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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / fs / ceph / mds_client.c
blob2e8f90f96540291ab412703133d2a4278edbac71
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/fs.h>
5 #include <linux/wait.h>
6 #include <linux/slab.h>
7 #include <linux/gfp.h>
8 #include <linux/sched.h>
9 #include <linux/debugfs.h>
10 #include <linux/seq_file.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45 * are no longer valid.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 unsigned msg_version;
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 info->pool_ns_len = 0;
104 info->pool_ns_data = NULL;
105 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
106 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
107 if (info->pool_ns_len > 0) {
108 ceph_decode_need(p, end, info->pool_ns_len, bad);
109 info->pool_ns_data = *p;
110 *p += info->pool_ns_len;
111 }
112 }
113
114 return 0;
115 bad:
116 return err;
117 }
118
119 /*
120 * parse a normal reply, which may contain a (dir+)dentry and/or a
121 * target inode.
122 */
123 static int parse_reply_info_trace(void **p, void *end,
124 struct ceph_mds_reply_info_parsed *info,
125 u64 features)
126 {
127 int err;
128
129 if (info->head->is_dentry) {
130 err = parse_reply_info_in(p, end, &info->diri, features);
131 if (err < 0)
132 goto out_bad;
133
134 if (unlikely(*p + sizeof(*info->dirfrag) > end))
135 goto bad;
136 info->dirfrag = *p;
137 *p += sizeof(*info->dirfrag) +
138 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
139 if (unlikely(*p > end))
140 goto bad;
141
142 ceph_decode_32_safe(p, end, info->dname_len, bad);
143 ceph_decode_need(p, end, info->dname_len, bad);
144 info->dname = *p;
145 *p += info->dname_len;
146 info->dlease = *p;
147 *p += sizeof(*info->dlease);
148 }
149
150 if (info->head->is_target) {
151 err = parse_reply_info_in(p, end, &info->targeti, features);
152 if (err < 0)
153 goto out_bad;
154 }
155
156 if (unlikely(*p != end))
157 goto bad;
158 return 0;
159
160 bad:
161 err = -EIO;
162 out_bad:
163 pr_err("problem parsing mds trace %d\n", err);
164 return err;
165 }
166
167 /*
168 * parse readdir results
169 */
170 static int parse_reply_info_dir(void **p, void *end,
171 struct ceph_mds_reply_info_parsed *info,
172 u64 features)
173 {
174 u32 num, i = 0;
175 int err;
176
177 info->dir_dir = *p;
178 if (*p + sizeof(*info->dir_dir) > end)
179 goto bad;
180 *p += sizeof(*info->dir_dir) +
181 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
182 if (*p > end)
183 goto bad;
184
185 ceph_decode_need(p, end, sizeof(num) + 2, bad);
186 num = ceph_decode_32(p);
187 {
188 u16 flags = ceph_decode_16(p);
189 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
190 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
191 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
192 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
193 }
194 if (num == 0)
195 goto done;
196
197 BUG_ON(!info->dir_entries);
198 if ((unsigned long)(info->dir_entries + num) >
199 (unsigned long)info->dir_entries + info->dir_buf_size) {
200 pr_err("dir contents are larger than expected\n");
201 WARN_ON(1);
202 goto bad;
203 }
204
205 info->dir_nr = num;
206 while (num) {
207 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
208 /* dentry */
209 ceph_decode_need(p, end, sizeof(u32)*2, bad);
210 rde->name_len = ceph_decode_32(p);
211 ceph_decode_need(p, end, rde->name_len, bad);
212 rde->name = *p;
213 *p += rde->name_len;
214 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
215 rde->lease = *p;
216 *p += sizeof(struct ceph_mds_reply_lease);
217
218 /* inode */
219 err = parse_reply_info_in(p, end, &rde->inode, features);
220 if (err < 0)
221 goto out_bad;
222 /* ceph_readdir_prepopulate() will update it */
223 rde->offset = 0;
224 i++;
225 num--;
226 }
227
228 done:
229 if (*p != end)
230 goto bad;
231 return 0;
232
233 bad:
234 err = -EIO;
235 out_bad:
236 pr_err("problem parsing dir contents %d\n", err);
237 return err;
238 }
239
240 /*
241 * parse fcntl F_GETLK results
242 */
243 static int parse_reply_info_filelock(void **p, void *end,
244 struct ceph_mds_reply_info_parsed *info,
245 u64 features)
246 {
247 if (*p + sizeof(*info->filelock_reply) > end)
248 goto bad;
249
250 info->filelock_reply = *p;
251 *p += sizeof(*info->filelock_reply);
252
253 if (unlikely(*p != end))
254 goto bad;
255 return 0;
256
257 bad:
258 return -EIO;
259 }
260
261 /*
262 * parse create results
263 */
264 static int parse_reply_info_create(void **p, void *end,
265 struct ceph_mds_reply_info_parsed *info,
266 u64 features)
267 {
268 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
269 if (*p == end) {
270 info->has_create_ino = false;
271 } else {
272 info->has_create_ino = true;
273 info->ino = ceph_decode_64(p);
274 }
275 }
276
277 if (unlikely(*p != end))
278 goto bad;
279 return 0;
280
281 bad:
282 return -EIO;
283 }
284
285 /*
286 * parse extra results
287 */
288 static int parse_reply_info_extra(void **p, void *end,
289 struct ceph_mds_reply_info_parsed *info,
290 u64 features)
291 {
292 u32 op = le32_to_cpu(info->head->op);
293
294 if (op == CEPH_MDS_OP_GETFILELOCK)
295 return parse_reply_info_filelock(p, end, info, features);
296 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
297 return parse_reply_info_dir(p, end, info, features);
298 else if (op == CEPH_MDS_OP_CREATE)
299 return parse_reply_info_create(p, end, info, features);
300 else
301 return -EIO;
302 }
303
304 /*
305 * parse entire mds reply
306 */
307 static int parse_reply_info(struct ceph_msg *msg,
308 struct ceph_mds_reply_info_parsed *info,
309 u64 features)
310 {
311 void *p, *end;
312 u32 len;
313 int err;
314
315 info->head = msg->front.iov_base;
316 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
317 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
318
319 /* trace */
320 ceph_decode_32_safe(&p, end, len, bad);
321 if (len > 0) {
322 ceph_decode_need(&p, end, len, bad);
323 err = parse_reply_info_trace(&p, p+len, info, features);
324 if (err < 0)
325 goto out_bad;
326 }
327
328 /* extra */
329 ceph_decode_32_safe(&p, end, len, bad);
330 if (len > 0) {
331 ceph_decode_need(&p, end, len, bad);
332 err = parse_reply_info_extra(&p, p+len, info, features);
333 if (err < 0)
334 goto out_bad;
335 }
336
337 /* snap blob */
338 ceph_decode_32_safe(&p, end, len, bad);
339 info->snapblob_len = len;
340 info->snapblob = p;
341 p += len;
342
343 if (p != end)
344 goto bad;
345 return 0;
346
347 bad:
348 err = -EIO;
349 out_bad:
350 pr_err("mds parse_reply err %d\n", err);
351 return err;
352 }
353
354 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
355 {
356 if (!info->dir_entries)
357 return;
358 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
359 }
360
361
362 /*
363 * sessions
364 */
365 const char *ceph_session_state_name(int s)
366 {
367 switch (s) {
368 case CEPH_MDS_SESSION_NEW: return "new";
369 case CEPH_MDS_SESSION_OPENING: return "opening";
370 case CEPH_MDS_SESSION_OPEN: return "open";
371 case CEPH_MDS_SESSION_HUNG: return "hung";
372 case CEPH_MDS_SESSION_CLOSING: return "closing";
373 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
374 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
375 case CEPH_MDS_SESSION_REJECTED: return "rejected";
376 default: return "???";
377 }
378 }
379
380 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
381 {
382 if (refcount_inc_not_zero(&s->s_ref)) {
383 dout("mdsc get_session %p %d -> %d\n", s,
384 refcount_read(&s->s_ref)-1, refcount_read(&s->s_ref));
385 return s;
386 } else {
387 dout("mdsc get_session %p 0 -- FAIL", s);
388 return NULL;
389 }
390 }
391
392 void ceph_put_mds_session(struct ceph_mds_session *s)
393 {
394 dout("mdsc put_session %p %d -> %d\n", s,
395 refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1);
396 if (refcount_dec_and_test(&s->s_ref)) {
397 if (s->s_auth.authorizer)
398 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
399 kfree(s);
400 }
401 }
402
403 /*
404 * called under mdsc->mutex
405 */
406 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
407 int mds)
408 {
409 struct ceph_mds_session *session;
410
411 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
412 return NULL;
413 session = mdsc->sessions[mds];
414 dout("lookup_mds_session %p %d\n", session,
415 refcount_read(&session->s_ref));
416 get_session(session);
417 return session;
418 }
419
420 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
421 {
422 if (mds >= mdsc->max_sessions)
423 return false;
424 return mdsc->sessions[mds];
425 }
426
427 static int __verify_registered_session(struct ceph_mds_client *mdsc,
428 struct ceph_mds_session *s)
429 {
430 if (s->s_mds >= mdsc->max_sessions ||
431 mdsc->sessions[s->s_mds] != s)
432 return -ENOENT;
433 return 0;
434 }
435
436 /*
437 * create+register a new session for given mds.
438 * called under mdsc->mutex.
439 */
440 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
441 int mds)
442 {
443 struct ceph_mds_session *s;
444
445 if (mds >= mdsc->mdsmap->m_num_mds)
446 return ERR_PTR(-EINVAL);
447
448 s = kzalloc(sizeof(*s), GFP_NOFS);
449 if (!s)
450 return ERR_PTR(-ENOMEM);
451 s->s_mdsc = mdsc;
452 s->s_mds = mds;
453 s->s_state = CEPH_MDS_SESSION_NEW;
454 s->s_ttl = 0;
455 s->s_seq = 0;
456 mutex_init(&s->s_mutex);
457
458 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
459
460 spin_lock_init(&s->s_gen_ttl_lock);
461 s->s_cap_gen = 0;
462 s->s_cap_ttl = jiffies - 1;
463
464 spin_lock_init(&s->s_cap_lock);
465 s->s_renew_requested = 0;
466 s->s_renew_seq = 0;
467 INIT_LIST_HEAD(&s->s_caps);
468 s->s_nr_caps = 0;
469 s->s_trim_caps = 0;
470 refcount_set(&s->s_ref, 1);
471 INIT_LIST_HEAD(&s->s_waiting);
472 INIT_LIST_HEAD(&s->s_unsafe);
473 s->s_num_cap_releases = 0;
474 s->s_cap_reconnect = 0;
475 s->s_cap_iterator = NULL;
476 INIT_LIST_HEAD(&s->s_cap_releases);
477 INIT_LIST_HEAD(&s->s_cap_flushing);
478
479 dout("register_session mds%d\n", mds);
480 if (mds >= mdsc->max_sessions) {
481 int newmax = 1 << get_count_order(mds+1);
482 struct ceph_mds_session **sa;
483
484 dout("register_session realloc to %d\n", newmax);
485 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
486 if (!sa)
487 goto fail_realloc;
488 if (mdsc->sessions) {
489 memcpy(sa, mdsc->sessions,
490 mdsc->max_sessions * sizeof(void *));
491 kfree(mdsc->sessions);
492 }
493 mdsc->sessions = sa;
494 mdsc->max_sessions = newmax;
495 }
496 mdsc->sessions[mds] = s;
497 atomic_inc(&mdsc->num_sessions);
498 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
499
500 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
501 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
502
503 return s;
504
505 fail_realloc:
506 kfree(s);
507 return ERR_PTR(-ENOMEM);
508 }
509
510 /*
511 * called under mdsc->mutex
512 */
513 static void __unregister_session(struct ceph_mds_client *mdsc,
514 struct ceph_mds_session *s)
515 {
516 dout("__unregister_session mds%d %p\n", s->s_mds, s);
517 BUG_ON(mdsc->sessions[s->s_mds] != s);
518 mdsc->sessions[s->s_mds] = NULL;
519 ceph_con_close(&s->s_con);
520 ceph_put_mds_session(s);
521 atomic_dec(&mdsc->num_sessions);
522 }
523
524 /*
525 * drop session refs in request.
526 *
527 * should be last request ref, or hold mdsc->mutex
528 */
529 static void put_request_session(struct ceph_mds_request *req)
530 {
531 if (req->r_session) {
532 ceph_put_mds_session(req->r_session);
533 req->r_session = NULL;
534 }
535 }
536
537 void ceph_mdsc_release_request(struct kref *kref)
538 {
539 struct ceph_mds_request *req = container_of(kref,
540 struct ceph_mds_request,
541 r_kref);
542 destroy_reply_info(&req->r_reply_info);
543 if (req->r_request)
544 ceph_msg_put(req->r_request);
545 if (req->r_reply)
546 ceph_msg_put(req->r_reply);
547 if (req->r_inode) {
548 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
549 iput(req->r_inode);
550 }
551 if (req->r_parent)
552 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
553 iput(req->r_target_inode);
554 if (req->r_dentry)
555 dput(req->r_dentry);
556 if (req->r_old_dentry)
557 dput(req->r_old_dentry);
558 if (req->r_old_dentry_dir) {
559 /*
560 * track (and drop pins for) r_old_dentry_dir
561 * separately, since r_old_dentry's d_parent may have
562 * changed between the dir mutex being dropped and
563 * this request being freed.
564 */
565 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
566 CEPH_CAP_PIN);
567 iput(req->r_old_dentry_dir);
568 }
569 kfree(req->r_path1);
570 kfree(req->r_path2);
571 if (req->r_pagelist)
572 ceph_pagelist_release(req->r_pagelist);
573 put_request_session(req);
574 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
575 kfree(req);
576 }
577
578 DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
579
580 /*
581 * lookup session, bump ref if found.
582 *
583 * called under mdsc->mutex.
584 */
585 static struct ceph_mds_request *
586 lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
587 {
588 struct ceph_mds_request *req;
589
590 req = lookup_request(&mdsc->request_tree, tid);
591 if (req)
592 ceph_mdsc_get_request(req);
593
594 return req;
595 }
596
597 /*
598 * Register an in-flight request, and assign a tid. Link to directory
599 * are modifying (if any).
600 *
601 * Called under mdsc->mutex.
602 */
603 static void __register_request(struct ceph_mds_client *mdsc,
604 struct ceph_mds_request *req,
605 struct inode *dir)
606 {
607 int ret = 0;
608
609 req->r_tid = ++mdsc->last_tid;
610 if (req->r_num_caps) {
611 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
612 req->r_num_caps);
613 if (ret < 0) {
614 pr_err("__register_request %p "
615 "failed to reserve caps: %d\n", req, ret);
616 /* set req->r_err to fail early from __do_request */
617 req->r_err = ret;
618 return;
619 }
620 }
621 dout("__register_request %p tid %lld\n", req, req->r_tid);
622 ceph_mdsc_get_request(req);
623 insert_request(&mdsc->request_tree, req);
624
625 req->r_uid = current_fsuid();
626 req->r_gid = current_fsgid();
627
628 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
629 mdsc->oldest_tid = req->r_tid;
630
631 if (dir) {
632 ihold(dir);
633 req->r_unsafe_dir = dir;
634 }
635 }
636
637 static void __unregister_request(struct ceph_mds_client *mdsc,
638 struct ceph_mds_request *req)
639 {
640 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
641
642 /* Never leave an unregistered request on an unsafe list! */
643 list_del_init(&req->r_unsafe_item);
644
645 if (req->r_tid == mdsc->oldest_tid) {
646 struct rb_node *p = rb_next(&req->r_node);
647 mdsc->oldest_tid = 0;
648 while (p) {
649 struct ceph_mds_request *next_req =
650 rb_entry(p, struct ceph_mds_request, r_node);
651 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
652 mdsc->oldest_tid = next_req->r_tid;
653 break;
654 }
655 p = rb_next(p);
656 }
657 }
658
659 erase_request(&mdsc->request_tree, req);
660
661 if (req->r_unsafe_dir &&
662 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
663 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
664 spin_lock(&ci->i_unsafe_lock);
665 list_del_init(&req->r_unsafe_dir_item);
666 spin_unlock(&ci->i_unsafe_lock);
667 }
668 if (req->r_target_inode &&
669 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
670 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
671 spin_lock(&ci->i_unsafe_lock);
672 list_del_init(&req->r_unsafe_target_item);
673 spin_unlock(&ci->i_unsafe_lock);
674 }
675
676 if (req->r_unsafe_dir) {
677 iput(req->r_unsafe_dir);
678 req->r_unsafe_dir = NULL;
679 }
680
681 complete_all(&req->r_safe_completion);
682
683 ceph_mdsc_put_request(req);
684 }
685
686 /*
687 * Walk back up the dentry tree until we hit a dentry representing a
688 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
689 * when calling this) to ensure that the objects won't disappear while we're
690 * working with them. Once we hit a candidate dentry, we attempt to take a
691 * reference to it, and return that as the result.
692 */
693 static struct inode *get_nonsnap_parent(struct dentry *dentry)
694 {
695 struct inode *inode = NULL;
696
697 while (dentry && !IS_ROOT(dentry)) {
698 inode = d_inode_rcu(dentry);
699 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
700 break;
701 dentry = dentry->d_parent;
702 }
703 if (inode)
704 inode = igrab(inode);
705 return inode;
706 }
707
708 /*
709 * Choose mds to send request to next. If there is a hint set in the
710 * request (e.g., due to a prior forward hint from the mds), use that.
711 * Otherwise, consult frag tree and/or caps to identify the
712 * appropriate mds. If all else fails, choose randomly.
713 *
714 * Called under mdsc->mutex.
715 */
716 static int __choose_mds(struct ceph_mds_client *mdsc,
717 struct ceph_mds_request *req)
718 {
719 struct inode *inode;
720 struct ceph_inode_info *ci;
721 struct ceph_cap *cap;
722 int mode = req->r_direct_mode;
723 int mds = -1;
724 u32 hash = req->r_direct_hash;
725 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
726
727 /*
728 * is there a specific mds we should try? ignore hint if we have
729 * no session and the mds is not up (active or recovering).
730 */
731 if (req->r_resend_mds >= 0 &&
732 (__have_session(mdsc, req->r_resend_mds) ||
733 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
734 dout("choose_mds using resend_mds mds%d\n",
735 req->r_resend_mds);
736 return req->r_resend_mds;
737 }
738
739 if (mode == USE_RANDOM_MDS)
740 goto random;
741
742 inode = NULL;
743 if (req->r_inode) {
744 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
745 inode = req->r_inode;
746 ihold(inode);
747 } else {
748 /* req->r_dentry is non-null for LSSNAP request */
749 rcu_read_lock();
750 inode = get_nonsnap_parent(req->r_dentry);
751 rcu_read_unlock();
752 dout("__choose_mds using snapdir's parent %p\n", inode);
753 }
754 } else if (req->r_dentry) {
755 /* ignore race with rename; old or new d_parent is okay */
756 struct dentry *parent;
757 struct inode *dir;
758
759 rcu_read_lock();
760 parent = req->r_dentry->d_parent;
761 dir = req->r_parent ? : d_inode_rcu(parent);
762
763 if (!dir || dir->i_sb != mdsc->fsc->sb) {
764 /* not this fs or parent went negative */
765 inode = d_inode(req->r_dentry);
766 if (inode)
767 ihold(inode);
768 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
769 /* direct snapped/virtual snapdir requests
770 * based on parent dir inode */
771 inode = get_nonsnap_parent(parent);
772 dout("__choose_mds using nonsnap parent %p\n", inode);
773 } else {
774 /* dentry target */
775 inode = d_inode(req->r_dentry);
776 if (!inode || mode == USE_AUTH_MDS) {
777 /* dir + name */
778 inode = igrab(dir);
779 hash = ceph_dentry_hash(dir, req->r_dentry);
780 is_hash = true;
781 } else {
782 ihold(inode);
783 }
784 }
785 rcu_read_unlock();
786 }
787
788 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
789 (int)hash, mode);
790 if (!inode)
791 goto random;
792 ci = ceph_inode(inode);
793
794 if (is_hash && S_ISDIR(inode->i_mode)) {
795 struct ceph_inode_frag frag;
796 int found;
797
798 ceph_choose_frag(ci, hash, &frag, &found);
799 if (found) {
800 if (mode == USE_ANY_MDS && frag.ndist > 0) {
801 u8 r;
802
803 /* choose a random replica */
804 get_random_bytes(&r, 1);
805 r %= frag.ndist;
806 mds = frag.dist[r];
807 dout("choose_mds %p %llx.%llx "
808 "frag %u mds%d (%d/%d)\n",
809 inode, ceph_vinop(inode),
810 frag.frag, mds,
811 (int)r, frag.ndist);
812 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
813 CEPH_MDS_STATE_ACTIVE)
814 goto out;
815 }
816
817 /* since this file/dir wasn't known to be
818 * replicated, then we want to look for the
819 * authoritative mds. */
820 mode = USE_AUTH_MDS;
821 if (frag.mds >= 0) {
822 /* choose auth mds */
823 mds = frag.mds;
824 dout("choose_mds %p %llx.%llx "
825 "frag %u mds%d (auth)\n",
826 inode, ceph_vinop(inode), frag.frag, mds);
827 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
828 CEPH_MDS_STATE_ACTIVE)
829 goto out;
830 }
831 }
832 }
833
834 spin_lock(&ci->i_ceph_lock);
835 cap = NULL;
836 if (mode == USE_AUTH_MDS)
837 cap = ci->i_auth_cap;
838 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
839 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
840 if (!cap) {
841 spin_unlock(&ci->i_ceph_lock);
842 iput(inode);
843 goto random;
844 }
845 mds = cap->session->s_mds;
846 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
847 inode, ceph_vinop(inode), mds,
848 cap == ci->i_auth_cap ? "auth " : "", cap);
849 spin_unlock(&ci->i_ceph_lock);
850 out:
851 iput(inode);
852 return mds;
853
854 random:
855 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
856 dout("choose_mds chose random mds%d\n", mds);
857 return mds;
858 }
859
860
861 /*
862 * session messages
863 */
864 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
865 {
866 struct ceph_msg *msg;
867 struct ceph_mds_session_head *h;
868
869 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
870 false);
871 if (!msg) {
872 pr_err("create_session_msg ENOMEM creating msg\n");
873 return NULL;
874 }
875 h = msg->front.iov_base;
876 h->op = cpu_to_le32(op);
877 h->seq = cpu_to_le64(seq);
878
879 return msg;
880 }
881
882 /*
883 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
884 * to include additional client metadata fields.
885 */
886 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
887 {
888 struct ceph_msg *msg;
889 struct ceph_mds_session_head *h;
890 int i = -1;
891 int metadata_bytes = 0;
892 int metadata_key_count = 0;
893 struct ceph_options *opt = mdsc->fsc->client->options;
894 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
895 void *p;
896
897 const char* metadata[][2] = {
898 {"hostname", mdsc->nodename},
899 {"kernel_version", init_utsname()->release},
900 {"entity_id", opt->name ? : ""},
901 {"root", fsopt->server_path ? : "/"},
902 {NULL, NULL}
903 };
904
905 /* Calculate serialized length of metadata */
906 metadata_bytes = 4; /* map length */
907 for (i = 0; metadata[i][0]; ++i) {
908 metadata_bytes += 8 + strlen(metadata[i][0]) +
909 strlen(metadata[i][1]);
910 metadata_key_count++;
911 }
912
913 /* Allocate the message */
914 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
915 GFP_NOFS, false);
916 if (!msg) {
917 pr_err("create_session_msg ENOMEM creating msg\n");
918 return NULL;
919 }
920 h = msg->front.iov_base;
921 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
922 h->seq = cpu_to_le64(seq);
923
924 /*
925 * Serialize client metadata into waiting buffer space, using
926 * the format that userspace expects for map<string, string>
927 *
928 * ClientSession messages with metadata are v2
929 */
930 msg->hdr.version = cpu_to_le16(2);
931 msg->hdr.compat_version = cpu_to_le16(1);
932
933 /* The write pointer, following the session_head structure */
934 p = msg->front.iov_base + sizeof(*h);
935
936 /* Number of entries in the map */
937 ceph_encode_32(&p, metadata_key_count);
938
939 /* Two length-prefixed strings for each entry in the map */
940 for (i = 0; metadata[i][0]; ++i) {
941 size_t const key_len = strlen(metadata[i][0]);
942 size_t const val_len = strlen(metadata[i][1]);
943
944 ceph_encode_32(&p, key_len);
945 memcpy(p, metadata[i][0], key_len);
946 p += key_len;
947 ceph_encode_32(&p, val_len);
948 memcpy(p, metadata[i][1], val_len);
949 p += val_len;
950 }
951
952 return msg;
953 }
954
955 /*
956 * send session open request.
957 *
958 * called under mdsc->mutex
959 */
960 static int __open_session(struct ceph_mds_client *mdsc,
961 struct ceph_mds_session *session)
962 {
963 struct ceph_msg *msg;
964 int mstate;
965 int mds = session->s_mds;
966
967 /* wait for mds to go active? */
968 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
969 dout("open_session to mds%d (%s)\n", mds,
970 ceph_mds_state_name(mstate));
971 session->s_state = CEPH_MDS_SESSION_OPENING;
972 session->s_renew_requested = jiffies;
973
974 /* send connect message */
975 msg = create_session_open_msg(mdsc, session->s_seq);
976 if (!msg)
977 return -ENOMEM;
978 ceph_con_send(&session->s_con, msg);
979 return 0;
980 }
981
982 /*
983 * open sessions for any export targets for the given mds
984 *
985 * called under mdsc->mutex
986 */
987 static struct ceph_mds_session *
988 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
989 {
990 struct ceph_mds_session *session;
991
992 session = __ceph_lookup_mds_session(mdsc, target);
993 if (!session) {
994 session = register_session(mdsc, target);
995 if (IS_ERR(session))
996 return session;
997 }
998 if (session->s_state == CEPH_MDS_SESSION_NEW ||
999 session->s_state == CEPH_MDS_SESSION_CLOSING)
1000 __open_session(mdsc, session);
1001
1002 return session;
1003 }
1004
1005 struct ceph_mds_session *
1006 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1007 {
1008 struct ceph_mds_session *session;
1009
1010 dout("open_export_target_session to mds%d\n", target);
1011
1012 mutex_lock(&mdsc->mutex);
1013 session = __open_export_target_session(mdsc, target);
1014 mutex_unlock(&mdsc->mutex);
1015
1016 return session;
1017 }
1018
1019 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1020 struct ceph_mds_session *session)
1021 {
1022 struct ceph_mds_info *mi;
1023 struct ceph_mds_session *ts;
1024 int i, mds = session->s_mds;
1025
1026 if (mds >= mdsc->mdsmap->m_num_mds)
1027 return;
1028
1029 mi = &mdsc->mdsmap->m_info[mds];
1030 dout("open_export_target_sessions for mds%d (%d targets)\n",
1031 session->s_mds, mi->num_export_targets);
1032
1033 for (i = 0; i < mi->num_export_targets; i++) {
1034 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1035 if (!IS_ERR(ts))
1036 ceph_put_mds_session(ts);
1037 }
1038 }
1039
1040 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1041 struct ceph_mds_session *session)
1042 {
1043 mutex_lock(&mdsc->mutex);
1044 __open_export_target_sessions(mdsc, session);
1045 mutex_unlock(&mdsc->mutex);
1046 }
1047
1048 /*
1049 * session caps
1050 */
1051
1052 static void detach_cap_releases(struct ceph_mds_session *session,
1053 struct list_head *target)
1054 {
1055 lockdep_assert_held(&session->s_cap_lock);
1056
1057 list_splice_init(&session->s_cap_releases, target);
1058 session->s_num_cap_releases = 0;
1059 dout("dispose_cap_releases mds%d\n", session->s_mds);
1060 }
1061
1062 static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1063 struct list_head *dispose)
1064 {
1065 while (!list_empty(dispose)) {
1066 struct ceph_cap *cap;
1067 /* zero out the in-progress message */
1068 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
1069 list_del(&cap->session_caps);
1070 ceph_put_cap(mdsc, cap);
1071 }
1072 }
1073
1074 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1075 struct ceph_mds_session *session)
1076 {
1077 struct ceph_mds_request *req;
1078 struct rb_node *p;
1079
1080 dout("cleanup_session_requests mds%d\n", session->s_mds);
1081 mutex_lock(&mdsc->mutex);
1082 while (!list_empty(&session->s_unsafe)) {
1083 req = list_first_entry(&session->s_unsafe,
1084 struct ceph_mds_request, r_unsafe_item);
1085 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1086 req->r_tid);
1087 __unregister_request(mdsc, req);
1088 }
1089 /* zero r_attempts, so kick_requests() will re-send requests */
1090 p = rb_first(&mdsc->request_tree);
1091 while (p) {
1092 req = rb_entry(p, struct ceph_mds_request, r_node);
1093 p = rb_next(p);
1094 if (req->r_session &&
1095 req->r_session->s_mds == session->s_mds)
1096 req->r_attempts = 0;
1097 }
1098 mutex_unlock(&mdsc->mutex);
1099 }
1100
1101 /*
1102 * Helper to safely iterate over all caps associated with a session, with
1103 * special care taken to handle a racing __ceph_remove_cap().
1104 *
1105 * Caller must hold session s_mutex.
1106 */
1107 static int iterate_session_caps(struct ceph_mds_session *session,
1108 int (*cb)(struct inode *, struct ceph_cap *,
1109 void *), void *arg)
1110 {
1111 struct list_head *p;
1112 struct ceph_cap *cap;
1113 struct inode *inode, *last_inode = NULL;
1114 struct ceph_cap *old_cap = NULL;
1115 int ret;
1116
1117 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1118 spin_lock(&session->s_cap_lock);
1119 p = session->s_caps.next;
1120 while (p != &session->s_caps) {
1121 cap = list_entry(p, struct ceph_cap, session_caps);
1122 inode = igrab(&cap->ci->vfs_inode);
1123 if (!inode) {
1124 p = p->next;
1125 continue;
1126 }
1127 session->s_cap_iterator = cap;
1128 spin_unlock(&session->s_cap_lock);
1129
1130 if (last_inode) {
1131 iput(last_inode);
1132 last_inode = NULL;
1133 }
1134 if (old_cap) {
1135 ceph_put_cap(session->s_mdsc, old_cap);
1136 old_cap = NULL;
1137 }
1138
1139 ret = cb(inode, cap, arg);
1140 last_inode = inode;
1141
1142 spin_lock(&session->s_cap_lock);
1143 p = p->next;
1144 if (!cap->ci) {
1145 dout("iterate_session_caps finishing cap %p removal\n",
1146 cap);
1147 BUG_ON(cap->session != session);
1148 cap->session = NULL;
1149 list_del_init(&cap->session_caps);
1150 session->s_nr_caps--;
1151 if (cap->queue_release) {
1152 list_add_tail(&cap->session_caps,
1153 &session->s_cap_releases);
1154 session->s_num_cap_releases++;
1155 } else {
1156 old_cap = cap; /* put_cap it w/o locks held */
1157 }
1158 }
1159 if (ret < 0)
1160 goto out;
1161 }
1162 ret = 0;
1163 out:
1164 session->s_cap_iterator = NULL;
1165 spin_unlock(&session->s_cap_lock);
1166
1167 iput(last_inode);
1168 if (old_cap)
1169 ceph_put_cap(session->s_mdsc, old_cap);
1170
1171 return ret;
1172 }
1173
1174 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1175 void *arg)
1176 {
1177 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
1178 struct ceph_inode_info *ci = ceph_inode(inode);
1179 LIST_HEAD(to_remove);
1180 bool drop = false;
1181 bool invalidate = false;
1182
1183 dout("removing cap %p, ci is %p, inode is %p\n",
1184 cap, ci, &ci->vfs_inode);
1185 spin_lock(&ci->i_ceph_lock);
1186 __ceph_remove_cap(cap, false);
1187 if (!ci->i_auth_cap) {
1188 struct ceph_cap_flush *cf;
1189 struct ceph_mds_client *mdsc = fsc->mdsc;
1190
1191 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1192
1193 if (ci->i_wrbuffer_ref > 0 &&
1194 READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
1195 invalidate = true;
1196
1197 while (!list_empty(&ci->i_cap_flush_list)) {
1198 cf = list_first_entry(&ci->i_cap_flush_list,
1199 struct ceph_cap_flush, i_list);
1200 list_move(&cf->i_list, &to_remove);
1201 }
1202
1203 spin_lock(&mdsc->cap_dirty_lock);
1204
1205 list_for_each_entry(cf, &to_remove, i_list)
1206 list_del(&cf->g_list);
1207
1208 if (!list_empty(&ci->i_dirty_item)) {
1209 pr_warn_ratelimited(
1210 " dropping dirty %s state for %p %lld\n",
1211 ceph_cap_string(ci->i_dirty_caps),
1212 inode, ceph_ino(inode));
1213 ci->i_dirty_caps = 0;
1214 list_del_init(&ci->i_dirty_item);
1215 drop = true;
1216 }
1217 if (!list_empty(&ci->i_flushing_item)) {
1218 pr_warn_ratelimited(
1219 " dropping dirty+flushing %s state for %p %lld\n",
1220 ceph_cap_string(ci->i_flushing_caps),
1221 inode, ceph_ino(inode));
1222 ci->i_flushing_caps = 0;
1223 list_del_init(&ci->i_flushing_item);
1224 mdsc->num_cap_flushing--;
1225 drop = true;
1226 }
1227 spin_unlock(&mdsc->cap_dirty_lock);
1228
1229 if (atomic_read(&ci->i_filelock_ref) > 0) {
1230 /* make further file lock syscall return -EIO */
1231 ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
1232 pr_warn_ratelimited(" dropping file locks for %p %lld\n",
1233 inode, ceph_ino(inode));
1234 }
1235
1236 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1237 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
1238 ci->i_prealloc_cap_flush = NULL;
1239 }
1240 }
1241 spin_unlock(&ci->i_ceph_lock);
1242 while (!list_empty(&to_remove)) {
1243 struct ceph_cap_flush *cf;
1244 cf = list_first_entry(&to_remove,
1245 struct ceph_cap_flush, i_list);
1246 list_del(&cf->i_list);
1247 ceph_free_cap_flush(cf);
1248 }
1249
1250 wake_up_all(&ci->i_cap_wq);
1251 if (invalidate)
1252 ceph_queue_invalidate(inode);
1253 if (drop)
1254 iput(inode);
1255 return 0;
1256 }
1257
1258 /*
1259 * caller must hold session s_mutex
1260 */
1261 static void remove_session_caps(struct ceph_mds_session *session)
1262 {
1263 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1264 struct super_block *sb = fsc->sb;
1265 LIST_HEAD(dispose);
1266
1267 dout("remove_session_caps on %p\n", session);
1268 iterate_session_caps(session, remove_session_caps_cb, fsc);
1269
1270 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1271
1272 spin_lock(&session->s_cap_lock);
1273 if (session->s_nr_caps > 0) {
1274 struct inode *inode;
1275 struct ceph_cap *cap, *prev = NULL;
1276 struct ceph_vino vino;
1277 /*
1278 * iterate_session_caps() skips inodes that are being
1279 * deleted, we need to wait until deletions are complete.
1280 * __wait_on_freeing_inode() is designed for the job,
1281 * but it is not exported, so use lookup inode function
1282 * to access it.
1283 */
1284 while (!list_empty(&session->s_caps)) {
1285 cap = list_entry(session->s_caps.next,
1286 struct ceph_cap, session_caps);
1287 if (cap == prev)
1288 break;
1289 prev = cap;
1290 vino = cap->ci->i_vino;
1291 spin_unlock(&session->s_cap_lock);
1292
1293 inode = ceph_find_inode(sb, vino);
1294 iput(inode);
1295
1296 spin_lock(&session->s_cap_lock);
1297 }
1298 }
1299
1300 // drop cap expires and unlock s_cap_lock
1301 detach_cap_releases(session, &dispose);
1302
1303 BUG_ON(session->s_nr_caps > 0);
1304 BUG_ON(!list_empty(&session->s_cap_flushing));
1305 spin_unlock(&session->s_cap_lock);
1306 dispose_cap_releases(session->s_mdsc, &dispose);
1307 }
1308
1309 /*
1310 * wake up any threads waiting on this session's caps. if the cap is
1311 * old (didn't get renewed on the client reconnect), remove it now.
1312 *
1313 * caller must hold s_mutex.
1314 */
1315 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1316 void *arg)
1317 {
1318 struct ceph_inode_info *ci = ceph_inode(inode);
1319
1320 if (arg) {
1321 spin_lock(&ci->i_ceph_lock);
1322 ci->i_wanted_max_size = 0;
1323 ci->i_requested_max_size = 0;
1324 spin_unlock(&ci->i_ceph_lock);
1325 }
1326 wake_up_all(&ci->i_cap_wq);
1327 return 0;
1328 }
1329
1330 static void wake_up_session_caps(struct ceph_mds_session *session,
1331 int reconnect)
1332 {
1333 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1334 iterate_session_caps(session, wake_up_session_cb,
1335 (void *)(unsigned long)reconnect);
1336 }
1337
1338 /*
1339 * Send periodic message to MDS renewing all currently held caps. The
1340 * ack will reset the expiration for all caps from this session.
1341 *
1342 * caller holds s_mutex
1343 */
1344 static int send_renew_caps(struct ceph_mds_client *mdsc,
1345 struct ceph_mds_session *session)
1346 {
1347 struct ceph_msg *msg;
1348 int state;
1349
1350 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1351 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1352 pr_info("mds%d caps stale\n", session->s_mds);
1353 session->s_renew_requested = jiffies;
1354
1355 /* do not try to renew caps until a recovering mds has reconnected
1356 * with its clients. */
1357 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1358 if (state < CEPH_MDS_STATE_RECONNECT) {
1359 dout("send_renew_caps ignoring mds%d (%s)\n",
1360 session->s_mds, ceph_mds_state_name(state));
1361 return 0;
1362 }
1363
1364 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1365 ceph_mds_state_name(state));
1366 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1367 ++session->s_renew_seq);
1368 if (!msg)
1369 return -ENOMEM;
1370 ceph_con_send(&session->s_con, msg);
1371 return 0;
1372 }
1373
1374 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1375 struct ceph_mds_session *session, u64 seq)
1376 {
1377 struct ceph_msg *msg;
1378
1379 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1380 session->s_mds, ceph_session_state_name(session->s_state), seq);
1381 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1382 if (!msg)
1383 return -ENOMEM;
1384 ceph_con_send(&session->s_con, msg);
1385 return 0;
1386 }
1387
1388
1389 /*
1390 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1391 *
1392 * Called under session->s_mutex
1393 */
1394 static void renewed_caps(struct ceph_mds_client *mdsc,
1395 struct ceph_mds_session *session, int is_renew)
1396 {
1397 int was_stale;
1398 int wake = 0;
1399
1400 spin_lock(&session->s_cap_lock);
1401 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1402
1403 session->s_cap_ttl = session->s_renew_requested +
1404 mdsc->mdsmap->m_session_timeout*HZ;
1405
1406 if (was_stale) {
1407 if (time_before(jiffies, session->s_cap_ttl)) {
1408 pr_info("mds%d caps renewed\n", session->s_mds);
1409 wake = 1;
1410 } else {
1411 pr_info("mds%d caps still stale\n", session->s_mds);
1412 }
1413 }
1414 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1415 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1416 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1417 spin_unlock(&session->s_cap_lock);
1418
1419 if (wake)
1420 wake_up_session_caps(session, 0);
1421 }
1422
1423 /*
1424 * send a session close request
1425 */
1426 static int request_close_session(struct ceph_mds_client *mdsc,
1427 struct ceph_mds_session *session)
1428 {
1429 struct ceph_msg *msg;
1430
1431 dout("request_close_session mds%d state %s seq %lld\n",
1432 session->s_mds, ceph_session_state_name(session->s_state),
1433 session->s_seq);
1434 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1435 if (!msg)
1436 return -ENOMEM;
1437 ceph_con_send(&session->s_con, msg);
1438 return 1;
1439 }
1440
1441 /*
1442 * Called with s_mutex held.
1443 */
1444 static int __close_session(struct ceph_mds_client *mdsc,
1445 struct ceph_mds_session *session)
1446 {
1447 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1448 return 0;
1449 session->s_state = CEPH_MDS_SESSION_CLOSING;
1450 return request_close_session(mdsc, session);
1451 }
1452
1453 static bool drop_negative_children(struct dentry *dentry)
1454 {
1455 struct dentry *child;
1456 bool all_negative = true;
1457
1458 if (!d_is_dir(dentry))
1459 goto out;
1460
1461 spin_lock(&dentry->d_lock);
1462 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
1463 if (d_really_is_positive(child)) {
1464 all_negative = false;
1465 break;
1466 }
1467 }
1468 spin_unlock(&dentry->d_lock);
1469
1470 if (all_negative)
1471 shrink_dcache_parent(dentry);
1472 out:
1473 return all_negative;
1474 }
1475
1476 /*
1477 * Trim old(er) caps.
1478 *
1479 * Because we can't cache an inode without one or more caps, we do
1480 * this indirectly: if a cap is unused, we prune its aliases, at which
1481 * point the inode will hopefully get dropped to.
1482 *
1483 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1484 * memory pressure from the MDS, though, so it needn't be perfect.
1485 */
1486 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1487 {
1488 struct ceph_mds_session *session = arg;
1489 struct ceph_inode_info *ci = ceph_inode(inode);
1490 int used, wanted, oissued, mine;
1491
1492 if (session->s_trim_caps <= 0)
1493 return -1;
1494
1495 spin_lock(&ci->i_ceph_lock);
1496 mine = cap->issued | cap->implemented;
1497 used = __ceph_caps_used(ci);
1498 wanted = __ceph_caps_file_wanted(ci);
1499 oissued = __ceph_caps_issued_other(ci, cap);
1500
1501 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1502 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1503 ceph_cap_string(used), ceph_cap_string(wanted));
1504 if (cap == ci->i_auth_cap) {
1505 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1506 !list_empty(&ci->i_cap_snaps))
1507 goto out;
1508 if ((used | wanted) & CEPH_CAP_ANY_WR)
1509 goto out;
1510 /* Note: it's possible that i_filelock_ref becomes non-zero
1511 * after dropping auth caps. It doesn't hurt because reply
1512 * of lock mds request will re-add auth caps. */
1513 if (atomic_read(&ci->i_filelock_ref) > 0)
1514 goto out;
1515 }
1516 /* The inode has cached pages, but it's no longer used.
1517 * we can safely drop it */
1518 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1519 !(oissued & CEPH_CAP_FILE_CACHE)) {
1520 used = 0;
1521 oissued = 0;
1522 }
1523 if ((used | wanted) & ~oissued & mine)
1524 goto out; /* we need these caps */
1525
1526 if (oissued) {
1527 /* we aren't the only cap.. just remove us */
1528 __ceph_remove_cap(cap, true);
1529 session->s_trim_caps--;
1530 } else {
1531 struct dentry *dentry;
1532 /* try dropping referring dentries */
1533 spin_unlock(&ci->i_ceph_lock);
1534 dentry = d_find_any_alias(inode);
1535 if (dentry && drop_negative_children(dentry)) {
1536 int count;
1537 dput(dentry);
1538 d_prune_aliases(inode);
1539 count = atomic_read(&inode->i_count);
1540 if (count == 1)
1541 session->s_trim_caps--;
1542 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1543 inode, cap, count);
1544 } else {
1545 dput(dentry);
1546 }
1547 return 0;
1548 }
1549
1550 out:
1551 spin_unlock(&ci->i_ceph_lock);
1552 return 0;
1553 }
1554
1555 /*
1556 * Trim session cap count down to some max number.
1557 */
1558 int ceph_trim_caps(struct ceph_mds_client *mdsc,
1559 struct ceph_mds_session *session,
1560 int max_caps)
1561 {
1562 int trim_caps = session->s_nr_caps - max_caps;
1563
1564 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1565 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1566 if (trim_caps > 0) {
1567 session->s_trim_caps = trim_caps;
1568 iterate_session_caps(session, trim_caps_cb, session);
1569 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1570 session->s_mds, session->s_nr_caps, max_caps,
1571 trim_caps - session->s_trim_caps);
1572 session->s_trim_caps = 0;
1573 }
1574
1575 ceph_send_cap_releases(mdsc, session);
1576 return 0;
1577 }
1578
1579 static int check_caps_flush(struct ceph_mds_client *mdsc,
1580 u64 want_flush_tid)
1581 {
1582 int ret = 1;
1583
1584 spin_lock(&mdsc->cap_dirty_lock);
1585 if (!list_empty(&mdsc->cap_flush_list)) {
1586 struct ceph_cap_flush *cf =
1587 list_first_entry(&mdsc->cap_flush_list,
1588 struct ceph_cap_flush, g_list);
1589 if (cf->tid <= want_flush_tid) {
1590 dout("check_caps_flush still flushing tid "
1591 "%llu <= %llu\n", cf->tid, want_flush_tid);
1592 ret = 0;
1593 }
1594 }
1595 spin_unlock(&mdsc->cap_dirty_lock);
1596 return ret;
1597 }
1598
1599 /*
1600 * flush all dirty inode data to disk.
1601 *
1602 * returns true if we've flushed through want_flush_tid
1603 */
1604 static void wait_caps_flush(struct ceph_mds_client *mdsc,
1605 u64 want_flush_tid)
1606 {
1607 dout("check_caps_flush want %llu\n", want_flush_tid);
1608
1609 wait_event(mdsc->cap_flushing_wq,
1610 check_caps_flush(mdsc, want_flush_tid));
1611
1612 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
1613 }
1614
1615 /*
1616 * called under s_mutex
1617 */
1618 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1619 struct ceph_mds_session *session)
1620 {
1621 struct ceph_msg *msg = NULL;
1622 struct ceph_mds_cap_release *head;
1623 struct ceph_mds_cap_item *item;
1624 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
1625 struct ceph_cap *cap;
1626 LIST_HEAD(tmp_list);
1627 int num_cap_releases;
1628 __le32 barrier, *cap_barrier;
1629
1630 down_read(&osdc->lock);
1631 barrier = cpu_to_le32(osdc->epoch_barrier);
1632 up_read(&osdc->lock);
1633
1634 spin_lock(&session->s_cap_lock);
1635 again:
1636 list_splice_init(&session->s_cap_releases, &tmp_list);
1637 num_cap_releases = session->s_num_cap_releases;
1638 session->s_num_cap_releases = 0;
1639 spin_unlock(&session->s_cap_lock);
1640
1641 while (!list_empty(&tmp_list)) {
1642 if (!msg) {
1643 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1644 PAGE_SIZE, GFP_NOFS, false);
1645 if (!msg)
1646 goto out_err;
1647 head = msg->front.iov_base;
1648 head->num = cpu_to_le32(0);
1649 msg->front.iov_len = sizeof(*head);
1650
1651 msg->hdr.version = cpu_to_le16(2);
1652 msg->hdr.compat_version = cpu_to_le16(1);
1653 }
1654
1655 cap = list_first_entry(&tmp_list, struct ceph_cap,
1656 session_caps);
1657 list_del(&cap->session_caps);
1658 num_cap_releases--;
1659
1660 head = msg->front.iov_base;
1661 le32_add_cpu(&head->num, 1);
1662 item = msg->front.iov_base + msg->front.iov_len;
1663 item->ino = cpu_to_le64(cap->cap_ino);
1664 item->cap_id = cpu_to_le64(cap->cap_id);
1665 item->migrate_seq = cpu_to_le32(cap->mseq);
1666 item->seq = cpu_to_le32(cap->issue_seq);
1667 msg->front.iov_len += sizeof(*item);
1668
1669 ceph_put_cap(mdsc, cap);
1670
1671 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1672 // Append cap_barrier field
1673 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1674 *cap_barrier = barrier;
1675 msg->front.iov_len += sizeof(*cap_barrier);
1676
1677 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1678 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1679 ceph_con_send(&session->s_con, msg);
1680 msg = NULL;
1681 }
1682 }
1683
1684 BUG_ON(num_cap_releases != 0);
1685
1686 spin_lock(&session->s_cap_lock);
1687 if (!list_empty(&session->s_cap_releases))
1688 goto again;
1689 spin_unlock(&session->s_cap_lock);
1690
1691 if (msg) {
1692 // Append cap_barrier field
1693 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1694 *cap_barrier = barrier;
1695 msg->front.iov_len += sizeof(*cap_barrier);
1696
1697 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1698 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1699 ceph_con_send(&session->s_con, msg);
1700 }
1701 return;
1702 out_err:
1703 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1704 session->s_mds);
1705 spin_lock(&session->s_cap_lock);
1706 list_splice(&tmp_list, &session->s_cap_releases);
1707 session->s_num_cap_releases += num_cap_releases;
1708 spin_unlock(&session->s_cap_lock);
1709 }
1710
1711 /*
1712 * requests
1713 */
1714
1715 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1716 struct inode *dir)
1717 {
1718 struct ceph_inode_info *ci = ceph_inode(dir);
1719 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1720 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1721 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
1722 int order, num_entries;
1723
1724 spin_lock(&ci->i_ceph_lock);
1725 num_entries = ci->i_files + ci->i_subdirs;
1726 spin_unlock(&ci->i_ceph_lock);
1727 num_entries = max(num_entries, 1);
1728 num_entries = min(num_entries, opt->max_readdir);
1729
1730 order = get_order(size * num_entries);
1731 while (order >= 0) {
1732 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
1733 __GFP_NOWARN,
1734 order);
1735 if (rinfo->dir_entries)
1736 break;
1737 order--;
1738 }
1739 if (!rinfo->dir_entries)
1740 return -ENOMEM;
1741
1742 num_entries = (PAGE_SIZE << order) / size;
1743 num_entries = min(num_entries, opt->max_readdir);
1744
1745 rinfo->dir_buf_size = PAGE_SIZE << order;
1746 req->r_num_caps = num_entries + 1;
1747 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1748 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1749 return 0;
1750 }
1751
1752 /*
1753 * Create an mds request.
1754 */
1755 struct ceph_mds_request *
1756 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1757 {
1758 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1759
1760 if (!req)
1761 return ERR_PTR(-ENOMEM);
1762
1763 mutex_init(&req->r_fill_mutex);
1764 req->r_mdsc = mdsc;
1765 req->r_started = jiffies;
1766 req->r_resend_mds = -1;
1767 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1768 INIT_LIST_HEAD(&req->r_unsafe_target_item);
1769 req->r_fmode = -1;
1770 kref_init(&req->r_kref);
1771 RB_CLEAR_NODE(&req->r_node);
1772 INIT_LIST_HEAD(&req->r_wait);
1773 init_completion(&req->r_completion);
1774 init_completion(&req->r_safe_completion);
1775 INIT_LIST_HEAD(&req->r_unsafe_item);
1776
1777 req->r_stamp = timespec_trunc(current_kernel_time(), mdsc->fsc->sb->s_time_gran);
1778
1779 req->r_op = op;
1780 req->r_direct_mode = mode;
1781 return req;
1782 }
1783
1784 /*
1785 * return oldest (lowest) request, tid in request tree, 0 if none.
1786 *
1787 * called under mdsc->mutex.
1788 */
1789 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1790 {
1791 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1792 return NULL;
1793 return rb_entry(rb_first(&mdsc->request_tree),
1794 struct ceph_mds_request, r_node);
1795 }
1796
1797 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1798 {
1799 return mdsc->oldest_tid;
1800 }
1801
1802 /*
1803 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1804 * on build_path_from_dentry in fs/cifs/dir.c.
1805 *
1806 * If @stop_on_nosnap, generate path relative to the first non-snapped
1807 * inode.
1808 *
1809 * Encode hidden .snap dirs as a double /, i.e.
1810 * foo/.snap/bar -> foo//bar
1811 */
1812 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1813 int stop_on_nosnap)
1814 {
1815 struct dentry *temp;
1816 char *path;
1817 int len, pos;
1818 unsigned seq;
1819
1820 if (!dentry)
1821 return ERR_PTR(-EINVAL);
1822
1823 retry:
1824 len = 0;
1825 seq = read_seqbegin(&rename_lock);
1826 rcu_read_lock();
1827 for (temp = dentry; !IS_ROOT(temp);) {
1828 struct inode *inode = d_inode(temp);
1829 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1830 len++; /* slash only */
1831 else if (stop_on_nosnap && inode &&
1832 ceph_snap(inode) == CEPH_NOSNAP)
1833 break;
1834 else
1835 len += 1 + temp->d_name.len;
1836 temp = temp->d_parent;
1837 }
1838 rcu_read_unlock();
1839 if (len)
1840 len--; /* no leading '/' */
1841
1842 path = kmalloc(len+1, GFP_NOFS);
1843 if (!path)
1844 return ERR_PTR(-ENOMEM);
1845 pos = len;
1846 path[pos] = 0; /* trailing null */
1847 rcu_read_lock();
1848 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1849 struct inode *inode;
1850
1851 spin_lock(&temp->d_lock);
1852 inode = d_inode(temp);
1853 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1854 dout("build_path path+%d: %p SNAPDIR\n",
1855 pos, temp);
1856 } else if (stop_on_nosnap && inode &&
1857 ceph_snap(inode) == CEPH_NOSNAP) {
1858 spin_unlock(&temp->d_lock);
1859 break;
1860 } else {
1861 pos -= temp->d_name.len;
1862 if (pos < 0) {
1863 spin_unlock(&temp->d_lock);
1864 break;
1865 }
1866 strncpy(path + pos, temp->d_name.name,
1867 temp->d_name.len);
1868 }
1869 spin_unlock(&temp->d_lock);
1870 if (pos)
1871 path[--pos] = '/';
1872 temp = temp->d_parent;
1873 }
1874 rcu_read_unlock();
1875 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1876 pr_err("build_path did not end path lookup where "
1877 "expected, namelen is %d, pos is %d\n", len, pos);
1878 /* presumably this is only possible if racing with a
1879 rename of one of the parent directories (we can not
1880 lock the dentries above us to prevent this, but
1881 retrying should be harmless) */
1882 kfree(path);
1883 goto retry;
1884 }
1885
1886 *base = ceph_ino(d_inode(temp));
1887 *plen = len;
1888 dout("build_path on %p %d built %llx '%.*s'\n",
1889 dentry, d_count(dentry), *base, len, path);
1890 return path;
1891 }
1892
1893 static int build_dentry_path(struct dentry *dentry, struct inode *dir,
1894 const char **ppath, int *ppathlen, u64 *pino,
1895 int *pfreepath)
1896 {
1897 char *path;
1898
1899 rcu_read_lock();
1900 if (!dir)
1901 dir = d_inode_rcu(dentry->d_parent);
1902 if (dir && ceph_snap(dir) == CEPH_NOSNAP) {
1903 *pino = ceph_ino(dir);
1904 rcu_read_unlock();
1905 *ppath = dentry->d_name.name;
1906 *ppathlen = dentry->d_name.len;
1907 return 0;
1908 }
1909 rcu_read_unlock();
1910 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1911 if (IS_ERR(path))
1912 return PTR_ERR(path);
1913 *ppath = path;
1914 *pfreepath = 1;
1915 return 0;
1916 }
1917
1918 static int build_inode_path(struct inode *inode,
1919 const char **ppath, int *ppathlen, u64 *pino,
1920 int *pfreepath)
1921 {
1922 struct dentry *dentry;
1923 char *path;
1924
1925 if (ceph_snap(inode) == CEPH_NOSNAP) {
1926 *pino = ceph_ino(inode);
1927 *ppathlen = 0;
1928 return 0;
1929 }
1930 dentry = d_find_alias(inode);
1931 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1932 dput(dentry);
1933 if (IS_ERR(path))
1934 return PTR_ERR(path);
1935 *ppath = path;
1936 *pfreepath = 1;
1937 return 0;
1938 }
1939
1940 /*
1941 * request arguments may be specified via an inode *, a dentry *, or
1942 * an explicit ino+path.
1943 */
1944 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1945 struct inode *rdiri, const char *rpath,
1946 u64 rino, const char **ppath, int *pathlen,
1947 u64 *ino, int *freepath)
1948 {
1949 int r = 0;
1950
1951 if (rinode) {
1952 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1953 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1954 ceph_snap(rinode));
1955 } else if (rdentry) {
1956 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
1957 freepath);
1958 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1959 *ppath);
1960 } else if (rpath || rino) {
1961 *ino = rino;
1962 *ppath = rpath;
1963 *pathlen = rpath ? strlen(rpath) : 0;
1964 dout(" path %.*s\n", *pathlen, rpath);
1965 }
1966
1967 return r;
1968 }
1969
1970 /*
1971 * called under mdsc->mutex
1972 */
1973 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1974 struct ceph_mds_request *req,
1975 int mds, bool drop_cap_releases)
1976 {
1977 struct ceph_msg *msg;
1978 struct ceph_mds_request_head *head;
1979 const char *path1 = NULL;
1980 const char *path2 = NULL;
1981 u64 ino1 = 0, ino2 = 0;
1982 int pathlen1 = 0, pathlen2 = 0;
1983 int freepath1 = 0, freepath2 = 0;
1984 int len;
1985 u16 releases;
1986 void *p, *end;
1987 int ret;
1988
1989 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1990 req->r_parent, req->r_path1, req->r_ino1.ino,
1991 &path1, &pathlen1, &ino1, &freepath1);
1992 if (ret < 0) {
1993 msg = ERR_PTR(ret);
1994 goto out;
1995 }
1996
1997 ret = set_request_path_attr(NULL, req->r_old_dentry,
1998 req->r_old_dentry_dir,
1999 req->r_path2, req->r_ino2.ino,
2000 &path2, &pathlen2, &ino2, &freepath2);
2001 if (ret < 0) {
2002 msg = ERR_PTR(ret);
2003 goto out_free1;
2004 }
2005
2006 len = sizeof(*head) +
2007 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
2008 sizeof(struct ceph_timespec);
2009
2010 /* calculate (max) length for cap releases */
2011 len += sizeof(struct ceph_mds_request_release) *
2012 (!!req->r_inode_drop + !!req->r_dentry_drop +
2013 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
2014 if (req->r_dentry_drop)
2015 len += req->r_dentry->d_name.len;
2016 if (req->r_old_dentry_drop)
2017 len += req->r_old_dentry->d_name.len;
2018
2019 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
2020 if (!msg) {
2021 msg = ERR_PTR(-ENOMEM);
2022 goto out_free2;
2023 }
2024
2025 msg->hdr.version = cpu_to_le16(2);
2026 msg->hdr.tid = cpu_to_le64(req->r_tid);
2027
2028 head = msg->front.iov_base;
2029 p = msg->front.iov_base + sizeof(*head);
2030 end = msg->front.iov_base + msg->front.iov_len;
2031
2032 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
2033 head->op = cpu_to_le32(req->r_op);
2034 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
2035 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2036 head->args = req->r_args;
2037
2038 ceph_encode_filepath(&p, end, ino1, path1);
2039 ceph_encode_filepath(&p, end, ino2, path2);
2040
2041 /* make note of release offset, in case we need to replay */
2042 req->r_request_release_offset = p - msg->front.iov_base;
2043
2044 /* cap releases */
2045 releases = 0;
2046 if (req->r_inode_drop)
2047 releases += ceph_encode_inode_release(&p,
2048 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2049 mds, req->r_inode_drop, req->r_inode_unless, 0);
2050 if (req->r_dentry_drop)
2051 releases += ceph_encode_dentry_release(&p, req->r_dentry,
2052 req->r_parent, mds, req->r_dentry_drop,
2053 req->r_dentry_unless);
2054 if (req->r_old_dentry_drop)
2055 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
2056 req->r_old_dentry_dir, mds,
2057 req->r_old_dentry_drop,
2058 req->r_old_dentry_unless);
2059 if (req->r_old_inode_drop)
2060 releases += ceph_encode_inode_release(&p,
2061 d_inode(req->r_old_dentry),
2062 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
2063
2064 if (drop_cap_releases) {
2065 releases = 0;
2066 p = msg->front.iov_base + req->r_request_release_offset;
2067 }
2068
2069 head->num_releases = cpu_to_le16(releases);
2070
2071 /* time stamp */
2072 {
2073 struct ceph_timespec ts;
2074 ceph_encode_timespec(&ts, &req->r_stamp);
2075 ceph_encode_copy(&p, &ts, sizeof(ts));
2076 }
2077
2078 BUG_ON(p > end);
2079 msg->front.iov_len = p - msg->front.iov_base;
2080 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2081
2082 if (req->r_pagelist) {
2083 struct ceph_pagelist *pagelist = req->r_pagelist;
2084 refcount_inc(&pagelist->refcnt);
2085 ceph_msg_data_add_pagelist(msg, pagelist);
2086 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2087 } else {
2088 msg->hdr.data_len = 0;
2089 }
2090
2091 msg->hdr.data_off = cpu_to_le16(0);
2092
2093 out_free2:
2094 if (freepath2)
2095 kfree((char *)path2);
2096 out_free1:
2097 if (freepath1)
2098 kfree((char *)path1);
2099 out:
2100 return msg;
2101 }
2102
2103 /*
2104 * called under mdsc->mutex if error, under no mutex if
2105 * success.
2106 */
2107 static void complete_request(struct ceph_mds_client *mdsc,
2108 struct ceph_mds_request *req)
2109 {
2110 if (req->r_callback)
2111 req->r_callback(mdsc, req);
2112 else
2113 complete_all(&req->r_completion);
2114 }
2115
2116 /*
2117 * called under mdsc->mutex
2118 */
2119 static int __prepare_send_request(struct ceph_mds_client *mdsc,
2120 struct ceph_mds_request *req,
2121 int mds, bool drop_cap_releases)
2122 {
2123 struct ceph_mds_request_head *rhead;
2124 struct ceph_msg *msg;
2125 int flags = 0;
2126
2127 req->r_attempts++;
2128 if (req->r_inode) {
2129 struct ceph_cap *cap =
2130 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2131
2132 if (cap)
2133 req->r_sent_on_mseq = cap->mseq;
2134 else
2135 req->r_sent_on_mseq = -1;
2136 }
2137 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2138 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2139
2140 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2141 void *p;
2142 /*
2143 * Replay. Do not regenerate message (and rebuild
2144 * paths, etc.); just use the original message.
2145 * Rebuilding paths will break for renames because
2146 * d_move mangles the src name.
2147 */
2148 msg = req->r_request;
2149 rhead = msg->front.iov_base;
2150
2151 flags = le32_to_cpu(rhead->flags);
2152 flags |= CEPH_MDS_FLAG_REPLAY;
2153 rhead->flags = cpu_to_le32(flags);
2154
2155 if (req->r_target_inode)
2156 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2157
2158 rhead->num_retry = req->r_attempts - 1;
2159
2160 /* remove cap/dentry releases from message */
2161 rhead->num_releases = 0;
2162
2163 /* time stamp */
2164 p = msg->front.iov_base + req->r_request_release_offset;
2165 {
2166 struct ceph_timespec ts;
2167 ceph_encode_timespec(&ts, &req->r_stamp);
2168 ceph_encode_copy(&p, &ts, sizeof(ts));
2169 }
2170
2171 msg->front.iov_len = p - msg->front.iov_base;
2172 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2173 return 0;
2174 }
2175
2176 if (req->r_request) {
2177 ceph_msg_put(req->r_request);
2178 req->r_request = NULL;
2179 }
2180 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2181 if (IS_ERR(msg)) {
2182 req->r_err = PTR_ERR(msg);
2183 return PTR_ERR(msg);
2184 }
2185 req->r_request = msg;
2186
2187 rhead = msg->front.iov_base;
2188 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2189 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2190 flags |= CEPH_MDS_FLAG_REPLAY;
2191 if (req->r_parent)
2192 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2193 rhead->flags = cpu_to_le32(flags);
2194 rhead->num_fwd = req->r_num_fwd;
2195 rhead->num_retry = req->r_attempts - 1;
2196 rhead->ino = 0;
2197
2198 dout(" r_parent = %p\n", req->r_parent);
2199 return 0;
2200 }
2201
2202 /*
2203 * send request, or put it on the appropriate wait list.
2204 */
2205 static int __do_request(struct ceph_mds_client *mdsc,
2206 struct ceph_mds_request *req)
2207 {
2208 struct ceph_mds_session *session = NULL;
2209 int mds = -1;
2210 int err = 0;
2211
2212 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2213 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
2214 __unregister_request(mdsc, req);
2215 goto out;
2216 }
2217
2218 if (req->r_timeout &&
2219 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2220 dout("do_request timed out\n");
2221 err = -EIO;
2222 goto finish;
2223 }
2224 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2225 dout("do_request forced umount\n");
2226 err = -EIO;
2227 goto finish;
2228 }
2229 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2230 if (mdsc->mdsmap_err) {
2231 err = mdsc->mdsmap_err;
2232 dout("do_request mdsmap err %d\n", err);
2233 goto finish;
2234 }
2235 if (mdsc->mdsmap->m_epoch == 0) {
2236 dout("do_request no mdsmap, waiting for map\n");
2237 list_add(&req->r_wait, &mdsc->waiting_for_map);
2238 goto finish;
2239 }
2240 if (!(mdsc->fsc->mount_options->flags &
2241 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2242 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2243 err = -ENOENT;
2244 pr_info("probably no mds server is up\n");
2245 goto finish;
2246 }
2247 }
2248
2249 put_request_session(req);
2250
2251 mds = __choose_mds(mdsc, req);
2252 if (mds < 0 ||
2253 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2254 dout("do_request no mds or not active, waiting for map\n");
2255 list_add(&req->r_wait, &mdsc->waiting_for_map);
2256 goto out;
2257 }
2258
2259 /* get, open session */
2260 session = __ceph_lookup_mds_session(mdsc, mds);
2261 if (!session) {
2262 session = register_session(mdsc, mds);
2263 if (IS_ERR(session)) {
2264 err = PTR_ERR(session);
2265 goto finish;
2266 }
2267 }
2268 req->r_session = get_session(session);
2269
2270 dout("do_request mds%d session %p state %s\n", mds, session,
2271 ceph_session_state_name(session->s_state));
2272 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2273 session->s_state != CEPH_MDS_SESSION_HUNG) {
2274 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2275 err = -EACCES;
2276 goto out_session;
2277 }
2278 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2279 session->s_state == CEPH_MDS_SESSION_CLOSING)
2280 __open_session(mdsc, session);
2281 list_add(&req->r_wait, &session->s_waiting);
2282 goto out_session;
2283 }
2284
2285 /* send request */
2286 req->r_resend_mds = -1; /* forget any previous mds hint */
2287
2288 if (req->r_request_started == 0) /* note request start time */
2289 req->r_request_started = jiffies;
2290
2291 err = __prepare_send_request(mdsc, req, mds, false);
2292 if (!err) {
2293 ceph_msg_get(req->r_request);
2294 ceph_con_send(&session->s_con, req->r_request);
2295 }
2296
2297 out_session:
2298 ceph_put_mds_session(session);
2299 finish:
2300 if (err) {
2301 dout("__do_request early error %d\n", err);
2302 req->r_err = err;
2303 complete_request(mdsc, req);
2304 __unregister_request(mdsc, req);
2305 }
2306 out:
2307 return err;
2308 }
2309
2310 /*
2311 * called under mdsc->mutex
2312 */
2313 static void __wake_requests(struct ceph_mds_client *mdsc,
2314 struct list_head *head)
2315 {
2316 struct ceph_mds_request *req;
2317 LIST_HEAD(tmp_list);
2318
2319 list_splice_init(head, &tmp_list);
2320
2321 while (!list_empty(&tmp_list)) {
2322 req = list_entry(tmp_list.next,
2323 struct ceph_mds_request, r_wait);
2324 list_del_init(&req->r_wait);
2325 dout(" wake request %p tid %llu\n", req, req->r_tid);
2326 __do_request(mdsc, req);
2327 }
2328 }
2329
2330 /*
2331 * Wake up threads with requests pending for @mds, so that they can
2332 * resubmit their requests to a possibly different mds.
2333 */
2334 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2335 {
2336 struct ceph_mds_request *req;
2337 struct rb_node *p = rb_first(&mdsc->request_tree);
2338
2339 dout("kick_requests mds%d\n", mds);
2340 while (p) {
2341 req = rb_entry(p, struct ceph_mds_request, r_node);
2342 p = rb_next(p);
2343 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2344 continue;
2345 if (req->r_attempts > 0)
2346 continue; /* only new requests */
2347 if (req->r_session &&
2348 req->r_session->s_mds == mds) {
2349 dout(" kicking tid %llu\n", req->r_tid);
2350 list_del_init(&req->r_wait);
2351 __do_request(mdsc, req);
2352 }
2353 }
2354 }
2355
2356 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2357 struct ceph_mds_request *req)
2358 {
2359 dout("submit_request on %p\n", req);
2360 mutex_lock(&mdsc->mutex);
2361 __register_request(mdsc, req, NULL);
2362 __do_request(mdsc, req);
2363 mutex_unlock(&mdsc->mutex);
2364 }
2365
2366 /*
2367 * Synchrously perform an mds request. Take care of all of the
2368 * session setup, forwarding, retry details.
2369 */
2370 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2371 struct inode *dir,
2372 struct ceph_mds_request *req)
2373 {
2374 int err;
2375
2376 dout("do_request on %p\n", req);
2377
2378 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
2379 if (req->r_inode)
2380 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2381 if (req->r_parent)
2382 ceph_get_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
2383 if (req->r_old_dentry_dir)
2384 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2385 CEPH_CAP_PIN);
2386
2387 /* issue */
2388 mutex_lock(&mdsc->mutex);
2389 __register_request(mdsc, req, dir);
2390 __do_request(mdsc, req);
2391
2392 if (req->r_err) {
2393 err = req->r_err;
2394 goto out;
2395 }
2396
2397 /* wait */
2398 mutex_unlock(&mdsc->mutex);
2399 dout("do_request waiting\n");
2400 if (!req->r_timeout && req->r_wait_for_completion) {
2401 err = req->r_wait_for_completion(mdsc, req);
2402 } else {
2403 long timeleft = wait_for_completion_killable_timeout(
2404 &req->r_completion,
2405 ceph_timeout_jiffies(req->r_timeout));
2406 if (timeleft > 0)
2407 err = 0;
2408 else if (!timeleft)
2409 err = -EIO; /* timed out */
2410 else
2411 err = timeleft; /* killed */
2412 }
2413 dout("do_request waited, got %d\n", err);
2414 mutex_lock(&mdsc->mutex);
2415
2416 /* only abort if we didn't race with a real reply */
2417 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2418 err = le32_to_cpu(req->r_reply_info.head->result);
2419 } else if (err < 0) {
2420 dout("aborted request %lld with %d\n", req->r_tid, err);
2421
2422 /*
2423 * ensure we aren't running concurrently with
2424 * ceph_fill_trace or ceph_readdir_prepopulate, which
2425 * rely on locks (dir mutex) held by our caller.
2426 */
2427 mutex_lock(&req->r_fill_mutex);
2428 req->r_err = err;
2429 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
2430 mutex_unlock(&req->r_fill_mutex);
2431
2432 if (req->r_parent &&
2433 (req->r_op & CEPH_MDS_OP_WRITE))
2434 ceph_invalidate_dir_request(req);
2435 } else {
2436 err = req->r_err;
2437 }
2438
2439 out:
2440 mutex_unlock(&mdsc->mutex);
2441 dout("do_request %p done, result %d\n", req, err);
2442 return err;
2443 }
2444
2445 /*
2446 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2447 * namespace request.
2448 */
2449 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2450 {
2451 struct inode *dir = req->r_parent;
2452 struct inode *old_dir = req->r_old_dentry_dir;
2453
2454 dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
2455
2456 ceph_dir_clear_complete(dir);
2457 if (old_dir)
2458 ceph_dir_clear_complete(old_dir);
2459 if (req->r_dentry)
2460 ceph_invalidate_dentry_lease(req->r_dentry);
2461 if (req->r_old_dentry)
2462 ceph_invalidate_dentry_lease(req->r_old_dentry);
2463 }
2464
2465 /*
2466 * Handle mds reply.
2467 *
2468 * We take the session mutex and parse and process the reply immediately.
2469 * This preserves the logical ordering of replies, capabilities, etc., sent
2470 * by the MDS as they are applied to our local cache.
2471 */
2472 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2473 {
2474 struct ceph_mds_client *mdsc = session->s_mdsc;
2475 struct ceph_mds_request *req;
2476 struct ceph_mds_reply_head *head = msg->front.iov_base;
2477 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2478 struct ceph_snap_realm *realm;
2479 u64 tid;
2480 int err, result;
2481 int mds = session->s_mds;
2482
2483 if (msg->front.iov_len < sizeof(*head)) {
2484 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2485 ceph_msg_dump(msg);
2486 return;
2487 }
2488
2489 /* get request, session */
2490 tid = le64_to_cpu(msg->hdr.tid);
2491 mutex_lock(&mdsc->mutex);
2492 req = lookup_get_request(mdsc, tid);
2493 if (!req) {
2494 dout("handle_reply on unknown tid %llu\n", tid);
2495 mutex_unlock(&mdsc->mutex);
2496 return;
2497 }
2498 dout("handle_reply %p\n", req);
2499
2500 /* correct session? */
2501 if (req->r_session != session) {
2502 pr_err("mdsc_handle_reply got %llu on session mds%d"
2503 " not mds%d\n", tid, session->s_mds,
2504 req->r_session ? req->r_session->s_mds : -1);
2505 mutex_unlock(&mdsc->mutex);
2506 goto out;
2507 }
2508
2509 /* dup? */
2510 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
2511 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
2512 pr_warn("got a dup %s reply on %llu from mds%d\n",
2513 head->safe ? "safe" : "unsafe", tid, mds);
2514 mutex_unlock(&mdsc->mutex);
2515 goto out;
2516 }
2517 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
2518 pr_warn("got unsafe after safe on %llu from mds%d\n",
2519 tid, mds);
2520 mutex_unlock(&mdsc->mutex);
2521 goto out;
2522 }
2523
2524 result = le32_to_cpu(head->result);
2525
2526 /*
2527 * Handle an ESTALE
2528 * if we're not talking to the authority, send to them
2529 * if the authority has changed while we weren't looking,
2530 * send to new authority
2531 * Otherwise we just have to return an ESTALE
2532 */
2533 if (result == -ESTALE) {
2534 dout("got ESTALE on request %llu", req->r_tid);
2535 req->r_resend_mds = -1;
2536 if (req->r_direct_mode != USE_AUTH_MDS) {
2537 dout("not using auth, setting for that now");
2538 req->r_direct_mode = USE_AUTH_MDS;
2539 __do_request(mdsc, req);
2540 mutex_unlock(&mdsc->mutex);
2541 goto out;
2542 } else {
2543 int mds = __choose_mds(mdsc, req);
2544 if (mds >= 0 && mds != req->r_session->s_mds) {
2545 dout("but auth changed, so resending");
2546 __do_request(mdsc, req);
2547 mutex_unlock(&mdsc->mutex);
2548 goto out;
2549 }
2550 }
2551 dout("have to return ESTALE on request %llu", req->r_tid);
2552 }
2553
2554
2555 if (head->safe) {
2556 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2557 __unregister_request(mdsc, req);
2558
2559 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2560 /*
2561 * We already handled the unsafe response, now do the
2562 * cleanup. No need to examine the response; the MDS
2563 * doesn't include any result info in the safe
2564 * response. And even if it did, there is nothing
2565 * useful we could do with a revised return value.
2566 */
2567 dout("got safe reply %llu, mds%d\n", tid, mds);
2568
2569 /* last unsafe request during umount? */
2570 if (mdsc->stopping && !__get_oldest_req(mdsc))
2571 complete_all(&mdsc->safe_umount_waiters);
2572 mutex_unlock(&mdsc->mutex);
2573 goto out;
2574 }
2575 } else {
2576 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2577 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2578 if (req->r_unsafe_dir) {
2579 struct ceph_inode_info *ci =
2580 ceph_inode(req->r_unsafe_dir);
2581 spin_lock(&ci->i_unsafe_lock);
2582 list_add_tail(&req->r_unsafe_dir_item,
2583 &ci->i_unsafe_dirops);
2584 spin_unlock(&ci->i_unsafe_lock);
2585 }
2586 }
2587
2588 dout("handle_reply tid %lld result %d\n", tid, result);
2589 rinfo = &req->r_reply_info;
2590 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2591 mutex_unlock(&mdsc->mutex);
2592
2593 mutex_lock(&session->s_mutex);
2594 if (err < 0) {
2595 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2596 ceph_msg_dump(msg);
2597 goto out_err;
2598 }
2599
2600 /* snap trace */
2601 realm = NULL;
2602 if (rinfo->snapblob_len) {
2603 down_write(&mdsc->snap_rwsem);
2604 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2605 rinfo->snapblob + rinfo->snapblob_len,
2606 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2607 &realm);
2608 downgrade_write(&mdsc->snap_rwsem);
2609 } else {
2610 down_read(&mdsc->snap_rwsem);
2611 }
2612
2613 /* insert trace into our cache */
2614 mutex_lock(&req->r_fill_mutex);
2615 current->journal_info = req;
2616 err = ceph_fill_trace(mdsc->fsc->sb, req);
2617 if (err == 0) {
2618 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2619 req->r_op == CEPH_MDS_OP_LSSNAP))
2620 ceph_readdir_prepopulate(req, req->r_session);
2621 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2622 }
2623 current->journal_info = NULL;
2624 mutex_unlock(&req->r_fill_mutex);
2625
2626 up_read(&mdsc->snap_rwsem);
2627 if (realm)
2628 ceph_put_snap_realm(mdsc, realm);
2629
2630 if (err == 0 && req->r_target_inode &&
2631 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2632 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2633 spin_lock(&ci->i_unsafe_lock);
2634 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2635 spin_unlock(&ci->i_unsafe_lock);
2636 }
2637 out_err:
2638 mutex_lock(&mdsc->mutex);
2639 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2640 if (err) {
2641 req->r_err = err;
2642 } else {
2643 req->r_reply = ceph_msg_get(msg);
2644 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
2645 }
2646 } else {
2647 dout("reply arrived after request %lld was aborted\n", tid);
2648 }
2649 mutex_unlock(&mdsc->mutex);
2650
2651 mutex_unlock(&session->s_mutex);
2652
2653 /* kick calling process */
2654 complete_request(mdsc, req);
2655 out:
2656 ceph_mdsc_put_request(req);
2657 return;
2658 }
2659
2660
2661
2662 /*
2663 * handle mds notification that our request has been forwarded.
2664 */
2665 static void handle_forward(struct ceph_mds_client *mdsc,
2666 struct ceph_mds_session *session,
2667 struct ceph_msg *msg)
2668 {
2669 struct ceph_mds_request *req;
2670 u64 tid = le64_to_cpu(msg->hdr.tid);
2671 u32 next_mds;
2672 u32 fwd_seq;
2673 int err = -EINVAL;
2674 void *p = msg->front.iov_base;
2675 void *end = p + msg->front.iov_len;
2676
2677 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2678 next_mds = ceph_decode_32(&p);
2679 fwd_seq = ceph_decode_32(&p);
2680
2681 mutex_lock(&mdsc->mutex);
2682 req = lookup_get_request(mdsc, tid);
2683 if (!req) {
2684 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2685 goto out; /* dup reply? */
2686 }
2687
2688 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2689 dout("forward tid %llu aborted, unregistering\n", tid);
2690 __unregister_request(mdsc, req);
2691 } else if (fwd_seq <= req->r_num_fwd) {
2692 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2693 tid, next_mds, req->r_num_fwd, fwd_seq);
2694 } else {
2695 /* resend. forward race not possible; mds would drop */
2696 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2697 BUG_ON(req->r_err);
2698 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
2699 req->r_attempts = 0;
2700 req->r_num_fwd = fwd_seq;
2701 req->r_resend_mds = next_mds;
2702 put_request_session(req);
2703 __do_request(mdsc, req);
2704 }
2705 ceph_mdsc_put_request(req);
2706 out:
2707 mutex_unlock(&mdsc->mutex);
2708 return;
2709
2710 bad:
2711 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2712 }
2713
2714 /*
2715 * handle a mds session control message
2716 */
2717 static void handle_session(struct ceph_mds_session *session,
2718 struct ceph_msg *msg)
2719 {
2720 struct ceph_mds_client *mdsc = session->s_mdsc;
2721 u32 op;
2722 u64 seq;
2723 int mds = session->s_mds;
2724 struct ceph_mds_session_head *h = msg->front.iov_base;
2725 int wake = 0;
2726
2727 /* decode */
2728 if (msg->front.iov_len != sizeof(*h))
2729 goto bad;
2730 op = le32_to_cpu(h->op);
2731 seq = le64_to_cpu(h->seq);
2732
2733 mutex_lock(&mdsc->mutex);
2734 if (op == CEPH_SESSION_CLOSE) {
2735 get_session(session);
2736 __unregister_session(mdsc, session);
2737 }
2738 /* FIXME: this ttl calculation is generous */
2739 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2740 mutex_unlock(&mdsc->mutex);
2741
2742 mutex_lock(&session->s_mutex);
2743
2744 dout("handle_session mds%d %s %p state %s seq %llu\n",
2745 mds, ceph_session_op_name(op), session,
2746 ceph_session_state_name(session->s_state), seq);
2747
2748 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2749 session->s_state = CEPH_MDS_SESSION_OPEN;
2750 pr_info("mds%d came back\n", session->s_mds);
2751 }
2752
2753 switch (op) {
2754 case CEPH_SESSION_OPEN:
2755 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2756 pr_info("mds%d reconnect success\n", session->s_mds);
2757 session->s_state = CEPH_MDS_SESSION_OPEN;
2758 renewed_caps(mdsc, session, 0);
2759 wake = 1;
2760 if (mdsc->stopping)
2761 __close_session(mdsc, session);
2762 break;
2763
2764 case CEPH_SESSION_RENEWCAPS:
2765 if (session->s_renew_seq == seq)
2766 renewed_caps(mdsc, session, 1);
2767 break;
2768
2769 case CEPH_SESSION_CLOSE:
2770 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2771 pr_info("mds%d reconnect denied\n", session->s_mds);
2772 cleanup_session_requests(mdsc, session);
2773 remove_session_caps(session);
2774 wake = 2; /* for good measure */
2775 wake_up_all(&mdsc->session_close_wq);
2776 break;
2777
2778 case CEPH_SESSION_STALE:
2779 pr_info("mds%d caps went stale, renewing\n",
2780 session->s_mds);
2781 spin_lock(&session->s_gen_ttl_lock);
2782 session->s_cap_gen++;
2783 session->s_cap_ttl = jiffies - 1;
2784 spin_unlock(&session->s_gen_ttl_lock);
2785 send_renew_caps(mdsc, session);
2786 break;
2787
2788 case CEPH_SESSION_RECALL_STATE:
2789 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2790 break;
2791
2792 case CEPH_SESSION_FLUSHMSG:
2793 send_flushmsg_ack(mdsc, session, seq);
2794 break;
2795
2796 case CEPH_SESSION_FORCE_RO:
2797 dout("force_session_readonly %p\n", session);
2798 spin_lock(&session->s_cap_lock);
2799 session->s_readonly = true;
2800 spin_unlock(&session->s_cap_lock);
2801 wake_up_session_caps(session, 0);
2802 break;
2803
2804 case CEPH_SESSION_REJECT:
2805 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
2806 pr_info("mds%d rejected session\n", session->s_mds);
2807 session->s_state = CEPH_MDS_SESSION_REJECTED;
2808 cleanup_session_requests(mdsc, session);
2809 remove_session_caps(session);
2810 wake = 2; /* for good measure */
2811 break;
2812
2813 default:
2814 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2815 WARN_ON(1);
2816 }
2817
2818 mutex_unlock(&session->s_mutex);
2819 if (wake) {
2820 mutex_lock(&mdsc->mutex);
2821 __wake_requests(mdsc, &session->s_waiting);
2822 if (wake == 2)
2823 kick_requests(mdsc, mds);
2824 mutex_unlock(&mdsc->mutex);
2825 }
2826 if (op == CEPH_SESSION_CLOSE)
2827 ceph_put_mds_session(session);
2828 return;
2829
2830 bad:
2831 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2832 (int)msg->front.iov_len);
2833 ceph_msg_dump(msg);
2834 return;
2835 }
2836
2837
2838 /*
2839 * called under session->mutex.
2840 */
2841 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2842 struct ceph_mds_session *session)
2843 {
2844 struct ceph_mds_request *req, *nreq;
2845 struct rb_node *p;
2846 int err;
2847
2848 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2849
2850 mutex_lock(&mdsc->mutex);
2851 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2852 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2853 if (!err) {
2854 ceph_msg_get(req->r_request);
2855 ceph_con_send(&session->s_con, req->r_request);
2856 }
2857 }
2858
2859 /*
2860 * also re-send old requests when MDS enters reconnect stage. So that MDS
2861 * can process completed request in clientreplay stage.
2862 */
2863 p = rb_first(&mdsc->request_tree);
2864 while (p) {
2865 req = rb_entry(p, struct ceph_mds_request, r_node);
2866 p = rb_next(p);
2867 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2868 continue;
2869 if (req->r_attempts == 0)
2870 continue; /* only old requests */
2871 if (req->r_session &&
2872 req->r_session->s_mds == session->s_mds) {
2873 err = __prepare_send_request(mdsc, req,
2874 session->s_mds, true);
2875 if (!err) {
2876 ceph_msg_get(req->r_request);
2877 ceph_con_send(&session->s_con, req->r_request);
2878 }
2879 }
2880 }
2881 mutex_unlock(&mdsc->mutex);
2882 }
2883
2884 /*
2885 * Encode information about a cap for a reconnect with the MDS.
2886 */
2887 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2888 void *arg)
2889 {
2890 union {
2891 struct ceph_mds_cap_reconnect v2;
2892 struct ceph_mds_cap_reconnect_v1 v1;
2893 } rec;
2894 struct ceph_inode_info *ci = cap->ci;
2895 struct ceph_reconnect_state *recon_state = arg;
2896 struct ceph_pagelist *pagelist = recon_state->pagelist;
2897 char *path;
2898 int pathlen, err;
2899 u64 pathbase;
2900 u64 snap_follows;
2901 struct dentry *dentry;
2902
2903 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2904 inode, ceph_vinop(inode), cap, cap->cap_id,
2905 ceph_cap_string(cap->issued));
2906 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2907 if (err)
2908 return err;
2909
2910 dentry = d_find_alias(inode);
2911 if (dentry) {
2912 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2913 if (IS_ERR(path)) {
2914 err = PTR_ERR(path);
2915 goto out_dput;
2916 }
2917 } else {
2918 path = NULL;
2919 pathlen = 0;
2920 pathbase = 0;
2921 }
2922
2923 spin_lock(&ci->i_ceph_lock);
2924 cap->seq = 0; /* reset cap seq */
2925 cap->issue_seq = 0; /* and issue_seq */
2926 cap->mseq = 0; /* and migrate_seq */
2927 cap->cap_gen = cap->session->s_cap_gen;
2928
2929 if (recon_state->msg_version >= 2) {
2930 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2931 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2932 rec.v2.issued = cpu_to_le32(cap->issued);
2933 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2934 rec.v2.pathbase = cpu_to_le64(pathbase);
2935 rec.v2.flock_len = (__force __le32)
2936 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
2937 } else {
2938 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2939 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2940 rec.v1.issued = cpu_to_le32(cap->issued);
2941 rec.v1.size = cpu_to_le64(inode->i_size);
2942 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2943 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2944 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2945 rec.v1.pathbase = cpu_to_le64(pathbase);
2946 }
2947
2948 if (list_empty(&ci->i_cap_snaps)) {
2949 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
2950 } else {
2951 struct ceph_cap_snap *capsnap =
2952 list_first_entry(&ci->i_cap_snaps,
2953 struct ceph_cap_snap, ci_item);
2954 snap_follows = capsnap->follows;
2955 }
2956 spin_unlock(&ci->i_ceph_lock);
2957
2958 if (recon_state->msg_version >= 2) {
2959 int num_fcntl_locks, num_flock_locks;
2960 struct ceph_filelock *flocks = NULL;
2961 size_t struct_len, total_len = 0;
2962 u8 struct_v = 0;
2963
2964 encode_again:
2965 if (rec.v2.flock_len) {
2966 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
2967 } else {
2968 num_fcntl_locks = 0;
2969 num_flock_locks = 0;
2970 }
2971 if (num_fcntl_locks + num_flock_locks > 0) {
2972 flocks = kmalloc((num_fcntl_locks + num_flock_locks) *
2973 sizeof(struct ceph_filelock), GFP_NOFS);
2974 if (!flocks) {
2975 err = -ENOMEM;
2976 goto out_free;
2977 }
2978 err = ceph_encode_locks_to_buffer(inode, flocks,
2979 num_fcntl_locks,
2980 num_flock_locks);
2981 if (err) {
2982 kfree(flocks);
2983 flocks = NULL;
2984 if (err == -ENOSPC)
2985 goto encode_again;
2986 goto out_free;
2987 }
2988 } else {
2989 kfree(flocks);
2990 flocks = NULL;
2991 }
2992
2993 if (recon_state->msg_version >= 3) {
2994 /* version, compat_version and struct_len */
2995 total_len = 2 * sizeof(u8) + sizeof(u32);
2996 struct_v = 2;
2997 }
2998 /*
2999 * number of encoded locks is stable, so copy to pagelist
3000 */
3001 struct_len = 2 * sizeof(u32) +
3002 (num_fcntl_locks + num_flock_locks) *
3003 sizeof(struct ceph_filelock);
3004 rec.v2.flock_len = cpu_to_le32(struct_len);
3005
3006 struct_len += sizeof(rec.v2);
3007 struct_len += sizeof(u32) + pathlen;
3008
3009 if (struct_v >= 2)
3010 struct_len += sizeof(u64); /* snap_follows */
3011
3012 total_len += struct_len;
3013 err = ceph_pagelist_reserve(pagelist, total_len);
3014
3015 if (!err) {
3016 if (recon_state->msg_version >= 3) {
3017 ceph_pagelist_encode_8(pagelist, struct_v);
3018 ceph_pagelist_encode_8(pagelist, 1);
3019 ceph_pagelist_encode_32(pagelist, struct_len);
3020 }
3021 ceph_pagelist_encode_string(pagelist, path, pathlen);
3022 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
3023 ceph_locks_to_pagelist(flocks, pagelist,
3024 num_fcntl_locks,
3025 num_flock_locks);
3026 if (struct_v >= 2)
3027 ceph_pagelist_encode_64(pagelist, snap_follows);
3028 }
3029 kfree(flocks);
3030 } else {
3031 size_t size = sizeof(u32) + pathlen + sizeof(rec.v1);
3032 err = ceph_pagelist_reserve(pagelist, size);
3033 if (!err) {
3034 ceph_pagelist_encode_string(pagelist, path, pathlen);
3035 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
3036 }
3037 }
3038
3039 recon_state->nr_caps++;
3040 out_free:
3041 kfree(path);
3042 out_dput:
3043 dput(dentry);
3044 return err;
3045 }
3046
3047
3048 /*
3049 * If an MDS fails and recovers, clients need to reconnect in order to
3050 * reestablish shared state. This includes all caps issued through
3051 * this session _and_ the snap_realm hierarchy. Because it's not
3052 * clear which snap realms the mds cares about, we send everything we
3053 * know about.. that ensures we'll then get any new info the
3054 * recovering MDS might have.
3055 *
3056 * This is a relatively heavyweight operation, but it's rare.
3057 *
3058 * called with mdsc->mutex held.
3059 */
3060 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
3061 struct ceph_mds_session *session)
3062 {
3063 struct ceph_msg *reply;
3064 struct rb_node *p;
3065 int mds = session->s_mds;
3066 int err = -ENOMEM;
3067 int s_nr_caps;
3068 struct ceph_pagelist *pagelist;
3069 struct ceph_reconnect_state recon_state;
3070 LIST_HEAD(dispose);
3071
3072 pr_info("mds%d reconnect start\n", mds);
3073
3074 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
3075 if (!pagelist)
3076 goto fail_nopagelist;
3077 ceph_pagelist_init(pagelist);
3078
3079 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
3080 if (!reply)
3081 goto fail_nomsg;
3082
3083 mutex_lock(&session->s_mutex);
3084 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
3085 session->s_seq = 0;
3086
3087 dout("session %p state %s\n", session,
3088 ceph_session_state_name(session->s_state));
3089
3090 spin_lock(&session->s_gen_ttl_lock);
3091 session->s_cap_gen++;
3092 spin_unlock(&session->s_gen_ttl_lock);
3093
3094 spin_lock(&session->s_cap_lock);
3095 /* don't know if session is readonly */
3096 session->s_readonly = 0;
3097 /*
3098 * notify __ceph_remove_cap() that we are composing cap reconnect.
3099 * If a cap get released before being added to the cap reconnect,
3100 * __ceph_remove_cap() should skip queuing cap release.
3101 */
3102 session->s_cap_reconnect = 1;
3103 /* drop old cap expires; we're about to reestablish that state */
3104 detach_cap_releases(session, &dispose);
3105 spin_unlock(&session->s_cap_lock);
3106 dispose_cap_releases(mdsc, &dispose);
3107
3108 /* trim unused caps to reduce MDS's cache rejoin time */
3109 if (mdsc->fsc->sb->s_root)
3110 shrink_dcache_parent(mdsc->fsc->sb->s_root);
3111
3112 ceph_con_close(&session->s_con);
3113 ceph_con_open(&session->s_con,
3114 CEPH_ENTITY_TYPE_MDS, mds,
3115 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
3116
3117 /* replay unsafe requests */
3118 replay_unsafe_requests(mdsc, session);
3119
3120 down_read(&mdsc->snap_rwsem);
3121
3122 /* traverse this session's caps */
3123 s_nr_caps = session->s_nr_caps;
3124 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
3125 if (err)
3126 goto fail;
3127
3128 recon_state.nr_caps = 0;
3129 recon_state.pagelist = pagelist;
3130 if (session->s_con.peer_features & CEPH_FEATURE_MDSENC)
3131 recon_state.msg_version = 3;
3132 else if (session->s_con.peer_features & CEPH_FEATURE_FLOCK)
3133 recon_state.msg_version = 2;
3134 else
3135 recon_state.msg_version = 1;
3136 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
3137 if (err < 0)
3138 goto fail;
3139
3140 spin_lock(&session->s_cap_lock);
3141 session->s_cap_reconnect = 0;
3142 spin_unlock(&session->s_cap_lock);
3143
3144 /*
3145 * snaprealms. we provide mds with the ino, seq (version), and
3146 * parent for all of our realms. If the mds has any newer info,
3147 * it will tell us.
3148 */
3149 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3150 struct ceph_snap_realm *realm =
3151 rb_entry(p, struct ceph_snap_realm, node);
3152 struct ceph_mds_snaprealm_reconnect sr_rec;
3153
3154 dout(" adding snap realm %llx seq %lld parent %llx\n",
3155 realm->ino, realm->seq, realm->parent_ino);
3156 sr_rec.ino = cpu_to_le64(realm->ino);
3157 sr_rec.seq = cpu_to_le64(realm->seq);
3158 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3159 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3160 if (err)
3161 goto fail;
3162 }
3163
3164 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
3165
3166 /* raced with cap release? */
3167 if (s_nr_caps != recon_state.nr_caps) {
3168 struct page *page = list_first_entry(&pagelist->head,
3169 struct page, lru);
3170 __le32 *addr = kmap_atomic(page);
3171 *addr = cpu_to_le32(recon_state.nr_caps);
3172 kunmap_atomic(addr);
3173 }
3174
3175 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3176 ceph_msg_data_add_pagelist(reply, pagelist);
3177
3178 ceph_early_kick_flushing_caps(mdsc, session);
3179
3180 ceph_con_send(&session->s_con, reply);
3181
3182 mutex_unlock(&session->s_mutex);
3183
3184 mutex_lock(&mdsc->mutex);
3185 __wake_requests(mdsc, &session->s_waiting);
3186 mutex_unlock(&mdsc->mutex);
3187
3188 up_read(&mdsc->snap_rwsem);
3189 return;
3190
3191 fail:
3192 ceph_msg_put(reply);
3193 up_read(&mdsc->snap_rwsem);
3194 mutex_unlock(&session->s_mutex);
3195 fail_nomsg:
3196 ceph_pagelist_release(pagelist);
3197 fail_nopagelist:
3198 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
3199 return;
3200 }
3201
3202
3203 /*
3204 * compare old and new mdsmaps, kicking requests
3205 * and closing out old connections as necessary
3206 *
3207 * called under mdsc->mutex.
3208 */
3209 static void check_new_map(struct ceph_mds_client *mdsc,
3210 struct ceph_mdsmap *newmap,
3211 struct ceph_mdsmap *oldmap)
3212 {
3213 int i;
3214 int oldstate, newstate;
3215 struct ceph_mds_session *s;
3216
3217 dout("check_new_map new %u old %u\n",
3218 newmap->m_epoch, oldmap->m_epoch);
3219
3220 for (i = 0; i < oldmap->m_num_mds && i < mdsc->max_sessions; i++) {
3221 if (!mdsc->sessions[i])
3222 continue;
3223 s = mdsc->sessions[i];
3224 oldstate = ceph_mdsmap_get_state(oldmap, i);
3225 newstate = ceph_mdsmap_get_state(newmap, i);
3226
3227 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3228 i, ceph_mds_state_name(oldstate),
3229 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
3230 ceph_mds_state_name(newstate),
3231 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
3232 ceph_session_state_name(s->s_state));
3233
3234 if (i >= newmap->m_num_mds ||
3235 memcmp(ceph_mdsmap_get_addr(oldmap, i),
3236 ceph_mdsmap_get_addr(newmap, i),
3237 sizeof(struct ceph_entity_addr))) {
3238 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3239 /* the session never opened, just close it
3240 * out now */
3241 get_session(s);
3242 __unregister_session(mdsc, s);
3243 __wake_requests(mdsc, &s->s_waiting);
3244 ceph_put_mds_session(s);
3245 } else if (i >= newmap->m_num_mds) {
3246 /* force close session for stopped mds */
3247 get_session(s);
3248 __unregister_session(mdsc, s);
3249 __wake_requests(mdsc, &s->s_waiting);
3250 kick_requests(mdsc, i);
3251 mutex_unlock(&mdsc->mutex);
3252
3253 mutex_lock(&s->s_mutex);
3254 cleanup_session_requests(mdsc, s);
3255 remove_session_caps(s);
3256 mutex_unlock(&s->s_mutex);
3257
3258 ceph_put_mds_session(s);
3259
3260 mutex_lock(&mdsc->mutex);
3261 } else {
3262 /* just close it */
3263 mutex_unlock(&mdsc->mutex);
3264 mutex_lock(&s->s_mutex);
3265 mutex_lock(&mdsc->mutex);
3266 ceph_con_close(&s->s_con);
3267 mutex_unlock(&s->s_mutex);
3268 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3269 }
3270 } else if (oldstate == newstate) {
3271 continue; /* nothing new with this mds */
3272 }
3273
3274 /*
3275 * send reconnect?
3276 */
3277 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
3278 newstate >= CEPH_MDS_STATE_RECONNECT) {
3279 mutex_unlock(&mdsc->mutex);
3280 send_mds_reconnect(mdsc, s);
3281 mutex_lock(&mdsc->mutex);
3282 }
3283
3284 /*
3285 * kick request on any mds that has gone active.
3286 */
3287 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3288 newstate >= CEPH_MDS_STATE_ACTIVE) {
3289 if (oldstate != CEPH_MDS_STATE_CREATING &&
3290 oldstate != CEPH_MDS_STATE_STARTING)
3291 pr_info("mds%d recovery completed\n", s->s_mds);
3292 kick_requests(mdsc, i);
3293 ceph_kick_flushing_caps(mdsc, s);
3294 wake_up_session_caps(s, 1);
3295 }
3296 }
3297
3298 for (i = 0; i < newmap->m_num_mds && i < mdsc->max_sessions; i++) {
3299 s = mdsc->sessions[i];
3300 if (!s)
3301 continue;
3302 if (!ceph_mdsmap_is_laggy(newmap, i))
3303 continue;
3304 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3305 s->s_state == CEPH_MDS_SESSION_HUNG ||
3306 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3307 dout(" connecting to export targets of laggy mds%d\n",
3308 i);
3309 __open_export_target_sessions(mdsc, s);
3310 }
3311 }
3312 }
3313
3314
3315
3316 /*
3317 * leases
3318 */
3319
3320 /*
3321 * caller must hold session s_mutex, dentry->d_lock
3322 */
3323 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3324 {
3325 struct ceph_dentry_info *di = ceph_dentry(dentry);
3326
3327 ceph_put_mds_session(di->lease_session);
3328 di->lease_session = NULL;
3329 }
3330
3331 static void handle_lease(struct ceph_mds_client *mdsc,
3332 struct ceph_mds_session *session,
3333 struct ceph_msg *msg)
3334 {
3335 struct super_block *sb = mdsc->fsc->sb;
3336 struct inode *inode;
3337 struct dentry *parent, *dentry;
3338 struct ceph_dentry_info *di;
3339 int mds = session->s_mds;
3340 struct ceph_mds_lease *h = msg->front.iov_base;
3341 u32 seq;
3342 struct ceph_vino vino;
3343 struct qstr dname;
3344 int release = 0;
3345
3346 dout("handle_lease from mds%d\n", mds);
3347
3348 /* decode */
3349 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3350 goto bad;
3351 vino.ino = le64_to_cpu(h->ino);
3352 vino.snap = CEPH_NOSNAP;
3353 seq = le32_to_cpu(h->seq);
3354 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3355 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3356 if (dname.len != get_unaligned_le32(h+1))
3357 goto bad;
3358
3359 /* lookup inode */
3360 inode = ceph_find_inode(sb, vino);
3361 dout("handle_lease %s, ino %llx %p %.*s\n",
3362 ceph_lease_op_name(h->action), vino.ino, inode,
3363 dname.len, dname.name);
3364
3365 mutex_lock(&session->s_mutex);
3366 session->s_seq++;
3367
3368 if (!inode) {
3369 dout("handle_lease no inode %llx\n", vino.ino);
3370 goto release;
3371 }
3372
3373 /* dentry */
3374 parent = d_find_alias(inode);
3375 if (!parent) {
3376 dout("no parent dentry on inode %p\n", inode);
3377 WARN_ON(1);
3378 goto release; /* hrm... */
3379 }
3380 dname.hash = full_name_hash(parent, dname.name, dname.len);
3381 dentry = d_lookup(parent, &dname);
3382 dput(parent);
3383 if (!dentry)
3384 goto release;
3385
3386 spin_lock(&dentry->d_lock);
3387 di = ceph_dentry(dentry);
3388 switch (h->action) {
3389 case CEPH_MDS_LEASE_REVOKE:
3390 if (di->lease_session == session) {
3391 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3392 h->seq = cpu_to_le32(di->lease_seq);
3393 __ceph_mdsc_drop_dentry_lease(dentry);
3394 }
3395 release = 1;
3396 break;
3397
3398 case CEPH_MDS_LEASE_RENEW:
3399 if (di->lease_session == session &&
3400 di->lease_gen == session->s_cap_gen &&
3401 di->lease_renew_from &&
3402 di->lease_renew_after == 0) {
3403 unsigned long duration =
3404 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
3405
3406 di->lease_seq = seq;
3407 di->time = di->lease_renew_from + duration;
3408 di->lease_renew_after = di->lease_renew_from +
3409 (duration >> 1);
3410 di->lease_renew_from = 0;
3411 }
3412 break;
3413 }
3414 spin_unlock(&dentry->d_lock);
3415 dput(dentry);
3416
3417 if (!release)
3418 goto out;
3419
3420 release:
3421 /* let's just reuse the same message */
3422 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3423 ceph_msg_get(msg);
3424 ceph_con_send(&session->s_con, msg);
3425
3426 out:
3427 iput(inode);
3428 mutex_unlock(&session->s_mutex);
3429 return;
3430
3431 bad:
3432 pr_err("corrupt lease message\n");
3433 ceph_msg_dump(msg);
3434 }
3435
3436 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3437 struct inode *inode,
3438 struct dentry *dentry, char action,
3439 u32 seq)
3440 {
3441 struct ceph_msg *msg;
3442 struct ceph_mds_lease *lease;
3443 int len = sizeof(*lease) + sizeof(u32);
3444 int dnamelen = 0;
3445
3446 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3447 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3448 dnamelen = dentry->d_name.len;
3449 len += dnamelen;
3450
3451 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
3452 if (!msg)
3453 return;
3454 lease = msg->front.iov_base;
3455 lease->action = action;
3456 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3457 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3458 lease->seq = cpu_to_le32(seq);
3459 put_unaligned_le32(dnamelen, lease + 1);
3460 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3461
3462 /*
3463 * if this is a preemptive lease RELEASE, no need to
3464 * flush request stream, since the actual request will
3465 * soon follow.
3466 */
3467 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3468
3469 ceph_con_send(&session->s_con, msg);
3470 }
3471
3472 /*
3473 * drop all leases (and dentry refs) in preparation for umount
3474 */
3475 static void drop_leases(struct ceph_mds_client *mdsc)
3476 {
3477 int i;
3478
3479 dout("drop_leases\n");
3480 mutex_lock(&mdsc->mutex);
3481 for (i = 0; i < mdsc->max_sessions; i++) {
3482 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3483 if (!s)
3484 continue;
3485 mutex_unlock(&mdsc->mutex);
3486 mutex_lock(&s->s_mutex);
3487 mutex_unlock(&s->s_mutex);
3488 ceph_put_mds_session(s);
3489 mutex_lock(&mdsc->mutex);
3490 }
3491 mutex_unlock(&mdsc->mutex);
3492 }
3493
3494
3495
3496 /*
3497 * delayed work -- periodically trim expired leases, renew caps with mds
3498 */
3499 static void schedule_delayed(struct ceph_mds_client *mdsc)
3500 {
3501 int delay = 5;
3502 unsigned hz = round_jiffies_relative(HZ * delay);
3503 schedule_delayed_work(&mdsc->delayed_work, hz);
3504 }
3505
3506 static void delayed_work(struct work_struct *work)
3507 {
3508 int i;
3509 struct ceph_mds_client *mdsc =
3510 container_of(work, struct ceph_mds_client, delayed_work.work);
3511 int renew_interval;
3512 int renew_caps;
3513
3514 dout("mdsc delayed_work\n");
3515 ceph_check_delayed_caps(mdsc);
3516
3517 mutex_lock(&mdsc->mutex);
3518 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3519 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3520 mdsc->last_renew_caps);
3521 if (renew_caps)
3522 mdsc->last_renew_caps = jiffies;
3523
3524 for (i = 0; i < mdsc->max_sessions; i++) {
3525 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3526 if (!s)
3527 continue;
3528 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3529 dout("resending session close request for mds%d\n",
3530 s->s_mds);
3531 request_close_session(mdsc, s);
3532 ceph_put_mds_session(s);
3533 continue;
3534 }
3535 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3536 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3537 s->s_state = CEPH_MDS_SESSION_HUNG;
3538 pr_info("mds%d hung\n", s->s_mds);
3539 }
3540 }
3541 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3542 /* this mds is failed or recovering, just wait */
3543 ceph_put_mds_session(s);
3544 continue;
3545 }
3546 mutex_unlock(&mdsc->mutex);
3547
3548 mutex_lock(&s->s_mutex);
3549 if (renew_caps)
3550 send_renew_caps(mdsc, s);
3551 else
3552 ceph_con_keepalive(&s->s_con);
3553 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3554 s->s_state == CEPH_MDS_SESSION_HUNG)
3555 ceph_send_cap_releases(mdsc, s);
3556 mutex_unlock(&s->s_mutex);
3557 ceph_put_mds_session(s);
3558
3559 mutex_lock(&mdsc->mutex);
3560 }
3561 mutex_unlock(&mdsc->mutex);
3562
3563 schedule_delayed(mdsc);
3564 }
3565
3566 int ceph_mdsc_init(struct ceph_fs_client *fsc)
3567
3568 {
3569 struct ceph_mds_client *mdsc;
3570
3571 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3572 if (!mdsc)
3573 return -ENOMEM;
3574 mdsc->fsc = fsc;
3575 fsc->mdsc = mdsc;
3576 mutex_init(&mdsc->mutex);
3577 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3578 if (!mdsc->mdsmap) {
3579 kfree(mdsc);
3580 return -ENOMEM;
3581 }
3582
3583 init_completion(&mdsc->safe_umount_waiters);
3584 init_waitqueue_head(&mdsc->session_close_wq);
3585 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3586 mdsc->sessions = NULL;
3587 atomic_set(&mdsc->num_sessions, 0);
3588 mdsc->max_sessions = 0;
3589 mdsc->stopping = 0;
3590 mdsc->last_snap_seq = 0;
3591 init_rwsem(&mdsc->snap_rwsem);
3592 mdsc->snap_realms = RB_ROOT;
3593 INIT_LIST_HEAD(&mdsc->snap_empty);
3594 spin_lock_init(&mdsc->snap_empty_lock);
3595 mdsc->last_tid = 0;
3596 mdsc->oldest_tid = 0;
3597 mdsc->request_tree = RB_ROOT;
3598 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3599 mdsc->last_renew_caps = jiffies;
3600 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3601 spin_lock_init(&mdsc->cap_delay_lock);
3602 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3603 spin_lock_init(&mdsc->snap_flush_lock);
3604 mdsc->last_cap_flush_tid = 1;
3605 INIT_LIST_HEAD(&mdsc->cap_flush_list);
3606 INIT_LIST_HEAD(&mdsc->cap_dirty);
3607 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3608 mdsc->num_cap_flushing = 0;
3609 spin_lock_init(&mdsc->cap_dirty_lock);
3610 init_waitqueue_head(&mdsc->cap_flushing_wq);
3611 spin_lock_init(&mdsc->dentry_lru_lock);
3612 INIT_LIST_HEAD(&mdsc->dentry_lru);
3613
3614 ceph_caps_init(mdsc);
3615 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3616
3617 init_rwsem(&mdsc->pool_perm_rwsem);
3618 mdsc->pool_perm_tree = RB_ROOT;
3619
3620 strncpy(mdsc->nodename, utsname()->nodename,
3621 sizeof(mdsc->nodename) - 1);
3622 return 0;
3623 }
3624
3625 /*
3626 * Wait for safe replies on open mds requests. If we time out, drop
3627 * all requests from the tree to avoid dangling dentry refs.
3628 */
3629 static void wait_requests(struct ceph_mds_client *mdsc)
3630 {
3631 struct ceph_options *opts = mdsc->fsc->client->options;
3632 struct ceph_mds_request *req;
3633
3634 mutex_lock(&mdsc->mutex);
3635 if (__get_oldest_req(mdsc)) {
3636 mutex_unlock(&mdsc->mutex);
3637
3638 dout("wait_requests waiting for requests\n");
3639 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3640 ceph_timeout_jiffies(opts->mount_timeout));
3641
3642 /* tear down remaining requests */
3643 mutex_lock(&mdsc->mutex);
3644 while ((req = __get_oldest_req(mdsc))) {
3645 dout("wait_requests timed out on tid %llu\n",
3646 req->r_tid);
3647 __unregister_request(mdsc, req);
3648 }
3649 }
3650 mutex_unlock(&mdsc->mutex);
3651 dout("wait_requests done\n");
3652 }
3653
3654 /*
3655 * called before mount is ro, and before dentries are torn down.
3656 * (hmm, does this still race with new lookups?)
3657 */
3658 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3659 {
3660 dout("pre_umount\n");
3661 mdsc->stopping = 1;
3662
3663 drop_leases(mdsc);
3664 ceph_flush_dirty_caps(mdsc);
3665 wait_requests(mdsc);
3666
3667 /*
3668 * wait for reply handlers to drop their request refs and
3669 * their inode/dcache refs
3670 */
3671 ceph_msgr_flush();
3672 }
3673
3674 /*
3675 * wait for all write mds requests to flush.
3676 */
3677 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3678 {
3679 struct ceph_mds_request *req = NULL, *nextreq;
3680 struct rb_node *n;
3681
3682 mutex_lock(&mdsc->mutex);
3683 dout("wait_unsafe_requests want %lld\n", want_tid);
3684 restart:
3685 req = __get_oldest_req(mdsc);
3686 while (req && req->r_tid <= want_tid) {
3687 /* find next request */
3688 n = rb_next(&req->r_node);
3689 if (n)
3690 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3691 else
3692 nextreq = NULL;
3693 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3694 (req->r_op & CEPH_MDS_OP_WRITE)) {
3695 /* write op */
3696 ceph_mdsc_get_request(req);
3697 if (nextreq)
3698 ceph_mdsc_get_request(nextreq);
3699 mutex_unlock(&mdsc->mutex);
3700 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3701 req->r_tid, want_tid);
3702 wait_for_completion(&req->r_safe_completion);
3703 mutex_lock(&mdsc->mutex);
3704 ceph_mdsc_put_request(req);
3705 if (!nextreq)
3706 break; /* next dne before, so we're done! */
3707 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3708 /* next request was removed from tree */
3709 ceph_mdsc_put_request(nextreq);
3710 goto restart;
3711 }
3712 ceph_mdsc_put_request(nextreq); /* won't go away */
3713 }
3714 req = nextreq;
3715 }
3716 mutex_unlock(&mdsc->mutex);
3717 dout("wait_unsafe_requests done\n");
3718 }
3719
3720 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3721 {
3722 u64 want_tid, want_flush;
3723
3724 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3725 return;
3726
3727 dout("sync\n");
3728 mutex_lock(&mdsc->mutex);
3729 want_tid = mdsc->last_tid;
3730 mutex_unlock(&mdsc->mutex);
3731
3732 ceph_flush_dirty_caps(mdsc);
3733 spin_lock(&mdsc->cap_dirty_lock);
3734 want_flush = mdsc->last_cap_flush_tid;
3735 if (!list_empty(&mdsc->cap_flush_list)) {
3736 struct ceph_cap_flush *cf =
3737 list_last_entry(&mdsc->cap_flush_list,
3738 struct ceph_cap_flush, g_list);
3739 cf->wake = true;
3740 }
3741 spin_unlock(&mdsc->cap_dirty_lock);
3742
3743 dout("sync want tid %lld flush_seq %lld\n",
3744 want_tid, want_flush);
3745
3746 wait_unsafe_requests(mdsc, want_tid);
3747 wait_caps_flush(mdsc, want_flush);
3748 }
3749
3750 /*
3751 * true if all sessions are closed, or we force unmount
3752 */
3753 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
3754 {
3755 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3756 return true;
3757 return atomic_read(&mdsc->num_sessions) <= skipped;
3758 }
3759
3760 /*
3761 * called after sb is ro.
3762 */
3763 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3764 {
3765 struct ceph_options *opts = mdsc->fsc->client->options;
3766 struct ceph_mds_session *session;
3767 int i;
3768 int skipped = 0;
3769
3770 dout("close_sessions\n");
3771
3772 /* close sessions */
3773 mutex_lock(&mdsc->mutex);
3774 for (i = 0; i < mdsc->max_sessions; i++) {
3775 session = __ceph_lookup_mds_session(mdsc, i);
3776 if (!session)
3777 continue;
3778 mutex_unlock(&mdsc->mutex);
3779 mutex_lock(&session->s_mutex);
3780 if (__close_session(mdsc, session) <= 0)
3781 skipped++;
3782 mutex_unlock(&session->s_mutex);
3783 ceph_put_mds_session(session);
3784 mutex_lock(&mdsc->mutex);
3785 }
3786 mutex_unlock(&mdsc->mutex);
3787
3788 dout("waiting for sessions to close\n");
3789 wait_event_timeout(mdsc->session_close_wq,
3790 done_closing_sessions(mdsc, skipped),
3791 ceph_timeout_jiffies(opts->mount_timeout));
3792
3793 /* tear down remaining sessions */
3794 mutex_lock(&mdsc->mutex);
3795 for (i = 0; i < mdsc->max_sessions; i++) {
3796 if (mdsc->sessions[i]) {
3797 session = get_session(mdsc->sessions[i]);
3798 __unregister_session(mdsc, session);
3799 mutex_unlock(&mdsc->mutex);
3800 mutex_lock(&session->s_mutex);
3801 remove_session_caps(session);
3802 mutex_unlock(&session->s_mutex);
3803 ceph_put_mds_session(session);
3804 mutex_lock(&mdsc->mutex);
3805 }
3806 }
3807 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3808 mutex_unlock(&mdsc->mutex);
3809
3810 ceph_cleanup_empty_realms(mdsc);
3811
3812 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3813
3814 dout("stopped\n");
3815 }
3816
3817 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3818 {
3819 struct ceph_mds_session *session;
3820 int mds;
3821
3822 dout("force umount\n");
3823
3824 mutex_lock(&mdsc->mutex);
3825 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3826 session = __ceph_lookup_mds_session(mdsc, mds);
3827 if (!session)
3828 continue;
3829 mutex_unlock(&mdsc->mutex);
3830 mutex_lock(&session->s_mutex);
3831 __close_session(mdsc, session);
3832 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3833 cleanup_session_requests(mdsc, session);
3834 remove_session_caps(session);
3835 }
3836 mutex_unlock(&session->s_mutex);
3837 ceph_put_mds_session(session);
3838 mutex_lock(&mdsc->mutex);
3839 kick_requests(mdsc, mds);
3840 }
3841 __wake_requests(mdsc, &mdsc->waiting_for_map);
3842 mutex_unlock(&mdsc->mutex);
3843 }
3844
3845 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3846 {
3847 dout("stop\n");
3848 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3849 if (mdsc->mdsmap)
3850 ceph_mdsmap_destroy(mdsc->mdsmap);
3851 kfree(mdsc->sessions);
3852 ceph_caps_finalize(mdsc);
3853 ceph_pool_perm_destroy(mdsc);
3854 }
3855
3856 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3857 {
3858 struct ceph_mds_client *mdsc = fsc->mdsc;
3859 dout("mdsc_destroy %p\n", mdsc);
3860
3861 /* flush out any connection work with references to us */
3862 ceph_msgr_flush();
3863
3864 ceph_mdsc_stop(mdsc);
3865
3866 fsc->mdsc = NULL;
3867 kfree(mdsc);
3868 dout("mdsc_destroy %p done\n", mdsc);
3869 }
3870
3871 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3872 {
3873 struct ceph_fs_client *fsc = mdsc->fsc;
3874 const char *mds_namespace = fsc->mount_options->mds_namespace;
3875 void *p = msg->front.iov_base;
3876 void *end = p + msg->front.iov_len;
3877 u32 epoch;
3878 u32 map_len;
3879 u32 num_fs;
3880 u32 mount_fscid = (u32)-1;
3881 u8 struct_v, struct_cv;
3882 int err = -EINVAL;
3883
3884 ceph_decode_need(&p, end, sizeof(u32), bad);
3885 epoch = ceph_decode_32(&p);
3886
3887 dout("handle_fsmap epoch %u\n", epoch);
3888
3889 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3890 struct_v = ceph_decode_8(&p);
3891 struct_cv = ceph_decode_8(&p);
3892 map_len = ceph_decode_32(&p);
3893
3894 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
3895 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
3896
3897 num_fs = ceph_decode_32(&p);
3898 while (num_fs-- > 0) {
3899 void *info_p, *info_end;
3900 u32 info_len;
3901 u8 info_v, info_cv;
3902 u32 fscid, namelen;
3903
3904 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3905 info_v = ceph_decode_8(&p);
3906 info_cv = ceph_decode_8(&p);
3907 info_len = ceph_decode_32(&p);
3908 ceph_decode_need(&p, end, info_len, bad);
3909 info_p = p;
3910 info_end = p + info_len;
3911 p = info_end;
3912
3913 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
3914 fscid = ceph_decode_32(&info_p);
3915 namelen = ceph_decode_32(&info_p);
3916 ceph_decode_need(&info_p, info_end, namelen, bad);
3917
3918 if (mds_namespace &&
3919 strlen(mds_namespace) == namelen &&
3920 !strncmp(mds_namespace, (char *)info_p, namelen)) {
3921 mount_fscid = fscid;
3922 break;
3923 }
3924 }
3925
3926 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
3927 if (mount_fscid != (u32)-1) {
3928 fsc->client->monc.fs_cluster_id = mount_fscid;
3929 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
3930 0, true);
3931 ceph_monc_renew_subs(&fsc->client->monc);
3932 } else {
3933 err = -ENOENT;
3934 goto err_out;
3935 }
3936 return;
3937
3938 bad:
3939 pr_err("error decoding fsmap\n");
3940 err_out:
3941 mutex_lock(&mdsc->mutex);
3942 mdsc->mdsmap_err = err;
3943 __wake_requests(mdsc, &mdsc->waiting_for_map);
3944 mutex_unlock(&mdsc->mutex);
3945 }
3946
3947 /*
3948 * handle mds map update.
3949 */
3950 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3951 {
3952 u32 epoch;
3953 u32 maplen;
3954 void *p = msg->front.iov_base;
3955 void *end = p + msg->front.iov_len;
3956 struct ceph_mdsmap *newmap, *oldmap;
3957 struct ceph_fsid fsid;
3958 int err = -EINVAL;
3959
3960 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3961 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3962 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3963 return;
3964 epoch = ceph_decode_32(&p);
3965 maplen = ceph_decode_32(&p);
3966 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3967
3968 /* do we need it? */
3969 mutex_lock(&mdsc->mutex);
3970 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3971 dout("handle_map epoch %u <= our %u\n",
3972 epoch, mdsc->mdsmap->m_epoch);
3973 mutex_unlock(&mdsc->mutex);
3974 return;
3975 }
3976
3977 newmap = ceph_mdsmap_decode(&p, end);
3978 if (IS_ERR(newmap)) {
3979 err = PTR_ERR(newmap);
3980 goto bad_unlock;
3981 }
3982
3983 /* swap into place */
3984 if (mdsc->mdsmap) {
3985 oldmap = mdsc->mdsmap;
3986 mdsc->mdsmap = newmap;
3987 check_new_map(mdsc, newmap, oldmap);
3988 ceph_mdsmap_destroy(oldmap);
3989 } else {
3990 mdsc->mdsmap = newmap; /* first mds map */
3991 }
3992 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3993
3994 __wake_requests(mdsc, &mdsc->waiting_for_map);
3995 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
3996 mdsc->mdsmap->m_epoch);
3997
3998 mutex_unlock(&mdsc->mutex);
3999 schedule_delayed(mdsc);
4000 return;
4001
4002 bad_unlock:
4003 mutex_unlock(&mdsc->mutex);
4004 bad:
4005 pr_err("error decoding mdsmap %d\n", err);
4006 return;
4007 }
4008
4009 static struct ceph_connection *con_get(struct ceph_connection *con)
4010 {
4011 struct ceph_mds_session *s = con->private;
4012
4013 if (get_session(s)) {
4014 dout("mdsc con_get %p ok (%d)\n", s, refcount_read(&s->s_ref));
4015 return con;
4016 }
4017 dout("mdsc con_get %p FAIL\n", s);
4018 return NULL;
4019 }
4020
4021 static void con_put(struct ceph_connection *con)
4022 {
4023 struct ceph_mds_session *s = con->private;
4024
4025 dout("mdsc con_put %p (%d)\n", s, refcount_read(&s->s_ref) - 1);
4026 ceph_put_mds_session(s);
4027 }
4028
4029 /*
4030 * if the client is unresponsive for long enough, the mds will kill
4031 * the session entirely.
4032 */
4033 static void peer_reset(struct ceph_connection *con)
4034 {
4035 struct ceph_mds_session *s = con->private;
4036 struct ceph_mds_client *mdsc = s->s_mdsc;
4037
4038 pr_warn("mds%d closed our session\n", s->s_mds);
4039 send_mds_reconnect(mdsc, s);
4040 }
4041
4042 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
4043 {
4044 struct ceph_mds_session *s = con->private;
4045 struct ceph_mds_client *mdsc = s->s_mdsc;
4046 int type = le16_to_cpu(msg->hdr.type);
4047
4048 mutex_lock(&mdsc->mutex);
4049 if (__verify_registered_session(mdsc, s) < 0) {
4050 mutex_unlock(&mdsc->mutex);
4051 goto out;
4052 }
4053 mutex_unlock(&mdsc->mutex);
4054
4055 switch (type) {
4056 case CEPH_MSG_MDS_MAP:
4057 ceph_mdsc_handle_mdsmap(mdsc, msg);
4058 break;
4059 case CEPH_MSG_FS_MAP_USER:
4060 ceph_mdsc_handle_fsmap(mdsc, msg);
4061 break;
4062 case CEPH_MSG_CLIENT_SESSION:
4063 handle_session(s, msg);
4064 break;
4065 case CEPH_MSG_CLIENT_REPLY:
4066 handle_reply(s, msg);
4067 break;
4068 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
4069 handle_forward(mdsc, s, msg);
4070 break;
4071 case CEPH_MSG_CLIENT_CAPS:
4072 ceph_handle_caps(s, msg);
4073 break;
4074 case CEPH_MSG_CLIENT_SNAP:
4075 ceph_handle_snap(mdsc, s, msg);
4076 break;
4077 case CEPH_MSG_CLIENT_LEASE:
4078 handle_lease(mdsc, s, msg);
4079 break;
4080
4081 default:
4082 pr_err("received unknown message type %d %s\n", type,
4083 ceph_msg_type_name(type));
4084 }
4085 out:
4086 ceph_msg_put(msg);
4087 }
4088
4089 /*
4090 * authentication
4091 */
4092
4093 /*
4094 * Note: returned pointer is the address of a structure that's
4095 * managed separately. Caller must *not* attempt to free it.
4096 */
4097 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
4098 int *proto, int force_new)
4099 {
4100 struct ceph_mds_session *s = con->private;
4101 struct ceph_mds_client *mdsc = s->s_mdsc;
4102 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4103 struct ceph_auth_handshake *auth = &s->s_auth;
4104
4105 if (force_new && auth->authorizer) {
4106 ceph_auth_destroy_authorizer(auth->authorizer);
4107 auth->authorizer = NULL;
4108 }
4109 if (!auth->authorizer) {
4110 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4111 auth);
4112 if (ret)
4113 return ERR_PTR(ret);
4114 } else {
4115 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4116 auth);
4117 if (ret)
4118 return ERR_PTR(ret);
4119 }
4120 *proto = ac->protocol;
4121
4122 return auth;
4123 }
4124
4125
4126 static int verify_authorizer_reply(struct ceph_connection *con)
4127 {
4128 struct ceph_mds_session *s = con->private;
4129 struct ceph_mds_client *mdsc = s->s_mdsc;
4130 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4131
4132 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
4133 }
4134
4135 static int invalidate_authorizer(struct ceph_connection *con)
4136 {
4137 struct ceph_mds_session *s = con->private;
4138 struct ceph_mds_client *mdsc = s->s_mdsc;
4139 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4140
4141 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
4142
4143 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
4144 }
4145
4146 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
4147 struct ceph_msg_header *hdr, int *skip)
4148 {
4149 struct ceph_msg *msg;
4150 int type = (int) le16_to_cpu(hdr->type);
4151 int front_len = (int) le32_to_cpu(hdr->front_len);
4152
4153 if (con->in_msg)
4154 return con->in_msg;
4155
4156 *skip = 0;
4157 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
4158 if (!msg) {
4159 pr_err("unable to allocate msg type %d len %d\n",
4160 type, front_len);
4161 return NULL;
4162 }
4163
4164 return msg;
4165 }
4166
4167 static int mds_sign_message(struct ceph_msg *msg)
4168 {
4169 struct ceph_mds_session *s = msg->con->private;
4170 struct ceph_auth_handshake *auth = &s->s_auth;
4171
4172 return ceph_auth_sign_message(auth, msg);
4173 }
4174
4175 static int mds_check_message_signature(struct ceph_msg *msg)
4176 {
4177 struct ceph_mds_session *s = msg->con->private;
4178 struct ceph_auth_handshake *auth = &s->s_auth;
4179
4180 return ceph_auth_check_message_signature(auth, msg);
4181 }
4182
4183 static const struct ceph_connection_operations mds_con_ops = {
4184 .get = con_get,
4185 .put = con_put,
4186 .dispatch = dispatch,
4187 .get_authorizer = get_authorizer,
4188 .verify_authorizer_reply = verify_authorizer_reply,
4189 .invalidate_authorizer = invalidate_authorizer,
4190 .peer_reset = peer_reset,
4191 .alloc_msg = mds_alloc_msg,
4192 .sign_message = mds_sign_message,
4193 .check_message_signature = mds_check_message_signature,
4194 };
4195
4196 /* eof */
CRIS linux kernel tree