put(struct ceph_connection *con)
3509{
3510 struct ceph_mds_session *s = con->private;
3511
7d8e18a6 3512 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
2f2dc053
SW		 3513 ceph_put_mds_session(s);
3514}
3515
3516/*
3517 * if the client is unresponsive for long enough, the mds will kill
3518 * the session entirely.
3519 */
3520static void peer_reset(struct ceph_connection *con)
3521{
3522 struct ceph_mds_session *s = con->private;
7e70f0ed 3523 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 3524
7e70f0ed
SW		 3525 pr_warning("mds%d closed our session\n", s->s_mds);
3526 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 3527}
3528
3529static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3530{
3531 struct ceph_mds_session *s = con->private;
3532 struct ceph_mds_client *mdsc = s->s_mdsc;
3533 int type = le16_to_cpu(msg->hdr.type);
3534
2600d2dd
SW		 3535 mutex_lock(&mdsc->mutex);
3536 if (__verify_registered_session(mdsc, s) < 0) {
3537 mutex_unlock(&mdsc->mutex);
3538 goto out;
3539 }
3540 mutex_unlock(&mdsc->mutex);
3541
2f2dc053
SW		 3542 switch (type) {
3543 case CEPH_MSG_MDS_MAP:
3544 ceph_mdsc_handle_map(mdsc, msg);
3545 break;
3546 case CEPH_MSG_CLIENT_SESSION:
3547 handle_session(s, msg);
3548 break;
3549 case CEPH_MSG_CLIENT_REPLY:
3550 handle_reply(s, msg);
3551 break;
3552 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 3553 handle_forward(mdsc, s, msg);
2f2dc053
SW		 3554 break;
3555 case CEPH_MSG_CLIENT_CAPS:
3556 ceph_handle_caps(s, msg);
3557 break;
3558 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 3559 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 3560 break;
3561 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 3562 handle_lease(mdsc, s, msg);
2f2dc053
SW		 3563 break;
3564
3565 default:
3566 pr_err("received unknown message type %d %s\n", type,
3567 ceph_msg_type_name(type));
3568 }
2600d2dd 3569out:
2f2dc053
SW		 3570 ceph_msg_put(msg);
3571}
3572
4e7a5dcd
SW		 3573/*
3574 * authentication
3575 */
a3530df3
AE		 3576
3577/*
3578 * Note: returned pointer is the address of a structure that's
3579 * managed separately. Caller must *not* attempt to free it.
3580 */
3581static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 3582 int *proto, int force_new)
4e7a5dcd
SW		 3583{
3584 struct ceph_mds_session *s = con->private;
3585 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3586 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 3587 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 3588
74f1869f 3589 if (force_new && auth->authorizer) {
27859f97 3590 ceph_auth_destroy_authorizer(ac, auth->authorizer);
74f1869f 3591 auth->authorizer = NULL;
4e7a5dcd 3592 }
27859f97
SW		 3593 if (!auth->authorizer) {
3594 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3595 auth);
0bed9b5c
SW		 3596 if (ret)
3597 return ERR_PTR(ret);
27859f97
SW		 3598 } else {
3599 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3600 auth);
a255651d 3601 if (ret)
a3530df3 3602 return ERR_PTR(ret);
4e7a5dcd 3603 }
4e7a5dcd 3604 *proto = ac->protocol;
74f1869f 3605
a3530df3 3606 return auth;
4e7a5dcd
SW		 3607}
3608
3609
3610static int verify_authorizer_reply(struct ceph_connection *con, int len)
3611{
3612 struct ceph_mds_session *s = con->private;
3613 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3614 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4e7a5dcd 3615
27859f97 3616 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
4e7a5dcd
SW		 3617}
3618
9bd2e6f8
SW		 3619static int invalidate_authorizer(struct ceph_connection *con)
3620{
3621 struct ceph_mds_session *s = con->private;
3622 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3623 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 3624
27859f97 3625 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 3626
3d14c5d2 3627 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 3628}
3629
53ded495
AE		 3630static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3631 struct ceph_msg_header *hdr, int *skip)
3632{
3633 struct ceph_msg *msg;
3634 int type = (int) le16_to_cpu(hdr->type);
3635 int front_len = (int) le32_to_cpu(hdr->front_len);
3636
3637 if (con->in_msg)
3638 return con->in_msg;
3639
3640 *skip = 0;
3641 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3642 if (!msg) {
3643 pr_err("unable to allocate msg type %d len %d\n",
3644 type, front_len);
3645 return NULL;
3646 }
53ded495
AE		 3647
3648 return msg;
3649}
3650
9e32789f 3651static const struct ceph_connection_operations mds_con_ops = {
2f2dc053
SW		 3652 .get = con_get,
3653 .put = con_put,
3654 .dispatch = dispatch,
4e7a5dcd
SW		 3655 .get_authorizer = get_authorizer,
3656 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 3657 .invalidate_authorizer = invalidate_authorizer,
2f2dc053 3658 .peer_reset = peer_reset,
53ded495 3659 .alloc_msg = mds_alloc_msg,
2f2dc053
SW		 3660};
3661
2f2dc053 3662/* eof */
Linux kernel - Deliverables
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