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dmaengine: imx-dma: fix slow path issue in prep_dma_cyclic
[linux/fpc-iii.git] / fs / ceph / mds_client.c
blob187bf214444da8c8fc9c6a8603b699a258f773f8
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/fs.h>
4 #include <linux/wait.h>
5 #include <linux/slab.h>
6 #include <linux/sched.h>
7 #include <linux/debugfs.h>
8 #include <linux/seq_file.h>
9
10 #include "super.h"
11 #include "mds_client.h"
12
13 #include <linux/ceph/ceph_features.h>
14 #include <linux/ceph/messenger.h>
15 #include <linux/ceph/decode.h>
16 #include <linux/ceph/pagelist.h>
17 #include <linux/ceph/auth.h>
18 #include <linux/ceph/debugfs.h>
19
20 /*
21 * A cluster of MDS (metadata server) daemons is responsible for
22 * managing the file system namespace (the directory hierarchy and
23 * inodes) and for coordinating shared access to storage. Metadata is
24 * partitioning hierarchically across a number of servers, and that
25 * partition varies over time as the cluster adjusts the distribution
26 * in order to balance load.
27 *
28 * The MDS client is primarily responsible to managing synchronous
29 * metadata requests for operations like open, unlink, and so forth.
30 * If there is a MDS failure, we find out about it when we (possibly
31 * request and) receive a new MDS map, and can resubmit affected
32 * requests.
33 *
34 * For the most part, though, we take advantage of a lossless
35 * communications channel to the MDS, and do not need to worry about
36 * timing out or resubmitting requests.
37 *
38 * We maintain a stateful "session" with each MDS we interact with.
39 * Within each session, we sent periodic heartbeat messages to ensure
40 * any capabilities or leases we have been issues remain valid. If
41 * the session times out and goes stale, our leases and capabilities
42 * are no longer valid.
43 */
44
45 struct ceph_reconnect_state {
46 struct ceph_pagelist *pagelist;
47 bool flock;
48 };
49
50 static void __wake_requests(struct ceph_mds_client *mdsc,
51 struct list_head *head);
52
53 static const struct ceph_connection_operations mds_con_ops;
54
55
56 /*
57 * mds reply parsing
58 */
59
60 /*
61 * parse individual inode info
62 */
63 static int parse_reply_info_in(void **p, void *end,
64 struct ceph_mds_reply_info_in *info,
65 int features)
66 {
67 int err = -EIO;
68
69 info->in = *p;
70 *p += sizeof(struct ceph_mds_reply_inode) +
71 sizeof(*info->in->fragtree.splits) *
72 le32_to_cpu(info->in->fragtree.nsplits);
73
74 ceph_decode_32_safe(p, end, info->symlink_len, bad);
75 ceph_decode_need(p, end, info->symlink_len, bad);
76 info->symlink = *p;
77 *p += info->symlink_len;
78
79 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
80 ceph_decode_copy_safe(p, end, &info->dir_layout,
81 sizeof(info->dir_layout), bad);
82 else
83 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
84
85 ceph_decode_32_safe(p, end, info->xattr_len, bad);
86 ceph_decode_need(p, end, info->xattr_len, bad);
87 info->xattr_data = *p;
88 *p += info->xattr_len;
89 return 0;
90 bad:
91 return err;
92 }
93
94 /*
95 * parse a normal reply, which may contain a (dir+)dentry and/or a
96 * target inode.
97 */
98 static int parse_reply_info_trace(void **p, void *end,
99 struct ceph_mds_reply_info_parsed *info,
100 int features)
101 {
102 int err;
103
104 if (info->head->is_dentry) {
105 err = parse_reply_info_in(p, end, &info->diri, features);
106 if (err < 0)
107 goto out_bad;
108
109 if (unlikely(*p + sizeof(*info->dirfrag) > end))
110 goto bad;
111 info->dirfrag = *p;
112 *p += sizeof(*info->dirfrag) +
113 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
114 if (unlikely(*p > end))
115 goto bad;
116
117 ceph_decode_32_safe(p, end, info->dname_len, bad);
118 ceph_decode_need(p, end, info->dname_len, bad);
119 info->dname = *p;
120 *p += info->dname_len;
121 info->dlease = *p;
122 *p += sizeof(*info->dlease);
123 }
124
125 if (info->head->is_target) {
126 err = parse_reply_info_in(p, end, &info->targeti, features);
127 if (err < 0)
128 goto out_bad;
129 }
130
131 if (unlikely(*p != end))
132 goto bad;
133 return 0;
134
135 bad:
136 err = -EIO;
137 out_bad:
138 pr_err("problem parsing mds trace %d\n", err);
139 return err;
140 }
141
142 /*
143 * parse readdir results
144 */
145 static int parse_reply_info_dir(void **p, void *end,
146 struct ceph_mds_reply_info_parsed *info,
147 int features)
148 {
149 u32 num, i = 0;
150 int err;
151
152 info->dir_dir = *p;
153 if (*p + sizeof(*info->dir_dir) > end)
154 goto bad;
155 *p += sizeof(*info->dir_dir) +
156 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
157 if (*p > end)
158 goto bad;
159
160 ceph_decode_need(p, end, sizeof(num) + 2, bad);
161 num = ceph_decode_32(p);
162 info->dir_end = ceph_decode_8(p);
163 info->dir_complete = ceph_decode_8(p);
164 if (num == 0)
165 goto done;
166
167 /* alloc large array */
168 info->dir_nr = num;
169 info->dir_in = kcalloc(num, sizeof(*info->dir_in) +
170 sizeof(*info->dir_dname) +
171 sizeof(*info->dir_dname_len) +
172 sizeof(*info->dir_dlease),
173 GFP_NOFS);
174 if (info->dir_in == NULL) {
175 err = -ENOMEM;
176 goto out_bad;
177 }
178 info->dir_dname = (void *)(info->dir_in + num);
179 info->dir_dname_len = (void *)(info->dir_dname + num);
180 info->dir_dlease = (void *)(info->dir_dname_len + num);
181
182 while (num) {
183 /* dentry */
184 ceph_decode_need(p, end, sizeof(u32)*2, bad);
185 info->dir_dname_len[i] = ceph_decode_32(p);
186 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
187 info->dir_dname[i] = *p;
188 *p += info->dir_dname_len[i];
189 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
190 info->dir_dname[i]);
191 info->dir_dlease[i] = *p;
192 *p += sizeof(struct ceph_mds_reply_lease);
193
194 /* inode */
195 err = parse_reply_info_in(p, end, &info->dir_in[i], features);
196 if (err < 0)
197 goto out_bad;
198 i++;
199 num--;
200 }
201
202 done:
203 if (*p != end)
204 goto bad;
205 return 0;
206
207 bad:
208 err = -EIO;
209 out_bad:
210 pr_err("problem parsing dir contents %d\n", err);
211 return err;
212 }
213
214 /*
215 * parse fcntl F_GETLK results
216 */
217 static int parse_reply_info_filelock(void **p, void *end,
218 struct ceph_mds_reply_info_parsed *info,
219 int features)
220 {
221 if (*p + sizeof(*info->filelock_reply) > end)
222 goto bad;
223
224 info->filelock_reply = *p;
225 *p += sizeof(*info->filelock_reply);
226
227 if (unlikely(*p != end))
228 goto bad;
229 return 0;
230
231 bad:
232 return -EIO;
233 }
234
235 /*
236 * parse create results
237 */
238 static int parse_reply_info_create(void **p, void *end,
239 struct ceph_mds_reply_info_parsed *info,
240 int features)
241 {
242 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
243 if (*p == end) {
244 info->has_create_ino = false;
245 } else {
246 info->has_create_ino = true;
247 info->ino = ceph_decode_64(p);
248 }
249 }
250
251 if (unlikely(*p != end))
252 goto bad;
253 return 0;
254
255 bad:
256 return -EIO;
257 }
258
259 /*
260 * parse extra results
261 */
262 static int parse_reply_info_extra(void **p, void *end,
263 struct ceph_mds_reply_info_parsed *info,
264 int features)
265 {
266 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
267 return parse_reply_info_filelock(p, end, info, features);
268 else if (info->head->op == CEPH_MDS_OP_READDIR ||
269 info->head->op == CEPH_MDS_OP_LSSNAP)
270 return parse_reply_info_dir(p, end, info, features);
271 else if (info->head->op == CEPH_MDS_OP_CREATE)
272 return parse_reply_info_create(p, end, info, features);
273 else
274 return -EIO;
275 }
276
277 /*
278 * parse entire mds reply
279 */
280 static int parse_reply_info(struct ceph_msg *msg,
281 struct ceph_mds_reply_info_parsed *info,
282 int features)
283 {
284 void *p, *end;
285 u32 len;
286 int err;
287
288 info->head = msg->front.iov_base;
289 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
290 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
291
292 /* trace */
293 ceph_decode_32_safe(&p, end, len, bad);
294 if (len > 0) {
295 ceph_decode_need(&p, end, len, bad);
296 err = parse_reply_info_trace(&p, p+len, info, features);
297 if (err < 0)
298 goto out_bad;
299 }
300
301 /* extra */
302 ceph_decode_32_safe(&p, end, len, bad);
303 if (len > 0) {
304 ceph_decode_need(&p, end, len, bad);
305 err = parse_reply_info_extra(&p, p+len, info, features);
306 if (err < 0)
307 goto out_bad;
308 }
309
310 /* snap blob */
311 ceph_decode_32_safe(&p, end, len, bad);
312 info->snapblob_len = len;
313 info->snapblob = p;
314 p += len;
315
316 if (p != end)
317 goto bad;
318 return 0;
319
320 bad:
321 err = -EIO;
322 out_bad:
323 pr_err("mds parse_reply err %d\n", err);
324 return err;
325 }
326
327 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
328 {
329 kfree(info->dir_in);
330 }
331
332
333 /*
334 * sessions
335 */
336 static const char *session_state_name(int s)
337 {
338 switch (s) {
339 case CEPH_MDS_SESSION_NEW: return "new";
340 case CEPH_MDS_SESSION_OPENING: return "opening";
341 case CEPH_MDS_SESSION_OPEN: return "open";
342 case CEPH_MDS_SESSION_HUNG: return "hung";
343 case CEPH_MDS_SESSION_CLOSING: return "closing";
344 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
345 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
346 default: return "???";
347 }
348 }
349
350 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
351 {
352 if (atomic_inc_not_zero(&s->s_ref)) {
353 dout("mdsc get_session %p %d -> %d\n", s,
354 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
355 return s;
356 } else {
357 dout("mdsc get_session %p 0 -- FAIL", s);
358 return NULL;
359 }
360 }
361
362 void ceph_put_mds_session(struct ceph_mds_session *s)
363 {
364 dout("mdsc put_session %p %d -> %d\n", s,
365 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
366 if (atomic_dec_and_test(&s->s_ref)) {
367 if (s->s_auth.authorizer)
368 ceph_auth_destroy_authorizer(
369 s->s_mdsc->fsc->client->monc.auth,
370 s->s_auth.authorizer);
371 kfree(s);
372 }
373 }
374
375 /*
376 * called under mdsc->mutex
377 */
378 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
379 int mds)
380 {
381 struct ceph_mds_session *session;
382
383 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
384 return NULL;
385 session = mdsc->sessions[mds];
386 dout("lookup_mds_session %p %d\n", session,
387 atomic_read(&session->s_ref));
388 get_session(session);
389 return session;
390 }
391
392 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
393 {
394 if (mds >= mdsc->max_sessions)
395 return false;
396 return mdsc->sessions[mds];
397 }
398
399 static int __verify_registered_session(struct ceph_mds_client *mdsc,
400 struct ceph_mds_session *s)
401 {
402 if (s->s_mds >= mdsc->max_sessions ||
403 mdsc->sessions[s->s_mds] != s)
404 return -ENOENT;
405 return 0;
406 }
407
408 /*
409 * create+register a new session for given mds.
410 * called under mdsc->mutex.
411 */
412 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
413 int mds)
414 {
415 struct ceph_mds_session *s;
416
417 s = kzalloc(sizeof(*s), GFP_NOFS);
418 if (!s)
419 return ERR_PTR(-ENOMEM);
420 s->s_mdsc = mdsc;
421 s->s_mds = mds;
422 s->s_state = CEPH_MDS_SESSION_NEW;
423 s->s_ttl = 0;
424 s->s_seq = 0;
425 mutex_init(&s->s_mutex);
426
427 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
428
429 spin_lock_init(&s->s_gen_ttl_lock);
430 s->s_cap_gen = 0;
431 s->s_cap_ttl = jiffies - 1;
432
433 spin_lock_init(&s->s_cap_lock);
434 s->s_renew_requested = 0;
435 s->s_renew_seq = 0;
436 INIT_LIST_HEAD(&s->s_caps);
437 s->s_nr_caps = 0;
438 s->s_trim_caps = 0;
439 atomic_set(&s->s_ref, 1);
440 INIT_LIST_HEAD(&s->s_waiting);
441 INIT_LIST_HEAD(&s->s_unsafe);
442 s->s_num_cap_releases = 0;
443 s->s_cap_iterator = NULL;
444 INIT_LIST_HEAD(&s->s_cap_releases);
445 INIT_LIST_HEAD(&s->s_cap_releases_done);
446 INIT_LIST_HEAD(&s->s_cap_flushing);
447 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
448
449 dout("register_session mds%d\n", mds);
450 if (mds >= mdsc->max_sessions) {
451 int newmax = 1 << get_count_order(mds+1);
452 struct ceph_mds_session **sa;
453
454 dout("register_session realloc to %d\n", newmax);
455 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
456 if (sa == NULL)
457 goto fail_realloc;
458 if (mdsc->sessions) {
459 memcpy(sa, mdsc->sessions,
460 mdsc->max_sessions * sizeof(void *));
461 kfree(mdsc->sessions);
462 }
463 mdsc->sessions = sa;
464 mdsc->max_sessions = newmax;
465 }
466 mdsc->sessions[mds] = s;
467 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
468
469 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
470 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
471
472 return s;
473
474 fail_realloc:
475 kfree(s);
476 return ERR_PTR(-ENOMEM);
477 }
478
479 /*
480 * called under mdsc->mutex
481 */
482 static void __unregister_session(struct ceph_mds_client *mdsc,
483 struct ceph_mds_session *s)
484 {
485 dout("__unregister_session mds%d %p\n", s->s_mds, s);
486 BUG_ON(mdsc->sessions[s->s_mds] != s);
487 mdsc->sessions[s->s_mds] = NULL;
488 ceph_con_close(&s->s_con);
489 ceph_put_mds_session(s);
490 }
491
492 /*
493 * drop session refs in request.
494 *
495 * should be last request ref, or hold mdsc->mutex
496 */
497 static void put_request_session(struct ceph_mds_request *req)
498 {
499 if (req->r_session) {
500 ceph_put_mds_session(req->r_session);
501 req->r_session = NULL;
502 }
503 }
504
505 void ceph_mdsc_release_request(struct kref *kref)
506 {
507 struct ceph_mds_request *req = container_of(kref,
508 struct ceph_mds_request,
509 r_kref);
510 if (req->r_request)
511 ceph_msg_put(req->r_request);
512 if (req->r_reply) {
513 ceph_msg_put(req->r_reply);
514 destroy_reply_info(&req->r_reply_info);
515 }
516 if (req->r_inode) {
517 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
518 iput(req->r_inode);
519 }
520 if (req->r_locked_dir)
521 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
522 if (req->r_target_inode)
523 iput(req->r_target_inode);
524 if (req->r_dentry)
525 dput(req->r_dentry);
526 if (req->r_old_dentry) {
527 /*
528 * track (and drop pins for) r_old_dentry_dir
529 * separately, since r_old_dentry's d_parent may have
530 * changed between the dir mutex being dropped and
531 * this request being freed.
532 */
533 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
534 CEPH_CAP_PIN);
535 dput(req->r_old_dentry);
536 iput(req->r_old_dentry_dir);
537 }
538 kfree(req->r_path1);
539 kfree(req->r_path2);
540 put_request_session(req);
541 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
542 kfree(req);
543 }
544
545 /*
546 * lookup session, bump ref if found.
547 *
548 * called under mdsc->mutex.
549 */
550 static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
551 u64 tid)
552 {
553 struct ceph_mds_request *req;
554 struct rb_node *n = mdsc->request_tree.rb_node;
555
556 while (n) {
557 req = rb_entry(n, struct ceph_mds_request, r_node);
558 if (tid < req->r_tid)
559 n = n->rb_left;
560 else if (tid > req->r_tid)
561 n = n->rb_right;
562 else {
563 ceph_mdsc_get_request(req);
564 return req;
565 }
566 }
567 return NULL;
568 }
569
570 static void __insert_request(struct ceph_mds_client *mdsc,
571 struct ceph_mds_request *new)
572 {
573 struct rb_node **p = &mdsc->request_tree.rb_node;
574 struct rb_node *parent = NULL;
575 struct ceph_mds_request *req = NULL;
576
577 while (*p) {
578 parent = *p;
579 req = rb_entry(parent, struct ceph_mds_request, r_node);
580 if (new->r_tid < req->r_tid)
581 p = &(*p)->rb_left;
582 else if (new->r_tid > req->r_tid)
583 p = &(*p)->rb_right;
584 else
585 BUG();
586 }
587
588 rb_link_node(&new->r_node, parent, p);
589 rb_insert_color(&new->r_node, &mdsc->request_tree);
590 }
591
592 /*
593 * Register an in-flight request, and assign a tid. Link to directory
594 * are modifying (if any).
595 *
596 * Called under mdsc->mutex.
597 */
598 static void __register_request(struct ceph_mds_client *mdsc,
599 struct ceph_mds_request *req,
600 struct inode *dir)
601 {
602 req->r_tid = ++mdsc->last_tid;
603 if (req->r_num_caps)
604 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
605 req->r_num_caps);
606 dout("__register_request %p tid %lld\n", req, req->r_tid);
607 ceph_mdsc_get_request(req);
608 __insert_request(mdsc, req);
609
610 req->r_uid = current_fsuid();
611 req->r_gid = current_fsgid();
612
613 if (dir) {
614 struct ceph_inode_info *ci = ceph_inode(dir);
615
616 ihold(dir);
617 spin_lock(&ci->i_unsafe_lock);
618 req->r_unsafe_dir = dir;
619 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
620 spin_unlock(&ci->i_unsafe_lock);
621 }
622 }
623
624 static void __unregister_request(struct ceph_mds_client *mdsc,
625 struct ceph_mds_request *req)
626 {
627 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
628 rb_erase(&req->r_node, &mdsc->request_tree);
629 RB_CLEAR_NODE(&req->r_node);
630
631 if (req->r_unsafe_dir) {
632 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
633
634 spin_lock(&ci->i_unsafe_lock);
635 list_del_init(&req->r_unsafe_dir_item);
636 spin_unlock(&ci->i_unsafe_lock);
637
638 iput(req->r_unsafe_dir);
639 req->r_unsafe_dir = NULL;
640 }
641
642 ceph_mdsc_put_request(req);
643 }
644
645 /*
646 * Choose mds to send request to next. If there is a hint set in the
647 * request (e.g., due to a prior forward hint from the mds), use that.
648 * Otherwise, consult frag tree and/or caps to identify the
649 * appropriate mds. If all else fails, choose randomly.
650 *
651 * Called under mdsc->mutex.
652 */
653 static struct dentry *get_nonsnap_parent(struct dentry *dentry)
654 {
655 /*
656 * we don't need to worry about protecting the d_parent access
657 * here because we never renaming inside the snapped namespace
658 * except to resplice to another snapdir, and either the old or new
659 * result is a valid result.
660 */
661 while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
662 dentry = dentry->d_parent;
663 return dentry;
664 }
665
666 static int __choose_mds(struct ceph_mds_client *mdsc,
667 struct ceph_mds_request *req)
668 {
669 struct inode *inode;
670 struct ceph_inode_info *ci;
671 struct ceph_cap *cap;
672 int mode = req->r_direct_mode;
673 int mds = -1;
674 u32 hash = req->r_direct_hash;
675 bool is_hash = req->r_direct_is_hash;
676
677 /*
678 * is there a specific mds we should try? ignore hint if we have
679 * no session and the mds is not up (active or recovering).
680 */
681 if (req->r_resend_mds >= 0 &&
682 (__have_session(mdsc, req->r_resend_mds) ||
683 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
684 dout("choose_mds using resend_mds mds%d\n",
685 req->r_resend_mds);
686 return req->r_resend_mds;
687 }
688
689 if (mode == USE_RANDOM_MDS)
690 goto random;
691
692 inode = NULL;
693 if (req->r_inode) {
694 inode = req->r_inode;
695 } else if (req->r_dentry) {
696 /* ignore race with rename; old or new d_parent is okay */
697 struct dentry *parent = req->r_dentry->d_parent;
698 struct inode *dir = parent->d_inode;
699
700 if (dir->i_sb != mdsc->fsc->sb) {
701 /* not this fs! */
702 inode = req->r_dentry->d_inode;
703 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
704 /* direct snapped/virtual snapdir requests
705 * based on parent dir inode */
706 struct dentry *dn = get_nonsnap_parent(parent);
707 inode = dn->d_inode;
708 dout("__choose_mds using nonsnap parent %p\n", inode);
709 } else if (req->r_dentry->d_inode) {
710 /* dentry target */
711 inode = req->r_dentry->d_inode;
712 } else {
713 /* dir + name */
714 inode = dir;
715 hash = ceph_dentry_hash(dir, req->r_dentry);
716 is_hash = true;
717 }
718 }
719
720 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
721 (int)hash, mode);
722 if (!inode)
723 goto random;
724 ci = ceph_inode(inode);
725
726 if (is_hash && S_ISDIR(inode->i_mode)) {
727 struct ceph_inode_frag frag;
728 int found;
729
730 ceph_choose_frag(ci, hash, &frag, &found);
731 if (found) {
732 if (mode == USE_ANY_MDS && frag.ndist > 0) {
733 u8 r;
734
735 /* choose a random replica */
736 get_random_bytes(&r, 1);
737 r %= frag.ndist;
738 mds = frag.dist[r];
739 dout("choose_mds %p %llx.%llx "
740 "frag %u mds%d (%d/%d)\n",
741 inode, ceph_vinop(inode),
742 frag.frag, mds,
743 (int)r, frag.ndist);
744 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
745 CEPH_MDS_STATE_ACTIVE)
746 return mds;
747 }
748
749 /* since this file/dir wasn't known to be
750 * replicated, then we want to look for the
751 * authoritative mds. */
752 mode = USE_AUTH_MDS;
753 if (frag.mds >= 0) {
754 /* choose auth mds */
755 mds = frag.mds;
756 dout("choose_mds %p %llx.%llx "
757 "frag %u mds%d (auth)\n",
758 inode, ceph_vinop(inode), frag.frag, mds);
759 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
760 CEPH_MDS_STATE_ACTIVE)
761 return mds;
762 }
763 }
764 }
765
766 spin_lock(&ci->i_ceph_lock);
767 cap = NULL;
768 if (mode == USE_AUTH_MDS)
769 cap = ci->i_auth_cap;
770 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
771 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
772 if (!cap) {
773 spin_unlock(&ci->i_ceph_lock);
774 goto random;
775 }
776 mds = cap->session->s_mds;
777 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
778 inode, ceph_vinop(inode), mds,
779 cap == ci->i_auth_cap ? "auth " : "", cap);
780 spin_unlock(&ci->i_ceph_lock);
781 return mds;
782
783 random:
784 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
785 dout("choose_mds chose random mds%d\n", mds);
786 return mds;
787 }
788
789
790 /*
791 * session messages
792 */
793 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
794 {
795 struct ceph_msg *msg;
796 struct ceph_mds_session_head *h;
797
798 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
799 false);
800 if (!msg) {
801 pr_err("create_session_msg ENOMEM creating msg\n");
802 return NULL;
803 }
804 h = msg->front.iov_base;
805 h->op = cpu_to_le32(op);
806 h->seq = cpu_to_le64(seq);
807 return msg;
808 }
809
810 /*
811 * send session open request.
812 *
813 * called under mdsc->mutex
814 */
815 static int __open_session(struct ceph_mds_client *mdsc,
816 struct ceph_mds_session *session)
817 {
818 struct ceph_msg *msg;
819 int mstate;
820 int mds = session->s_mds;
821
822 /* wait for mds to go active? */
823 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
824 dout("open_session to mds%d (%s)\n", mds,
825 ceph_mds_state_name(mstate));
826 session->s_state = CEPH_MDS_SESSION_OPENING;
827 session->s_renew_requested = jiffies;
828
829 /* send connect message */
830 msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq);
831 if (!msg)
832 return -ENOMEM;
833 ceph_con_send(&session->s_con, msg);
834 return 0;
835 }
836
837 /*
838 * open sessions for any export targets for the given mds
839 *
840 * called under mdsc->mutex
841 */
842 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
843 struct ceph_mds_session *session)
844 {
845 struct ceph_mds_info *mi;
846 struct ceph_mds_session *ts;
847 int i, mds = session->s_mds;
848 int target;
849
850 if (mds >= mdsc->mdsmap->m_max_mds)
851 return;
852 mi = &mdsc->mdsmap->m_info[mds];
853 dout("open_export_target_sessions for mds%d (%d targets)\n",
854 session->s_mds, mi->num_export_targets);
855
856 for (i = 0; i < mi->num_export_targets; i++) {
857 target = mi->export_targets[i];
858 ts = __ceph_lookup_mds_session(mdsc, target);
859 if (!ts) {
860 ts = register_session(mdsc, target);
861 if (IS_ERR(ts))
862 return;
863 }
864 if (session->s_state == CEPH_MDS_SESSION_NEW ||
865 session->s_state == CEPH_MDS_SESSION_CLOSING)
866 __open_session(mdsc, session);
867 else
868 dout(" mds%d target mds%d %p is %s\n", session->s_mds,
869 i, ts, session_state_name(ts->s_state));
870 ceph_put_mds_session(ts);
871 }
872 }
873
874 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
875 struct ceph_mds_session *session)
876 {
877 mutex_lock(&mdsc->mutex);
878 __open_export_target_sessions(mdsc, session);
879 mutex_unlock(&mdsc->mutex);
880 }
881
882 /*
883 * session caps
884 */
885
886 /*
887 * Free preallocated cap messages assigned to this session
888 */
889 static void cleanup_cap_releases(struct ceph_mds_session *session)
890 {
891 struct ceph_msg *msg;
892
893 spin_lock(&session->s_cap_lock);
894 while (!list_empty(&session->s_cap_releases)) {
895 msg = list_first_entry(&session->s_cap_releases,
896 struct ceph_msg, list_head);
897 list_del_init(&msg->list_head);
898 ceph_msg_put(msg);
899 }
900 while (!list_empty(&session->s_cap_releases_done)) {
901 msg = list_first_entry(&session->s_cap_releases_done,
902 struct ceph_msg, list_head);
903 list_del_init(&msg->list_head);
904 ceph_msg_put(msg);
905 }
906 spin_unlock(&session->s_cap_lock);
907 }
908
909 /*
910 * Helper to safely iterate over all caps associated with a session, with
911 * special care taken to handle a racing __ceph_remove_cap().
912 *
913 * Caller must hold session s_mutex.
914 */
915 static int iterate_session_caps(struct ceph_mds_session *session,
916 int (*cb)(struct inode *, struct ceph_cap *,
917 void *), void *arg)
918 {
919 struct list_head *p;
920 struct ceph_cap *cap;
921 struct inode *inode, *last_inode = NULL;
922 struct ceph_cap *old_cap = NULL;
923 int ret;
924
925 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
926 spin_lock(&session->s_cap_lock);
927 p = session->s_caps.next;
928 while (p != &session->s_caps) {
929 cap = list_entry(p, struct ceph_cap, session_caps);
930 inode = igrab(&cap->ci->vfs_inode);
931 if (!inode) {
932 p = p->next;
933 continue;
934 }
935 session->s_cap_iterator = cap;
936 spin_unlock(&session->s_cap_lock);
937
938 if (last_inode) {
939 iput(last_inode);
940 last_inode = NULL;
941 }
942 if (old_cap) {
943 ceph_put_cap(session->s_mdsc, old_cap);
944 old_cap = NULL;
945 }
946
947 ret = cb(inode, cap, arg);
948 last_inode = inode;
949
950 spin_lock(&session->s_cap_lock);
951 p = p->next;
952 if (cap->ci == NULL) {
953 dout("iterate_session_caps finishing cap %p removal\n",
954 cap);
955 BUG_ON(cap->session != session);
956 list_del_init(&cap->session_caps);
957 session->s_nr_caps--;
958 cap->session = NULL;
959 old_cap = cap; /* put_cap it w/o locks held */
960 }
961 if (ret < 0)
962 goto out;
963 }
964 ret = 0;
965 out:
966 session->s_cap_iterator = NULL;
967 spin_unlock(&session->s_cap_lock);
968
969 if (last_inode)
970 iput(last_inode);
971 if (old_cap)
972 ceph_put_cap(session->s_mdsc, old_cap);
973
974 return ret;
975 }
976
977 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
978 void *arg)
979 {
980 struct ceph_inode_info *ci = ceph_inode(inode);
981 int drop = 0;
982
983 dout("removing cap %p, ci is %p, inode is %p\n",
984 cap, ci, &ci->vfs_inode);
985 spin_lock(&ci->i_ceph_lock);
986 __ceph_remove_cap(cap);
987 if (!__ceph_is_any_real_caps(ci)) {
988 struct ceph_mds_client *mdsc =
989 ceph_sb_to_client(inode->i_sb)->mdsc;
990
991 spin_lock(&mdsc->cap_dirty_lock);
992 if (!list_empty(&ci->i_dirty_item)) {
993 pr_info(" dropping dirty %s state for %p %lld\n",
994 ceph_cap_string(ci->i_dirty_caps),
995 inode, ceph_ino(inode));
996 ci->i_dirty_caps = 0;
997 list_del_init(&ci->i_dirty_item);
998 drop = 1;
999 }
1000 if (!list_empty(&ci->i_flushing_item)) {
1001 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
1002 ceph_cap_string(ci->i_flushing_caps),
1003 inode, ceph_ino(inode));
1004 ci->i_flushing_caps = 0;
1005 list_del_init(&ci->i_flushing_item);
1006 mdsc->num_cap_flushing--;
1007 drop = 1;
1008 }
1009 if (drop && ci->i_wrbuffer_ref) {
1010 pr_info(" dropping dirty data for %p %lld\n",
1011 inode, ceph_ino(inode));
1012 ci->i_wrbuffer_ref = 0;
1013 ci->i_wrbuffer_ref_head = 0;
1014 drop++;
1015 }
1016 spin_unlock(&mdsc->cap_dirty_lock);
1017 }
1018 spin_unlock(&ci->i_ceph_lock);
1019 while (drop--)
1020 iput(inode);
1021 return 0;
1022 }
1023
1024 /*
1025 * caller must hold session s_mutex
1026 */
1027 static void remove_session_caps(struct ceph_mds_session *session)
1028 {
1029 dout("remove_session_caps on %p\n", session);
1030 iterate_session_caps(session, remove_session_caps_cb, NULL);
1031 BUG_ON(session->s_nr_caps > 0);
1032 BUG_ON(!list_empty(&session->s_cap_flushing));
1033 cleanup_cap_releases(session);
1034 }
1035
1036 /*
1037 * wake up any threads waiting on this session's caps. if the cap is
1038 * old (didn't get renewed on the client reconnect), remove it now.
1039 *
1040 * caller must hold s_mutex.
1041 */
1042 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1043 void *arg)
1044 {
1045 struct ceph_inode_info *ci = ceph_inode(inode);
1046
1047 wake_up_all(&ci->i_cap_wq);
1048 if (arg) {
1049 spin_lock(&ci->i_ceph_lock);
1050 ci->i_wanted_max_size = 0;
1051 ci->i_requested_max_size = 0;
1052 spin_unlock(&ci->i_ceph_lock);
1053 }
1054 return 0;
1055 }
1056
1057 static void wake_up_session_caps(struct ceph_mds_session *session,
1058 int reconnect)
1059 {
1060 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1061 iterate_session_caps(session, wake_up_session_cb,
1062 (void *)(unsigned long)reconnect);
1063 }
1064
1065 /*
1066 * Send periodic message to MDS renewing all currently held caps. The
1067 * ack will reset the expiration for all caps from this session.
1068 *
1069 * caller holds s_mutex
1070 */
1071 static int send_renew_caps(struct ceph_mds_client *mdsc,
1072 struct ceph_mds_session *session)
1073 {
1074 struct ceph_msg *msg;
1075 int state;
1076
1077 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1078 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1079 pr_info("mds%d caps stale\n", session->s_mds);
1080 session->s_renew_requested = jiffies;
1081
1082 /* do not try to renew caps until a recovering mds has reconnected
1083 * with its clients. */
1084 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1085 if (state < CEPH_MDS_STATE_RECONNECT) {
1086 dout("send_renew_caps ignoring mds%d (%s)\n",
1087 session->s_mds, ceph_mds_state_name(state));
1088 return 0;
1089 }
1090
1091 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1092 ceph_mds_state_name(state));
1093 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1094 ++session->s_renew_seq);
1095 if (!msg)
1096 return -ENOMEM;
1097 ceph_con_send(&session->s_con, msg);
1098 return 0;
1099 }
1100
1101 /*
1102 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1103 *
1104 * Called under session->s_mutex
1105 */
1106 static void renewed_caps(struct ceph_mds_client *mdsc,
1107 struct ceph_mds_session *session, int is_renew)
1108 {
1109 int was_stale;
1110 int wake = 0;
1111
1112 spin_lock(&session->s_cap_lock);
1113 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1114
1115 session->s_cap_ttl = session->s_renew_requested +
1116 mdsc->mdsmap->m_session_timeout*HZ;
1117
1118 if (was_stale) {
1119 if (time_before(jiffies, session->s_cap_ttl)) {
1120 pr_info("mds%d caps renewed\n", session->s_mds);
1121 wake = 1;
1122 } else {
1123 pr_info("mds%d caps still stale\n", session->s_mds);
1124 }
1125 }
1126 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1127 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1128 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1129 spin_unlock(&session->s_cap_lock);
1130
1131 if (wake)
1132 wake_up_session_caps(session, 0);
1133 }
1134
1135 /*
1136 * send a session close request
1137 */
1138 static int request_close_session(struct ceph_mds_client *mdsc,
1139 struct ceph_mds_session *session)
1140 {
1141 struct ceph_msg *msg;
1142
1143 dout("request_close_session mds%d state %s seq %lld\n",
1144 session->s_mds, session_state_name(session->s_state),
1145 session->s_seq);
1146 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1147 if (!msg)
1148 return -ENOMEM;
1149 ceph_con_send(&session->s_con, msg);
1150 return 0;
1151 }
1152
1153 /*
1154 * Called with s_mutex held.
1155 */
1156 static int __close_session(struct ceph_mds_client *mdsc,
1157 struct ceph_mds_session *session)
1158 {
1159 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1160 return 0;
1161 session->s_state = CEPH_MDS_SESSION_CLOSING;
1162 return request_close_session(mdsc, session);
1163 }
1164
1165 /*
1166 * Trim old(er) caps.
1167 *
1168 * Because we can't cache an inode without one or more caps, we do
1169 * this indirectly: if a cap is unused, we prune its aliases, at which
1170 * point the inode will hopefully get dropped to.
1171 *
1172 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1173 * memory pressure from the MDS, though, so it needn't be perfect.
1174 */
1175 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1176 {
1177 struct ceph_mds_session *session = arg;
1178 struct ceph_inode_info *ci = ceph_inode(inode);
1179 int used, oissued, mine;
1180
1181 if (session->s_trim_caps <= 0)
1182 return -1;
1183
1184 spin_lock(&ci->i_ceph_lock);
1185 mine = cap->issued | cap->implemented;
1186 used = __ceph_caps_used(ci);
1187 oissued = __ceph_caps_issued_other(ci, cap);
1188
1189 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
1190 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1191 ceph_cap_string(used));
1192 if (ci->i_dirty_caps)
1193 goto out; /* dirty caps */
1194 if ((used & ~oissued) & mine)
1195 goto out; /* we need these caps */
1196
1197 session->s_trim_caps--;
1198 if (oissued) {
1199 /* we aren't the only cap.. just remove us */
1200 __queue_cap_release(session, ceph_ino(inode), cap->cap_id,
1201 cap->mseq, cap->issue_seq);
1202 __ceph_remove_cap(cap);
1203 } else {
1204 /* try to drop referring dentries */
1205 spin_unlock(&ci->i_ceph_lock);
1206 d_prune_aliases(inode);
1207 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1208 inode, cap, atomic_read(&inode->i_count));
1209 return 0;
1210 }
1211
1212 out:
1213 spin_unlock(&ci->i_ceph_lock);
1214 return 0;
1215 }
1216
1217 /*
1218 * Trim session cap count down to some max number.
1219 */
1220 static int trim_caps(struct ceph_mds_client *mdsc,
1221 struct ceph_mds_session *session,
1222 int max_caps)
1223 {
1224 int trim_caps = session->s_nr_caps - max_caps;
1225
1226 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1227 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1228 if (trim_caps > 0) {
1229 session->s_trim_caps = trim_caps;
1230 iterate_session_caps(session, trim_caps_cb, session);
1231 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1232 session->s_mds, session->s_nr_caps, max_caps,
1233 trim_caps - session->s_trim_caps);
1234 session->s_trim_caps = 0;
1235 }
1236 return 0;
1237 }
1238
1239 /*
1240 * Allocate cap_release messages. If there is a partially full message
1241 * in the queue, try to allocate enough to cover it's remainder, so that
1242 * we can send it immediately.
1243 *
1244 * Called under s_mutex.
1245 */
1246 int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
1247 struct ceph_mds_session *session)
1248 {
1249 struct ceph_msg *msg, *partial = NULL;
1250 struct ceph_mds_cap_release *head;
1251 int err = -ENOMEM;
1252 int extra = mdsc->fsc->mount_options->cap_release_safety;
1253 int num;
1254
1255 dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
1256 extra);
1257
1258 spin_lock(&session->s_cap_lock);
1259
1260 if (!list_empty(&session->s_cap_releases)) {
1261 msg = list_first_entry(&session->s_cap_releases,
1262 struct ceph_msg,
1263 list_head);
1264 head = msg->front.iov_base;
1265 num = le32_to_cpu(head->num);
1266 if (num) {
1267 dout(" partial %p with (%d/%d)\n", msg, num,
1268 (int)CEPH_CAPS_PER_RELEASE);
1269 extra += CEPH_CAPS_PER_RELEASE - num;
1270 partial = msg;
1271 }
1272 }
1273 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1274 spin_unlock(&session->s_cap_lock);
1275 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
1276 GFP_NOFS, false);
1277 if (!msg)
1278 goto out_unlocked;
1279 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1280 (int)msg->front.iov_len);
1281 head = msg->front.iov_base;
1282 head->num = cpu_to_le32(0);
1283 msg->front.iov_len = sizeof(*head);
1284 spin_lock(&session->s_cap_lock);
1285 list_add(&msg->list_head, &session->s_cap_releases);
1286 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1287 }
1288
1289 if (partial) {
1290 head = partial->front.iov_base;
1291 num = le32_to_cpu(head->num);
1292 dout(" queueing partial %p with %d/%d\n", partial, num,
1293 (int)CEPH_CAPS_PER_RELEASE);
1294 list_move_tail(&partial->list_head,
1295 &session->s_cap_releases_done);
1296 session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
1297 }
1298 err = 0;
1299 spin_unlock(&session->s_cap_lock);
1300 out_unlocked:
1301 return err;
1302 }
1303
1304 /*
1305 * flush all dirty inode data to disk.
1306 *
1307 * returns true if we've flushed through want_flush_seq
1308 */
1309 static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
1310 {
1311 int mds, ret = 1;
1312
1313 dout("check_cap_flush want %lld\n", want_flush_seq);
1314 mutex_lock(&mdsc->mutex);
1315 for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
1316 struct ceph_mds_session *session = mdsc->sessions[mds];
1317
1318 if (!session)
1319 continue;
1320 get_session(session);
1321 mutex_unlock(&mdsc->mutex);
1322
1323 mutex_lock(&session->s_mutex);
1324 if (!list_empty(&session->s_cap_flushing)) {
1325 struct ceph_inode_info *ci =
1326 list_entry(session->s_cap_flushing.next,
1327 struct ceph_inode_info,
1328 i_flushing_item);
1329 struct inode *inode = &ci->vfs_inode;
1330
1331 spin_lock(&ci->i_ceph_lock);
1332 if (ci->i_cap_flush_seq <= want_flush_seq) {
1333 dout("check_cap_flush still flushing %p "
1334 "seq %lld <= %lld to mds%d\n", inode,
1335 ci->i_cap_flush_seq, want_flush_seq,
1336 session->s_mds);
1337 ret = 0;
1338 }
1339 spin_unlock(&ci->i_ceph_lock);
1340 }
1341 mutex_unlock(&session->s_mutex);
1342 ceph_put_mds_session(session);
1343
1344 if (!ret)
1345 return ret;
1346 mutex_lock(&mdsc->mutex);
1347 }
1348
1349 mutex_unlock(&mdsc->mutex);
1350 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
1351 return ret;
1352 }
1353
1354 /*
1355 * called under s_mutex
1356 */
1357 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1358 struct ceph_mds_session *session)
1359 {
1360 struct ceph_msg *msg;
1361
1362 dout("send_cap_releases mds%d\n", session->s_mds);
1363 spin_lock(&session->s_cap_lock);
1364 while (!list_empty(&session->s_cap_releases_done)) {
1365 msg = list_first_entry(&session->s_cap_releases_done,
1366 struct ceph_msg, list_head);
1367 list_del_init(&msg->list_head);
1368 spin_unlock(&session->s_cap_lock);
1369 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1370 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1371 ceph_con_send(&session->s_con, msg);
1372 spin_lock(&session->s_cap_lock);
1373 }
1374 spin_unlock(&session->s_cap_lock);
1375 }
1376
1377 static void discard_cap_releases(struct ceph_mds_client *mdsc,
1378 struct ceph_mds_session *session)
1379 {
1380 struct ceph_msg *msg;
1381 struct ceph_mds_cap_release *head;
1382 unsigned num;
1383
1384 dout("discard_cap_releases mds%d\n", session->s_mds);
1385 spin_lock(&session->s_cap_lock);
1386
1387 /* zero out the in-progress message */
1388 msg = list_first_entry(&session->s_cap_releases,
1389 struct ceph_msg, list_head);
1390 head = msg->front.iov_base;
1391 num = le32_to_cpu(head->num);
1392 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num);
1393 head->num = cpu_to_le32(0);
1394 msg->front.iov_len = sizeof(*head);
1395 session->s_num_cap_releases += num;
1396
1397 /* requeue completed messages */
1398 while (!list_empty(&session->s_cap_releases_done)) {
1399 msg = list_first_entry(&session->s_cap_releases_done,
1400 struct ceph_msg, list_head);
1401 list_del_init(&msg->list_head);
1402
1403 head = msg->front.iov_base;
1404 num = le32_to_cpu(head->num);
1405 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
1406 num);
1407 session->s_num_cap_releases += num;
1408 head->num = cpu_to_le32(0);
1409 msg->front.iov_len = sizeof(*head);
1410 list_add(&msg->list_head, &session->s_cap_releases);
1411 }
1412
1413 spin_unlock(&session->s_cap_lock);
1414 }
1415
1416 /*
1417 * requests
1418 */
1419
1420 /*
1421 * Create an mds request.
1422 */
1423 struct ceph_mds_request *
1424 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1425 {
1426 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1427
1428 if (!req)
1429 return ERR_PTR(-ENOMEM);
1430
1431 mutex_init(&req->r_fill_mutex);
1432 req->r_mdsc = mdsc;
1433 req->r_started = jiffies;
1434 req->r_resend_mds = -1;
1435 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1436 req->r_fmode = -1;
1437 kref_init(&req->r_kref);
1438 INIT_LIST_HEAD(&req->r_wait);
1439 init_completion(&req->r_completion);
1440 init_completion(&req->r_safe_completion);
1441 INIT_LIST_HEAD(&req->r_unsafe_item);
1442
1443 req->r_op = op;
1444 req->r_direct_mode = mode;
1445 return req;
1446 }
1447
1448 /*
1449 * return oldest (lowest) request, tid in request tree, 0 if none.
1450 *
1451 * called under mdsc->mutex.
1452 */
1453 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1454 {
1455 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1456 return NULL;
1457 return rb_entry(rb_first(&mdsc->request_tree),
1458 struct ceph_mds_request, r_node);
1459 }
1460
1461 static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1462 {
1463 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1464
1465 if (req)
1466 return req->r_tid;
1467 return 0;
1468 }
1469
1470 /*
1471 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1472 * on build_path_from_dentry in fs/cifs/dir.c.
1473 *
1474 * If @stop_on_nosnap, generate path relative to the first non-snapped
1475 * inode.
1476 *
1477 * Encode hidden .snap dirs as a double /, i.e.
1478 * foo/.snap/bar -> foo//bar
1479 */
1480 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1481 int stop_on_nosnap)
1482 {
1483 struct dentry *temp;
1484 char *path;
1485 int len, pos;
1486 unsigned seq;
1487
1488 if (dentry == NULL)
1489 return ERR_PTR(-EINVAL);
1490
1491 retry:
1492 len = 0;
1493 seq = read_seqbegin(&rename_lock);
1494 rcu_read_lock();
1495 for (temp = dentry; !IS_ROOT(temp);) {
1496 struct inode *inode = temp->d_inode;
1497 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1498 len++; /* slash only */
1499 else if (stop_on_nosnap && inode &&
1500 ceph_snap(inode) == CEPH_NOSNAP)
1501 break;
1502 else
1503 len += 1 + temp->d_name.len;
1504 temp = temp->d_parent;
1505 }
1506 rcu_read_unlock();
1507 if (len)
1508 len--; /* no leading '/' */
1509
1510 path = kmalloc(len+1, GFP_NOFS);
1511 if (path == NULL)
1512 return ERR_PTR(-ENOMEM);
1513 pos = len;
1514 path[pos] = 0; /* trailing null */
1515 rcu_read_lock();
1516 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1517 struct inode *inode;
1518
1519 spin_lock(&temp->d_lock);
1520 inode = temp->d_inode;
1521 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1522 dout("build_path path+%d: %p SNAPDIR\n",
1523 pos, temp);
1524 } else if (stop_on_nosnap && inode &&
1525 ceph_snap(inode) == CEPH_NOSNAP) {
1526 spin_unlock(&temp->d_lock);
1527 break;
1528 } else {
1529 pos -= temp->d_name.len;
1530 if (pos < 0) {
1531 spin_unlock(&temp->d_lock);
1532 break;
1533 }
1534 strncpy(path + pos, temp->d_name.name,
1535 temp->d_name.len);
1536 }
1537 spin_unlock(&temp->d_lock);
1538 if (pos)
1539 path[--pos] = '/';
1540 temp = temp->d_parent;
1541 }
1542 rcu_read_unlock();
1543 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1544 pr_err("build_path did not end path lookup where "
1545 "expected, namelen is %d, pos is %d\n", len, pos);
1546 /* presumably this is only possible if racing with a
1547 rename of one of the parent directories (we can not
1548 lock the dentries above us to prevent this, but
1549 retrying should be harmless) */
1550 kfree(path);
1551 goto retry;
1552 }
1553
1554 *base = ceph_ino(temp->d_inode);
1555 *plen = len;
1556 dout("build_path on %p %d built %llx '%.*s'\n",
1557 dentry, d_count(dentry), *base, len, path);
1558 return path;
1559 }
1560
1561 static int build_dentry_path(struct dentry *dentry,
1562 const char **ppath, int *ppathlen, u64 *pino,
1563 int *pfreepath)
1564 {
1565 char *path;
1566
1567 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1568 *pino = ceph_ino(dentry->d_parent->d_inode);
1569 *ppath = dentry->d_name.name;
1570 *ppathlen = dentry->d_name.len;
1571 return 0;
1572 }
1573 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1574 if (IS_ERR(path))
1575 return PTR_ERR(path);
1576 *ppath = path;
1577 *pfreepath = 1;
1578 return 0;
1579 }
1580
1581 static int build_inode_path(struct inode *inode,
1582 const char **ppath, int *ppathlen, u64 *pino,
1583 int *pfreepath)
1584 {
1585 struct dentry *dentry;
1586 char *path;
1587
1588 if (ceph_snap(inode) == CEPH_NOSNAP) {
1589 *pino = ceph_ino(inode);
1590 *ppathlen = 0;
1591 return 0;
1592 }
1593 dentry = d_find_alias(inode);
1594 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1595 dput(dentry);
1596 if (IS_ERR(path))
1597 return PTR_ERR(path);
1598 *ppath = path;
1599 *pfreepath = 1;
1600 return 0;
1601 }
1602
1603 /*
1604 * request arguments may be specified via an inode *, a dentry *, or
1605 * an explicit ino+path.
1606 */
1607 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1608 const char *rpath, u64 rino,
1609 const char **ppath, int *pathlen,
1610 u64 *ino, int *freepath)
1611 {
1612 int r = 0;
1613
1614 if (rinode) {
1615 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1616 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1617 ceph_snap(rinode));
1618 } else if (rdentry) {
1619 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1620 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1621 *ppath);
1622 } else if (rpath || rino) {
1623 *ino = rino;
1624 *ppath = rpath;
1625 *pathlen = rpath ? strlen(rpath) : 0;
1626 dout(" path %.*s\n", *pathlen, rpath);
1627 }
1628
1629 return r;
1630 }
1631
1632 /*
1633 * called under mdsc->mutex
1634 */
1635 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1636 struct ceph_mds_request *req,
1637 int mds)
1638 {
1639 struct ceph_msg *msg;
1640 struct ceph_mds_request_head *head;
1641 const char *path1 = NULL;
1642 const char *path2 = NULL;
1643 u64 ino1 = 0, ino2 = 0;
1644 int pathlen1 = 0, pathlen2 = 0;
1645 int freepath1 = 0, freepath2 = 0;
1646 int len;
1647 u16 releases;
1648 void *p, *end;
1649 int ret;
1650
1651 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1652 req->r_path1, req->r_ino1.ino,
1653 &path1, &pathlen1, &ino1, &freepath1);
1654 if (ret < 0) {
1655 msg = ERR_PTR(ret);
1656 goto out;
1657 }
1658
1659 ret = set_request_path_attr(NULL, req->r_old_dentry,
1660 req->r_path2, req->r_ino2.ino,
1661 &path2, &pathlen2, &ino2, &freepath2);
1662 if (ret < 0) {
1663 msg = ERR_PTR(ret);
1664 goto out_free1;
1665 }
1666
1667 len = sizeof(*head) +
1668 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
1669
1670 /* calculate (max) length for cap releases */
1671 len += sizeof(struct ceph_mds_request_release) *
1672 (!!req->r_inode_drop + !!req->r_dentry_drop +
1673 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1674 if (req->r_dentry_drop)
1675 len += req->r_dentry->d_name.len;
1676 if (req->r_old_dentry_drop)
1677 len += req->r_old_dentry->d_name.len;
1678
1679 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1680 if (!msg) {
1681 msg = ERR_PTR(-ENOMEM);
1682 goto out_free2;
1683 }
1684
1685 msg->hdr.tid = cpu_to_le64(req->r_tid);
1686
1687 head = msg->front.iov_base;
1688 p = msg->front.iov_base + sizeof(*head);
1689 end = msg->front.iov_base + msg->front.iov_len;
1690
1691 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1692 head->op = cpu_to_le32(req->r_op);
1693 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1694 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
1695 head->args = req->r_args;
1696
1697 ceph_encode_filepath(&p, end, ino1, path1);
1698 ceph_encode_filepath(&p, end, ino2, path2);
1699
1700 /* make note of release offset, in case we need to replay */
1701 req->r_request_release_offset = p - msg->front.iov_base;
1702
1703 /* cap releases */
1704 releases = 0;
1705 if (req->r_inode_drop)
1706 releases += ceph_encode_inode_release(&p,
1707 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1708 mds, req->r_inode_drop, req->r_inode_unless, 0);
1709 if (req->r_dentry_drop)
1710 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1711 mds, req->r_dentry_drop, req->r_dentry_unless);
1712 if (req->r_old_dentry_drop)
1713 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1714 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1715 if (req->r_old_inode_drop)
1716 releases += ceph_encode_inode_release(&p,
1717 req->r_old_dentry->d_inode,
1718 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1719 head->num_releases = cpu_to_le16(releases);
1720
1721 BUG_ON(p > end);
1722 msg->front.iov_len = p - msg->front.iov_base;
1723 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1724
1725 if (req->r_data_len) {
1726 /* outbound data set only by ceph_sync_setxattr() */
1727 BUG_ON(!req->r_pages);
1728 ceph_msg_data_add_pages(msg, req->r_pages, req->r_data_len, 0);
1729 }
1730
1731 msg->hdr.data_len = cpu_to_le32(req->r_data_len);
1732 msg->hdr.data_off = cpu_to_le16(0);
1733
1734 out_free2:
1735 if (freepath2)
1736 kfree((char *)path2);
1737 out_free1:
1738 if (freepath1)
1739 kfree((char *)path1);
1740 out:
1741 return msg;
1742 }
1743
1744 /*
1745 * called under mdsc->mutex if error, under no mutex if
1746 * success.
1747 */
1748 static void complete_request(struct ceph_mds_client *mdsc,
1749 struct ceph_mds_request *req)
1750 {
1751 if (req->r_callback)
1752 req->r_callback(mdsc, req);
1753 else
1754 complete_all(&req->r_completion);
1755 }
1756
1757 /*
1758 * called under mdsc->mutex
1759 */
1760 static int __prepare_send_request(struct ceph_mds_client *mdsc,
1761 struct ceph_mds_request *req,
1762 int mds)
1763 {
1764 struct ceph_mds_request_head *rhead;
1765 struct ceph_msg *msg;
1766 int flags = 0;
1767
1768 req->r_attempts++;
1769 if (req->r_inode) {
1770 struct ceph_cap *cap =
1771 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
1772
1773 if (cap)
1774 req->r_sent_on_mseq = cap->mseq;
1775 else
1776 req->r_sent_on_mseq = -1;
1777 }
1778 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
1779 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
1780
1781 if (req->r_got_unsafe) {
1782 /*
1783 * Replay. Do not regenerate message (and rebuild
1784 * paths, etc.); just use the original message.
1785 * Rebuilding paths will break for renames because
1786 * d_move mangles the src name.
1787 */
1788 msg = req->r_request;
1789 rhead = msg->front.iov_base;
1790
1791 flags = le32_to_cpu(rhead->flags);
1792 flags |= CEPH_MDS_FLAG_REPLAY;
1793 rhead->flags = cpu_to_le32(flags);
1794
1795 if (req->r_target_inode)
1796 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
1797
1798 rhead->num_retry = req->r_attempts - 1;
1799
1800 /* remove cap/dentry releases from message */
1801 rhead->num_releases = 0;
1802 msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset);
1803 msg->front.iov_len = req->r_request_release_offset;
1804 return 0;
1805 }
1806
1807 if (req->r_request) {
1808 ceph_msg_put(req->r_request);
1809 req->r_request = NULL;
1810 }
1811 msg = create_request_message(mdsc, req, mds);
1812 if (IS_ERR(msg)) {
1813 req->r_err = PTR_ERR(msg);
1814 complete_request(mdsc, req);
1815 return PTR_ERR(msg);
1816 }
1817 req->r_request = msg;
1818
1819 rhead = msg->front.iov_base;
1820 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
1821 if (req->r_got_unsafe)
1822 flags |= CEPH_MDS_FLAG_REPLAY;
1823 if (req->r_locked_dir)
1824 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
1825 rhead->flags = cpu_to_le32(flags);
1826 rhead->num_fwd = req->r_num_fwd;
1827 rhead->num_retry = req->r_attempts - 1;
1828 rhead->ino = 0;
1829
1830 dout(" r_locked_dir = %p\n", req->r_locked_dir);
1831 return 0;
1832 }
1833
1834 /*
1835 * send request, or put it on the appropriate wait list.
1836 */
1837 static int __do_request(struct ceph_mds_client *mdsc,
1838 struct ceph_mds_request *req)
1839 {
1840 struct ceph_mds_session *session = NULL;
1841 int mds = -1;
1842 int err = -EAGAIN;
1843
1844 if (req->r_err || req->r_got_result)
1845 goto out;
1846
1847 if (req->r_timeout &&
1848 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
1849 dout("do_request timed out\n");
1850 err = -EIO;
1851 goto finish;
1852 }
1853
1854 put_request_session(req);
1855
1856 mds = __choose_mds(mdsc, req);
1857 if (mds < 0 ||
1858 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
1859 dout("do_request no mds or not active, waiting for map\n");
1860 list_add(&req->r_wait, &mdsc->waiting_for_map);
1861 goto out;
1862 }
1863
1864 /* get, open session */
1865 session = __ceph_lookup_mds_session(mdsc, mds);
1866 if (!session) {
1867 session = register_session(mdsc, mds);
1868 if (IS_ERR(session)) {
1869 err = PTR_ERR(session);
1870 goto finish;
1871 }
1872 }
1873 req->r_session = get_session(session);
1874
1875 dout("do_request mds%d session %p state %s\n", mds, session,
1876 session_state_name(session->s_state));
1877 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
1878 session->s_state != CEPH_MDS_SESSION_HUNG) {
1879 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1880 session->s_state == CEPH_MDS_SESSION_CLOSING)
1881 __open_session(mdsc, session);
1882 list_add(&req->r_wait, &session->s_waiting);
1883 goto out_session;
1884 }
1885
1886 /* send request */
1887 req->r_resend_mds = -1; /* forget any previous mds hint */
1888
1889 if (req->r_request_started == 0) /* note request start time */
1890 req->r_request_started = jiffies;
1891
1892 err = __prepare_send_request(mdsc, req, mds);
1893 if (!err) {
1894 ceph_msg_get(req->r_request);
1895 ceph_con_send(&session->s_con, req->r_request);
1896 }
1897
1898 out_session:
1899 ceph_put_mds_session(session);
1900 out:
1901 return err;
1902
1903 finish:
1904 req->r_err = err;
1905 complete_request(mdsc, req);
1906 goto out;
1907 }
1908
1909 /*
1910 * called under mdsc->mutex
1911 */
1912 static void __wake_requests(struct ceph_mds_client *mdsc,
1913 struct list_head *head)
1914 {
1915 struct ceph_mds_request *req;
1916 LIST_HEAD(tmp_list);
1917
1918 list_splice_init(head, &tmp_list);
1919
1920 while (!list_empty(&tmp_list)) {
1921 req = list_entry(tmp_list.next,
1922 struct ceph_mds_request, r_wait);
1923 list_del_init(&req->r_wait);
1924 dout(" wake request %p tid %llu\n", req, req->r_tid);
1925 __do_request(mdsc, req);
1926 }
1927 }
1928
1929 /*
1930 * Wake up threads with requests pending for @mds, so that they can
1931 * resubmit their requests to a possibly different mds.
1932 */
1933 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
1934 {
1935 struct ceph_mds_request *req;
1936 struct rb_node *p;
1937
1938 dout("kick_requests mds%d\n", mds);
1939 for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
1940 req = rb_entry(p, struct ceph_mds_request, r_node);
1941 if (req->r_got_unsafe)
1942 continue;
1943 if (req->r_session &&
1944 req->r_session->s_mds == mds) {
1945 dout(" kicking tid %llu\n", req->r_tid);
1946 __do_request(mdsc, req);
1947 }
1948 }
1949 }
1950
1951 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
1952 struct ceph_mds_request *req)
1953 {
1954 dout("submit_request on %p\n", req);
1955 mutex_lock(&mdsc->mutex);
1956 __register_request(mdsc, req, NULL);
1957 __do_request(mdsc, req);
1958 mutex_unlock(&mdsc->mutex);
1959 }
1960
1961 /*
1962 * Synchrously perform an mds request. Take care of all of the
1963 * session setup, forwarding, retry details.
1964 */
1965 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
1966 struct inode *dir,
1967 struct ceph_mds_request *req)
1968 {
1969 int err;
1970
1971 dout("do_request on %p\n", req);
1972
1973 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
1974 if (req->r_inode)
1975 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
1976 if (req->r_locked_dir)
1977 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
1978 if (req->r_old_dentry)
1979 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
1980 CEPH_CAP_PIN);
1981
1982 /* issue */
1983 mutex_lock(&mdsc->mutex);
1984 __register_request(mdsc, req, dir);
1985 __do_request(mdsc, req);
1986
1987 if (req->r_err) {
1988 err = req->r_err;
1989 __unregister_request(mdsc, req);
1990 dout("do_request early error %d\n", err);
1991 goto out;
1992 }
1993
1994 /* wait */
1995 mutex_unlock(&mdsc->mutex);
1996 dout("do_request waiting\n");
1997 if (req->r_timeout) {
1998 err = (long)wait_for_completion_killable_timeout(
1999 &req->r_completion, req->r_timeout);
2000 if (err == 0)
2001 err = -EIO;
2002 } else {
2003 err = wait_for_completion_killable(&req->r_completion);
2004 }
2005 dout("do_request waited, got %d\n", err);
2006 mutex_lock(&mdsc->mutex);
2007
2008 /* only abort if we didn't race with a real reply */
2009 if (req->r_got_result) {
2010 err = le32_to_cpu(req->r_reply_info.head->result);
2011 } else if (err < 0) {
2012 dout("aborted request %lld with %d\n", req->r_tid, err);
2013
2014 /*
2015 * ensure we aren't running concurrently with
2016 * ceph_fill_trace or ceph_readdir_prepopulate, which
2017 * rely on locks (dir mutex) held by our caller.
2018 */
2019 mutex_lock(&req->r_fill_mutex);
2020 req->r_err = err;
2021 req->r_aborted = true;
2022 mutex_unlock(&req->r_fill_mutex);
2023
2024 if (req->r_locked_dir &&
2025 (req->r_op & CEPH_MDS_OP_WRITE))
2026 ceph_invalidate_dir_request(req);
2027 } else {
2028 err = req->r_err;
2029 }
2030
2031 out:
2032 mutex_unlock(&mdsc->mutex);
2033 dout("do_request %p done, result %d\n", req, err);
2034 return err;
2035 }
2036
2037 /*
2038 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2039 * namespace request.
2040 */
2041 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2042 {
2043 struct inode *inode = req->r_locked_dir;
2044
2045 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
2046
2047 ceph_dir_clear_complete(inode);
2048 if (req->r_dentry)
2049 ceph_invalidate_dentry_lease(req->r_dentry);
2050 if (req->r_old_dentry)
2051 ceph_invalidate_dentry_lease(req->r_old_dentry);
2052 }
2053
2054 /*
2055 * Handle mds reply.
2056 *
2057 * We take the session mutex and parse and process the reply immediately.
2058 * This preserves the logical ordering of replies, capabilities, etc., sent
2059 * by the MDS as they are applied to our local cache.
2060 */
2061 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2062 {
2063 struct ceph_mds_client *mdsc = session->s_mdsc;
2064 struct ceph_mds_request *req;
2065 struct ceph_mds_reply_head *head = msg->front.iov_base;
2066 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2067 u64 tid;
2068 int err, result;
2069 int mds = session->s_mds;
2070
2071 if (msg->front.iov_len < sizeof(*head)) {
2072 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2073 ceph_msg_dump(msg);
2074 return;
2075 }
2076
2077 /* get request, session */
2078 tid = le64_to_cpu(msg->hdr.tid);
2079 mutex_lock(&mdsc->mutex);
2080 req = __lookup_request(mdsc, tid);
2081 if (!req) {
2082 dout("handle_reply on unknown tid %llu\n", tid);
2083 mutex_unlock(&mdsc->mutex);
2084 return;
2085 }
2086 dout("handle_reply %p\n", req);
2087
2088 /* correct session? */
2089 if (req->r_session != session) {
2090 pr_err("mdsc_handle_reply got %llu on session mds%d"
2091 " not mds%d\n", tid, session->s_mds,
2092 req->r_session ? req->r_session->s_mds : -1);
2093 mutex_unlock(&mdsc->mutex);
2094 goto out;
2095 }
2096
2097 /* dup? */
2098 if ((req->r_got_unsafe && !head->safe) ||
2099 (req->r_got_safe && head->safe)) {
2100 pr_warning("got a dup %s reply on %llu from mds%d\n",
2101 head->safe ? "safe" : "unsafe", tid, mds);
2102 mutex_unlock(&mdsc->mutex);
2103 goto out;
2104 }
2105 if (req->r_got_safe && !head->safe) {
2106 pr_warning("got unsafe after safe on %llu from mds%d\n",
2107 tid, mds);
2108 mutex_unlock(&mdsc->mutex);
2109 goto out;
2110 }
2111
2112 result = le32_to_cpu(head->result);
2113
2114 /*
2115 * Handle an ESTALE
2116 * if we're not talking to the authority, send to them
2117 * if the authority has changed while we weren't looking,
2118 * send to new authority
2119 * Otherwise we just have to return an ESTALE
2120 */
2121 if (result == -ESTALE) {
2122 dout("got ESTALE on request %llu", req->r_tid);
2123 if (!req->r_inode) {
2124 /* do nothing; not an authority problem */
2125 } else if (req->r_direct_mode != USE_AUTH_MDS) {
2126 dout("not using auth, setting for that now");
2127 req->r_direct_mode = USE_AUTH_MDS;
2128 __do_request(mdsc, req);
2129 mutex_unlock(&mdsc->mutex);
2130 goto out;
2131 } else {
2132 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
2133 struct ceph_cap *cap = NULL;
2134
2135 if (req->r_session)
2136 cap = ceph_get_cap_for_mds(ci,
2137 req->r_session->s_mds);
2138
2139 dout("already using auth");
2140 if ((!cap || cap != ci->i_auth_cap) ||
2141 (cap->mseq != req->r_sent_on_mseq)) {
2142 dout("but cap changed, so resending");
2143 __do_request(mdsc, req);
2144 mutex_unlock(&mdsc->mutex);
2145 goto out;
2146 }
2147 }
2148 dout("have to return ESTALE on request %llu", req->r_tid);
2149 }
2150
2151
2152 if (head->safe) {
2153 req->r_got_safe = true;
2154 __unregister_request(mdsc, req);
2155 complete_all(&req->r_safe_completion);
2156
2157 if (req->r_got_unsafe) {
2158 /*
2159 * We already handled the unsafe response, now do the
2160 * cleanup. No need to examine the response; the MDS
2161 * doesn't include any result info in the safe
2162 * response. And even if it did, there is nothing
2163 * useful we could do with a revised return value.
2164 */
2165 dout("got safe reply %llu, mds%d\n", tid, mds);
2166 list_del_init(&req->r_unsafe_item);
2167
2168 /* last unsafe request during umount? */
2169 if (mdsc->stopping && !__get_oldest_req(mdsc))
2170 complete_all(&mdsc->safe_umount_waiters);
2171 mutex_unlock(&mdsc->mutex);
2172 goto out;
2173 }
2174 } else {
2175 req->r_got_unsafe = true;
2176 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2177 }
2178
2179 dout("handle_reply tid %lld result %d\n", tid, result);
2180 rinfo = &req->r_reply_info;
2181 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2182 mutex_unlock(&mdsc->mutex);
2183
2184 mutex_lock(&session->s_mutex);
2185 if (err < 0) {
2186 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2187 ceph_msg_dump(msg);
2188 goto out_err;
2189 }
2190
2191 /* snap trace */
2192 if (rinfo->snapblob_len) {
2193 down_write(&mdsc->snap_rwsem);
2194 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2195 rinfo->snapblob + rinfo->snapblob_len,
2196 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
2197 downgrade_write(&mdsc->snap_rwsem);
2198 } else {
2199 down_read(&mdsc->snap_rwsem);
2200 }
2201
2202 /* insert trace into our cache */
2203 mutex_lock(&req->r_fill_mutex);
2204 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2205 if (err == 0) {
2206 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2207 req->r_op == CEPH_MDS_OP_LSSNAP) &&
2208 rinfo->dir_nr)
2209 ceph_readdir_prepopulate(req, req->r_session);
2210 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2211 }
2212 mutex_unlock(&req->r_fill_mutex);
2213
2214 up_read(&mdsc->snap_rwsem);
2215 out_err:
2216 mutex_lock(&mdsc->mutex);
2217 if (!req->r_aborted) {
2218 if (err) {
2219 req->r_err = err;
2220 } else {
2221 req->r_reply = msg;
2222 ceph_msg_get(msg);
2223 req->r_got_result = true;
2224 }
2225 } else {
2226 dout("reply arrived after request %lld was aborted\n", tid);
2227 }
2228 mutex_unlock(&mdsc->mutex);
2229
2230 ceph_add_cap_releases(mdsc, req->r_session);
2231 mutex_unlock(&session->s_mutex);
2232
2233 /* kick calling process */
2234 complete_request(mdsc, req);
2235 out:
2236 ceph_mdsc_put_request(req);
2237 return;
2238 }
2239
2240
2241
2242 /*
2243 * handle mds notification that our request has been forwarded.
2244 */
2245 static void handle_forward(struct ceph_mds_client *mdsc,
2246 struct ceph_mds_session *session,
2247 struct ceph_msg *msg)
2248 {
2249 struct ceph_mds_request *req;
2250 u64 tid = le64_to_cpu(msg->hdr.tid);
2251 u32 next_mds;
2252 u32 fwd_seq;
2253 int err = -EINVAL;
2254 void *p = msg->front.iov_base;
2255 void *end = p + msg->front.iov_len;
2256
2257 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2258 next_mds = ceph_decode_32(&p);
2259 fwd_seq = ceph_decode_32(&p);
2260
2261 mutex_lock(&mdsc->mutex);
2262 req = __lookup_request(mdsc, tid);
2263 if (!req) {
2264 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2265 goto out; /* dup reply? */
2266 }
2267
2268 if (req->r_aborted) {
2269 dout("forward tid %llu aborted, unregistering\n", tid);
2270 __unregister_request(mdsc, req);
2271 } else if (fwd_seq <= req->r_num_fwd) {
2272 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2273 tid, next_mds, req->r_num_fwd, fwd_seq);
2274 } else {
2275 /* resend. forward race not possible; mds would drop */
2276 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2277 BUG_ON(req->r_err);
2278 BUG_ON(req->r_got_result);
2279 req->r_num_fwd = fwd_seq;
2280 req->r_resend_mds = next_mds;
2281 put_request_session(req);
2282 __do_request(mdsc, req);
2283 }
2284 ceph_mdsc_put_request(req);
2285 out:
2286 mutex_unlock(&mdsc->mutex);
2287 return;
2288
2289 bad:
2290 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2291 }
2292
2293 /*
2294 * handle a mds session control message
2295 */
2296 static void handle_session(struct ceph_mds_session *session,
2297 struct ceph_msg *msg)
2298 {
2299 struct ceph_mds_client *mdsc = session->s_mdsc;
2300 u32 op;
2301 u64 seq;
2302 int mds = session->s_mds;
2303 struct ceph_mds_session_head *h = msg->front.iov_base;
2304 int wake = 0;
2305
2306 /* decode */
2307 if (msg->front.iov_len != sizeof(*h))
2308 goto bad;
2309 op = le32_to_cpu(h->op);
2310 seq = le64_to_cpu(h->seq);
2311
2312 mutex_lock(&mdsc->mutex);
2313 if (op == CEPH_SESSION_CLOSE)
2314 __unregister_session(mdsc, session);
2315 /* FIXME: this ttl calculation is generous */
2316 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2317 mutex_unlock(&mdsc->mutex);
2318
2319 mutex_lock(&session->s_mutex);
2320
2321 dout("handle_session mds%d %s %p state %s seq %llu\n",
2322 mds, ceph_session_op_name(op), session,
2323 session_state_name(session->s_state), seq);
2324
2325 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2326 session->s_state = CEPH_MDS_SESSION_OPEN;
2327 pr_info("mds%d came back\n", session->s_mds);
2328 }
2329
2330 switch (op) {
2331 case CEPH_SESSION_OPEN:
2332 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2333 pr_info("mds%d reconnect success\n", session->s_mds);
2334 session->s_state = CEPH_MDS_SESSION_OPEN;
2335 renewed_caps(mdsc, session, 0);
2336 wake = 1;
2337 if (mdsc->stopping)
2338 __close_session(mdsc, session);
2339 break;
2340
2341 case CEPH_SESSION_RENEWCAPS:
2342 if (session->s_renew_seq == seq)
2343 renewed_caps(mdsc, session, 1);
2344 break;
2345
2346 case CEPH_SESSION_CLOSE:
2347 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2348 pr_info("mds%d reconnect denied\n", session->s_mds);
2349 remove_session_caps(session);
2350 wake = 1; /* for good measure */
2351 wake_up_all(&mdsc->session_close_wq);
2352 kick_requests(mdsc, mds);
2353 break;
2354
2355 case CEPH_SESSION_STALE:
2356 pr_info("mds%d caps went stale, renewing\n",
2357 session->s_mds);
2358 spin_lock(&session->s_gen_ttl_lock);
2359 session->s_cap_gen++;
2360 session->s_cap_ttl = jiffies - 1;
2361 spin_unlock(&session->s_gen_ttl_lock);
2362 send_renew_caps(mdsc, session);
2363 break;
2364
2365 case CEPH_SESSION_RECALL_STATE:
2366 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2367 break;
2368
2369 default:
2370 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2371 WARN_ON(1);
2372 }
2373
2374 mutex_unlock(&session->s_mutex);
2375 if (wake) {
2376 mutex_lock(&mdsc->mutex);
2377 __wake_requests(mdsc, &session->s_waiting);
2378 mutex_unlock(&mdsc->mutex);
2379 }
2380 return;
2381
2382 bad:
2383 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2384 (int)msg->front.iov_len);
2385 ceph_msg_dump(msg);
2386 return;
2387 }
2388
2389
2390 /*
2391 * called under session->mutex.
2392 */
2393 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2394 struct ceph_mds_session *session)
2395 {
2396 struct ceph_mds_request *req, *nreq;
2397 int err;
2398
2399 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2400
2401 mutex_lock(&mdsc->mutex);
2402 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2403 err = __prepare_send_request(mdsc, req, session->s_mds);
2404 if (!err) {
2405 ceph_msg_get(req->r_request);
2406 ceph_con_send(&session->s_con, req->r_request);
2407 }
2408 }
2409 mutex_unlock(&mdsc->mutex);
2410 }
2411
2412 /*
2413 * Encode information about a cap for a reconnect with the MDS.
2414 */
2415 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2416 void *arg)
2417 {
2418 union {
2419 struct ceph_mds_cap_reconnect v2;
2420 struct ceph_mds_cap_reconnect_v1 v1;
2421 } rec;
2422 size_t reclen;
2423 struct ceph_inode_info *ci;
2424 struct ceph_reconnect_state *recon_state = arg;
2425 struct ceph_pagelist *pagelist = recon_state->pagelist;
2426 char *path;
2427 int pathlen, err;
2428 u64 pathbase;
2429 struct dentry *dentry;
2430
2431 ci = cap->ci;
2432
2433 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2434 inode, ceph_vinop(inode), cap, cap->cap_id,
2435 ceph_cap_string(cap->issued));
2436 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2437 if (err)
2438 return err;
2439
2440 dentry = d_find_alias(inode);
2441 if (dentry) {
2442 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2443 if (IS_ERR(path)) {
2444 err = PTR_ERR(path);
2445 goto out_dput;
2446 }
2447 } else {
2448 path = NULL;
2449 pathlen = 0;
2450 }
2451 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2452 if (err)
2453 goto out_free;
2454
2455 spin_lock(&ci->i_ceph_lock);
2456 cap->seq = 0; /* reset cap seq */
2457 cap->issue_seq = 0; /* and issue_seq */
2458 cap->mseq = 0; /* and migrate_seq */
2459
2460 if (recon_state->flock) {
2461 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2462 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2463 rec.v2.issued = cpu_to_le32(cap->issued);
2464 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2465 rec.v2.pathbase = cpu_to_le64(pathbase);
2466 rec.v2.flock_len = 0;
2467 reclen = sizeof(rec.v2);
2468 } else {
2469 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2470 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2471 rec.v1.issued = cpu_to_le32(cap->issued);
2472 rec.v1.size = cpu_to_le64(inode->i_size);
2473 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2474 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2475 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2476 rec.v1.pathbase = cpu_to_le64(pathbase);
2477 reclen = sizeof(rec.v1);
2478 }
2479 spin_unlock(&ci->i_ceph_lock);
2480
2481 if (recon_state->flock) {
2482 int num_fcntl_locks, num_flock_locks;
2483 struct ceph_filelock *flocks;
2484
2485 encode_again:
2486 spin_lock(&inode->i_lock);
2487 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
2488 spin_unlock(&inode->i_lock);
2489 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2490 sizeof(struct ceph_filelock), GFP_NOFS);
2491 if (!flocks) {
2492 err = -ENOMEM;
2493 goto out_free;
2494 }
2495 spin_lock(&inode->i_lock);
2496 err = ceph_encode_locks_to_buffer(inode, flocks,
2497 num_fcntl_locks,
2498 num_flock_locks);
2499 spin_unlock(&inode->i_lock);
2500 if (err) {
2501 kfree(flocks);
2502 if (err == -ENOSPC)
2503 goto encode_again;
2504 goto out_free;
2505 }
2506 /*
2507 * number of encoded locks is stable, so copy to pagelist
2508 */
2509 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
2510 (num_fcntl_locks+num_flock_locks) *
2511 sizeof(struct ceph_filelock));
2512 err = ceph_pagelist_append(pagelist, &rec, reclen);
2513 if (!err)
2514 err = ceph_locks_to_pagelist(flocks, pagelist,
2515 num_fcntl_locks,
2516 num_flock_locks);
2517 kfree(flocks);
2518 } else {
2519 err = ceph_pagelist_append(pagelist, &rec, reclen);
2520 }
2521 out_free:
2522 kfree(path);
2523 out_dput:
2524 dput(dentry);
2525 return err;
2526 }
2527
2528
2529 /*
2530 * If an MDS fails and recovers, clients need to reconnect in order to
2531 * reestablish shared state. This includes all caps issued through
2532 * this session _and_ the snap_realm hierarchy. Because it's not
2533 * clear which snap realms the mds cares about, we send everything we
2534 * know about.. that ensures we'll then get any new info the
2535 * recovering MDS might have.
2536 *
2537 * This is a relatively heavyweight operation, but it's rare.
2538 *
2539 * called with mdsc->mutex held.
2540 */
2541 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2542 struct ceph_mds_session *session)
2543 {
2544 struct ceph_msg *reply;
2545 struct rb_node *p;
2546 int mds = session->s_mds;
2547 int err = -ENOMEM;
2548 struct ceph_pagelist *pagelist;
2549 struct ceph_reconnect_state recon_state;
2550
2551 pr_info("mds%d reconnect start\n", mds);
2552
2553 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2554 if (!pagelist)
2555 goto fail_nopagelist;
2556 ceph_pagelist_init(pagelist);
2557
2558 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
2559 if (!reply)
2560 goto fail_nomsg;
2561
2562 mutex_lock(&session->s_mutex);
2563 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2564 session->s_seq = 0;
2565
2566 ceph_con_close(&session->s_con);
2567 ceph_con_open(&session->s_con,
2568 CEPH_ENTITY_TYPE_MDS, mds,
2569 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2570
2571 /* replay unsafe requests */
2572 replay_unsafe_requests(mdsc, session);
2573
2574 down_read(&mdsc->snap_rwsem);
2575
2576 dout("session %p state %s\n", session,
2577 session_state_name(session->s_state));
2578
2579 /* drop old cap expires; we're about to reestablish that state */
2580 discard_cap_releases(mdsc, session);
2581
2582 /* traverse this session's caps */
2583 err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps);
2584 if (err)
2585 goto fail;
2586
2587 recon_state.pagelist = pagelist;
2588 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2589 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2590 if (err < 0)
2591 goto fail;
2592
2593 /*
2594 * snaprealms. we provide mds with the ino, seq (version), and
2595 * parent for all of our realms. If the mds has any newer info,
2596 * it will tell us.
2597 */
2598 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2599 struct ceph_snap_realm *realm =
2600 rb_entry(p, struct ceph_snap_realm, node);
2601 struct ceph_mds_snaprealm_reconnect sr_rec;
2602
2603 dout(" adding snap realm %llx seq %lld parent %llx\n",
2604 realm->ino, realm->seq, realm->parent_ino);
2605 sr_rec.ino = cpu_to_le64(realm->ino);
2606 sr_rec.seq = cpu_to_le64(realm->seq);
2607 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2608 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2609 if (err)
2610 goto fail;
2611 }
2612
2613 if (recon_state.flock)
2614 reply->hdr.version = cpu_to_le16(2);
2615 if (pagelist->length) {
2616 /* set up outbound data if we have any */
2617 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2618 ceph_msg_data_add_pagelist(reply, pagelist);
2619 }
2620 ceph_con_send(&session->s_con, reply);
2621
2622 mutex_unlock(&session->s_mutex);
2623
2624 mutex_lock(&mdsc->mutex);
2625 __wake_requests(mdsc, &session->s_waiting);
2626 mutex_unlock(&mdsc->mutex);
2627
2628 up_read(&mdsc->snap_rwsem);
2629 return;
2630
2631 fail:
2632 ceph_msg_put(reply);
2633 up_read(&mdsc->snap_rwsem);
2634 mutex_unlock(&session->s_mutex);
2635 fail_nomsg:
2636 ceph_pagelist_release(pagelist);
2637 kfree(pagelist);
2638 fail_nopagelist:
2639 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
2640 return;
2641 }
2642
2643
2644 /*
2645 * compare old and new mdsmaps, kicking requests
2646 * and closing out old connections as necessary
2647 *
2648 * called under mdsc->mutex.
2649 */
2650 static void check_new_map(struct ceph_mds_client *mdsc,
2651 struct ceph_mdsmap *newmap,
2652 struct ceph_mdsmap *oldmap)
2653 {
2654 int i;
2655 int oldstate, newstate;
2656 struct ceph_mds_session *s;
2657
2658 dout("check_new_map new %u old %u\n",
2659 newmap->m_epoch, oldmap->m_epoch);
2660
2661 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2662 if (mdsc->sessions[i] == NULL)
2663 continue;
2664 s = mdsc->sessions[i];
2665 oldstate = ceph_mdsmap_get_state(oldmap, i);
2666 newstate = ceph_mdsmap_get_state(newmap, i);
2667
2668 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2669 i, ceph_mds_state_name(oldstate),
2670 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2671 ceph_mds_state_name(newstate),
2672 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
2673 session_state_name(s->s_state));
2674
2675 if (i >= newmap->m_max_mds ||
2676 memcmp(ceph_mdsmap_get_addr(oldmap, i),
2677 ceph_mdsmap_get_addr(newmap, i),
2678 sizeof(struct ceph_entity_addr))) {
2679 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2680 /* the session never opened, just close it
2681 * out now */
2682 __wake_requests(mdsc, &s->s_waiting);
2683 __unregister_session(mdsc, s);
2684 } else {
2685 /* just close it */
2686 mutex_unlock(&mdsc->mutex);
2687 mutex_lock(&s->s_mutex);
2688 mutex_lock(&mdsc->mutex);
2689 ceph_con_close(&s->s_con);
2690 mutex_unlock(&s->s_mutex);
2691 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2692 }
2693
2694 /* kick any requests waiting on the recovering mds */
2695 kick_requests(mdsc, i);
2696 } else if (oldstate == newstate) {
2697 continue; /* nothing new with this mds */
2698 }
2699
2700 /*
2701 * send reconnect?
2702 */
2703 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
2704 newstate >= CEPH_MDS_STATE_RECONNECT) {
2705 mutex_unlock(&mdsc->mutex);
2706 send_mds_reconnect(mdsc, s);
2707 mutex_lock(&mdsc->mutex);
2708 }
2709
2710 /*
2711 * kick request on any mds that has gone active.
2712 */
2713 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
2714 newstate >= CEPH_MDS_STATE_ACTIVE) {
2715 if (oldstate != CEPH_MDS_STATE_CREATING &&
2716 oldstate != CEPH_MDS_STATE_STARTING)
2717 pr_info("mds%d recovery completed\n", s->s_mds);
2718 kick_requests(mdsc, i);
2719 ceph_kick_flushing_caps(mdsc, s);
2720 wake_up_session_caps(s, 1);
2721 }
2722 }
2723
2724 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
2725 s = mdsc->sessions[i];
2726 if (!s)
2727 continue;
2728 if (!ceph_mdsmap_is_laggy(newmap, i))
2729 continue;
2730 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2731 s->s_state == CEPH_MDS_SESSION_HUNG ||
2732 s->s_state == CEPH_MDS_SESSION_CLOSING) {
2733 dout(" connecting to export targets of laggy mds%d\n",
2734 i);
2735 __open_export_target_sessions(mdsc, s);
2736 }
2737 }
2738 }
2739
2740
2741
2742 /*
2743 * leases
2744 */
2745
2746 /*
2747 * caller must hold session s_mutex, dentry->d_lock
2748 */
2749 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
2750 {
2751 struct ceph_dentry_info *di = ceph_dentry(dentry);
2752
2753 ceph_put_mds_session(di->lease_session);
2754 di->lease_session = NULL;
2755 }
2756
2757 static void handle_lease(struct ceph_mds_client *mdsc,
2758 struct ceph_mds_session *session,
2759 struct ceph_msg *msg)
2760 {
2761 struct super_block *sb = mdsc->fsc->sb;
2762 struct inode *inode;
2763 struct dentry *parent, *dentry;
2764 struct ceph_dentry_info *di;
2765 int mds = session->s_mds;
2766 struct ceph_mds_lease *h = msg->front.iov_base;
2767 u32 seq;
2768 struct ceph_vino vino;
2769 struct qstr dname;
2770 int release = 0;
2771
2772 dout("handle_lease from mds%d\n", mds);
2773
2774 /* decode */
2775 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
2776 goto bad;
2777 vino.ino = le64_to_cpu(h->ino);
2778 vino.snap = CEPH_NOSNAP;
2779 seq = le32_to_cpu(h->seq);
2780 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
2781 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
2782 if (dname.len != get_unaligned_le32(h+1))
2783 goto bad;
2784
2785 mutex_lock(&session->s_mutex);
2786 session->s_seq++;
2787
2788 /* lookup inode */
2789 inode = ceph_find_inode(sb, vino);
2790 dout("handle_lease %s, ino %llx %p %.*s\n",
2791 ceph_lease_op_name(h->action), vino.ino, inode,
2792 dname.len, dname.name);
2793 if (inode == NULL) {
2794 dout("handle_lease no inode %llx\n", vino.ino);
2795 goto release;
2796 }
2797
2798 /* dentry */
2799 parent = d_find_alias(inode);
2800 if (!parent) {
2801 dout("no parent dentry on inode %p\n", inode);
2802 WARN_ON(1);
2803 goto release; /* hrm... */
2804 }
2805 dname.hash = full_name_hash(dname.name, dname.len);
2806 dentry = d_lookup(parent, &dname);
2807 dput(parent);
2808 if (!dentry)
2809 goto release;
2810
2811 spin_lock(&dentry->d_lock);
2812 di = ceph_dentry(dentry);
2813 switch (h->action) {
2814 case CEPH_MDS_LEASE_REVOKE:
2815 if (di->lease_session == session) {
2816 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
2817 h->seq = cpu_to_le32(di->lease_seq);
2818 __ceph_mdsc_drop_dentry_lease(dentry);
2819 }
2820 release = 1;
2821 break;
2822
2823 case CEPH_MDS_LEASE_RENEW:
2824 if (di->lease_session == session &&
2825 di->lease_gen == session->s_cap_gen &&
2826 di->lease_renew_from &&
2827 di->lease_renew_after == 0) {
2828 unsigned long duration =
2829 le32_to_cpu(h->duration_ms) * HZ / 1000;
2830
2831 di->lease_seq = seq;
2832 dentry->d_time = di->lease_renew_from + duration;
2833 di->lease_renew_after = di->lease_renew_from +
2834 (duration >> 1);
2835 di->lease_renew_from = 0;
2836 }
2837 break;
2838 }
2839 spin_unlock(&dentry->d_lock);
2840 dput(dentry);
2841
2842 if (!release)
2843 goto out;
2844
2845 release:
2846 /* let's just reuse the same message */
2847 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
2848 ceph_msg_get(msg);
2849 ceph_con_send(&session->s_con, msg);
2850
2851 out:
2852 iput(inode);
2853 mutex_unlock(&session->s_mutex);
2854 return;
2855
2856 bad:
2857 pr_err("corrupt lease message\n");
2858 ceph_msg_dump(msg);
2859 }
2860
2861 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2862 struct inode *inode,
2863 struct dentry *dentry, char action,
2864 u32 seq)
2865 {
2866 struct ceph_msg *msg;
2867 struct ceph_mds_lease *lease;
2868 int len = sizeof(*lease) + sizeof(u32);
2869 int dnamelen = 0;
2870
2871 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2872 inode, dentry, ceph_lease_op_name(action), session->s_mds);
2873 dnamelen = dentry->d_name.len;
2874 len += dnamelen;
2875
2876 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
2877 if (!msg)
2878 return;
2879 lease = msg->front.iov_base;
2880 lease->action = action;
2881 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
2882 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
2883 lease->seq = cpu_to_le32(seq);
2884 put_unaligned_le32(dnamelen, lease + 1);
2885 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
2886
2887 /*
2888 * if this is a preemptive lease RELEASE, no need to
2889 * flush request stream, since the actual request will
2890 * soon follow.
2891 */
2892 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
2893
2894 ceph_con_send(&session->s_con, msg);
2895 }
2896
2897 /*
2898 * Preemptively release a lease we expect to invalidate anyway.
2899 * Pass @inode always, @dentry is optional.
2900 */
2901 void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2902 struct dentry *dentry)
2903 {
2904 struct ceph_dentry_info *di;
2905 struct ceph_mds_session *session;
2906 u32 seq;
2907
2908 BUG_ON(inode == NULL);
2909 BUG_ON(dentry == NULL);
2910
2911 /* is dentry lease valid? */
2912 spin_lock(&dentry->d_lock);
2913 di = ceph_dentry(dentry);
2914 if (!di || !di->lease_session ||
2915 di->lease_session->s_mds < 0 ||
2916 di->lease_gen != di->lease_session->s_cap_gen ||
2917 !time_before(jiffies, dentry->d_time)) {
2918 dout("lease_release inode %p dentry %p -- "
2919 "no lease\n",
2920 inode, dentry);
2921 spin_unlock(&dentry->d_lock);
2922 return;
2923 }
2924
2925 /* we do have a lease on this dentry; note mds and seq */
2926 session = ceph_get_mds_session(di->lease_session);
2927 seq = di->lease_seq;
2928 __ceph_mdsc_drop_dentry_lease(dentry);
2929 spin_unlock(&dentry->d_lock);
2930
2931 dout("lease_release inode %p dentry %p to mds%d\n",
2932 inode, dentry, session->s_mds);
2933 ceph_mdsc_lease_send_msg(session, inode, dentry,
2934 CEPH_MDS_LEASE_RELEASE, seq);
2935 ceph_put_mds_session(session);
2936 }
2937
2938 /*
2939 * drop all leases (and dentry refs) in preparation for umount
2940 */
2941 static void drop_leases(struct ceph_mds_client *mdsc)
2942 {
2943 int i;
2944
2945 dout("drop_leases\n");
2946 mutex_lock(&mdsc->mutex);
2947 for (i = 0; i < mdsc->max_sessions; i++) {
2948 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2949 if (!s)
2950 continue;
2951 mutex_unlock(&mdsc->mutex);
2952 mutex_lock(&s->s_mutex);
2953 mutex_unlock(&s->s_mutex);
2954 ceph_put_mds_session(s);
2955 mutex_lock(&mdsc->mutex);
2956 }
2957 mutex_unlock(&mdsc->mutex);
2958 }
2959
2960
2961
2962 /*
2963 * delayed work -- periodically trim expired leases, renew caps with mds
2964 */
2965 static void schedule_delayed(struct ceph_mds_client *mdsc)
2966 {
2967 int delay = 5;
2968 unsigned hz = round_jiffies_relative(HZ * delay);
2969 schedule_delayed_work(&mdsc->delayed_work, hz);
2970 }
2971
2972 static void delayed_work(struct work_struct *work)
2973 {
2974 int i;
2975 struct ceph_mds_client *mdsc =
2976 container_of(work, struct ceph_mds_client, delayed_work.work);
2977 int renew_interval;
2978 int renew_caps;
2979
2980 dout("mdsc delayed_work\n");
2981 ceph_check_delayed_caps(mdsc);
2982
2983 mutex_lock(&mdsc->mutex);
2984 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
2985 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
2986 mdsc->last_renew_caps);
2987 if (renew_caps)
2988 mdsc->last_renew_caps = jiffies;
2989
2990 for (i = 0; i < mdsc->max_sessions; i++) {
2991 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2992 if (s == NULL)
2993 continue;
2994 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
2995 dout("resending session close request for mds%d\n",
2996 s->s_mds);
2997 request_close_session(mdsc, s);
2998 ceph_put_mds_session(s);
2999 continue;
3000 }
3001 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3002 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3003 s->s_state = CEPH_MDS_SESSION_HUNG;
3004 pr_info("mds%d hung\n", s->s_mds);
3005 }
3006 }
3007 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3008 /* this mds is failed or recovering, just wait */
3009 ceph_put_mds_session(s);
3010 continue;
3011 }
3012 mutex_unlock(&mdsc->mutex);
3013
3014 mutex_lock(&s->s_mutex);
3015 if (renew_caps)
3016 send_renew_caps(mdsc, s);
3017 else
3018 ceph_con_keepalive(&s->s_con);
3019 ceph_add_cap_releases(mdsc, s);
3020 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3021 s->s_state == CEPH_MDS_SESSION_HUNG)
3022 ceph_send_cap_releases(mdsc, s);
3023 mutex_unlock(&s->s_mutex);
3024 ceph_put_mds_session(s);
3025
3026 mutex_lock(&mdsc->mutex);
3027 }
3028 mutex_unlock(&mdsc->mutex);
3029
3030 schedule_delayed(mdsc);
3031 }
3032
3033 int ceph_mdsc_init(struct ceph_fs_client *fsc)
3034
3035 {
3036 struct ceph_mds_client *mdsc;
3037
3038 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3039 if (!mdsc)
3040 return -ENOMEM;
3041 mdsc->fsc = fsc;
3042 fsc->mdsc = mdsc;
3043 mutex_init(&mdsc->mutex);
3044 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3045 if (mdsc->mdsmap == NULL) {
3046 kfree(mdsc);
3047 return -ENOMEM;
3048 }
3049
3050 init_completion(&mdsc->safe_umount_waiters);
3051 init_waitqueue_head(&mdsc->session_close_wq);
3052 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3053 mdsc->sessions = NULL;
3054 mdsc->max_sessions = 0;
3055 mdsc->stopping = 0;
3056 init_rwsem(&mdsc->snap_rwsem);
3057 mdsc->snap_realms = RB_ROOT;
3058 INIT_LIST_HEAD(&mdsc->snap_empty);
3059 spin_lock_init(&mdsc->snap_empty_lock);
3060 mdsc->last_tid = 0;
3061 mdsc->request_tree = RB_ROOT;
3062 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3063 mdsc->last_renew_caps = jiffies;
3064 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3065 spin_lock_init(&mdsc->cap_delay_lock);
3066 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3067 spin_lock_init(&mdsc->snap_flush_lock);
3068 mdsc->cap_flush_seq = 0;
3069 INIT_LIST_HEAD(&mdsc->cap_dirty);
3070 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3071 mdsc->num_cap_flushing = 0;
3072 spin_lock_init(&mdsc->cap_dirty_lock);
3073 init_waitqueue_head(&mdsc->cap_flushing_wq);
3074 spin_lock_init(&mdsc->dentry_lru_lock);
3075 INIT_LIST_HEAD(&mdsc->dentry_lru);
3076
3077 ceph_caps_init(mdsc);
3078 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3079
3080 return 0;
3081 }
3082
3083 /*
3084 * Wait for safe replies on open mds requests. If we time out, drop
3085 * all requests from the tree to avoid dangling dentry refs.
3086 */
3087 static void wait_requests(struct ceph_mds_client *mdsc)
3088 {
3089 struct ceph_mds_request *req;
3090 struct ceph_fs_client *fsc = mdsc->fsc;
3091
3092 mutex_lock(&mdsc->mutex);
3093 if (__get_oldest_req(mdsc)) {
3094 mutex_unlock(&mdsc->mutex);
3095
3096 dout("wait_requests waiting for requests\n");
3097 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3098 fsc->client->options->mount_timeout * HZ);
3099
3100 /* tear down remaining requests */
3101 mutex_lock(&mdsc->mutex);
3102 while ((req = __get_oldest_req(mdsc))) {
3103 dout("wait_requests timed out on tid %llu\n",
3104 req->r_tid);
3105 __unregister_request(mdsc, req);
3106 }
3107 }
3108 mutex_unlock(&mdsc->mutex);
3109 dout("wait_requests done\n");
3110 }
3111
3112 /*
3113 * called before mount is ro, and before dentries are torn down.
3114 * (hmm, does this still race with new lookups?)
3115 */
3116 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3117 {
3118 dout("pre_umount\n");
3119 mdsc->stopping = 1;
3120
3121 drop_leases(mdsc);
3122 ceph_flush_dirty_caps(mdsc);
3123 wait_requests(mdsc);
3124
3125 /*
3126 * wait for reply handlers to drop their request refs and
3127 * their inode/dcache refs
3128 */
3129 ceph_msgr_flush();
3130 }
3131
3132 /*
3133 * wait for all write mds requests to flush.
3134 */
3135 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3136 {
3137 struct ceph_mds_request *req = NULL, *nextreq;
3138 struct rb_node *n;
3139
3140 mutex_lock(&mdsc->mutex);
3141 dout("wait_unsafe_requests want %lld\n", want_tid);
3142 restart:
3143 req = __get_oldest_req(mdsc);
3144 while (req && req->r_tid <= want_tid) {
3145 /* find next request */
3146 n = rb_next(&req->r_node);
3147 if (n)
3148 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3149 else
3150 nextreq = NULL;
3151 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
3152 /* write op */
3153 ceph_mdsc_get_request(req);
3154 if (nextreq)
3155 ceph_mdsc_get_request(nextreq);
3156 mutex_unlock(&mdsc->mutex);
3157 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3158 req->r_tid, want_tid);
3159 wait_for_completion(&req->r_safe_completion);
3160 mutex_lock(&mdsc->mutex);
3161 ceph_mdsc_put_request(req);
3162 if (!nextreq)
3163 break; /* next dne before, so we're done! */
3164 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3165 /* next request was removed from tree */
3166 ceph_mdsc_put_request(nextreq);
3167 goto restart;
3168 }
3169 ceph_mdsc_put_request(nextreq); /* won't go away */
3170 }
3171 req = nextreq;
3172 }
3173 mutex_unlock(&mdsc->mutex);
3174 dout("wait_unsafe_requests done\n");
3175 }
3176
3177 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3178 {
3179 u64 want_tid, want_flush;
3180
3181 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3182 return;
3183
3184 dout("sync\n");
3185 mutex_lock(&mdsc->mutex);
3186 want_tid = mdsc->last_tid;
3187 want_flush = mdsc->cap_flush_seq;
3188 mutex_unlock(&mdsc->mutex);
3189 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
3190
3191 ceph_flush_dirty_caps(mdsc);
3192
3193 wait_unsafe_requests(mdsc, want_tid);
3194 wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
3195 }
3196
3197 /*
3198 * true if all sessions are closed, or we force unmount
3199 */
3200 static bool done_closing_sessions(struct ceph_mds_client *mdsc)
3201 {
3202 int i, n = 0;
3203
3204 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3205 return true;
3206
3207 mutex_lock(&mdsc->mutex);
3208 for (i = 0; i < mdsc->max_sessions; i++)
3209 if (mdsc->sessions[i])
3210 n++;
3211 mutex_unlock(&mdsc->mutex);
3212 return n == 0;
3213 }
3214
3215 /*
3216 * called after sb is ro.
3217 */
3218 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3219 {
3220 struct ceph_mds_session *session;
3221 int i;
3222 struct ceph_fs_client *fsc = mdsc->fsc;
3223 unsigned long timeout = fsc->client->options->mount_timeout * HZ;
3224
3225 dout("close_sessions\n");
3226
3227 /* close sessions */
3228 mutex_lock(&mdsc->mutex);
3229 for (i = 0; i < mdsc->max_sessions; i++) {
3230 session = __ceph_lookup_mds_session(mdsc, i);
3231 if (!session)
3232 continue;
3233 mutex_unlock(&mdsc->mutex);
3234 mutex_lock(&session->s_mutex);
3235 __close_session(mdsc, session);
3236 mutex_unlock(&session->s_mutex);
3237 ceph_put_mds_session(session);
3238 mutex_lock(&mdsc->mutex);
3239 }
3240 mutex_unlock(&mdsc->mutex);
3241
3242 dout("waiting for sessions to close\n");
3243 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3244 timeout);
3245
3246 /* tear down remaining sessions */
3247 mutex_lock(&mdsc->mutex);
3248 for (i = 0; i < mdsc->max_sessions; i++) {
3249 if (mdsc->sessions[i]) {
3250 session = get_session(mdsc->sessions[i]);
3251 __unregister_session(mdsc, session);
3252 mutex_unlock(&mdsc->mutex);
3253 mutex_lock(&session->s_mutex);
3254 remove_session_caps(session);
3255 mutex_unlock(&session->s_mutex);
3256 ceph_put_mds_session(session);
3257 mutex_lock(&mdsc->mutex);
3258 }
3259 }
3260 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3261 mutex_unlock(&mdsc->mutex);
3262
3263 ceph_cleanup_empty_realms(mdsc);
3264
3265 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3266
3267 dout("stopped\n");
3268 }
3269
3270 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3271 {
3272 dout("stop\n");
3273 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3274 if (mdsc->mdsmap)
3275 ceph_mdsmap_destroy(mdsc->mdsmap);
3276 kfree(mdsc->sessions);
3277 ceph_caps_finalize(mdsc);
3278 }
3279
3280 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3281 {
3282 struct ceph_mds_client *mdsc = fsc->mdsc;
3283
3284 dout("mdsc_destroy %p\n", mdsc);
3285 ceph_mdsc_stop(mdsc);
3286
3287 /* flush out any connection work with references to us */
3288 ceph_msgr_flush();
3289
3290 fsc->mdsc = NULL;
3291 kfree(mdsc);
3292 dout("mdsc_destroy %p done\n", mdsc);
3293 }
3294
3295
3296 /*
3297 * handle mds map update.
3298 */
3299 void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3300 {
3301 u32 epoch;
3302 u32 maplen;
3303 void *p = msg->front.iov_base;
3304 void *end = p + msg->front.iov_len;
3305 struct ceph_mdsmap *newmap, *oldmap;
3306 struct ceph_fsid fsid;
3307 int err = -EINVAL;
3308
3309 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3310 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3311 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3312 return;
3313 epoch = ceph_decode_32(&p);
3314 maplen = ceph_decode_32(&p);
3315 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3316
3317 /* do we need it? */
3318 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
3319 mutex_lock(&mdsc->mutex);
3320 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3321 dout("handle_map epoch %u <= our %u\n",
3322 epoch, mdsc->mdsmap->m_epoch);
3323 mutex_unlock(&mdsc->mutex);
3324 return;
3325 }
3326
3327 newmap = ceph_mdsmap_decode(&p, end);
3328 if (IS_ERR(newmap)) {
3329 err = PTR_ERR(newmap);
3330 goto bad_unlock;
3331 }
3332
3333 /* swap into place */
3334 if (mdsc->mdsmap) {
3335 oldmap = mdsc->mdsmap;
3336 mdsc->mdsmap = newmap;
3337 check_new_map(mdsc, newmap, oldmap);
3338 ceph_mdsmap_destroy(oldmap);
3339 } else {
3340 mdsc->mdsmap = newmap; /* first mds map */
3341 }
3342 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3343
3344 __wake_requests(mdsc, &mdsc->waiting_for_map);
3345
3346 mutex_unlock(&mdsc->mutex);
3347 schedule_delayed(mdsc);
3348 return;
3349
3350 bad_unlock:
3351 mutex_unlock(&mdsc->mutex);
3352 bad:
3353 pr_err("error decoding mdsmap %d\n", err);
3354 return;
3355 }
3356
3357 static struct ceph_connection *con_get(struct ceph_connection *con)
3358 {
3359 struct ceph_mds_session *s = con->private;
3360
3361 if (get_session(s)) {
3362 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3363 return con;
3364 }
3365 dout("mdsc con_get %p FAIL\n", s);
3366 return NULL;
3367 }
3368
3369 static void con_put(struct ceph_connection *con)
3370 {
3371 struct ceph_mds_session *s = con->private;
3372
3373 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
3374 ceph_put_mds_session(s);
3375 }
3376
3377 /*
3378 * if the client is unresponsive for long enough, the mds will kill
3379 * the session entirely.
3380 */
3381 static void peer_reset(struct ceph_connection *con)
3382 {
3383 struct ceph_mds_session *s = con->private;
3384 struct ceph_mds_client *mdsc = s->s_mdsc;
3385
3386 pr_warning("mds%d closed our session\n", s->s_mds);
3387 send_mds_reconnect(mdsc, s);
3388 }
3389
3390 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3391 {
3392 struct ceph_mds_session *s = con->private;
3393 struct ceph_mds_client *mdsc = s->s_mdsc;
3394 int type = le16_to_cpu(msg->hdr.type);
3395
3396 mutex_lock(&mdsc->mutex);
3397 if (__verify_registered_session(mdsc, s) < 0) {
3398 mutex_unlock(&mdsc->mutex);
3399 goto out;
3400 }
3401 mutex_unlock(&mdsc->mutex);
3402
3403 switch (type) {
3404 case CEPH_MSG_MDS_MAP:
3405 ceph_mdsc_handle_map(mdsc, msg);
3406 break;
3407 case CEPH_MSG_CLIENT_SESSION:
3408 handle_session(s, msg);
3409 break;
3410 case CEPH_MSG_CLIENT_REPLY:
3411 handle_reply(s, msg);
3412 break;
3413 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3414 handle_forward(mdsc, s, msg);
3415 break;
3416 case CEPH_MSG_CLIENT_CAPS:
3417 ceph_handle_caps(s, msg);
3418 break;
3419 case CEPH_MSG_CLIENT_SNAP:
3420 ceph_handle_snap(mdsc, s, msg);
3421 break;
3422 case CEPH_MSG_CLIENT_LEASE:
3423 handle_lease(mdsc, s, msg);
3424 break;
3425
3426 default:
3427 pr_err("received unknown message type %d %s\n", type,
3428 ceph_msg_type_name(type));
3429 }
3430 out:
3431 ceph_msg_put(msg);
3432 }
3433
3434 /*
3435 * authentication
3436 */
3437
3438 /*
3439 * Note: returned pointer is the address of a structure that's
3440 * managed separately. Caller must *not* attempt to free it.
3441 */
3442 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
3443 int *proto, int force_new)
3444 {
3445 struct ceph_mds_session *s = con->private;
3446 struct ceph_mds_client *mdsc = s->s_mdsc;
3447 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3448 struct ceph_auth_handshake *auth = &s->s_auth;
3449
3450 if (force_new && auth->authorizer) {
3451 ceph_auth_destroy_authorizer(ac, auth->authorizer);
3452 auth->authorizer = NULL;
3453 }
3454 if (!auth->authorizer) {
3455 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3456 auth);
3457 if (ret)
3458 return ERR_PTR(ret);
3459 } else {
3460 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3461 auth);
3462 if (ret)
3463 return ERR_PTR(ret);
3464 }
3465 *proto = ac->protocol;
3466
3467 return auth;
3468 }
3469
3470
3471 static int verify_authorizer_reply(struct ceph_connection *con, int len)
3472 {
3473 struct ceph_mds_session *s = con->private;
3474 struct ceph_mds_client *mdsc = s->s_mdsc;
3475 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3476
3477 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
3478 }
3479
3480 static int invalidate_authorizer(struct ceph_connection *con)
3481 {
3482 struct ceph_mds_session *s = con->private;
3483 struct ceph_mds_client *mdsc = s->s_mdsc;
3484 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3485
3486 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3487
3488 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
3489 }
3490
3491 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3492 struct ceph_msg_header *hdr, int *skip)
3493 {
3494 struct ceph_msg *msg;
3495 int type = (int) le16_to_cpu(hdr->type);
3496 int front_len = (int) le32_to_cpu(hdr->front_len);
3497
3498 if (con->in_msg)
3499 return con->in_msg;
3500
3501 *skip = 0;
3502 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3503 if (!msg) {
3504 pr_err("unable to allocate msg type %d len %d\n",
3505 type, front_len);
3506 return NULL;
3507 }
3508
3509 return msg;
3510 }
3511
3512 static const struct ceph_connection_operations mds_con_ops = {
3513 .get = con_get,
3514 .put = con_put,
3515 .dispatch = dispatch,
3516 .get_authorizer = get_authorizer,
3517 .verify_authorizer_reply = verify_authorizer_reply,
3518 .invalidate_authorizer = invalidate_authorizer,
3519 .peer_reset = peer_reset,
3520 .alloc_msg = mds_alloc_msg,
3521 };
3522
3523 /* eof */
Linux with added FPC-III support