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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / fs / ceph / mds_client.c
blob866e8d7ca37d7343fe7c30cc5e036cb5d6b9494e
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/messenger.h>
14 #include <linux/ceph/decode.h>
15 #include <linux/ceph/pagelist.h>
16 #include <linux/ceph/auth.h>
17 #include <linux/ceph/debugfs.h>
18
19 /*
20 * A cluster of MDS (metadata server) daemons is responsible for
21 * managing the file system namespace (the directory hierarchy and
22 * inodes) and for coordinating shared access to storage. Metadata is
23 * partitioning hierarchically across a number of servers, and that
24 * partition varies over time as the cluster adjusts the distribution
25 * in order to balance load.
26 *
27 * The MDS client is primarily responsible to managing synchronous
28 * metadata requests for operations like open, unlink, and so forth.
29 * If there is a MDS failure, we find out about it when we (possibly
30 * request and) receive a new MDS map, and can resubmit affected
31 * requests.
32 *
33 * For the most part, though, we take advantage of a lossless
34 * communications channel to the MDS, and do not need to worry about
35 * timing out or resubmitting requests.
36 *
37 * We maintain a stateful "session" with each MDS we interact with.
38 * Within each session, we sent periodic heartbeat messages to ensure
39 * any capabilities or leases we have been issues remain valid. If
40 * the session times out and goes stale, our leases and capabilities
41 * are no longer valid.
42 */
43
44 struct ceph_reconnect_state {
45 struct ceph_pagelist *pagelist;
46 bool flock;
47 };
48
49 static void __wake_requests(struct ceph_mds_client *mdsc,
50 struct list_head *head);
51
52 static const struct ceph_connection_operations mds_con_ops;
53
54
55 /*
56 * mds reply parsing
57 */
58
59 /*
60 * parse individual inode info
61 */
62 static int parse_reply_info_in(void **p, void *end,
63 struct ceph_mds_reply_info_in *info,
64 int features)
65 {
66 int err = -EIO;
67
68 info->in = *p;
69 *p += sizeof(struct ceph_mds_reply_inode) +
70 sizeof(*info->in->fragtree.splits) *
71 le32_to_cpu(info->in->fragtree.nsplits);
72
73 ceph_decode_32_safe(p, end, info->symlink_len, bad);
74 ceph_decode_need(p, end, info->symlink_len, bad);
75 info->symlink = *p;
76 *p += info->symlink_len;
77
78 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
79 ceph_decode_copy_safe(p, end, &info->dir_layout,
80 sizeof(info->dir_layout), bad);
81 else
82 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
83
84 ceph_decode_32_safe(p, end, info->xattr_len, bad);
85 ceph_decode_need(p, end, info->xattr_len, bad);
86 info->xattr_data = *p;
87 *p += info->xattr_len;
88 return 0;
89 bad:
90 return err;
91 }
92
93 /*
94 * parse a normal reply, which may contain a (dir+)dentry and/or a
95 * target inode.
96 */
97 static int parse_reply_info_trace(void **p, void *end,
98 struct ceph_mds_reply_info_parsed *info,
99 int features)
100 {
101 int err;
102
103 if (info->head->is_dentry) {
104 err = parse_reply_info_in(p, end, &info->diri, features);
105 if (err < 0)
106 goto out_bad;
107
108 if (unlikely(*p + sizeof(*info->dirfrag) > end))
109 goto bad;
110 info->dirfrag = *p;
111 *p += sizeof(*info->dirfrag) +
112 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
113 if (unlikely(*p > end))
114 goto bad;
115
116 ceph_decode_32_safe(p, end, info->dname_len, bad);
117 ceph_decode_need(p, end, info->dname_len, bad);
118 info->dname = *p;
119 *p += info->dname_len;
120 info->dlease = *p;
121 *p += sizeof(*info->dlease);
122 }
123
124 if (info->head->is_target) {
125 err = parse_reply_info_in(p, end, &info->targeti, features);
126 if (err < 0)
127 goto out_bad;
128 }
129
130 if (unlikely(*p != end))
131 goto bad;
132 return 0;
133
134 bad:
135 err = -EIO;
136 out_bad:
137 pr_err("problem parsing mds trace %d\n", err);
138 return err;
139 }
140
141 /*
142 * parse readdir results
143 */
144 static int parse_reply_info_dir(void **p, void *end,
145 struct ceph_mds_reply_info_parsed *info,
146 int features)
147 {
148 u32 num, i = 0;
149 int err;
150
151 info->dir_dir = *p;
152 if (*p + sizeof(*info->dir_dir) > end)
153 goto bad;
154 *p += sizeof(*info->dir_dir) +
155 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
156 if (*p > end)
157 goto bad;
158
159 ceph_decode_need(p, end, sizeof(num) + 2, bad);
160 num = ceph_decode_32(p);
161 info->dir_end = ceph_decode_8(p);
162 info->dir_complete = ceph_decode_8(p);
163 if (num == 0)
164 goto done;
165
166 /* alloc large array */
167 info->dir_nr = num;
168 info->dir_in = kcalloc(num, sizeof(*info->dir_in) +
169 sizeof(*info->dir_dname) +
170 sizeof(*info->dir_dname_len) +
171 sizeof(*info->dir_dlease),
172 GFP_NOFS);
173 if (info->dir_in == NULL) {
174 err = -ENOMEM;
175 goto out_bad;
176 }
177 info->dir_dname = (void *)(info->dir_in + num);
178 info->dir_dname_len = (void *)(info->dir_dname + num);
179 info->dir_dlease = (void *)(info->dir_dname_len + num);
180
181 while (num) {
182 /* dentry */
183 ceph_decode_need(p, end, sizeof(u32)*2, bad);
184 info->dir_dname_len[i] = ceph_decode_32(p);
185 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
186 info->dir_dname[i] = *p;
187 *p += info->dir_dname_len[i];
188 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
189 info->dir_dname[i]);
190 info->dir_dlease[i] = *p;
191 *p += sizeof(struct ceph_mds_reply_lease);
192
193 /* inode */
194 err = parse_reply_info_in(p, end, &info->dir_in[i], features);
195 if (err < 0)
196 goto out_bad;
197 i++;
198 num--;
199 }
200
201 done:
202 if (*p != end)
203 goto bad;
204 return 0;
205
206 bad:
207 err = -EIO;
208 out_bad:
209 pr_err("problem parsing dir contents %d\n", err);
210 return err;
211 }
212
213 /*
214 * parse fcntl F_GETLK results
215 */
216 static int parse_reply_info_filelock(void **p, void *end,
217 struct ceph_mds_reply_info_parsed *info,
218 int features)
219 {
220 if (*p + sizeof(*info->filelock_reply) > end)
221 goto bad;
222
223 info->filelock_reply = *p;
224 *p += sizeof(*info->filelock_reply);
225
226 if (unlikely(*p != end))
227 goto bad;
228 return 0;
229
230 bad:
231 return -EIO;
232 }
233
234 /*
235 * parse extra results
236 */
237 static int parse_reply_info_extra(void **p, void *end,
238 struct ceph_mds_reply_info_parsed *info,
239 int features)
240 {
241 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
242 return parse_reply_info_filelock(p, end, info, features);
243 else
244 return parse_reply_info_dir(p, end, info, features);
245 }
246
247 /*
248 * parse entire mds reply
249 */
250 static int parse_reply_info(struct ceph_msg *msg,
251 struct ceph_mds_reply_info_parsed *info,
252 int features)
253 {
254 void *p, *end;
255 u32 len;
256 int err;
257
258 info->head = msg->front.iov_base;
259 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
260 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
261
262 /* trace */
263 ceph_decode_32_safe(&p, end, len, bad);
264 if (len > 0) {
265 ceph_decode_need(&p, end, len, bad);
266 err = parse_reply_info_trace(&p, p+len, info, features);
267 if (err < 0)
268 goto out_bad;
269 }
270
271 /* extra */
272 ceph_decode_32_safe(&p, end, len, bad);
273 if (len > 0) {
274 ceph_decode_need(&p, end, len, bad);
275 err = parse_reply_info_extra(&p, p+len, info, features);
276 if (err < 0)
277 goto out_bad;
278 }
279
280 /* snap blob */
281 ceph_decode_32_safe(&p, end, len, bad);
282 info->snapblob_len = len;
283 info->snapblob = p;
284 p += len;
285
286 if (p != end)
287 goto bad;
288 return 0;
289
290 bad:
291 err = -EIO;
292 out_bad:
293 pr_err("mds parse_reply err %d\n", err);
294 return err;
295 }
296
297 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
298 {
299 kfree(info->dir_in);
300 }
301
302
303 /*
304 * sessions
305 */
306 static const char *session_state_name(int s)
307 {
308 switch (s) {
309 case CEPH_MDS_SESSION_NEW: return "new";
310 case CEPH_MDS_SESSION_OPENING: return "opening";
311 case CEPH_MDS_SESSION_OPEN: return "open";
312 case CEPH_MDS_SESSION_HUNG: return "hung";
313 case CEPH_MDS_SESSION_CLOSING: return "closing";
314 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
315 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
316 default: return "???";
317 }
318 }
319
320 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
321 {
322 if (atomic_inc_not_zero(&s->s_ref)) {
323 dout("mdsc get_session %p %d -> %d\n", s,
324 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
325 return s;
326 } else {
327 dout("mdsc get_session %p 0 -- FAIL", s);
328 return NULL;
329 }
330 }
331
332 void ceph_put_mds_session(struct ceph_mds_session *s)
333 {
334 dout("mdsc put_session %p %d -> %d\n", s,
335 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
336 if (atomic_dec_and_test(&s->s_ref)) {
337 if (s->s_authorizer)
338 s->s_mdsc->fsc->client->monc.auth->ops->destroy_authorizer(
339 s->s_mdsc->fsc->client->monc.auth,
340 s->s_authorizer);
341 kfree(s);
342 }
343 }
344
345 /*
346 * called under mdsc->mutex
347 */
348 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
349 int mds)
350 {
351 struct ceph_mds_session *session;
352
353 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
354 return NULL;
355 session = mdsc->sessions[mds];
356 dout("lookup_mds_session %p %d\n", session,
357 atomic_read(&session->s_ref));
358 get_session(session);
359 return session;
360 }
361
362 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
363 {
364 if (mds >= mdsc->max_sessions)
365 return false;
366 return mdsc->sessions[mds];
367 }
368
369 static int __verify_registered_session(struct ceph_mds_client *mdsc,
370 struct ceph_mds_session *s)
371 {
372 if (s->s_mds >= mdsc->max_sessions ||
373 mdsc->sessions[s->s_mds] != s)
374 return -ENOENT;
375 return 0;
376 }
377
378 /*
379 * create+register a new session for given mds.
380 * called under mdsc->mutex.
381 */
382 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
383 int mds)
384 {
385 struct ceph_mds_session *s;
386
387 s = kzalloc(sizeof(*s), GFP_NOFS);
388 if (!s)
389 return ERR_PTR(-ENOMEM);
390 s->s_mdsc = mdsc;
391 s->s_mds = mds;
392 s->s_state = CEPH_MDS_SESSION_NEW;
393 s->s_ttl = 0;
394 s->s_seq = 0;
395 mutex_init(&s->s_mutex);
396
397 ceph_con_init(mdsc->fsc->client->msgr, &s->s_con);
398 s->s_con.private = s;
399 s->s_con.ops = &mds_con_ops;
400 s->s_con.peer_name.type = CEPH_ENTITY_TYPE_MDS;
401 s->s_con.peer_name.num = cpu_to_le64(mds);
402
403 spin_lock_init(&s->s_gen_ttl_lock);
404 s->s_cap_gen = 0;
405 s->s_cap_ttl = 0;
406
407 spin_lock_init(&s->s_cap_lock);
408 s->s_renew_requested = 0;
409 s->s_renew_seq = 0;
410 INIT_LIST_HEAD(&s->s_caps);
411 s->s_nr_caps = 0;
412 s->s_trim_caps = 0;
413 atomic_set(&s->s_ref, 1);
414 INIT_LIST_HEAD(&s->s_waiting);
415 INIT_LIST_HEAD(&s->s_unsafe);
416 s->s_num_cap_releases = 0;
417 s->s_cap_iterator = NULL;
418 INIT_LIST_HEAD(&s->s_cap_releases);
419 INIT_LIST_HEAD(&s->s_cap_releases_done);
420 INIT_LIST_HEAD(&s->s_cap_flushing);
421 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
422
423 dout("register_session mds%d\n", mds);
424 if (mds >= mdsc->max_sessions) {
425 int newmax = 1 << get_count_order(mds+1);
426 struct ceph_mds_session **sa;
427
428 dout("register_session realloc to %d\n", newmax);
429 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
430 if (sa == NULL)
431 goto fail_realloc;
432 if (mdsc->sessions) {
433 memcpy(sa, mdsc->sessions,
434 mdsc->max_sessions * sizeof(void *));
435 kfree(mdsc->sessions);
436 }
437 mdsc->sessions = sa;
438 mdsc->max_sessions = newmax;
439 }
440 mdsc->sessions[mds] = s;
441 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
442
443 ceph_con_open(&s->s_con, ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
444
445 return s;
446
447 fail_realloc:
448 kfree(s);
449 return ERR_PTR(-ENOMEM);
450 }
451
452 /*
453 * called under mdsc->mutex
454 */
455 static void __unregister_session(struct ceph_mds_client *mdsc,
456 struct ceph_mds_session *s)
457 {
458 dout("__unregister_session mds%d %p\n", s->s_mds, s);
459 BUG_ON(mdsc->sessions[s->s_mds] != s);
460 mdsc->sessions[s->s_mds] = NULL;
461 ceph_con_close(&s->s_con);
462 ceph_put_mds_session(s);
463 }
464
465 /*
466 * drop session refs in request.
467 *
468 * should be last request ref, or hold mdsc->mutex
469 */
470 static void put_request_session(struct ceph_mds_request *req)
471 {
472 if (req->r_session) {
473 ceph_put_mds_session(req->r_session);
474 req->r_session = NULL;
475 }
476 }
477
478 void ceph_mdsc_release_request(struct kref *kref)
479 {
480 struct ceph_mds_request *req = container_of(kref,
481 struct ceph_mds_request,
482 r_kref);
483 if (req->r_request)
484 ceph_msg_put(req->r_request);
485 if (req->r_reply) {
486 ceph_msg_put(req->r_reply);
487 destroy_reply_info(&req->r_reply_info);
488 }
489 if (req->r_inode) {
490 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
491 iput(req->r_inode);
492 }
493 if (req->r_locked_dir)
494 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
495 if (req->r_target_inode)
496 iput(req->r_target_inode);
497 if (req->r_dentry)
498 dput(req->r_dentry);
499 if (req->r_old_dentry) {
500 /*
501 * track (and drop pins for) r_old_dentry_dir
502 * separately, since r_old_dentry's d_parent may have
503 * changed between the dir mutex being dropped and
504 * this request being freed.
505 */
506 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
507 CEPH_CAP_PIN);
508 dput(req->r_old_dentry);
509 iput(req->r_old_dentry_dir);
510 }
511 kfree(req->r_path1);
512 kfree(req->r_path2);
513 put_request_session(req);
514 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
515 kfree(req);
516 }
517
518 /*
519 * lookup session, bump ref if found.
520 *
521 * called under mdsc->mutex.
522 */
523 static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
524 u64 tid)
525 {
526 struct ceph_mds_request *req;
527 struct rb_node *n = mdsc->request_tree.rb_node;
528
529 while (n) {
530 req = rb_entry(n, struct ceph_mds_request, r_node);
531 if (tid < req->r_tid)
532 n = n->rb_left;
533 else if (tid > req->r_tid)
534 n = n->rb_right;
535 else {
536 ceph_mdsc_get_request(req);
537 return req;
538 }
539 }
540 return NULL;
541 }
542
543 static void __insert_request(struct ceph_mds_client *mdsc,
544 struct ceph_mds_request *new)
545 {
546 struct rb_node **p = &mdsc->request_tree.rb_node;
547 struct rb_node *parent = NULL;
548 struct ceph_mds_request *req = NULL;
549
550 while (*p) {
551 parent = *p;
552 req = rb_entry(parent, struct ceph_mds_request, r_node);
553 if (new->r_tid < req->r_tid)
554 p = &(*p)->rb_left;
555 else if (new->r_tid > req->r_tid)
556 p = &(*p)->rb_right;
557 else
558 BUG();
559 }
560
561 rb_link_node(&new->r_node, parent, p);
562 rb_insert_color(&new->r_node, &mdsc->request_tree);
563 }
564
565 /*
566 * Register an in-flight request, and assign a tid. Link to directory
567 * are modifying (if any).
568 *
569 * Called under mdsc->mutex.
570 */
571 static void __register_request(struct ceph_mds_client *mdsc,
572 struct ceph_mds_request *req,
573 struct inode *dir)
574 {
575 req->r_tid = ++mdsc->last_tid;
576 if (req->r_num_caps)
577 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
578 req->r_num_caps);
579 dout("__register_request %p tid %lld\n", req, req->r_tid);
580 ceph_mdsc_get_request(req);
581 __insert_request(mdsc, req);
582
583 req->r_uid = current_fsuid();
584 req->r_gid = current_fsgid();
585
586 if (dir) {
587 struct ceph_inode_info *ci = ceph_inode(dir);
588
589 ihold(dir);
590 spin_lock(&ci->i_unsafe_lock);
591 req->r_unsafe_dir = dir;
592 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
593 spin_unlock(&ci->i_unsafe_lock);
594 }
595 }
596
597 static void __unregister_request(struct ceph_mds_client *mdsc,
598 struct ceph_mds_request *req)
599 {
600 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
601 rb_erase(&req->r_node, &mdsc->request_tree);
602 RB_CLEAR_NODE(&req->r_node);
603
604 if (req->r_unsafe_dir) {
605 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
606
607 spin_lock(&ci->i_unsafe_lock);
608 list_del_init(&req->r_unsafe_dir_item);
609 spin_unlock(&ci->i_unsafe_lock);
610
611 iput(req->r_unsafe_dir);
612 req->r_unsafe_dir = NULL;
613 }
614
615 ceph_mdsc_put_request(req);
616 }
617
618 /*
619 * Choose mds to send request to next. If there is a hint set in the
620 * request (e.g., due to a prior forward hint from the mds), use that.
621 * Otherwise, consult frag tree and/or caps to identify the
622 * appropriate mds. If all else fails, choose randomly.
623 *
624 * Called under mdsc->mutex.
625 */
626 static struct dentry *get_nonsnap_parent(struct dentry *dentry)
627 {
628 /*
629 * we don't need to worry about protecting the d_parent access
630 * here because we never renaming inside the snapped namespace
631 * except to resplice to another snapdir, and either the old or new
632 * result is a valid result.
633 */
634 while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
635 dentry = dentry->d_parent;
636 return dentry;
637 }
638
639 static int __choose_mds(struct ceph_mds_client *mdsc,
640 struct ceph_mds_request *req)
641 {
642 struct inode *inode;
643 struct ceph_inode_info *ci;
644 struct ceph_cap *cap;
645 int mode = req->r_direct_mode;
646 int mds = -1;
647 u32 hash = req->r_direct_hash;
648 bool is_hash = req->r_direct_is_hash;
649
650 /*
651 * is there a specific mds we should try? ignore hint if we have
652 * no session and the mds is not up (active or recovering).
653 */
654 if (req->r_resend_mds >= 0 &&
655 (__have_session(mdsc, req->r_resend_mds) ||
656 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
657 dout("choose_mds using resend_mds mds%d\n",
658 req->r_resend_mds);
659 return req->r_resend_mds;
660 }
661
662 if (mode == USE_RANDOM_MDS)
663 goto random;
664
665 inode = NULL;
666 if (req->r_inode) {
667 inode = req->r_inode;
668 } else if (req->r_dentry) {
669 /* ignore race with rename; old or new d_parent is okay */
670 struct dentry *parent = req->r_dentry->d_parent;
671 struct inode *dir = parent->d_inode;
672
673 if (dir->i_sb != mdsc->fsc->sb) {
674 /* not this fs! */
675 inode = req->r_dentry->d_inode;
676 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
677 /* direct snapped/virtual snapdir requests
678 * based on parent dir inode */
679 struct dentry *dn = get_nonsnap_parent(parent);
680 inode = dn->d_inode;
681 dout("__choose_mds using nonsnap parent %p\n", inode);
682 } else if (req->r_dentry->d_inode) {
683 /* dentry target */
684 inode = req->r_dentry->d_inode;
685 } else {
686 /* dir + name */
687 inode = dir;
688 hash = ceph_dentry_hash(dir, req->r_dentry);
689 is_hash = true;
690 }
691 }
692
693 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
694 (int)hash, mode);
695 if (!inode)
696 goto random;
697 ci = ceph_inode(inode);
698
699 if (is_hash && S_ISDIR(inode->i_mode)) {
700 struct ceph_inode_frag frag;
701 int found;
702
703 ceph_choose_frag(ci, hash, &frag, &found);
704 if (found) {
705 if (mode == USE_ANY_MDS && frag.ndist > 0) {
706 u8 r;
707
708 /* choose a random replica */
709 get_random_bytes(&r, 1);
710 r %= frag.ndist;
711 mds = frag.dist[r];
712 dout("choose_mds %p %llx.%llx "
713 "frag %u mds%d (%d/%d)\n",
714 inode, ceph_vinop(inode),
715 frag.frag, mds,
716 (int)r, frag.ndist);
717 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
718 CEPH_MDS_STATE_ACTIVE)
719 return mds;
720 }
721
722 /* since this file/dir wasn't known to be
723 * replicated, then we want to look for the
724 * authoritative mds. */
725 mode = USE_AUTH_MDS;
726 if (frag.mds >= 0) {
727 /* choose auth mds */
728 mds = frag.mds;
729 dout("choose_mds %p %llx.%llx "
730 "frag %u mds%d (auth)\n",
731 inode, ceph_vinop(inode), frag.frag, mds);
732 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
733 CEPH_MDS_STATE_ACTIVE)
734 return mds;
735 }
736 }
737 }
738
739 spin_lock(&ci->i_ceph_lock);
740 cap = NULL;
741 if (mode == USE_AUTH_MDS)
742 cap = ci->i_auth_cap;
743 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
744 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
745 if (!cap) {
746 spin_unlock(&ci->i_ceph_lock);
747 goto random;
748 }
749 mds = cap->session->s_mds;
750 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
751 inode, ceph_vinop(inode), mds,
752 cap == ci->i_auth_cap ? "auth " : "", cap);
753 spin_unlock(&ci->i_ceph_lock);
754 return mds;
755
756 random:
757 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
758 dout("choose_mds chose random mds%d\n", mds);
759 return mds;
760 }
761
762
763 /*
764 * session messages
765 */
766 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
767 {
768 struct ceph_msg *msg;
769 struct ceph_mds_session_head *h;
770
771 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
772 false);
773 if (!msg) {
774 pr_err("create_session_msg ENOMEM creating msg\n");
775 return NULL;
776 }
777 h = msg->front.iov_base;
778 h->op = cpu_to_le32(op);
779 h->seq = cpu_to_le64(seq);
780 return msg;
781 }
782
783 /*
784 * send session open request.
785 *
786 * called under mdsc->mutex
787 */
788 static int __open_session(struct ceph_mds_client *mdsc,
789 struct ceph_mds_session *session)
790 {
791 struct ceph_msg *msg;
792 int mstate;
793 int mds = session->s_mds;
794
795 /* wait for mds to go active? */
796 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
797 dout("open_session to mds%d (%s)\n", mds,
798 ceph_mds_state_name(mstate));
799 session->s_state = CEPH_MDS_SESSION_OPENING;
800 session->s_renew_requested = jiffies;
801
802 /* send connect message */
803 msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq);
804 if (!msg)
805 return -ENOMEM;
806 ceph_con_send(&session->s_con, msg);
807 return 0;
808 }
809
810 /*
811 * open sessions for any export targets for the given mds
812 *
813 * called under mdsc->mutex
814 */
815 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
816 struct ceph_mds_session *session)
817 {
818 struct ceph_mds_info *mi;
819 struct ceph_mds_session *ts;
820 int i, mds = session->s_mds;
821 int target;
822
823 if (mds >= mdsc->mdsmap->m_max_mds)
824 return;
825 mi = &mdsc->mdsmap->m_info[mds];
826 dout("open_export_target_sessions for mds%d (%d targets)\n",
827 session->s_mds, mi->num_export_targets);
828
829 for (i = 0; i < mi->num_export_targets; i++) {
830 target = mi->export_targets[i];
831 ts = __ceph_lookup_mds_session(mdsc, target);
832 if (!ts) {
833 ts = register_session(mdsc, target);
834 if (IS_ERR(ts))
835 return;
836 }
837 if (session->s_state == CEPH_MDS_SESSION_NEW ||
838 session->s_state == CEPH_MDS_SESSION_CLOSING)
839 __open_session(mdsc, session);
840 else
841 dout(" mds%d target mds%d %p is %s\n", session->s_mds,
842 i, ts, session_state_name(ts->s_state));
843 ceph_put_mds_session(ts);
844 }
845 }
846
847 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
848 struct ceph_mds_session *session)
849 {
850 mutex_lock(&mdsc->mutex);
851 __open_export_target_sessions(mdsc, session);
852 mutex_unlock(&mdsc->mutex);
853 }
854
855 /*
856 * session caps
857 */
858
859 /*
860 * Free preallocated cap messages assigned to this session
861 */
862 static void cleanup_cap_releases(struct ceph_mds_session *session)
863 {
864 struct ceph_msg *msg;
865
866 spin_lock(&session->s_cap_lock);
867 while (!list_empty(&session->s_cap_releases)) {
868 msg = list_first_entry(&session->s_cap_releases,
869 struct ceph_msg, list_head);
870 list_del_init(&msg->list_head);
871 ceph_msg_put(msg);
872 }
873 while (!list_empty(&session->s_cap_releases_done)) {
874 msg = list_first_entry(&session->s_cap_releases_done,
875 struct ceph_msg, list_head);
876 list_del_init(&msg->list_head);
877 ceph_msg_put(msg);
878 }
879 spin_unlock(&session->s_cap_lock);
880 }
881
882 /*
883 * Helper to safely iterate over all caps associated with a session, with
884 * special care taken to handle a racing __ceph_remove_cap().
885 *
886 * Caller must hold session s_mutex.
887 */
888 static int iterate_session_caps(struct ceph_mds_session *session,
889 int (*cb)(struct inode *, struct ceph_cap *,
890 void *), void *arg)
891 {
892 struct list_head *p;
893 struct ceph_cap *cap;
894 struct inode *inode, *last_inode = NULL;
895 struct ceph_cap *old_cap = NULL;
896 int ret;
897
898 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
899 spin_lock(&session->s_cap_lock);
900 p = session->s_caps.next;
901 while (p != &session->s_caps) {
902 cap = list_entry(p, struct ceph_cap, session_caps);
903 inode = igrab(&cap->ci->vfs_inode);
904 if (!inode) {
905 p = p->next;
906 continue;
907 }
908 session->s_cap_iterator = cap;
909 spin_unlock(&session->s_cap_lock);
910
911 if (last_inode) {
912 iput(last_inode);
913 last_inode = NULL;
914 }
915 if (old_cap) {
916 ceph_put_cap(session->s_mdsc, old_cap);
917 old_cap = NULL;
918 }
919
920 ret = cb(inode, cap, arg);
921 last_inode = inode;
922
923 spin_lock(&session->s_cap_lock);
924 p = p->next;
925 if (cap->ci == NULL) {
926 dout("iterate_session_caps finishing cap %p removal\n",
927 cap);
928 BUG_ON(cap->session != session);
929 list_del_init(&cap->session_caps);
930 session->s_nr_caps--;
931 cap->session = NULL;
932 old_cap = cap; /* put_cap it w/o locks held */
933 }
934 if (ret < 0)
935 goto out;
936 }
937 ret = 0;
938 out:
939 session->s_cap_iterator = NULL;
940 spin_unlock(&session->s_cap_lock);
941
942 if (last_inode)
943 iput(last_inode);
944 if (old_cap)
945 ceph_put_cap(session->s_mdsc, old_cap);
946
947 return ret;
948 }
949
950 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
951 void *arg)
952 {
953 struct ceph_inode_info *ci = ceph_inode(inode);
954 int drop = 0;
955
956 dout("removing cap %p, ci is %p, inode is %p\n",
957 cap, ci, &ci->vfs_inode);
958 spin_lock(&ci->i_ceph_lock);
959 __ceph_remove_cap(cap);
960 if (!__ceph_is_any_real_caps(ci)) {
961 struct ceph_mds_client *mdsc =
962 ceph_sb_to_client(inode->i_sb)->mdsc;
963
964 spin_lock(&mdsc->cap_dirty_lock);
965 if (!list_empty(&ci->i_dirty_item)) {
966 pr_info(" dropping dirty %s state for %p %lld\n",
967 ceph_cap_string(ci->i_dirty_caps),
968 inode, ceph_ino(inode));
969 ci->i_dirty_caps = 0;
970 list_del_init(&ci->i_dirty_item);
971 drop = 1;
972 }
973 if (!list_empty(&ci->i_flushing_item)) {
974 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
975 ceph_cap_string(ci->i_flushing_caps),
976 inode, ceph_ino(inode));
977 ci->i_flushing_caps = 0;
978 list_del_init(&ci->i_flushing_item);
979 mdsc->num_cap_flushing--;
980 drop = 1;
981 }
982 if (drop && ci->i_wrbuffer_ref) {
983 pr_info(" dropping dirty data for %p %lld\n",
984 inode, ceph_ino(inode));
985 ci->i_wrbuffer_ref = 0;
986 ci->i_wrbuffer_ref_head = 0;
987 drop++;
988 }
989 spin_unlock(&mdsc->cap_dirty_lock);
990 }
991 spin_unlock(&ci->i_ceph_lock);
992 while (drop--)
993 iput(inode);
994 return 0;
995 }
996
997 /*
998 * caller must hold session s_mutex
999 */
1000 static void remove_session_caps(struct ceph_mds_session *session)
1001 {
1002 dout("remove_session_caps on %p\n", session);
1003 iterate_session_caps(session, remove_session_caps_cb, NULL);
1004 BUG_ON(session->s_nr_caps > 0);
1005 BUG_ON(!list_empty(&session->s_cap_flushing));
1006 cleanup_cap_releases(session);
1007 }
1008
1009 /*
1010 * wake up any threads waiting on this session's caps. if the cap is
1011 * old (didn't get renewed on the client reconnect), remove it now.
1012 *
1013 * caller must hold s_mutex.
1014 */
1015 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1016 void *arg)
1017 {
1018 struct ceph_inode_info *ci = ceph_inode(inode);
1019
1020 wake_up_all(&ci->i_cap_wq);
1021 if (arg) {
1022 spin_lock(&ci->i_ceph_lock);
1023 ci->i_wanted_max_size = 0;
1024 ci->i_requested_max_size = 0;
1025 spin_unlock(&ci->i_ceph_lock);
1026 }
1027 return 0;
1028 }
1029
1030 static void wake_up_session_caps(struct ceph_mds_session *session,
1031 int reconnect)
1032 {
1033 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1034 iterate_session_caps(session, wake_up_session_cb,
1035 (void *)(unsigned long)reconnect);
1036 }
1037
1038 /*
1039 * Send periodic message to MDS renewing all currently held caps. The
1040 * ack will reset the expiration for all caps from this session.
1041 *
1042 * caller holds s_mutex
1043 */
1044 static int send_renew_caps(struct ceph_mds_client *mdsc,
1045 struct ceph_mds_session *session)
1046 {
1047 struct ceph_msg *msg;
1048 int state;
1049
1050 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1051 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1052 pr_info("mds%d caps stale\n", session->s_mds);
1053 session->s_renew_requested = jiffies;
1054
1055 /* do not try to renew caps until a recovering mds has reconnected
1056 * with its clients. */
1057 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1058 if (state < CEPH_MDS_STATE_RECONNECT) {
1059 dout("send_renew_caps ignoring mds%d (%s)\n",
1060 session->s_mds, ceph_mds_state_name(state));
1061 return 0;
1062 }
1063
1064 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1065 ceph_mds_state_name(state));
1066 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1067 ++session->s_renew_seq);
1068 if (!msg)
1069 return -ENOMEM;
1070 ceph_con_send(&session->s_con, msg);
1071 return 0;
1072 }
1073
1074 /*
1075 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1076 *
1077 * Called under session->s_mutex
1078 */
1079 static void renewed_caps(struct ceph_mds_client *mdsc,
1080 struct ceph_mds_session *session, int is_renew)
1081 {
1082 int was_stale;
1083 int wake = 0;
1084
1085 spin_lock(&session->s_cap_lock);
1086 was_stale = is_renew && (session->s_cap_ttl == 0 ||
1087 time_after_eq(jiffies, session->s_cap_ttl));
1088
1089 session->s_cap_ttl = session->s_renew_requested +
1090 mdsc->mdsmap->m_session_timeout*HZ;
1091
1092 if (was_stale) {
1093 if (time_before(jiffies, session->s_cap_ttl)) {
1094 pr_info("mds%d caps renewed\n", session->s_mds);
1095 wake = 1;
1096 } else {
1097 pr_info("mds%d caps still stale\n", session->s_mds);
1098 }
1099 }
1100 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1101 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1102 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1103 spin_unlock(&session->s_cap_lock);
1104
1105 if (wake)
1106 wake_up_session_caps(session, 0);
1107 }
1108
1109 /*
1110 * send a session close request
1111 */
1112 static int request_close_session(struct ceph_mds_client *mdsc,
1113 struct ceph_mds_session *session)
1114 {
1115 struct ceph_msg *msg;
1116
1117 dout("request_close_session mds%d state %s seq %lld\n",
1118 session->s_mds, session_state_name(session->s_state),
1119 session->s_seq);
1120 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1121 if (!msg)
1122 return -ENOMEM;
1123 ceph_con_send(&session->s_con, msg);
1124 return 0;
1125 }
1126
1127 /*
1128 * Called with s_mutex held.
1129 */
1130 static int __close_session(struct ceph_mds_client *mdsc,
1131 struct ceph_mds_session *session)
1132 {
1133 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1134 return 0;
1135 session->s_state = CEPH_MDS_SESSION_CLOSING;
1136 return request_close_session(mdsc, session);
1137 }
1138
1139 /*
1140 * Trim old(er) caps.
1141 *
1142 * Because we can't cache an inode without one or more caps, we do
1143 * this indirectly: if a cap is unused, we prune its aliases, at which
1144 * point the inode will hopefully get dropped to.
1145 *
1146 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1147 * memory pressure from the MDS, though, so it needn't be perfect.
1148 */
1149 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1150 {
1151 struct ceph_mds_session *session = arg;
1152 struct ceph_inode_info *ci = ceph_inode(inode);
1153 int used, oissued, mine;
1154
1155 if (session->s_trim_caps <= 0)
1156 return -1;
1157
1158 spin_lock(&ci->i_ceph_lock);
1159 mine = cap->issued | cap->implemented;
1160 used = __ceph_caps_used(ci);
1161 oissued = __ceph_caps_issued_other(ci, cap);
1162
1163 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
1164 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1165 ceph_cap_string(used));
1166 if (ci->i_dirty_caps)
1167 goto out; /* dirty caps */
1168 if ((used & ~oissued) & mine)
1169 goto out; /* we need these caps */
1170
1171 session->s_trim_caps--;
1172 if (oissued) {
1173 /* we aren't the only cap.. just remove us */
1174 __ceph_remove_cap(cap);
1175 } else {
1176 /* try to drop referring dentries */
1177 spin_unlock(&ci->i_ceph_lock);
1178 d_prune_aliases(inode);
1179 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1180 inode, cap, atomic_read(&inode->i_count));
1181 return 0;
1182 }
1183
1184 out:
1185 spin_unlock(&ci->i_ceph_lock);
1186 return 0;
1187 }
1188
1189 /*
1190 * Trim session cap count down to some max number.
1191 */
1192 static int trim_caps(struct ceph_mds_client *mdsc,
1193 struct ceph_mds_session *session,
1194 int max_caps)
1195 {
1196 int trim_caps = session->s_nr_caps - max_caps;
1197
1198 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1199 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1200 if (trim_caps > 0) {
1201 session->s_trim_caps = trim_caps;
1202 iterate_session_caps(session, trim_caps_cb, session);
1203 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1204 session->s_mds, session->s_nr_caps, max_caps,
1205 trim_caps - session->s_trim_caps);
1206 session->s_trim_caps = 0;
1207 }
1208 return 0;
1209 }
1210
1211 /*
1212 * Allocate cap_release messages. If there is a partially full message
1213 * in the queue, try to allocate enough to cover it's remainder, so that
1214 * we can send it immediately.
1215 *
1216 * Called under s_mutex.
1217 */
1218 int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
1219 struct ceph_mds_session *session)
1220 {
1221 struct ceph_msg *msg, *partial = NULL;
1222 struct ceph_mds_cap_release *head;
1223 int err = -ENOMEM;
1224 int extra = mdsc->fsc->mount_options->cap_release_safety;
1225 int num;
1226
1227 dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
1228 extra);
1229
1230 spin_lock(&session->s_cap_lock);
1231
1232 if (!list_empty(&session->s_cap_releases)) {
1233 msg = list_first_entry(&session->s_cap_releases,
1234 struct ceph_msg,
1235 list_head);
1236 head = msg->front.iov_base;
1237 num = le32_to_cpu(head->num);
1238 if (num) {
1239 dout(" partial %p with (%d/%d)\n", msg, num,
1240 (int)CEPH_CAPS_PER_RELEASE);
1241 extra += CEPH_CAPS_PER_RELEASE - num;
1242 partial = msg;
1243 }
1244 }
1245 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1246 spin_unlock(&session->s_cap_lock);
1247 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
1248 GFP_NOFS, false);
1249 if (!msg)
1250 goto out_unlocked;
1251 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1252 (int)msg->front.iov_len);
1253 head = msg->front.iov_base;
1254 head->num = cpu_to_le32(0);
1255 msg->front.iov_len = sizeof(*head);
1256 spin_lock(&session->s_cap_lock);
1257 list_add(&msg->list_head, &session->s_cap_releases);
1258 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1259 }
1260
1261 if (partial) {
1262 head = partial->front.iov_base;
1263 num = le32_to_cpu(head->num);
1264 dout(" queueing partial %p with %d/%d\n", partial, num,
1265 (int)CEPH_CAPS_PER_RELEASE);
1266 list_move_tail(&partial->list_head,
1267 &session->s_cap_releases_done);
1268 session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
1269 }
1270 err = 0;
1271 spin_unlock(&session->s_cap_lock);
1272 out_unlocked:
1273 return err;
1274 }
1275
1276 /*
1277 * flush all dirty inode data to disk.
1278 *
1279 * returns true if we've flushed through want_flush_seq
1280 */
1281 static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
1282 {
1283 int mds, ret = 1;
1284
1285 dout("check_cap_flush want %lld\n", want_flush_seq);
1286 mutex_lock(&mdsc->mutex);
1287 for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
1288 struct ceph_mds_session *session = mdsc->sessions[mds];
1289
1290 if (!session)
1291 continue;
1292 get_session(session);
1293 mutex_unlock(&mdsc->mutex);
1294
1295 mutex_lock(&session->s_mutex);
1296 if (!list_empty(&session->s_cap_flushing)) {
1297 struct ceph_inode_info *ci =
1298 list_entry(session->s_cap_flushing.next,
1299 struct ceph_inode_info,
1300 i_flushing_item);
1301 struct inode *inode = &ci->vfs_inode;
1302
1303 spin_lock(&ci->i_ceph_lock);
1304 if (ci->i_cap_flush_seq <= want_flush_seq) {
1305 dout("check_cap_flush still flushing %p "
1306 "seq %lld <= %lld to mds%d\n", inode,
1307 ci->i_cap_flush_seq, want_flush_seq,
1308 session->s_mds);
1309 ret = 0;
1310 }
1311 spin_unlock(&ci->i_ceph_lock);
1312 }
1313 mutex_unlock(&session->s_mutex);
1314 ceph_put_mds_session(session);
1315
1316 if (!ret)
1317 return ret;
1318 mutex_lock(&mdsc->mutex);
1319 }
1320
1321 mutex_unlock(&mdsc->mutex);
1322 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
1323 return ret;
1324 }
1325
1326 /*
1327 * called under s_mutex
1328 */
1329 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1330 struct ceph_mds_session *session)
1331 {
1332 struct ceph_msg *msg;
1333
1334 dout("send_cap_releases mds%d\n", session->s_mds);
1335 spin_lock(&session->s_cap_lock);
1336 while (!list_empty(&session->s_cap_releases_done)) {
1337 msg = list_first_entry(&session->s_cap_releases_done,
1338 struct ceph_msg, list_head);
1339 list_del_init(&msg->list_head);
1340 spin_unlock(&session->s_cap_lock);
1341 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1342 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1343 ceph_con_send(&session->s_con, msg);
1344 spin_lock(&session->s_cap_lock);
1345 }
1346 spin_unlock(&session->s_cap_lock);
1347 }
1348
1349 static void discard_cap_releases(struct ceph_mds_client *mdsc,
1350 struct ceph_mds_session *session)
1351 {
1352 struct ceph_msg *msg;
1353 struct ceph_mds_cap_release *head;
1354 unsigned num;
1355
1356 dout("discard_cap_releases mds%d\n", session->s_mds);
1357 spin_lock(&session->s_cap_lock);
1358
1359 /* zero out the in-progress message */
1360 msg = list_first_entry(&session->s_cap_releases,
1361 struct ceph_msg, list_head);
1362 head = msg->front.iov_base;
1363 num = le32_to_cpu(head->num);
1364 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num);
1365 head->num = cpu_to_le32(0);
1366 session->s_num_cap_releases += num;
1367
1368 /* requeue completed messages */
1369 while (!list_empty(&session->s_cap_releases_done)) {
1370 msg = list_first_entry(&session->s_cap_releases_done,
1371 struct ceph_msg, list_head);
1372 list_del_init(&msg->list_head);
1373
1374 head = msg->front.iov_base;
1375 num = le32_to_cpu(head->num);
1376 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
1377 num);
1378 session->s_num_cap_releases += num;
1379 head->num = cpu_to_le32(0);
1380 msg->front.iov_len = sizeof(*head);
1381 list_add(&msg->list_head, &session->s_cap_releases);
1382 }
1383
1384 spin_unlock(&session->s_cap_lock);
1385 }
1386
1387 /*
1388 * requests
1389 */
1390
1391 /*
1392 * Create an mds request.
1393 */
1394 struct ceph_mds_request *
1395 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1396 {
1397 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1398
1399 if (!req)
1400 return ERR_PTR(-ENOMEM);
1401
1402 mutex_init(&req->r_fill_mutex);
1403 req->r_mdsc = mdsc;
1404 req->r_started = jiffies;
1405 req->r_resend_mds = -1;
1406 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1407 req->r_fmode = -1;
1408 kref_init(&req->r_kref);
1409 INIT_LIST_HEAD(&req->r_wait);
1410 init_completion(&req->r_completion);
1411 init_completion(&req->r_safe_completion);
1412 INIT_LIST_HEAD(&req->r_unsafe_item);
1413
1414 req->r_op = op;
1415 req->r_direct_mode = mode;
1416 return req;
1417 }
1418
1419 /*
1420 * return oldest (lowest) request, tid in request tree, 0 if none.
1421 *
1422 * called under mdsc->mutex.
1423 */
1424 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1425 {
1426 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1427 return NULL;
1428 return rb_entry(rb_first(&mdsc->request_tree),
1429 struct ceph_mds_request, r_node);
1430 }
1431
1432 static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1433 {
1434 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1435
1436 if (req)
1437 return req->r_tid;
1438 return 0;
1439 }
1440
1441 /*
1442 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1443 * on build_path_from_dentry in fs/cifs/dir.c.
1444 *
1445 * If @stop_on_nosnap, generate path relative to the first non-snapped
1446 * inode.
1447 *
1448 * Encode hidden .snap dirs as a double /, i.e.
1449 * foo/.snap/bar -> foo//bar
1450 */
1451 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1452 int stop_on_nosnap)
1453 {
1454 struct dentry *temp;
1455 char *path;
1456 int len, pos;
1457 unsigned seq;
1458
1459 if (dentry == NULL)
1460 return ERR_PTR(-EINVAL);
1461
1462 retry:
1463 len = 0;
1464 seq = read_seqbegin(&rename_lock);
1465 rcu_read_lock();
1466 for (temp = dentry; !IS_ROOT(temp);) {
1467 struct inode *inode = temp->d_inode;
1468 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1469 len++; /* slash only */
1470 else if (stop_on_nosnap && inode &&
1471 ceph_snap(inode) == CEPH_NOSNAP)
1472 break;
1473 else
1474 len += 1 + temp->d_name.len;
1475 temp = temp->d_parent;
1476 if (temp == NULL) {
1477 rcu_read_unlock();
1478 pr_err("build_path corrupt dentry %p\n", dentry);
1479 return ERR_PTR(-EINVAL);
1480 }
1481 }
1482 rcu_read_unlock();
1483 if (len)
1484 len--; /* no leading '/' */
1485
1486 path = kmalloc(len+1, GFP_NOFS);
1487 if (path == NULL)
1488 return ERR_PTR(-ENOMEM);
1489 pos = len;
1490 path[pos] = 0; /* trailing null */
1491 rcu_read_lock();
1492 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1493 struct inode *inode;
1494
1495 spin_lock(&temp->d_lock);
1496 inode = temp->d_inode;
1497 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1498 dout("build_path path+%d: %p SNAPDIR\n",
1499 pos, temp);
1500 } else if (stop_on_nosnap && inode &&
1501 ceph_snap(inode) == CEPH_NOSNAP) {
1502 spin_unlock(&temp->d_lock);
1503 break;
1504 } else {
1505 pos -= temp->d_name.len;
1506 if (pos < 0) {
1507 spin_unlock(&temp->d_lock);
1508 break;
1509 }
1510 strncpy(path + pos, temp->d_name.name,
1511 temp->d_name.len);
1512 }
1513 spin_unlock(&temp->d_lock);
1514 if (pos)
1515 path[--pos] = '/';
1516 temp = temp->d_parent;
1517 if (temp == NULL) {
1518 rcu_read_unlock();
1519 pr_err("build_path corrupt dentry\n");
1520 kfree(path);
1521 return ERR_PTR(-EINVAL);
1522 }
1523 }
1524 rcu_read_unlock();
1525 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1526 pr_err("build_path did not end path lookup where "
1527 "expected, namelen is %d, pos is %d\n", len, pos);
1528 /* presumably this is only possible if racing with a
1529 rename of one of the parent directories (we can not
1530 lock the dentries above us to prevent this, but
1531 retrying should be harmless) */
1532 kfree(path);
1533 goto retry;
1534 }
1535
1536 *base = ceph_ino(temp->d_inode);
1537 *plen = len;
1538 dout("build_path on %p %d built %llx '%.*s'\n",
1539 dentry, dentry->d_count, *base, len, path);
1540 return path;
1541 }
1542
1543 static int build_dentry_path(struct dentry *dentry,
1544 const char **ppath, int *ppathlen, u64 *pino,
1545 int *pfreepath)
1546 {
1547 char *path;
1548
1549 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1550 *pino = ceph_ino(dentry->d_parent->d_inode);
1551 *ppath = dentry->d_name.name;
1552 *ppathlen = dentry->d_name.len;
1553 return 0;
1554 }
1555 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1556 if (IS_ERR(path))
1557 return PTR_ERR(path);
1558 *ppath = path;
1559 *pfreepath = 1;
1560 return 0;
1561 }
1562
1563 static int build_inode_path(struct inode *inode,
1564 const char **ppath, int *ppathlen, u64 *pino,
1565 int *pfreepath)
1566 {
1567 struct dentry *dentry;
1568 char *path;
1569
1570 if (ceph_snap(inode) == CEPH_NOSNAP) {
1571 *pino = ceph_ino(inode);
1572 *ppathlen = 0;
1573 return 0;
1574 }
1575 dentry = d_find_alias(inode);
1576 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1577 dput(dentry);
1578 if (IS_ERR(path))
1579 return PTR_ERR(path);
1580 *ppath = path;
1581 *pfreepath = 1;
1582 return 0;
1583 }
1584
1585 /*
1586 * request arguments may be specified via an inode *, a dentry *, or
1587 * an explicit ino+path.
1588 */
1589 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1590 const char *rpath, u64 rino,
1591 const char **ppath, int *pathlen,
1592 u64 *ino, int *freepath)
1593 {
1594 int r = 0;
1595
1596 if (rinode) {
1597 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1598 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1599 ceph_snap(rinode));
1600 } else if (rdentry) {
1601 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1602 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1603 *ppath);
1604 } else if (rpath || rino) {
1605 *ino = rino;
1606 *ppath = rpath;
1607 *pathlen = strlen(rpath);
1608 dout(" path %.*s\n", *pathlen, rpath);
1609 }
1610
1611 return r;
1612 }
1613
1614 /*
1615 * called under mdsc->mutex
1616 */
1617 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1618 struct ceph_mds_request *req,
1619 int mds)
1620 {
1621 struct ceph_msg *msg;
1622 struct ceph_mds_request_head *head;
1623 const char *path1 = NULL;
1624 const char *path2 = NULL;
1625 u64 ino1 = 0, ino2 = 0;
1626 int pathlen1 = 0, pathlen2 = 0;
1627 int freepath1 = 0, freepath2 = 0;
1628 int len;
1629 u16 releases;
1630 void *p, *end;
1631 int ret;
1632
1633 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1634 req->r_path1, req->r_ino1.ino,
1635 &path1, &pathlen1, &ino1, &freepath1);
1636 if (ret < 0) {
1637 msg = ERR_PTR(ret);
1638 goto out;
1639 }
1640
1641 ret = set_request_path_attr(NULL, req->r_old_dentry,
1642 req->r_path2, req->r_ino2.ino,
1643 &path2, &pathlen2, &ino2, &freepath2);
1644 if (ret < 0) {
1645 msg = ERR_PTR(ret);
1646 goto out_free1;
1647 }
1648
1649 len = sizeof(*head) +
1650 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
1651
1652 /* calculate (max) length for cap releases */
1653 len += sizeof(struct ceph_mds_request_release) *
1654 (!!req->r_inode_drop + !!req->r_dentry_drop +
1655 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1656 if (req->r_dentry_drop)
1657 len += req->r_dentry->d_name.len;
1658 if (req->r_old_dentry_drop)
1659 len += req->r_old_dentry->d_name.len;
1660
1661 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1662 if (!msg) {
1663 msg = ERR_PTR(-ENOMEM);
1664 goto out_free2;
1665 }
1666
1667 msg->hdr.tid = cpu_to_le64(req->r_tid);
1668
1669 head = msg->front.iov_base;
1670 p = msg->front.iov_base + sizeof(*head);
1671 end = msg->front.iov_base + msg->front.iov_len;
1672
1673 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1674 head->op = cpu_to_le32(req->r_op);
1675 head->caller_uid = cpu_to_le32(req->r_uid);
1676 head->caller_gid = cpu_to_le32(req->r_gid);
1677 head->args = req->r_args;
1678
1679 ceph_encode_filepath(&p, end, ino1, path1);
1680 ceph_encode_filepath(&p, end, ino2, path2);
1681
1682 /* make note of release offset, in case we need to replay */
1683 req->r_request_release_offset = p - msg->front.iov_base;
1684
1685 /* cap releases */
1686 releases = 0;
1687 if (req->r_inode_drop)
1688 releases += ceph_encode_inode_release(&p,
1689 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1690 mds, req->r_inode_drop, req->r_inode_unless, 0);
1691 if (req->r_dentry_drop)
1692 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1693 mds, req->r_dentry_drop, req->r_dentry_unless);
1694 if (req->r_old_dentry_drop)
1695 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1696 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1697 if (req->r_old_inode_drop)
1698 releases += ceph_encode_inode_release(&p,
1699 req->r_old_dentry->d_inode,
1700 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1701 head->num_releases = cpu_to_le16(releases);
1702
1703 BUG_ON(p > end);
1704 msg->front.iov_len = p - msg->front.iov_base;
1705 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1706
1707 msg->pages = req->r_pages;
1708 msg->nr_pages = req->r_num_pages;
1709 msg->hdr.data_len = cpu_to_le32(req->r_data_len);
1710 msg->hdr.data_off = cpu_to_le16(0);
1711
1712 out_free2:
1713 if (freepath2)
1714 kfree((char *)path2);
1715 out_free1:
1716 if (freepath1)
1717 kfree((char *)path1);
1718 out:
1719 return msg;
1720 }
1721
1722 /*
1723 * called under mdsc->mutex if error, under no mutex if
1724 * success.
1725 */
1726 static void complete_request(struct ceph_mds_client *mdsc,
1727 struct ceph_mds_request *req)
1728 {
1729 if (req->r_callback)
1730 req->r_callback(mdsc, req);
1731 else
1732 complete_all(&req->r_completion);
1733 }
1734
1735 /*
1736 * called under mdsc->mutex
1737 */
1738 static int __prepare_send_request(struct ceph_mds_client *mdsc,
1739 struct ceph_mds_request *req,
1740 int mds)
1741 {
1742 struct ceph_mds_request_head *rhead;
1743 struct ceph_msg *msg;
1744 int flags = 0;
1745
1746 req->r_attempts++;
1747 if (req->r_inode) {
1748 struct ceph_cap *cap =
1749 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
1750
1751 if (cap)
1752 req->r_sent_on_mseq = cap->mseq;
1753 else
1754 req->r_sent_on_mseq = -1;
1755 }
1756 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
1757 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
1758
1759 if (req->r_got_unsafe) {
1760 /*
1761 * Replay. Do not regenerate message (and rebuild
1762 * paths, etc.); just use the original message.
1763 * Rebuilding paths will break for renames because
1764 * d_move mangles the src name.
1765 */
1766 msg = req->r_request;
1767 rhead = msg->front.iov_base;
1768
1769 flags = le32_to_cpu(rhead->flags);
1770 flags |= CEPH_MDS_FLAG_REPLAY;
1771 rhead->flags = cpu_to_le32(flags);
1772
1773 if (req->r_target_inode)
1774 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
1775
1776 rhead->num_retry = req->r_attempts - 1;
1777
1778 /* remove cap/dentry releases from message */
1779 rhead->num_releases = 0;
1780 msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset);
1781 msg->front.iov_len = req->r_request_release_offset;
1782 return 0;
1783 }
1784
1785 if (req->r_request) {
1786 ceph_msg_put(req->r_request);
1787 req->r_request = NULL;
1788 }
1789 msg = create_request_message(mdsc, req, mds);
1790 if (IS_ERR(msg)) {
1791 req->r_err = PTR_ERR(msg);
1792 complete_request(mdsc, req);
1793 return PTR_ERR(msg);
1794 }
1795 req->r_request = msg;
1796
1797 rhead = msg->front.iov_base;
1798 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
1799 if (req->r_got_unsafe)
1800 flags |= CEPH_MDS_FLAG_REPLAY;
1801 if (req->r_locked_dir)
1802 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
1803 rhead->flags = cpu_to_le32(flags);
1804 rhead->num_fwd = req->r_num_fwd;
1805 rhead->num_retry = req->r_attempts - 1;
1806 rhead->ino = 0;
1807
1808 dout(" r_locked_dir = %p\n", req->r_locked_dir);
1809 return 0;
1810 }
1811
1812 /*
1813 * send request, or put it on the appropriate wait list.
1814 */
1815 static int __do_request(struct ceph_mds_client *mdsc,
1816 struct ceph_mds_request *req)
1817 {
1818 struct ceph_mds_session *session = NULL;
1819 int mds = -1;
1820 int err = -EAGAIN;
1821
1822 if (req->r_err || req->r_got_result)
1823 goto out;
1824
1825 if (req->r_timeout &&
1826 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
1827 dout("do_request timed out\n");
1828 err = -EIO;
1829 goto finish;
1830 }
1831
1832 put_request_session(req);
1833
1834 mds = __choose_mds(mdsc, req);
1835 if (mds < 0 ||
1836 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
1837 dout("do_request no mds or not active, waiting for map\n");
1838 list_add(&req->r_wait, &mdsc->waiting_for_map);
1839 goto out;
1840 }
1841
1842 /* get, open session */
1843 session = __ceph_lookup_mds_session(mdsc, mds);
1844 if (!session) {
1845 session = register_session(mdsc, mds);
1846 if (IS_ERR(session)) {
1847 err = PTR_ERR(session);
1848 goto finish;
1849 }
1850 }
1851 req->r_session = get_session(session);
1852
1853 dout("do_request mds%d session %p state %s\n", mds, session,
1854 session_state_name(session->s_state));
1855 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
1856 session->s_state != CEPH_MDS_SESSION_HUNG) {
1857 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1858 session->s_state == CEPH_MDS_SESSION_CLOSING)
1859 __open_session(mdsc, session);
1860 list_add(&req->r_wait, &session->s_waiting);
1861 goto out_session;
1862 }
1863
1864 /* send request */
1865 req->r_resend_mds = -1; /* forget any previous mds hint */
1866
1867 if (req->r_request_started == 0) /* note request start time */
1868 req->r_request_started = jiffies;
1869
1870 err = __prepare_send_request(mdsc, req, mds);
1871 if (!err) {
1872 ceph_msg_get(req->r_request);
1873 ceph_con_send(&session->s_con, req->r_request);
1874 }
1875
1876 out_session:
1877 ceph_put_mds_session(session);
1878 out:
1879 return err;
1880
1881 finish:
1882 req->r_err = err;
1883 complete_request(mdsc, req);
1884 goto out;
1885 }
1886
1887 /*
1888 * called under mdsc->mutex
1889 */
1890 static void __wake_requests(struct ceph_mds_client *mdsc,
1891 struct list_head *head)
1892 {
1893 struct ceph_mds_request *req, *nreq;
1894
1895 list_for_each_entry_safe(req, nreq, head, r_wait) {
1896 list_del_init(&req->r_wait);
1897 __do_request(mdsc, req);
1898 }
1899 }
1900
1901 /*
1902 * Wake up threads with requests pending for @mds, so that they can
1903 * resubmit their requests to a possibly different mds.
1904 */
1905 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
1906 {
1907 struct ceph_mds_request *req;
1908 struct rb_node *p;
1909
1910 dout("kick_requests mds%d\n", mds);
1911 for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
1912 req = rb_entry(p, struct ceph_mds_request, r_node);
1913 if (req->r_got_unsafe)
1914 continue;
1915 if (req->r_session &&
1916 req->r_session->s_mds == mds) {
1917 dout(" kicking tid %llu\n", req->r_tid);
1918 __do_request(mdsc, req);
1919 }
1920 }
1921 }
1922
1923 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
1924 struct ceph_mds_request *req)
1925 {
1926 dout("submit_request on %p\n", req);
1927 mutex_lock(&mdsc->mutex);
1928 __register_request(mdsc, req, NULL);
1929 __do_request(mdsc, req);
1930 mutex_unlock(&mdsc->mutex);
1931 }
1932
1933 /*
1934 * Synchrously perform an mds request. Take care of all of the
1935 * session setup, forwarding, retry details.
1936 */
1937 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
1938 struct inode *dir,
1939 struct ceph_mds_request *req)
1940 {
1941 int err;
1942
1943 dout("do_request on %p\n", req);
1944
1945 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
1946 if (req->r_inode)
1947 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
1948 if (req->r_locked_dir)
1949 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
1950 if (req->r_old_dentry)
1951 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
1952 CEPH_CAP_PIN);
1953
1954 /* issue */
1955 mutex_lock(&mdsc->mutex);
1956 __register_request(mdsc, req, dir);
1957 __do_request(mdsc, req);
1958
1959 if (req->r_err) {
1960 err = req->r_err;
1961 __unregister_request(mdsc, req);
1962 dout("do_request early error %d\n", err);
1963 goto out;
1964 }
1965
1966 /* wait */
1967 mutex_unlock(&mdsc->mutex);
1968 dout("do_request waiting\n");
1969 if (req->r_timeout) {
1970 err = (long)wait_for_completion_killable_timeout(
1971 &req->r_completion, req->r_timeout);
1972 if (err == 0)
1973 err = -EIO;
1974 } else {
1975 err = wait_for_completion_killable(&req->r_completion);
1976 }
1977 dout("do_request waited, got %d\n", err);
1978 mutex_lock(&mdsc->mutex);
1979
1980 /* only abort if we didn't race with a real reply */
1981 if (req->r_got_result) {
1982 err = le32_to_cpu(req->r_reply_info.head->result);
1983 } else if (err < 0) {
1984 dout("aborted request %lld with %d\n", req->r_tid, err);
1985
1986 /*
1987 * ensure we aren't running concurrently with
1988 * ceph_fill_trace or ceph_readdir_prepopulate, which
1989 * rely on locks (dir mutex) held by our caller.
1990 */
1991 mutex_lock(&req->r_fill_mutex);
1992 req->r_err = err;
1993 req->r_aborted = true;
1994 mutex_unlock(&req->r_fill_mutex);
1995
1996 if (req->r_locked_dir &&
1997 (req->r_op & CEPH_MDS_OP_WRITE))
1998 ceph_invalidate_dir_request(req);
1999 } else {
2000 err = req->r_err;
2001 }
2002
2003 out:
2004 mutex_unlock(&mdsc->mutex);
2005 dout("do_request %p done, result %d\n", req, err);
2006 return err;
2007 }
2008
2009 /*
2010 * Invalidate dir D_COMPLETE, dentry lease state on an aborted MDS
2011 * namespace request.
2012 */
2013 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2014 {
2015 struct inode *inode = req->r_locked_dir;
2016 struct ceph_inode_info *ci = ceph_inode(inode);
2017
2018 dout("invalidate_dir_request %p (D_COMPLETE, lease(s))\n", inode);
2019 spin_lock(&ci->i_ceph_lock);
2020 ceph_dir_clear_complete(inode);
2021 ci->i_release_count++;
2022 spin_unlock(&ci->i_ceph_lock);
2023
2024 if (req->r_dentry)
2025 ceph_invalidate_dentry_lease(req->r_dentry);
2026 if (req->r_old_dentry)
2027 ceph_invalidate_dentry_lease(req->r_old_dentry);
2028 }
2029
2030 /*
2031 * Handle mds reply.
2032 *
2033 * We take the session mutex and parse and process the reply immediately.
2034 * This preserves the logical ordering of replies, capabilities, etc., sent
2035 * by the MDS as they are applied to our local cache.
2036 */
2037 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2038 {
2039 struct ceph_mds_client *mdsc = session->s_mdsc;
2040 struct ceph_mds_request *req;
2041 struct ceph_mds_reply_head *head = msg->front.iov_base;
2042 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2043 u64 tid;
2044 int err, result;
2045 int mds = session->s_mds;
2046
2047 if (msg->front.iov_len < sizeof(*head)) {
2048 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2049 ceph_msg_dump(msg);
2050 return;
2051 }
2052
2053 /* get request, session */
2054 tid = le64_to_cpu(msg->hdr.tid);
2055 mutex_lock(&mdsc->mutex);
2056 req = __lookup_request(mdsc, tid);
2057 if (!req) {
2058 dout("handle_reply on unknown tid %llu\n", tid);
2059 mutex_unlock(&mdsc->mutex);
2060 return;
2061 }
2062 dout("handle_reply %p\n", req);
2063
2064 /* correct session? */
2065 if (req->r_session != session) {
2066 pr_err("mdsc_handle_reply got %llu on session mds%d"
2067 " not mds%d\n", tid, session->s_mds,
2068 req->r_session ? req->r_session->s_mds : -1);
2069 mutex_unlock(&mdsc->mutex);
2070 goto out;
2071 }
2072
2073 /* dup? */
2074 if ((req->r_got_unsafe && !head->safe) ||
2075 (req->r_got_safe && head->safe)) {
2076 pr_warning("got a dup %s reply on %llu from mds%d\n",
2077 head->safe ? "safe" : "unsafe", tid, mds);
2078 mutex_unlock(&mdsc->mutex);
2079 goto out;
2080 }
2081 if (req->r_got_safe && !head->safe) {
2082 pr_warning("got unsafe after safe on %llu from mds%d\n",
2083 tid, mds);
2084 mutex_unlock(&mdsc->mutex);
2085 goto out;
2086 }
2087
2088 result = le32_to_cpu(head->result);
2089
2090 /*
2091 * Handle an ESTALE
2092 * if we're not talking to the authority, send to them
2093 * if the authority has changed while we weren't looking,
2094 * send to new authority
2095 * Otherwise we just have to return an ESTALE
2096 */
2097 if (result == -ESTALE) {
2098 dout("got ESTALE on request %llu", req->r_tid);
2099 if (!req->r_inode) {
2100 /* do nothing; not an authority problem */
2101 } else if (req->r_direct_mode != USE_AUTH_MDS) {
2102 dout("not using auth, setting for that now");
2103 req->r_direct_mode = USE_AUTH_MDS;
2104 __do_request(mdsc, req);
2105 mutex_unlock(&mdsc->mutex);
2106 goto out;
2107 } else {
2108 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
2109 struct ceph_cap *cap = NULL;
2110
2111 if (req->r_session)
2112 cap = ceph_get_cap_for_mds(ci,
2113 req->r_session->s_mds);
2114
2115 dout("already using auth");
2116 if ((!cap || cap != ci->i_auth_cap) ||
2117 (cap->mseq != req->r_sent_on_mseq)) {
2118 dout("but cap changed, so resending");
2119 __do_request(mdsc, req);
2120 mutex_unlock(&mdsc->mutex);
2121 goto out;
2122 }
2123 }
2124 dout("have to return ESTALE on request %llu", req->r_tid);
2125 }
2126
2127
2128 if (head->safe) {
2129 req->r_got_safe = true;
2130 __unregister_request(mdsc, req);
2131 complete_all(&req->r_safe_completion);
2132
2133 if (req->r_got_unsafe) {
2134 /*
2135 * We already handled the unsafe response, now do the
2136 * cleanup. No need to examine the response; the MDS
2137 * doesn't include any result info in the safe
2138 * response. And even if it did, there is nothing
2139 * useful we could do with a revised return value.
2140 */
2141 dout("got safe reply %llu, mds%d\n", tid, mds);
2142 list_del_init(&req->r_unsafe_item);
2143
2144 /* last unsafe request during umount? */
2145 if (mdsc->stopping && !__get_oldest_req(mdsc))
2146 complete_all(&mdsc->safe_umount_waiters);
2147 mutex_unlock(&mdsc->mutex);
2148 goto out;
2149 }
2150 } else {
2151 req->r_got_unsafe = true;
2152 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2153 }
2154
2155 dout("handle_reply tid %lld result %d\n", tid, result);
2156 rinfo = &req->r_reply_info;
2157 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2158 mutex_unlock(&mdsc->mutex);
2159
2160 mutex_lock(&session->s_mutex);
2161 if (err < 0) {
2162 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2163 ceph_msg_dump(msg);
2164 goto out_err;
2165 }
2166
2167 /* snap trace */
2168 if (rinfo->snapblob_len) {
2169 down_write(&mdsc->snap_rwsem);
2170 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2171 rinfo->snapblob + rinfo->snapblob_len,
2172 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
2173 downgrade_write(&mdsc->snap_rwsem);
2174 } else {
2175 down_read(&mdsc->snap_rwsem);
2176 }
2177
2178 /* insert trace into our cache */
2179 mutex_lock(&req->r_fill_mutex);
2180 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2181 if (err == 0) {
2182 if (result == 0 && req->r_op != CEPH_MDS_OP_GETFILELOCK &&
2183 rinfo->dir_nr)
2184 ceph_readdir_prepopulate(req, req->r_session);
2185 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2186 }
2187 mutex_unlock(&req->r_fill_mutex);
2188
2189 up_read(&mdsc->snap_rwsem);
2190 out_err:
2191 mutex_lock(&mdsc->mutex);
2192 if (!req->r_aborted) {
2193 if (err) {
2194 req->r_err = err;
2195 } else {
2196 req->r_reply = msg;
2197 ceph_msg_get(msg);
2198 req->r_got_result = true;
2199 }
2200 } else {
2201 dout("reply arrived after request %lld was aborted\n", tid);
2202 }
2203 mutex_unlock(&mdsc->mutex);
2204
2205 ceph_add_cap_releases(mdsc, req->r_session);
2206 mutex_unlock(&session->s_mutex);
2207
2208 /* kick calling process */
2209 complete_request(mdsc, req);
2210 out:
2211 ceph_mdsc_put_request(req);
2212 return;
2213 }
2214
2215
2216
2217 /*
2218 * handle mds notification that our request has been forwarded.
2219 */
2220 static void handle_forward(struct ceph_mds_client *mdsc,
2221 struct ceph_mds_session *session,
2222 struct ceph_msg *msg)
2223 {
2224 struct ceph_mds_request *req;
2225 u64 tid = le64_to_cpu(msg->hdr.tid);
2226 u32 next_mds;
2227 u32 fwd_seq;
2228 int err = -EINVAL;
2229 void *p = msg->front.iov_base;
2230 void *end = p + msg->front.iov_len;
2231
2232 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2233 next_mds = ceph_decode_32(&p);
2234 fwd_seq = ceph_decode_32(&p);
2235
2236 mutex_lock(&mdsc->mutex);
2237 req = __lookup_request(mdsc, tid);
2238 if (!req) {
2239 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2240 goto out; /* dup reply? */
2241 }
2242
2243 if (req->r_aborted) {
2244 dout("forward tid %llu aborted, unregistering\n", tid);
2245 __unregister_request(mdsc, req);
2246 } else if (fwd_seq <= req->r_num_fwd) {
2247 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2248 tid, next_mds, req->r_num_fwd, fwd_seq);
2249 } else {
2250 /* resend. forward race not possible; mds would drop */
2251 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2252 BUG_ON(req->r_err);
2253 BUG_ON(req->r_got_result);
2254 req->r_num_fwd = fwd_seq;
2255 req->r_resend_mds = next_mds;
2256 put_request_session(req);
2257 __do_request(mdsc, req);
2258 }
2259 ceph_mdsc_put_request(req);
2260 out:
2261 mutex_unlock(&mdsc->mutex);
2262 return;
2263
2264 bad:
2265 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2266 }
2267
2268 /*
2269 * handle a mds session control message
2270 */
2271 static void handle_session(struct ceph_mds_session *session,
2272 struct ceph_msg *msg)
2273 {
2274 struct ceph_mds_client *mdsc = session->s_mdsc;
2275 u32 op;
2276 u64 seq;
2277 int mds = session->s_mds;
2278 struct ceph_mds_session_head *h = msg->front.iov_base;
2279 int wake = 0;
2280
2281 /* decode */
2282 if (msg->front.iov_len != sizeof(*h))
2283 goto bad;
2284 op = le32_to_cpu(h->op);
2285 seq = le64_to_cpu(h->seq);
2286
2287 mutex_lock(&mdsc->mutex);
2288 if (op == CEPH_SESSION_CLOSE)
2289 __unregister_session(mdsc, session);
2290 /* FIXME: this ttl calculation is generous */
2291 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2292 mutex_unlock(&mdsc->mutex);
2293
2294 mutex_lock(&session->s_mutex);
2295
2296 dout("handle_session mds%d %s %p state %s seq %llu\n",
2297 mds, ceph_session_op_name(op), session,
2298 session_state_name(session->s_state), seq);
2299
2300 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2301 session->s_state = CEPH_MDS_SESSION_OPEN;
2302 pr_info("mds%d came back\n", session->s_mds);
2303 }
2304
2305 switch (op) {
2306 case CEPH_SESSION_OPEN:
2307 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2308 pr_info("mds%d reconnect success\n", session->s_mds);
2309 session->s_state = CEPH_MDS_SESSION_OPEN;
2310 renewed_caps(mdsc, session, 0);
2311 wake = 1;
2312 if (mdsc->stopping)
2313 __close_session(mdsc, session);
2314 break;
2315
2316 case CEPH_SESSION_RENEWCAPS:
2317 if (session->s_renew_seq == seq)
2318 renewed_caps(mdsc, session, 1);
2319 break;
2320
2321 case CEPH_SESSION_CLOSE:
2322 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2323 pr_info("mds%d reconnect denied\n", session->s_mds);
2324 remove_session_caps(session);
2325 wake = 1; /* for good measure */
2326 wake_up_all(&mdsc->session_close_wq);
2327 kick_requests(mdsc, mds);
2328 break;
2329
2330 case CEPH_SESSION_STALE:
2331 pr_info("mds%d caps went stale, renewing\n",
2332 session->s_mds);
2333 spin_lock(&session->s_gen_ttl_lock);
2334 session->s_cap_gen++;
2335 session->s_cap_ttl = 0;
2336 spin_unlock(&session->s_gen_ttl_lock);
2337 send_renew_caps(mdsc, session);
2338 break;
2339
2340 case CEPH_SESSION_RECALL_STATE:
2341 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2342 break;
2343
2344 default:
2345 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2346 WARN_ON(1);
2347 }
2348
2349 mutex_unlock(&session->s_mutex);
2350 if (wake) {
2351 mutex_lock(&mdsc->mutex);
2352 __wake_requests(mdsc, &session->s_waiting);
2353 mutex_unlock(&mdsc->mutex);
2354 }
2355 return;
2356
2357 bad:
2358 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2359 (int)msg->front.iov_len);
2360 ceph_msg_dump(msg);
2361 return;
2362 }
2363
2364
2365 /*
2366 * called under session->mutex.
2367 */
2368 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2369 struct ceph_mds_session *session)
2370 {
2371 struct ceph_mds_request *req, *nreq;
2372 int err;
2373
2374 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2375
2376 mutex_lock(&mdsc->mutex);
2377 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2378 err = __prepare_send_request(mdsc, req, session->s_mds);
2379 if (!err) {
2380 ceph_msg_get(req->r_request);
2381 ceph_con_send(&session->s_con, req->r_request);
2382 }
2383 }
2384 mutex_unlock(&mdsc->mutex);
2385 }
2386
2387 /*
2388 * Encode information about a cap for a reconnect with the MDS.
2389 */
2390 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2391 void *arg)
2392 {
2393 union {
2394 struct ceph_mds_cap_reconnect v2;
2395 struct ceph_mds_cap_reconnect_v1 v1;
2396 } rec;
2397 size_t reclen;
2398 struct ceph_inode_info *ci;
2399 struct ceph_reconnect_state *recon_state = arg;
2400 struct ceph_pagelist *pagelist = recon_state->pagelist;
2401 char *path;
2402 int pathlen, err;
2403 u64 pathbase;
2404 struct dentry *dentry;
2405
2406 ci = cap->ci;
2407
2408 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2409 inode, ceph_vinop(inode), cap, cap->cap_id,
2410 ceph_cap_string(cap->issued));
2411 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2412 if (err)
2413 return err;
2414
2415 dentry = d_find_alias(inode);
2416 if (dentry) {
2417 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2418 if (IS_ERR(path)) {
2419 err = PTR_ERR(path);
2420 goto out_dput;
2421 }
2422 } else {
2423 path = NULL;
2424 pathlen = 0;
2425 }
2426 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2427 if (err)
2428 goto out_free;
2429
2430 spin_lock(&ci->i_ceph_lock);
2431 cap->seq = 0; /* reset cap seq */
2432 cap->issue_seq = 0; /* and issue_seq */
2433
2434 if (recon_state->flock) {
2435 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2436 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2437 rec.v2.issued = cpu_to_le32(cap->issued);
2438 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2439 rec.v2.pathbase = cpu_to_le64(pathbase);
2440 rec.v2.flock_len = 0;
2441 reclen = sizeof(rec.v2);
2442 } else {
2443 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2444 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2445 rec.v1.issued = cpu_to_le32(cap->issued);
2446 rec.v1.size = cpu_to_le64(inode->i_size);
2447 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2448 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2449 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2450 rec.v1.pathbase = cpu_to_le64(pathbase);
2451 reclen = sizeof(rec.v1);
2452 }
2453 spin_unlock(&ci->i_ceph_lock);
2454
2455 if (recon_state->flock) {
2456 int num_fcntl_locks, num_flock_locks;
2457 struct ceph_pagelist_cursor trunc_point;
2458
2459 ceph_pagelist_set_cursor(pagelist, &trunc_point);
2460 do {
2461 lock_flocks();
2462 ceph_count_locks(inode, &num_fcntl_locks,
2463 &num_flock_locks);
2464 rec.v2.flock_len = (2*sizeof(u32) +
2465 (num_fcntl_locks+num_flock_locks) *
2466 sizeof(struct ceph_filelock));
2467 unlock_flocks();
2468
2469 /* pre-alloc pagelist */
2470 ceph_pagelist_truncate(pagelist, &trunc_point);
2471 err = ceph_pagelist_append(pagelist, &rec, reclen);
2472 if (!err)
2473 err = ceph_pagelist_reserve(pagelist,
2474 rec.v2.flock_len);
2475
2476 /* encode locks */
2477 if (!err) {
2478 lock_flocks();
2479 err = ceph_encode_locks(inode,
2480 pagelist,
2481 num_fcntl_locks,
2482 num_flock_locks);
2483 unlock_flocks();
2484 }
2485 } while (err == -ENOSPC);
2486 } else {
2487 err = ceph_pagelist_append(pagelist, &rec, reclen);
2488 }
2489
2490 out_free:
2491 kfree(path);
2492 out_dput:
2493 dput(dentry);
2494 return err;
2495 }
2496
2497
2498 /*
2499 * If an MDS fails and recovers, clients need to reconnect in order to
2500 * reestablish shared state. This includes all caps issued through
2501 * this session _and_ the snap_realm hierarchy. Because it's not
2502 * clear which snap realms the mds cares about, we send everything we
2503 * know about.. that ensures we'll then get any new info the
2504 * recovering MDS might have.
2505 *
2506 * This is a relatively heavyweight operation, but it's rare.
2507 *
2508 * called with mdsc->mutex held.
2509 */
2510 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2511 struct ceph_mds_session *session)
2512 {
2513 struct ceph_msg *reply;
2514 struct rb_node *p;
2515 int mds = session->s_mds;
2516 int err = -ENOMEM;
2517 struct ceph_pagelist *pagelist;
2518 struct ceph_reconnect_state recon_state;
2519
2520 pr_info("mds%d reconnect start\n", mds);
2521
2522 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2523 if (!pagelist)
2524 goto fail_nopagelist;
2525 ceph_pagelist_init(pagelist);
2526
2527 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
2528 if (!reply)
2529 goto fail_nomsg;
2530
2531 mutex_lock(&session->s_mutex);
2532 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2533 session->s_seq = 0;
2534
2535 ceph_con_open(&session->s_con,
2536 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2537
2538 /* replay unsafe requests */
2539 replay_unsafe_requests(mdsc, session);
2540
2541 down_read(&mdsc->snap_rwsem);
2542
2543 dout("session %p state %s\n", session,
2544 session_state_name(session->s_state));
2545
2546 /* drop old cap expires; we're about to reestablish that state */
2547 discard_cap_releases(mdsc, session);
2548
2549 /* traverse this session's caps */
2550 err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps);
2551 if (err)
2552 goto fail;
2553
2554 recon_state.pagelist = pagelist;
2555 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2556 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2557 if (err < 0)
2558 goto fail;
2559
2560 /*
2561 * snaprealms. we provide mds with the ino, seq (version), and
2562 * parent for all of our realms. If the mds has any newer info,
2563 * it will tell us.
2564 */
2565 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2566 struct ceph_snap_realm *realm =
2567 rb_entry(p, struct ceph_snap_realm, node);
2568 struct ceph_mds_snaprealm_reconnect sr_rec;
2569
2570 dout(" adding snap realm %llx seq %lld parent %llx\n",
2571 realm->ino, realm->seq, realm->parent_ino);
2572 sr_rec.ino = cpu_to_le64(realm->ino);
2573 sr_rec.seq = cpu_to_le64(realm->seq);
2574 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2575 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2576 if (err)
2577 goto fail;
2578 }
2579
2580 reply->pagelist = pagelist;
2581 if (recon_state.flock)
2582 reply->hdr.version = cpu_to_le16(2);
2583 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2584 reply->nr_pages = calc_pages_for(0, pagelist->length);
2585 ceph_con_send(&session->s_con, reply);
2586
2587 mutex_unlock(&session->s_mutex);
2588
2589 mutex_lock(&mdsc->mutex);
2590 __wake_requests(mdsc, &session->s_waiting);
2591 mutex_unlock(&mdsc->mutex);
2592
2593 up_read(&mdsc->snap_rwsem);
2594 return;
2595
2596 fail:
2597 ceph_msg_put(reply);
2598 up_read(&mdsc->snap_rwsem);
2599 mutex_unlock(&session->s_mutex);
2600 fail_nomsg:
2601 ceph_pagelist_release(pagelist);
2602 kfree(pagelist);
2603 fail_nopagelist:
2604 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
2605 return;
2606 }
2607
2608
2609 /*
2610 * compare old and new mdsmaps, kicking requests
2611 * and closing out old connections as necessary
2612 *
2613 * called under mdsc->mutex.
2614 */
2615 static void check_new_map(struct ceph_mds_client *mdsc,
2616 struct ceph_mdsmap *newmap,
2617 struct ceph_mdsmap *oldmap)
2618 {
2619 int i;
2620 int oldstate, newstate;
2621 struct ceph_mds_session *s;
2622
2623 dout("check_new_map new %u old %u\n",
2624 newmap->m_epoch, oldmap->m_epoch);
2625
2626 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2627 if (mdsc->sessions[i] == NULL)
2628 continue;
2629 s = mdsc->sessions[i];
2630 oldstate = ceph_mdsmap_get_state(oldmap, i);
2631 newstate = ceph_mdsmap_get_state(newmap, i);
2632
2633 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2634 i, ceph_mds_state_name(oldstate),
2635 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2636 ceph_mds_state_name(newstate),
2637 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
2638 session_state_name(s->s_state));
2639
2640 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
2641 ceph_mdsmap_get_addr(newmap, i),
2642 sizeof(struct ceph_entity_addr))) {
2643 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2644 /* the session never opened, just close it
2645 * out now */
2646 __wake_requests(mdsc, &s->s_waiting);
2647 __unregister_session(mdsc, s);
2648 } else {
2649 /* just close it */
2650 mutex_unlock(&mdsc->mutex);
2651 mutex_lock(&s->s_mutex);
2652 mutex_lock(&mdsc->mutex);
2653 ceph_con_close(&s->s_con);
2654 mutex_unlock(&s->s_mutex);
2655 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2656 }
2657
2658 /* kick any requests waiting on the recovering mds */
2659 kick_requests(mdsc, i);
2660 } else if (oldstate == newstate) {
2661 continue; /* nothing new with this mds */
2662 }
2663
2664 /*
2665 * send reconnect?
2666 */
2667 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
2668 newstate >= CEPH_MDS_STATE_RECONNECT) {
2669 mutex_unlock(&mdsc->mutex);
2670 send_mds_reconnect(mdsc, s);
2671 mutex_lock(&mdsc->mutex);
2672 }
2673
2674 /*
2675 * kick request on any mds that has gone active.
2676 */
2677 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
2678 newstate >= CEPH_MDS_STATE_ACTIVE) {
2679 if (oldstate != CEPH_MDS_STATE_CREATING &&
2680 oldstate != CEPH_MDS_STATE_STARTING)
2681 pr_info("mds%d recovery completed\n", s->s_mds);
2682 kick_requests(mdsc, i);
2683 ceph_kick_flushing_caps(mdsc, s);
2684 wake_up_session_caps(s, 1);
2685 }
2686 }
2687
2688 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
2689 s = mdsc->sessions[i];
2690 if (!s)
2691 continue;
2692 if (!ceph_mdsmap_is_laggy(newmap, i))
2693 continue;
2694 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2695 s->s_state == CEPH_MDS_SESSION_HUNG ||
2696 s->s_state == CEPH_MDS_SESSION_CLOSING) {
2697 dout(" connecting to export targets of laggy mds%d\n",
2698 i);
2699 __open_export_target_sessions(mdsc, s);
2700 }
2701 }
2702 }
2703
2704
2705
2706 /*
2707 * leases
2708 */
2709
2710 /*
2711 * caller must hold session s_mutex, dentry->d_lock
2712 */
2713 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
2714 {
2715 struct ceph_dentry_info *di = ceph_dentry(dentry);
2716
2717 ceph_put_mds_session(di->lease_session);
2718 di->lease_session = NULL;
2719 }
2720
2721 static void handle_lease(struct ceph_mds_client *mdsc,
2722 struct ceph_mds_session *session,
2723 struct ceph_msg *msg)
2724 {
2725 struct super_block *sb = mdsc->fsc->sb;
2726 struct inode *inode;
2727 struct dentry *parent, *dentry;
2728 struct ceph_dentry_info *di;
2729 int mds = session->s_mds;
2730 struct ceph_mds_lease *h = msg->front.iov_base;
2731 u32 seq;
2732 struct ceph_vino vino;
2733 struct qstr dname;
2734 int release = 0;
2735
2736 dout("handle_lease from mds%d\n", mds);
2737
2738 /* decode */
2739 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
2740 goto bad;
2741 vino.ino = le64_to_cpu(h->ino);
2742 vino.snap = CEPH_NOSNAP;
2743 seq = le32_to_cpu(h->seq);
2744 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
2745 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
2746 if (dname.len != get_unaligned_le32(h+1))
2747 goto bad;
2748
2749 mutex_lock(&session->s_mutex);
2750 session->s_seq++;
2751
2752 /* lookup inode */
2753 inode = ceph_find_inode(sb, vino);
2754 dout("handle_lease %s, ino %llx %p %.*s\n",
2755 ceph_lease_op_name(h->action), vino.ino, inode,
2756 dname.len, dname.name);
2757 if (inode == NULL) {
2758 dout("handle_lease no inode %llx\n", vino.ino);
2759 goto release;
2760 }
2761
2762 /* dentry */
2763 parent = d_find_alias(inode);
2764 if (!parent) {
2765 dout("no parent dentry on inode %p\n", inode);
2766 WARN_ON(1);
2767 goto release; /* hrm... */
2768 }
2769 dname.hash = full_name_hash(dname.name, dname.len);
2770 dentry = d_lookup(parent, &dname);
2771 dput(parent);
2772 if (!dentry)
2773 goto release;
2774
2775 spin_lock(&dentry->d_lock);
2776 di = ceph_dentry(dentry);
2777 switch (h->action) {
2778 case CEPH_MDS_LEASE_REVOKE:
2779 if (di->lease_session == session) {
2780 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
2781 h->seq = cpu_to_le32(di->lease_seq);
2782 __ceph_mdsc_drop_dentry_lease(dentry);
2783 }
2784 release = 1;
2785 break;
2786
2787 case CEPH_MDS_LEASE_RENEW:
2788 if (di->lease_session == session &&
2789 di->lease_gen == session->s_cap_gen &&
2790 di->lease_renew_from &&
2791 di->lease_renew_after == 0) {
2792 unsigned long duration =
2793 le32_to_cpu(h->duration_ms) * HZ / 1000;
2794
2795 di->lease_seq = seq;
2796 dentry->d_time = di->lease_renew_from + duration;
2797 di->lease_renew_after = di->lease_renew_from +
2798 (duration >> 1);
2799 di->lease_renew_from = 0;
2800 }
2801 break;
2802 }
2803 spin_unlock(&dentry->d_lock);
2804 dput(dentry);
2805
2806 if (!release)
2807 goto out;
2808
2809 release:
2810 /* let's just reuse the same message */
2811 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
2812 ceph_msg_get(msg);
2813 ceph_con_send(&session->s_con, msg);
2814
2815 out:
2816 iput(inode);
2817 mutex_unlock(&session->s_mutex);
2818 return;
2819
2820 bad:
2821 pr_err("corrupt lease message\n");
2822 ceph_msg_dump(msg);
2823 }
2824
2825 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2826 struct inode *inode,
2827 struct dentry *dentry, char action,
2828 u32 seq)
2829 {
2830 struct ceph_msg *msg;
2831 struct ceph_mds_lease *lease;
2832 int len = sizeof(*lease) + sizeof(u32);
2833 int dnamelen = 0;
2834
2835 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2836 inode, dentry, ceph_lease_op_name(action), session->s_mds);
2837 dnamelen = dentry->d_name.len;
2838 len += dnamelen;
2839
2840 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
2841 if (!msg)
2842 return;
2843 lease = msg->front.iov_base;
2844 lease->action = action;
2845 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
2846 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
2847 lease->seq = cpu_to_le32(seq);
2848 put_unaligned_le32(dnamelen, lease + 1);
2849 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
2850
2851 /*
2852 * if this is a preemptive lease RELEASE, no need to
2853 * flush request stream, since the actual request will
2854 * soon follow.
2855 */
2856 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
2857
2858 ceph_con_send(&session->s_con, msg);
2859 }
2860
2861 /*
2862 * Preemptively release a lease we expect to invalidate anyway.
2863 * Pass @inode always, @dentry is optional.
2864 */
2865 void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2866 struct dentry *dentry)
2867 {
2868 struct ceph_dentry_info *di;
2869 struct ceph_mds_session *session;
2870 u32 seq;
2871
2872 BUG_ON(inode == NULL);
2873 BUG_ON(dentry == NULL);
2874
2875 /* is dentry lease valid? */
2876 spin_lock(&dentry->d_lock);
2877 di = ceph_dentry(dentry);
2878 if (!di || !di->lease_session ||
2879 di->lease_session->s_mds < 0 ||
2880 di->lease_gen != di->lease_session->s_cap_gen ||
2881 !time_before(jiffies, dentry->d_time)) {
2882 dout("lease_release inode %p dentry %p -- "
2883 "no lease\n",
2884 inode, dentry);
2885 spin_unlock(&dentry->d_lock);
2886 return;
2887 }
2888
2889 /* we do have a lease on this dentry; note mds and seq */
2890 session = ceph_get_mds_session(di->lease_session);
2891 seq = di->lease_seq;
2892 __ceph_mdsc_drop_dentry_lease(dentry);
2893 spin_unlock(&dentry->d_lock);
2894
2895 dout("lease_release inode %p dentry %p to mds%d\n",
2896 inode, dentry, session->s_mds);
2897 ceph_mdsc_lease_send_msg(session, inode, dentry,
2898 CEPH_MDS_LEASE_RELEASE, seq);
2899 ceph_put_mds_session(session);
2900 }
2901
2902 /*
2903 * drop all leases (and dentry refs) in preparation for umount
2904 */
2905 static void drop_leases(struct ceph_mds_client *mdsc)
2906 {
2907 int i;
2908
2909 dout("drop_leases\n");
2910 mutex_lock(&mdsc->mutex);
2911 for (i = 0; i < mdsc->max_sessions; i++) {
2912 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2913 if (!s)
2914 continue;
2915 mutex_unlock(&mdsc->mutex);
2916 mutex_lock(&s->s_mutex);
2917 mutex_unlock(&s->s_mutex);
2918 ceph_put_mds_session(s);
2919 mutex_lock(&mdsc->mutex);
2920 }
2921 mutex_unlock(&mdsc->mutex);
2922 }
2923
2924
2925
2926 /*
2927 * delayed work -- periodically trim expired leases, renew caps with mds
2928 */
2929 static void schedule_delayed(struct ceph_mds_client *mdsc)
2930 {
2931 int delay = 5;
2932 unsigned hz = round_jiffies_relative(HZ * delay);
2933 schedule_delayed_work(&mdsc->delayed_work, hz);
2934 }
2935
2936 static void delayed_work(struct work_struct *work)
2937 {
2938 int i;
2939 struct ceph_mds_client *mdsc =
2940 container_of(work, struct ceph_mds_client, delayed_work.work);
2941 int renew_interval;
2942 int renew_caps;
2943
2944 dout("mdsc delayed_work\n");
2945 ceph_check_delayed_caps(mdsc);
2946
2947 mutex_lock(&mdsc->mutex);
2948 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
2949 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
2950 mdsc->last_renew_caps);
2951 if (renew_caps)
2952 mdsc->last_renew_caps = jiffies;
2953
2954 for (i = 0; i < mdsc->max_sessions; i++) {
2955 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2956 if (s == NULL)
2957 continue;
2958 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
2959 dout("resending session close request for mds%d\n",
2960 s->s_mds);
2961 request_close_session(mdsc, s);
2962 ceph_put_mds_session(s);
2963 continue;
2964 }
2965 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
2966 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
2967 s->s_state = CEPH_MDS_SESSION_HUNG;
2968 pr_info("mds%d hung\n", s->s_mds);
2969 }
2970 }
2971 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
2972 /* this mds is failed or recovering, just wait */
2973 ceph_put_mds_session(s);
2974 continue;
2975 }
2976 mutex_unlock(&mdsc->mutex);
2977
2978 mutex_lock(&s->s_mutex);
2979 if (renew_caps)
2980 send_renew_caps(mdsc, s);
2981 else
2982 ceph_con_keepalive(&s->s_con);
2983 ceph_add_cap_releases(mdsc, s);
2984 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2985 s->s_state == CEPH_MDS_SESSION_HUNG)
2986 ceph_send_cap_releases(mdsc, s);
2987 mutex_unlock(&s->s_mutex);
2988 ceph_put_mds_session(s);
2989
2990 mutex_lock(&mdsc->mutex);
2991 }
2992 mutex_unlock(&mdsc->mutex);
2993
2994 schedule_delayed(mdsc);
2995 }
2996
2997 int ceph_mdsc_init(struct ceph_fs_client *fsc)
2998
2999 {
3000 struct ceph_mds_client *mdsc;
3001
3002 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3003 if (!mdsc)
3004 return -ENOMEM;
3005 mdsc->fsc = fsc;
3006 fsc->mdsc = mdsc;
3007 mutex_init(&mdsc->mutex);
3008 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3009 if (mdsc->mdsmap == NULL)
3010 return -ENOMEM;
3011
3012 init_completion(&mdsc->safe_umount_waiters);
3013 init_waitqueue_head(&mdsc->session_close_wq);
3014 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3015 mdsc->sessions = NULL;
3016 mdsc->max_sessions = 0;
3017 mdsc->stopping = 0;
3018 init_rwsem(&mdsc->snap_rwsem);
3019 mdsc->snap_realms = RB_ROOT;
3020 INIT_LIST_HEAD(&mdsc->snap_empty);
3021 spin_lock_init(&mdsc->snap_empty_lock);
3022 mdsc->last_tid = 0;
3023 mdsc->request_tree = RB_ROOT;
3024 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3025 mdsc->last_renew_caps = jiffies;
3026 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3027 spin_lock_init(&mdsc->cap_delay_lock);
3028 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3029 spin_lock_init(&mdsc->snap_flush_lock);
3030 mdsc->cap_flush_seq = 0;
3031 INIT_LIST_HEAD(&mdsc->cap_dirty);
3032 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3033 mdsc->num_cap_flushing = 0;
3034 spin_lock_init(&mdsc->cap_dirty_lock);
3035 init_waitqueue_head(&mdsc->cap_flushing_wq);
3036 spin_lock_init(&mdsc->dentry_lru_lock);
3037 INIT_LIST_HEAD(&mdsc->dentry_lru);
3038
3039 ceph_caps_init(mdsc);
3040 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3041
3042 return 0;
3043 }
3044
3045 /*
3046 * Wait for safe replies on open mds requests. If we time out, drop
3047 * all requests from the tree to avoid dangling dentry refs.
3048 */
3049 static void wait_requests(struct ceph_mds_client *mdsc)
3050 {
3051 struct ceph_mds_request *req;
3052 struct ceph_fs_client *fsc = mdsc->fsc;
3053
3054 mutex_lock(&mdsc->mutex);
3055 if (__get_oldest_req(mdsc)) {
3056 mutex_unlock(&mdsc->mutex);
3057
3058 dout("wait_requests waiting for requests\n");
3059 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3060 fsc->client->options->mount_timeout * HZ);
3061
3062 /* tear down remaining requests */
3063 mutex_lock(&mdsc->mutex);
3064 while ((req = __get_oldest_req(mdsc))) {
3065 dout("wait_requests timed out on tid %llu\n",
3066 req->r_tid);
3067 __unregister_request(mdsc, req);
3068 }
3069 }
3070 mutex_unlock(&mdsc->mutex);
3071 dout("wait_requests done\n");
3072 }
3073
3074 /*
3075 * called before mount is ro, and before dentries are torn down.
3076 * (hmm, does this still race with new lookups?)
3077 */
3078 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3079 {
3080 dout("pre_umount\n");
3081 mdsc->stopping = 1;
3082
3083 drop_leases(mdsc);
3084 ceph_flush_dirty_caps(mdsc);
3085 wait_requests(mdsc);
3086
3087 /*
3088 * wait for reply handlers to drop their request refs and
3089 * their inode/dcache refs
3090 */
3091 ceph_msgr_flush();
3092 }
3093
3094 /*
3095 * wait for all write mds requests to flush.
3096 */
3097 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3098 {
3099 struct ceph_mds_request *req = NULL, *nextreq;
3100 struct rb_node *n;
3101
3102 mutex_lock(&mdsc->mutex);
3103 dout("wait_unsafe_requests want %lld\n", want_tid);
3104 restart:
3105 req = __get_oldest_req(mdsc);
3106 while (req && req->r_tid <= want_tid) {
3107 /* find next request */
3108 n = rb_next(&req->r_node);
3109 if (n)
3110 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3111 else
3112 nextreq = NULL;
3113 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
3114 /* write op */
3115 ceph_mdsc_get_request(req);
3116 if (nextreq)
3117 ceph_mdsc_get_request(nextreq);
3118 mutex_unlock(&mdsc->mutex);
3119 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3120 req->r_tid, want_tid);
3121 wait_for_completion(&req->r_safe_completion);
3122 mutex_lock(&mdsc->mutex);
3123 ceph_mdsc_put_request(req);
3124 if (!nextreq)
3125 break; /* next dne before, so we're done! */
3126 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3127 /* next request was removed from tree */
3128 ceph_mdsc_put_request(nextreq);
3129 goto restart;
3130 }
3131 ceph_mdsc_put_request(nextreq); /* won't go away */
3132 }
3133 req = nextreq;
3134 }
3135 mutex_unlock(&mdsc->mutex);
3136 dout("wait_unsafe_requests done\n");
3137 }
3138
3139 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3140 {
3141 u64 want_tid, want_flush;
3142
3143 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3144 return;
3145
3146 dout("sync\n");
3147 mutex_lock(&mdsc->mutex);
3148 want_tid = mdsc->last_tid;
3149 want_flush = mdsc->cap_flush_seq;
3150 mutex_unlock(&mdsc->mutex);
3151 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
3152
3153 ceph_flush_dirty_caps(mdsc);
3154
3155 wait_unsafe_requests(mdsc, want_tid);
3156 wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
3157 }
3158
3159 /*
3160 * true if all sessions are closed, or we force unmount
3161 */
3162 static bool done_closing_sessions(struct ceph_mds_client *mdsc)
3163 {
3164 int i, n = 0;
3165
3166 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3167 return true;
3168
3169 mutex_lock(&mdsc->mutex);
3170 for (i = 0; i < mdsc->max_sessions; i++)
3171 if (mdsc->sessions[i])
3172 n++;
3173 mutex_unlock(&mdsc->mutex);
3174 return n == 0;
3175 }
3176
3177 /*
3178 * called after sb is ro.
3179 */
3180 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3181 {
3182 struct ceph_mds_session *session;
3183 int i;
3184 struct ceph_fs_client *fsc = mdsc->fsc;
3185 unsigned long timeout = fsc->client->options->mount_timeout * HZ;
3186
3187 dout("close_sessions\n");
3188
3189 /* close sessions */
3190 mutex_lock(&mdsc->mutex);
3191 for (i = 0; i < mdsc->max_sessions; i++) {
3192 session = __ceph_lookup_mds_session(mdsc, i);
3193 if (!session)
3194 continue;
3195 mutex_unlock(&mdsc->mutex);
3196 mutex_lock(&session->s_mutex);
3197 __close_session(mdsc, session);
3198 mutex_unlock(&session->s_mutex);
3199 ceph_put_mds_session(session);
3200 mutex_lock(&mdsc->mutex);
3201 }
3202 mutex_unlock(&mdsc->mutex);
3203
3204 dout("waiting for sessions to close\n");
3205 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3206 timeout);
3207
3208 /* tear down remaining sessions */
3209 mutex_lock(&mdsc->mutex);
3210 for (i = 0; i < mdsc->max_sessions; i++) {
3211 if (mdsc->sessions[i]) {
3212 session = get_session(mdsc->sessions[i]);
3213 __unregister_session(mdsc, session);
3214 mutex_unlock(&mdsc->mutex);
3215 mutex_lock(&session->s_mutex);
3216 remove_session_caps(session);
3217 mutex_unlock(&session->s_mutex);
3218 ceph_put_mds_session(session);
3219 mutex_lock(&mdsc->mutex);
3220 }
3221 }
3222 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3223 mutex_unlock(&mdsc->mutex);
3224
3225 ceph_cleanup_empty_realms(mdsc);
3226
3227 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3228
3229 dout("stopped\n");
3230 }
3231
3232 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3233 {
3234 dout("stop\n");
3235 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3236 if (mdsc->mdsmap)
3237 ceph_mdsmap_destroy(mdsc->mdsmap);
3238 kfree(mdsc->sessions);
3239 ceph_caps_finalize(mdsc);
3240 }
3241
3242 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3243 {
3244 struct ceph_mds_client *mdsc = fsc->mdsc;
3245
3246 dout("mdsc_destroy %p\n", mdsc);
3247 ceph_mdsc_stop(mdsc);
3248
3249 /* flush out any connection work with references to us */
3250 ceph_msgr_flush();
3251
3252 fsc->mdsc = NULL;
3253 kfree(mdsc);
3254 dout("mdsc_destroy %p done\n", mdsc);
3255 }
3256
3257
3258 /*
3259 * handle mds map update.
3260 */
3261 void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3262 {
3263 u32 epoch;
3264 u32 maplen;
3265 void *p = msg->front.iov_base;
3266 void *end = p + msg->front.iov_len;
3267 struct ceph_mdsmap *newmap, *oldmap;
3268 struct ceph_fsid fsid;
3269 int err = -EINVAL;
3270
3271 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3272 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3273 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3274 return;
3275 epoch = ceph_decode_32(&p);
3276 maplen = ceph_decode_32(&p);
3277 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3278
3279 /* do we need it? */
3280 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
3281 mutex_lock(&mdsc->mutex);
3282 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3283 dout("handle_map epoch %u <= our %u\n",
3284 epoch, mdsc->mdsmap->m_epoch);
3285 mutex_unlock(&mdsc->mutex);
3286 return;
3287 }
3288
3289 newmap = ceph_mdsmap_decode(&p, end);
3290 if (IS_ERR(newmap)) {
3291 err = PTR_ERR(newmap);
3292 goto bad_unlock;
3293 }
3294
3295 /* swap into place */
3296 if (mdsc->mdsmap) {
3297 oldmap = mdsc->mdsmap;
3298 mdsc->mdsmap = newmap;
3299 check_new_map(mdsc, newmap, oldmap);
3300 ceph_mdsmap_destroy(oldmap);
3301 } else {
3302 mdsc->mdsmap = newmap; /* first mds map */
3303 }
3304 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3305
3306 __wake_requests(mdsc, &mdsc->waiting_for_map);
3307
3308 mutex_unlock(&mdsc->mutex);
3309 schedule_delayed(mdsc);
3310 return;
3311
3312 bad_unlock:
3313 mutex_unlock(&mdsc->mutex);
3314 bad:
3315 pr_err("error decoding mdsmap %d\n", err);
3316 return;
3317 }
3318
3319 static struct ceph_connection *con_get(struct ceph_connection *con)
3320 {
3321 struct ceph_mds_session *s = con->private;
3322
3323 if (get_session(s)) {
3324 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3325 return con;
3326 }
3327 dout("mdsc con_get %p FAIL\n", s);
3328 return NULL;
3329 }
3330
3331 static void con_put(struct ceph_connection *con)
3332 {
3333 struct ceph_mds_session *s = con->private;
3334
3335 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
3336 ceph_put_mds_session(s);
3337 }
3338
3339 /*
3340 * if the client is unresponsive for long enough, the mds will kill
3341 * the session entirely.
3342 */
3343 static void peer_reset(struct ceph_connection *con)
3344 {
3345 struct ceph_mds_session *s = con->private;
3346 struct ceph_mds_client *mdsc = s->s_mdsc;
3347
3348 pr_warning("mds%d closed our session\n", s->s_mds);
3349 send_mds_reconnect(mdsc, s);
3350 }
3351
3352 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3353 {
3354 struct ceph_mds_session *s = con->private;
3355 struct ceph_mds_client *mdsc = s->s_mdsc;
3356 int type = le16_to_cpu(msg->hdr.type);
3357
3358 mutex_lock(&mdsc->mutex);
3359 if (__verify_registered_session(mdsc, s) < 0) {
3360 mutex_unlock(&mdsc->mutex);
3361 goto out;
3362 }
3363 mutex_unlock(&mdsc->mutex);
3364
3365 switch (type) {
3366 case CEPH_MSG_MDS_MAP:
3367 ceph_mdsc_handle_map(mdsc, msg);
3368 break;
3369 case CEPH_MSG_CLIENT_SESSION:
3370 handle_session(s, msg);
3371 break;
3372 case CEPH_MSG_CLIENT_REPLY:
3373 handle_reply(s, msg);
3374 break;
3375 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3376 handle_forward(mdsc, s, msg);
3377 break;
3378 case CEPH_MSG_CLIENT_CAPS:
3379 ceph_handle_caps(s, msg);
3380 break;
3381 case CEPH_MSG_CLIENT_SNAP:
3382 ceph_handle_snap(mdsc, s, msg);
3383 break;
3384 case CEPH_MSG_CLIENT_LEASE:
3385 handle_lease(mdsc, s, msg);
3386 break;
3387
3388 default:
3389 pr_err("received unknown message type %d %s\n", type,
3390 ceph_msg_type_name(type));
3391 }
3392 out:
3393 ceph_msg_put(msg);
3394 }
3395
3396 /*
3397 * authentication
3398 */
3399 static int get_authorizer(struct ceph_connection *con,
3400 void **buf, int *len, int *proto,
3401 void **reply_buf, int *reply_len, int force_new)
3402 {
3403 struct ceph_mds_session *s = con->private;
3404 struct ceph_mds_client *mdsc = s->s_mdsc;
3405 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3406 int ret = 0;
3407
3408 if (force_new && s->s_authorizer) {
3409 ac->ops->destroy_authorizer(ac, s->s_authorizer);
3410 s->s_authorizer = NULL;
3411 }
3412 if (s->s_authorizer == NULL) {
3413 if (ac->ops->create_authorizer) {
3414 ret = ac->ops->create_authorizer(
3415 ac, CEPH_ENTITY_TYPE_MDS,
3416 &s->s_authorizer,
3417 &s->s_authorizer_buf,
3418 &s->s_authorizer_buf_len,
3419 &s->s_authorizer_reply_buf,
3420 &s->s_authorizer_reply_buf_len);
3421 if (ret)
3422 return ret;
3423 }
3424 }
3425
3426 *proto = ac->protocol;
3427 *buf = s->s_authorizer_buf;
3428 *len = s->s_authorizer_buf_len;
3429 *reply_buf = s->s_authorizer_reply_buf;
3430 *reply_len = s->s_authorizer_reply_buf_len;
3431 return 0;
3432 }
3433
3434
3435 static int verify_authorizer_reply(struct ceph_connection *con, int len)
3436 {
3437 struct ceph_mds_session *s = con->private;
3438 struct ceph_mds_client *mdsc = s->s_mdsc;
3439 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3440
3441 return ac->ops->verify_authorizer_reply(ac, s->s_authorizer, len);
3442 }
3443
3444 static int invalidate_authorizer(struct ceph_connection *con)
3445 {
3446 struct ceph_mds_session *s = con->private;
3447 struct ceph_mds_client *mdsc = s->s_mdsc;
3448 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3449
3450 if (ac->ops->invalidate_authorizer)
3451 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3452
3453 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
3454 }
3455
3456 static const struct ceph_connection_operations mds_con_ops = {
3457 .get = con_get,
3458 .put = con_put,
3459 .dispatch = dispatch,
3460 .get_authorizer = get_authorizer,
3461 .verify_authorizer_reply = verify_authorizer_reply,
3462 .invalidate_authorizer = invalidate_authorizer,
3463 .peer_reset = peer_reset,
3464 };
3465
3466 /* eof */