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Merge tag 'linux-kselftest-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel...
[linux/fpc-iii.git] / fs / ceph / mds_client.c
blob0687ab3c32674d863213186dc4554d17ad219bf3
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45 * are no longer valid.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 req->r_tid = ++mdsc->last_tid;
608 if (req->r_num_caps)
609 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
610 req->r_num_caps);
611 dout("__register_request %p tid %lld\n", req, req->r_tid);
612 ceph_mdsc_get_request(req);
613 insert_request(&mdsc->request_tree, req);
614
615 req->r_uid = current_fsuid();
616 req->r_gid = current_fsgid();
617
618 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
619 mdsc->oldest_tid = req->r_tid;
620
621 if (dir) {
622 ihold(dir);
623 req->r_unsafe_dir = dir;
624 }
625 }
626
627 static void __unregister_request(struct ceph_mds_client *mdsc,
628 struct ceph_mds_request *req)
629 {
630 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
631
632 /* Never leave an unregistered request on an unsafe list! */
633 list_del_init(&req->r_unsafe_item);
634
635 if (req->r_tid == mdsc->oldest_tid) {
636 struct rb_node *p = rb_next(&req->r_node);
637 mdsc->oldest_tid = 0;
638 while (p) {
639 struct ceph_mds_request *next_req =
640 rb_entry(p, struct ceph_mds_request, r_node);
641 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
642 mdsc->oldest_tid = next_req->r_tid;
643 break;
644 }
645 p = rb_next(p);
646 }
647 }
648
649 erase_request(&mdsc->request_tree, req);
650
651 if (req->r_unsafe_dir &&
652 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
653 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
654 spin_lock(&ci->i_unsafe_lock);
655 list_del_init(&req->r_unsafe_dir_item);
656 spin_unlock(&ci->i_unsafe_lock);
657 }
658 if (req->r_target_inode &&
659 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
660 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
661 spin_lock(&ci->i_unsafe_lock);
662 list_del_init(&req->r_unsafe_target_item);
663 spin_unlock(&ci->i_unsafe_lock);
664 }
665
666 if (req->r_unsafe_dir) {
667 iput(req->r_unsafe_dir);
668 req->r_unsafe_dir = NULL;
669 }
670
671 complete_all(&req->r_safe_completion);
672
673 ceph_mdsc_put_request(req);
674 }
675
676 /*
677 * Walk back up the dentry tree until we hit a dentry representing a
678 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
679 * when calling this) to ensure that the objects won't disappear while we're
680 * working with them. Once we hit a candidate dentry, we attempt to take a
681 * reference to it, and return that as the result.
682 */
683 static struct inode *get_nonsnap_parent(struct dentry *dentry)
684 {
685 struct inode *inode = NULL;
686
687 while (dentry && !IS_ROOT(dentry)) {
688 inode = d_inode_rcu(dentry);
689 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
690 break;
691 dentry = dentry->d_parent;
692 }
693 if (inode)
694 inode = igrab(inode);
695 return inode;
696 }
697
698 /*
699 * Choose mds to send request to next. If there is a hint set in the
700 * request (e.g., due to a prior forward hint from the mds), use that.
701 * Otherwise, consult frag tree and/or caps to identify the
702 * appropriate mds. If all else fails, choose randomly.
703 *
704 * Called under mdsc->mutex.
705 */
706 static int __choose_mds(struct ceph_mds_client *mdsc,
707 struct ceph_mds_request *req)
708 {
709 struct inode *inode;
710 struct ceph_inode_info *ci;
711 struct ceph_cap *cap;
712 int mode = req->r_direct_mode;
713 int mds = -1;
714 u32 hash = req->r_direct_hash;
715 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
716
717 /*
718 * is there a specific mds we should try? ignore hint if we have
719 * no session and the mds is not up (active or recovering).
720 */
721 if (req->r_resend_mds >= 0 &&
722 (__have_session(mdsc, req->r_resend_mds) ||
723 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
724 dout("choose_mds using resend_mds mds%d\n",
725 req->r_resend_mds);
726 return req->r_resend_mds;
727 }
728
729 if (mode == USE_RANDOM_MDS)
730 goto random;
731
732 inode = NULL;
733 if (req->r_inode) {
734 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
735 inode = req->r_inode;
736 ihold(inode);
737 } else {
738 /* req->r_dentry is non-null for LSSNAP request */
739 rcu_read_lock();
740 inode = get_nonsnap_parent(req->r_dentry);
741 rcu_read_unlock();
742 dout("__choose_mds using snapdir's parent %p\n", inode);
743 }
744 } else if (req->r_dentry) {
745 /* ignore race with rename; old or new d_parent is okay */
746 struct dentry *parent;
747 struct inode *dir;
748
749 rcu_read_lock();
750 parent = req->r_dentry->d_parent;
751 dir = req->r_parent ? : d_inode_rcu(parent);
752
753 if (!dir || dir->i_sb != mdsc->fsc->sb) {
754 /* not this fs or parent went negative */
755 inode = d_inode(req->r_dentry);
756 if (inode)
757 ihold(inode);
758 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
759 /* direct snapped/virtual snapdir requests
760 * based on parent dir inode */
761 inode = get_nonsnap_parent(parent);
762 dout("__choose_mds using nonsnap parent %p\n", inode);
763 } else {
764 /* dentry target */
765 inode = d_inode(req->r_dentry);
766 if (!inode || mode == USE_AUTH_MDS) {
767 /* dir + name */
768 inode = igrab(dir);
769 hash = ceph_dentry_hash(dir, req->r_dentry);
770 is_hash = true;
771 } else {
772 ihold(inode);
773 }
774 }
775 rcu_read_unlock();
776 }
777
778 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
779 (int)hash, mode);
780 if (!inode)
781 goto random;
782 ci = ceph_inode(inode);
783
784 if (is_hash && S_ISDIR(inode->i_mode)) {
785 struct ceph_inode_frag frag;
786 int found;
787
788 ceph_choose_frag(ci, hash, &frag, &found);
789 if (found) {
790 if (mode == USE_ANY_MDS && frag.ndist > 0) {
791 u8 r;
792
793 /* choose a random replica */
794 get_random_bytes(&r, 1);
795 r %= frag.ndist;
796 mds = frag.dist[r];
797 dout("choose_mds %p %llx.%llx "
798 "frag %u mds%d (%d/%d)\n",
799 inode, ceph_vinop(inode),
800 frag.frag, mds,
801 (int)r, frag.ndist);
802 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
803 CEPH_MDS_STATE_ACTIVE)
804 goto out;
805 }
806
807 /* since this file/dir wasn't known to be
808 * replicated, then we want to look for the
809 * authoritative mds. */
810 mode = USE_AUTH_MDS;
811 if (frag.mds >= 0) {
812 /* choose auth mds */
813 mds = frag.mds;
814 dout("choose_mds %p %llx.%llx "
815 "frag %u mds%d (auth)\n",
816 inode, ceph_vinop(inode), frag.frag, mds);
817 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
818 CEPH_MDS_STATE_ACTIVE)
819 goto out;
820 }
821 }
822 }
823
824 spin_lock(&ci->i_ceph_lock);
825 cap = NULL;
826 if (mode == USE_AUTH_MDS)
827 cap = ci->i_auth_cap;
828 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
829 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
830 if (!cap) {
831 spin_unlock(&ci->i_ceph_lock);
832 iput(inode);
833 goto random;
834 }
835 mds = cap->session->s_mds;
836 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
837 inode, ceph_vinop(inode), mds,
838 cap == ci->i_auth_cap ? "auth " : "", cap);
839 spin_unlock(&ci->i_ceph_lock);
840 out:
841 iput(inode);
842 return mds;
843
844 random:
845 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
846 dout("choose_mds chose random mds%d\n", mds);
847 return mds;
848 }
849
850
851 /*
852 * session messages
853 */
854 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
855 {
856 struct ceph_msg *msg;
857 struct ceph_mds_session_head *h;
858
859 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
860 false);
861 if (!msg) {
862 pr_err("create_session_msg ENOMEM creating msg\n");
863 return NULL;
864 }
865 h = msg->front.iov_base;
866 h->op = cpu_to_le32(op);
867 h->seq = cpu_to_le64(seq);
868
869 return msg;
870 }
871
872 /*
873 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
874 * to include additional client metadata fields.
875 */
876 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
877 {
878 struct ceph_msg *msg;
879 struct ceph_mds_session_head *h;
880 int i = -1;
881 int metadata_bytes = 0;
882 int metadata_key_count = 0;
883 struct ceph_options *opt = mdsc->fsc->client->options;
884 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
885 void *p;
886
887 const char* metadata[][2] = {
888 {"hostname", mdsc->nodename},
889 {"kernel_version", init_utsname()->release},
890 {"entity_id", opt->name ? : ""},
891 {"root", fsopt->server_path ? : "/"},
892 {NULL, NULL}
893 };
894
895 /* Calculate serialized length of metadata */
896 metadata_bytes = 4; /* map length */
897 for (i = 0; metadata[i][0]; ++i) {
898 metadata_bytes += 8 + strlen(metadata[i][0]) +
899 strlen(metadata[i][1]);
900 metadata_key_count++;
901 }
902
903 /* Allocate the message */
904 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
905 GFP_NOFS, false);
906 if (!msg) {
907 pr_err("create_session_msg ENOMEM creating msg\n");
908 return NULL;
909 }
910 h = msg->front.iov_base;
911 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
912 h->seq = cpu_to_le64(seq);
913
914 /*
915 * Serialize client metadata into waiting buffer space, using
916 * the format that userspace expects for map<string, string>
917 *
918 * ClientSession messages with metadata are v2
919 */
920 msg->hdr.version = cpu_to_le16(2);
921 msg->hdr.compat_version = cpu_to_le16(1);
922
923 /* The write pointer, following the session_head structure */
924 p = msg->front.iov_base + sizeof(*h);
925
926 /* Number of entries in the map */
927 ceph_encode_32(&p, metadata_key_count);
928
929 /* Two length-prefixed strings for each entry in the map */
930 for (i = 0; metadata[i][0]; ++i) {
931 size_t const key_len = strlen(metadata[i][0]);
932 size_t const val_len = strlen(metadata[i][1]);
933
934 ceph_encode_32(&p, key_len);
935 memcpy(p, metadata[i][0], key_len);
936 p += key_len;
937 ceph_encode_32(&p, val_len);
938 memcpy(p, metadata[i][1], val_len);
939 p += val_len;
940 }
941
942 return msg;
943 }
944
945 /*
946 * send session open request.
947 *
948 * called under mdsc->mutex
949 */
950 static int __open_session(struct ceph_mds_client *mdsc,
951 struct ceph_mds_session *session)
952 {
953 struct ceph_msg *msg;
954 int mstate;
955 int mds = session->s_mds;
956
957 /* wait for mds to go active? */
958 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
959 dout("open_session to mds%d (%s)\n", mds,
960 ceph_mds_state_name(mstate));
961 session->s_state = CEPH_MDS_SESSION_OPENING;
962 session->s_renew_requested = jiffies;
963
964 /* send connect message */
965 msg = create_session_open_msg(mdsc, session->s_seq);
966 if (!msg)
967 return -ENOMEM;
968 ceph_con_send(&session->s_con, msg);
969 return 0;
970 }
971
972 /*
973 * open sessions for any export targets for the given mds
974 *
975 * called under mdsc->mutex
976 */
977 static struct ceph_mds_session *
978 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
979 {
980 struct ceph_mds_session *session;
981
982 session = __ceph_lookup_mds_session(mdsc, target);
983 if (!session) {
984 session = register_session(mdsc, target);
985 if (IS_ERR(session))
986 return session;
987 }
988 if (session->s_state == CEPH_MDS_SESSION_NEW ||
989 session->s_state == CEPH_MDS_SESSION_CLOSING)
990 __open_session(mdsc, session);
991
992 return session;
993 }
994
995 struct ceph_mds_session *
996 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
997 {
998 struct ceph_mds_session *session;
999
1000 dout("open_export_target_session to mds%d\n", target);
1001
1002 mutex_lock(&mdsc->mutex);
1003 session = __open_export_target_session(mdsc, target);
1004 mutex_unlock(&mdsc->mutex);
1005
1006 return session;
1007 }
1008
1009 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1010 struct ceph_mds_session *session)
1011 {
1012 struct ceph_mds_info *mi;
1013 struct ceph_mds_session *ts;
1014 int i, mds = session->s_mds;
1015
1016 if (mds >= mdsc->mdsmap->m_num_mds)
1017 return;
1018
1019 mi = &mdsc->mdsmap->m_info[mds];
1020 dout("open_export_target_sessions for mds%d (%d targets)\n",
1021 session->s_mds, mi->num_export_targets);
1022
1023 for (i = 0; i < mi->num_export_targets; i++) {
1024 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1025 if (!IS_ERR(ts))
1026 ceph_put_mds_session(ts);
1027 }
1028 }
1029
1030 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1031 struct ceph_mds_session *session)
1032 {
1033 mutex_lock(&mdsc->mutex);
1034 __open_export_target_sessions(mdsc, session);
1035 mutex_unlock(&mdsc->mutex);
1036 }
1037
1038 /*
1039 * session caps
1040 */
1041
1042 /* caller holds s_cap_lock, we drop it */
1043 static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
1044 struct ceph_mds_session *session)
1045 __releases(session->s_cap_lock)
1046 {
1047 LIST_HEAD(tmp_list);
1048 list_splice_init(&session->s_cap_releases, &tmp_list);
1049 session->s_num_cap_releases = 0;
1050 spin_unlock(&session->s_cap_lock);
1051
1052 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1053 while (!list_empty(&tmp_list)) {
1054 struct ceph_cap *cap;
1055 /* zero out the in-progress message */
1056 cap = list_first_entry(&tmp_list,
1057 struct ceph_cap, session_caps);
1058 list_del(&cap->session_caps);
1059 ceph_put_cap(mdsc, cap);
1060 }
1061 }
1062
1063 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1064 struct ceph_mds_session *session)
1065 {
1066 struct ceph_mds_request *req;
1067 struct rb_node *p;
1068
1069 dout("cleanup_session_requests mds%d\n", session->s_mds);
1070 mutex_lock(&mdsc->mutex);
1071 while (!list_empty(&session->s_unsafe)) {
1072 req = list_first_entry(&session->s_unsafe,
1073 struct ceph_mds_request, r_unsafe_item);
1074 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1075 req->r_tid);
1076 __unregister_request(mdsc, req);
1077 }
1078 /* zero r_attempts, so kick_requests() will re-send requests */
1079 p = rb_first(&mdsc->request_tree);
1080 while (p) {
1081 req = rb_entry(p, struct ceph_mds_request, r_node);
1082 p = rb_next(p);
1083 if (req->r_session &&
1084 req->r_session->s_mds == session->s_mds)
1085 req->r_attempts = 0;
1086 }
1087 mutex_unlock(&mdsc->mutex);
1088 }
1089
1090 /*
1091 * Helper to safely iterate over all caps associated with a session, with
1092 * special care taken to handle a racing __ceph_remove_cap().
1093 *
1094 * Caller must hold session s_mutex.
1095 */
1096 static int iterate_session_caps(struct ceph_mds_session *session,
1097 int (*cb)(struct inode *, struct ceph_cap *,
1098 void *), void *arg)
1099 {
1100 struct list_head *p;
1101 struct ceph_cap *cap;
1102 struct inode *inode, *last_inode = NULL;
1103 struct ceph_cap *old_cap = NULL;
1104 int ret;
1105
1106 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1107 spin_lock(&session->s_cap_lock);
1108 p = session->s_caps.next;
1109 while (p != &session->s_caps) {
1110 cap = list_entry(p, struct ceph_cap, session_caps);
1111 inode = igrab(&cap->ci->vfs_inode);
1112 if (!inode) {
1113 p = p->next;
1114 continue;
1115 }
1116 session->s_cap_iterator = cap;
1117 spin_unlock(&session->s_cap_lock);
1118
1119 if (last_inode) {
1120 iput(last_inode);
1121 last_inode = NULL;
1122 }
1123 if (old_cap) {
1124 ceph_put_cap(session->s_mdsc, old_cap);
1125 old_cap = NULL;
1126 }
1127
1128 ret = cb(inode, cap, arg);
1129 last_inode = inode;
1130
1131 spin_lock(&session->s_cap_lock);
1132 p = p->next;
1133 if (!cap->ci) {
1134 dout("iterate_session_caps finishing cap %p removal\n",
1135 cap);
1136 BUG_ON(cap->session != session);
1137 cap->session = NULL;
1138 list_del_init(&cap->session_caps);
1139 session->s_nr_caps--;
1140 if (cap->queue_release) {
1141 list_add_tail(&cap->session_caps,
1142 &session->s_cap_releases);
1143 session->s_num_cap_releases++;
1144 } else {
1145 old_cap = cap; /* put_cap it w/o locks held */
1146 }
1147 }
1148 if (ret < 0)
1149 goto out;
1150 }
1151 ret = 0;
1152 out:
1153 session->s_cap_iterator = NULL;
1154 spin_unlock(&session->s_cap_lock);
1155
1156 iput(last_inode);
1157 if (old_cap)
1158 ceph_put_cap(session->s_mdsc, old_cap);
1159
1160 return ret;
1161 }
1162
1163 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1164 void *arg)
1165 {
1166 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
1167 struct ceph_inode_info *ci = ceph_inode(inode);
1168 LIST_HEAD(to_remove);
1169 bool drop = false;
1170 bool invalidate = false;
1171
1172 dout("removing cap %p, ci is %p, inode is %p\n",
1173 cap, ci, &ci->vfs_inode);
1174 spin_lock(&ci->i_ceph_lock);
1175 __ceph_remove_cap(cap, false);
1176 if (!ci->i_auth_cap) {
1177 struct ceph_cap_flush *cf;
1178 struct ceph_mds_client *mdsc = fsc->mdsc;
1179
1180 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1181
1182 if (ci->i_wrbuffer_ref > 0 &&
1183 READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
1184 invalidate = true;
1185
1186 while (!list_empty(&ci->i_cap_flush_list)) {
1187 cf = list_first_entry(&ci->i_cap_flush_list,
1188 struct ceph_cap_flush, i_list);
1189 list_move(&cf->i_list, &to_remove);
1190 }
1191
1192 spin_lock(&mdsc->cap_dirty_lock);
1193
1194 list_for_each_entry(cf, &to_remove, i_list)
1195 list_del(&cf->g_list);
1196
1197 if (!list_empty(&ci->i_dirty_item)) {
1198 pr_warn_ratelimited(
1199 " dropping dirty %s state for %p %lld\n",
1200 ceph_cap_string(ci->i_dirty_caps),
1201 inode, ceph_ino(inode));
1202 ci->i_dirty_caps = 0;
1203 list_del_init(&ci->i_dirty_item);
1204 drop = true;
1205 }
1206 if (!list_empty(&ci->i_flushing_item)) {
1207 pr_warn_ratelimited(
1208 " dropping dirty+flushing %s state for %p %lld\n",
1209 ceph_cap_string(ci->i_flushing_caps),
1210 inode, ceph_ino(inode));
1211 ci->i_flushing_caps = 0;
1212 list_del_init(&ci->i_flushing_item);
1213 mdsc->num_cap_flushing--;
1214 drop = true;
1215 }
1216 spin_unlock(&mdsc->cap_dirty_lock);
1217
1218 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1219 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
1220 ci->i_prealloc_cap_flush = NULL;
1221 }
1222 }
1223 spin_unlock(&ci->i_ceph_lock);
1224 while (!list_empty(&to_remove)) {
1225 struct ceph_cap_flush *cf;
1226 cf = list_first_entry(&to_remove,
1227 struct ceph_cap_flush, i_list);
1228 list_del(&cf->i_list);
1229 ceph_free_cap_flush(cf);
1230 }
1231
1232 wake_up_all(&ci->i_cap_wq);
1233 if (invalidate)
1234 ceph_queue_invalidate(inode);
1235 if (drop)
1236 iput(inode);
1237 return 0;
1238 }
1239
1240 /*
1241 * caller must hold session s_mutex
1242 */
1243 static void remove_session_caps(struct ceph_mds_session *session)
1244 {
1245 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1246 struct super_block *sb = fsc->sb;
1247 dout("remove_session_caps on %p\n", session);
1248 iterate_session_caps(session, remove_session_caps_cb, fsc);
1249
1250 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1251
1252 spin_lock(&session->s_cap_lock);
1253 if (session->s_nr_caps > 0) {
1254 struct inode *inode;
1255 struct ceph_cap *cap, *prev = NULL;
1256 struct ceph_vino vino;
1257 /*
1258 * iterate_session_caps() skips inodes that are being
1259 * deleted, we need to wait until deletions are complete.
1260 * __wait_on_freeing_inode() is designed for the job,
1261 * but it is not exported, so use lookup inode function
1262 * to access it.
1263 */
1264 while (!list_empty(&session->s_caps)) {
1265 cap = list_entry(session->s_caps.next,
1266 struct ceph_cap, session_caps);
1267 if (cap == prev)
1268 break;
1269 prev = cap;
1270 vino = cap->ci->i_vino;
1271 spin_unlock(&session->s_cap_lock);
1272
1273 inode = ceph_find_inode(sb, vino);
1274 iput(inode);
1275
1276 spin_lock(&session->s_cap_lock);
1277 }
1278 }
1279
1280 // drop cap expires and unlock s_cap_lock
1281 cleanup_cap_releases(session->s_mdsc, session);
1282
1283 BUG_ON(session->s_nr_caps > 0);
1284 BUG_ON(!list_empty(&session->s_cap_flushing));
1285 }
1286
1287 /*
1288 * wake up any threads waiting on this session's caps. if the cap is
1289 * old (didn't get renewed on the client reconnect), remove it now.
1290 *
1291 * caller must hold s_mutex.
1292 */
1293 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1294 void *arg)
1295 {
1296 struct ceph_inode_info *ci = ceph_inode(inode);
1297
1298 if (arg) {
1299 spin_lock(&ci->i_ceph_lock);
1300 ci->i_wanted_max_size = 0;
1301 ci->i_requested_max_size = 0;
1302 spin_unlock(&ci->i_ceph_lock);
1303 }
1304 wake_up_all(&ci->i_cap_wq);
1305 return 0;
1306 }
1307
1308 static void wake_up_session_caps(struct ceph_mds_session *session,
1309 int reconnect)
1310 {
1311 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1312 iterate_session_caps(session, wake_up_session_cb,
1313 (void *)(unsigned long)reconnect);
1314 }
1315
1316 /*
1317 * Send periodic message to MDS renewing all currently held caps. The
1318 * ack will reset the expiration for all caps from this session.
1319 *
1320 * caller holds s_mutex
1321 */
1322 static int send_renew_caps(struct ceph_mds_client *mdsc,
1323 struct ceph_mds_session *session)
1324 {
1325 struct ceph_msg *msg;
1326 int state;
1327
1328 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1329 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1330 pr_info("mds%d caps stale\n", session->s_mds);
1331 session->s_renew_requested = jiffies;
1332
1333 /* do not try to renew caps until a recovering mds has reconnected
1334 * with its clients. */
1335 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1336 if (state < CEPH_MDS_STATE_RECONNECT) {
1337 dout("send_renew_caps ignoring mds%d (%s)\n",
1338 session->s_mds, ceph_mds_state_name(state));
1339 return 0;
1340 }
1341
1342 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1343 ceph_mds_state_name(state));
1344 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1345 ++session->s_renew_seq);
1346 if (!msg)
1347 return -ENOMEM;
1348 ceph_con_send(&session->s_con, msg);
1349 return 0;
1350 }
1351
1352 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1353 struct ceph_mds_session *session, u64 seq)
1354 {
1355 struct ceph_msg *msg;
1356
1357 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1358 session->s_mds, ceph_session_state_name(session->s_state), seq);
1359 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1360 if (!msg)
1361 return -ENOMEM;
1362 ceph_con_send(&session->s_con, msg);
1363 return 0;
1364 }
1365
1366
1367 /*
1368 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1369 *
1370 * Called under session->s_mutex
1371 */
1372 static void renewed_caps(struct ceph_mds_client *mdsc,
1373 struct ceph_mds_session *session, int is_renew)
1374 {
1375 int was_stale;
1376 int wake = 0;
1377
1378 spin_lock(&session->s_cap_lock);
1379 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1380
1381 session->s_cap_ttl = session->s_renew_requested +
1382 mdsc->mdsmap->m_session_timeout*HZ;
1383
1384 if (was_stale) {
1385 if (time_before(jiffies, session->s_cap_ttl)) {
1386 pr_info("mds%d caps renewed\n", session->s_mds);
1387 wake = 1;
1388 } else {
1389 pr_info("mds%d caps still stale\n", session->s_mds);
1390 }
1391 }
1392 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1393 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1394 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1395 spin_unlock(&session->s_cap_lock);
1396
1397 if (wake)
1398 wake_up_session_caps(session, 0);
1399 }
1400
1401 /*
1402 * send a session close request
1403 */
1404 static int request_close_session(struct ceph_mds_client *mdsc,
1405 struct ceph_mds_session *session)
1406 {
1407 struct ceph_msg *msg;
1408
1409 dout("request_close_session mds%d state %s seq %lld\n",
1410 session->s_mds, ceph_session_state_name(session->s_state),
1411 session->s_seq);
1412 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1413 if (!msg)
1414 return -ENOMEM;
1415 ceph_con_send(&session->s_con, msg);
1416 return 1;
1417 }
1418
1419 /*
1420 * Called with s_mutex held.
1421 */
1422 static int __close_session(struct ceph_mds_client *mdsc,
1423 struct ceph_mds_session *session)
1424 {
1425 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1426 return 0;
1427 session->s_state = CEPH_MDS_SESSION_CLOSING;
1428 return request_close_session(mdsc, session);
1429 }
1430
1431 /*
1432 * Trim old(er) caps.
1433 *
1434 * Because we can't cache an inode without one or more caps, we do
1435 * this indirectly: if a cap is unused, we prune its aliases, at which
1436 * point the inode will hopefully get dropped to.
1437 *
1438 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1439 * memory pressure from the MDS, though, so it needn't be perfect.
1440 */
1441 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1442 {
1443 struct ceph_mds_session *session = arg;
1444 struct ceph_inode_info *ci = ceph_inode(inode);
1445 int used, wanted, oissued, mine;
1446
1447 if (session->s_trim_caps <= 0)
1448 return -1;
1449
1450 spin_lock(&ci->i_ceph_lock);
1451 mine = cap->issued | cap->implemented;
1452 used = __ceph_caps_used(ci);
1453 wanted = __ceph_caps_file_wanted(ci);
1454 oissued = __ceph_caps_issued_other(ci, cap);
1455
1456 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1457 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1458 ceph_cap_string(used), ceph_cap_string(wanted));
1459 if (cap == ci->i_auth_cap) {
1460 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1461 !list_empty(&ci->i_cap_snaps))
1462 goto out;
1463 if ((used | wanted) & CEPH_CAP_ANY_WR)
1464 goto out;
1465 }
1466 /* The inode has cached pages, but it's no longer used.
1467 * we can safely drop it */
1468 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1469 !(oissued & CEPH_CAP_FILE_CACHE)) {
1470 used = 0;
1471 oissued = 0;
1472 }
1473 if ((used | wanted) & ~oissued & mine)
1474 goto out; /* we need these caps */
1475
1476 session->s_trim_caps--;
1477 if (oissued) {
1478 /* we aren't the only cap.. just remove us */
1479 __ceph_remove_cap(cap, true);
1480 } else {
1481 /* try dropping referring dentries */
1482 spin_unlock(&ci->i_ceph_lock);
1483 d_prune_aliases(inode);
1484 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1485 inode, cap, atomic_read(&inode->i_count));
1486 return 0;
1487 }
1488
1489 out:
1490 spin_unlock(&ci->i_ceph_lock);
1491 return 0;
1492 }
1493
1494 /*
1495 * Trim session cap count down to some max number.
1496 */
1497 static int trim_caps(struct ceph_mds_client *mdsc,
1498 struct ceph_mds_session *session,
1499 int max_caps)
1500 {
1501 int trim_caps = session->s_nr_caps - max_caps;
1502
1503 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1504 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1505 if (trim_caps > 0) {
1506 session->s_trim_caps = trim_caps;
1507 iterate_session_caps(session, trim_caps_cb, session);
1508 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1509 session->s_mds, session->s_nr_caps, max_caps,
1510 trim_caps - session->s_trim_caps);
1511 session->s_trim_caps = 0;
1512 }
1513
1514 ceph_send_cap_releases(mdsc, session);
1515 return 0;
1516 }
1517
1518 static int check_caps_flush(struct ceph_mds_client *mdsc,
1519 u64 want_flush_tid)
1520 {
1521 int ret = 1;
1522
1523 spin_lock(&mdsc->cap_dirty_lock);
1524 if (!list_empty(&mdsc->cap_flush_list)) {
1525 struct ceph_cap_flush *cf =
1526 list_first_entry(&mdsc->cap_flush_list,
1527 struct ceph_cap_flush, g_list);
1528 if (cf->tid <= want_flush_tid) {
1529 dout("check_caps_flush still flushing tid "
1530 "%llu <= %llu\n", cf->tid, want_flush_tid);
1531 ret = 0;
1532 }
1533 }
1534 spin_unlock(&mdsc->cap_dirty_lock);
1535 return ret;
1536 }
1537
1538 /*
1539 * flush all dirty inode data to disk.
1540 *
1541 * returns true if we've flushed through want_flush_tid
1542 */
1543 static void wait_caps_flush(struct ceph_mds_client *mdsc,
1544 u64 want_flush_tid)
1545 {
1546 dout("check_caps_flush want %llu\n", want_flush_tid);
1547
1548 wait_event(mdsc->cap_flushing_wq,
1549 check_caps_flush(mdsc, want_flush_tid));
1550
1551 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
1552 }
1553
1554 /*
1555 * called under s_mutex
1556 */
1557 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1558 struct ceph_mds_session *session)
1559 {
1560 struct ceph_msg *msg = NULL;
1561 struct ceph_mds_cap_release *head;
1562 struct ceph_mds_cap_item *item;
1563 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
1564 struct ceph_cap *cap;
1565 LIST_HEAD(tmp_list);
1566 int num_cap_releases;
1567 __le32 barrier, *cap_barrier;
1568
1569 down_read(&osdc->lock);
1570 barrier = cpu_to_le32(osdc->epoch_barrier);
1571 up_read(&osdc->lock);
1572
1573 spin_lock(&session->s_cap_lock);
1574 again:
1575 list_splice_init(&session->s_cap_releases, &tmp_list);
1576 num_cap_releases = session->s_num_cap_releases;
1577 session->s_num_cap_releases = 0;
1578 spin_unlock(&session->s_cap_lock);
1579
1580 while (!list_empty(&tmp_list)) {
1581 if (!msg) {
1582 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1583 PAGE_SIZE, GFP_NOFS, false);
1584 if (!msg)
1585 goto out_err;
1586 head = msg->front.iov_base;
1587 head->num = cpu_to_le32(0);
1588 msg->front.iov_len = sizeof(*head);
1589
1590 msg->hdr.version = cpu_to_le16(2);
1591 msg->hdr.compat_version = cpu_to_le16(1);
1592 }
1593
1594 cap = list_first_entry(&tmp_list, struct ceph_cap,
1595 session_caps);
1596 list_del(&cap->session_caps);
1597 num_cap_releases--;
1598
1599 head = msg->front.iov_base;
1600 le32_add_cpu(&head->num, 1);
1601 item = msg->front.iov_base + msg->front.iov_len;
1602 item->ino = cpu_to_le64(cap->cap_ino);
1603 item->cap_id = cpu_to_le64(cap->cap_id);
1604 item->migrate_seq = cpu_to_le32(cap->mseq);
1605 item->seq = cpu_to_le32(cap->issue_seq);
1606 msg->front.iov_len += sizeof(*item);
1607
1608 ceph_put_cap(mdsc, cap);
1609
1610 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1611 // Append cap_barrier field
1612 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1613 *cap_barrier = barrier;
1614 msg->front.iov_len += sizeof(*cap_barrier);
1615
1616 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1617 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1618 ceph_con_send(&session->s_con, msg);
1619 msg = NULL;
1620 }
1621 }
1622
1623 BUG_ON(num_cap_releases != 0);
1624
1625 spin_lock(&session->s_cap_lock);
1626 if (!list_empty(&session->s_cap_releases))
1627 goto again;
1628 spin_unlock(&session->s_cap_lock);
1629
1630 if (msg) {
1631 // Append cap_barrier field
1632 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1633 *cap_barrier = barrier;
1634 msg->front.iov_len += sizeof(*cap_barrier);
1635
1636 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1637 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1638 ceph_con_send(&session->s_con, msg);
1639 }
1640 return;
1641 out_err:
1642 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1643 session->s_mds);
1644 spin_lock(&session->s_cap_lock);
1645 list_splice(&tmp_list, &session->s_cap_releases);
1646 session->s_num_cap_releases += num_cap_releases;
1647 spin_unlock(&session->s_cap_lock);
1648 }
1649
1650 /*
1651 * requests
1652 */
1653
1654 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1655 struct inode *dir)
1656 {
1657 struct ceph_inode_info *ci = ceph_inode(dir);
1658 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1659 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1660 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
1661 int order, num_entries;
1662
1663 spin_lock(&ci->i_ceph_lock);
1664 num_entries = ci->i_files + ci->i_subdirs;
1665 spin_unlock(&ci->i_ceph_lock);
1666 num_entries = max(num_entries, 1);
1667 num_entries = min(num_entries, opt->max_readdir);
1668
1669 order = get_order(size * num_entries);
1670 while (order >= 0) {
1671 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
1672 __GFP_NOWARN,
1673 order);
1674 if (rinfo->dir_entries)
1675 break;
1676 order--;
1677 }
1678 if (!rinfo->dir_entries)
1679 return -ENOMEM;
1680
1681 num_entries = (PAGE_SIZE << order) / size;
1682 num_entries = min(num_entries, opt->max_readdir);
1683
1684 rinfo->dir_buf_size = PAGE_SIZE << order;
1685 req->r_num_caps = num_entries + 1;
1686 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1687 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1688 return 0;
1689 }
1690
1691 /*
1692 * Create an mds request.
1693 */
1694 struct ceph_mds_request *
1695 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1696 {
1697 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1698
1699 if (!req)
1700 return ERR_PTR(-ENOMEM);
1701
1702 mutex_init(&req->r_fill_mutex);
1703 req->r_mdsc = mdsc;
1704 req->r_started = jiffies;
1705 req->r_resend_mds = -1;
1706 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1707 INIT_LIST_HEAD(&req->r_unsafe_target_item);
1708 req->r_fmode = -1;
1709 kref_init(&req->r_kref);
1710 RB_CLEAR_NODE(&req->r_node);
1711 INIT_LIST_HEAD(&req->r_wait);
1712 init_completion(&req->r_completion);
1713 init_completion(&req->r_safe_completion);
1714 INIT_LIST_HEAD(&req->r_unsafe_item);
1715
1716 req->r_stamp = timespec_trunc(current_kernel_time(), mdsc->fsc->sb->s_time_gran);
1717
1718 req->r_op = op;
1719 req->r_direct_mode = mode;
1720 return req;
1721 }
1722
1723 /*
1724 * return oldest (lowest) request, tid in request tree, 0 if none.
1725 *
1726 * called under mdsc->mutex.
1727 */
1728 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1729 {
1730 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1731 return NULL;
1732 return rb_entry(rb_first(&mdsc->request_tree),
1733 struct ceph_mds_request, r_node);
1734 }
1735
1736 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1737 {
1738 return mdsc->oldest_tid;
1739 }
1740
1741 /*
1742 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1743 * on build_path_from_dentry in fs/cifs/dir.c.
1744 *
1745 * If @stop_on_nosnap, generate path relative to the first non-snapped
1746 * inode.
1747 *
1748 * Encode hidden .snap dirs as a double /, i.e.
1749 * foo/.snap/bar -> foo//bar
1750 */
1751 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1752 int stop_on_nosnap)
1753 {
1754 struct dentry *temp;
1755 char *path;
1756 int len, pos;
1757 unsigned seq;
1758
1759 if (!dentry)
1760 return ERR_PTR(-EINVAL);
1761
1762 retry:
1763 len = 0;
1764 seq = read_seqbegin(&rename_lock);
1765 rcu_read_lock();
1766 for (temp = dentry; !IS_ROOT(temp);) {
1767 struct inode *inode = d_inode(temp);
1768 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1769 len++; /* slash only */
1770 else if (stop_on_nosnap && inode &&
1771 ceph_snap(inode) == CEPH_NOSNAP)
1772 break;
1773 else
1774 len += 1 + temp->d_name.len;
1775 temp = temp->d_parent;
1776 }
1777 rcu_read_unlock();
1778 if (len)
1779 len--; /* no leading '/' */
1780
1781 path = kmalloc(len+1, GFP_NOFS);
1782 if (!path)
1783 return ERR_PTR(-ENOMEM);
1784 pos = len;
1785 path[pos] = 0; /* trailing null */
1786 rcu_read_lock();
1787 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1788 struct inode *inode;
1789
1790 spin_lock(&temp->d_lock);
1791 inode = d_inode(temp);
1792 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1793 dout("build_path path+%d: %p SNAPDIR\n",
1794 pos, temp);
1795 } else if (stop_on_nosnap && inode &&
1796 ceph_snap(inode) == CEPH_NOSNAP) {
1797 spin_unlock(&temp->d_lock);
1798 break;
1799 } else {
1800 pos -= temp->d_name.len;
1801 if (pos < 0) {
1802 spin_unlock(&temp->d_lock);
1803 break;
1804 }
1805 strncpy(path + pos, temp->d_name.name,
1806 temp->d_name.len);
1807 }
1808 spin_unlock(&temp->d_lock);
1809 if (pos)
1810 path[--pos] = '/';
1811 temp = temp->d_parent;
1812 }
1813 rcu_read_unlock();
1814 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1815 pr_err("build_path did not end path lookup where "
1816 "expected, namelen is %d, pos is %d\n", len, pos);
1817 /* presumably this is only possible if racing with a
1818 rename of one of the parent directories (we can not
1819 lock the dentries above us to prevent this, but
1820 retrying should be harmless) */
1821 kfree(path);
1822 goto retry;
1823 }
1824
1825 *base = ceph_ino(d_inode(temp));
1826 *plen = len;
1827 dout("build_path on %p %d built %llx '%.*s'\n",
1828 dentry, d_count(dentry), *base, len, path);
1829 return path;
1830 }
1831
1832 static int build_dentry_path(struct dentry *dentry, struct inode *dir,
1833 const char **ppath, int *ppathlen, u64 *pino,
1834 int *pfreepath)
1835 {
1836 char *path;
1837
1838 rcu_read_lock();
1839 if (!dir)
1840 dir = d_inode_rcu(dentry->d_parent);
1841 if (dir && ceph_snap(dir) == CEPH_NOSNAP) {
1842 *pino = ceph_ino(dir);
1843 rcu_read_unlock();
1844 *ppath = dentry->d_name.name;
1845 *ppathlen = dentry->d_name.len;
1846 return 0;
1847 }
1848 rcu_read_unlock();
1849 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1850 if (IS_ERR(path))
1851 return PTR_ERR(path);
1852 *ppath = path;
1853 *pfreepath = 1;
1854 return 0;
1855 }
1856
1857 static int build_inode_path(struct inode *inode,
1858 const char **ppath, int *ppathlen, u64 *pino,
1859 int *pfreepath)
1860 {
1861 struct dentry *dentry;
1862 char *path;
1863
1864 if (ceph_snap(inode) == CEPH_NOSNAP) {
1865 *pino = ceph_ino(inode);
1866 *ppathlen = 0;
1867 return 0;
1868 }
1869 dentry = d_find_alias(inode);
1870 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1871 dput(dentry);
1872 if (IS_ERR(path))
1873 return PTR_ERR(path);
1874 *ppath = path;
1875 *pfreepath = 1;
1876 return 0;
1877 }
1878
1879 /*
1880 * request arguments may be specified via an inode *, a dentry *, or
1881 * an explicit ino+path.
1882 */
1883 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1884 struct inode *rdiri, const char *rpath,
1885 u64 rino, const char **ppath, int *pathlen,
1886 u64 *ino, int *freepath)
1887 {
1888 int r = 0;
1889
1890 if (rinode) {
1891 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1892 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1893 ceph_snap(rinode));
1894 } else if (rdentry) {
1895 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
1896 freepath);
1897 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1898 *ppath);
1899 } else if (rpath || rino) {
1900 *ino = rino;
1901 *ppath = rpath;
1902 *pathlen = rpath ? strlen(rpath) : 0;
1903 dout(" path %.*s\n", *pathlen, rpath);
1904 }
1905
1906 return r;
1907 }
1908
1909 /*
1910 * called under mdsc->mutex
1911 */
1912 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1913 struct ceph_mds_request *req,
1914 int mds, bool drop_cap_releases)
1915 {
1916 struct ceph_msg *msg;
1917 struct ceph_mds_request_head *head;
1918 const char *path1 = NULL;
1919 const char *path2 = NULL;
1920 u64 ino1 = 0, ino2 = 0;
1921 int pathlen1 = 0, pathlen2 = 0;
1922 int freepath1 = 0, freepath2 = 0;
1923 int len;
1924 u16 releases;
1925 void *p, *end;
1926 int ret;
1927
1928 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1929 req->r_parent, req->r_path1, req->r_ino1.ino,
1930 &path1, &pathlen1, &ino1, &freepath1);
1931 if (ret < 0) {
1932 msg = ERR_PTR(ret);
1933 goto out;
1934 }
1935
1936 ret = set_request_path_attr(NULL, req->r_old_dentry,
1937 req->r_old_dentry_dir,
1938 req->r_path2, req->r_ino2.ino,
1939 &path2, &pathlen2, &ino2, &freepath2);
1940 if (ret < 0) {
1941 msg = ERR_PTR(ret);
1942 goto out_free1;
1943 }
1944
1945 len = sizeof(*head) +
1946 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
1947 sizeof(struct ceph_timespec);
1948
1949 /* calculate (max) length for cap releases */
1950 len += sizeof(struct ceph_mds_request_release) *
1951 (!!req->r_inode_drop + !!req->r_dentry_drop +
1952 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1953 if (req->r_dentry_drop)
1954 len += req->r_dentry->d_name.len;
1955 if (req->r_old_dentry_drop)
1956 len += req->r_old_dentry->d_name.len;
1957
1958 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1959 if (!msg) {
1960 msg = ERR_PTR(-ENOMEM);
1961 goto out_free2;
1962 }
1963
1964 msg->hdr.version = cpu_to_le16(2);
1965 msg->hdr.tid = cpu_to_le64(req->r_tid);
1966
1967 head = msg->front.iov_base;
1968 p = msg->front.iov_base + sizeof(*head);
1969 end = msg->front.iov_base + msg->front.iov_len;
1970
1971 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1972 head->op = cpu_to_le32(req->r_op);
1973 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1974 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
1975 head->args = req->r_args;
1976
1977 ceph_encode_filepath(&p, end, ino1, path1);
1978 ceph_encode_filepath(&p, end, ino2, path2);
1979
1980 /* make note of release offset, in case we need to replay */
1981 req->r_request_release_offset = p - msg->front.iov_base;
1982
1983 /* cap releases */
1984 releases = 0;
1985 if (req->r_inode_drop)
1986 releases += ceph_encode_inode_release(&p,
1987 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
1988 mds, req->r_inode_drop, req->r_inode_unless, 0);
1989 if (req->r_dentry_drop)
1990 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1991 req->r_parent, mds, req->r_dentry_drop,
1992 req->r_dentry_unless);
1993 if (req->r_old_dentry_drop)
1994 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1995 req->r_old_dentry_dir, mds,
1996 req->r_old_dentry_drop,
1997 req->r_old_dentry_unless);
1998 if (req->r_old_inode_drop)
1999 releases += ceph_encode_inode_release(&p,
2000 d_inode(req->r_old_dentry),
2001 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
2002
2003 if (drop_cap_releases) {
2004 releases = 0;
2005 p = msg->front.iov_base + req->r_request_release_offset;
2006 }
2007
2008 head->num_releases = cpu_to_le16(releases);
2009
2010 /* time stamp */
2011 {
2012 struct ceph_timespec ts;
2013 ceph_encode_timespec(&ts, &req->r_stamp);
2014 ceph_encode_copy(&p, &ts, sizeof(ts));
2015 }
2016
2017 BUG_ON(p > end);
2018 msg->front.iov_len = p - msg->front.iov_base;
2019 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2020
2021 if (req->r_pagelist) {
2022 struct ceph_pagelist *pagelist = req->r_pagelist;
2023 refcount_inc(&pagelist->refcnt);
2024 ceph_msg_data_add_pagelist(msg, pagelist);
2025 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2026 } else {
2027 msg->hdr.data_len = 0;
2028 }
2029
2030 msg->hdr.data_off = cpu_to_le16(0);
2031
2032 out_free2:
2033 if (freepath2)
2034 kfree((char *)path2);
2035 out_free1:
2036 if (freepath1)
2037 kfree((char *)path1);
2038 out:
2039 return msg;
2040 }
2041
2042 /*
2043 * called under mdsc->mutex if error, under no mutex if
2044 * success.
2045 */
2046 static void complete_request(struct ceph_mds_client *mdsc,
2047 struct ceph_mds_request *req)
2048 {
2049 if (req->r_callback)
2050 req->r_callback(mdsc, req);
2051 else
2052 complete_all(&req->r_completion);
2053 }
2054
2055 /*
2056 * called under mdsc->mutex
2057 */
2058 static int __prepare_send_request(struct ceph_mds_client *mdsc,
2059 struct ceph_mds_request *req,
2060 int mds, bool drop_cap_releases)
2061 {
2062 struct ceph_mds_request_head *rhead;
2063 struct ceph_msg *msg;
2064 int flags = 0;
2065
2066 req->r_attempts++;
2067 if (req->r_inode) {
2068 struct ceph_cap *cap =
2069 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2070
2071 if (cap)
2072 req->r_sent_on_mseq = cap->mseq;
2073 else
2074 req->r_sent_on_mseq = -1;
2075 }
2076 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2077 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2078
2079 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2080 void *p;
2081 /*
2082 * Replay. Do not regenerate message (and rebuild
2083 * paths, etc.); just use the original message.
2084 * Rebuilding paths will break for renames because
2085 * d_move mangles the src name.
2086 */
2087 msg = req->r_request;
2088 rhead = msg->front.iov_base;
2089
2090 flags = le32_to_cpu(rhead->flags);
2091 flags |= CEPH_MDS_FLAG_REPLAY;
2092 rhead->flags = cpu_to_le32(flags);
2093
2094 if (req->r_target_inode)
2095 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2096
2097 rhead->num_retry = req->r_attempts - 1;
2098
2099 /* remove cap/dentry releases from message */
2100 rhead->num_releases = 0;
2101
2102 /* time stamp */
2103 p = msg->front.iov_base + req->r_request_release_offset;
2104 {
2105 struct ceph_timespec ts;
2106 ceph_encode_timespec(&ts, &req->r_stamp);
2107 ceph_encode_copy(&p, &ts, sizeof(ts));
2108 }
2109
2110 msg->front.iov_len = p - msg->front.iov_base;
2111 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2112 return 0;
2113 }
2114
2115 if (req->r_request) {
2116 ceph_msg_put(req->r_request);
2117 req->r_request = NULL;
2118 }
2119 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2120 if (IS_ERR(msg)) {
2121 req->r_err = PTR_ERR(msg);
2122 return PTR_ERR(msg);
2123 }
2124 req->r_request = msg;
2125
2126 rhead = msg->front.iov_base;
2127 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2128 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2129 flags |= CEPH_MDS_FLAG_REPLAY;
2130 if (req->r_parent)
2131 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2132 rhead->flags = cpu_to_le32(flags);
2133 rhead->num_fwd = req->r_num_fwd;
2134 rhead->num_retry = req->r_attempts - 1;
2135 rhead->ino = 0;
2136
2137 dout(" r_parent = %p\n", req->r_parent);
2138 return 0;
2139 }
2140
2141 /*
2142 * send request, or put it on the appropriate wait list.
2143 */
2144 static int __do_request(struct ceph_mds_client *mdsc,
2145 struct ceph_mds_request *req)
2146 {
2147 struct ceph_mds_session *session = NULL;
2148 int mds = -1;
2149 int err = 0;
2150
2151 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2152 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
2153 __unregister_request(mdsc, req);
2154 goto out;
2155 }
2156
2157 if (req->r_timeout &&
2158 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2159 dout("do_request timed out\n");
2160 err = -EIO;
2161 goto finish;
2162 }
2163 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2164 dout("do_request forced umount\n");
2165 err = -EIO;
2166 goto finish;
2167 }
2168 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2169 if (mdsc->mdsmap_err) {
2170 err = mdsc->mdsmap_err;
2171 dout("do_request mdsmap err %d\n", err);
2172 goto finish;
2173 }
2174 if (mdsc->mdsmap->m_epoch == 0) {
2175 dout("do_request no mdsmap, waiting for map\n");
2176 list_add(&req->r_wait, &mdsc->waiting_for_map);
2177 goto finish;
2178 }
2179 if (!(mdsc->fsc->mount_options->flags &
2180 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2181 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2182 err = -ENOENT;
2183 pr_info("probably no mds server is up\n");
2184 goto finish;
2185 }
2186 }
2187
2188 put_request_session(req);
2189
2190 mds = __choose_mds(mdsc, req);
2191 if (mds < 0 ||
2192 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2193 dout("do_request no mds or not active, waiting for map\n");
2194 list_add(&req->r_wait, &mdsc->waiting_for_map);
2195 goto out;
2196 }
2197
2198 /* get, open session */
2199 session = __ceph_lookup_mds_session(mdsc, mds);
2200 if (!session) {
2201 session = register_session(mdsc, mds);
2202 if (IS_ERR(session)) {
2203 err = PTR_ERR(session);
2204 goto finish;
2205 }
2206 }
2207 req->r_session = get_session(session);
2208
2209 dout("do_request mds%d session %p state %s\n", mds, session,
2210 ceph_session_state_name(session->s_state));
2211 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2212 session->s_state != CEPH_MDS_SESSION_HUNG) {
2213 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2214 err = -EACCES;
2215 goto out_session;
2216 }
2217 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2218 session->s_state == CEPH_MDS_SESSION_CLOSING)
2219 __open_session(mdsc, session);
2220 list_add(&req->r_wait, &session->s_waiting);
2221 goto out_session;
2222 }
2223
2224 /* send request */
2225 req->r_resend_mds = -1; /* forget any previous mds hint */
2226
2227 if (req->r_request_started == 0) /* note request start time */
2228 req->r_request_started = jiffies;
2229
2230 err = __prepare_send_request(mdsc, req, mds, false);
2231 if (!err) {
2232 ceph_msg_get(req->r_request);
2233 ceph_con_send(&session->s_con, req->r_request);
2234 }
2235
2236 out_session:
2237 ceph_put_mds_session(session);
2238 finish:
2239 if (err) {
2240 dout("__do_request early error %d\n", err);
2241 req->r_err = err;
2242 complete_request(mdsc, req);
2243 __unregister_request(mdsc, req);
2244 }
2245 out:
2246 return err;
2247 }
2248
2249 /*
2250 * called under mdsc->mutex
2251 */
2252 static void __wake_requests(struct ceph_mds_client *mdsc,
2253 struct list_head *head)
2254 {
2255 struct ceph_mds_request *req;
2256 LIST_HEAD(tmp_list);
2257
2258 list_splice_init(head, &tmp_list);
2259
2260 while (!list_empty(&tmp_list)) {
2261 req = list_entry(tmp_list.next,
2262 struct ceph_mds_request, r_wait);
2263 list_del_init(&req->r_wait);
2264 dout(" wake request %p tid %llu\n", req, req->r_tid);
2265 __do_request(mdsc, req);
2266 }
2267 }
2268
2269 /*
2270 * Wake up threads with requests pending for @mds, so that they can
2271 * resubmit their requests to a possibly different mds.
2272 */
2273 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2274 {
2275 struct ceph_mds_request *req;
2276 struct rb_node *p = rb_first(&mdsc->request_tree);
2277
2278 dout("kick_requests mds%d\n", mds);
2279 while (p) {
2280 req = rb_entry(p, struct ceph_mds_request, r_node);
2281 p = rb_next(p);
2282 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2283 continue;
2284 if (req->r_attempts > 0)
2285 continue; /* only new requests */
2286 if (req->r_session &&
2287 req->r_session->s_mds == mds) {
2288 dout(" kicking tid %llu\n", req->r_tid);
2289 list_del_init(&req->r_wait);
2290 __do_request(mdsc, req);
2291 }
2292 }
2293 }
2294
2295 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2296 struct ceph_mds_request *req)
2297 {
2298 dout("submit_request on %p\n", req);
2299 mutex_lock(&mdsc->mutex);
2300 __register_request(mdsc, req, NULL);
2301 __do_request(mdsc, req);
2302 mutex_unlock(&mdsc->mutex);
2303 }
2304
2305 /*
2306 * Synchrously perform an mds request. Take care of all of the
2307 * session setup, forwarding, retry details.
2308 */
2309 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2310 struct inode *dir,
2311 struct ceph_mds_request *req)
2312 {
2313 int err;
2314
2315 dout("do_request on %p\n", req);
2316
2317 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
2318 if (req->r_inode)
2319 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2320 if (req->r_parent)
2321 ceph_get_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
2322 if (req->r_old_dentry_dir)
2323 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2324 CEPH_CAP_PIN);
2325
2326 /* issue */
2327 mutex_lock(&mdsc->mutex);
2328 __register_request(mdsc, req, dir);
2329 __do_request(mdsc, req);
2330
2331 if (req->r_err) {
2332 err = req->r_err;
2333 goto out;
2334 }
2335
2336 /* wait */
2337 mutex_unlock(&mdsc->mutex);
2338 dout("do_request waiting\n");
2339 if (!req->r_timeout && req->r_wait_for_completion) {
2340 err = req->r_wait_for_completion(mdsc, req);
2341 } else {
2342 long timeleft = wait_for_completion_killable_timeout(
2343 &req->r_completion,
2344 ceph_timeout_jiffies(req->r_timeout));
2345 if (timeleft > 0)
2346 err = 0;
2347 else if (!timeleft)
2348 err = -EIO; /* timed out */
2349 else
2350 err = timeleft; /* killed */
2351 }
2352 dout("do_request waited, got %d\n", err);
2353 mutex_lock(&mdsc->mutex);
2354
2355 /* only abort if we didn't race with a real reply */
2356 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2357 err = le32_to_cpu(req->r_reply_info.head->result);
2358 } else if (err < 0) {
2359 dout("aborted request %lld with %d\n", req->r_tid, err);
2360
2361 /*
2362 * ensure we aren't running concurrently with
2363 * ceph_fill_trace or ceph_readdir_prepopulate, which
2364 * rely on locks (dir mutex) held by our caller.
2365 */
2366 mutex_lock(&req->r_fill_mutex);
2367 req->r_err = err;
2368 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
2369 mutex_unlock(&req->r_fill_mutex);
2370
2371 if (req->r_parent &&
2372 (req->r_op & CEPH_MDS_OP_WRITE))
2373 ceph_invalidate_dir_request(req);
2374 } else {
2375 err = req->r_err;
2376 }
2377
2378 out:
2379 mutex_unlock(&mdsc->mutex);
2380 dout("do_request %p done, result %d\n", req, err);
2381 return err;
2382 }
2383
2384 /*
2385 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2386 * namespace request.
2387 */
2388 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2389 {
2390 struct inode *inode = req->r_parent;
2391
2392 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
2393
2394 ceph_dir_clear_complete(inode);
2395 if (req->r_dentry)
2396 ceph_invalidate_dentry_lease(req->r_dentry);
2397 if (req->r_old_dentry)
2398 ceph_invalidate_dentry_lease(req->r_old_dentry);
2399 }
2400
2401 /*
2402 * Handle mds reply.
2403 *
2404 * We take the session mutex and parse and process the reply immediately.
2405 * This preserves the logical ordering of replies, capabilities, etc., sent
2406 * by the MDS as they are applied to our local cache.
2407 */
2408 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2409 {
2410 struct ceph_mds_client *mdsc = session->s_mdsc;
2411 struct ceph_mds_request *req;
2412 struct ceph_mds_reply_head *head = msg->front.iov_base;
2413 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2414 struct ceph_snap_realm *realm;
2415 u64 tid;
2416 int err, result;
2417 int mds = session->s_mds;
2418
2419 if (msg->front.iov_len < sizeof(*head)) {
2420 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2421 ceph_msg_dump(msg);
2422 return;
2423 }
2424
2425 /* get request, session */
2426 tid = le64_to_cpu(msg->hdr.tid);
2427 mutex_lock(&mdsc->mutex);
2428 req = lookup_get_request(mdsc, tid);
2429 if (!req) {
2430 dout("handle_reply on unknown tid %llu\n", tid);
2431 mutex_unlock(&mdsc->mutex);
2432 return;
2433 }
2434 dout("handle_reply %p\n", req);
2435
2436 /* correct session? */
2437 if (req->r_session != session) {
2438 pr_err("mdsc_handle_reply got %llu on session mds%d"
2439 " not mds%d\n", tid, session->s_mds,
2440 req->r_session ? req->r_session->s_mds : -1);
2441 mutex_unlock(&mdsc->mutex);
2442 goto out;
2443 }
2444
2445 /* dup? */
2446 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
2447 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
2448 pr_warn("got a dup %s reply on %llu from mds%d\n",
2449 head->safe ? "safe" : "unsafe", tid, mds);
2450 mutex_unlock(&mdsc->mutex);
2451 goto out;
2452 }
2453 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
2454 pr_warn("got unsafe after safe on %llu from mds%d\n",
2455 tid, mds);
2456 mutex_unlock(&mdsc->mutex);
2457 goto out;
2458 }
2459
2460 result = le32_to_cpu(head->result);
2461
2462 /*
2463 * Handle an ESTALE
2464 * if we're not talking to the authority, send to them
2465 * if the authority has changed while we weren't looking,
2466 * send to new authority
2467 * Otherwise we just have to return an ESTALE
2468 */
2469 if (result == -ESTALE) {
2470 dout("got ESTALE on request %llu", req->r_tid);
2471 req->r_resend_mds = -1;
2472 if (req->r_direct_mode != USE_AUTH_MDS) {
2473 dout("not using auth, setting for that now");
2474 req->r_direct_mode = USE_AUTH_MDS;
2475 __do_request(mdsc, req);
2476 mutex_unlock(&mdsc->mutex);
2477 goto out;
2478 } else {
2479 int mds = __choose_mds(mdsc, req);
2480 if (mds >= 0 && mds != req->r_session->s_mds) {
2481 dout("but auth changed, so resending");
2482 __do_request(mdsc, req);
2483 mutex_unlock(&mdsc->mutex);
2484 goto out;
2485 }
2486 }
2487 dout("have to return ESTALE on request %llu", req->r_tid);
2488 }
2489
2490
2491 if (head->safe) {
2492 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2493 __unregister_request(mdsc, req);
2494
2495 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2496 /*
2497 * We already handled the unsafe response, now do the
2498 * cleanup. No need to examine the response; the MDS
2499 * doesn't include any result info in the safe
2500 * response. And even if it did, there is nothing
2501 * useful we could do with a revised return value.
2502 */
2503 dout("got safe reply %llu, mds%d\n", tid, mds);
2504
2505 /* last unsafe request during umount? */
2506 if (mdsc->stopping && !__get_oldest_req(mdsc))
2507 complete_all(&mdsc->safe_umount_waiters);
2508 mutex_unlock(&mdsc->mutex);
2509 goto out;
2510 }
2511 } else {
2512 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2513 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2514 if (req->r_unsafe_dir) {
2515 struct ceph_inode_info *ci =
2516 ceph_inode(req->r_unsafe_dir);
2517 spin_lock(&ci->i_unsafe_lock);
2518 list_add_tail(&req->r_unsafe_dir_item,
2519 &ci->i_unsafe_dirops);
2520 spin_unlock(&ci->i_unsafe_lock);
2521 }
2522 }
2523
2524 dout("handle_reply tid %lld result %d\n", tid, result);
2525 rinfo = &req->r_reply_info;
2526 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2527 mutex_unlock(&mdsc->mutex);
2528
2529 mutex_lock(&session->s_mutex);
2530 if (err < 0) {
2531 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2532 ceph_msg_dump(msg);
2533 goto out_err;
2534 }
2535
2536 /* snap trace */
2537 realm = NULL;
2538 if (rinfo->snapblob_len) {
2539 down_write(&mdsc->snap_rwsem);
2540 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2541 rinfo->snapblob + rinfo->snapblob_len,
2542 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2543 &realm);
2544 downgrade_write(&mdsc->snap_rwsem);
2545 } else {
2546 down_read(&mdsc->snap_rwsem);
2547 }
2548
2549 /* insert trace into our cache */
2550 mutex_lock(&req->r_fill_mutex);
2551 current->journal_info = req;
2552 err = ceph_fill_trace(mdsc->fsc->sb, req);
2553 if (err == 0) {
2554 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2555 req->r_op == CEPH_MDS_OP_LSSNAP))
2556 ceph_readdir_prepopulate(req, req->r_session);
2557 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2558 }
2559 current->journal_info = NULL;
2560 mutex_unlock(&req->r_fill_mutex);
2561
2562 up_read(&mdsc->snap_rwsem);
2563 if (realm)
2564 ceph_put_snap_realm(mdsc, realm);
2565
2566 if (err == 0 && req->r_target_inode &&
2567 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2568 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2569 spin_lock(&ci->i_unsafe_lock);
2570 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2571 spin_unlock(&ci->i_unsafe_lock);
2572 }
2573 out_err:
2574 mutex_lock(&mdsc->mutex);
2575 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2576 if (err) {
2577 req->r_err = err;
2578 } else {
2579 req->r_reply = ceph_msg_get(msg);
2580 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
2581 }
2582 } else {
2583 dout("reply arrived after request %lld was aborted\n", tid);
2584 }
2585 mutex_unlock(&mdsc->mutex);
2586
2587 mutex_unlock(&session->s_mutex);
2588
2589 /* kick calling process */
2590 complete_request(mdsc, req);
2591 out:
2592 ceph_mdsc_put_request(req);
2593 return;
2594 }
2595
2596
2597
2598 /*
2599 * handle mds notification that our request has been forwarded.
2600 */
2601 static void handle_forward(struct ceph_mds_client *mdsc,
2602 struct ceph_mds_session *session,
2603 struct ceph_msg *msg)
2604 {
2605 struct ceph_mds_request *req;
2606 u64 tid = le64_to_cpu(msg->hdr.tid);
2607 u32 next_mds;
2608 u32 fwd_seq;
2609 int err = -EINVAL;
2610 void *p = msg->front.iov_base;
2611 void *end = p + msg->front.iov_len;
2612
2613 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2614 next_mds = ceph_decode_32(&p);
2615 fwd_seq = ceph_decode_32(&p);
2616
2617 mutex_lock(&mdsc->mutex);
2618 req = lookup_get_request(mdsc, tid);
2619 if (!req) {
2620 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2621 goto out; /* dup reply? */
2622 }
2623
2624 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2625 dout("forward tid %llu aborted, unregistering\n", tid);
2626 __unregister_request(mdsc, req);
2627 } else if (fwd_seq <= req->r_num_fwd) {
2628 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2629 tid, next_mds, req->r_num_fwd, fwd_seq);
2630 } else {
2631 /* resend. forward race not possible; mds would drop */
2632 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2633 BUG_ON(req->r_err);
2634 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
2635 req->r_attempts = 0;
2636 req->r_num_fwd = fwd_seq;
2637 req->r_resend_mds = next_mds;
2638 put_request_session(req);
2639 __do_request(mdsc, req);
2640 }
2641 ceph_mdsc_put_request(req);
2642 out:
2643 mutex_unlock(&mdsc->mutex);
2644 return;
2645
2646 bad:
2647 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2648 }
2649
2650 /*
2651 * handle a mds session control message
2652 */
2653 static void handle_session(struct ceph_mds_session *session,
2654 struct ceph_msg *msg)
2655 {
2656 struct ceph_mds_client *mdsc = session->s_mdsc;
2657 u32 op;
2658 u64 seq;
2659 int mds = session->s_mds;
2660 struct ceph_mds_session_head *h = msg->front.iov_base;
2661 int wake = 0;
2662
2663 /* decode */
2664 if (msg->front.iov_len != sizeof(*h))
2665 goto bad;
2666 op = le32_to_cpu(h->op);
2667 seq = le64_to_cpu(h->seq);
2668
2669 mutex_lock(&mdsc->mutex);
2670 if (op == CEPH_SESSION_CLOSE) {
2671 get_session(session);
2672 __unregister_session(mdsc, session);
2673 }
2674 /* FIXME: this ttl calculation is generous */
2675 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2676 mutex_unlock(&mdsc->mutex);
2677
2678 mutex_lock(&session->s_mutex);
2679
2680 dout("handle_session mds%d %s %p state %s seq %llu\n",
2681 mds, ceph_session_op_name(op), session,
2682 ceph_session_state_name(session->s_state), seq);
2683
2684 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2685 session->s_state = CEPH_MDS_SESSION_OPEN;
2686 pr_info("mds%d came back\n", session->s_mds);
2687 }
2688
2689 switch (op) {
2690 case CEPH_SESSION_OPEN:
2691 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2692 pr_info("mds%d reconnect success\n", session->s_mds);
2693 session->s_state = CEPH_MDS_SESSION_OPEN;
2694 renewed_caps(mdsc, session, 0);
2695 wake = 1;
2696 if (mdsc->stopping)
2697 __close_session(mdsc, session);
2698 break;
2699
2700 case CEPH_SESSION_RENEWCAPS:
2701 if (session->s_renew_seq == seq)
2702 renewed_caps(mdsc, session, 1);
2703 break;
2704
2705 case CEPH_SESSION_CLOSE:
2706 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2707 pr_info("mds%d reconnect denied\n", session->s_mds);
2708 cleanup_session_requests(mdsc, session);
2709 remove_session_caps(session);
2710 wake = 2; /* for good measure */
2711 wake_up_all(&mdsc->session_close_wq);
2712 break;
2713
2714 case CEPH_SESSION_STALE:
2715 pr_info("mds%d caps went stale, renewing\n",
2716 session->s_mds);
2717 spin_lock(&session->s_gen_ttl_lock);
2718 session->s_cap_gen++;
2719 session->s_cap_ttl = jiffies - 1;
2720 spin_unlock(&session->s_gen_ttl_lock);
2721 send_renew_caps(mdsc, session);
2722 break;
2723
2724 case CEPH_SESSION_RECALL_STATE:
2725 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2726 break;
2727
2728 case CEPH_SESSION_FLUSHMSG:
2729 send_flushmsg_ack(mdsc, session, seq);
2730 break;
2731
2732 case CEPH_SESSION_FORCE_RO:
2733 dout("force_session_readonly %p\n", session);
2734 spin_lock(&session->s_cap_lock);
2735 session->s_readonly = true;
2736 spin_unlock(&session->s_cap_lock);
2737 wake_up_session_caps(session, 0);
2738 break;
2739
2740 case CEPH_SESSION_REJECT:
2741 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
2742 pr_info("mds%d rejected session\n", session->s_mds);
2743 session->s_state = CEPH_MDS_SESSION_REJECTED;
2744 cleanup_session_requests(mdsc, session);
2745 remove_session_caps(session);
2746 wake = 2; /* for good measure */
2747 break;
2748
2749 default:
2750 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2751 WARN_ON(1);
2752 }
2753
2754 mutex_unlock(&session->s_mutex);
2755 if (wake) {
2756 mutex_lock(&mdsc->mutex);
2757 __wake_requests(mdsc, &session->s_waiting);
2758 if (wake == 2)
2759 kick_requests(mdsc, mds);
2760 mutex_unlock(&mdsc->mutex);
2761 }
2762 if (op == CEPH_SESSION_CLOSE)
2763 ceph_put_mds_session(session);
2764 return;
2765
2766 bad:
2767 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2768 (int)msg->front.iov_len);
2769 ceph_msg_dump(msg);
2770 return;
2771 }
2772
2773
2774 /*
2775 * called under session->mutex.
2776 */
2777 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2778 struct ceph_mds_session *session)
2779 {
2780 struct ceph_mds_request *req, *nreq;
2781 struct rb_node *p;
2782 int err;
2783
2784 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2785
2786 mutex_lock(&mdsc->mutex);
2787 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2788 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2789 if (!err) {
2790 ceph_msg_get(req->r_request);
2791 ceph_con_send(&session->s_con, req->r_request);
2792 }
2793 }
2794
2795 /*
2796 * also re-send old requests when MDS enters reconnect stage. So that MDS
2797 * can process completed request in clientreplay stage.
2798 */
2799 p = rb_first(&mdsc->request_tree);
2800 while (p) {
2801 req = rb_entry(p, struct ceph_mds_request, r_node);
2802 p = rb_next(p);
2803 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2804 continue;
2805 if (req->r_attempts == 0)
2806 continue; /* only old requests */
2807 if (req->r_session &&
2808 req->r_session->s_mds == session->s_mds) {
2809 err = __prepare_send_request(mdsc, req,
2810 session->s_mds, true);
2811 if (!err) {
2812 ceph_msg_get(req->r_request);
2813 ceph_con_send(&session->s_con, req->r_request);
2814 }
2815 }
2816 }
2817 mutex_unlock(&mdsc->mutex);
2818 }
2819
2820 /*
2821 * Encode information about a cap for a reconnect with the MDS.
2822 */
2823 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2824 void *arg)
2825 {
2826 union {
2827 struct ceph_mds_cap_reconnect v2;
2828 struct ceph_mds_cap_reconnect_v1 v1;
2829 } rec;
2830 struct ceph_inode_info *ci;
2831 struct ceph_reconnect_state *recon_state = arg;
2832 struct ceph_pagelist *pagelist = recon_state->pagelist;
2833 char *path;
2834 int pathlen, err;
2835 u64 pathbase;
2836 u64 snap_follows;
2837 struct dentry *dentry;
2838
2839 ci = cap->ci;
2840
2841 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2842 inode, ceph_vinop(inode), cap, cap->cap_id,
2843 ceph_cap_string(cap->issued));
2844 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2845 if (err)
2846 return err;
2847
2848 dentry = d_find_alias(inode);
2849 if (dentry) {
2850 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2851 if (IS_ERR(path)) {
2852 err = PTR_ERR(path);
2853 goto out_dput;
2854 }
2855 } else {
2856 path = NULL;
2857 pathlen = 0;
2858 pathbase = 0;
2859 }
2860
2861 spin_lock(&ci->i_ceph_lock);
2862 cap->seq = 0; /* reset cap seq */
2863 cap->issue_seq = 0; /* and issue_seq */
2864 cap->mseq = 0; /* and migrate_seq */
2865 cap->cap_gen = cap->session->s_cap_gen;
2866
2867 if (recon_state->msg_version >= 2) {
2868 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2869 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2870 rec.v2.issued = cpu_to_le32(cap->issued);
2871 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2872 rec.v2.pathbase = cpu_to_le64(pathbase);
2873 rec.v2.flock_len = 0;
2874 } else {
2875 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2876 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2877 rec.v1.issued = cpu_to_le32(cap->issued);
2878 rec.v1.size = cpu_to_le64(inode->i_size);
2879 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2880 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2881 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2882 rec.v1.pathbase = cpu_to_le64(pathbase);
2883 }
2884
2885 if (list_empty(&ci->i_cap_snaps)) {
2886 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
2887 } else {
2888 struct ceph_cap_snap *capsnap =
2889 list_first_entry(&ci->i_cap_snaps,
2890 struct ceph_cap_snap, ci_item);
2891 snap_follows = capsnap->follows;
2892 }
2893 spin_unlock(&ci->i_ceph_lock);
2894
2895 if (recon_state->msg_version >= 2) {
2896 int num_fcntl_locks, num_flock_locks;
2897 struct ceph_filelock *flocks;
2898 size_t struct_len, total_len = 0;
2899 u8 struct_v = 0;
2900
2901 encode_again:
2902 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
2903 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2904 sizeof(struct ceph_filelock), GFP_NOFS);
2905 if (!flocks) {
2906 err = -ENOMEM;
2907 goto out_free;
2908 }
2909 err = ceph_encode_locks_to_buffer(inode, flocks,
2910 num_fcntl_locks,
2911 num_flock_locks);
2912 if (err) {
2913 kfree(flocks);
2914 if (err == -ENOSPC)
2915 goto encode_again;
2916 goto out_free;
2917 }
2918
2919 if (recon_state->msg_version >= 3) {
2920 /* version, compat_version and struct_len */
2921 total_len = 2 * sizeof(u8) + sizeof(u32);
2922 struct_v = 2;
2923 }
2924 /*
2925 * number of encoded locks is stable, so copy to pagelist
2926 */
2927 struct_len = 2 * sizeof(u32) +
2928 (num_fcntl_locks + num_flock_locks) *
2929 sizeof(struct ceph_filelock);
2930 rec.v2.flock_len = cpu_to_le32(struct_len);
2931
2932 struct_len += sizeof(rec.v2);
2933 struct_len += sizeof(u32) + pathlen;
2934
2935 if (struct_v >= 2)
2936 struct_len += sizeof(u64); /* snap_follows */
2937
2938 total_len += struct_len;
2939 err = ceph_pagelist_reserve(pagelist, total_len);
2940
2941 if (!err) {
2942 if (recon_state->msg_version >= 3) {
2943 ceph_pagelist_encode_8(pagelist, struct_v);
2944 ceph_pagelist_encode_8(pagelist, 1);
2945 ceph_pagelist_encode_32(pagelist, struct_len);
2946 }
2947 ceph_pagelist_encode_string(pagelist, path, pathlen);
2948 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
2949 ceph_locks_to_pagelist(flocks, pagelist,
2950 num_fcntl_locks,
2951 num_flock_locks);
2952 if (struct_v >= 2)
2953 ceph_pagelist_encode_64(pagelist, snap_follows);
2954 }
2955 kfree(flocks);
2956 } else {
2957 size_t size = sizeof(u32) + pathlen + sizeof(rec.v1);
2958 err = ceph_pagelist_reserve(pagelist, size);
2959 if (!err) {
2960 ceph_pagelist_encode_string(pagelist, path, pathlen);
2961 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
2962 }
2963 }
2964
2965 recon_state->nr_caps++;
2966 out_free:
2967 kfree(path);
2968 out_dput:
2969 dput(dentry);
2970 return err;
2971 }
2972
2973
2974 /*
2975 * If an MDS fails and recovers, clients need to reconnect in order to
2976 * reestablish shared state. This includes all caps issued through
2977 * this session _and_ the snap_realm hierarchy. Because it's not
2978 * clear which snap realms the mds cares about, we send everything we
2979 * know about.. that ensures we'll then get any new info the
2980 * recovering MDS might have.
2981 *
2982 * This is a relatively heavyweight operation, but it's rare.
2983 *
2984 * called with mdsc->mutex held.
2985 */
2986 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2987 struct ceph_mds_session *session)
2988 {
2989 struct ceph_msg *reply;
2990 struct rb_node *p;
2991 int mds = session->s_mds;
2992 int err = -ENOMEM;
2993 int s_nr_caps;
2994 struct ceph_pagelist *pagelist;
2995 struct ceph_reconnect_state recon_state;
2996
2997 pr_info("mds%d reconnect start\n", mds);
2998
2999 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
3000 if (!pagelist)
3001 goto fail_nopagelist;
3002 ceph_pagelist_init(pagelist);
3003
3004 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
3005 if (!reply)
3006 goto fail_nomsg;
3007
3008 mutex_lock(&session->s_mutex);
3009 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
3010 session->s_seq = 0;
3011
3012 dout("session %p state %s\n", session,
3013 ceph_session_state_name(session->s_state));
3014
3015 spin_lock(&session->s_gen_ttl_lock);
3016 session->s_cap_gen++;
3017 spin_unlock(&session->s_gen_ttl_lock);
3018
3019 spin_lock(&session->s_cap_lock);
3020 /* don't know if session is readonly */
3021 session->s_readonly = 0;
3022 /*
3023 * notify __ceph_remove_cap() that we are composing cap reconnect.
3024 * If a cap get released before being added to the cap reconnect,
3025 * __ceph_remove_cap() should skip queuing cap release.
3026 */
3027 session->s_cap_reconnect = 1;
3028 /* drop old cap expires; we're about to reestablish that state */
3029 cleanup_cap_releases(mdsc, session);
3030
3031 /* trim unused caps to reduce MDS's cache rejoin time */
3032 if (mdsc->fsc->sb->s_root)
3033 shrink_dcache_parent(mdsc->fsc->sb->s_root);
3034
3035 ceph_con_close(&session->s_con);
3036 ceph_con_open(&session->s_con,
3037 CEPH_ENTITY_TYPE_MDS, mds,
3038 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
3039
3040 /* replay unsafe requests */
3041 replay_unsafe_requests(mdsc, session);
3042
3043 down_read(&mdsc->snap_rwsem);
3044
3045 /* traverse this session's caps */
3046 s_nr_caps = session->s_nr_caps;
3047 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
3048 if (err)
3049 goto fail;
3050
3051 recon_state.nr_caps = 0;
3052 recon_state.pagelist = pagelist;
3053 if (session->s_con.peer_features & CEPH_FEATURE_MDSENC)
3054 recon_state.msg_version = 3;
3055 else if (session->s_con.peer_features & CEPH_FEATURE_FLOCK)
3056 recon_state.msg_version = 2;
3057 else
3058 recon_state.msg_version = 1;
3059 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
3060 if (err < 0)
3061 goto fail;
3062
3063 spin_lock(&session->s_cap_lock);
3064 session->s_cap_reconnect = 0;
3065 spin_unlock(&session->s_cap_lock);
3066
3067 /*
3068 * snaprealms. we provide mds with the ino, seq (version), and
3069 * parent for all of our realms. If the mds has any newer info,
3070 * it will tell us.
3071 */
3072 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3073 struct ceph_snap_realm *realm =
3074 rb_entry(p, struct ceph_snap_realm, node);
3075 struct ceph_mds_snaprealm_reconnect sr_rec;
3076
3077 dout(" adding snap realm %llx seq %lld parent %llx\n",
3078 realm->ino, realm->seq, realm->parent_ino);
3079 sr_rec.ino = cpu_to_le64(realm->ino);
3080 sr_rec.seq = cpu_to_le64(realm->seq);
3081 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3082 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3083 if (err)
3084 goto fail;
3085 }
3086
3087 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
3088
3089 /* raced with cap release? */
3090 if (s_nr_caps != recon_state.nr_caps) {
3091 struct page *page = list_first_entry(&pagelist->head,
3092 struct page, lru);
3093 __le32 *addr = kmap_atomic(page);
3094 *addr = cpu_to_le32(recon_state.nr_caps);
3095 kunmap_atomic(addr);
3096 }
3097
3098 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3099 ceph_msg_data_add_pagelist(reply, pagelist);
3100
3101 ceph_early_kick_flushing_caps(mdsc, session);
3102
3103 ceph_con_send(&session->s_con, reply);
3104
3105 mutex_unlock(&session->s_mutex);
3106
3107 mutex_lock(&mdsc->mutex);
3108 __wake_requests(mdsc, &session->s_waiting);
3109 mutex_unlock(&mdsc->mutex);
3110
3111 up_read(&mdsc->snap_rwsem);
3112 return;
3113
3114 fail:
3115 ceph_msg_put(reply);
3116 up_read(&mdsc->snap_rwsem);
3117 mutex_unlock(&session->s_mutex);
3118 fail_nomsg:
3119 ceph_pagelist_release(pagelist);
3120 fail_nopagelist:
3121 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
3122 return;
3123 }
3124
3125
3126 /*
3127 * compare old and new mdsmaps, kicking requests
3128 * and closing out old connections as necessary
3129 *
3130 * called under mdsc->mutex.
3131 */
3132 static void check_new_map(struct ceph_mds_client *mdsc,
3133 struct ceph_mdsmap *newmap,
3134 struct ceph_mdsmap *oldmap)
3135 {
3136 int i;
3137 int oldstate, newstate;
3138 struct ceph_mds_session *s;
3139
3140 dout("check_new_map new %u old %u\n",
3141 newmap->m_epoch, oldmap->m_epoch);
3142
3143 for (i = 0; i < oldmap->m_num_mds && i < mdsc->max_sessions; i++) {
3144 if (!mdsc->sessions[i])
3145 continue;
3146 s = mdsc->sessions[i];
3147 oldstate = ceph_mdsmap_get_state(oldmap, i);
3148 newstate = ceph_mdsmap_get_state(newmap, i);
3149
3150 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3151 i, ceph_mds_state_name(oldstate),
3152 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
3153 ceph_mds_state_name(newstate),
3154 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
3155 ceph_session_state_name(s->s_state));
3156
3157 if (i >= newmap->m_num_mds ||
3158 memcmp(ceph_mdsmap_get_addr(oldmap, i),
3159 ceph_mdsmap_get_addr(newmap, i),
3160 sizeof(struct ceph_entity_addr))) {
3161 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3162 /* the session never opened, just close it
3163 * out now */
3164 get_session(s);
3165 __unregister_session(mdsc, s);
3166 __wake_requests(mdsc, &s->s_waiting);
3167 ceph_put_mds_session(s);
3168 } else if (i >= newmap->m_num_mds) {
3169 /* force close session for stopped mds */
3170 get_session(s);
3171 __unregister_session(mdsc, s);
3172 __wake_requests(mdsc, &s->s_waiting);
3173 kick_requests(mdsc, i);
3174 mutex_unlock(&mdsc->mutex);
3175
3176 mutex_lock(&s->s_mutex);
3177 cleanup_session_requests(mdsc, s);
3178 remove_session_caps(s);
3179 mutex_unlock(&s->s_mutex);
3180
3181 ceph_put_mds_session(s);
3182
3183 mutex_lock(&mdsc->mutex);
3184 } else {
3185 /* just close it */
3186 mutex_unlock(&mdsc->mutex);
3187 mutex_lock(&s->s_mutex);
3188 mutex_lock(&mdsc->mutex);
3189 ceph_con_close(&s->s_con);
3190 mutex_unlock(&s->s_mutex);
3191 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3192 }
3193 } else if (oldstate == newstate) {
3194 continue; /* nothing new with this mds */
3195 }
3196
3197 /*
3198 * send reconnect?
3199 */
3200 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
3201 newstate >= CEPH_MDS_STATE_RECONNECT) {
3202 mutex_unlock(&mdsc->mutex);
3203 send_mds_reconnect(mdsc, s);
3204 mutex_lock(&mdsc->mutex);
3205 }
3206
3207 /*
3208 * kick request on any mds that has gone active.
3209 */
3210 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3211 newstate >= CEPH_MDS_STATE_ACTIVE) {
3212 if (oldstate != CEPH_MDS_STATE_CREATING &&
3213 oldstate != CEPH_MDS_STATE_STARTING)
3214 pr_info("mds%d recovery completed\n", s->s_mds);
3215 kick_requests(mdsc, i);
3216 ceph_kick_flushing_caps(mdsc, s);
3217 wake_up_session_caps(s, 1);
3218 }
3219 }
3220
3221 for (i = 0; i < newmap->m_num_mds && i < mdsc->max_sessions; i++) {
3222 s = mdsc->sessions[i];
3223 if (!s)
3224 continue;
3225 if (!ceph_mdsmap_is_laggy(newmap, i))
3226 continue;
3227 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3228 s->s_state == CEPH_MDS_SESSION_HUNG ||
3229 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3230 dout(" connecting to export targets of laggy mds%d\n",
3231 i);
3232 __open_export_target_sessions(mdsc, s);
3233 }
3234 }
3235 }
3236
3237
3238
3239 /*
3240 * leases
3241 */
3242
3243 /*
3244 * caller must hold session s_mutex, dentry->d_lock
3245 */
3246 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3247 {
3248 struct ceph_dentry_info *di = ceph_dentry(dentry);
3249
3250 ceph_put_mds_session(di->lease_session);
3251 di->lease_session = NULL;
3252 }
3253
3254 static void handle_lease(struct ceph_mds_client *mdsc,
3255 struct ceph_mds_session *session,
3256 struct ceph_msg *msg)
3257 {
3258 struct super_block *sb = mdsc->fsc->sb;
3259 struct inode *inode;
3260 struct dentry *parent, *dentry;
3261 struct ceph_dentry_info *di;
3262 int mds = session->s_mds;
3263 struct ceph_mds_lease *h = msg->front.iov_base;
3264 u32 seq;
3265 struct ceph_vino vino;
3266 struct qstr dname;
3267 int release = 0;
3268
3269 dout("handle_lease from mds%d\n", mds);
3270
3271 /* decode */
3272 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3273 goto bad;
3274 vino.ino = le64_to_cpu(h->ino);
3275 vino.snap = CEPH_NOSNAP;
3276 seq = le32_to_cpu(h->seq);
3277 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3278 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3279 if (dname.len != get_unaligned_le32(h+1))
3280 goto bad;
3281
3282 /* lookup inode */
3283 inode = ceph_find_inode(sb, vino);
3284 dout("handle_lease %s, ino %llx %p %.*s\n",
3285 ceph_lease_op_name(h->action), vino.ino, inode,
3286 dname.len, dname.name);
3287
3288 mutex_lock(&session->s_mutex);
3289 session->s_seq++;
3290
3291 if (!inode) {
3292 dout("handle_lease no inode %llx\n", vino.ino);
3293 goto release;
3294 }
3295
3296 /* dentry */
3297 parent = d_find_alias(inode);
3298 if (!parent) {
3299 dout("no parent dentry on inode %p\n", inode);
3300 WARN_ON(1);
3301 goto release; /* hrm... */
3302 }
3303 dname.hash = full_name_hash(parent, dname.name, dname.len);
3304 dentry = d_lookup(parent, &dname);
3305 dput(parent);
3306 if (!dentry)
3307 goto release;
3308
3309 spin_lock(&dentry->d_lock);
3310 di = ceph_dentry(dentry);
3311 switch (h->action) {
3312 case CEPH_MDS_LEASE_REVOKE:
3313 if (di->lease_session == session) {
3314 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3315 h->seq = cpu_to_le32(di->lease_seq);
3316 __ceph_mdsc_drop_dentry_lease(dentry);
3317 }
3318 release = 1;
3319 break;
3320
3321 case CEPH_MDS_LEASE_RENEW:
3322 if (di->lease_session == session &&
3323 di->lease_gen == session->s_cap_gen &&
3324 di->lease_renew_from &&
3325 di->lease_renew_after == 0) {
3326 unsigned long duration =
3327 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
3328
3329 di->lease_seq = seq;
3330 di->time = di->lease_renew_from + duration;
3331 di->lease_renew_after = di->lease_renew_from +
3332 (duration >> 1);
3333 di->lease_renew_from = 0;
3334 }
3335 break;
3336 }
3337 spin_unlock(&dentry->d_lock);
3338 dput(dentry);
3339
3340 if (!release)
3341 goto out;
3342
3343 release:
3344 /* let's just reuse the same message */
3345 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3346 ceph_msg_get(msg);
3347 ceph_con_send(&session->s_con, msg);
3348
3349 out:
3350 iput(inode);
3351 mutex_unlock(&session->s_mutex);
3352 return;
3353
3354 bad:
3355 pr_err("corrupt lease message\n");
3356 ceph_msg_dump(msg);
3357 }
3358
3359 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3360 struct inode *inode,
3361 struct dentry *dentry, char action,
3362 u32 seq)
3363 {
3364 struct ceph_msg *msg;
3365 struct ceph_mds_lease *lease;
3366 int len = sizeof(*lease) + sizeof(u32);
3367 int dnamelen = 0;
3368
3369 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3370 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3371 dnamelen = dentry->d_name.len;
3372 len += dnamelen;
3373
3374 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
3375 if (!msg)
3376 return;
3377 lease = msg->front.iov_base;
3378 lease->action = action;
3379 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3380 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3381 lease->seq = cpu_to_le32(seq);
3382 put_unaligned_le32(dnamelen, lease + 1);
3383 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3384
3385 /*
3386 * if this is a preemptive lease RELEASE, no need to
3387 * flush request stream, since the actual request will
3388 * soon follow.
3389 */
3390 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3391
3392 ceph_con_send(&session->s_con, msg);
3393 }
3394
3395 /*
3396 * drop all leases (and dentry refs) in preparation for umount
3397 */
3398 static void drop_leases(struct ceph_mds_client *mdsc)
3399 {
3400 int i;
3401
3402 dout("drop_leases\n");
3403 mutex_lock(&mdsc->mutex);
3404 for (i = 0; i < mdsc->max_sessions; i++) {
3405 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3406 if (!s)
3407 continue;
3408 mutex_unlock(&mdsc->mutex);
3409 mutex_lock(&s->s_mutex);
3410 mutex_unlock(&s->s_mutex);
3411 ceph_put_mds_session(s);
3412 mutex_lock(&mdsc->mutex);
3413 }
3414 mutex_unlock(&mdsc->mutex);
3415 }
3416
3417
3418
3419 /*
3420 * delayed work -- periodically trim expired leases, renew caps with mds
3421 */
3422 static void schedule_delayed(struct ceph_mds_client *mdsc)
3423 {
3424 int delay = 5;
3425 unsigned hz = round_jiffies_relative(HZ * delay);
3426 schedule_delayed_work(&mdsc->delayed_work, hz);
3427 }
3428
3429 static void delayed_work(struct work_struct *work)
3430 {
3431 int i;
3432 struct ceph_mds_client *mdsc =
3433 container_of(work, struct ceph_mds_client, delayed_work.work);
3434 int renew_interval;
3435 int renew_caps;
3436
3437 dout("mdsc delayed_work\n");
3438 ceph_check_delayed_caps(mdsc);
3439
3440 mutex_lock(&mdsc->mutex);
3441 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3442 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3443 mdsc->last_renew_caps);
3444 if (renew_caps)
3445 mdsc->last_renew_caps = jiffies;
3446
3447 for (i = 0; i < mdsc->max_sessions; i++) {
3448 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3449 if (!s)
3450 continue;
3451 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3452 dout("resending session close request for mds%d\n",
3453 s->s_mds);
3454 request_close_session(mdsc, s);
3455 ceph_put_mds_session(s);
3456 continue;
3457 }
3458 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3459 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3460 s->s_state = CEPH_MDS_SESSION_HUNG;
3461 pr_info("mds%d hung\n", s->s_mds);
3462 }
3463 }
3464 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3465 /* this mds is failed or recovering, just wait */
3466 ceph_put_mds_session(s);
3467 continue;
3468 }
3469 mutex_unlock(&mdsc->mutex);
3470
3471 mutex_lock(&s->s_mutex);
3472 if (renew_caps)
3473 send_renew_caps(mdsc, s);
3474 else
3475 ceph_con_keepalive(&s->s_con);
3476 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3477 s->s_state == CEPH_MDS_SESSION_HUNG)
3478 ceph_send_cap_releases(mdsc, s);
3479 mutex_unlock(&s->s_mutex);
3480 ceph_put_mds_session(s);
3481
3482 mutex_lock(&mdsc->mutex);
3483 }
3484 mutex_unlock(&mdsc->mutex);
3485
3486 schedule_delayed(mdsc);
3487 }
3488
3489 int ceph_mdsc_init(struct ceph_fs_client *fsc)
3490
3491 {
3492 struct ceph_mds_client *mdsc;
3493
3494 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3495 if (!mdsc)
3496 return -ENOMEM;
3497 mdsc->fsc = fsc;
3498 fsc->mdsc = mdsc;
3499 mutex_init(&mdsc->mutex);
3500 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3501 if (!mdsc->mdsmap) {
3502 kfree(mdsc);
3503 return -ENOMEM;
3504 }
3505
3506 init_completion(&mdsc->safe_umount_waiters);
3507 init_waitqueue_head(&mdsc->session_close_wq);
3508 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3509 mdsc->sessions = NULL;
3510 atomic_set(&mdsc->num_sessions, 0);
3511 mdsc->max_sessions = 0;
3512 mdsc->stopping = 0;
3513 mdsc->last_snap_seq = 0;
3514 init_rwsem(&mdsc->snap_rwsem);
3515 mdsc->snap_realms = RB_ROOT;
3516 INIT_LIST_HEAD(&mdsc->snap_empty);
3517 spin_lock_init(&mdsc->snap_empty_lock);
3518 mdsc->last_tid = 0;
3519 mdsc->oldest_tid = 0;
3520 mdsc->request_tree = RB_ROOT;
3521 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3522 mdsc->last_renew_caps = jiffies;
3523 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3524 spin_lock_init(&mdsc->cap_delay_lock);
3525 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3526 spin_lock_init(&mdsc->snap_flush_lock);
3527 mdsc->last_cap_flush_tid = 1;
3528 INIT_LIST_HEAD(&mdsc->cap_flush_list);
3529 INIT_LIST_HEAD(&mdsc->cap_dirty);
3530 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3531 mdsc->num_cap_flushing = 0;
3532 spin_lock_init(&mdsc->cap_dirty_lock);
3533 init_waitqueue_head(&mdsc->cap_flushing_wq);
3534 spin_lock_init(&mdsc->dentry_lru_lock);
3535 INIT_LIST_HEAD(&mdsc->dentry_lru);
3536
3537 ceph_caps_init(mdsc);
3538 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3539
3540 init_rwsem(&mdsc->pool_perm_rwsem);
3541 mdsc->pool_perm_tree = RB_ROOT;
3542
3543 strncpy(mdsc->nodename, utsname()->nodename,
3544 sizeof(mdsc->nodename) - 1);
3545 return 0;
3546 }
3547
3548 /*
3549 * Wait for safe replies on open mds requests. If we time out, drop
3550 * all requests from the tree to avoid dangling dentry refs.
3551 */
3552 static void wait_requests(struct ceph_mds_client *mdsc)
3553 {
3554 struct ceph_options *opts = mdsc->fsc->client->options;
3555 struct ceph_mds_request *req;
3556
3557 mutex_lock(&mdsc->mutex);
3558 if (__get_oldest_req(mdsc)) {
3559 mutex_unlock(&mdsc->mutex);
3560
3561 dout("wait_requests waiting for requests\n");
3562 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3563 ceph_timeout_jiffies(opts->mount_timeout));
3564
3565 /* tear down remaining requests */
3566 mutex_lock(&mdsc->mutex);
3567 while ((req = __get_oldest_req(mdsc))) {
3568 dout("wait_requests timed out on tid %llu\n",
3569 req->r_tid);
3570 __unregister_request(mdsc, req);
3571 }
3572 }
3573 mutex_unlock(&mdsc->mutex);
3574 dout("wait_requests done\n");
3575 }
3576
3577 /*
3578 * called before mount is ro, and before dentries are torn down.
3579 * (hmm, does this still race with new lookups?)
3580 */
3581 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3582 {
3583 dout("pre_umount\n");
3584 mdsc->stopping = 1;
3585
3586 drop_leases(mdsc);
3587 ceph_flush_dirty_caps(mdsc);
3588 wait_requests(mdsc);
3589
3590 /*
3591 * wait for reply handlers to drop their request refs and
3592 * their inode/dcache refs
3593 */
3594 ceph_msgr_flush();
3595 }
3596
3597 /*
3598 * wait for all write mds requests to flush.
3599 */
3600 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3601 {
3602 struct ceph_mds_request *req = NULL, *nextreq;
3603 struct rb_node *n;
3604
3605 mutex_lock(&mdsc->mutex);
3606 dout("wait_unsafe_requests want %lld\n", want_tid);
3607 restart:
3608 req = __get_oldest_req(mdsc);
3609 while (req && req->r_tid <= want_tid) {
3610 /* find next request */
3611 n = rb_next(&req->r_node);
3612 if (n)
3613 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3614 else
3615 nextreq = NULL;
3616 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3617 (req->r_op & CEPH_MDS_OP_WRITE)) {
3618 /* write op */
3619 ceph_mdsc_get_request(req);
3620 if (nextreq)
3621 ceph_mdsc_get_request(nextreq);
3622 mutex_unlock(&mdsc->mutex);
3623 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3624 req->r_tid, want_tid);
3625 wait_for_completion(&req->r_safe_completion);
3626 mutex_lock(&mdsc->mutex);
3627 ceph_mdsc_put_request(req);
3628 if (!nextreq)
3629 break; /* next dne before, so we're done! */
3630 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3631 /* next request was removed from tree */
3632 ceph_mdsc_put_request(nextreq);
3633 goto restart;
3634 }
3635 ceph_mdsc_put_request(nextreq); /* won't go away */
3636 }
3637 req = nextreq;
3638 }
3639 mutex_unlock(&mdsc->mutex);
3640 dout("wait_unsafe_requests done\n");
3641 }
3642
3643 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3644 {
3645 u64 want_tid, want_flush;
3646
3647 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3648 return;
3649
3650 dout("sync\n");
3651 mutex_lock(&mdsc->mutex);
3652 want_tid = mdsc->last_tid;
3653 mutex_unlock(&mdsc->mutex);
3654
3655 ceph_flush_dirty_caps(mdsc);
3656 spin_lock(&mdsc->cap_dirty_lock);
3657 want_flush = mdsc->last_cap_flush_tid;
3658 if (!list_empty(&mdsc->cap_flush_list)) {
3659 struct ceph_cap_flush *cf =
3660 list_last_entry(&mdsc->cap_flush_list,
3661 struct ceph_cap_flush, g_list);
3662 cf->wake = true;
3663 }
3664 spin_unlock(&mdsc->cap_dirty_lock);
3665
3666 dout("sync want tid %lld flush_seq %lld\n",
3667 want_tid, want_flush);
3668
3669 wait_unsafe_requests(mdsc, want_tid);
3670 wait_caps_flush(mdsc, want_flush);
3671 }
3672
3673 /*
3674 * true if all sessions are closed, or we force unmount
3675 */
3676 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
3677 {
3678 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3679 return true;
3680 return atomic_read(&mdsc->num_sessions) <= skipped;
3681 }
3682
3683 /*
3684 * called after sb is ro.
3685 */
3686 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3687 {
3688 struct ceph_options *opts = mdsc->fsc->client->options;
3689 struct ceph_mds_session *session;
3690 int i;
3691 int skipped = 0;
3692
3693 dout("close_sessions\n");
3694
3695 /* close sessions */
3696 mutex_lock(&mdsc->mutex);
3697 for (i = 0; i < mdsc->max_sessions; i++) {
3698 session = __ceph_lookup_mds_session(mdsc, i);
3699 if (!session)
3700 continue;
3701 mutex_unlock(&mdsc->mutex);
3702 mutex_lock(&session->s_mutex);
3703 if (__close_session(mdsc, session) <= 0)
3704 skipped++;
3705 mutex_unlock(&session->s_mutex);
3706 ceph_put_mds_session(session);
3707 mutex_lock(&mdsc->mutex);
3708 }
3709 mutex_unlock(&mdsc->mutex);
3710
3711 dout("waiting for sessions to close\n");
3712 wait_event_timeout(mdsc->session_close_wq,
3713 done_closing_sessions(mdsc, skipped),
3714 ceph_timeout_jiffies(opts->mount_timeout));
3715
3716 /* tear down remaining sessions */
3717 mutex_lock(&mdsc->mutex);
3718 for (i = 0; i < mdsc->max_sessions; i++) {
3719 if (mdsc->sessions[i]) {
3720 session = get_session(mdsc->sessions[i]);
3721 __unregister_session(mdsc, session);
3722 mutex_unlock(&mdsc->mutex);
3723 mutex_lock(&session->s_mutex);
3724 remove_session_caps(session);
3725 mutex_unlock(&session->s_mutex);
3726 ceph_put_mds_session(session);
3727 mutex_lock(&mdsc->mutex);
3728 }
3729 }
3730 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3731 mutex_unlock(&mdsc->mutex);
3732
3733 ceph_cleanup_empty_realms(mdsc);
3734
3735 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3736
3737 dout("stopped\n");
3738 }
3739
3740 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3741 {
3742 struct ceph_mds_session *session;
3743 int mds;
3744
3745 dout("force umount\n");
3746
3747 mutex_lock(&mdsc->mutex);
3748 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3749 session = __ceph_lookup_mds_session(mdsc, mds);
3750 if (!session)
3751 continue;
3752 mutex_unlock(&mdsc->mutex);
3753 mutex_lock(&session->s_mutex);
3754 __close_session(mdsc, session);
3755 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3756 cleanup_session_requests(mdsc, session);
3757 remove_session_caps(session);
3758 }
3759 mutex_unlock(&session->s_mutex);
3760 ceph_put_mds_session(session);
3761 mutex_lock(&mdsc->mutex);
3762 kick_requests(mdsc, mds);
3763 }
3764 __wake_requests(mdsc, &mdsc->waiting_for_map);
3765 mutex_unlock(&mdsc->mutex);
3766 }
3767
3768 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3769 {
3770 dout("stop\n");
3771 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3772 if (mdsc->mdsmap)
3773 ceph_mdsmap_destroy(mdsc->mdsmap);
3774 kfree(mdsc->sessions);
3775 ceph_caps_finalize(mdsc);
3776 ceph_pool_perm_destroy(mdsc);
3777 }
3778
3779 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3780 {
3781 struct ceph_mds_client *mdsc = fsc->mdsc;
3782 dout("mdsc_destroy %p\n", mdsc);
3783
3784 /* flush out any connection work with references to us */
3785 ceph_msgr_flush();
3786
3787 ceph_mdsc_stop(mdsc);
3788
3789 fsc->mdsc = NULL;
3790 kfree(mdsc);
3791 dout("mdsc_destroy %p done\n", mdsc);
3792 }
3793
3794 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3795 {
3796 struct ceph_fs_client *fsc = mdsc->fsc;
3797 const char *mds_namespace = fsc->mount_options->mds_namespace;
3798 void *p = msg->front.iov_base;
3799 void *end = p + msg->front.iov_len;
3800 u32 epoch;
3801 u32 map_len;
3802 u32 num_fs;
3803 u32 mount_fscid = (u32)-1;
3804 u8 struct_v, struct_cv;
3805 int err = -EINVAL;
3806
3807 ceph_decode_need(&p, end, sizeof(u32), bad);
3808 epoch = ceph_decode_32(&p);
3809
3810 dout("handle_fsmap epoch %u\n", epoch);
3811
3812 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3813 struct_v = ceph_decode_8(&p);
3814 struct_cv = ceph_decode_8(&p);
3815 map_len = ceph_decode_32(&p);
3816
3817 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
3818 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
3819
3820 num_fs = ceph_decode_32(&p);
3821 while (num_fs-- > 0) {
3822 void *info_p, *info_end;
3823 u32 info_len;
3824 u8 info_v, info_cv;
3825 u32 fscid, namelen;
3826
3827 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3828 info_v = ceph_decode_8(&p);
3829 info_cv = ceph_decode_8(&p);
3830 info_len = ceph_decode_32(&p);
3831 ceph_decode_need(&p, end, info_len, bad);
3832 info_p = p;
3833 info_end = p + info_len;
3834 p = info_end;
3835
3836 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
3837 fscid = ceph_decode_32(&info_p);
3838 namelen = ceph_decode_32(&info_p);
3839 ceph_decode_need(&info_p, info_end, namelen, bad);
3840
3841 if (mds_namespace &&
3842 strlen(mds_namespace) == namelen &&
3843 !strncmp(mds_namespace, (char *)info_p, namelen)) {
3844 mount_fscid = fscid;
3845 break;
3846 }
3847 }
3848
3849 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
3850 if (mount_fscid != (u32)-1) {
3851 fsc->client->monc.fs_cluster_id = mount_fscid;
3852 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
3853 0, true);
3854 ceph_monc_renew_subs(&fsc->client->monc);
3855 } else {
3856 err = -ENOENT;
3857 goto err_out;
3858 }
3859 return;
3860 bad:
3861 pr_err("error decoding fsmap\n");
3862 err_out:
3863 mutex_lock(&mdsc->mutex);
3864 mdsc->mdsmap_err = -ENOENT;
3865 __wake_requests(mdsc, &mdsc->waiting_for_map);
3866 mutex_unlock(&mdsc->mutex);
3867 return;
3868 }
3869
3870 /*
3871 * handle mds map update.
3872 */
3873 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3874 {
3875 u32 epoch;
3876 u32 maplen;
3877 void *p = msg->front.iov_base;
3878 void *end = p + msg->front.iov_len;
3879 struct ceph_mdsmap *newmap, *oldmap;
3880 struct ceph_fsid fsid;
3881 int err = -EINVAL;
3882
3883 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3884 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3885 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3886 return;
3887 epoch = ceph_decode_32(&p);
3888 maplen = ceph_decode_32(&p);
3889 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3890
3891 /* do we need it? */
3892 mutex_lock(&mdsc->mutex);
3893 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3894 dout("handle_map epoch %u <= our %u\n",
3895 epoch, mdsc->mdsmap->m_epoch);
3896 mutex_unlock(&mdsc->mutex);
3897 return;
3898 }
3899
3900 newmap = ceph_mdsmap_decode(&p, end);
3901 if (IS_ERR(newmap)) {
3902 err = PTR_ERR(newmap);
3903 goto bad_unlock;
3904 }
3905
3906 /* swap into place */
3907 if (mdsc->mdsmap) {
3908 oldmap = mdsc->mdsmap;
3909 mdsc->mdsmap = newmap;
3910 check_new_map(mdsc, newmap, oldmap);
3911 ceph_mdsmap_destroy(oldmap);
3912 } else {
3913 mdsc->mdsmap = newmap; /* first mds map */
3914 }
3915 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3916
3917 __wake_requests(mdsc, &mdsc->waiting_for_map);
3918 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
3919 mdsc->mdsmap->m_epoch);
3920
3921 mutex_unlock(&mdsc->mutex);
3922 schedule_delayed(mdsc);
3923 return;
3924
3925 bad_unlock:
3926 mutex_unlock(&mdsc->mutex);
3927 bad:
3928 pr_err("error decoding mdsmap %d\n", err);
3929 return;
3930 }
3931
3932 static struct ceph_connection *con_get(struct ceph_connection *con)
3933 {
3934 struct ceph_mds_session *s = con->private;
3935
3936 if (get_session(s)) {
3937 dout("mdsc con_get %p ok (%d)\n", s, refcount_read(&s->s_ref));
3938 return con;
3939 }
3940 dout("mdsc con_get %p FAIL\n", s);
3941 return NULL;
3942 }
3943
3944 static void con_put(struct ceph_connection *con)
3945 {
3946 struct ceph_mds_session *s = con->private;
3947
3948 dout("mdsc con_put %p (%d)\n", s, refcount_read(&s->s_ref) - 1);
3949 ceph_put_mds_session(s);
3950 }
3951
3952 /*
3953 * if the client is unresponsive for long enough, the mds will kill
3954 * the session entirely.
3955 */
3956 static void peer_reset(struct ceph_connection *con)
3957 {
3958 struct ceph_mds_session *s = con->private;
3959 struct ceph_mds_client *mdsc = s->s_mdsc;
3960
3961 pr_warn("mds%d closed our session\n", s->s_mds);
3962 send_mds_reconnect(mdsc, s);
3963 }
3964
3965 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3966 {
3967 struct ceph_mds_session *s = con->private;
3968 struct ceph_mds_client *mdsc = s->s_mdsc;
3969 int type = le16_to_cpu(msg->hdr.type);
3970
3971 mutex_lock(&mdsc->mutex);
3972 if (__verify_registered_session(mdsc, s) < 0) {
3973 mutex_unlock(&mdsc->mutex);
3974 goto out;
3975 }
3976 mutex_unlock(&mdsc->mutex);
3977
3978 switch (type) {
3979 case CEPH_MSG_MDS_MAP:
3980 ceph_mdsc_handle_mdsmap(mdsc, msg);
3981 break;
3982 case CEPH_MSG_FS_MAP_USER:
3983 ceph_mdsc_handle_fsmap(mdsc, msg);
3984 break;
3985 case CEPH_MSG_CLIENT_SESSION:
3986 handle_session(s, msg);
3987 break;
3988 case CEPH_MSG_CLIENT_REPLY:
3989 handle_reply(s, msg);
3990 break;
3991 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3992 handle_forward(mdsc, s, msg);
3993 break;
3994 case CEPH_MSG_CLIENT_CAPS:
3995 ceph_handle_caps(s, msg);
3996 break;
3997 case CEPH_MSG_CLIENT_SNAP:
3998 ceph_handle_snap(mdsc, s, msg);
3999 break;
4000 case CEPH_MSG_CLIENT_LEASE:
4001 handle_lease(mdsc, s, msg);
4002 break;
4003
4004 default:
4005 pr_err("received unknown message type %d %s\n", type,
4006 ceph_msg_type_name(type));
4007 }
4008 out:
4009 ceph_msg_put(msg);
4010 }
4011
4012 /*
4013 * authentication
4014 */
4015
4016 /*
4017 * Note: returned pointer is the address of a structure that's
4018 * managed separately. Caller must *not* attempt to free it.
4019 */
4020 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
4021 int *proto, int force_new)
4022 {
4023 struct ceph_mds_session *s = con->private;
4024 struct ceph_mds_client *mdsc = s->s_mdsc;
4025 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4026 struct ceph_auth_handshake *auth = &s->s_auth;
4027
4028 if (force_new && auth->authorizer) {
4029 ceph_auth_destroy_authorizer(auth->authorizer);
4030 auth->authorizer = NULL;
4031 }
4032 if (!auth->authorizer) {
4033 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4034 auth);
4035 if (ret)
4036 return ERR_PTR(ret);
4037 } else {
4038 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4039 auth);
4040 if (ret)
4041 return ERR_PTR(ret);
4042 }
4043 *proto = ac->protocol;
4044
4045 return auth;
4046 }
4047
4048
4049 static int verify_authorizer_reply(struct ceph_connection *con)
4050 {
4051 struct ceph_mds_session *s = con->private;
4052 struct ceph_mds_client *mdsc = s->s_mdsc;
4053 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4054
4055 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
4056 }
4057
4058 static int invalidate_authorizer(struct ceph_connection *con)
4059 {
4060 struct ceph_mds_session *s = con->private;
4061 struct ceph_mds_client *mdsc = s->s_mdsc;
4062 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4063
4064 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
4065
4066 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
4067 }
4068
4069 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
4070 struct ceph_msg_header *hdr, int *skip)
4071 {
4072 struct ceph_msg *msg;
4073 int type = (int) le16_to_cpu(hdr->type);
4074 int front_len = (int) le32_to_cpu(hdr->front_len);
4075
4076 if (con->in_msg)
4077 return con->in_msg;
4078
4079 *skip = 0;
4080 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
4081 if (!msg) {
4082 pr_err("unable to allocate msg type %d len %d\n",
4083 type, front_len);
4084 return NULL;
4085 }
4086
4087 return msg;
4088 }
4089
4090 static int mds_sign_message(struct ceph_msg *msg)
4091 {
4092 struct ceph_mds_session *s = msg->con->private;
4093 struct ceph_auth_handshake *auth = &s->s_auth;
4094
4095 return ceph_auth_sign_message(auth, msg);
4096 }
4097
4098 static int mds_check_message_signature(struct ceph_msg *msg)
4099 {
4100 struct ceph_mds_session *s = msg->con->private;
4101 struct ceph_auth_handshake *auth = &s->s_auth;
4102
4103 return ceph_auth_check_message_signature(auth, msg);
4104 }
4105
4106 static const struct ceph_connection_operations mds_con_ops = {
4107 .get = con_get,
4108 .put = con_put,
4109 .dispatch = dispatch,
4110 .get_authorizer = get_authorizer,
4111 .verify_authorizer_reply = verify_authorizer_reply,
4112 .invalidate_authorizer = invalidate_authorizer,
4113 .peer_reset = peer_reset,
4114 .alloc_msg = mds_alloc_msg,
4115 .sign_message = mds_sign_message,
4116 .check_message_signature = mds_check_message_signature,
4117 };
4118
4119 /* eof */
Linux with added FPC-III support