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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / fs / ceph / mds_client.c
blob541ead4d89650543652141b68fe45e2e4713587f
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/gfp.h>
7 #include <linux/sched.h>
8 #include <linux/debugfs.h>
9 #include <linux/seq_file.h>
10 #include <linux/utsname.h>
11 #include <linux/ratelimit.h>
12
13 #include "super.h"
14 #include "mds_client.h"
15
16 #include <linux/ceph/ceph_features.h>
17 #include <linux/ceph/messenger.h>
18 #include <linux/ceph/decode.h>
19 #include <linux/ceph/pagelist.h>
20 #include <linux/ceph/auth.h>
21 #include <linux/ceph/debugfs.h>
22
23 /*
24 * A cluster of MDS (metadata server) daemons is responsible for
25 * managing the file system namespace (the directory hierarchy and
26 * inodes) and for coordinating shared access to storage. Metadata is
27 * partitioning hierarchically across a number of servers, and that
28 * partition varies over time as the cluster adjusts the distribution
29 * in order to balance load.
30 *
31 * The MDS client is primarily responsible to managing synchronous
32 * metadata requests for operations like open, unlink, and so forth.
33 * If there is a MDS failure, we find out about it when we (possibly
34 * request and) receive a new MDS map, and can resubmit affected
35 * requests.
36 *
37 * For the most part, though, we take advantage of a lossless
38 * communications channel to the MDS, and do not need to worry about
39 * timing out or resubmitting requests.
40 *
41 * We maintain a stateful "session" with each MDS we interact with.
42 * Within each session, we sent periodic heartbeat messages to ensure
43 * any capabilities or leases we have been issues remain valid. If
44 * the session times out and goes stale, our leases and capabilities
45 * are no longer valid.
46 */
47
48 struct ceph_reconnect_state {
49 int nr_caps;
50 struct ceph_pagelist *pagelist;
51 bool flock;
52 };
53
54 static void __wake_requests(struct ceph_mds_client *mdsc,
55 struct list_head *head);
56
57 static const struct ceph_connection_operations mds_con_ops;
58
59
60 /*
61 * mds reply parsing
62 */
63
64 /*
65 * parse individual inode info
66 */
67 static int parse_reply_info_in(void **p, void *end,
68 struct ceph_mds_reply_info_in *info,
69 u64 features)
70 {
71 int err = -EIO;
72
73 info->in = *p;
74 *p += sizeof(struct ceph_mds_reply_inode) +
75 sizeof(*info->in->fragtree.splits) *
76 le32_to_cpu(info->in->fragtree.nsplits);
77
78 ceph_decode_32_safe(p, end, info->symlink_len, bad);
79 ceph_decode_need(p, end, info->symlink_len, bad);
80 info->symlink = *p;
81 *p += info->symlink_len;
82
83 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
84 ceph_decode_copy_safe(p, end, &info->dir_layout,
85 sizeof(info->dir_layout), bad);
86 else
87 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
88
89 ceph_decode_32_safe(p, end, info->xattr_len, bad);
90 ceph_decode_need(p, end, info->xattr_len, bad);
91 info->xattr_data = *p;
92 *p += info->xattr_len;
93
94 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
95 ceph_decode_64_safe(p, end, info->inline_version, bad);
96 ceph_decode_32_safe(p, end, info->inline_len, bad);
97 ceph_decode_need(p, end, info->inline_len, bad);
98 info->inline_data = *p;
99 *p += info->inline_len;
100 } else
101 info->inline_version = CEPH_INLINE_NONE;
102
103 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
104 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
105 ceph_decode_need(p, end, info->pool_ns_len, bad);
106 *p += info->pool_ns_len;
107 } else {
108 info->pool_ns_len = 0;
109 }
110
111 return 0;
112 bad:
113 return err;
114 }
115
116 /*
117 * parse a normal reply, which may contain a (dir+)dentry and/or a
118 * target inode.
119 */
120 static int parse_reply_info_trace(void **p, void *end,
121 struct ceph_mds_reply_info_parsed *info,
122 u64 features)
123 {
124 int err;
125
126 if (info->head->is_dentry) {
127 err = parse_reply_info_in(p, end, &info->diri, features);
128 if (err < 0)
129 goto out_bad;
130
131 if (unlikely(*p + sizeof(*info->dirfrag) > end))
132 goto bad;
133 info->dirfrag = *p;
134 *p += sizeof(*info->dirfrag) +
135 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
136 if (unlikely(*p > end))
137 goto bad;
138
139 ceph_decode_32_safe(p, end, info->dname_len, bad);
140 ceph_decode_need(p, end, info->dname_len, bad);
141 info->dname = *p;
142 *p += info->dname_len;
143 info->dlease = *p;
144 *p += sizeof(*info->dlease);
145 }
146
147 if (info->head->is_target) {
148 err = parse_reply_info_in(p, end, &info->targeti, features);
149 if (err < 0)
150 goto out_bad;
151 }
152
153 if (unlikely(*p != end))
154 goto bad;
155 return 0;
156
157 bad:
158 err = -EIO;
159 out_bad:
160 pr_err("problem parsing mds trace %d\n", err);
161 return err;
162 }
163
164 /*
165 * parse readdir results
166 */
167 static int parse_reply_info_dir(void **p, void *end,
168 struct ceph_mds_reply_info_parsed *info,
169 u64 features)
170 {
171 u32 num, i = 0;
172 int err;
173
174 info->dir_dir = *p;
175 if (*p + sizeof(*info->dir_dir) > end)
176 goto bad;
177 *p += sizeof(*info->dir_dir) +
178 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
179 if (*p > end)
180 goto bad;
181
182 ceph_decode_need(p, end, sizeof(num) + 2, bad);
183 num = ceph_decode_32(p);
184 info->dir_end = ceph_decode_8(p);
185 info->dir_complete = ceph_decode_8(p);
186 if (num == 0)
187 goto done;
188
189 BUG_ON(!info->dir_in);
190 info->dir_dname = (void *)(info->dir_in + num);
191 info->dir_dname_len = (void *)(info->dir_dname + num);
192 info->dir_dlease = (void *)(info->dir_dname_len + num);
193 if ((unsigned long)(info->dir_dlease + num) >
194 (unsigned long)info->dir_in + info->dir_buf_size) {
195 pr_err("dir contents are larger than expected\n");
196 WARN_ON(1);
197 goto bad;
198 }
199
200 info->dir_nr = num;
201 while (num) {
202 /* dentry */
203 ceph_decode_need(p, end, sizeof(u32)*2, bad);
204 info->dir_dname_len[i] = ceph_decode_32(p);
205 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
206 info->dir_dname[i] = *p;
207 *p += info->dir_dname_len[i];
208 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
209 info->dir_dname[i]);
210 info->dir_dlease[i] = *p;
211 *p += sizeof(struct ceph_mds_reply_lease);
212
213 /* inode */
214 err = parse_reply_info_in(p, end, &info->dir_in[i], features);
215 if (err < 0)
216 goto out_bad;
217 i++;
218 num--;
219 }
220
221 done:
222 if (*p != end)
223 goto bad;
224 return 0;
225
226 bad:
227 err = -EIO;
228 out_bad:
229 pr_err("problem parsing dir contents %d\n", err);
230 return err;
231 }
232
233 /*
234 * parse fcntl F_GETLK results
235 */
236 static int parse_reply_info_filelock(void **p, void *end,
237 struct ceph_mds_reply_info_parsed *info,
238 u64 features)
239 {
240 if (*p + sizeof(*info->filelock_reply) > end)
241 goto bad;
242
243 info->filelock_reply = *p;
244 *p += sizeof(*info->filelock_reply);
245
246 if (unlikely(*p != end))
247 goto bad;
248 return 0;
249
250 bad:
251 return -EIO;
252 }
253
254 /*
255 * parse create results
256 */
257 static int parse_reply_info_create(void **p, void *end,
258 struct ceph_mds_reply_info_parsed *info,
259 u64 features)
260 {
261 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
262 if (*p == end) {
263 info->has_create_ino = false;
264 } else {
265 info->has_create_ino = true;
266 info->ino = ceph_decode_64(p);
267 }
268 }
269
270 if (unlikely(*p != end))
271 goto bad;
272 return 0;
273
274 bad:
275 return -EIO;
276 }
277
278 /*
279 * parse extra results
280 */
281 static int parse_reply_info_extra(void **p, void *end,
282 struct ceph_mds_reply_info_parsed *info,
283 u64 features)
284 {
285 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
286 return parse_reply_info_filelock(p, end, info, features);
287 else if (info->head->op == CEPH_MDS_OP_READDIR ||
288 info->head->op == CEPH_MDS_OP_LSSNAP)
289 return parse_reply_info_dir(p, end, info, features);
290 else if (info->head->op == CEPH_MDS_OP_CREATE)
291 return parse_reply_info_create(p, end, info, features);
292 else
293 return -EIO;
294 }
295
296 /*
297 * parse entire mds reply
298 */
299 static int parse_reply_info(struct ceph_msg *msg,
300 struct ceph_mds_reply_info_parsed *info,
301 u64 features)
302 {
303 void *p, *end;
304 u32 len;
305 int err;
306
307 info->head = msg->front.iov_base;
308 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
309 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
310
311 /* trace */
312 ceph_decode_32_safe(&p, end, len, bad);
313 if (len > 0) {
314 ceph_decode_need(&p, end, len, bad);
315 err = parse_reply_info_trace(&p, p+len, info, features);
316 if (err < 0)
317 goto out_bad;
318 }
319
320 /* extra */
321 ceph_decode_32_safe(&p, end, len, bad);
322 if (len > 0) {
323 ceph_decode_need(&p, end, len, bad);
324 err = parse_reply_info_extra(&p, p+len, info, features);
325 if (err < 0)
326 goto out_bad;
327 }
328
329 /* snap blob */
330 ceph_decode_32_safe(&p, end, len, bad);
331 info->snapblob_len = len;
332 info->snapblob = p;
333 p += len;
334
335 if (p != end)
336 goto bad;
337 return 0;
338
339 bad:
340 err = -EIO;
341 out_bad:
342 pr_err("mds parse_reply err %d\n", err);
343 return err;
344 }
345
346 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
347 {
348 if (!info->dir_in)
349 return;
350 free_pages((unsigned long)info->dir_in, get_order(info->dir_buf_size));
351 }
352
353
354 /*
355 * sessions
356 */
357 const char *ceph_session_state_name(int s)
358 {
359 switch (s) {
360 case CEPH_MDS_SESSION_NEW: return "new";
361 case CEPH_MDS_SESSION_OPENING: return "opening";
362 case CEPH_MDS_SESSION_OPEN: return "open";
363 case CEPH_MDS_SESSION_HUNG: return "hung";
364 case CEPH_MDS_SESSION_CLOSING: return "closing";
365 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
366 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
367 default: return "???";
368 }
369 }
370
371 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
372 {
373 if (atomic_inc_not_zero(&s->s_ref)) {
374 dout("mdsc get_session %p %d -> %d\n", s,
375 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
376 return s;
377 } else {
378 dout("mdsc get_session %p 0 -- FAIL", s);
379 return NULL;
380 }
381 }
382
383 void ceph_put_mds_session(struct ceph_mds_session *s)
384 {
385 dout("mdsc put_session %p %d -> %d\n", s,
386 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
387 if (atomic_dec_and_test(&s->s_ref)) {
388 if (s->s_auth.authorizer)
389 ceph_auth_destroy_authorizer(
390 s->s_mdsc->fsc->client->monc.auth,
391 s->s_auth.authorizer);
392 kfree(s);
393 }
394 }
395
396 /*
397 * called under mdsc->mutex
398 */
399 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
400 int mds)
401 {
402 struct ceph_mds_session *session;
403
404 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
405 return NULL;
406 session = mdsc->sessions[mds];
407 dout("lookup_mds_session %p %d\n", session,
408 atomic_read(&session->s_ref));
409 get_session(session);
410 return session;
411 }
412
413 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
414 {
415 if (mds >= mdsc->max_sessions)
416 return false;
417 return mdsc->sessions[mds];
418 }
419
420 static int __verify_registered_session(struct ceph_mds_client *mdsc,
421 struct ceph_mds_session *s)
422 {
423 if (s->s_mds >= mdsc->max_sessions ||
424 mdsc->sessions[s->s_mds] != s)
425 return -ENOENT;
426 return 0;
427 }
428
429 /*
430 * create+register a new session for given mds.
431 * called under mdsc->mutex.
432 */
433 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
434 int mds)
435 {
436 struct ceph_mds_session *s;
437
438 if (mds >= mdsc->mdsmap->m_max_mds)
439 return ERR_PTR(-EINVAL);
440
441 s = kzalloc(sizeof(*s), GFP_NOFS);
442 if (!s)
443 return ERR_PTR(-ENOMEM);
444 s->s_mdsc = mdsc;
445 s->s_mds = mds;
446 s->s_state = CEPH_MDS_SESSION_NEW;
447 s->s_ttl = 0;
448 s->s_seq = 0;
449 mutex_init(&s->s_mutex);
450
451 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
452
453 spin_lock_init(&s->s_gen_ttl_lock);
454 s->s_cap_gen = 0;
455 s->s_cap_ttl = jiffies - 1;
456
457 spin_lock_init(&s->s_cap_lock);
458 s->s_renew_requested = 0;
459 s->s_renew_seq = 0;
460 INIT_LIST_HEAD(&s->s_caps);
461 s->s_nr_caps = 0;
462 s->s_trim_caps = 0;
463 atomic_set(&s->s_ref, 1);
464 INIT_LIST_HEAD(&s->s_waiting);
465 INIT_LIST_HEAD(&s->s_unsafe);
466 s->s_num_cap_releases = 0;
467 s->s_cap_reconnect = 0;
468 s->s_cap_iterator = NULL;
469 INIT_LIST_HEAD(&s->s_cap_releases);
470 INIT_LIST_HEAD(&s->s_cap_flushing);
471 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
472
473 dout("register_session mds%d\n", mds);
474 if (mds >= mdsc->max_sessions) {
475 int newmax = 1 << get_count_order(mds+1);
476 struct ceph_mds_session **sa;
477
478 dout("register_session realloc to %d\n", newmax);
479 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
480 if (sa == NULL)
481 goto fail_realloc;
482 if (mdsc->sessions) {
483 memcpy(sa, mdsc->sessions,
484 mdsc->max_sessions * sizeof(void *));
485 kfree(mdsc->sessions);
486 }
487 mdsc->sessions = sa;
488 mdsc->max_sessions = newmax;
489 }
490 mdsc->sessions[mds] = s;
491 atomic_inc(&mdsc->num_sessions);
492 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
493
494 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
495 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
496
497 return s;
498
499 fail_realloc:
500 kfree(s);
501 return ERR_PTR(-ENOMEM);
502 }
503
504 /*
505 * called under mdsc->mutex
506 */
507 static void __unregister_session(struct ceph_mds_client *mdsc,
508 struct ceph_mds_session *s)
509 {
510 dout("__unregister_session mds%d %p\n", s->s_mds, s);
511 BUG_ON(mdsc->sessions[s->s_mds] != s);
512 mdsc->sessions[s->s_mds] = NULL;
513 ceph_con_close(&s->s_con);
514 ceph_put_mds_session(s);
515 atomic_dec(&mdsc->num_sessions);
516 }
517
518 /*
519 * drop session refs in request.
520 *
521 * should be last request ref, or hold mdsc->mutex
522 */
523 static void put_request_session(struct ceph_mds_request *req)
524 {
525 if (req->r_session) {
526 ceph_put_mds_session(req->r_session);
527 req->r_session = NULL;
528 }
529 }
530
531 void ceph_mdsc_release_request(struct kref *kref)
532 {
533 struct ceph_mds_request *req = container_of(kref,
534 struct ceph_mds_request,
535 r_kref);
536 destroy_reply_info(&req->r_reply_info);
537 if (req->r_request)
538 ceph_msg_put(req->r_request);
539 if (req->r_reply)
540 ceph_msg_put(req->r_reply);
541 if (req->r_inode) {
542 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
543 iput(req->r_inode);
544 }
545 if (req->r_locked_dir)
546 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
547 iput(req->r_target_inode);
548 if (req->r_dentry)
549 dput(req->r_dentry);
550 if (req->r_old_dentry)
551 dput(req->r_old_dentry);
552 if (req->r_old_dentry_dir) {
553 /*
554 * track (and drop pins for) r_old_dentry_dir
555 * separately, since r_old_dentry's d_parent may have
556 * changed between the dir mutex being dropped and
557 * this request being freed.
558 */
559 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
560 CEPH_CAP_PIN);
561 iput(req->r_old_dentry_dir);
562 }
563 kfree(req->r_path1);
564 kfree(req->r_path2);
565 if (req->r_pagelist)
566 ceph_pagelist_release(req->r_pagelist);
567 put_request_session(req);
568 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
569 kfree(req);
570 }
571
572 /*
573 * lookup session, bump ref if found.
574 *
575 * called under mdsc->mutex.
576 */
577 static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
578 u64 tid)
579 {
580 struct ceph_mds_request *req;
581 struct rb_node *n = mdsc->request_tree.rb_node;
582
583 while (n) {
584 req = rb_entry(n, struct ceph_mds_request, r_node);
585 if (tid < req->r_tid)
586 n = n->rb_left;
587 else if (tid > req->r_tid)
588 n = n->rb_right;
589 else {
590 ceph_mdsc_get_request(req);
591 return req;
592 }
593 }
594 return NULL;
595 }
596
597 static void __insert_request(struct ceph_mds_client *mdsc,
598 struct ceph_mds_request *new)
599 {
600 struct rb_node **p = &mdsc->request_tree.rb_node;
601 struct rb_node *parent = NULL;
602 struct ceph_mds_request *req = NULL;
603
604 while (*p) {
605 parent = *p;
606 req = rb_entry(parent, struct ceph_mds_request, r_node);
607 if (new->r_tid < req->r_tid)
608 p = &(*p)->rb_left;
609 else if (new->r_tid > req->r_tid)
610 p = &(*p)->rb_right;
611 else
612 BUG();
613 }
614
615 rb_link_node(&new->r_node, parent, p);
616 rb_insert_color(&new->r_node, &mdsc->request_tree);
617 }
618
619 /*
620 * Register an in-flight request, and assign a tid. Link to directory
621 * are modifying (if any).
622 *
623 * Called under mdsc->mutex.
624 */
625 static void __register_request(struct ceph_mds_client *mdsc,
626 struct ceph_mds_request *req,
627 struct inode *dir)
628 {
629 req->r_tid = ++mdsc->last_tid;
630 if (req->r_num_caps)
631 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
632 req->r_num_caps);
633 dout("__register_request %p tid %lld\n", req, req->r_tid);
634 ceph_mdsc_get_request(req);
635 __insert_request(mdsc, req);
636
637 req->r_uid = current_fsuid();
638 req->r_gid = current_fsgid();
639
640 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
641 mdsc->oldest_tid = req->r_tid;
642
643 if (dir) {
644 ihold(dir);
645 req->r_unsafe_dir = dir;
646 }
647 }
648
649 static void __unregister_request(struct ceph_mds_client *mdsc,
650 struct ceph_mds_request *req)
651 {
652 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
653
654 if (req->r_tid == mdsc->oldest_tid) {
655 struct rb_node *p = rb_next(&req->r_node);
656 mdsc->oldest_tid = 0;
657 while (p) {
658 struct ceph_mds_request *next_req =
659 rb_entry(p, struct ceph_mds_request, r_node);
660 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
661 mdsc->oldest_tid = next_req->r_tid;
662 break;
663 }
664 p = rb_next(p);
665 }
666 }
667
668 rb_erase(&req->r_node, &mdsc->request_tree);
669 RB_CLEAR_NODE(&req->r_node);
670
671 if (req->r_unsafe_dir && req->r_got_unsafe) {
672 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
673 spin_lock(&ci->i_unsafe_lock);
674 list_del_init(&req->r_unsafe_dir_item);
675 spin_unlock(&ci->i_unsafe_lock);
676 }
677 if (req->r_target_inode && req->r_got_unsafe) {
678 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
679 spin_lock(&ci->i_unsafe_lock);
680 list_del_init(&req->r_unsafe_target_item);
681 spin_unlock(&ci->i_unsafe_lock);
682 }
683
684 if (req->r_unsafe_dir) {
685 iput(req->r_unsafe_dir);
686 req->r_unsafe_dir = NULL;
687 }
688
689 complete_all(&req->r_safe_completion);
690
691 ceph_mdsc_put_request(req);
692 }
693
694 /*
695 * Choose mds to send request to next. If there is a hint set in the
696 * request (e.g., due to a prior forward hint from the mds), use that.
697 * Otherwise, consult frag tree and/or caps to identify the
698 * appropriate mds. If all else fails, choose randomly.
699 *
700 * Called under mdsc->mutex.
701 */
702 static struct dentry *get_nonsnap_parent(struct dentry *dentry)
703 {
704 /*
705 * we don't need to worry about protecting the d_parent access
706 * here because we never renaming inside the snapped namespace
707 * except to resplice to another snapdir, and either the old or new
708 * result is a valid result.
709 */
710 while (!IS_ROOT(dentry) && ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
711 dentry = dentry->d_parent;
712 return dentry;
713 }
714
715 static int __choose_mds(struct ceph_mds_client *mdsc,
716 struct ceph_mds_request *req)
717 {
718 struct inode *inode;
719 struct ceph_inode_info *ci;
720 struct ceph_cap *cap;
721 int mode = req->r_direct_mode;
722 int mds = -1;
723 u32 hash = req->r_direct_hash;
724 bool is_hash = req->r_direct_is_hash;
725
726 /*
727 * is there a specific mds we should try? ignore hint if we have
728 * no session and the mds is not up (active or recovering).
729 */
730 if (req->r_resend_mds >= 0 &&
731 (__have_session(mdsc, req->r_resend_mds) ||
732 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
733 dout("choose_mds using resend_mds mds%d\n",
734 req->r_resend_mds);
735 return req->r_resend_mds;
736 }
737
738 if (mode == USE_RANDOM_MDS)
739 goto random;
740
741 inode = NULL;
742 if (req->r_inode) {
743 inode = req->r_inode;
744 } else if (req->r_dentry) {
745 /* ignore race with rename; old or new d_parent is okay */
746 struct dentry *parent = req->r_dentry->d_parent;
747 struct inode *dir = d_inode(parent);
748
749 if (dir->i_sb != mdsc->fsc->sb) {
750 /* not this fs! */
751 inode = d_inode(req->r_dentry);
752 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
753 /* direct snapped/virtual snapdir requests
754 * based on parent dir inode */
755 struct dentry *dn = get_nonsnap_parent(parent);
756 inode = d_inode(dn);
757 dout("__choose_mds using nonsnap parent %p\n", inode);
758 } else {
759 /* dentry target */
760 inode = d_inode(req->r_dentry);
761 if (!inode || mode == USE_AUTH_MDS) {
762 /* dir + name */
763 inode = dir;
764 hash = ceph_dentry_hash(dir, req->r_dentry);
765 is_hash = true;
766 }
767 }
768 }
769
770 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
771 (int)hash, mode);
772 if (!inode)
773 goto random;
774 ci = ceph_inode(inode);
775
776 if (is_hash && S_ISDIR(inode->i_mode)) {
777 struct ceph_inode_frag frag;
778 int found;
779
780 ceph_choose_frag(ci, hash, &frag, &found);
781 if (found) {
782 if (mode == USE_ANY_MDS && frag.ndist > 0) {
783 u8 r;
784
785 /* choose a random replica */
786 get_random_bytes(&r, 1);
787 r %= frag.ndist;
788 mds = frag.dist[r];
789 dout("choose_mds %p %llx.%llx "
790 "frag %u mds%d (%d/%d)\n",
791 inode, ceph_vinop(inode),
792 frag.frag, mds,
793 (int)r, frag.ndist);
794 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
795 CEPH_MDS_STATE_ACTIVE)
796 return mds;
797 }
798
799 /* since this file/dir wasn't known to be
800 * replicated, then we want to look for the
801 * authoritative mds. */
802 mode = USE_AUTH_MDS;
803 if (frag.mds >= 0) {
804 /* choose auth mds */
805 mds = frag.mds;
806 dout("choose_mds %p %llx.%llx "
807 "frag %u mds%d (auth)\n",
808 inode, ceph_vinop(inode), frag.frag, mds);
809 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
810 CEPH_MDS_STATE_ACTIVE)
811 return mds;
812 }
813 }
814 }
815
816 spin_lock(&ci->i_ceph_lock);
817 cap = NULL;
818 if (mode == USE_AUTH_MDS)
819 cap = ci->i_auth_cap;
820 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
821 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
822 if (!cap) {
823 spin_unlock(&ci->i_ceph_lock);
824 goto random;
825 }
826 mds = cap->session->s_mds;
827 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
828 inode, ceph_vinop(inode), mds,
829 cap == ci->i_auth_cap ? "auth " : "", cap);
830 spin_unlock(&ci->i_ceph_lock);
831 return mds;
832
833 random:
834 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
835 dout("choose_mds chose random mds%d\n", mds);
836 return mds;
837 }
838
839
840 /*
841 * session messages
842 */
843 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
844 {
845 struct ceph_msg *msg;
846 struct ceph_mds_session_head *h;
847
848 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
849 false);
850 if (!msg) {
851 pr_err("create_session_msg ENOMEM creating msg\n");
852 return NULL;
853 }
854 h = msg->front.iov_base;
855 h->op = cpu_to_le32(op);
856 h->seq = cpu_to_le64(seq);
857
858 return msg;
859 }
860
861 /*
862 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
863 * to include additional client metadata fields.
864 */
865 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
866 {
867 struct ceph_msg *msg;
868 struct ceph_mds_session_head *h;
869 int i = -1;
870 int metadata_bytes = 0;
871 int metadata_key_count = 0;
872 struct ceph_options *opt = mdsc->fsc->client->options;
873 void *p;
874
875 const char* metadata[][2] = {
876 {"hostname", utsname()->nodename},
877 {"kernel_version", utsname()->release},
878 {"entity_id", opt->name ? opt->name : ""},
879 {NULL, NULL}
880 };
881
882 /* Calculate serialized length of metadata */
883 metadata_bytes = 4; /* map length */
884 for (i = 0; metadata[i][0] != NULL; ++i) {
885 metadata_bytes += 8 + strlen(metadata[i][0]) +
886 strlen(metadata[i][1]);
887 metadata_key_count++;
888 }
889
890 /* Allocate the message */
891 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
892 GFP_NOFS, false);
893 if (!msg) {
894 pr_err("create_session_msg ENOMEM creating msg\n");
895 return NULL;
896 }
897 h = msg->front.iov_base;
898 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
899 h->seq = cpu_to_le64(seq);
900
901 /*
902 * Serialize client metadata into waiting buffer space, using
903 * the format that userspace expects for map<string, string>
904 *
905 * ClientSession messages with metadata are v2
906 */
907 msg->hdr.version = cpu_to_le16(2);
908 msg->hdr.compat_version = cpu_to_le16(1);
909
910 /* The write pointer, following the session_head structure */
911 p = msg->front.iov_base + sizeof(*h);
912
913 /* Number of entries in the map */
914 ceph_encode_32(&p, metadata_key_count);
915
916 /* Two length-prefixed strings for each entry in the map */
917 for (i = 0; metadata[i][0] != NULL; ++i) {
918 size_t const key_len = strlen(metadata[i][0]);
919 size_t const val_len = strlen(metadata[i][1]);
920
921 ceph_encode_32(&p, key_len);
922 memcpy(p, metadata[i][0], key_len);
923 p += key_len;
924 ceph_encode_32(&p, val_len);
925 memcpy(p, metadata[i][1], val_len);
926 p += val_len;
927 }
928
929 return msg;
930 }
931
932 /*
933 * send session open request.
934 *
935 * called under mdsc->mutex
936 */
937 static int __open_session(struct ceph_mds_client *mdsc,
938 struct ceph_mds_session *session)
939 {
940 struct ceph_msg *msg;
941 int mstate;
942 int mds = session->s_mds;
943
944 /* wait for mds to go active? */
945 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
946 dout("open_session to mds%d (%s)\n", mds,
947 ceph_mds_state_name(mstate));
948 session->s_state = CEPH_MDS_SESSION_OPENING;
949 session->s_renew_requested = jiffies;
950
951 /* send connect message */
952 msg = create_session_open_msg(mdsc, session->s_seq);
953 if (!msg)
954 return -ENOMEM;
955 ceph_con_send(&session->s_con, msg);
956 return 0;
957 }
958
959 /*
960 * open sessions for any export targets for the given mds
961 *
962 * called under mdsc->mutex
963 */
964 static struct ceph_mds_session *
965 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
966 {
967 struct ceph_mds_session *session;
968
969 session = __ceph_lookup_mds_session(mdsc, target);
970 if (!session) {
971 session = register_session(mdsc, target);
972 if (IS_ERR(session))
973 return session;
974 }
975 if (session->s_state == CEPH_MDS_SESSION_NEW ||
976 session->s_state == CEPH_MDS_SESSION_CLOSING)
977 __open_session(mdsc, session);
978
979 return session;
980 }
981
982 struct ceph_mds_session *
983 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
984 {
985 struct ceph_mds_session *session;
986
987 dout("open_export_target_session to mds%d\n", target);
988
989 mutex_lock(&mdsc->mutex);
990 session = __open_export_target_session(mdsc, target);
991 mutex_unlock(&mdsc->mutex);
992
993 return session;
994 }
995
996 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
997 struct ceph_mds_session *session)
998 {
999 struct ceph_mds_info *mi;
1000 struct ceph_mds_session *ts;
1001 int i, mds = session->s_mds;
1002
1003 if (mds >= mdsc->mdsmap->m_max_mds)
1004 return;
1005
1006 mi = &mdsc->mdsmap->m_info[mds];
1007 dout("open_export_target_sessions for mds%d (%d targets)\n",
1008 session->s_mds, mi->num_export_targets);
1009
1010 for (i = 0; i < mi->num_export_targets; i++) {
1011 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1012 if (!IS_ERR(ts))
1013 ceph_put_mds_session(ts);
1014 }
1015 }
1016
1017 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1018 struct ceph_mds_session *session)
1019 {
1020 mutex_lock(&mdsc->mutex);
1021 __open_export_target_sessions(mdsc, session);
1022 mutex_unlock(&mdsc->mutex);
1023 }
1024
1025 /*
1026 * session caps
1027 */
1028
1029 /* caller holds s_cap_lock, we drop it */
1030 static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
1031 struct ceph_mds_session *session)
1032 __releases(session->s_cap_lock)
1033 {
1034 LIST_HEAD(tmp_list);
1035 list_splice_init(&session->s_cap_releases, &tmp_list);
1036 session->s_num_cap_releases = 0;
1037 spin_unlock(&session->s_cap_lock);
1038
1039 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1040 while (!list_empty(&tmp_list)) {
1041 struct ceph_cap *cap;
1042 /* zero out the in-progress message */
1043 cap = list_first_entry(&tmp_list,
1044 struct ceph_cap, session_caps);
1045 list_del(&cap->session_caps);
1046 ceph_put_cap(mdsc, cap);
1047 }
1048 }
1049
1050 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1051 struct ceph_mds_session *session)
1052 {
1053 struct ceph_mds_request *req;
1054 struct rb_node *p;
1055
1056 dout("cleanup_session_requests mds%d\n", session->s_mds);
1057 mutex_lock(&mdsc->mutex);
1058 while (!list_empty(&session->s_unsafe)) {
1059 req = list_first_entry(&session->s_unsafe,
1060 struct ceph_mds_request, r_unsafe_item);
1061 list_del_init(&req->r_unsafe_item);
1062 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1063 req->r_tid);
1064 __unregister_request(mdsc, req);
1065 }
1066 /* zero r_attempts, so kick_requests() will re-send requests */
1067 p = rb_first(&mdsc->request_tree);
1068 while (p) {
1069 req = rb_entry(p, struct ceph_mds_request, r_node);
1070 p = rb_next(p);
1071 if (req->r_session &&
1072 req->r_session->s_mds == session->s_mds)
1073 req->r_attempts = 0;
1074 }
1075 mutex_unlock(&mdsc->mutex);
1076 }
1077
1078 /*
1079 * Helper to safely iterate over all caps associated with a session, with
1080 * special care taken to handle a racing __ceph_remove_cap().
1081 *
1082 * Caller must hold session s_mutex.
1083 */
1084 static int iterate_session_caps(struct ceph_mds_session *session,
1085 int (*cb)(struct inode *, struct ceph_cap *,
1086 void *), void *arg)
1087 {
1088 struct list_head *p;
1089 struct ceph_cap *cap;
1090 struct inode *inode, *last_inode = NULL;
1091 struct ceph_cap *old_cap = NULL;
1092 int ret;
1093
1094 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1095 spin_lock(&session->s_cap_lock);
1096 p = session->s_caps.next;
1097 while (p != &session->s_caps) {
1098 cap = list_entry(p, struct ceph_cap, session_caps);
1099 inode = igrab(&cap->ci->vfs_inode);
1100 if (!inode) {
1101 p = p->next;
1102 continue;
1103 }
1104 session->s_cap_iterator = cap;
1105 spin_unlock(&session->s_cap_lock);
1106
1107 if (last_inode) {
1108 iput(last_inode);
1109 last_inode = NULL;
1110 }
1111 if (old_cap) {
1112 ceph_put_cap(session->s_mdsc, old_cap);
1113 old_cap = NULL;
1114 }
1115
1116 ret = cb(inode, cap, arg);
1117 last_inode = inode;
1118
1119 spin_lock(&session->s_cap_lock);
1120 p = p->next;
1121 if (cap->ci == NULL) {
1122 dout("iterate_session_caps finishing cap %p removal\n",
1123 cap);
1124 BUG_ON(cap->session != session);
1125 cap->session = NULL;
1126 list_del_init(&cap->session_caps);
1127 session->s_nr_caps--;
1128 if (cap->queue_release) {
1129 list_add_tail(&cap->session_caps,
1130 &session->s_cap_releases);
1131 session->s_num_cap_releases++;
1132 } else {
1133 old_cap = cap; /* put_cap it w/o locks held */
1134 }
1135 }
1136 if (ret < 0)
1137 goto out;
1138 }
1139 ret = 0;
1140 out:
1141 session->s_cap_iterator = NULL;
1142 spin_unlock(&session->s_cap_lock);
1143
1144 iput(last_inode);
1145 if (old_cap)
1146 ceph_put_cap(session->s_mdsc, old_cap);
1147
1148 return ret;
1149 }
1150
1151 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1152 void *arg)
1153 {
1154 struct ceph_inode_info *ci = ceph_inode(inode);
1155 LIST_HEAD(to_remove);
1156 int drop = 0;
1157
1158 dout("removing cap %p, ci is %p, inode is %p\n",
1159 cap, ci, &ci->vfs_inode);
1160 spin_lock(&ci->i_ceph_lock);
1161 __ceph_remove_cap(cap, false);
1162 if (!ci->i_auth_cap) {
1163 struct ceph_cap_flush *cf;
1164 struct ceph_mds_client *mdsc =
1165 ceph_sb_to_client(inode->i_sb)->mdsc;
1166
1167 while (true) {
1168 struct rb_node *n = rb_first(&ci->i_cap_flush_tree);
1169 if (!n)
1170 break;
1171 cf = rb_entry(n, struct ceph_cap_flush, i_node);
1172 rb_erase(&cf->i_node, &ci->i_cap_flush_tree);
1173 list_add(&cf->list, &to_remove);
1174 }
1175
1176 spin_lock(&mdsc->cap_dirty_lock);
1177
1178 list_for_each_entry(cf, &to_remove, list)
1179 rb_erase(&cf->g_node, &mdsc->cap_flush_tree);
1180
1181 if (!list_empty(&ci->i_dirty_item)) {
1182 pr_warn_ratelimited(
1183 " dropping dirty %s state for %p %lld\n",
1184 ceph_cap_string(ci->i_dirty_caps),
1185 inode, ceph_ino(inode));
1186 ci->i_dirty_caps = 0;
1187 list_del_init(&ci->i_dirty_item);
1188 drop = 1;
1189 }
1190 if (!list_empty(&ci->i_flushing_item)) {
1191 pr_warn_ratelimited(
1192 " dropping dirty+flushing %s state for %p %lld\n",
1193 ceph_cap_string(ci->i_flushing_caps),
1194 inode, ceph_ino(inode));
1195 ci->i_flushing_caps = 0;
1196 list_del_init(&ci->i_flushing_item);
1197 mdsc->num_cap_flushing--;
1198 drop = 1;
1199 }
1200 spin_unlock(&mdsc->cap_dirty_lock);
1201
1202 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1203 list_add(&ci->i_prealloc_cap_flush->list, &to_remove);
1204 ci->i_prealloc_cap_flush = NULL;
1205 }
1206 }
1207 spin_unlock(&ci->i_ceph_lock);
1208 while (!list_empty(&to_remove)) {
1209 struct ceph_cap_flush *cf;
1210 cf = list_first_entry(&to_remove,
1211 struct ceph_cap_flush, list);
1212 list_del(&cf->list);
1213 ceph_free_cap_flush(cf);
1214 }
1215 while (drop--)
1216 iput(inode);
1217 return 0;
1218 }
1219
1220 /*
1221 * caller must hold session s_mutex
1222 */
1223 static void remove_session_caps(struct ceph_mds_session *session)
1224 {
1225 dout("remove_session_caps on %p\n", session);
1226 iterate_session_caps(session, remove_session_caps_cb, NULL);
1227
1228 spin_lock(&session->s_cap_lock);
1229 if (session->s_nr_caps > 0) {
1230 struct super_block *sb = session->s_mdsc->fsc->sb;
1231 struct inode *inode;
1232 struct ceph_cap *cap, *prev = NULL;
1233 struct ceph_vino vino;
1234 /*
1235 * iterate_session_caps() skips inodes that are being
1236 * deleted, we need to wait until deletions are complete.
1237 * __wait_on_freeing_inode() is designed for the job,
1238 * but it is not exported, so use lookup inode function
1239 * to access it.
1240 */
1241 while (!list_empty(&session->s_caps)) {
1242 cap = list_entry(session->s_caps.next,
1243 struct ceph_cap, session_caps);
1244 if (cap == prev)
1245 break;
1246 prev = cap;
1247 vino = cap->ci->i_vino;
1248 spin_unlock(&session->s_cap_lock);
1249
1250 inode = ceph_find_inode(sb, vino);
1251 iput(inode);
1252
1253 spin_lock(&session->s_cap_lock);
1254 }
1255 }
1256
1257 // drop cap expires and unlock s_cap_lock
1258 cleanup_cap_releases(session->s_mdsc, session);
1259
1260 BUG_ON(session->s_nr_caps > 0);
1261 BUG_ON(!list_empty(&session->s_cap_flushing));
1262 }
1263
1264 /*
1265 * wake up any threads waiting on this session's caps. if the cap is
1266 * old (didn't get renewed on the client reconnect), remove it now.
1267 *
1268 * caller must hold s_mutex.
1269 */
1270 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1271 void *arg)
1272 {
1273 struct ceph_inode_info *ci = ceph_inode(inode);
1274
1275 wake_up_all(&ci->i_cap_wq);
1276 if (arg) {
1277 spin_lock(&ci->i_ceph_lock);
1278 ci->i_wanted_max_size = 0;
1279 ci->i_requested_max_size = 0;
1280 spin_unlock(&ci->i_ceph_lock);
1281 }
1282 return 0;
1283 }
1284
1285 static void wake_up_session_caps(struct ceph_mds_session *session,
1286 int reconnect)
1287 {
1288 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1289 iterate_session_caps(session, wake_up_session_cb,
1290 (void *)(unsigned long)reconnect);
1291 }
1292
1293 /*
1294 * Send periodic message to MDS renewing all currently held caps. The
1295 * ack will reset the expiration for all caps from this session.
1296 *
1297 * caller holds s_mutex
1298 */
1299 static int send_renew_caps(struct ceph_mds_client *mdsc,
1300 struct ceph_mds_session *session)
1301 {
1302 struct ceph_msg *msg;
1303 int state;
1304
1305 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1306 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1307 pr_info("mds%d caps stale\n", session->s_mds);
1308 session->s_renew_requested = jiffies;
1309
1310 /* do not try to renew caps until a recovering mds has reconnected
1311 * with its clients. */
1312 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1313 if (state < CEPH_MDS_STATE_RECONNECT) {
1314 dout("send_renew_caps ignoring mds%d (%s)\n",
1315 session->s_mds, ceph_mds_state_name(state));
1316 return 0;
1317 }
1318
1319 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1320 ceph_mds_state_name(state));
1321 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1322 ++session->s_renew_seq);
1323 if (!msg)
1324 return -ENOMEM;
1325 ceph_con_send(&session->s_con, msg);
1326 return 0;
1327 }
1328
1329 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1330 struct ceph_mds_session *session, u64 seq)
1331 {
1332 struct ceph_msg *msg;
1333
1334 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1335 session->s_mds, ceph_session_state_name(session->s_state), seq);
1336 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1337 if (!msg)
1338 return -ENOMEM;
1339 ceph_con_send(&session->s_con, msg);
1340 return 0;
1341 }
1342
1343
1344 /*
1345 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1346 *
1347 * Called under session->s_mutex
1348 */
1349 static void renewed_caps(struct ceph_mds_client *mdsc,
1350 struct ceph_mds_session *session, int is_renew)
1351 {
1352 int was_stale;
1353 int wake = 0;
1354
1355 spin_lock(&session->s_cap_lock);
1356 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1357
1358 session->s_cap_ttl = session->s_renew_requested +
1359 mdsc->mdsmap->m_session_timeout*HZ;
1360
1361 if (was_stale) {
1362 if (time_before(jiffies, session->s_cap_ttl)) {
1363 pr_info("mds%d caps renewed\n", session->s_mds);
1364 wake = 1;
1365 } else {
1366 pr_info("mds%d caps still stale\n", session->s_mds);
1367 }
1368 }
1369 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1370 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1371 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1372 spin_unlock(&session->s_cap_lock);
1373
1374 if (wake)
1375 wake_up_session_caps(session, 0);
1376 }
1377
1378 /*
1379 * send a session close request
1380 */
1381 static int request_close_session(struct ceph_mds_client *mdsc,
1382 struct ceph_mds_session *session)
1383 {
1384 struct ceph_msg *msg;
1385
1386 dout("request_close_session mds%d state %s seq %lld\n",
1387 session->s_mds, ceph_session_state_name(session->s_state),
1388 session->s_seq);
1389 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1390 if (!msg)
1391 return -ENOMEM;
1392 ceph_con_send(&session->s_con, msg);
1393 return 0;
1394 }
1395
1396 /*
1397 * Called with s_mutex held.
1398 */
1399 static int __close_session(struct ceph_mds_client *mdsc,
1400 struct ceph_mds_session *session)
1401 {
1402 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1403 return 0;
1404 session->s_state = CEPH_MDS_SESSION_CLOSING;
1405 return request_close_session(mdsc, session);
1406 }
1407
1408 /*
1409 * Trim old(er) caps.
1410 *
1411 * Because we can't cache an inode without one or more caps, we do
1412 * this indirectly: if a cap is unused, we prune its aliases, at which
1413 * point the inode will hopefully get dropped to.
1414 *
1415 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1416 * memory pressure from the MDS, though, so it needn't be perfect.
1417 */
1418 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1419 {
1420 struct ceph_mds_session *session = arg;
1421 struct ceph_inode_info *ci = ceph_inode(inode);
1422 int used, wanted, oissued, mine;
1423
1424 if (session->s_trim_caps <= 0)
1425 return -1;
1426
1427 spin_lock(&ci->i_ceph_lock);
1428 mine = cap->issued | cap->implemented;
1429 used = __ceph_caps_used(ci);
1430 wanted = __ceph_caps_file_wanted(ci);
1431 oissued = __ceph_caps_issued_other(ci, cap);
1432
1433 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1434 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1435 ceph_cap_string(used), ceph_cap_string(wanted));
1436 if (cap == ci->i_auth_cap) {
1437 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1438 !list_empty(&ci->i_cap_snaps))
1439 goto out;
1440 if ((used | wanted) & CEPH_CAP_ANY_WR)
1441 goto out;
1442 }
1443 /* The inode has cached pages, but it's no longer used.
1444 * we can safely drop it */
1445 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1446 !(oissued & CEPH_CAP_FILE_CACHE)) {
1447 used = 0;
1448 oissued = 0;
1449 }
1450 if ((used | wanted) & ~oissued & mine)
1451 goto out; /* we need these caps */
1452
1453 session->s_trim_caps--;
1454 if (oissued) {
1455 /* we aren't the only cap.. just remove us */
1456 __ceph_remove_cap(cap, true);
1457 } else {
1458 /* try dropping referring dentries */
1459 spin_unlock(&ci->i_ceph_lock);
1460 d_prune_aliases(inode);
1461 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1462 inode, cap, atomic_read(&inode->i_count));
1463 return 0;
1464 }
1465
1466 out:
1467 spin_unlock(&ci->i_ceph_lock);
1468 return 0;
1469 }
1470
1471 /*
1472 * Trim session cap count down to some max number.
1473 */
1474 static int trim_caps(struct ceph_mds_client *mdsc,
1475 struct ceph_mds_session *session,
1476 int max_caps)
1477 {
1478 int trim_caps = session->s_nr_caps - max_caps;
1479
1480 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1481 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1482 if (trim_caps > 0) {
1483 session->s_trim_caps = trim_caps;
1484 iterate_session_caps(session, trim_caps_cb, session);
1485 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1486 session->s_mds, session->s_nr_caps, max_caps,
1487 trim_caps - session->s_trim_caps);
1488 session->s_trim_caps = 0;
1489 }
1490
1491 ceph_send_cap_releases(mdsc, session);
1492 return 0;
1493 }
1494
1495 static int check_capsnap_flush(struct ceph_inode_info *ci,
1496 u64 want_snap_seq)
1497 {
1498 int ret = 1;
1499 spin_lock(&ci->i_ceph_lock);
1500 if (want_snap_seq > 0 && !list_empty(&ci->i_cap_snaps)) {
1501 struct ceph_cap_snap *capsnap =
1502 list_first_entry(&ci->i_cap_snaps,
1503 struct ceph_cap_snap, ci_item);
1504 ret = capsnap->follows >= want_snap_seq;
1505 }
1506 spin_unlock(&ci->i_ceph_lock);
1507 return ret;
1508 }
1509
1510 static int check_caps_flush(struct ceph_mds_client *mdsc,
1511 u64 want_flush_tid)
1512 {
1513 struct rb_node *n;
1514 struct ceph_cap_flush *cf;
1515 int ret = 1;
1516
1517 spin_lock(&mdsc->cap_dirty_lock);
1518 n = rb_first(&mdsc->cap_flush_tree);
1519 cf = n ? rb_entry(n, struct ceph_cap_flush, g_node) : NULL;
1520 if (cf && cf->tid <= want_flush_tid) {
1521 dout("check_caps_flush still flushing tid %llu <= %llu\n",
1522 cf->tid, want_flush_tid);
1523 ret = 0;
1524 }
1525 spin_unlock(&mdsc->cap_dirty_lock);
1526 return ret;
1527 }
1528
1529 /*
1530 * flush all dirty inode data to disk.
1531 *
1532 * returns true if we've flushed through want_flush_tid
1533 */
1534 static void wait_caps_flush(struct ceph_mds_client *mdsc,
1535 u64 want_flush_tid, u64 want_snap_seq)
1536 {
1537 int mds;
1538
1539 dout("check_caps_flush want %llu snap want %llu\n",
1540 want_flush_tid, want_snap_seq);
1541 mutex_lock(&mdsc->mutex);
1542 for (mds = 0; mds < mdsc->max_sessions; ) {
1543 struct ceph_mds_session *session = mdsc->sessions[mds];
1544 struct inode *inode = NULL;
1545
1546 if (!session) {
1547 mds++;
1548 continue;
1549 }
1550 get_session(session);
1551 mutex_unlock(&mdsc->mutex);
1552
1553 mutex_lock(&session->s_mutex);
1554 if (!list_empty(&session->s_cap_snaps_flushing)) {
1555 struct ceph_cap_snap *capsnap =
1556 list_first_entry(&session->s_cap_snaps_flushing,
1557 struct ceph_cap_snap,
1558 flushing_item);
1559 struct ceph_inode_info *ci = capsnap->ci;
1560 if (!check_capsnap_flush(ci, want_snap_seq)) {
1561 dout("check_cap_flush still flushing snap %p "
1562 "follows %lld <= %lld to mds%d\n",
1563 &ci->vfs_inode, capsnap->follows,
1564 want_snap_seq, mds);
1565 inode = igrab(&ci->vfs_inode);
1566 }
1567 }
1568 mutex_unlock(&session->s_mutex);
1569 ceph_put_mds_session(session);
1570
1571 if (inode) {
1572 wait_event(mdsc->cap_flushing_wq,
1573 check_capsnap_flush(ceph_inode(inode),
1574 want_snap_seq));
1575 iput(inode);
1576 } else {
1577 mds++;
1578 }
1579
1580 mutex_lock(&mdsc->mutex);
1581 }
1582 mutex_unlock(&mdsc->mutex);
1583
1584 wait_event(mdsc->cap_flushing_wq,
1585 check_caps_flush(mdsc, want_flush_tid));
1586
1587 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
1588 }
1589
1590 /*
1591 * called under s_mutex
1592 */
1593 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1594 struct ceph_mds_session *session)
1595 {
1596 struct ceph_msg *msg = NULL;
1597 struct ceph_mds_cap_release *head;
1598 struct ceph_mds_cap_item *item;
1599 struct ceph_cap *cap;
1600 LIST_HEAD(tmp_list);
1601 int num_cap_releases;
1602
1603 spin_lock(&session->s_cap_lock);
1604 again:
1605 list_splice_init(&session->s_cap_releases, &tmp_list);
1606 num_cap_releases = session->s_num_cap_releases;
1607 session->s_num_cap_releases = 0;
1608 spin_unlock(&session->s_cap_lock);
1609
1610 while (!list_empty(&tmp_list)) {
1611 if (!msg) {
1612 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1613 PAGE_SIZE, GFP_NOFS, false);
1614 if (!msg)
1615 goto out_err;
1616 head = msg->front.iov_base;
1617 head->num = cpu_to_le32(0);
1618 msg->front.iov_len = sizeof(*head);
1619 }
1620 cap = list_first_entry(&tmp_list, struct ceph_cap,
1621 session_caps);
1622 list_del(&cap->session_caps);
1623 num_cap_releases--;
1624
1625 head = msg->front.iov_base;
1626 le32_add_cpu(&head->num, 1);
1627 item = msg->front.iov_base + msg->front.iov_len;
1628 item->ino = cpu_to_le64(cap->cap_ino);
1629 item->cap_id = cpu_to_le64(cap->cap_id);
1630 item->migrate_seq = cpu_to_le32(cap->mseq);
1631 item->seq = cpu_to_le32(cap->issue_seq);
1632 msg->front.iov_len += sizeof(*item);
1633
1634 ceph_put_cap(mdsc, cap);
1635
1636 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1637 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1638 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1639 ceph_con_send(&session->s_con, msg);
1640 msg = NULL;
1641 }
1642 }
1643
1644 BUG_ON(num_cap_releases != 0);
1645
1646 spin_lock(&session->s_cap_lock);
1647 if (!list_empty(&session->s_cap_releases))
1648 goto again;
1649 spin_unlock(&session->s_cap_lock);
1650
1651 if (msg) {
1652 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1653 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1654 ceph_con_send(&session->s_con, msg);
1655 }
1656 return;
1657 out_err:
1658 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1659 session->s_mds);
1660 spin_lock(&session->s_cap_lock);
1661 list_splice(&tmp_list, &session->s_cap_releases);
1662 session->s_num_cap_releases += num_cap_releases;
1663 spin_unlock(&session->s_cap_lock);
1664 }
1665
1666 /*
1667 * requests
1668 */
1669
1670 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1671 struct inode *dir)
1672 {
1673 struct ceph_inode_info *ci = ceph_inode(dir);
1674 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1675 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1676 size_t size = sizeof(*rinfo->dir_in) + sizeof(*rinfo->dir_dname_len) +
1677 sizeof(*rinfo->dir_dname) + sizeof(*rinfo->dir_dlease);
1678 int order, num_entries;
1679
1680 spin_lock(&ci->i_ceph_lock);
1681 num_entries = ci->i_files + ci->i_subdirs;
1682 spin_unlock(&ci->i_ceph_lock);
1683 num_entries = max(num_entries, 1);
1684 num_entries = min(num_entries, opt->max_readdir);
1685
1686 order = get_order(size * num_entries);
1687 while (order >= 0) {
1688 rinfo->dir_in = (void*)__get_free_pages(GFP_KERNEL |
1689 __GFP_NOWARN,
1690 order);
1691 if (rinfo->dir_in)
1692 break;
1693 order--;
1694 }
1695 if (!rinfo->dir_in)
1696 return -ENOMEM;
1697
1698 num_entries = (PAGE_SIZE << order) / size;
1699 num_entries = min(num_entries, opt->max_readdir);
1700
1701 rinfo->dir_buf_size = PAGE_SIZE << order;
1702 req->r_num_caps = num_entries + 1;
1703 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1704 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1705 return 0;
1706 }
1707
1708 /*
1709 * Create an mds request.
1710 */
1711 struct ceph_mds_request *
1712 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1713 {
1714 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1715
1716 if (!req)
1717 return ERR_PTR(-ENOMEM);
1718
1719 mutex_init(&req->r_fill_mutex);
1720 req->r_mdsc = mdsc;
1721 req->r_started = jiffies;
1722 req->r_resend_mds = -1;
1723 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1724 INIT_LIST_HEAD(&req->r_unsafe_target_item);
1725 req->r_fmode = -1;
1726 kref_init(&req->r_kref);
1727 INIT_LIST_HEAD(&req->r_wait);
1728 init_completion(&req->r_completion);
1729 init_completion(&req->r_safe_completion);
1730 INIT_LIST_HEAD(&req->r_unsafe_item);
1731
1732 req->r_stamp = current_fs_time(mdsc->fsc->sb);
1733
1734 req->r_op = op;
1735 req->r_direct_mode = mode;
1736 return req;
1737 }
1738
1739 /*
1740 * return oldest (lowest) request, tid in request tree, 0 if none.
1741 *
1742 * called under mdsc->mutex.
1743 */
1744 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1745 {
1746 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1747 return NULL;
1748 return rb_entry(rb_first(&mdsc->request_tree),
1749 struct ceph_mds_request, r_node);
1750 }
1751
1752 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1753 {
1754 return mdsc->oldest_tid;
1755 }
1756
1757 /*
1758 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1759 * on build_path_from_dentry in fs/cifs/dir.c.
1760 *
1761 * If @stop_on_nosnap, generate path relative to the first non-snapped
1762 * inode.
1763 *
1764 * Encode hidden .snap dirs as a double /, i.e.
1765 * foo/.snap/bar -> foo//bar
1766 */
1767 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1768 int stop_on_nosnap)
1769 {
1770 struct dentry *temp;
1771 char *path;
1772 int len, pos;
1773 unsigned seq;
1774
1775 if (dentry == NULL)
1776 return ERR_PTR(-EINVAL);
1777
1778 retry:
1779 len = 0;
1780 seq = read_seqbegin(&rename_lock);
1781 rcu_read_lock();
1782 for (temp = dentry; !IS_ROOT(temp);) {
1783 struct inode *inode = d_inode(temp);
1784 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1785 len++; /* slash only */
1786 else if (stop_on_nosnap && inode &&
1787 ceph_snap(inode) == CEPH_NOSNAP)
1788 break;
1789 else
1790 len += 1 + temp->d_name.len;
1791 temp = temp->d_parent;
1792 }
1793 rcu_read_unlock();
1794 if (len)
1795 len--; /* no leading '/' */
1796
1797 path = kmalloc(len+1, GFP_NOFS);
1798 if (path == NULL)
1799 return ERR_PTR(-ENOMEM);
1800 pos = len;
1801 path[pos] = 0; /* trailing null */
1802 rcu_read_lock();
1803 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1804 struct inode *inode;
1805
1806 spin_lock(&temp->d_lock);
1807 inode = d_inode(temp);
1808 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1809 dout("build_path path+%d: %p SNAPDIR\n",
1810 pos, temp);
1811 } else if (stop_on_nosnap && inode &&
1812 ceph_snap(inode) == CEPH_NOSNAP) {
1813 spin_unlock(&temp->d_lock);
1814 break;
1815 } else {
1816 pos -= temp->d_name.len;
1817 if (pos < 0) {
1818 spin_unlock(&temp->d_lock);
1819 break;
1820 }
1821 strncpy(path + pos, temp->d_name.name,
1822 temp->d_name.len);
1823 }
1824 spin_unlock(&temp->d_lock);
1825 if (pos)
1826 path[--pos] = '/';
1827 temp = temp->d_parent;
1828 }
1829 rcu_read_unlock();
1830 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1831 pr_err("build_path did not end path lookup where "
1832 "expected, namelen is %d, pos is %d\n", len, pos);
1833 /* presumably this is only possible if racing with a
1834 rename of one of the parent directories (we can not
1835 lock the dentries above us to prevent this, but
1836 retrying should be harmless) */
1837 kfree(path);
1838 goto retry;
1839 }
1840
1841 *base = ceph_ino(d_inode(temp));
1842 *plen = len;
1843 dout("build_path on %p %d built %llx '%.*s'\n",
1844 dentry, d_count(dentry), *base, len, path);
1845 return path;
1846 }
1847
1848 static int build_dentry_path(struct dentry *dentry,
1849 const char **ppath, int *ppathlen, u64 *pino,
1850 int *pfreepath)
1851 {
1852 char *path;
1853
1854 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) {
1855 *pino = ceph_ino(d_inode(dentry->d_parent));
1856 *ppath = dentry->d_name.name;
1857 *ppathlen = dentry->d_name.len;
1858 return 0;
1859 }
1860 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1861 if (IS_ERR(path))
1862 return PTR_ERR(path);
1863 *ppath = path;
1864 *pfreepath = 1;
1865 return 0;
1866 }
1867
1868 static int build_inode_path(struct inode *inode,
1869 const char **ppath, int *ppathlen, u64 *pino,
1870 int *pfreepath)
1871 {
1872 struct dentry *dentry;
1873 char *path;
1874
1875 if (ceph_snap(inode) == CEPH_NOSNAP) {
1876 *pino = ceph_ino(inode);
1877 *ppathlen = 0;
1878 return 0;
1879 }
1880 dentry = d_find_alias(inode);
1881 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1882 dput(dentry);
1883 if (IS_ERR(path))
1884 return PTR_ERR(path);
1885 *ppath = path;
1886 *pfreepath = 1;
1887 return 0;
1888 }
1889
1890 /*
1891 * request arguments may be specified via an inode *, a dentry *, or
1892 * an explicit ino+path.
1893 */
1894 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1895 const char *rpath, u64 rino,
1896 const char **ppath, int *pathlen,
1897 u64 *ino, int *freepath)
1898 {
1899 int r = 0;
1900
1901 if (rinode) {
1902 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1903 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1904 ceph_snap(rinode));
1905 } else if (rdentry) {
1906 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1907 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1908 *ppath);
1909 } else if (rpath || rino) {
1910 *ino = rino;
1911 *ppath = rpath;
1912 *pathlen = rpath ? strlen(rpath) : 0;
1913 dout(" path %.*s\n", *pathlen, rpath);
1914 }
1915
1916 return r;
1917 }
1918
1919 /*
1920 * called under mdsc->mutex
1921 */
1922 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1923 struct ceph_mds_request *req,
1924 int mds, bool drop_cap_releases)
1925 {
1926 struct ceph_msg *msg;
1927 struct ceph_mds_request_head *head;
1928 const char *path1 = NULL;
1929 const char *path2 = NULL;
1930 u64 ino1 = 0, ino2 = 0;
1931 int pathlen1 = 0, pathlen2 = 0;
1932 int freepath1 = 0, freepath2 = 0;
1933 int len;
1934 u16 releases;
1935 void *p, *end;
1936 int ret;
1937
1938 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1939 req->r_path1, req->r_ino1.ino,
1940 &path1, &pathlen1, &ino1, &freepath1);
1941 if (ret < 0) {
1942 msg = ERR_PTR(ret);
1943 goto out;
1944 }
1945
1946 ret = set_request_path_attr(NULL, req->r_old_dentry,
1947 req->r_path2, req->r_ino2.ino,
1948 &path2, &pathlen2, &ino2, &freepath2);
1949 if (ret < 0) {
1950 msg = ERR_PTR(ret);
1951 goto out_free1;
1952 }
1953
1954 len = sizeof(*head) +
1955 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
1956 sizeof(struct ceph_timespec);
1957
1958 /* calculate (max) length for cap releases */
1959 len += sizeof(struct ceph_mds_request_release) *
1960 (!!req->r_inode_drop + !!req->r_dentry_drop +
1961 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1962 if (req->r_dentry_drop)
1963 len += req->r_dentry->d_name.len;
1964 if (req->r_old_dentry_drop)
1965 len += req->r_old_dentry->d_name.len;
1966
1967 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1968 if (!msg) {
1969 msg = ERR_PTR(-ENOMEM);
1970 goto out_free2;
1971 }
1972
1973 msg->hdr.version = cpu_to_le16(2);
1974 msg->hdr.tid = cpu_to_le64(req->r_tid);
1975
1976 head = msg->front.iov_base;
1977 p = msg->front.iov_base + sizeof(*head);
1978 end = msg->front.iov_base + msg->front.iov_len;
1979
1980 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1981 head->op = cpu_to_le32(req->r_op);
1982 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1983 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
1984 head->args = req->r_args;
1985
1986 ceph_encode_filepath(&p, end, ino1, path1);
1987 ceph_encode_filepath(&p, end, ino2, path2);
1988
1989 /* make note of release offset, in case we need to replay */
1990 req->r_request_release_offset = p - msg->front.iov_base;
1991
1992 /* cap releases */
1993 releases = 0;
1994 if (req->r_inode_drop)
1995 releases += ceph_encode_inode_release(&p,
1996 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
1997 mds, req->r_inode_drop, req->r_inode_unless, 0);
1998 if (req->r_dentry_drop)
1999 releases += ceph_encode_dentry_release(&p, req->r_dentry,
2000 mds, req->r_dentry_drop, req->r_dentry_unless);
2001 if (req->r_old_dentry_drop)
2002 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
2003 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
2004 if (req->r_old_inode_drop)
2005 releases += ceph_encode_inode_release(&p,
2006 d_inode(req->r_old_dentry),
2007 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
2008
2009 if (drop_cap_releases) {
2010 releases = 0;
2011 p = msg->front.iov_base + req->r_request_release_offset;
2012 }
2013
2014 head->num_releases = cpu_to_le16(releases);
2015
2016 /* time stamp */
2017 {
2018 struct ceph_timespec ts;
2019 ceph_encode_timespec(&ts, &req->r_stamp);
2020 ceph_encode_copy(&p, &ts, sizeof(ts));
2021 }
2022
2023 BUG_ON(p > end);
2024 msg->front.iov_len = p - msg->front.iov_base;
2025 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2026
2027 if (req->r_pagelist) {
2028 struct ceph_pagelist *pagelist = req->r_pagelist;
2029 atomic_inc(&pagelist->refcnt);
2030 ceph_msg_data_add_pagelist(msg, pagelist);
2031 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2032 } else {
2033 msg->hdr.data_len = 0;
2034 }
2035
2036 msg->hdr.data_off = cpu_to_le16(0);
2037
2038 out_free2:
2039 if (freepath2)
2040 kfree((char *)path2);
2041 out_free1:
2042 if (freepath1)
2043 kfree((char *)path1);
2044 out:
2045 return msg;
2046 }
2047
2048 /*
2049 * called under mdsc->mutex if error, under no mutex if
2050 * success.
2051 */
2052 static void complete_request(struct ceph_mds_client *mdsc,
2053 struct ceph_mds_request *req)
2054 {
2055 if (req->r_callback)
2056 req->r_callback(mdsc, req);
2057 else
2058 complete_all(&req->r_completion);
2059 }
2060
2061 /*
2062 * called under mdsc->mutex
2063 */
2064 static int __prepare_send_request(struct ceph_mds_client *mdsc,
2065 struct ceph_mds_request *req,
2066 int mds, bool drop_cap_releases)
2067 {
2068 struct ceph_mds_request_head *rhead;
2069 struct ceph_msg *msg;
2070 int flags = 0;
2071
2072 req->r_attempts++;
2073 if (req->r_inode) {
2074 struct ceph_cap *cap =
2075 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2076
2077 if (cap)
2078 req->r_sent_on_mseq = cap->mseq;
2079 else
2080 req->r_sent_on_mseq = -1;
2081 }
2082 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2083 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2084
2085 if (req->r_got_unsafe) {
2086 void *p;
2087 /*
2088 * Replay. Do not regenerate message (and rebuild
2089 * paths, etc.); just use the original message.
2090 * Rebuilding paths will break for renames because
2091 * d_move mangles the src name.
2092 */
2093 msg = req->r_request;
2094 rhead = msg->front.iov_base;
2095
2096 flags = le32_to_cpu(rhead->flags);
2097 flags |= CEPH_MDS_FLAG_REPLAY;
2098 rhead->flags = cpu_to_le32(flags);
2099
2100 if (req->r_target_inode)
2101 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2102
2103 rhead->num_retry = req->r_attempts - 1;
2104
2105 /* remove cap/dentry releases from message */
2106 rhead->num_releases = 0;
2107
2108 /* time stamp */
2109 p = msg->front.iov_base + req->r_request_release_offset;
2110 {
2111 struct ceph_timespec ts;
2112 ceph_encode_timespec(&ts, &req->r_stamp);
2113 ceph_encode_copy(&p, &ts, sizeof(ts));
2114 }
2115
2116 msg->front.iov_len = p - msg->front.iov_base;
2117 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2118 return 0;
2119 }
2120
2121 if (req->r_request) {
2122 ceph_msg_put(req->r_request);
2123 req->r_request = NULL;
2124 }
2125 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2126 if (IS_ERR(msg)) {
2127 req->r_err = PTR_ERR(msg);
2128 return PTR_ERR(msg);
2129 }
2130 req->r_request = msg;
2131
2132 rhead = msg->front.iov_base;
2133 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2134 if (req->r_got_unsafe)
2135 flags |= CEPH_MDS_FLAG_REPLAY;
2136 if (req->r_locked_dir)
2137 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2138 rhead->flags = cpu_to_le32(flags);
2139 rhead->num_fwd = req->r_num_fwd;
2140 rhead->num_retry = req->r_attempts - 1;
2141 rhead->ino = 0;
2142
2143 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2144 return 0;
2145 }
2146
2147 /*
2148 * send request, or put it on the appropriate wait list.
2149 */
2150 static int __do_request(struct ceph_mds_client *mdsc,
2151 struct ceph_mds_request *req)
2152 {
2153 struct ceph_mds_session *session = NULL;
2154 int mds = -1;
2155 int err = 0;
2156
2157 if (req->r_err || req->r_got_result) {
2158 if (req->r_aborted)
2159 __unregister_request(mdsc, req);
2160 goto out;
2161 }
2162
2163 if (req->r_timeout &&
2164 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2165 dout("do_request timed out\n");
2166 err = -EIO;
2167 goto finish;
2168 }
2169 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2170 dout("do_request forced umount\n");
2171 err = -EIO;
2172 goto finish;
2173 }
2174
2175 put_request_session(req);
2176
2177 mds = __choose_mds(mdsc, req);
2178 if (mds < 0 ||
2179 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2180 dout("do_request no mds or not active, waiting for map\n");
2181 list_add(&req->r_wait, &mdsc->waiting_for_map);
2182 goto out;
2183 }
2184
2185 /* get, open session */
2186 session = __ceph_lookup_mds_session(mdsc, mds);
2187 if (!session) {
2188 session = register_session(mdsc, mds);
2189 if (IS_ERR(session)) {
2190 err = PTR_ERR(session);
2191 goto finish;
2192 }
2193 }
2194 req->r_session = get_session(session);
2195
2196 dout("do_request mds%d session %p state %s\n", mds, session,
2197 ceph_session_state_name(session->s_state));
2198 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2199 session->s_state != CEPH_MDS_SESSION_HUNG) {
2200 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2201 session->s_state == CEPH_MDS_SESSION_CLOSING)
2202 __open_session(mdsc, session);
2203 list_add(&req->r_wait, &session->s_waiting);
2204 goto out_session;
2205 }
2206
2207 /* send request */
2208 req->r_resend_mds = -1; /* forget any previous mds hint */
2209
2210 if (req->r_request_started == 0) /* note request start time */
2211 req->r_request_started = jiffies;
2212
2213 err = __prepare_send_request(mdsc, req, mds, false);
2214 if (!err) {
2215 ceph_msg_get(req->r_request);
2216 ceph_con_send(&session->s_con, req->r_request);
2217 }
2218
2219 out_session:
2220 ceph_put_mds_session(session);
2221 finish:
2222 if (err) {
2223 dout("__do_request early error %d\n", err);
2224 req->r_err = err;
2225 complete_request(mdsc, req);
2226 __unregister_request(mdsc, req);
2227 }
2228 out:
2229 return err;
2230 }
2231
2232 /*
2233 * called under mdsc->mutex
2234 */
2235 static void __wake_requests(struct ceph_mds_client *mdsc,
2236 struct list_head *head)
2237 {
2238 struct ceph_mds_request *req;
2239 LIST_HEAD(tmp_list);
2240
2241 list_splice_init(head, &tmp_list);
2242
2243 while (!list_empty(&tmp_list)) {
2244 req = list_entry(tmp_list.next,
2245 struct ceph_mds_request, r_wait);
2246 list_del_init(&req->r_wait);
2247 dout(" wake request %p tid %llu\n", req, req->r_tid);
2248 __do_request(mdsc, req);
2249 }
2250 }
2251
2252 /*
2253 * Wake up threads with requests pending for @mds, so that they can
2254 * resubmit their requests to a possibly different mds.
2255 */
2256 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2257 {
2258 struct ceph_mds_request *req;
2259 struct rb_node *p = rb_first(&mdsc->request_tree);
2260
2261 dout("kick_requests mds%d\n", mds);
2262 while (p) {
2263 req = rb_entry(p, struct ceph_mds_request, r_node);
2264 p = rb_next(p);
2265 if (req->r_got_unsafe)
2266 continue;
2267 if (req->r_attempts > 0)
2268 continue; /* only new requests */
2269 if (req->r_session &&
2270 req->r_session->s_mds == mds) {
2271 dout(" kicking tid %llu\n", req->r_tid);
2272 list_del_init(&req->r_wait);
2273 __do_request(mdsc, req);
2274 }
2275 }
2276 }
2277
2278 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2279 struct ceph_mds_request *req)
2280 {
2281 dout("submit_request on %p\n", req);
2282 mutex_lock(&mdsc->mutex);
2283 __register_request(mdsc, req, NULL);
2284 __do_request(mdsc, req);
2285 mutex_unlock(&mdsc->mutex);
2286 }
2287
2288 /*
2289 * Synchrously perform an mds request. Take care of all of the
2290 * session setup, forwarding, retry details.
2291 */
2292 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2293 struct inode *dir,
2294 struct ceph_mds_request *req)
2295 {
2296 int err;
2297
2298 dout("do_request on %p\n", req);
2299
2300 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2301 if (req->r_inode)
2302 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2303 if (req->r_locked_dir)
2304 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
2305 if (req->r_old_dentry_dir)
2306 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2307 CEPH_CAP_PIN);
2308
2309 /* deny access to directories with pool_ns layouts */
2310 if (req->r_inode && S_ISDIR(req->r_inode->i_mode) &&
2311 ceph_inode(req->r_inode)->i_pool_ns_len)
2312 return -EIO;
2313 if (req->r_locked_dir &&
2314 ceph_inode(req->r_locked_dir)->i_pool_ns_len)
2315 return -EIO;
2316
2317 /* issue */
2318 mutex_lock(&mdsc->mutex);
2319 __register_request(mdsc, req, dir);
2320 __do_request(mdsc, req);
2321
2322 if (req->r_err) {
2323 err = req->r_err;
2324 goto out;
2325 }
2326
2327 /* wait */
2328 mutex_unlock(&mdsc->mutex);
2329 dout("do_request waiting\n");
2330 if (!req->r_timeout && req->r_wait_for_completion) {
2331 err = req->r_wait_for_completion(mdsc, req);
2332 } else {
2333 long timeleft = wait_for_completion_killable_timeout(
2334 &req->r_completion,
2335 ceph_timeout_jiffies(req->r_timeout));
2336 if (timeleft > 0)
2337 err = 0;
2338 else if (!timeleft)
2339 err = -EIO; /* timed out */
2340 else
2341 err = timeleft; /* killed */
2342 }
2343 dout("do_request waited, got %d\n", err);
2344 mutex_lock(&mdsc->mutex);
2345
2346 /* only abort if we didn't race with a real reply */
2347 if (req->r_got_result) {
2348 err = le32_to_cpu(req->r_reply_info.head->result);
2349 } else if (err < 0) {
2350 dout("aborted request %lld with %d\n", req->r_tid, err);
2351
2352 /*
2353 * ensure we aren't running concurrently with
2354 * ceph_fill_trace or ceph_readdir_prepopulate, which
2355 * rely on locks (dir mutex) held by our caller.
2356 */
2357 mutex_lock(&req->r_fill_mutex);
2358 req->r_err = err;
2359 req->r_aborted = true;
2360 mutex_unlock(&req->r_fill_mutex);
2361
2362 if (req->r_locked_dir &&
2363 (req->r_op & CEPH_MDS_OP_WRITE))
2364 ceph_invalidate_dir_request(req);
2365 } else {
2366 err = req->r_err;
2367 }
2368
2369 out:
2370 mutex_unlock(&mdsc->mutex);
2371 dout("do_request %p done, result %d\n", req, err);
2372 return err;
2373 }
2374
2375 /*
2376 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2377 * namespace request.
2378 */
2379 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2380 {
2381 struct inode *inode = req->r_locked_dir;
2382
2383 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
2384
2385 ceph_dir_clear_complete(inode);
2386 if (req->r_dentry)
2387 ceph_invalidate_dentry_lease(req->r_dentry);
2388 if (req->r_old_dentry)
2389 ceph_invalidate_dentry_lease(req->r_old_dentry);
2390 }
2391
2392 /*
2393 * Handle mds reply.
2394 *
2395 * We take the session mutex and parse and process the reply immediately.
2396 * This preserves the logical ordering of replies, capabilities, etc., sent
2397 * by the MDS as they are applied to our local cache.
2398 */
2399 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2400 {
2401 struct ceph_mds_client *mdsc = session->s_mdsc;
2402 struct ceph_mds_request *req;
2403 struct ceph_mds_reply_head *head = msg->front.iov_base;
2404 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2405 struct ceph_snap_realm *realm;
2406 u64 tid;
2407 int err, result;
2408 int mds = session->s_mds;
2409
2410 if (msg->front.iov_len < sizeof(*head)) {
2411 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2412 ceph_msg_dump(msg);
2413 return;
2414 }
2415
2416 /* get request, session */
2417 tid = le64_to_cpu(msg->hdr.tid);
2418 mutex_lock(&mdsc->mutex);
2419 req = __lookup_request(mdsc, tid);
2420 if (!req) {
2421 dout("handle_reply on unknown tid %llu\n", tid);
2422 mutex_unlock(&mdsc->mutex);
2423 return;
2424 }
2425 dout("handle_reply %p\n", req);
2426
2427 /* correct session? */
2428 if (req->r_session != session) {
2429 pr_err("mdsc_handle_reply got %llu on session mds%d"
2430 " not mds%d\n", tid, session->s_mds,
2431 req->r_session ? req->r_session->s_mds : -1);
2432 mutex_unlock(&mdsc->mutex);
2433 goto out;
2434 }
2435
2436 /* dup? */
2437 if ((req->r_got_unsafe && !head->safe) ||
2438 (req->r_got_safe && head->safe)) {
2439 pr_warn("got a dup %s reply on %llu from mds%d\n",
2440 head->safe ? "safe" : "unsafe", tid, mds);
2441 mutex_unlock(&mdsc->mutex);
2442 goto out;
2443 }
2444 if (req->r_got_safe) {
2445 pr_warn("got unsafe after safe on %llu from mds%d\n",
2446 tid, mds);
2447 mutex_unlock(&mdsc->mutex);
2448 goto out;
2449 }
2450
2451 result = le32_to_cpu(head->result);
2452
2453 /*
2454 * Handle an ESTALE
2455 * if we're not talking to the authority, send to them
2456 * if the authority has changed while we weren't looking,
2457 * send to new authority
2458 * Otherwise we just have to return an ESTALE
2459 */
2460 if (result == -ESTALE) {
2461 dout("got ESTALE on request %llu", req->r_tid);
2462 req->r_resend_mds = -1;
2463 if (req->r_direct_mode != USE_AUTH_MDS) {
2464 dout("not using auth, setting for that now");
2465 req->r_direct_mode = USE_AUTH_MDS;
2466 __do_request(mdsc, req);
2467 mutex_unlock(&mdsc->mutex);
2468 goto out;
2469 } else {
2470 int mds = __choose_mds(mdsc, req);
2471 if (mds >= 0 && mds != req->r_session->s_mds) {
2472 dout("but auth changed, so resending");
2473 __do_request(mdsc, req);
2474 mutex_unlock(&mdsc->mutex);
2475 goto out;
2476 }
2477 }
2478 dout("have to return ESTALE on request %llu", req->r_tid);
2479 }
2480
2481
2482 if (head->safe) {
2483 req->r_got_safe = true;
2484 __unregister_request(mdsc, req);
2485
2486 if (req->r_got_unsafe) {
2487 /*
2488 * We already handled the unsafe response, now do the
2489 * cleanup. No need to examine the response; the MDS
2490 * doesn't include any result info in the safe
2491 * response. And even if it did, there is nothing
2492 * useful we could do with a revised return value.
2493 */
2494 dout("got safe reply %llu, mds%d\n", tid, mds);
2495 list_del_init(&req->r_unsafe_item);
2496
2497 /* last unsafe request during umount? */
2498 if (mdsc->stopping && !__get_oldest_req(mdsc))
2499 complete_all(&mdsc->safe_umount_waiters);
2500 mutex_unlock(&mdsc->mutex);
2501 goto out;
2502 }
2503 } else {
2504 req->r_got_unsafe = true;
2505 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2506 if (req->r_unsafe_dir) {
2507 struct ceph_inode_info *ci =
2508 ceph_inode(req->r_unsafe_dir);
2509 spin_lock(&ci->i_unsafe_lock);
2510 list_add_tail(&req->r_unsafe_dir_item,
2511 &ci->i_unsafe_dirops);
2512 spin_unlock(&ci->i_unsafe_lock);
2513 }
2514 }
2515
2516 dout("handle_reply tid %lld result %d\n", tid, result);
2517 rinfo = &req->r_reply_info;
2518 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2519 mutex_unlock(&mdsc->mutex);
2520
2521 mutex_lock(&session->s_mutex);
2522 if (err < 0) {
2523 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2524 ceph_msg_dump(msg);
2525 goto out_err;
2526 }
2527
2528 /* snap trace */
2529 realm = NULL;
2530 if (rinfo->snapblob_len) {
2531 down_write(&mdsc->snap_rwsem);
2532 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2533 rinfo->snapblob + rinfo->snapblob_len,
2534 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2535 &realm);
2536 downgrade_write(&mdsc->snap_rwsem);
2537 } else {
2538 down_read(&mdsc->snap_rwsem);
2539 }
2540
2541 /* insert trace into our cache */
2542 mutex_lock(&req->r_fill_mutex);
2543 current->journal_info = req;
2544 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2545 if (err == 0) {
2546 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2547 req->r_op == CEPH_MDS_OP_LSSNAP))
2548 ceph_readdir_prepopulate(req, req->r_session);
2549 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2550 }
2551 current->journal_info = NULL;
2552 mutex_unlock(&req->r_fill_mutex);
2553
2554 up_read(&mdsc->snap_rwsem);
2555 if (realm)
2556 ceph_put_snap_realm(mdsc, realm);
2557
2558 if (err == 0 && req->r_got_unsafe && req->r_target_inode) {
2559 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2560 spin_lock(&ci->i_unsafe_lock);
2561 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2562 spin_unlock(&ci->i_unsafe_lock);
2563 }
2564 out_err:
2565 mutex_lock(&mdsc->mutex);
2566 if (!req->r_aborted) {
2567 if (err) {
2568 req->r_err = err;
2569 } else {
2570 req->r_reply = ceph_msg_get(msg);
2571 req->r_got_result = true;
2572 }
2573 } else {
2574 dout("reply arrived after request %lld was aborted\n", tid);
2575 }
2576 mutex_unlock(&mdsc->mutex);
2577
2578 mutex_unlock(&session->s_mutex);
2579
2580 /* kick calling process */
2581 complete_request(mdsc, req);
2582 out:
2583 ceph_mdsc_put_request(req);
2584 return;
2585 }
2586
2587
2588
2589 /*
2590 * handle mds notification that our request has been forwarded.
2591 */
2592 static void handle_forward(struct ceph_mds_client *mdsc,
2593 struct ceph_mds_session *session,
2594 struct ceph_msg *msg)
2595 {
2596 struct ceph_mds_request *req;
2597 u64 tid = le64_to_cpu(msg->hdr.tid);
2598 u32 next_mds;
2599 u32 fwd_seq;
2600 int err = -EINVAL;
2601 void *p = msg->front.iov_base;
2602 void *end = p + msg->front.iov_len;
2603
2604 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2605 next_mds = ceph_decode_32(&p);
2606 fwd_seq = ceph_decode_32(&p);
2607
2608 mutex_lock(&mdsc->mutex);
2609 req = __lookup_request(mdsc, tid);
2610 if (!req) {
2611 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2612 goto out; /* dup reply? */
2613 }
2614
2615 if (req->r_aborted) {
2616 dout("forward tid %llu aborted, unregistering\n", tid);
2617 __unregister_request(mdsc, req);
2618 } else if (fwd_seq <= req->r_num_fwd) {
2619 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2620 tid, next_mds, req->r_num_fwd, fwd_seq);
2621 } else {
2622 /* resend. forward race not possible; mds would drop */
2623 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2624 BUG_ON(req->r_err);
2625 BUG_ON(req->r_got_result);
2626 req->r_attempts = 0;
2627 req->r_num_fwd = fwd_seq;
2628 req->r_resend_mds = next_mds;
2629 put_request_session(req);
2630 __do_request(mdsc, req);
2631 }
2632 ceph_mdsc_put_request(req);
2633 out:
2634 mutex_unlock(&mdsc->mutex);
2635 return;
2636
2637 bad:
2638 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2639 }
2640
2641 /*
2642 * handle a mds session control message
2643 */
2644 static void handle_session(struct ceph_mds_session *session,
2645 struct ceph_msg *msg)
2646 {
2647 struct ceph_mds_client *mdsc = session->s_mdsc;
2648 u32 op;
2649 u64 seq;
2650 int mds = session->s_mds;
2651 struct ceph_mds_session_head *h = msg->front.iov_base;
2652 int wake = 0;
2653
2654 /* decode */
2655 if (msg->front.iov_len != sizeof(*h))
2656 goto bad;
2657 op = le32_to_cpu(h->op);
2658 seq = le64_to_cpu(h->seq);
2659
2660 mutex_lock(&mdsc->mutex);
2661 if (op == CEPH_SESSION_CLOSE)
2662 __unregister_session(mdsc, session);
2663 /* FIXME: this ttl calculation is generous */
2664 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2665 mutex_unlock(&mdsc->mutex);
2666
2667 mutex_lock(&session->s_mutex);
2668
2669 dout("handle_session mds%d %s %p state %s seq %llu\n",
2670 mds, ceph_session_op_name(op), session,
2671 ceph_session_state_name(session->s_state), seq);
2672
2673 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2674 session->s_state = CEPH_MDS_SESSION_OPEN;
2675 pr_info("mds%d came back\n", session->s_mds);
2676 }
2677
2678 switch (op) {
2679 case CEPH_SESSION_OPEN:
2680 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2681 pr_info("mds%d reconnect success\n", session->s_mds);
2682 session->s_state = CEPH_MDS_SESSION_OPEN;
2683 renewed_caps(mdsc, session, 0);
2684 wake = 1;
2685 if (mdsc->stopping)
2686 __close_session(mdsc, session);
2687 break;
2688
2689 case CEPH_SESSION_RENEWCAPS:
2690 if (session->s_renew_seq == seq)
2691 renewed_caps(mdsc, session, 1);
2692 break;
2693
2694 case CEPH_SESSION_CLOSE:
2695 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2696 pr_info("mds%d reconnect denied\n", session->s_mds);
2697 cleanup_session_requests(mdsc, session);
2698 remove_session_caps(session);
2699 wake = 2; /* for good measure */
2700 wake_up_all(&mdsc->session_close_wq);
2701 break;
2702
2703 case CEPH_SESSION_STALE:
2704 pr_info("mds%d caps went stale, renewing\n",
2705 session->s_mds);
2706 spin_lock(&session->s_gen_ttl_lock);
2707 session->s_cap_gen++;
2708 session->s_cap_ttl = jiffies - 1;
2709 spin_unlock(&session->s_gen_ttl_lock);
2710 send_renew_caps(mdsc, session);
2711 break;
2712
2713 case CEPH_SESSION_RECALL_STATE:
2714 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2715 break;
2716
2717 case CEPH_SESSION_FLUSHMSG:
2718 send_flushmsg_ack(mdsc, session, seq);
2719 break;
2720
2721 case CEPH_SESSION_FORCE_RO:
2722 dout("force_session_readonly %p\n", session);
2723 spin_lock(&session->s_cap_lock);
2724 session->s_readonly = true;
2725 spin_unlock(&session->s_cap_lock);
2726 wake_up_session_caps(session, 0);
2727 break;
2728
2729 default:
2730 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2731 WARN_ON(1);
2732 }
2733
2734 mutex_unlock(&session->s_mutex);
2735 if (wake) {
2736 mutex_lock(&mdsc->mutex);
2737 __wake_requests(mdsc, &session->s_waiting);
2738 if (wake == 2)
2739 kick_requests(mdsc, mds);
2740 mutex_unlock(&mdsc->mutex);
2741 }
2742 return;
2743
2744 bad:
2745 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2746 (int)msg->front.iov_len);
2747 ceph_msg_dump(msg);
2748 return;
2749 }
2750
2751
2752 /*
2753 * called under session->mutex.
2754 */
2755 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2756 struct ceph_mds_session *session)
2757 {
2758 struct ceph_mds_request *req, *nreq;
2759 struct rb_node *p;
2760 int err;
2761
2762 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2763
2764 mutex_lock(&mdsc->mutex);
2765 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2766 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2767 if (!err) {
2768 ceph_msg_get(req->r_request);
2769 ceph_con_send(&session->s_con, req->r_request);
2770 }
2771 }
2772
2773 /*
2774 * also re-send old requests when MDS enters reconnect stage. So that MDS
2775 * can process completed request in clientreplay stage.
2776 */
2777 p = rb_first(&mdsc->request_tree);
2778 while (p) {
2779 req = rb_entry(p, struct ceph_mds_request, r_node);
2780 p = rb_next(p);
2781 if (req->r_got_unsafe)
2782 continue;
2783 if (req->r_attempts == 0)
2784 continue; /* only old requests */
2785 if (req->r_session &&
2786 req->r_session->s_mds == session->s_mds) {
2787 err = __prepare_send_request(mdsc, req,
2788 session->s_mds, true);
2789 if (!err) {
2790 ceph_msg_get(req->r_request);
2791 ceph_con_send(&session->s_con, req->r_request);
2792 }
2793 }
2794 }
2795 mutex_unlock(&mdsc->mutex);
2796 }
2797
2798 /*
2799 * Encode information about a cap for a reconnect with the MDS.
2800 */
2801 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2802 void *arg)
2803 {
2804 union {
2805 struct ceph_mds_cap_reconnect v2;
2806 struct ceph_mds_cap_reconnect_v1 v1;
2807 } rec;
2808 size_t reclen;
2809 struct ceph_inode_info *ci;
2810 struct ceph_reconnect_state *recon_state = arg;
2811 struct ceph_pagelist *pagelist = recon_state->pagelist;
2812 char *path;
2813 int pathlen, err;
2814 u64 pathbase;
2815 struct dentry *dentry;
2816
2817 ci = cap->ci;
2818
2819 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2820 inode, ceph_vinop(inode), cap, cap->cap_id,
2821 ceph_cap_string(cap->issued));
2822 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2823 if (err)
2824 return err;
2825
2826 dentry = d_find_alias(inode);
2827 if (dentry) {
2828 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2829 if (IS_ERR(path)) {
2830 err = PTR_ERR(path);
2831 goto out_dput;
2832 }
2833 } else {
2834 path = NULL;
2835 pathlen = 0;
2836 }
2837 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2838 if (err)
2839 goto out_free;
2840
2841 spin_lock(&ci->i_ceph_lock);
2842 cap->seq = 0; /* reset cap seq */
2843 cap->issue_seq = 0; /* and issue_seq */
2844 cap->mseq = 0; /* and migrate_seq */
2845 cap->cap_gen = cap->session->s_cap_gen;
2846
2847 if (recon_state->flock) {
2848 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2849 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2850 rec.v2.issued = cpu_to_le32(cap->issued);
2851 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2852 rec.v2.pathbase = cpu_to_le64(pathbase);
2853 rec.v2.flock_len = 0;
2854 reclen = sizeof(rec.v2);
2855 } else {
2856 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2857 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2858 rec.v1.issued = cpu_to_le32(cap->issued);
2859 rec.v1.size = cpu_to_le64(inode->i_size);
2860 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2861 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2862 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2863 rec.v1.pathbase = cpu_to_le64(pathbase);
2864 reclen = sizeof(rec.v1);
2865 }
2866 spin_unlock(&ci->i_ceph_lock);
2867
2868 if (recon_state->flock) {
2869 int num_fcntl_locks, num_flock_locks;
2870 struct ceph_filelock *flocks;
2871
2872 encode_again:
2873 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
2874 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2875 sizeof(struct ceph_filelock), GFP_NOFS);
2876 if (!flocks) {
2877 err = -ENOMEM;
2878 goto out_free;
2879 }
2880 err = ceph_encode_locks_to_buffer(inode, flocks,
2881 num_fcntl_locks,
2882 num_flock_locks);
2883 if (err) {
2884 kfree(flocks);
2885 if (err == -ENOSPC)
2886 goto encode_again;
2887 goto out_free;
2888 }
2889 /*
2890 * number of encoded locks is stable, so copy to pagelist
2891 */
2892 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
2893 (num_fcntl_locks+num_flock_locks) *
2894 sizeof(struct ceph_filelock));
2895 err = ceph_pagelist_append(pagelist, &rec, reclen);
2896 if (!err)
2897 err = ceph_locks_to_pagelist(flocks, pagelist,
2898 num_fcntl_locks,
2899 num_flock_locks);
2900 kfree(flocks);
2901 } else {
2902 err = ceph_pagelist_append(pagelist, &rec, reclen);
2903 }
2904
2905 recon_state->nr_caps++;
2906 out_free:
2907 kfree(path);
2908 out_dput:
2909 dput(dentry);
2910 return err;
2911 }
2912
2913
2914 /*
2915 * If an MDS fails and recovers, clients need to reconnect in order to
2916 * reestablish shared state. This includes all caps issued through
2917 * this session _and_ the snap_realm hierarchy. Because it's not
2918 * clear which snap realms the mds cares about, we send everything we
2919 * know about.. that ensures we'll then get any new info the
2920 * recovering MDS might have.
2921 *
2922 * This is a relatively heavyweight operation, but it's rare.
2923 *
2924 * called with mdsc->mutex held.
2925 */
2926 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2927 struct ceph_mds_session *session)
2928 {
2929 struct ceph_msg *reply;
2930 struct rb_node *p;
2931 int mds = session->s_mds;
2932 int err = -ENOMEM;
2933 int s_nr_caps;
2934 struct ceph_pagelist *pagelist;
2935 struct ceph_reconnect_state recon_state;
2936
2937 pr_info("mds%d reconnect start\n", mds);
2938
2939 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2940 if (!pagelist)
2941 goto fail_nopagelist;
2942 ceph_pagelist_init(pagelist);
2943
2944 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
2945 if (!reply)
2946 goto fail_nomsg;
2947
2948 mutex_lock(&session->s_mutex);
2949 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2950 session->s_seq = 0;
2951
2952 dout("session %p state %s\n", session,
2953 ceph_session_state_name(session->s_state));
2954
2955 spin_lock(&session->s_gen_ttl_lock);
2956 session->s_cap_gen++;
2957 spin_unlock(&session->s_gen_ttl_lock);
2958
2959 spin_lock(&session->s_cap_lock);
2960 /* don't know if session is readonly */
2961 session->s_readonly = 0;
2962 /*
2963 * notify __ceph_remove_cap() that we are composing cap reconnect.
2964 * If a cap get released before being added to the cap reconnect,
2965 * __ceph_remove_cap() should skip queuing cap release.
2966 */
2967 session->s_cap_reconnect = 1;
2968 /* drop old cap expires; we're about to reestablish that state */
2969 cleanup_cap_releases(mdsc, session);
2970
2971 /* trim unused caps to reduce MDS's cache rejoin time */
2972 if (mdsc->fsc->sb->s_root)
2973 shrink_dcache_parent(mdsc->fsc->sb->s_root);
2974
2975 ceph_con_close(&session->s_con);
2976 ceph_con_open(&session->s_con,
2977 CEPH_ENTITY_TYPE_MDS, mds,
2978 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2979
2980 /* replay unsafe requests */
2981 replay_unsafe_requests(mdsc, session);
2982
2983 down_read(&mdsc->snap_rwsem);
2984
2985 /* traverse this session's caps */
2986 s_nr_caps = session->s_nr_caps;
2987 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
2988 if (err)
2989 goto fail;
2990
2991 recon_state.nr_caps = 0;
2992 recon_state.pagelist = pagelist;
2993 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2994 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2995 if (err < 0)
2996 goto fail;
2997
2998 spin_lock(&session->s_cap_lock);
2999 session->s_cap_reconnect = 0;
3000 spin_unlock(&session->s_cap_lock);
3001
3002 /*
3003 * snaprealms. we provide mds with the ino, seq (version), and
3004 * parent for all of our realms. If the mds has any newer info,
3005 * it will tell us.
3006 */
3007 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3008 struct ceph_snap_realm *realm =
3009 rb_entry(p, struct ceph_snap_realm, node);
3010 struct ceph_mds_snaprealm_reconnect sr_rec;
3011
3012 dout(" adding snap realm %llx seq %lld parent %llx\n",
3013 realm->ino, realm->seq, realm->parent_ino);
3014 sr_rec.ino = cpu_to_le64(realm->ino);
3015 sr_rec.seq = cpu_to_le64(realm->seq);
3016 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3017 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3018 if (err)
3019 goto fail;
3020 }
3021
3022 if (recon_state.flock)
3023 reply->hdr.version = cpu_to_le16(2);
3024
3025 /* raced with cap release? */
3026 if (s_nr_caps != recon_state.nr_caps) {
3027 struct page *page = list_first_entry(&pagelist->head,
3028 struct page, lru);
3029 __le32 *addr = kmap_atomic(page);
3030 *addr = cpu_to_le32(recon_state.nr_caps);
3031 kunmap_atomic(addr);
3032 }
3033
3034 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3035 ceph_msg_data_add_pagelist(reply, pagelist);
3036
3037 ceph_early_kick_flushing_caps(mdsc, session);
3038
3039 ceph_con_send(&session->s_con, reply);
3040
3041 mutex_unlock(&session->s_mutex);
3042
3043 mutex_lock(&mdsc->mutex);
3044 __wake_requests(mdsc, &session->s_waiting);
3045 mutex_unlock(&mdsc->mutex);
3046
3047 up_read(&mdsc->snap_rwsem);
3048 return;
3049
3050 fail:
3051 ceph_msg_put(reply);
3052 up_read(&mdsc->snap_rwsem);
3053 mutex_unlock(&session->s_mutex);
3054 fail_nomsg:
3055 ceph_pagelist_release(pagelist);
3056 fail_nopagelist:
3057 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
3058 return;
3059 }
3060
3061
3062 /*
3063 * compare old and new mdsmaps, kicking requests
3064 * and closing out old connections as necessary
3065 *
3066 * called under mdsc->mutex.
3067 */
3068 static void check_new_map(struct ceph_mds_client *mdsc,
3069 struct ceph_mdsmap *newmap,
3070 struct ceph_mdsmap *oldmap)
3071 {
3072 int i;
3073 int oldstate, newstate;
3074 struct ceph_mds_session *s;
3075
3076 dout("check_new_map new %u old %u\n",
3077 newmap->m_epoch, oldmap->m_epoch);
3078
3079 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
3080 if (mdsc->sessions[i] == NULL)
3081 continue;
3082 s = mdsc->sessions[i];
3083 oldstate = ceph_mdsmap_get_state(oldmap, i);
3084 newstate = ceph_mdsmap_get_state(newmap, i);
3085
3086 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3087 i, ceph_mds_state_name(oldstate),
3088 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
3089 ceph_mds_state_name(newstate),
3090 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
3091 ceph_session_state_name(s->s_state));
3092
3093 if (i >= newmap->m_max_mds ||
3094 memcmp(ceph_mdsmap_get_addr(oldmap, i),
3095 ceph_mdsmap_get_addr(newmap, i),
3096 sizeof(struct ceph_entity_addr))) {
3097 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3098 /* the session never opened, just close it
3099 * out now */
3100 __wake_requests(mdsc, &s->s_waiting);
3101 __unregister_session(mdsc, s);
3102 } else {
3103 /* just close it */
3104 mutex_unlock(&mdsc->mutex);
3105 mutex_lock(&s->s_mutex);
3106 mutex_lock(&mdsc->mutex);
3107 ceph_con_close(&s->s_con);
3108 mutex_unlock(&s->s_mutex);
3109 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3110 }
3111 } else if (oldstate == newstate) {
3112 continue; /* nothing new with this mds */
3113 }
3114
3115 /*
3116 * send reconnect?
3117 */
3118 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
3119 newstate >= CEPH_MDS_STATE_RECONNECT) {
3120 mutex_unlock(&mdsc->mutex);
3121 send_mds_reconnect(mdsc, s);
3122 mutex_lock(&mdsc->mutex);
3123 }
3124
3125 /*
3126 * kick request on any mds that has gone active.
3127 */
3128 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3129 newstate >= CEPH_MDS_STATE_ACTIVE) {
3130 if (oldstate != CEPH_MDS_STATE_CREATING &&
3131 oldstate != CEPH_MDS_STATE_STARTING)
3132 pr_info("mds%d recovery completed\n", s->s_mds);
3133 kick_requests(mdsc, i);
3134 ceph_kick_flushing_caps(mdsc, s);
3135 wake_up_session_caps(s, 1);
3136 }
3137 }
3138
3139 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
3140 s = mdsc->sessions[i];
3141 if (!s)
3142 continue;
3143 if (!ceph_mdsmap_is_laggy(newmap, i))
3144 continue;
3145 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3146 s->s_state == CEPH_MDS_SESSION_HUNG ||
3147 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3148 dout(" connecting to export targets of laggy mds%d\n",
3149 i);
3150 __open_export_target_sessions(mdsc, s);
3151 }
3152 }
3153 }
3154
3155
3156
3157 /*
3158 * leases
3159 */
3160
3161 /*
3162 * caller must hold session s_mutex, dentry->d_lock
3163 */
3164 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3165 {
3166 struct ceph_dentry_info *di = ceph_dentry(dentry);
3167
3168 ceph_put_mds_session(di->lease_session);
3169 di->lease_session = NULL;
3170 }
3171
3172 static void handle_lease(struct ceph_mds_client *mdsc,
3173 struct ceph_mds_session *session,
3174 struct ceph_msg *msg)
3175 {
3176 struct super_block *sb = mdsc->fsc->sb;
3177 struct inode *inode;
3178 struct dentry *parent, *dentry;
3179 struct ceph_dentry_info *di;
3180 int mds = session->s_mds;
3181 struct ceph_mds_lease *h = msg->front.iov_base;
3182 u32 seq;
3183 struct ceph_vino vino;
3184 struct qstr dname;
3185 int release = 0;
3186
3187 dout("handle_lease from mds%d\n", mds);
3188
3189 /* decode */
3190 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3191 goto bad;
3192 vino.ino = le64_to_cpu(h->ino);
3193 vino.snap = CEPH_NOSNAP;
3194 seq = le32_to_cpu(h->seq);
3195 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3196 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3197 if (dname.len != get_unaligned_le32(h+1))
3198 goto bad;
3199
3200 /* lookup inode */
3201 inode = ceph_find_inode(sb, vino);
3202 dout("handle_lease %s, ino %llx %p %.*s\n",
3203 ceph_lease_op_name(h->action), vino.ino, inode,
3204 dname.len, dname.name);
3205
3206 mutex_lock(&session->s_mutex);
3207 session->s_seq++;
3208
3209 if (inode == NULL) {
3210 dout("handle_lease no inode %llx\n", vino.ino);
3211 goto release;
3212 }
3213
3214 /* dentry */
3215 parent = d_find_alias(inode);
3216 if (!parent) {
3217 dout("no parent dentry on inode %p\n", inode);
3218 WARN_ON(1);
3219 goto release; /* hrm... */
3220 }
3221 dname.hash = full_name_hash(dname.name, dname.len);
3222 dentry = d_lookup(parent, &dname);
3223 dput(parent);
3224 if (!dentry)
3225 goto release;
3226
3227 spin_lock(&dentry->d_lock);
3228 di = ceph_dentry(dentry);
3229 switch (h->action) {
3230 case CEPH_MDS_LEASE_REVOKE:
3231 if (di->lease_session == session) {
3232 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3233 h->seq = cpu_to_le32(di->lease_seq);
3234 __ceph_mdsc_drop_dentry_lease(dentry);
3235 }
3236 release = 1;
3237 break;
3238
3239 case CEPH_MDS_LEASE_RENEW:
3240 if (di->lease_session == session &&
3241 di->lease_gen == session->s_cap_gen &&
3242 di->lease_renew_from &&
3243 di->lease_renew_after == 0) {
3244 unsigned long duration =
3245 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
3246
3247 di->lease_seq = seq;
3248 dentry->d_time = di->lease_renew_from + duration;
3249 di->lease_renew_after = di->lease_renew_from +
3250 (duration >> 1);
3251 di->lease_renew_from = 0;
3252 }
3253 break;
3254 }
3255 spin_unlock(&dentry->d_lock);
3256 dput(dentry);
3257
3258 if (!release)
3259 goto out;
3260
3261 release:
3262 /* let's just reuse the same message */
3263 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3264 ceph_msg_get(msg);
3265 ceph_con_send(&session->s_con, msg);
3266
3267 out:
3268 iput(inode);
3269 mutex_unlock(&session->s_mutex);
3270 return;
3271
3272 bad:
3273 pr_err("corrupt lease message\n");
3274 ceph_msg_dump(msg);
3275 }
3276
3277 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3278 struct inode *inode,
3279 struct dentry *dentry, char action,
3280 u32 seq)
3281 {
3282 struct ceph_msg *msg;
3283 struct ceph_mds_lease *lease;
3284 int len = sizeof(*lease) + sizeof(u32);
3285 int dnamelen = 0;
3286
3287 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3288 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3289 dnamelen = dentry->d_name.len;
3290 len += dnamelen;
3291
3292 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
3293 if (!msg)
3294 return;
3295 lease = msg->front.iov_base;
3296 lease->action = action;
3297 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3298 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3299 lease->seq = cpu_to_le32(seq);
3300 put_unaligned_le32(dnamelen, lease + 1);
3301 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3302
3303 /*
3304 * if this is a preemptive lease RELEASE, no need to
3305 * flush request stream, since the actual request will
3306 * soon follow.
3307 */
3308 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3309
3310 ceph_con_send(&session->s_con, msg);
3311 }
3312
3313 /*
3314 * Preemptively release a lease we expect to invalidate anyway.
3315 * Pass @inode always, @dentry is optional.
3316 */
3317 void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
3318 struct dentry *dentry)
3319 {
3320 struct ceph_dentry_info *di;
3321 struct ceph_mds_session *session;
3322 u32 seq;
3323
3324 BUG_ON(inode == NULL);
3325 BUG_ON(dentry == NULL);
3326
3327 /* is dentry lease valid? */
3328 spin_lock(&dentry->d_lock);
3329 di = ceph_dentry(dentry);
3330 if (!di || !di->lease_session ||
3331 di->lease_session->s_mds < 0 ||
3332 di->lease_gen != di->lease_session->s_cap_gen ||
3333 !time_before(jiffies, dentry->d_time)) {
3334 dout("lease_release inode %p dentry %p -- "
3335 "no lease\n",
3336 inode, dentry);
3337 spin_unlock(&dentry->d_lock);
3338 return;
3339 }
3340
3341 /* we do have a lease on this dentry; note mds and seq */
3342 session = ceph_get_mds_session(di->lease_session);
3343 seq = di->lease_seq;
3344 __ceph_mdsc_drop_dentry_lease(dentry);
3345 spin_unlock(&dentry->d_lock);
3346
3347 dout("lease_release inode %p dentry %p to mds%d\n",
3348 inode, dentry, session->s_mds);
3349 ceph_mdsc_lease_send_msg(session, inode, dentry,
3350 CEPH_MDS_LEASE_RELEASE, seq);
3351 ceph_put_mds_session(session);
3352 }
3353
3354 /*
3355 * drop all leases (and dentry refs) in preparation for umount
3356 */
3357 static void drop_leases(struct ceph_mds_client *mdsc)
3358 {
3359 int i;
3360
3361 dout("drop_leases\n");
3362 mutex_lock(&mdsc->mutex);
3363 for (i = 0; i < mdsc->max_sessions; i++) {
3364 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3365 if (!s)
3366 continue;
3367 mutex_unlock(&mdsc->mutex);
3368 mutex_lock(&s->s_mutex);
3369 mutex_unlock(&s->s_mutex);
3370 ceph_put_mds_session(s);
3371 mutex_lock(&mdsc->mutex);
3372 }
3373 mutex_unlock(&mdsc->mutex);
3374 }
3375
3376
3377
3378 /*
3379 * delayed work -- periodically trim expired leases, renew caps with mds
3380 */
3381 static void schedule_delayed(struct ceph_mds_client *mdsc)
3382 {
3383 int delay = 5;
3384 unsigned hz = round_jiffies_relative(HZ * delay);
3385 schedule_delayed_work(&mdsc->delayed_work, hz);
3386 }
3387
3388 static void delayed_work(struct work_struct *work)
3389 {
3390 int i;
3391 struct ceph_mds_client *mdsc =
3392 container_of(work, struct ceph_mds_client, delayed_work.work);
3393 int renew_interval;
3394 int renew_caps;
3395
3396 dout("mdsc delayed_work\n");
3397 ceph_check_delayed_caps(mdsc);
3398
3399 mutex_lock(&mdsc->mutex);
3400 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3401 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3402 mdsc->last_renew_caps);
3403 if (renew_caps)
3404 mdsc->last_renew_caps = jiffies;
3405
3406 for (i = 0; i < mdsc->max_sessions; i++) {
3407 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3408 if (s == NULL)
3409 continue;
3410 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3411 dout("resending session close request for mds%d\n",
3412 s->s_mds);
3413 request_close_session(mdsc, s);
3414 ceph_put_mds_session(s);
3415 continue;
3416 }
3417 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3418 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3419 s->s_state = CEPH_MDS_SESSION_HUNG;
3420 pr_info("mds%d hung\n", s->s_mds);
3421 }
3422 }
3423 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3424 /* this mds is failed or recovering, just wait */
3425 ceph_put_mds_session(s);
3426 continue;
3427 }
3428 mutex_unlock(&mdsc->mutex);
3429
3430 mutex_lock(&s->s_mutex);
3431 if (renew_caps)
3432 send_renew_caps(mdsc, s);
3433 else
3434 ceph_con_keepalive(&s->s_con);
3435 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3436 s->s_state == CEPH_MDS_SESSION_HUNG)
3437 ceph_send_cap_releases(mdsc, s);
3438 mutex_unlock(&s->s_mutex);
3439 ceph_put_mds_session(s);
3440
3441 mutex_lock(&mdsc->mutex);
3442 }
3443 mutex_unlock(&mdsc->mutex);
3444
3445 schedule_delayed(mdsc);
3446 }
3447
3448 int ceph_mdsc_init(struct ceph_fs_client *fsc)
3449
3450 {
3451 struct ceph_mds_client *mdsc;
3452
3453 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3454 if (!mdsc)
3455 return -ENOMEM;
3456 mdsc->fsc = fsc;
3457 fsc->mdsc = mdsc;
3458 mutex_init(&mdsc->mutex);
3459 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3460 if (mdsc->mdsmap == NULL) {
3461 kfree(mdsc);
3462 return -ENOMEM;
3463 }
3464
3465 init_completion(&mdsc->safe_umount_waiters);
3466 init_waitqueue_head(&mdsc->session_close_wq);
3467 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3468 mdsc->sessions = NULL;
3469 atomic_set(&mdsc->num_sessions, 0);
3470 mdsc->max_sessions = 0;
3471 mdsc->stopping = 0;
3472 mdsc->last_snap_seq = 0;
3473 init_rwsem(&mdsc->snap_rwsem);
3474 mdsc->snap_realms = RB_ROOT;
3475 INIT_LIST_HEAD(&mdsc->snap_empty);
3476 spin_lock_init(&mdsc->snap_empty_lock);
3477 mdsc->last_tid = 0;
3478 mdsc->oldest_tid = 0;
3479 mdsc->request_tree = RB_ROOT;
3480 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3481 mdsc->last_renew_caps = jiffies;
3482 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3483 spin_lock_init(&mdsc->cap_delay_lock);
3484 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3485 spin_lock_init(&mdsc->snap_flush_lock);
3486 mdsc->last_cap_flush_tid = 1;
3487 mdsc->cap_flush_tree = RB_ROOT;
3488 INIT_LIST_HEAD(&mdsc->cap_dirty);
3489 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3490 mdsc->num_cap_flushing = 0;
3491 spin_lock_init(&mdsc->cap_dirty_lock);
3492 init_waitqueue_head(&mdsc->cap_flushing_wq);
3493 spin_lock_init(&mdsc->dentry_lru_lock);
3494 INIT_LIST_HEAD(&mdsc->dentry_lru);
3495
3496 ceph_caps_init(mdsc);
3497 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3498
3499 init_rwsem(&mdsc->pool_perm_rwsem);
3500 mdsc->pool_perm_tree = RB_ROOT;
3501
3502 return 0;
3503 }
3504
3505 /*
3506 * Wait for safe replies on open mds requests. If we time out, drop
3507 * all requests from the tree to avoid dangling dentry refs.
3508 */
3509 static void wait_requests(struct ceph_mds_client *mdsc)
3510 {
3511 struct ceph_options *opts = mdsc->fsc->client->options;
3512 struct ceph_mds_request *req;
3513
3514 mutex_lock(&mdsc->mutex);
3515 if (__get_oldest_req(mdsc)) {
3516 mutex_unlock(&mdsc->mutex);
3517
3518 dout("wait_requests waiting for requests\n");
3519 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3520 ceph_timeout_jiffies(opts->mount_timeout));
3521
3522 /* tear down remaining requests */
3523 mutex_lock(&mdsc->mutex);
3524 while ((req = __get_oldest_req(mdsc))) {
3525 dout("wait_requests timed out on tid %llu\n",
3526 req->r_tid);
3527 __unregister_request(mdsc, req);
3528 }
3529 }
3530 mutex_unlock(&mdsc->mutex);
3531 dout("wait_requests done\n");
3532 }
3533
3534 /*
3535 * called before mount is ro, and before dentries are torn down.
3536 * (hmm, does this still race with new lookups?)
3537 */
3538 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3539 {
3540 dout("pre_umount\n");
3541 mdsc->stopping = 1;
3542
3543 drop_leases(mdsc);
3544 ceph_flush_dirty_caps(mdsc);
3545 wait_requests(mdsc);
3546
3547 /*
3548 * wait for reply handlers to drop their request refs and
3549 * their inode/dcache refs
3550 */
3551 ceph_msgr_flush();
3552 }
3553
3554 /*
3555 * wait for all write mds requests to flush.
3556 */
3557 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3558 {
3559 struct ceph_mds_request *req = NULL, *nextreq;
3560 struct rb_node *n;
3561
3562 mutex_lock(&mdsc->mutex);
3563 dout("wait_unsafe_requests want %lld\n", want_tid);
3564 restart:
3565 req = __get_oldest_req(mdsc);
3566 while (req && req->r_tid <= want_tid) {
3567 /* find next request */
3568 n = rb_next(&req->r_node);
3569 if (n)
3570 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3571 else
3572 nextreq = NULL;
3573 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3574 (req->r_op & CEPH_MDS_OP_WRITE)) {
3575 /* write op */
3576 ceph_mdsc_get_request(req);
3577 if (nextreq)
3578 ceph_mdsc_get_request(nextreq);
3579 mutex_unlock(&mdsc->mutex);
3580 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3581 req->r_tid, want_tid);
3582 wait_for_completion(&req->r_safe_completion);
3583 mutex_lock(&mdsc->mutex);
3584 ceph_mdsc_put_request(req);
3585 if (!nextreq)
3586 break; /* next dne before, so we're done! */
3587 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3588 /* next request was removed from tree */
3589 ceph_mdsc_put_request(nextreq);
3590 goto restart;
3591 }
3592 ceph_mdsc_put_request(nextreq); /* won't go away */
3593 }
3594 req = nextreq;
3595 }
3596 mutex_unlock(&mdsc->mutex);
3597 dout("wait_unsafe_requests done\n");
3598 }
3599
3600 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3601 {
3602 u64 want_tid, want_flush, want_snap;
3603
3604 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3605 return;
3606
3607 dout("sync\n");
3608 mutex_lock(&mdsc->mutex);
3609 want_tid = mdsc->last_tid;
3610 mutex_unlock(&mdsc->mutex);
3611
3612 ceph_flush_dirty_caps(mdsc);
3613 spin_lock(&mdsc->cap_dirty_lock);
3614 want_flush = mdsc->last_cap_flush_tid;
3615 spin_unlock(&mdsc->cap_dirty_lock);
3616
3617 down_read(&mdsc->snap_rwsem);
3618 want_snap = mdsc->last_snap_seq;
3619 up_read(&mdsc->snap_rwsem);
3620
3621 dout("sync want tid %lld flush_seq %lld snap_seq %lld\n",
3622 want_tid, want_flush, want_snap);
3623
3624 wait_unsafe_requests(mdsc, want_tid);
3625 wait_caps_flush(mdsc, want_flush, want_snap);
3626 }
3627
3628 /*
3629 * true if all sessions are closed, or we force unmount
3630 */
3631 static bool done_closing_sessions(struct ceph_mds_client *mdsc)
3632 {
3633 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3634 return true;
3635 return atomic_read(&mdsc->num_sessions) == 0;
3636 }
3637
3638 /*
3639 * called after sb is ro.
3640 */
3641 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3642 {
3643 struct ceph_options *opts = mdsc->fsc->client->options;
3644 struct ceph_mds_session *session;
3645 int i;
3646
3647 dout("close_sessions\n");
3648
3649 /* close sessions */
3650 mutex_lock(&mdsc->mutex);
3651 for (i = 0; i < mdsc->max_sessions; i++) {
3652 session = __ceph_lookup_mds_session(mdsc, i);
3653 if (!session)
3654 continue;
3655 mutex_unlock(&mdsc->mutex);
3656 mutex_lock(&session->s_mutex);
3657 __close_session(mdsc, session);
3658 mutex_unlock(&session->s_mutex);
3659 ceph_put_mds_session(session);
3660 mutex_lock(&mdsc->mutex);
3661 }
3662 mutex_unlock(&mdsc->mutex);
3663
3664 dout("waiting for sessions to close\n");
3665 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3666 ceph_timeout_jiffies(opts->mount_timeout));
3667
3668 /* tear down remaining sessions */
3669 mutex_lock(&mdsc->mutex);
3670 for (i = 0; i < mdsc->max_sessions; i++) {
3671 if (mdsc->sessions[i]) {
3672 session = get_session(mdsc->sessions[i]);
3673 __unregister_session(mdsc, session);
3674 mutex_unlock(&mdsc->mutex);
3675 mutex_lock(&session->s_mutex);
3676 remove_session_caps(session);
3677 mutex_unlock(&session->s_mutex);
3678 ceph_put_mds_session(session);
3679 mutex_lock(&mdsc->mutex);
3680 }
3681 }
3682 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3683 mutex_unlock(&mdsc->mutex);
3684
3685 ceph_cleanup_empty_realms(mdsc);
3686
3687 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3688
3689 dout("stopped\n");
3690 }
3691
3692 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3693 {
3694 struct ceph_mds_session *session;
3695 int mds;
3696
3697 dout("force umount\n");
3698
3699 mutex_lock(&mdsc->mutex);
3700 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3701 session = __ceph_lookup_mds_session(mdsc, mds);
3702 if (!session)
3703 continue;
3704 mutex_unlock(&mdsc->mutex);
3705 mutex_lock(&session->s_mutex);
3706 __close_session(mdsc, session);
3707 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3708 cleanup_session_requests(mdsc, session);
3709 remove_session_caps(session);
3710 }
3711 mutex_unlock(&session->s_mutex);
3712 ceph_put_mds_session(session);
3713 mutex_lock(&mdsc->mutex);
3714 kick_requests(mdsc, mds);
3715 }
3716 __wake_requests(mdsc, &mdsc->waiting_for_map);
3717 mutex_unlock(&mdsc->mutex);
3718 }
3719
3720 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3721 {
3722 dout("stop\n");
3723 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3724 if (mdsc->mdsmap)
3725 ceph_mdsmap_destroy(mdsc->mdsmap);
3726 kfree(mdsc->sessions);
3727 ceph_caps_finalize(mdsc);
3728 ceph_pool_perm_destroy(mdsc);
3729 }
3730
3731 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3732 {
3733 struct ceph_mds_client *mdsc = fsc->mdsc;
3734
3735 dout("mdsc_destroy %p\n", mdsc);
3736 ceph_mdsc_stop(mdsc);
3737
3738 /* flush out any connection work with references to us */
3739 ceph_msgr_flush();
3740
3741 fsc->mdsc = NULL;
3742 kfree(mdsc);
3743 dout("mdsc_destroy %p done\n", mdsc);
3744 }
3745
3746
3747 /*
3748 * handle mds map update.
3749 */
3750 void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3751 {
3752 u32 epoch;
3753 u32 maplen;
3754 void *p = msg->front.iov_base;
3755 void *end = p + msg->front.iov_len;
3756 struct ceph_mdsmap *newmap, *oldmap;
3757 struct ceph_fsid fsid;
3758 int err = -EINVAL;
3759
3760 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3761 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3762 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3763 return;
3764 epoch = ceph_decode_32(&p);
3765 maplen = ceph_decode_32(&p);
3766 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3767
3768 /* do we need it? */
3769 mutex_lock(&mdsc->mutex);
3770 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3771 dout("handle_map epoch %u <= our %u\n",
3772 epoch, mdsc->mdsmap->m_epoch);
3773 mutex_unlock(&mdsc->mutex);
3774 return;
3775 }
3776
3777 newmap = ceph_mdsmap_decode(&p, end);
3778 if (IS_ERR(newmap)) {
3779 err = PTR_ERR(newmap);
3780 goto bad_unlock;
3781 }
3782
3783 /* swap into place */
3784 if (mdsc->mdsmap) {
3785 oldmap = mdsc->mdsmap;
3786 mdsc->mdsmap = newmap;
3787 check_new_map(mdsc, newmap, oldmap);
3788 ceph_mdsmap_destroy(oldmap);
3789 } else {
3790 mdsc->mdsmap = newmap; /* first mds map */
3791 }
3792 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3793
3794 __wake_requests(mdsc, &mdsc->waiting_for_map);
3795 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
3796 mdsc->mdsmap->m_epoch);
3797
3798 mutex_unlock(&mdsc->mutex);
3799 schedule_delayed(mdsc);
3800 return;
3801
3802 bad_unlock:
3803 mutex_unlock(&mdsc->mutex);
3804 bad:
3805 pr_err("error decoding mdsmap %d\n", err);
3806 return;
3807 }
3808
3809 static struct ceph_connection *con_get(struct ceph_connection *con)
3810 {
3811 struct ceph_mds_session *s = con->private;
3812
3813 if (get_session(s)) {
3814 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3815 return con;
3816 }
3817 dout("mdsc con_get %p FAIL\n", s);
3818 return NULL;
3819 }
3820
3821 static void con_put(struct ceph_connection *con)
3822 {
3823 struct ceph_mds_session *s = con->private;
3824
3825 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
3826 ceph_put_mds_session(s);
3827 }
3828
3829 /*
3830 * if the client is unresponsive for long enough, the mds will kill
3831 * the session entirely.
3832 */
3833 static void peer_reset(struct ceph_connection *con)
3834 {
3835 struct ceph_mds_session *s = con->private;
3836 struct ceph_mds_client *mdsc = s->s_mdsc;
3837
3838 pr_warn("mds%d closed our session\n", s->s_mds);
3839 send_mds_reconnect(mdsc, s);
3840 }
3841
3842 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3843 {
3844 struct ceph_mds_session *s = con->private;
3845 struct ceph_mds_client *mdsc = s->s_mdsc;
3846 int type = le16_to_cpu(msg->hdr.type);
3847
3848 mutex_lock(&mdsc->mutex);
3849 if (__verify_registered_session(mdsc, s) < 0) {
3850 mutex_unlock(&mdsc->mutex);
3851 goto out;
3852 }
3853 mutex_unlock(&mdsc->mutex);
3854
3855 switch (type) {
3856 case CEPH_MSG_MDS_MAP:
3857 ceph_mdsc_handle_map(mdsc, msg);
3858 break;
3859 case CEPH_MSG_CLIENT_SESSION:
3860 handle_session(s, msg);
3861 break;
3862 case CEPH_MSG_CLIENT_REPLY:
3863 handle_reply(s, msg);
3864 break;
3865 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3866 handle_forward(mdsc, s, msg);
3867 break;
3868 case CEPH_MSG_CLIENT_CAPS:
3869 ceph_handle_caps(s, msg);
3870 break;
3871 case CEPH_MSG_CLIENT_SNAP:
3872 ceph_handle_snap(mdsc, s, msg);
3873 break;
3874 case CEPH_MSG_CLIENT_LEASE:
3875 handle_lease(mdsc, s, msg);
3876 break;
3877
3878 default:
3879 pr_err("received unknown message type %d %s\n", type,
3880 ceph_msg_type_name(type));
3881 }
3882 out:
3883 ceph_msg_put(msg);
3884 }
3885
3886 /*
3887 * authentication
3888 */
3889
3890 /*
3891 * Note: returned pointer is the address of a structure that's
3892 * managed separately. Caller must *not* attempt to free it.
3893 */
3894 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
3895 int *proto, int force_new)
3896 {
3897 struct ceph_mds_session *s = con->private;
3898 struct ceph_mds_client *mdsc = s->s_mdsc;
3899 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3900 struct ceph_auth_handshake *auth = &s->s_auth;
3901
3902 if (force_new && auth->authorizer) {
3903 ceph_auth_destroy_authorizer(ac, auth->authorizer);
3904 auth->authorizer = NULL;
3905 }
3906 if (!auth->authorizer) {
3907 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3908 auth);
3909 if (ret)
3910 return ERR_PTR(ret);
3911 } else {
3912 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3913 auth);
3914 if (ret)
3915 return ERR_PTR(ret);
3916 }
3917 *proto = ac->protocol;
3918
3919 return auth;
3920 }
3921
3922
3923 static int verify_authorizer_reply(struct ceph_connection *con, int len)
3924 {
3925 struct ceph_mds_session *s = con->private;
3926 struct ceph_mds_client *mdsc = s->s_mdsc;
3927 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3928
3929 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
3930 }
3931
3932 static int invalidate_authorizer(struct ceph_connection *con)
3933 {
3934 struct ceph_mds_session *s = con->private;
3935 struct ceph_mds_client *mdsc = s->s_mdsc;
3936 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3937
3938 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3939
3940 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
3941 }
3942
3943 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3944 struct ceph_msg_header *hdr, int *skip)
3945 {
3946 struct ceph_msg *msg;
3947 int type = (int) le16_to_cpu(hdr->type);
3948 int front_len = (int) le32_to_cpu(hdr->front_len);
3949
3950 if (con->in_msg)
3951 return con->in_msg;
3952
3953 *skip = 0;
3954 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3955 if (!msg) {
3956 pr_err("unable to allocate msg type %d len %d\n",
3957 type, front_len);
3958 return NULL;
3959 }
3960
3961 return msg;
3962 }
3963
3964 static int mds_sign_message(struct ceph_msg *msg)
3965 {
3966 struct ceph_mds_session *s = msg->con->private;
3967 struct ceph_auth_handshake *auth = &s->s_auth;
3968
3969 return ceph_auth_sign_message(auth, msg);
3970 }
3971
3972 static int mds_check_message_signature(struct ceph_msg *msg)
3973 {
3974 struct ceph_mds_session *s = msg->con->private;
3975 struct ceph_auth_handshake *auth = &s->s_auth;
3976
3977 return ceph_auth_check_message_signature(auth, msg);
3978 }
3979
3980 static const struct ceph_connection_operations mds_con_ops = {
3981 .get = con_get,
3982 .put = con_put,
3983 .dispatch = dispatch,
3984 .get_authorizer = get_authorizer,
3985 .verify_authorizer_reply = verify_authorizer_reply,
3986 .invalidate_authorizer = invalidate_authorizer,
3987 .peer_reset = peer_reset,
3988 .alloc_msg = mds_alloc_msg,
3989 .sign_message = mds_sign_message,
3990 .check_message_signature = mds_check_message_signature,
3991 };
3992
3993 /* eof */
Linux with added FPC-III support