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[mirror_ubuntu-zesty-kernel.git] / fs / ceph / mds_client.c
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/fs.h>
4 #include <linux/wait.h>
5 #include <linux/slab.h>
6 #include <linux/gfp.h>
7 #include <linux/sched.h>
8 #include <linux/debugfs.h>
9 #include <linux/seq_file.h>
10 #include <linux/utsname.h>
11 #include <linux/ratelimit.h>
12
13 #include "super.h"
14 #include "mds_client.h"
15
16 #include <linux/ceph/ceph_features.h>
17 #include <linux/ceph/messenger.h>
18 #include <linux/ceph/decode.h>
19 #include <linux/ceph/pagelist.h>
20 #include <linux/ceph/auth.h>
21 #include <linux/ceph/debugfs.h>
22
23 /*
24 * A cluster of MDS (metadata server) daemons is responsible for
25 * managing the file system namespace (the directory hierarchy and
26 * inodes) and for coordinating shared access to storage. Metadata is
27 * partitioning hierarchically across a number of servers, and that
28 * partition varies over time as the cluster adjusts the distribution
29 * in order to balance load.
30 *
31 * The MDS client is primarily responsible to managing synchronous
32 * metadata requests for operations like open, unlink, and so forth.
33 * If there is a MDS failure, we find out about it when we (possibly
34 * request and) receive a new MDS map, and can resubmit affected
35 * requests.
36 *
37 * For the most part, though, we take advantage of a lossless
38 * communications channel to the MDS, and do not need to worry about
39 * timing out or resubmitting requests.
40 *
41 * We maintain a stateful "session" with each MDS we interact with.
42 * Within each session, we sent periodic heartbeat messages to ensure
43 * any capabilities or leases we have been issues remain valid. If
44 * the session times out and goes stale, our leases and capabilities
45 * are no longer valid.
46 */
47
48 struct ceph_reconnect_state {
49 int nr_caps;
50 struct ceph_pagelist *pagelist;
51 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 }
193 if (num == 0)
194 goto done;
195
196 BUG_ON(!info->dir_entries);
197 if ((unsigned long)(info->dir_entries + num) >
198 (unsigned long)info->dir_entries + info->dir_buf_size) {
199 pr_err("dir contents are larger than expected\n");
200 WARN_ON(1);
201 goto bad;
202 }
203
204 info->dir_nr = num;
205 while (num) {
206 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
207 /* dentry */
208 ceph_decode_need(p, end, sizeof(u32)*2, bad);
209 rde->name_len = ceph_decode_32(p);
210 ceph_decode_need(p, end, rde->name_len, bad);
211 rde->name = *p;
212 *p += rde->name_len;
213 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
214 rde->lease = *p;
215 *p += sizeof(struct ceph_mds_reply_lease);
216
217 /* inode */
218 err = parse_reply_info_in(p, end, &rde->inode, features);
219 if (err < 0)
220 goto out_bad;
221 /* ceph_readdir_prepopulate() will update it */
222 rde->offset = 0;
223 i++;
224 num--;
225 }
226
227 done:
228 if (*p != end)
229 goto bad;
230 return 0;
231
232 bad:
233 err = -EIO;
234 out_bad:
235 pr_err("problem parsing dir contents %d\n", err);
236 return err;
237 }
238
239 /*
240 * parse fcntl F_GETLK results
241 */
242 static int parse_reply_info_filelock(void **p, void *end,
243 struct ceph_mds_reply_info_parsed *info,
244 u64 features)
245 {
246 if (*p + sizeof(*info->filelock_reply) > end)
247 goto bad;
248
249 info->filelock_reply = *p;
250 *p += sizeof(*info->filelock_reply);
251
252 if (unlikely(*p != end))
253 goto bad;
254 return 0;
255
256 bad:
257 return -EIO;
258 }
259
260 /*
261 * parse create results
262 */
263 static int parse_reply_info_create(void **p, void *end,
264 struct ceph_mds_reply_info_parsed *info,
265 u64 features)
266 {
267 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
268 if (*p == end) {
269 info->has_create_ino = false;
270 } else {
271 info->has_create_ino = true;
272 info->ino = ceph_decode_64(p);
273 }
274 }
275
276 if (unlikely(*p != end))
277 goto bad;
278 return 0;
279
280 bad:
281 return -EIO;
282 }
283
284 /*
285 * parse extra results
286 */
287 static int parse_reply_info_extra(void **p, void *end,
288 struct ceph_mds_reply_info_parsed *info,
289 u64 features)
290 {
291 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
292 return parse_reply_info_filelock(p, end, info, features);
293 else if (info->head->op == CEPH_MDS_OP_READDIR ||
294 info->head->op == CEPH_MDS_OP_LSSNAP)
295 return parse_reply_info_dir(p, end, info, features);
296 else if (info->head->op == CEPH_MDS_OP_CREATE)
297 return parse_reply_info_create(p, end, info, features);
298 else
299 return -EIO;
300 }
301
302 /*
303 * parse entire mds reply
304 */
305 static int parse_reply_info(struct ceph_msg *msg,
306 struct ceph_mds_reply_info_parsed *info,
307 u64 features)
308 {
309 void *p, *end;
310 u32 len;
311 int err;
312
313 info->head = msg->front.iov_base;
314 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
315 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
316
317 /* trace */
318 ceph_decode_32_safe(&p, end, len, bad);
319 if (len > 0) {
320 ceph_decode_need(&p, end, len, bad);
321 err = parse_reply_info_trace(&p, p+len, info, features);
322 if (err < 0)
323 goto out_bad;
324 }
325
326 /* extra */
327 ceph_decode_32_safe(&p, end, len, bad);
328 if (len > 0) {
329 ceph_decode_need(&p, end, len, bad);
330 err = parse_reply_info_extra(&p, p+len, info, features);
331 if (err < 0)
332 goto out_bad;
333 }
334
335 /* snap blob */
336 ceph_decode_32_safe(&p, end, len, bad);
337 info->snapblob_len = len;
338 info->snapblob = p;
339 p += len;
340
341 if (p != end)
342 goto bad;
343 return 0;
344
345 bad:
346 err = -EIO;
347 out_bad:
348 pr_err("mds parse_reply err %d\n", err);
349 return err;
350 }
351
352 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
353 {
354 if (!info->dir_entries)
355 return;
356 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
357 }
358
359
360 /*
361 * sessions
362 */
363 const char *ceph_session_state_name(int s)
364 {
365 switch (s) {
366 case CEPH_MDS_SESSION_NEW: return "new";
367 case CEPH_MDS_SESSION_OPENING: return "opening";
368 case CEPH_MDS_SESSION_OPEN: return "open";
369 case CEPH_MDS_SESSION_HUNG: return "hung";
370 case CEPH_MDS_SESSION_CLOSING: return "closing";
371 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
372 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
373 case CEPH_MDS_SESSION_REJECTED: return "rejected";
374 default: return "???";
375 }
376 }
377
378 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
379 {
380 if (atomic_inc_not_zero(&s->s_ref)) {
381 dout("mdsc get_session %p %d -> %d\n", s,
382 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
383 return s;
384 } else {
385 dout("mdsc get_session %p 0 -- FAIL", s);
386 return NULL;
387 }
388 }
389
390 void ceph_put_mds_session(struct ceph_mds_session *s)
391 {
392 dout("mdsc put_session %p %d -> %d\n", s,
393 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
394 if (atomic_dec_and_test(&s->s_ref)) {
395 if (s->s_auth.authorizer)
396 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
397 kfree(s);
398 }
399 }
400
401 /*
402 * called under mdsc->mutex
403 */
404 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
405 int mds)
406 {
407 struct ceph_mds_session *session;
408
409 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
410 return NULL;
411 session = mdsc->sessions[mds];
412 dout("lookup_mds_session %p %d\n", session,
413 atomic_read(&session->s_ref));
414 get_session(session);
415 return session;
416 }
417
418 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
419 {
420 if (mds >= mdsc->max_sessions)
421 return false;
422 return mdsc->sessions[mds];
423 }
424
425 static int __verify_registered_session(struct ceph_mds_client *mdsc,
426 struct ceph_mds_session *s)
427 {
428 if (s->s_mds >= mdsc->max_sessions ||
429 mdsc->sessions[s->s_mds] != s)
430 return -ENOENT;
431 return 0;
432 }
433
434 /*
435 * create+register a new session for given mds.
436 * called under mdsc->mutex.
437 */
438 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
439 int mds)
440 {
441 struct ceph_mds_session *s;
442
443 if (mds >= mdsc->mdsmap->m_max_mds)
444 return ERR_PTR(-EINVAL);
445
446 s = kzalloc(sizeof(*s), GFP_NOFS);
447 if (!s)
448 return ERR_PTR(-ENOMEM);
449 s->s_mdsc = mdsc;
450 s->s_mds = mds;
451 s->s_state = CEPH_MDS_SESSION_NEW;
452 s->s_ttl = 0;
453 s->s_seq = 0;
454 mutex_init(&s->s_mutex);
455
456 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
457
458 spin_lock_init(&s->s_gen_ttl_lock);
459 s->s_cap_gen = 0;
460 s->s_cap_ttl = jiffies - 1;
461
462 spin_lock_init(&s->s_cap_lock);
463 s->s_renew_requested = 0;
464 s->s_renew_seq = 0;
465 INIT_LIST_HEAD(&s->s_caps);
466 s->s_nr_caps = 0;
467 s->s_trim_caps = 0;
468 atomic_set(&s->s_ref, 1);
469 INIT_LIST_HEAD(&s->s_waiting);
470 INIT_LIST_HEAD(&s->s_unsafe);
471 s->s_num_cap_releases = 0;
472 s->s_cap_reconnect = 0;
473 s->s_cap_iterator = NULL;
474 INIT_LIST_HEAD(&s->s_cap_releases);
475 INIT_LIST_HEAD(&s->s_cap_flushing);
476
477 dout("register_session mds%d\n", mds);
478 if (mds >= mdsc->max_sessions) {
479 int newmax = 1 << get_count_order(mds+1);
480 struct ceph_mds_session **sa;
481
482 dout("register_session realloc to %d\n", newmax);
483 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
484 if (sa == NULL)
485 goto fail_realloc;
486 if (mdsc->sessions) {
487 memcpy(sa, mdsc->sessions,
488 mdsc->max_sessions * sizeof(void *));
489 kfree(mdsc->sessions);
490 }
491 mdsc->sessions = sa;
492 mdsc->max_sessions = newmax;
493 }
494 mdsc->sessions[mds] = s;
495 atomic_inc(&mdsc->num_sessions);
496 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
497
498 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
499 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
500
501 return s;
502
503 fail_realloc:
504 kfree(s);
505 return ERR_PTR(-ENOMEM);
506 }
507
508 /*
509 * called under mdsc->mutex
510 */
511 static void __unregister_session(struct ceph_mds_client *mdsc,
512 struct ceph_mds_session *s)
513 {
514 dout("__unregister_session mds%d %p\n", s->s_mds, s);
515 BUG_ON(mdsc->sessions[s->s_mds] != s);
516 mdsc->sessions[s->s_mds] = NULL;
517 ceph_con_close(&s->s_con);
518 ceph_put_mds_session(s);
519 atomic_dec(&mdsc->num_sessions);
520 }
521
522 /*
523 * drop session refs in request.
524 *
525 * should be last request ref, or hold mdsc->mutex
526 */
527 static void put_request_session(struct ceph_mds_request *req)
528 {
529 if (req->r_session) {
530 ceph_put_mds_session(req->r_session);
531 req->r_session = NULL;
532 }
533 }
534
535 void ceph_mdsc_release_request(struct kref *kref)
536 {
537 struct ceph_mds_request *req = container_of(kref,
538 struct ceph_mds_request,
539 r_kref);
540 destroy_reply_info(&req->r_reply_info);
541 if (req->r_request)
542 ceph_msg_put(req->r_request);
543 if (req->r_reply)
544 ceph_msg_put(req->r_reply);
545 if (req->r_inode) {
546 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
547 iput(req->r_inode);
548 }
549 if (req->r_locked_dir)
550 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
551 iput(req->r_target_inode);
552 if (req->r_dentry)
553 dput(req->r_dentry);
554 if (req->r_old_dentry)
555 dput(req->r_old_dentry);
556 if (req->r_old_dentry_dir) {
557 /*
558 * track (and drop pins for) r_old_dentry_dir
559 * separately, since r_old_dentry's d_parent may have
560 * changed between the dir mutex being dropped and
561 * this request being freed.
562 */
563 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
564 CEPH_CAP_PIN);
565 iput(req->r_old_dentry_dir);
566 }
567 kfree(req->r_path1);
568 kfree(req->r_path2);
569 if (req->r_pagelist)
570 ceph_pagelist_release(req->r_pagelist);
571 put_request_session(req);
572 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
573 kfree(req);
574 }
575
576 DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
577
578 /*
579 * lookup session, bump ref if found.
580 *
581 * called under mdsc->mutex.
582 */
583 static struct ceph_mds_request *
584 lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
585 {
586 struct ceph_mds_request *req;
587
588 req = lookup_request(&mdsc->request_tree, tid);
589 if (req)
590 ceph_mdsc_get_request(req);
591
592 return req;
593 }
594
595 /*
596 * Register an in-flight request, and assign a tid. Link to directory
597 * are modifying (if any).
598 *
599 * Called under mdsc->mutex.
600 */
601 static void __register_request(struct ceph_mds_client *mdsc,
602 struct ceph_mds_request *req,
603 struct inode *dir)
604 {
605 req->r_tid = ++mdsc->last_tid;
606 if (req->r_num_caps)
607 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
608 req->r_num_caps);
609 dout("__register_request %p tid %lld\n", req, req->r_tid);
610 ceph_mdsc_get_request(req);
611 insert_request(&mdsc->request_tree, req);
612
613 req->r_uid = current_fsuid();
614 req->r_gid = current_fsgid();
615
616 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
617 mdsc->oldest_tid = req->r_tid;
618
619 if (dir) {
620 ihold(dir);
621 req->r_unsafe_dir = dir;
622 }
623 }
624
625 static void __unregister_request(struct ceph_mds_client *mdsc,
626 struct ceph_mds_request *req)
627 {
628 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
629
630 if (req->r_tid == mdsc->oldest_tid) {
631 struct rb_node *p = rb_next(&req->r_node);
632 mdsc->oldest_tid = 0;
633 while (p) {
634 struct ceph_mds_request *next_req =
635 rb_entry(p, struct ceph_mds_request, r_node);
636 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
637 mdsc->oldest_tid = next_req->r_tid;
638 break;
639 }
640 p = rb_next(p);
641 }
642 }
643
644 erase_request(&mdsc->request_tree, req);
645
646 if (req->r_unsafe_dir && req->r_got_unsafe) {
647 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
648 spin_lock(&ci->i_unsafe_lock);
649 list_del_init(&req->r_unsafe_dir_item);
650 spin_unlock(&ci->i_unsafe_lock);
651 }
652 if (req->r_target_inode && req->r_got_unsafe) {
653 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
654 spin_lock(&ci->i_unsafe_lock);
655 list_del_init(&req->r_unsafe_target_item);
656 spin_unlock(&ci->i_unsafe_lock);
657 }
658
659 if (req->r_unsafe_dir) {
660 iput(req->r_unsafe_dir);
661 req->r_unsafe_dir = NULL;
662 }
663
664 complete_all(&req->r_safe_completion);
665
666 ceph_mdsc_put_request(req);
667 }
668
669 /*
670 * Choose mds to send request to next. If there is a hint set in the
671 * request (e.g., due to a prior forward hint from the mds), use that.
672 * Otherwise, consult frag tree and/or caps to identify the
673 * appropriate mds. If all else fails, choose randomly.
674 *
675 * Called under mdsc->mutex.
676 */
677 static struct dentry *get_nonsnap_parent(struct dentry *dentry)
678 {
679 /*
680 * we don't need to worry about protecting the d_parent access
681 * here because we never renaming inside the snapped namespace
682 * except to resplice to another snapdir, and either the old or new
683 * result is a valid result.
684 */
685 while (!IS_ROOT(dentry) && ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
686 dentry = dentry->d_parent;
687 return dentry;
688 }
689
690 static int __choose_mds(struct ceph_mds_client *mdsc,
691 struct ceph_mds_request *req)
692 {
693 struct inode *inode;
694 struct ceph_inode_info *ci;
695 struct ceph_cap *cap;
696 int mode = req->r_direct_mode;
697 int mds = -1;
698 u32 hash = req->r_direct_hash;
699 bool is_hash = req->r_direct_is_hash;
700
701 /*
702 * is there a specific mds we should try? ignore hint if we have
703 * no session and the mds is not up (active or recovering).
704 */
705 if (req->r_resend_mds >= 0 &&
706 (__have_session(mdsc, req->r_resend_mds) ||
707 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
708 dout("choose_mds using resend_mds mds%d\n",
709 req->r_resend_mds);
710 return req->r_resend_mds;
711 }
712
713 if (mode == USE_RANDOM_MDS)
714 goto random;
715
716 inode = NULL;
717 if (req->r_inode) {
718 inode = req->r_inode;
719 } else if (req->r_dentry) {
720 /* ignore race with rename; old or new d_parent is okay */
721 struct dentry *parent = req->r_dentry->d_parent;
722 struct inode *dir = d_inode(parent);
723
724 if (dir->i_sb != mdsc->fsc->sb) {
725 /* not this fs! */
726 inode = d_inode(req->r_dentry);
727 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
728 /* direct snapped/virtual snapdir requests
729 * based on parent dir inode */
730 struct dentry *dn = get_nonsnap_parent(parent);
731 inode = d_inode(dn);
732 dout("__choose_mds using nonsnap parent %p\n", inode);
733 } else {
734 /* dentry target */
735 inode = d_inode(req->r_dentry);
736 if (!inode || mode == USE_AUTH_MDS) {
737 /* dir + name */
738 inode = dir;
739 hash = ceph_dentry_hash(dir, req->r_dentry);
740 is_hash = true;
741 }
742 }
743 }
744
745 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
746 (int)hash, mode);
747 if (!inode)
748 goto random;
749 ci = ceph_inode(inode);
750
751 if (is_hash && S_ISDIR(inode->i_mode)) {
752 struct ceph_inode_frag frag;
753 int found;
754
755 ceph_choose_frag(ci, hash, &frag, &found);
756 if (found) {
757 if (mode == USE_ANY_MDS && frag.ndist > 0) {
758 u8 r;
759
760 /* choose a random replica */
761 get_random_bytes(&r, 1);
762 r %= frag.ndist;
763 mds = frag.dist[r];
764 dout("choose_mds %p %llx.%llx "
765 "frag %u mds%d (%d/%d)\n",
766 inode, ceph_vinop(inode),
767 frag.frag, mds,
768 (int)r, frag.ndist);
769 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
770 CEPH_MDS_STATE_ACTIVE)
771 return mds;
772 }
773
774 /* since this file/dir wasn't known to be
775 * replicated, then we want to look for the
776 * authoritative mds. */
777 mode = USE_AUTH_MDS;
778 if (frag.mds >= 0) {
779 /* choose auth mds */
780 mds = frag.mds;
781 dout("choose_mds %p %llx.%llx "
782 "frag %u mds%d (auth)\n",
783 inode, ceph_vinop(inode), frag.frag, mds);
784 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
785 CEPH_MDS_STATE_ACTIVE)
786 return mds;
787 }
788 }
789 }
790
791 spin_lock(&ci->i_ceph_lock);
792 cap = NULL;
793 if (mode == USE_AUTH_MDS)
794 cap = ci->i_auth_cap;
795 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
796 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
797 if (!cap) {
798 spin_unlock(&ci->i_ceph_lock);
799 goto random;
800 }
801 mds = cap->session->s_mds;
802 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
803 inode, ceph_vinop(inode), mds,
804 cap == ci->i_auth_cap ? "auth " : "", cap);
805 spin_unlock(&ci->i_ceph_lock);
806 return mds;
807
808 random:
809 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
810 dout("choose_mds chose random mds%d\n", mds);
811 return mds;
812 }
813
814
815 /*
816 * session messages
817 */
818 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
819 {
820 struct ceph_msg *msg;
821 struct ceph_mds_session_head *h;
822
823 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
824 false);
825 if (!msg) {
826 pr_err("create_session_msg ENOMEM creating msg\n");
827 return NULL;
828 }
829 h = msg->front.iov_base;
830 h->op = cpu_to_le32(op);
831 h->seq = cpu_to_le64(seq);
832
833 return msg;
834 }
835
836 /*
837 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
838 * to include additional client metadata fields.
839 */
840 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
841 {
842 struct ceph_msg *msg;
843 struct ceph_mds_session_head *h;
844 int i = -1;
845 int metadata_bytes = 0;
846 int metadata_key_count = 0;
847 struct ceph_options *opt = mdsc->fsc->client->options;
848 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
849 void *p;
850
851 const char* metadata[][2] = {
852 {"hostname", utsname()->nodename},
853 {"kernel_version", utsname()->release},
854 {"entity_id", opt->name ? : ""},
855 {"root", fsopt->server_path ? : "/"},
856 {NULL, NULL}
857 };
858
859 /* Calculate serialized length of metadata */
860 metadata_bytes = 4; /* map length */
861 for (i = 0; metadata[i][0] != NULL; ++i) {
862 metadata_bytes += 8 + strlen(metadata[i][0]) +
863 strlen(metadata[i][1]);
864 metadata_key_count++;
865 }
866
867 /* Allocate the message */
868 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
869 GFP_NOFS, false);
870 if (!msg) {
871 pr_err("create_session_msg ENOMEM creating msg\n");
872 return NULL;
873 }
874 h = msg->front.iov_base;
875 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
876 h->seq = cpu_to_le64(seq);
877
878 /*
879 * Serialize client metadata into waiting buffer space, using
880 * the format that userspace expects for map<string, string>
881 *
882 * ClientSession messages with metadata are v2
883 */
884 msg->hdr.version = cpu_to_le16(2);
885 msg->hdr.compat_version = cpu_to_le16(1);
886
887 /* The write pointer, following the session_head structure */
888 p = msg->front.iov_base + sizeof(*h);
889
890 /* Number of entries in the map */
891 ceph_encode_32(&p, metadata_key_count);
892
893 /* Two length-prefixed strings for each entry in the map */
894 for (i = 0; metadata[i][0] != NULL; ++i) {
895 size_t const key_len = strlen(metadata[i][0]);
896 size_t const val_len = strlen(metadata[i][1]);
897
898 ceph_encode_32(&p, key_len);
899 memcpy(p, metadata[i][0], key_len);
900 p += key_len;
901 ceph_encode_32(&p, val_len);
902 memcpy(p, metadata[i][1], val_len);
903 p += val_len;
904 }
905
906 return msg;
907 }
908
909 /*
910 * send session open request.
911 *
912 * called under mdsc->mutex
913 */
914 static int __open_session(struct ceph_mds_client *mdsc,
915 struct ceph_mds_session *session)
916 {
917 struct ceph_msg *msg;
918 int mstate;
919 int mds = session->s_mds;
920
921 /* wait for mds to go active? */
922 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
923 dout("open_session to mds%d (%s)\n", mds,
924 ceph_mds_state_name(mstate));
925 session->s_state = CEPH_MDS_SESSION_OPENING;
926 session->s_renew_requested = jiffies;
927
928 /* send connect message */
929 msg = create_session_open_msg(mdsc, session->s_seq);
930 if (!msg)
931 return -ENOMEM;
932 ceph_con_send(&session->s_con, msg);
933 return 0;
934 }
935
936 /*
937 * open sessions for any export targets for the given mds
938 *
939 * called under mdsc->mutex
940 */
941 static struct ceph_mds_session *
942 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
943 {
944 struct ceph_mds_session *session;
945
946 session = __ceph_lookup_mds_session(mdsc, target);
947 if (!session) {
948 session = register_session(mdsc, target);
949 if (IS_ERR(session))
950 return session;
951 }
952 if (session->s_state == CEPH_MDS_SESSION_NEW ||
953 session->s_state == CEPH_MDS_SESSION_CLOSING)
954 __open_session(mdsc, session);
955
956 return session;
957 }
958
959 struct ceph_mds_session *
960 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
961 {
962 struct ceph_mds_session *session;
963
964 dout("open_export_target_session to mds%d\n", target);
965
966 mutex_lock(&mdsc->mutex);
967 session = __open_export_target_session(mdsc, target);
968 mutex_unlock(&mdsc->mutex);
969
970 return session;
971 }
972
973 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
974 struct ceph_mds_session *session)
975 {
976 struct ceph_mds_info *mi;
977 struct ceph_mds_session *ts;
978 int i, mds = session->s_mds;
979
980 if (mds >= mdsc->mdsmap->m_max_mds)
981 return;
982
983 mi = &mdsc->mdsmap->m_info[mds];
984 dout("open_export_target_sessions for mds%d (%d targets)\n",
985 session->s_mds, mi->num_export_targets);
986
987 for (i = 0; i < mi->num_export_targets; i++) {
988 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
989 if (!IS_ERR(ts))
990 ceph_put_mds_session(ts);
991 }
992 }
993
994 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
995 struct ceph_mds_session *session)
996 {
997 mutex_lock(&mdsc->mutex);
998 __open_export_target_sessions(mdsc, session);
999 mutex_unlock(&mdsc->mutex);
1000 }
1001
1002 /*
1003 * session caps
1004 */
1005
1006 /* caller holds s_cap_lock, we drop it */
1007 static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
1008 struct ceph_mds_session *session)
1009 __releases(session->s_cap_lock)
1010 {
1011 LIST_HEAD(tmp_list);
1012 list_splice_init(&session->s_cap_releases, &tmp_list);
1013 session->s_num_cap_releases = 0;
1014 spin_unlock(&session->s_cap_lock);
1015
1016 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1017 while (!list_empty(&tmp_list)) {
1018 struct ceph_cap *cap;
1019 /* zero out the in-progress message */
1020 cap = list_first_entry(&tmp_list,
1021 struct ceph_cap, session_caps);
1022 list_del(&cap->session_caps);
1023 ceph_put_cap(mdsc, cap);
1024 }
1025 }
1026
1027 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1028 struct ceph_mds_session *session)
1029 {
1030 struct ceph_mds_request *req;
1031 struct rb_node *p;
1032
1033 dout("cleanup_session_requests mds%d\n", session->s_mds);
1034 mutex_lock(&mdsc->mutex);
1035 while (!list_empty(&session->s_unsafe)) {
1036 req = list_first_entry(&session->s_unsafe,
1037 struct ceph_mds_request, r_unsafe_item);
1038 list_del_init(&req->r_unsafe_item);
1039 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1040 req->r_tid);
1041 __unregister_request(mdsc, req);
1042 }
1043 /* zero r_attempts, so kick_requests() will re-send requests */
1044 p = rb_first(&mdsc->request_tree);
1045 while (p) {
1046 req = rb_entry(p, struct ceph_mds_request, r_node);
1047 p = rb_next(p);
1048 if (req->r_session &&
1049 req->r_session->s_mds == session->s_mds)
1050 req->r_attempts = 0;
1051 }
1052 mutex_unlock(&mdsc->mutex);
1053 }
1054
1055 /*
1056 * Helper to safely iterate over all caps associated with a session, with
1057 * special care taken to handle a racing __ceph_remove_cap().
1058 *
1059 * Caller must hold session s_mutex.
1060 */
1061 static int iterate_session_caps(struct ceph_mds_session *session,
1062 int (*cb)(struct inode *, struct ceph_cap *,
1063 void *), void *arg)
1064 {
1065 struct list_head *p;
1066 struct ceph_cap *cap;
1067 struct inode *inode, *last_inode = NULL;
1068 struct ceph_cap *old_cap = NULL;
1069 int ret;
1070
1071 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1072 spin_lock(&session->s_cap_lock);
1073 p = session->s_caps.next;
1074 while (p != &session->s_caps) {
1075 cap = list_entry(p, struct ceph_cap, session_caps);
1076 inode = igrab(&cap->ci->vfs_inode);
1077 if (!inode) {
1078 p = p->next;
1079 continue;
1080 }
1081 session->s_cap_iterator = cap;
1082 spin_unlock(&session->s_cap_lock);
1083
1084 if (last_inode) {
1085 iput(last_inode);
1086 last_inode = NULL;
1087 }
1088 if (old_cap) {
1089 ceph_put_cap(session->s_mdsc, old_cap);
1090 old_cap = NULL;
1091 }
1092
1093 ret = cb(inode, cap, arg);
1094 last_inode = inode;
1095
1096 spin_lock(&session->s_cap_lock);
1097 p = p->next;
1098 if (cap->ci == NULL) {
1099 dout("iterate_session_caps finishing cap %p removal\n",
1100 cap);
1101 BUG_ON(cap->session != session);
1102 cap->session = NULL;
1103 list_del_init(&cap->session_caps);
1104 session->s_nr_caps--;
1105 if (cap->queue_release) {
1106 list_add_tail(&cap->session_caps,
1107 &session->s_cap_releases);
1108 session->s_num_cap_releases++;
1109 } else {
1110 old_cap = cap; /* put_cap it w/o locks held */
1111 }
1112 }
1113 if (ret < 0)
1114 goto out;
1115 }
1116 ret = 0;
1117 out:
1118 session->s_cap_iterator = NULL;
1119 spin_unlock(&session->s_cap_lock);
1120
1121 iput(last_inode);
1122 if (old_cap)
1123 ceph_put_cap(session->s_mdsc, old_cap);
1124
1125 return ret;
1126 }
1127
1128 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1129 void *arg)
1130 {
1131 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
1132 struct ceph_inode_info *ci = ceph_inode(inode);
1133 LIST_HEAD(to_remove);
1134 bool drop = false;
1135 bool invalidate = false;
1136
1137 dout("removing cap %p, ci is %p, inode is %p\n",
1138 cap, ci, &ci->vfs_inode);
1139 spin_lock(&ci->i_ceph_lock);
1140 __ceph_remove_cap(cap, false);
1141 if (!ci->i_auth_cap) {
1142 struct ceph_cap_flush *cf;
1143 struct ceph_mds_client *mdsc = fsc->mdsc;
1144
1145 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1146
1147 if (ci->i_wrbuffer_ref > 0 &&
1148 ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
1149 invalidate = true;
1150
1151 while (!list_empty(&ci->i_cap_flush_list)) {
1152 cf = list_first_entry(&ci->i_cap_flush_list,
1153 struct ceph_cap_flush, i_list);
1154 list_move(&cf->i_list, &to_remove);
1155 }
1156
1157 spin_lock(&mdsc->cap_dirty_lock);
1158
1159 list_for_each_entry(cf, &to_remove, i_list)
1160 list_del(&cf->g_list);
1161
1162 if (!list_empty(&ci->i_dirty_item)) {
1163 pr_warn_ratelimited(
1164 " dropping dirty %s state for %p %lld\n",
1165 ceph_cap_string(ci->i_dirty_caps),
1166 inode, ceph_ino(inode));
1167 ci->i_dirty_caps = 0;
1168 list_del_init(&ci->i_dirty_item);
1169 drop = true;
1170 }
1171 if (!list_empty(&ci->i_flushing_item)) {
1172 pr_warn_ratelimited(
1173 " dropping dirty+flushing %s state for %p %lld\n",
1174 ceph_cap_string(ci->i_flushing_caps),
1175 inode, ceph_ino(inode));
1176 ci->i_flushing_caps = 0;
1177 list_del_init(&ci->i_flushing_item);
1178 mdsc->num_cap_flushing--;
1179 drop = true;
1180 }
1181 spin_unlock(&mdsc->cap_dirty_lock);
1182
1183 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1184 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
1185 ci->i_prealloc_cap_flush = NULL;
1186 }
1187 }
1188 spin_unlock(&ci->i_ceph_lock);
1189 while (!list_empty(&to_remove)) {
1190 struct ceph_cap_flush *cf;
1191 cf = list_first_entry(&to_remove,
1192 struct ceph_cap_flush, i_list);
1193 list_del(&cf->i_list);
1194 ceph_free_cap_flush(cf);
1195 }
1196
1197 wake_up_all(&ci->i_cap_wq);
1198 if (invalidate)
1199 ceph_queue_invalidate(inode);
1200 if (drop)
1201 iput(inode);
1202 return 0;
1203 }
1204
1205 /*
1206 * caller must hold session s_mutex
1207 */
1208 static void remove_session_caps(struct ceph_mds_session *session)
1209 {
1210 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1211 struct super_block *sb = fsc->sb;
1212 dout("remove_session_caps on %p\n", session);
1213 iterate_session_caps(session, remove_session_caps_cb, fsc);
1214
1215 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1216
1217 spin_lock(&session->s_cap_lock);
1218 if (session->s_nr_caps > 0) {
1219 struct inode *inode;
1220 struct ceph_cap *cap, *prev = NULL;
1221 struct ceph_vino vino;
1222 /*
1223 * iterate_session_caps() skips inodes that are being
1224 * deleted, we need to wait until deletions are complete.
1225 * __wait_on_freeing_inode() is designed for the job,
1226 * but it is not exported, so use lookup inode function
1227 * to access it.
1228 */
1229 while (!list_empty(&session->s_caps)) {
1230 cap = list_entry(session->s_caps.next,
1231 struct ceph_cap, session_caps);
1232 if (cap == prev)
1233 break;
1234 prev = cap;
1235 vino = cap->ci->i_vino;
1236 spin_unlock(&session->s_cap_lock);
1237
1238 inode = ceph_find_inode(sb, vino);
1239 iput(inode);
1240
1241 spin_lock(&session->s_cap_lock);
1242 }
1243 }
1244
1245 // drop cap expires and unlock s_cap_lock
1246 cleanup_cap_releases(session->s_mdsc, session);
1247
1248 BUG_ON(session->s_nr_caps > 0);
1249 BUG_ON(!list_empty(&session->s_cap_flushing));
1250 }
1251
1252 /*
1253 * wake up any threads waiting on this session's caps. if the cap is
1254 * old (didn't get renewed on the client reconnect), remove it now.
1255 *
1256 * caller must hold s_mutex.
1257 */
1258 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1259 void *arg)
1260 {
1261 struct ceph_inode_info *ci = ceph_inode(inode);
1262
1263 if (arg) {
1264 spin_lock(&ci->i_ceph_lock);
1265 ci->i_wanted_max_size = 0;
1266 ci->i_requested_max_size = 0;
1267 spin_unlock(&ci->i_ceph_lock);
1268 }
1269 wake_up_all(&ci->i_cap_wq);
1270 return 0;
1271 }
1272
1273 static void wake_up_session_caps(struct ceph_mds_session *session,
1274 int reconnect)
1275 {
1276 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1277 iterate_session_caps(session, wake_up_session_cb,
1278 (void *)(unsigned long)reconnect);
1279 }
1280
1281 /*
1282 * Send periodic message to MDS renewing all currently held caps. The
1283 * ack will reset the expiration for all caps from this session.
1284 *
1285 * caller holds s_mutex
1286 */
1287 static int send_renew_caps(struct ceph_mds_client *mdsc,
1288 struct ceph_mds_session *session)
1289 {
1290 struct ceph_msg *msg;
1291 int state;
1292
1293 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1294 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1295 pr_info("mds%d caps stale\n", session->s_mds);
1296 session->s_renew_requested = jiffies;
1297
1298 /* do not try to renew caps until a recovering mds has reconnected
1299 * with its clients. */
1300 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1301 if (state < CEPH_MDS_STATE_RECONNECT) {
1302 dout("send_renew_caps ignoring mds%d (%s)\n",
1303 session->s_mds, ceph_mds_state_name(state));
1304 return 0;
1305 }
1306
1307 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1308 ceph_mds_state_name(state));
1309 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1310 ++session->s_renew_seq);
1311 if (!msg)
1312 return -ENOMEM;
1313 ceph_con_send(&session->s_con, msg);
1314 return 0;
1315 }
1316
1317 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1318 struct ceph_mds_session *session, u64 seq)
1319 {
1320 struct ceph_msg *msg;
1321
1322 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1323 session->s_mds, ceph_session_state_name(session->s_state), seq);
1324 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1325 if (!msg)
1326 return -ENOMEM;
1327 ceph_con_send(&session->s_con, msg);
1328 return 0;
1329 }
1330
1331
1332 /*
1333 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1334 *
1335 * Called under session->s_mutex
1336 */
1337 static void renewed_caps(struct ceph_mds_client *mdsc,
1338 struct ceph_mds_session *session, int is_renew)
1339 {
1340 int was_stale;
1341 int wake = 0;
1342
1343 spin_lock(&session->s_cap_lock);
1344 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1345
1346 session->s_cap_ttl = session->s_renew_requested +
1347 mdsc->mdsmap->m_session_timeout*HZ;
1348
1349 if (was_stale) {
1350 if (time_before(jiffies, session->s_cap_ttl)) {
1351 pr_info("mds%d caps renewed\n", session->s_mds);
1352 wake = 1;
1353 } else {
1354 pr_info("mds%d caps still stale\n", session->s_mds);
1355 }
1356 }
1357 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1358 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1359 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1360 spin_unlock(&session->s_cap_lock);
1361
1362 if (wake)
1363 wake_up_session_caps(session, 0);
1364 }
1365
1366 /*
1367 * send a session close request
1368 */
1369 static int request_close_session(struct ceph_mds_client *mdsc,
1370 struct ceph_mds_session *session)
1371 {
1372 struct ceph_msg *msg;
1373
1374 dout("request_close_session mds%d state %s seq %lld\n",
1375 session->s_mds, ceph_session_state_name(session->s_state),
1376 session->s_seq);
1377 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1378 if (!msg)
1379 return -ENOMEM;
1380 ceph_con_send(&session->s_con, msg);
1381 return 1;
1382 }
1383
1384 /*
1385 * Called with s_mutex held.
1386 */
1387 static int __close_session(struct ceph_mds_client *mdsc,
1388 struct ceph_mds_session *session)
1389 {
1390 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1391 return 0;
1392 session->s_state = CEPH_MDS_SESSION_CLOSING;
1393 return request_close_session(mdsc, session);
1394 }
1395
1396 /*
1397 * Trim old(er) caps.
1398 *
1399 * Because we can't cache an inode without one or more caps, we do
1400 * this indirectly: if a cap is unused, we prune its aliases, at which
1401 * point the inode will hopefully get dropped to.
1402 *
1403 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1404 * memory pressure from the MDS, though, so it needn't be perfect.
1405 */
1406 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1407 {
1408 struct ceph_mds_session *session = arg;
1409 struct ceph_inode_info *ci = ceph_inode(inode);
1410 int used, wanted, oissued, mine;
1411
1412 if (session->s_trim_caps <= 0)
1413 return -1;
1414
1415 spin_lock(&ci->i_ceph_lock);
1416 mine = cap->issued | cap->implemented;
1417 used = __ceph_caps_used(ci);
1418 wanted = __ceph_caps_file_wanted(ci);
1419 oissued = __ceph_caps_issued_other(ci, cap);
1420
1421 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1422 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1423 ceph_cap_string(used), ceph_cap_string(wanted));
1424 if (cap == ci->i_auth_cap) {
1425 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1426 !list_empty(&ci->i_cap_snaps))
1427 goto out;
1428 if ((used | wanted) & CEPH_CAP_ANY_WR)
1429 goto out;
1430 }
1431 /* The inode has cached pages, but it's no longer used.
1432 * we can safely drop it */
1433 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1434 !(oissued & CEPH_CAP_FILE_CACHE)) {
1435 used = 0;
1436 oissued = 0;
1437 }
1438 if ((used | wanted) & ~oissued & mine)
1439 goto out; /* we need these caps */
1440
1441 session->s_trim_caps--;
1442 if (oissued) {
1443 /* we aren't the only cap.. just remove us */
1444 __ceph_remove_cap(cap, true);
1445 } else {
1446 /* try dropping referring dentries */
1447 spin_unlock(&ci->i_ceph_lock);
1448 d_prune_aliases(inode);
1449 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1450 inode, cap, atomic_read(&inode->i_count));
1451 return 0;
1452 }
1453
1454 out:
1455 spin_unlock(&ci->i_ceph_lock);
1456 return 0;
1457 }
1458
1459 /*
1460 * Trim session cap count down to some max number.
1461 */
1462 static int trim_caps(struct ceph_mds_client *mdsc,
1463 struct ceph_mds_session *session,
1464 int max_caps)
1465 {
1466 int trim_caps = session->s_nr_caps - max_caps;
1467
1468 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1469 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1470 if (trim_caps > 0) {
1471 session->s_trim_caps = trim_caps;
1472 iterate_session_caps(session, trim_caps_cb, session);
1473 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1474 session->s_mds, session->s_nr_caps, max_caps,
1475 trim_caps - session->s_trim_caps);
1476 session->s_trim_caps = 0;
1477 }
1478
1479 ceph_send_cap_releases(mdsc, session);
1480 return 0;
1481 }
1482
1483 static int check_caps_flush(struct ceph_mds_client *mdsc,
1484 u64 want_flush_tid)
1485 {
1486 int ret = 1;
1487
1488 spin_lock(&mdsc->cap_dirty_lock);
1489 if (!list_empty(&mdsc->cap_flush_list)) {
1490 struct ceph_cap_flush *cf =
1491 list_first_entry(&mdsc->cap_flush_list,
1492 struct ceph_cap_flush, g_list);
1493 if (cf->tid <= want_flush_tid) {
1494 dout("check_caps_flush still flushing tid "
1495 "%llu <= %llu\n", cf->tid, want_flush_tid);
1496 ret = 0;
1497 }
1498 }
1499 spin_unlock(&mdsc->cap_dirty_lock);
1500 return ret;
1501 }
1502
1503 /*
1504 * flush all dirty inode data to disk.
1505 *
1506 * returns true if we've flushed through want_flush_tid
1507 */
1508 static void wait_caps_flush(struct ceph_mds_client *mdsc,
1509 u64 want_flush_tid)
1510 {
1511 dout("check_caps_flush want %llu\n", want_flush_tid);
1512
1513 wait_event(mdsc->cap_flushing_wq,
1514 check_caps_flush(mdsc, want_flush_tid));
1515
1516 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
1517 }
1518
1519 /*
1520 * called under s_mutex
1521 */
1522 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1523 struct ceph_mds_session *session)
1524 {
1525 struct ceph_msg *msg = NULL;
1526 struct ceph_mds_cap_release *head;
1527 struct ceph_mds_cap_item *item;
1528 struct ceph_cap *cap;
1529 LIST_HEAD(tmp_list);
1530 int num_cap_releases;
1531
1532 spin_lock(&session->s_cap_lock);
1533 again:
1534 list_splice_init(&session->s_cap_releases, &tmp_list);
1535 num_cap_releases = session->s_num_cap_releases;
1536 session->s_num_cap_releases = 0;
1537 spin_unlock(&session->s_cap_lock);
1538
1539 while (!list_empty(&tmp_list)) {
1540 if (!msg) {
1541 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1542 PAGE_SIZE, GFP_NOFS, false);
1543 if (!msg)
1544 goto out_err;
1545 head = msg->front.iov_base;
1546 head->num = cpu_to_le32(0);
1547 msg->front.iov_len = sizeof(*head);
1548 }
1549 cap = list_first_entry(&tmp_list, struct ceph_cap,
1550 session_caps);
1551 list_del(&cap->session_caps);
1552 num_cap_releases--;
1553
1554 head = msg->front.iov_base;
1555 le32_add_cpu(&head->num, 1);
1556 item = msg->front.iov_base + msg->front.iov_len;
1557 item->ino = cpu_to_le64(cap->cap_ino);
1558 item->cap_id = cpu_to_le64(cap->cap_id);
1559 item->migrate_seq = cpu_to_le32(cap->mseq);
1560 item->seq = cpu_to_le32(cap->issue_seq);
1561 msg->front.iov_len += sizeof(*item);
1562
1563 ceph_put_cap(mdsc, cap);
1564
1565 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1566 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1567 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1568 ceph_con_send(&session->s_con, msg);
1569 msg = NULL;
1570 }
1571 }
1572
1573 BUG_ON(num_cap_releases != 0);
1574
1575 spin_lock(&session->s_cap_lock);
1576 if (!list_empty(&session->s_cap_releases))
1577 goto again;
1578 spin_unlock(&session->s_cap_lock);
1579
1580 if (msg) {
1581 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1582 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1583 ceph_con_send(&session->s_con, msg);
1584 }
1585 return;
1586 out_err:
1587 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1588 session->s_mds);
1589 spin_lock(&session->s_cap_lock);
1590 list_splice(&tmp_list, &session->s_cap_releases);
1591 session->s_num_cap_releases += num_cap_releases;
1592 spin_unlock(&session->s_cap_lock);
1593 }
1594
1595 /*
1596 * requests
1597 */
1598
1599 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1600 struct inode *dir)
1601 {
1602 struct ceph_inode_info *ci = ceph_inode(dir);
1603 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1604 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1605 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
1606 int order, num_entries;
1607
1608 spin_lock(&ci->i_ceph_lock);
1609 num_entries = ci->i_files + ci->i_subdirs;
1610 spin_unlock(&ci->i_ceph_lock);
1611 num_entries = max(num_entries, 1);
1612 num_entries = min(num_entries, opt->max_readdir);
1613
1614 order = get_order(size * num_entries);
1615 while (order >= 0) {
1616 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
1617 __GFP_NOWARN,
1618 order);
1619 if (rinfo->dir_entries)
1620 break;
1621 order--;
1622 }
1623 if (!rinfo->dir_entries)
1624 return -ENOMEM;
1625
1626 num_entries = (PAGE_SIZE << order) / size;
1627 num_entries = min(num_entries, opt->max_readdir);
1628
1629 rinfo->dir_buf_size = PAGE_SIZE << order;
1630 req->r_num_caps = num_entries + 1;
1631 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1632 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1633 return 0;
1634 }
1635
1636 /*
1637 * Create an mds request.
1638 */
1639 struct ceph_mds_request *
1640 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1641 {
1642 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1643
1644 if (!req)
1645 return ERR_PTR(-ENOMEM);
1646
1647 mutex_init(&req->r_fill_mutex);
1648 req->r_mdsc = mdsc;
1649 req->r_started = jiffies;
1650 req->r_resend_mds = -1;
1651 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1652 INIT_LIST_HEAD(&req->r_unsafe_target_item);
1653 req->r_fmode = -1;
1654 kref_init(&req->r_kref);
1655 RB_CLEAR_NODE(&req->r_node);
1656 INIT_LIST_HEAD(&req->r_wait);
1657 init_completion(&req->r_completion);
1658 init_completion(&req->r_safe_completion);
1659 INIT_LIST_HEAD(&req->r_unsafe_item);
1660
1661 req->r_stamp = current_fs_time(mdsc->fsc->sb);
1662
1663 req->r_op = op;
1664 req->r_direct_mode = mode;
1665 return req;
1666 }
1667
1668 /*
1669 * return oldest (lowest) request, tid in request tree, 0 if none.
1670 *
1671 * called under mdsc->mutex.
1672 */
1673 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1674 {
1675 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1676 return NULL;
1677 return rb_entry(rb_first(&mdsc->request_tree),
1678 struct ceph_mds_request, r_node);
1679 }
1680
1681 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1682 {
1683 return mdsc->oldest_tid;
1684 }
1685
1686 /*
1687 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1688 * on build_path_from_dentry in fs/cifs/dir.c.
1689 *
1690 * If @stop_on_nosnap, generate path relative to the first non-snapped
1691 * inode.
1692 *
1693 * Encode hidden .snap dirs as a double /, i.e.
1694 * foo/.snap/bar -> foo//bar
1695 */
1696 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1697 int stop_on_nosnap)
1698 {
1699 struct dentry *temp;
1700 char *path;
1701 int len, pos;
1702 unsigned seq;
1703
1704 if (dentry == NULL)
1705 return ERR_PTR(-EINVAL);
1706
1707 retry:
1708 len = 0;
1709 seq = read_seqbegin(&rename_lock);
1710 rcu_read_lock();
1711 for (temp = dentry; !IS_ROOT(temp);) {
1712 struct inode *inode = d_inode(temp);
1713 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1714 len++; /* slash only */
1715 else if (stop_on_nosnap && inode &&
1716 ceph_snap(inode) == CEPH_NOSNAP)
1717 break;
1718 else
1719 len += 1 + temp->d_name.len;
1720 temp = temp->d_parent;
1721 }
1722 rcu_read_unlock();
1723 if (len)
1724 len--; /* no leading '/' */
1725
1726 path = kmalloc(len+1, GFP_NOFS);
1727 if (path == NULL)
1728 return ERR_PTR(-ENOMEM);
1729 pos = len;
1730 path[pos] = 0; /* trailing null */
1731 rcu_read_lock();
1732 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1733 struct inode *inode;
1734
1735 spin_lock(&temp->d_lock);
1736 inode = d_inode(temp);
1737 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1738 dout("build_path path+%d: %p SNAPDIR\n",
1739 pos, temp);
1740 } else if (stop_on_nosnap && inode &&
1741 ceph_snap(inode) == CEPH_NOSNAP) {
1742 spin_unlock(&temp->d_lock);
1743 break;
1744 } else {
1745 pos -= temp->d_name.len;
1746 if (pos < 0) {
1747 spin_unlock(&temp->d_lock);
1748 break;
1749 }
1750 strncpy(path + pos, temp->d_name.name,
1751 temp->d_name.len);
1752 }
1753 spin_unlock(&temp->d_lock);
1754 if (pos)
1755 path[--pos] = '/';
1756 temp = temp->d_parent;
1757 }
1758 rcu_read_unlock();
1759 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1760 pr_err("build_path did not end path lookup where "
1761 "expected, namelen is %d, pos is %d\n", len, pos);
1762 /* presumably this is only possible if racing with a
1763 rename of one of the parent directories (we can not
1764 lock the dentries above us to prevent this, but
1765 retrying should be harmless) */
1766 kfree(path);
1767 goto retry;
1768 }
1769
1770 *base = ceph_ino(d_inode(temp));
1771 *plen = len;
1772 dout("build_path on %p %d built %llx '%.*s'\n",
1773 dentry, d_count(dentry), *base, len, path);
1774 return path;
1775 }
1776
1777 static int build_dentry_path(struct dentry *dentry,
1778 const char **ppath, int *ppathlen, u64 *pino,
1779 int *pfreepath)
1780 {
1781 char *path;
1782
1783 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) {
1784 *pino = ceph_ino(d_inode(dentry->d_parent));
1785 *ppath = dentry->d_name.name;
1786 *ppathlen = dentry->d_name.len;
1787 return 0;
1788 }
1789 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1790 if (IS_ERR(path))
1791 return PTR_ERR(path);
1792 *ppath = path;
1793 *pfreepath = 1;
1794 return 0;
1795 }
1796
1797 static int build_inode_path(struct inode *inode,
1798 const char **ppath, int *ppathlen, u64 *pino,
1799 int *pfreepath)
1800 {
1801 struct dentry *dentry;
1802 char *path;
1803
1804 if (ceph_snap(inode) == CEPH_NOSNAP) {
1805 *pino = ceph_ino(inode);
1806 *ppathlen = 0;
1807 return 0;
1808 }
1809 dentry = d_find_alias(inode);
1810 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1811 dput(dentry);
1812 if (IS_ERR(path))
1813 return PTR_ERR(path);
1814 *ppath = path;
1815 *pfreepath = 1;
1816 return 0;
1817 }
1818
1819 /*
1820 * request arguments may be specified via an inode *, a dentry *, or
1821 * an explicit ino+path.
1822 */
1823 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1824 const char *rpath, u64 rino,
1825 const char **ppath, int *pathlen,
1826 u64 *ino, int *freepath)
1827 {
1828 int r = 0;
1829
1830 if (rinode) {
1831 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1832 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1833 ceph_snap(rinode));
1834 } else if (rdentry) {
1835 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1836 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1837 *ppath);
1838 } else if (rpath || rino) {
1839 *ino = rino;
1840 *ppath = rpath;
1841 *pathlen = rpath ? strlen(rpath) : 0;
1842 dout(" path %.*s\n", *pathlen, rpath);
1843 }
1844
1845 return r;
1846 }
1847
1848 /*
1849 * called under mdsc->mutex
1850 */
1851 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1852 struct ceph_mds_request *req,
1853 int mds, bool drop_cap_releases)
1854 {
1855 struct ceph_msg *msg;
1856 struct ceph_mds_request_head *head;
1857 const char *path1 = NULL;
1858 const char *path2 = NULL;
1859 u64 ino1 = 0, ino2 = 0;
1860 int pathlen1 = 0, pathlen2 = 0;
1861 int freepath1 = 0, freepath2 = 0;
1862 int len;
1863 u16 releases;
1864 void *p, *end;
1865 int ret;
1866
1867 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1868 req->r_path1, req->r_ino1.ino,
1869 &path1, &pathlen1, &ino1, &freepath1);
1870 if (ret < 0) {
1871 msg = ERR_PTR(ret);
1872 goto out;
1873 }
1874
1875 ret = set_request_path_attr(NULL, req->r_old_dentry,
1876 req->r_path2, req->r_ino2.ino,
1877 &path2, &pathlen2, &ino2, &freepath2);
1878 if (ret < 0) {
1879 msg = ERR_PTR(ret);
1880 goto out_free1;
1881 }
1882
1883 len = sizeof(*head) +
1884 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
1885 sizeof(struct ceph_timespec);
1886
1887 /* calculate (max) length for cap releases */
1888 len += sizeof(struct ceph_mds_request_release) *
1889 (!!req->r_inode_drop + !!req->r_dentry_drop +
1890 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1891 if (req->r_dentry_drop)
1892 len += req->r_dentry->d_name.len;
1893 if (req->r_old_dentry_drop)
1894 len += req->r_old_dentry->d_name.len;
1895
1896 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1897 if (!msg) {
1898 msg = ERR_PTR(-ENOMEM);
1899 goto out_free2;
1900 }
1901
1902 msg->hdr.version = cpu_to_le16(2);
1903 msg->hdr.tid = cpu_to_le64(req->r_tid);
1904
1905 head = msg->front.iov_base;
1906 p = msg->front.iov_base + sizeof(*head);
1907 end = msg->front.iov_base + msg->front.iov_len;
1908
1909 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1910 head->op = cpu_to_le32(req->r_op);
1911 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1912 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
1913 head->args = req->r_args;
1914
1915 ceph_encode_filepath(&p, end, ino1, path1);
1916 ceph_encode_filepath(&p, end, ino2, path2);
1917
1918 /* make note of release offset, in case we need to replay */
1919 req->r_request_release_offset = p - msg->front.iov_base;
1920
1921 /* cap releases */
1922 releases = 0;
1923 if (req->r_inode_drop)
1924 releases += ceph_encode_inode_release(&p,
1925 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
1926 mds, req->r_inode_drop, req->r_inode_unless, 0);
1927 if (req->r_dentry_drop)
1928 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1929 mds, req->r_dentry_drop, req->r_dentry_unless);
1930 if (req->r_old_dentry_drop)
1931 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1932 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1933 if (req->r_old_inode_drop)
1934 releases += ceph_encode_inode_release(&p,
1935 d_inode(req->r_old_dentry),
1936 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1937
1938 if (drop_cap_releases) {
1939 releases = 0;
1940 p = msg->front.iov_base + req->r_request_release_offset;
1941 }
1942
1943 head->num_releases = cpu_to_le16(releases);
1944
1945 /* time stamp */
1946 {
1947 struct ceph_timespec ts;
1948 ceph_encode_timespec(&ts, &req->r_stamp);
1949 ceph_encode_copy(&p, &ts, sizeof(ts));
1950 }
1951
1952 BUG_ON(p > end);
1953 msg->front.iov_len = p - msg->front.iov_base;
1954 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1955
1956 if (req->r_pagelist) {
1957 struct ceph_pagelist *pagelist = req->r_pagelist;
1958 atomic_inc(&pagelist->refcnt);
1959 ceph_msg_data_add_pagelist(msg, pagelist);
1960 msg->hdr.data_len = cpu_to_le32(pagelist->length);
1961 } else {
1962 msg->hdr.data_len = 0;
1963 }
1964
1965 msg->hdr.data_off = cpu_to_le16(0);
1966
1967 out_free2:
1968 if (freepath2)
1969 kfree((char *)path2);
1970 out_free1:
1971 if (freepath1)
1972 kfree((char *)path1);
1973 out:
1974 return msg;
1975 }
1976
1977 /*
1978 * called under mdsc->mutex if error, under no mutex if
1979 * success.
1980 */
1981 static void complete_request(struct ceph_mds_client *mdsc,
1982 struct ceph_mds_request *req)
1983 {
1984 if (req->r_callback)
1985 req->r_callback(mdsc, req);
1986 else
1987 complete_all(&req->r_completion);
1988 }
1989
1990 /*
1991 * called under mdsc->mutex
1992 */
1993 static int __prepare_send_request(struct ceph_mds_client *mdsc,
1994 struct ceph_mds_request *req,
1995 int mds, bool drop_cap_releases)
1996 {
1997 struct ceph_mds_request_head *rhead;
1998 struct ceph_msg *msg;
1999 int flags = 0;
2000
2001 req->r_attempts++;
2002 if (req->r_inode) {
2003 struct ceph_cap *cap =
2004 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2005
2006 if (cap)
2007 req->r_sent_on_mseq = cap->mseq;
2008 else
2009 req->r_sent_on_mseq = -1;
2010 }
2011 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2012 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2013
2014 if (req->r_got_unsafe) {
2015 void *p;
2016 /*
2017 * Replay. Do not regenerate message (and rebuild
2018 * paths, etc.); just use the original message.
2019 * Rebuilding paths will break for renames because
2020 * d_move mangles the src name.
2021 */
2022 msg = req->r_request;
2023 rhead = msg->front.iov_base;
2024
2025 flags = le32_to_cpu(rhead->flags);
2026 flags |= CEPH_MDS_FLAG_REPLAY;
2027 rhead->flags = cpu_to_le32(flags);
2028
2029 if (req->r_target_inode)
2030 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2031
2032 rhead->num_retry = req->r_attempts - 1;
2033
2034 /* remove cap/dentry releases from message */
2035 rhead->num_releases = 0;
2036
2037 /* time stamp */
2038 p = msg->front.iov_base + req->r_request_release_offset;
2039 {
2040 struct ceph_timespec ts;
2041 ceph_encode_timespec(&ts, &req->r_stamp);
2042 ceph_encode_copy(&p, &ts, sizeof(ts));
2043 }
2044
2045 msg->front.iov_len = p - msg->front.iov_base;
2046 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2047 return 0;
2048 }
2049
2050 if (req->r_request) {
2051 ceph_msg_put(req->r_request);
2052 req->r_request = NULL;
2053 }
2054 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2055 if (IS_ERR(msg)) {
2056 req->r_err = PTR_ERR(msg);
2057 return PTR_ERR(msg);
2058 }
2059 req->r_request = msg;
2060
2061 rhead = msg->front.iov_base;
2062 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2063 if (req->r_got_unsafe)
2064 flags |= CEPH_MDS_FLAG_REPLAY;
2065 if (req->r_locked_dir)
2066 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2067 rhead->flags = cpu_to_le32(flags);
2068 rhead->num_fwd = req->r_num_fwd;
2069 rhead->num_retry = req->r_attempts - 1;
2070 rhead->ino = 0;
2071
2072 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2073 return 0;
2074 }
2075
2076 /*
2077 * send request, or put it on the appropriate wait list.
2078 */
2079 static int __do_request(struct ceph_mds_client *mdsc,
2080 struct ceph_mds_request *req)
2081 {
2082 struct ceph_mds_session *session = NULL;
2083 int mds = -1;
2084 int err = 0;
2085
2086 if (req->r_err || req->r_got_result) {
2087 if (req->r_aborted)
2088 __unregister_request(mdsc, req);
2089 goto out;
2090 }
2091
2092 if (req->r_timeout &&
2093 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2094 dout("do_request timed out\n");
2095 err = -EIO;
2096 goto finish;
2097 }
2098 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2099 dout("do_request forced umount\n");
2100 err = -EIO;
2101 goto finish;
2102 }
2103 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2104 if (mdsc->mdsmap_err) {
2105 err = mdsc->mdsmap_err;
2106 dout("do_request mdsmap err %d\n", err);
2107 goto finish;
2108 }
2109 if (mdsc->mdsmap->m_epoch == 0) {
2110 dout("do_request no mdsmap, waiting for map\n");
2111 list_add(&req->r_wait, &mdsc->waiting_for_map);
2112 goto finish;
2113 }
2114 if (!(mdsc->fsc->mount_options->flags &
2115 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2116 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2117 err = -ENOENT;
2118 pr_info("probably no mds server is up\n");
2119 goto finish;
2120 }
2121 }
2122
2123 put_request_session(req);
2124
2125 mds = __choose_mds(mdsc, req);
2126 if (mds < 0 ||
2127 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2128 dout("do_request no mds or not active, waiting for map\n");
2129 list_add(&req->r_wait, &mdsc->waiting_for_map);
2130 goto out;
2131 }
2132
2133 /* get, open session */
2134 session = __ceph_lookup_mds_session(mdsc, mds);
2135 if (!session) {
2136 session = register_session(mdsc, mds);
2137 if (IS_ERR(session)) {
2138 err = PTR_ERR(session);
2139 goto finish;
2140 }
2141 }
2142 req->r_session = get_session(session);
2143
2144 dout("do_request mds%d session %p state %s\n", mds, session,
2145 ceph_session_state_name(session->s_state));
2146 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2147 session->s_state != CEPH_MDS_SESSION_HUNG) {
2148 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2149 err = -EACCES;
2150 goto out_session;
2151 }
2152 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2153 session->s_state == CEPH_MDS_SESSION_CLOSING)
2154 __open_session(mdsc, session);
2155 list_add(&req->r_wait, &session->s_waiting);
2156 goto out_session;
2157 }
2158
2159 /* send request */
2160 req->r_resend_mds = -1; /* forget any previous mds hint */
2161
2162 if (req->r_request_started == 0) /* note request start time */
2163 req->r_request_started = jiffies;
2164
2165 err = __prepare_send_request(mdsc, req, mds, false);
2166 if (!err) {
2167 ceph_msg_get(req->r_request);
2168 ceph_con_send(&session->s_con, req->r_request);
2169 }
2170
2171 out_session:
2172 ceph_put_mds_session(session);
2173 finish:
2174 if (err) {
2175 dout("__do_request early error %d\n", err);
2176 req->r_err = err;
2177 complete_request(mdsc, req);
2178 __unregister_request(mdsc, req);
2179 }
2180 out:
2181 return err;
2182 }
2183
2184 /*
2185 * called under mdsc->mutex
2186 */
2187 static void __wake_requests(struct ceph_mds_client *mdsc,
2188 struct list_head *head)
2189 {
2190 struct ceph_mds_request *req;
2191 LIST_HEAD(tmp_list);
2192
2193 list_splice_init(head, &tmp_list);
2194
2195 while (!list_empty(&tmp_list)) {
2196 req = list_entry(tmp_list.next,
2197 struct ceph_mds_request, r_wait);
2198 list_del_init(&req->r_wait);
2199 dout(" wake request %p tid %llu\n", req, req->r_tid);
2200 __do_request(mdsc, req);
2201 }
2202 }
2203
2204 /*
2205 * Wake up threads with requests pending for @mds, so that they can
2206 * resubmit their requests to a possibly different mds.
2207 */
2208 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2209 {
2210 struct ceph_mds_request *req;
2211 struct rb_node *p = rb_first(&mdsc->request_tree);
2212
2213 dout("kick_requests mds%d\n", mds);
2214 while (p) {
2215 req = rb_entry(p, struct ceph_mds_request, r_node);
2216 p = rb_next(p);
2217 if (req->r_got_unsafe)
2218 continue;
2219 if (req->r_attempts > 0)
2220 continue; /* only new requests */
2221 if (req->r_session &&
2222 req->r_session->s_mds == mds) {
2223 dout(" kicking tid %llu\n", req->r_tid);
2224 list_del_init(&req->r_wait);
2225 __do_request(mdsc, req);
2226 }
2227 }
2228 }
2229
2230 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2231 struct ceph_mds_request *req)
2232 {
2233 dout("submit_request on %p\n", req);
2234 mutex_lock(&mdsc->mutex);
2235 __register_request(mdsc, req, NULL);
2236 __do_request(mdsc, req);
2237 mutex_unlock(&mdsc->mutex);
2238 }
2239
2240 /*
2241 * Synchrously perform an mds request. Take care of all of the
2242 * session setup, forwarding, retry details.
2243 */
2244 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2245 struct inode *dir,
2246 struct ceph_mds_request *req)
2247 {
2248 int err;
2249
2250 dout("do_request on %p\n", req);
2251
2252 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2253 if (req->r_inode)
2254 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2255 if (req->r_locked_dir)
2256 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
2257 if (req->r_old_dentry_dir)
2258 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2259 CEPH_CAP_PIN);
2260
2261 /* issue */
2262 mutex_lock(&mdsc->mutex);
2263 __register_request(mdsc, req, dir);
2264 __do_request(mdsc, req);
2265
2266 if (req->r_err) {
2267 err = req->r_err;
2268 goto out;
2269 }
2270
2271 /* wait */
2272 mutex_unlock(&mdsc->mutex);
2273 dout("do_request waiting\n");
2274 if (!req->r_timeout && req->r_wait_for_completion) {
2275 err = req->r_wait_for_completion(mdsc, req);
2276 } else {
2277 long timeleft = wait_for_completion_killable_timeout(
2278 &req->r_completion,
2279 ceph_timeout_jiffies(req->r_timeout));
2280 if (timeleft > 0)
2281 err = 0;
2282 else if (!timeleft)
2283 err = -EIO; /* timed out */
2284 else
2285 err = timeleft; /* killed */
2286 }
2287 dout("do_request waited, got %d\n", err);
2288 mutex_lock(&mdsc->mutex);
2289
2290 /* only abort if we didn't race with a real reply */
2291 if (req->r_got_result) {
2292 err = le32_to_cpu(req->r_reply_info.head->result);
2293 } else if (err < 0) {
2294 dout("aborted request %lld with %d\n", req->r_tid, err);
2295
2296 /*
2297 * ensure we aren't running concurrently with
2298 * ceph_fill_trace or ceph_readdir_prepopulate, which
2299 * rely on locks (dir mutex) held by our caller.
2300 */
2301 mutex_lock(&req->r_fill_mutex);
2302 req->r_err = err;
2303 req->r_aborted = true;
2304 mutex_unlock(&req->r_fill_mutex);
2305
2306 if (req->r_locked_dir &&
2307 (req->r_op & CEPH_MDS_OP_WRITE))
2308 ceph_invalidate_dir_request(req);
2309 } else {
2310 err = req->r_err;
2311 }
2312
2313 out:
2314 mutex_unlock(&mdsc->mutex);
2315 dout("do_request %p done, result %d\n", req, err);
2316 return err;
2317 }
2318
2319 /*
2320 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2321 * namespace request.
2322 */
2323 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2324 {
2325 struct inode *inode = req->r_locked_dir;
2326
2327 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
2328
2329 ceph_dir_clear_complete(inode);
2330 if (req->r_dentry)
2331 ceph_invalidate_dentry_lease(req->r_dentry);
2332 if (req->r_old_dentry)
2333 ceph_invalidate_dentry_lease(req->r_old_dentry);
2334 }
2335
2336 /*
2337 * Handle mds reply.
2338 *
2339 * We take the session mutex and parse and process the reply immediately.
2340 * This preserves the logical ordering of replies, capabilities, etc., sent
2341 * by the MDS as they are applied to our local cache.
2342 */
2343 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2344 {
2345 struct ceph_mds_client *mdsc = session->s_mdsc;
2346 struct ceph_mds_request *req;
2347 struct ceph_mds_reply_head *head = msg->front.iov_base;
2348 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2349 struct ceph_snap_realm *realm;
2350 u64 tid;
2351 int err, result;
2352 int mds = session->s_mds;
2353
2354 if (msg->front.iov_len < sizeof(*head)) {
2355 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2356 ceph_msg_dump(msg);
2357 return;
2358 }
2359
2360 /* get request, session */
2361 tid = le64_to_cpu(msg->hdr.tid);
2362 mutex_lock(&mdsc->mutex);
2363 req = lookup_get_request(mdsc, tid);
2364 if (!req) {
2365 dout("handle_reply on unknown tid %llu\n", tid);
2366 mutex_unlock(&mdsc->mutex);
2367 return;
2368 }
2369 dout("handle_reply %p\n", req);
2370
2371 /* correct session? */
2372 if (req->r_session != session) {
2373 pr_err("mdsc_handle_reply got %llu on session mds%d"
2374 " not mds%d\n", tid, session->s_mds,
2375 req->r_session ? req->r_session->s_mds : -1);
2376 mutex_unlock(&mdsc->mutex);
2377 goto out;
2378 }
2379
2380 /* dup? */
2381 if ((req->r_got_unsafe && !head->safe) ||
2382 (req->r_got_safe && head->safe)) {
2383 pr_warn("got a dup %s reply on %llu from mds%d\n",
2384 head->safe ? "safe" : "unsafe", tid, mds);
2385 mutex_unlock(&mdsc->mutex);
2386 goto out;
2387 }
2388 if (req->r_got_safe) {
2389 pr_warn("got unsafe after safe on %llu from mds%d\n",
2390 tid, mds);
2391 mutex_unlock(&mdsc->mutex);
2392 goto out;
2393 }
2394
2395 result = le32_to_cpu(head->result);
2396
2397 /*
2398 * Handle an ESTALE
2399 * if we're not talking to the authority, send to them
2400 * if the authority has changed while we weren't looking,
2401 * send to new authority
2402 * Otherwise we just have to return an ESTALE
2403 */
2404 if (result == -ESTALE) {
2405 dout("got ESTALE on request %llu", req->r_tid);
2406 req->r_resend_mds = -1;
2407 if (req->r_direct_mode != USE_AUTH_MDS) {
2408 dout("not using auth, setting for that now");
2409 req->r_direct_mode = USE_AUTH_MDS;
2410 __do_request(mdsc, req);
2411 mutex_unlock(&mdsc->mutex);
2412 goto out;
2413 } else {
2414 int mds = __choose_mds(mdsc, req);
2415 if (mds >= 0 && mds != req->r_session->s_mds) {
2416 dout("but auth changed, so resending");
2417 __do_request(mdsc, req);
2418 mutex_unlock(&mdsc->mutex);
2419 goto out;
2420 }
2421 }
2422 dout("have to return ESTALE on request %llu", req->r_tid);
2423 }
2424
2425
2426 if (head->safe) {
2427 req->r_got_safe = true;
2428 __unregister_request(mdsc, req);
2429
2430 if (req->r_got_unsafe) {
2431 /*
2432 * We already handled the unsafe response, now do the
2433 * cleanup. No need to examine the response; the MDS
2434 * doesn't include any result info in the safe
2435 * response. And even if it did, there is nothing
2436 * useful we could do with a revised return value.
2437 */
2438 dout("got safe reply %llu, mds%d\n", tid, mds);
2439 list_del_init(&req->r_unsafe_item);
2440
2441 /* last unsafe request during umount? */
2442 if (mdsc->stopping && !__get_oldest_req(mdsc))
2443 complete_all(&mdsc->safe_umount_waiters);
2444 mutex_unlock(&mdsc->mutex);
2445 goto out;
2446 }
2447 } else {
2448 req->r_got_unsafe = true;
2449 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2450 if (req->r_unsafe_dir) {
2451 struct ceph_inode_info *ci =
2452 ceph_inode(req->r_unsafe_dir);
2453 spin_lock(&ci->i_unsafe_lock);
2454 list_add_tail(&req->r_unsafe_dir_item,
2455 &ci->i_unsafe_dirops);
2456 spin_unlock(&ci->i_unsafe_lock);
2457 }
2458 }
2459
2460 dout("handle_reply tid %lld result %d\n", tid, result);
2461 rinfo = &req->r_reply_info;
2462 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2463 mutex_unlock(&mdsc->mutex);
2464
2465 mutex_lock(&session->s_mutex);
2466 if (err < 0) {
2467 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2468 ceph_msg_dump(msg);
2469 goto out_err;
2470 }
2471
2472 /* snap trace */
2473 realm = NULL;
2474 if (rinfo->snapblob_len) {
2475 down_write(&mdsc->snap_rwsem);
2476 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2477 rinfo->snapblob + rinfo->snapblob_len,
2478 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2479 &realm);
2480 downgrade_write(&mdsc->snap_rwsem);
2481 } else {
2482 down_read(&mdsc->snap_rwsem);
2483 }
2484
2485 /* insert trace into our cache */
2486 mutex_lock(&req->r_fill_mutex);
2487 current->journal_info = req;
2488 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2489 if (err == 0) {
2490 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2491 req->r_op == CEPH_MDS_OP_LSSNAP))
2492 ceph_readdir_prepopulate(req, req->r_session);
2493 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2494 }
2495 current->journal_info = NULL;
2496 mutex_unlock(&req->r_fill_mutex);
2497
2498 up_read(&mdsc->snap_rwsem);
2499 if (realm)
2500 ceph_put_snap_realm(mdsc, realm);
2501
2502 if (err == 0 && req->r_got_unsafe && req->r_target_inode) {
2503 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2504 spin_lock(&ci->i_unsafe_lock);
2505 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2506 spin_unlock(&ci->i_unsafe_lock);
2507 }
2508 out_err:
2509 mutex_lock(&mdsc->mutex);
2510 if (!req->r_aborted) {
2511 if (err) {
2512 req->r_err = err;
2513 } else {
2514 req->r_reply = ceph_msg_get(msg);
2515 req->r_got_result = true;
2516 }
2517 } else {
2518 dout("reply arrived after request %lld was aborted\n", tid);
2519 }
2520 mutex_unlock(&mdsc->mutex);
2521
2522 mutex_unlock(&session->s_mutex);
2523
2524 /* kick calling process */
2525 complete_request(mdsc, req);
2526 out:
2527 ceph_mdsc_put_request(req);
2528 return;
2529 }
2530
2531
2532
2533 /*
2534 * handle mds notification that our request has been forwarded.
2535 */
2536 static void handle_forward(struct ceph_mds_client *mdsc,
2537 struct ceph_mds_session *session,
2538 struct ceph_msg *msg)
2539 {
2540 struct ceph_mds_request *req;
2541 u64 tid = le64_to_cpu(msg->hdr.tid);
2542 u32 next_mds;
2543 u32 fwd_seq;
2544 int err = -EINVAL;
2545 void *p = msg->front.iov_base;
2546 void *end = p + msg->front.iov_len;
2547
2548 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2549 next_mds = ceph_decode_32(&p);
2550 fwd_seq = ceph_decode_32(&p);
2551
2552 mutex_lock(&mdsc->mutex);
2553 req = lookup_get_request(mdsc, tid);
2554 if (!req) {
2555 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2556 goto out; /* dup reply? */
2557 }
2558
2559 if (req->r_aborted) {
2560 dout("forward tid %llu aborted, unregistering\n", tid);
2561 __unregister_request(mdsc, req);
2562 } else if (fwd_seq <= req->r_num_fwd) {
2563 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2564 tid, next_mds, req->r_num_fwd, fwd_seq);
2565 } else {
2566 /* resend. forward race not possible; mds would drop */
2567 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2568 BUG_ON(req->r_err);
2569 BUG_ON(req->r_got_result);
2570 req->r_attempts = 0;
2571 req->r_num_fwd = fwd_seq;
2572 req->r_resend_mds = next_mds;
2573 put_request_session(req);
2574 __do_request(mdsc, req);
2575 }
2576 ceph_mdsc_put_request(req);
2577 out:
2578 mutex_unlock(&mdsc->mutex);
2579 return;
2580
2581 bad:
2582 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2583 }
2584
2585 /*
2586 * handle a mds session control message
2587 */
2588 static void handle_session(struct ceph_mds_session *session,
2589 struct ceph_msg *msg)
2590 {
2591 struct ceph_mds_client *mdsc = session->s_mdsc;
2592 u32 op;
2593 u64 seq;
2594 int mds = session->s_mds;
2595 struct ceph_mds_session_head *h = msg->front.iov_base;
2596 int wake = 0;
2597
2598 /* decode */
2599 if (msg->front.iov_len != sizeof(*h))
2600 goto bad;
2601 op = le32_to_cpu(h->op);
2602 seq = le64_to_cpu(h->seq);
2603
2604 mutex_lock(&mdsc->mutex);
2605 if (op == CEPH_SESSION_CLOSE)
2606 __unregister_session(mdsc, session);
2607 /* FIXME: this ttl calculation is generous */
2608 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2609 mutex_unlock(&mdsc->mutex);
2610
2611 mutex_lock(&session->s_mutex);
2612
2613 dout("handle_session mds%d %s %p state %s seq %llu\n",
2614 mds, ceph_session_op_name(op), session,
2615 ceph_session_state_name(session->s_state), seq);
2616
2617 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2618 session->s_state = CEPH_MDS_SESSION_OPEN;
2619 pr_info("mds%d came back\n", session->s_mds);
2620 }
2621
2622 switch (op) {
2623 case CEPH_SESSION_OPEN:
2624 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2625 pr_info("mds%d reconnect success\n", session->s_mds);
2626 session->s_state = CEPH_MDS_SESSION_OPEN;
2627 renewed_caps(mdsc, session, 0);
2628 wake = 1;
2629 if (mdsc->stopping)
2630 __close_session(mdsc, session);
2631 break;
2632
2633 case CEPH_SESSION_RENEWCAPS:
2634 if (session->s_renew_seq == seq)
2635 renewed_caps(mdsc, session, 1);
2636 break;
2637
2638 case CEPH_SESSION_CLOSE:
2639 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2640 pr_info("mds%d reconnect denied\n", session->s_mds);
2641 cleanup_session_requests(mdsc, session);
2642 remove_session_caps(session);
2643 wake = 2; /* for good measure */
2644 wake_up_all(&mdsc->session_close_wq);
2645 break;
2646
2647 case CEPH_SESSION_STALE:
2648 pr_info("mds%d caps went stale, renewing\n",
2649 session->s_mds);
2650 spin_lock(&session->s_gen_ttl_lock);
2651 session->s_cap_gen++;
2652 session->s_cap_ttl = jiffies - 1;
2653 spin_unlock(&session->s_gen_ttl_lock);
2654 send_renew_caps(mdsc, session);
2655 break;
2656
2657 case CEPH_SESSION_RECALL_STATE:
2658 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2659 break;
2660
2661 case CEPH_SESSION_FLUSHMSG:
2662 send_flushmsg_ack(mdsc, session, seq);
2663 break;
2664
2665 case CEPH_SESSION_FORCE_RO:
2666 dout("force_session_readonly %p\n", session);
2667 spin_lock(&session->s_cap_lock);
2668 session->s_readonly = true;
2669 spin_unlock(&session->s_cap_lock);
2670 wake_up_session_caps(session, 0);
2671 break;
2672
2673 case CEPH_SESSION_REJECT:
2674 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
2675 pr_info("mds%d rejected session\n", session->s_mds);
2676 session->s_state = CEPH_MDS_SESSION_REJECTED;
2677 cleanup_session_requests(mdsc, session);
2678 remove_session_caps(session);
2679 wake = 2; /* for good measure */
2680 break;
2681
2682 default:
2683 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2684 WARN_ON(1);
2685 }
2686
2687 mutex_unlock(&session->s_mutex);
2688 if (wake) {
2689 mutex_lock(&mdsc->mutex);
2690 __wake_requests(mdsc, &session->s_waiting);
2691 if (wake == 2)
2692 kick_requests(mdsc, mds);
2693 mutex_unlock(&mdsc->mutex);
2694 }
2695 return;
2696
2697 bad:
2698 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2699 (int)msg->front.iov_len);
2700 ceph_msg_dump(msg);
2701 return;
2702 }
2703
2704
2705 /*
2706 * called under session->mutex.
2707 */
2708 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2709 struct ceph_mds_session *session)
2710 {
2711 struct ceph_mds_request *req, *nreq;
2712 struct rb_node *p;
2713 int err;
2714
2715 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2716
2717 mutex_lock(&mdsc->mutex);
2718 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2719 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2720 if (!err) {
2721 ceph_msg_get(req->r_request);
2722 ceph_con_send(&session->s_con, req->r_request);
2723 }
2724 }
2725
2726 /*
2727 * also re-send old requests when MDS enters reconnect stage. So that MDS
2728 * can process completed request in clientreplay stage.
2729 */
2730 p = rb_first(&mdsc->request_tree);
2731 while (p) {
2732 req = rb_entry(p, struct ceph_mds_request, r_node);
2733 p = rb_next(p);
2734 if (req->r_got_unsafe)
2735 continue;
2736 if (req->r_attempts == 0)
2737 continue; /* only old requests */
2738 if (req->r_session &&
2739 req->r_session->s_mds == session->s_mds) {
2740 err = __prepare_send_request(mdsc, req,
2741 session->s_mds, true);
2742 if (!err) {
2743 ceph_msg_get(req->r_request);
2744 ceph_con_send(&session->s_con, req->r_request);
2745 }
2746 }
2747 }
2748 mutex_unlock(&mdsc->mutex);
2749 }
2750
2751 /*
2752 * Encode information about a cap for a reconnect with the MDS.
2753 */
2754 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2755 void *arg)
2756 {
2757 union {
2758 struct ceph_mds_cap_reconnect v2;
2759 struct ceph_mds_cap_reconnect_v1 v1;
2760 } rec;
2761 struct ceph_inode_info *ci;
2762 struct ceph_reconnect_state *recon_state = arg;
2763 struct ceph_pagelist *pagelist = recon_state->pagelist;
2764 char *path;
2765 int pathlen, err;
2766 u64 pathbase;
2767 u64 snap_follows;
2768 struct dentry *dentry;
2769
2770 ci = cap->ci;
2771
2772 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2773 inode, ceph_vinop(inode), cap, cap->cap_id,
2774 ceph_cap_string(cap->issued));
2775 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2776 if (err)
2777 return err;
2778
2779 dentry = d_find_alias(inode);
2780 if (dentry) {
2781 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2782 if (IS_ERR(path)) {
2783 err = PTR_ERR(path);
2784 goto out_dput;
2785 }
2786 } else {
2787 path = NULL;
2788 pathlen = 0;
2789 pathbase = 0;
2790 }
2791
2792 spin_lock(&ci->i_ceph_lock);
2793 cap->seq = 0; /* reset cap seq */
2794 cap->issue_seq = 0; /* and issue_seq */
2795 cap->mseq = 0; /* and migrate_seq */
2796 cap->cap_gen = cap->session->s_cap_gen;
2797
2798 if (recon_state->msg_version >= 2) {
2799 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2800 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2801 rec.v2.issued = cpu_to_le32(cap->issued);
2802 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2803 rec.v2.pathbase = cpu_to_le64(pathbase);
2804 rec.v2.flock_len = 0;
2805 } else {
2806 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2807 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2808 rec.v1.issued = cpu_to_le32(cap->issued);
2809 rec.v1.size = cpu_to_le64(inode->i_size);
2810 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2811 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2812 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2813 rec.v1.pathbase = cpu_to_le64(pathbase);
2814 }
2815
2816 if (list_empty(&ci->i_cap_snaps)) {
2817 snap_follows = 0;
2818 } else {
2819 struct ceph_cap_snap *capsnap =
2820 list_first_entry(&ci->i_cap_snaps,
2821 struct ceph_cap_snap, ci_item);
2822 snap_follows = capsnap->follows;
2823 }
2824 spin_unlock(&ci->i_ceph_lock);
2825
2826 if (recon_state->msg_version >= 2) {
2827 int num_fcntl_locks, num_flock_locks;
2828 struct ceph_filelock *flocks;
2829 size_t struct_len, total_len = 0;
2830 u8 struct_v = 0;
2831
2832 encode_again:
2833 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
2834 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2835 sizeof(struct ceph_filelock), GFP_NOFS);
2836 if (!flocks) {
2837 err = -ENOMEM;
2838 goto out_free;
2839 }
2840 err = ceph_encode_locks_to_buffer(inode, flocks,
2841 num_fcntl_locks,
2842 num_flock_locks);
2843 if (err) {
2844 kfree(flocks);
2845 if (err == -ENOSPC)
2846 goto encode_again;
2847 goto out_free;
2848 }
2849
2850 if (recon_state->msg_version >= 3) {
2851 /* version, compat_version and struct_len */
2852 total_len = 2 * sizeof(u8) + sizeof(u32);
2853 struct_v = 2;
2854 }
2855 /*
2856 * number of encoded locks is stable, so copy to pagelist
2857 */
2858 struct_len = 2 * sizeof(u32) +
2859 (num_fcntl_locks + num_flock_locks) *
2860 sizeof(struct ceph_filelock);
2861 rec.v2.flock_len = cpu_to_le32(struct_len);
2862
2863 struct_len += sizeof(rec.v2);
2864 struct_len += sizeof(u32) + pathlen;
2865
2866 if (struct_v >= 2)
2867 struct_len += sizeof(u64); /* snap_follows */
2868
2869 total_len += struct_len;
2870 err = ceph_pagelist_reserve(pagelist, total_len);
2871
2872 if (!err) {
2873 if (recon_state->msg_version >= 3) {
2874 ceph_pagelist_encode_8(pagelist, struct_v);
2875 ceph_pagelist_encode_8(pagelist, 1);
2876 ceph_pagelist_encode_32(pagelist, struct_len);
2877 }
2878 ceph_pagelist_encode_string(pagelist, path, pathlen);
2879 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
2880 ceph_locks_to_pagelist(flocks, pagelist,
2881 num_fcntl_locks,
2882 num_flock_locks);
2883 if (struct_v >= 2)
2884 ceph_pagelist_encode_64(pagelist, snap_follows);
2885 }
2886 kfree(flocks);
2887 } else {
2888 size_t size = sizeof(u32) + pathlen + sizeof(rec.v1);
2889 err = ceph_pagelist_reserve(pagelist, size);
2890 if (!err) {
2891 ceph_pagelist_encode_string(pagelist, path, pathlen);
2892 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
2893 }
2894 }
2895
2896 recon_state->nr_caps++;
2897 out_free:
2898 kfree(path);
2899 out_dput:
2900 dput(dentry);
2901 return err;
2902 }
2903
2904
2905 /*
2906 * If an MDS fails and recovers, clients need to reconnect in order to
2907 * reestablish shared state. This includes all caps issued through
2908 * this session _and_ the snap_realm hierarchy. Because it's not
2909 * clear which snap realms the mds cares about, we send everything we
2910 * know about.. that ensures we'll then get any new info the
2911 * recovering MDS might have.
2912 *
2913 * This is a relatively heavyweight operation, but it's rare.
2914 *
2915 * called with mdsc->mutex held.
2916 */
2917 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2918 struct ceph_mds_session *session)
2919 {
2920 struct ceph_msg *reply;
2921 struct rb_node *p;
2922 int mds = session->s_mds;
2923 int err = -ENOMEM;
2924 int s_nr_caps;
2925 struct ceph_pagelist *pagelist;
2926 struct ceph_reconnect_state recon_state;
2927
2928 pr_info("mds%d reconnect start\n", mds);
2929
2930 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2931 if (!pagelist)
2932 goto fail_nopagelist;
2933 ceph_pagelist_init(pagelist);
2934
2935 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
2936 if (!reply)
2937 goto fail_nomsg;
2938
2939 mutex_lock(&session->s_mutex);
2940 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2941 session->s_seq = 0;
2942
2943 dout("session %p state %s\n", session,
2944 ceph_session_state_name(session->s_state));
2945
2946 spin_lock(&session->s_gen_ttl_lock);
2947 session->s_cap_gen++;
2948 spin_unlock(&session->s_gen_ttl_lock);
2949
2950 spin_lock(&session->s_cap_lock);
2951 /* don't know if session is readonly */
2952 session->s_readonly = 0;
2953 /*
2954 * notify __ceph_remove_cap() that we are composing cap reconnect.
2955 * If a cap get released before being added to the cap reconnect,
2956 * __ceph_remove_cap() should skip queuing cap release.
2957 */
2958 session->s_cap_reconnect = 1;
2959 /* drop old cap expires; we're about to reestablish that state */
2960 cleanup_cap_releases(mdsc, session);
2961
2962 /* trim unused caps to reduce MDS's cache rejoin time */
2963 if (mdsc->fsc->sb->s_root)
2964 shrink_dcache_parent(mdsc->fsc->sb->s_root);
2965
2966 ceph_con_close(&session->s_con);
2967 ceph_con_open(&session->s_con,
2968 CEPH_ENTITY_TYPE_MDS, mds,
2969 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2970
2971 /* replay unsafe requests */
2972 replay_unsafe_requests(mdsc, session);
2973
2974 down_read(&mdsc->snap_rwsem);
2975
2976 /* traverse this session's caps */
2977 s_nr_caps = session->s_nr_caps;
2978 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
2979 if (err)
2980 goto fail;
2981
2982 recon_state.nr_caps = 0;
2983 recon_state.pagelist = pagelist;
2984 if (session->s_con.peer_features & CEPH_FEATURE_MDSENC)
2985 recon_state.msg_version = 3;
2986 else if (session->s_con.peer_features & CEPH_FEATURE_FLOCK)
2987 recon_state.msg_version = 2;
2988 else
2989 recon_state.msg_version = 1;
2990 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2991 if (err < 0)
2992 goto fail;
2993
2994 spin_lock(&session->s_cap_lock);
2995 session->s_cap_reconnect = 0;
2996 spin_unlock(&session->s_cap_lock);
2997
2998 /*
2999 * snaprealms. we provide mds with the ino, seq (version), and
3000 * parent for all of our realms. If the mds has any newer info,
3001 * it will tell us.
3002 */
3003 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3004 struct ceph_snap_realm *realm =
3005 rb_entry(p, struct ceph_snap_realm, node);
3006 struct ceph_mds_snaprealm_reconnect sr_rec;
3007
3008 dout(" adding snap realm %llx seq %lld parent %llx\n",
3009 realm->ino, realm->seq, realm->parent_ino);
3010 sr_rec.ino = cpu_to_le64(realm->ino);
3011 sr_rec.seq = cpu_to_le64(realm->seq);
3012 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3013 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3014 if (err)
3015 goto fail;
3016 }
3017
3018 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
3019
3020 /* raced with cap release? */
3021 if (s_nr_caps != recon_state.nr_caps) {
3022 struct page *page = list_first_entry(&pagelist->head,
3023 struct page, lru);
3024 __le32 *addr = kmap_atomic(page);
3025 *addr = cpu_to_le32(recon_state.nr_caps);
3026 kunmap_atomic(addr);
3027 }
3028
3029 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3030 ceph_msg_data_add_pagelist(reply, pagelist);
3031
3032 ceph_early_kick_flushing_caps(mdsc, session);
3033
3034 ceph_con_send(&session->s_con, reply);
3035
3036 mutex_unlock(&session->s_mutex);
3037
3038 mutex_lock(&mdsc->mutex);
3039 __wake_requests(mdsc, &session->s_waiting);
3040 mutex_unlock(&mdsc->mutex);
3041
3042 up_read(&mdsc->snap_rwsem);
3043 return;
3044
3045 fail:
3046 ceph_msg_put(reply);
3047 up_read(&mdsc->snap_rwsem);
3048 mutex_unlock(&session->s_mutex);
3049 fail_nomsg:
3050 ceph_pagelist_release(pagelist);
3051 fail_nopagelist:
3052 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
3053 return;
3054 }
3055
3056
3057 /*
3058 * compare old and new mdsmaps, kicking requests
3059 * and closing out old connections as necessary
3060 *
3061 * called under mdsc->mutex.
3062 */
3063 static void check_new_map(struct ceph_mds_client *mdsc,
3064 struct ceph_mdsmap *newmap,
3065 struct ceph_mdsmap *oldmap)
3066 {
3067 int i;
3068 int oldstate, newstate;
3069 struct ceph_mds_session *s;
3070
3071 dout("check_new_map new %u old %u\n",
3072 newmap->m_epoch, oldmap->m_epoch);
3073
3074 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
3075 if (mdsc->sessions[i] == NULL)
3076 continue;
3077 s = mdsc->sessions[i];
3078 oldstate = ceph_mdsmap_get_state(oldmap, i);
3079 newstate = ceph_mdsmap_get_state(newmap, i);
3080
3081 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3082 i, ceph_mds_state_name(oldstate),
3083 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
3084 ceph_mds_state_name(newstate),
3085 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
3086 ceph_session_state_name(s->s_state));
3087
3088 if (i >= newmap->m_max_mds ||
3089 memcmp(ceph_mdsmap_get_addr(oldmap, i),
3090 ceph_mdsmap_get_addr(newmap, i),
3091 sizeof(struct ceph_entity_addr))) {
3092 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3093 /* the session never opened, just close it
3094 * out now */
3095 __wake_requests(mdsc, &s->s_waiting);
3096 __unregister_session(mdsc, s);
3097 } else {
3098 /* just close it */
3099 mutex_unlock(&mdsc->mutex);
3100 mutex_lock(&s->s_mutex);
3101 mutex_lock(&mdsc->mutex);
3102 ceph_con_close(&s->s_con);
3103 mutex_unlock(&s->s_mutex);
3104 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3105 }
3106 } else if (oldstate == newstate) {
3107 continue; /* nothing new with this mds */
3108 }
3109
3110 /*
3111 * send reconnect?
3112 */
3113 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
3114 newstate >= CEPH_MDS_STATE_RECONNECT) {
3115 mutex_unlock(&mdsc->mutex);
3116 send_mds_reconnect(mdsc, s);
3117 mutex_lock(&mdsc->mutex);
3118 }
3119
3120 /*
3121 * kick request on any mds that has gone active.
3122 */
3123 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3124 newstate >= CEPH_MDS_STATE_ACTIVE) {
3125 if (oldstate != CEPH_MDS_STATE_CREATING &&
3126 oldstate != CEPH_MDS_STATE_STARTING)
3127 pr_info("mds%d recovery completed\n", s->s_mds);
3128 kick_requests(mdsc, i);
3129 ceph_kick_flushing_caps(mdsc, s);
3130 wake_up_session_caps(s, 1);
3131 }
3132 }
3133
3134 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
3135 s = mdsc->sessions[i];
3136 if (!s)
3137 continue;
3138 if (!ceph_mdsmap_is_laggy(newmap, i))
3139 continue;
3140 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3141 s->s_state == CEPH_MDS_SESSION_HUNG ||
3142 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3143 dout(" connecting to export targets of laggy mds%d\n",
3144 i);
3145 __open_export_target_sessions(mdsc, s);
3146 }
3147 }
3148 }
3149
3150
3151
3152 /*
3153 * leases
3154 */
3155
3156 /*
3157 * caller must hold session s_mutex, dentry->d_lock
3158 */
3159 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3160 {
3161 struct ceph_dentry_info *di = ceph_dentry(dentry);
3162
3163 ceph_put_mds_session(di->lease_session);
3164 di->lease_session = NULL;
3165 }
3166
3167 static void handle_lease(struct ceph_mds_client *mdsc,
3168 struct ceph_mds_session *session,
3169 struct ceph_msg *msg)
3170 {
3171 struct super_block *sb = mdsc->fsc->sb;
3172 struct inode *inode;
3173 struct dentry *parent, *dentry;
3174 struct ceph_dentry_info *di;
3175 int mds = session->s_mds;
3176 struct ceph_mds_lease *h = msg->front.iov_base;
3177 u32 seq;
3178 struct ceph_vino vino;
3179 struct qstr dname;
3180 int release = 0;
3181
3182 dout("handle_lease from mds%d\n", mds);
3183
3184 /* decode */
3185 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3186 goto bad;
3187 vino.ino = le64_to_cpu(h->ino);
3188 vino.snap = CEPH_NOSNAP;
3189 seq = le32_to_cpu(h->seq);
3190 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3191 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3192 if (dname.len != get_unaligned_le32(h+1))
3193 goto bad;
3194
3195 /* lookup inode */
3196 inode = ceph_find_inode(sb, vino);
3197 dout("handle_lease %s, ino %llx %p %.*s\n",
3198 ceph_lease_op_name(h->action), vino.ino, inode,
3199 dname.len, dname.name);
3200
3201 mutex_lock(&session->s_mutex);
3202 session->s_seq++;
3203
3204 if (inode == NULL) {
3205 dout("handle_lease no inode %llx\n", vino.ino);
3206 goto release;
3207 }
3208
3209 /* dentry */
3210 parent = d_find_alias(inode);
3211 if (!parent) {
3212 dout("no parent dentry on inode %p\n", inode);
3213 WARN_ON(1);
3214 goto release; /* hrm... */
3215 }
3216 dname.hash = full_name_hash(parent, dname.name, dname.len);
3217 dentry = d_lookup(parent, &dname);
3218 dput(parent);
3219 if (!dentry)
3220 goto release;
3221
3222 spin_lock(&dentry->d_lock);
3223 di = ceph_dentry(dentry);
3224 switch (h->action) {
3225 case CEPH_MDS_LEASE_REVOKE:
3226 if (di->lease_session == session) {
3227 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3228 h->seq = cpu_to_le32(di->lease_seq);
3229 __ceph_mdsc_drop_dentry_lease(dentry);
3230 }
3231 release = 1;
3232 break;
3233
3234 case CEPH_MDS_LEASE_RENEW:
3235 if (di->lease_session == session &&
3236 di->lease_gen == session->s_cap_gen &&
3237 di->lease_renew_from &&
3238 di->lease_renew_after == 0) {
3239 unsigned long duration =
3240 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
3241
3242 di->lease_seq = seq;
3243 di->time = di->lease_renew_from + duration;
3244 di->lease_renew_after = di->lease_renew_from +
3245 (duration >> 1);
3246 di->lease_renew_from = 0;
3247 }
3248 break;
3249 }
3250 spin_unlock(&dentry->d_lock);
3251 dput(dentry);
3252
3253 if (!release)
3254 goto out;
3255
3256 release:
3257 /* let's just reuse the same message */
3258 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3259 ceph_msg_get(msg);
3260 ceph_con_send(&session->s_con, msg);
3261
3262 out:
3263 iput(inode);
3264 mutex_unlock(&session->s_mutex);
3265 return;
3266
3267 bad:
3268 pr_err("corrupt lease message\n");
3269 ceph_msg_dump(msg);
3270 }
3271
3272 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3273 struct inode *inode,
3274 struct dentry *dentry, char action,
3275 u32 seq)
3276 {
3277 struct ceph_msg *msg;
3278 struct ceph_mds_lease *lease;
3279 int len = sizeof(*lease) + sizeof(u32);
3280 int dnamelen = 0;
3281
3282 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3283 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3284 dnamelen = dentry->d_name.len;
3285 len += dnamelen;
3286
3287 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
3288 if (!msg)
3289 return;
3290 lease = msg->front.iov_base;
3291 lease->action = action;
3292 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3293 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3294 lease->seq = cpu_to_le32(seq);
3295 put_unaligned_le32(dnamelen, lease + 1);
3296 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3297
3298 /*
3299 * if this is a preemptive lease RELEASE, no need to
3300 * flush request stream, since the actual request will
3301 * soon follow.
3302 */
3303 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3304
3305 ceph_con_send(&session->s_con, msg);
3306 }
3307
3308 /*
3309 * drop all leases (and dentry refs) in preparation for umount
3310 */
3311 static void drop_leases(struct ceph_mds_client *mdsc)
3312 {
3313 int i;
3314
3315 dout("drop_leases\n");
3316 mutex_lock(&mdsc->mutex);
3317 for (i = 0; i < mdsc->max_sessions; i++) {
3318 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3319 if (!s)
3320 continue;
3321 mutex_unlock(&mdsc->mutex);
3322 mutex_lock(&s->s_mutex);
3323 mutex_unlock(&s->s_mutex);
3324 ceph_put_mds_session(s);
3325 mutex_lock(&mdsc->mutex);
3326 }
3327 mutex_unlock(&mdsc->mutex);
3328 }
3329
3330
3331
3332 /*
3333 * delayed work -- periodically trim expired leases, renew caps with mds
3334 */
3335 static void schedule_delayed(struct ceph_mds_client *mdsc)
3336 {
3337 int delay = 5;
3338 unsigned hz = round_jiffies_relative(HZ * delay);
3339 schedule_delayed_work(&mdsc->delayed_work, hz);
3340 }
3341
3342 static void delayed_work(struct work_struct *work)
3343 {
3344 int i;
3345 struct ceph_mds_client *mdsc =
3346 container_of(work, struct ceph_mds_client, delayed_work.work);
3347 int renew_interval;
3348 int renew_caps;
3349
3350 dout("mdsc delayed_work\n");
3351 ceph_check_delayed_caps(mdsc);
3352
3353 mutex_lock(&mdsc->mutex);
3354 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3355 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3356 mdsc->last_renew_caps);
3357 if (renew_caps)
3358 mdsc->last_renew_caps = jiffies;
3359
3360 for (i = 0; i < mdsc->max_sessions; i++) {
3361 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3362 if (s == NULL)
3363 continue;
3364 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3365 dout("resending session close request for mds%d\n",
3366 s->s_mds);
3367 request_close_session(mdsc, s);
3368 ceph_put_mds_session(s);
3369 continue;
3370 }
3371 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3372 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3373 s->s_state = CEPH_MDS_SESSION_HUNG;
3374 pr_info("mds%d hung\n", s->s_mds);
3375 }
3376 }
3377 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3378 /* this mds is failed or recovering, just wait */
3379 ceph_put_mds_session(s);
3380 continue;
3381 }
3382 mutex_unlock(&mdsc->mutex);
3383
3384 mutex_lock(&s->s_mutex);
3385 if (renew_caps)
3386 send_renew_caps(mdsc, s);
3387 else
3388 ceph_con_keepalive(&s->s_con);
3389 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3390 s->s_state == CEPH_MDS_SESSION_HUNG)
3391 ceph_send_cap_releases(mdsc, s);
3392 mutex_unlock(&s->s_mutex);
3393 ceph_put_mds_session(s);
3394
3395 mutex_lock(&mdsc->mutex);
3396 }
3397 mutex_unlock(&mdsc->mutex);
3398
3399 schedule_delayed(mdsc);
3400 }
3401
3402 int ceph_mdsc_init(struct ceph_fs_client *fsc)
3403
3404 {
3405 struct ceph_mds_client *mdsc;
3406
3407 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3408 if (!mdsc)
3409 return -ENOMEM;
3410 mdsc->fsc = fsc;
3411 fsc->mdsc = mdsc;
3412 mutex_init(&mdsc->mutex);
3413 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3414 if (mdsc->mdsmap == NULL) {
3415 kfree(mdsc);
3416 return -ENOMEM;
3417 }
3418
3419 init_completion(&mdsc->safe_umount_waiters);
3420 init_waitqueue_head(&mdsc->session_close_wq);
3421 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3422 mdsc->sessions = NULL;
3423 atomic_set(&mdsc->num_sessions, 0);
3424 mdsc->max_sessions = 0;
3425 mdsc->stopping = 0;
3426 mdsc->last_snap_seq = 0;
3427 init_rwsem(&mdsc->snap_rwsem);
3428 mdsc->snap_realms = RB_ROOT;
3429 INIT_LIST_HEAD(&mdsc->snap_empty);
3430 spin_lock_init(&mdsc->snap_empty_lock);
3431 mdsc->last_tid = 0;
3432 mdsc->oldest_tid = 0;
3433 mdsc->request_tree = RB_ROOT;
3434 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3435 mdsc->last_renew_caps = jiffies;
3436 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3437 spin_lock_init(&mdsc->cap_delay_lock);
3438 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3439 spin_lock_init(&mdsc->snap_flush_lock);
3440 mdsc->last_cap_flush_tid = 1;
3441 INIT_LIST_HEAD(&mdsc->cap_flush_list);
3442 INIT_LIST_HEAD(&mdsc->cap_dirty);
3443 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3444 mdsc->num_cap_flushing = 0;
3445 spin_lock_init(&mdsc->cap_dirty_lock);
3446 init_waitqueue_head(&mdsc->cap_flushing_wq);
3447 spin_lock_init(&mdsc->dentry_lru_lock);
3448 INIT_LIST_HEAD(&mdsc->dentry_lru);
3449
3450 ceph_caps_init(mdsc);
3451 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3452
3453 init_rwsem(&mdsc->pool_perm_rwsem);
3454 mdsc->pool_perm_tree = RB_ROOT;
3455
3456 return 0;
3457 }
3458
3459 /*
3460 * Wait for safe replies on open mds requests. If we time out, drop
3461 * all requests from the tree to avoid dangling dentry refs.
3462 */
3463 static void wait_requests(struct ceph_mds_client *mdsc)
3464 {
3465 struct ceph_options *opts = mdsc->fsc->client->options;
3466 struct ceph_mds_request *req;
3467
3468 mutex_lock(&mdsc->mutex);
3469 if (__get_oldest_req(mdsc)) {
3470 mutex_unlock(&mdsc->mutex);
3471
3472 dout("wait_requests waiting for requests\n");
3473 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3474 ceph_timeout_jiffies(opts->mount_timeout));
3475
3476 /* tear down remaining requests */
3477 mutex_lock(&mdsc->mutex);
3478 while ((req = __get_oldest_req(mdsc))) {
3479 dout("wait_requests timed out on tid %llu\n",
3480 req->r_tid);
3481 __unregister_request(mdsc, req);
3482 }
3483 }
3484 mutex_unlock(&mdsc->mutex);
3485 dout("wait_requests done\n");
3486 }
3487
3488 /*
3489 * called before mount is ro, and before dentries are torn down.
3490 * (hmm, does this still race with new lookups?)
3491 */
3492 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3493 {
3494 dout("pre_umount\n");
3495 mdsc->stopping = 1;
3496
3497 drop_leases(mdsc);
3498 ceph_flush_dirty_caps(mdsc);
3499 wait_requests(mdsc);
3500
3501 /*
3502 * wait for reply handlers to drop their request refs and
3503 * their inode/dcache refs
3504 */
3505 ceph_msgr_flush();
3506 }
3507
3508 /*
3509 * wait for all write mds requests to flush.
3510 */
3511 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3512 {
3513 struct ceph_mds_request *req = NULL, *nextreq;
3514 struct rb_node *n;
3515
3516 mutex_lock(&mdsc->mutex);
3517 dout("wait_unsafe_requests want %lld\n", want_tid);
3518 restart:
3519 req = __get_oldest_req(mdsc);
3520 while (req && req->r_tid <= want_tid) {
3521 /* find next request */
3522 n = rb_next(&req->r_node);
3523 if (n)
3524 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3525 else
3526 nextreq = NULL;
3527 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3528 (req->r_op & CEPH_MDS_OP_WRITE)) {
3529 /* write op */
3530 ceph_mdsc_get_request(req);
3531 if (nextreq)
3532 ceph_mdsc_get_request(nextreq);
3533 mutex_unlock(&mdsc->mutex);
3534 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3535 req->r_tid, want_tid);
3536 wait_for_completion(&req->r_safe_completion);
3537 mutex_lock(&mdsc->mutex);
3538 ceph_mdsc_put_request(req);
3539 if (!nextreq)
3540 break; /* next dne before, so we're done! */
3541 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3542 /* next request was removed from tree */
3543 ceph_mdsc_put_request(nextreq);
3544 goto restart;
3545 }
3546 ceph_mdsc_put_request(nextreq); /* won't go away */
3547 }
3548 req = nextreq;
3549 }
3550 mutex_unlock(&mdsc->mutex);
3551 dout("wait_unsafe_requests done\n");
3552 }
3553
3554 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3555 {
3556 u64 want_tid, want_flush;
3557
3558 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3559 return;
3560
3561 dout("sync\n");
3562 mutex_lock(&mdsc->mutex);
3563 want_tid = mdsc->last_tid;
3564 mutex_unlock(&mdsc->mutex);
3565
3566 ceph_flush_dirty_caps(mdsc);
3567 spin_lock(&mdsc->cap_dirty_lock);
3568 want_flush = mdsc->last_cap_flush_tid;
3569 if (!list_empty(&mdsc->cap_flush_list)) {
3570 struct ceph_cap_flush *cf =
3571 list_last_entry(&mdsc->cap_flush_list,
3572 struct ceph_cap_flush, g_list);
3573 cf->wake = true;
3574 }
3575 spin_unlock(&mdsc->cap_dirty_lock);
3576
3577 dout("sync want tid %lld flush_seq %lld\n",
3578 want_tid, want_flush);
3579
3580 wait_unsafe_requests(mdsc, want_tid);
3581 wait_caps_flush(mdsc, want_flush);
3582 }
3583
3584 /*
3585 * true if all sessions are closed, or we force unmount
3586 */
3587 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
3588 {
3589 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3590 return true;
3591 return atomic_read(&mdsc->num_sessions) <= skipped;
3592 }
3593
3594 /*
3595 * called after sb is ro.
3596 */
3597 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3598 {
3599 struct ceph_options *opts = mdsc->fsc->client->options;
3600 struct ceph_mds_session *session;
3601 int i;
3602 int skipped = 0;
3603
3604 dout("close_sessions\n");
3605
3606 /* close sessions */
3607 mutex_lock(&mdsc->mutex);
3608 for (i = 0; i < mdsc->max_sessions; i++) {
3609 session = __ceph_lookup_mds_session(mdsc, i);
3610 if (!session)
3611 continue;
3612 mutex_unlock(&mdsc->mutex);
3613 mutex_lock(&session->s_mutex);
3614 if (__close_session(mdsc, session) <= 0)
3615 skipped++;
3616 mutex_unlock(&session->s_mutex);
3617 ceph_put_mds_session(session);
3618 mutex_lock(&mdsc->mutex);
3619 }
3620 mutex_unlock(&mdsc->mutex);
3621
3622 dout("waiting for sessions to close\n");
3623 wait_event_timeout(mdsc->session_close_wq,
3624 done_closing_sessions(mdsc, skipped),
3625 ceph_timeout_jiffies(opts->mount_timeout));
3626
3627 /* tear down remaining sessions */
3628 mutex_lock(&mdsc->mutex);
3629 for (i = 0; i < mdsc->max_sessions; i++) {
3630 if (mdsc->sessions[i]) {
3631 session = get_session(mdsc->sessions[i]);
3632 __unregister_session(mdsc, session);
3633 mutex_unlock(&mdsc->mutex);
3634 mutex_lock(&session->s_mutex);
3635 remove_session_caps(session);
3636 mutex_unlock(&session->s_mutex);
3637 ceph_put_mds_session(session);
3638 mutex_lock(&mdsc->mutex);
3639 }
3640 }
3641 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3642 mutex_unlock(&mdsc->mutex);
3643
3644 ceph_cleanup_empty_realms(mdsc);
3645
3646 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3647
3648 dout("stopped\n");
3649 }
3650
3651 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3652 {
3653 struct ceph_mds_session *session;
3654 int mds;
3655
3656 dout("force umount\n");
3657
3658 mutex_lock(&mdsc->mutex);
3659 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3660 session = __ceph_lookup_mds_session(mdsc, mds);
3661 if (!session)
3662 continue;
3663 mutex_unlock(&mdsc->mutex);
3664 mutex_lock(&session->s_mutex);
3665 __close_session(mdsc, session);
3666 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3667 cleanup_session_requests(mdsc, session);
3668 remove_session_caps(session);
3669 }
3670 mutex_unlock(&session->s_mutex);
3671 ceph_put_mds_session(session);
3672 mutex_lock(&mdsc->mutex);
3673 kick_requests(mdsc, mds);
3674 }
3675 __wake_requests(mdsc, &mdsc->waiting_for_map);
3676 mutex_unlock(&mdsc->mutex);
3677 }
3678
3679 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3680 {
3681 dout("stop\n");
3682 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3683 if (mdsc->mdsmap)
3684 ceph_mdsmap_destroy(mdsc->mdsmap);
3685 kfree(mdsc->sessions);
3686 ceph_caps_finalize(mdsc);
3687 ceph_pool_perm_destroy(mdsc);
3688 }
3689
3690 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3691 {
3692 struct ceph_mds_client *mdsc = fsc->mdsc;
3693
3694 dout("mdsc_destroy %p\n", mdsc);
3695 ceph_mdsc_stop(mdsc);
3696
3697 /* flush out any connection work with references to us */
3698 ceph_msgr_flush();
3699
3700 fsc->mdsc = NULL;
3701 kfree(mdsc);
3702 dout("mdsc_destroy %p done\n", mdsc);
3703 }
3704
3705 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3706 {
3707 struct ceph_fs_client *fsc = mdsc->fsc;
3708 const char *mds_namespace = fsc->mount_options->mds_namespace;
3709 void *p = msg->front.iov_base;
3710 void *end = p + msg->front.iov_len;
3711 u32 epoch;
3712 u32 map_len;
3713 u32 num_fs;
3714 u32 mount_fscid = (u32)-1;
3715 u8 struct_v, struct_cv;
3716 int err = -EINVAL;
3717
3718 ceph_decode_need(&p, end, sizeof(u32), bad);
3719 epoch = ceph_decode_32(&p);
3720
3721 dout("handle_fsmap epoch %u\n", epoch);
3722
3723 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3724 struct_v = ceph_decode_8(&p);
3725 struct_cv = ceph_decode_8(&p);
3726 map_len = ceph_decode_32(&p);
3727
3728 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
3729 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
3730
3731 num_fs = ceph_decode_32(&p);
3732 while (num_fs-- > 0) {
3733 void *info_p, *info_end;
3734 u32 info_len;
3735 u8 info_v, info_cv;
3736 u32 fscid, namelen;
3737
3738 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3739 info_v = ceph_decode_8(&p);
3740 info_cv = ceph_decode_8(&p);
3741 info_len = ceph_decode_32(&p);
3742 ceph_decode_need(&p, end, info_len, bad);
3743 info_p = p;
3744 info_end = p + info_len;
3745 p = info_end;
3746
3747 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
3748 fscid = ceph_decode_32(&info_p);
3749 namelen = ceph_decode_32(&info_p);
3750 ceph_decode_need(&info_p, info_end, namelen, bad);
3751
3752 if (mds_namespace &&
3753 strlen(mds_namespace) == namelen &&
3754 !strncmp(mds_namespace, (char *)info_p, namelen)) {
3755 mount_fscid = fscid;
3756 break;
3757 }
3758 }
3759
3760 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
3761 if (mount_fscid != (u32)-1) {
3762 fsc->client->monc.fs_cluster_id = mount_fscid;
3763 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
3764 0, true);
3765 ceph_monc_renew_subs(&fsc->client->monc);
3766 } else {
3767 err = -ENOENT;
3768 goto err_out;
3769 }
3770 return;
3771 bad:
3772 pr_err("error decoding fsmap\n");
3773 err_out:
3774 mutex_lock(&mdsc->mutex);
3775 mdsc->mdsmap_err = -ENOENT;
3776 __wake_requests(mdsc, &mdsc->waiting_for_map);
3777 mutex_unlock(&mdsc->mutex);
3778 return;
3779 }
3780
3781 /*
3782 * handle mds map update.
3783 */
3784 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3785 {
3786 u32 epoch;
3787 u32 maplen;
3788 void *p = msg->front.iov_base;
3789 void *end = p + msg->front.iov_len;
3790 struct ceph_mdsmap *newmap, *oldmap;
3791 struct ceph_fsid fsid;
3792 int err = -EINVAL;
3793
3794 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3795 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3796 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3797 return;
3798 epoch = ceph_decode_32(&p);
3799 maplen = ceph_decode_32(&p);
3800 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3801
3802 /* do we need it? */
3803 mutex_lock(&mdsc->mutex);
3804 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3805 dout("handle_map epoch %u <= our %u\n",
3806 epoch, mdsc->mdsmap->m_epoch);
3807 mutex_unlock(&mdsc->mutex);
3808 return;
3809 }
3810
3811 newmap = ceph_mdsmap_decode(&p, end);
3812 if (IS_ERR(newmap)) {
3813 err = PTR_ERR(newmap);
3814 goto bad_unlock;
3815 }
3816
3817 /* swap into place */
3818 if (mdsc->mdsmap) {
3819 oldmap = mdsc->mdsmap;
3820 mdsc->mdsmap = newmap;
3821 check_new_map(mdsc, newmap, oldmap);
3822 ceph_mdsmap_destroy(oldmap);
3823 } else {
3824 mdsc->mdsmap = newmap; /* first mds map */
3825 }
3826 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3827
3828 __wake_requests(mdsc, &mdsc->waiting_for_map);
3829 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
3830 mdsc->mdsmap->m_epoch);
3831
3832 mutex_unlock(&mdsc->mutex);
3833 schedule_delayed(mdsc);
3834 return;
3835
3836 bad_unlock:
3837 mutex_unlock(&mdsc->mutex);
3838 bad:
3839 pr_err("error decoding mdsmap %d\n", err);
3840 return;
3841 }
3842
3843 static struct ceph_connection *con_get(struct ceph_connection *con)
3844 {
3845 struct ceph_mds_session *s = con->private;
3846
3847 if (get_session(s)) {
3848 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3849 return con;
3850 }
3851 dout("mdsc con_get %p FAIL\n", s);
3852 return NULL;
3853 }
3854
3855 static void con_put(struct ceph_connection *con)
3856 {
3857 struct ceph_mds_session *s = con->private;
3858
3859 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
3860 ceph_put_mds_session(s);
3861 }
3862
3863 /*
3864 * if the client is unresponsive for long enough, the mds will kill
3865 * the session entirely.
3866 */
3867 static void peer_reset(struct ceph_connection *con)
3868 {
3869 struct ceph_mds_session *s = con->private;
3870 struct ceph_mds_client *mdsc = s->s_mdsc;
3871
3872 pr_warn("mds%d closed our session\n", s->s_mds);
3873 send_mds_reconnect(mdsc, s);
3874 }
3875
3876 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3877 {
3878 struct ceph_mds_session *s = con->private;
3879 struct ceph_mds_client *mdsc = s->s_mdsc;
3880 int type = le16_to_cpu(msg->hdr.type);
3881
3882 mutex_lock(&mdsc->mutex);
3883 if (__verify_registered_session(mdsc, s) < 0) {
3884 mutex_unlock(&mdsc->mutex);
3885 goto out;
3886 }
3887 mutex_unlock(&mdsc->mutex);
3888
3889 switch (type) {
3890 case CEPH_MSG_MDS_MAP:
3891 ceph_mdsc_handle_mdsmap(mdsc, msg);
3892 break;
3893 case CEPH_MSG_FS_MAP_USER:
3894 ceph_mdsc_handle_fsmap(mdsc, msg);
3895 break;
3896 case CEPH_MSG_CLIENT_SESSION:
3897 handle_session(s, msg);
3898 break;
3899 case CEPH_MSG_CLIENT_REPLY:
3900 handle_reply(s, msg);
3901 break;
3902 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3903 handle_forward(mdsc, s, msg);
3904 break;
3905 case CEPH_MSG_CLIENT_CAPS:
3906 ceph_handle_caps(s, msg);
3907 break;
3908 case CEPH_MSG_CLIENT_SNAP:
3909 ceph_handle_snap(mdsc, s, msg);
3910 break;
3911 case CEPH_MSG_CLIENT_LEASE:
3912 handle_lease(mdsc, s, msg);
3913 break;
3914
3915 default:
3916 pr_err("received unknown message type %d %s\n", type,
3917 ceph_msg_type_name(type));
3918 }
3919 out:
3920 ceph_msg_put(msg);
3921 }
3922
3923 /*
3924 * authentication
3925 */
3926
3927 /*
3928 * Note: returned pointer is the address of a structure that's
3929 * managed separately. Caller must *not* attempt to free it.
3930 */
3931 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
3932 int *proto, int force_new)
3933 {
3934 struct ceph_mds_session *s = con->private;
3935 struct ceph_mds_client *mdsc = s->s_mdsc;
3936 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3937 struct ceph_auth_handshake *auth = &s->s_auth;
3938
3939 if (force_new && auth->authorizer) {
3940 ceph_auth_destroy_authorizer(auth->authorizer);
3941 auth->authorizer = NULL;
3942 }
3943 if (!auth->authorizer) {
3944 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3945 auth);
3946 if (ret)
3947 return ERR_PTR(ret);
3948 } else {
3949 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3950 auth);
3951 if (ret)
3952 return ERR_PTR(ret);
3953 }
3954 *proto = ac->protocol;
3955
3956 return auth;
3957 }
3958
3959
3960 static int verify_authorizer_reply(struct ceph_connection *con)
3961 {
3962 struct ceph_mds_session *s = con->private;
3963 struct ceph_mds_client *mdsc = s->s_mdsc;
3964 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3965
3966 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
3967 }
3968
3969 static int invalidate_authorizer(struct ceph_connection *con)
3970 {
3971 struct ceph_mds_session *s = con->private;
3972 struct ceph_mds_client *mdsc = s->s_mdsc;
3973 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3974
3975 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3976
3977 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
3978 }
3979
3980 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3981 struct ceph_msg_header *hdr, int *skip)
3982 {
3983 struct ceph_msg *msg;
3984 int type = (int) le16_to_cpu(hdr->type);
3985 int front_len = (int) le32_to_cpu(hdr->front_len);
3986
3987 if (con->in_msg)
3988 return con->in_msg;
3989
3990 *skip = 0;
3991 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3992 if (!msg) {
3993 pr_err("unable to allocate msg type %d len %d\n",
3994 type, front_len);
3995 return NULL;
3996 }
3997
3998 return msg;
3999 }
4000
4001 static int mds_sign_message(struct ceph_msg *msg)
4002 {
4003 struct ceph_mds_session *s = msg->con->private;
4004 struct ceph_auth_handshake *auth = &s->s_auth;
4005
4006 return ceph_auth_sign_message(auth, msg);
4007 }
4008
4009 static int mds_check_message_signature(struct ceph_msg *msg)
4010 {
4011 struct ceph_mds_session *s = msg->con->private;
4012 struct ceph_auth_handshake *auth = &s->s_auth;
4013
4014 return ceph_auth_check_message_signature(auth, msg);
4015 }
4016
4017 static const struct ceph_connection_operations mds_con_ops = {
4018 .get = con_get,
4019 .put = con_put,
4020 .dispatch = dispatch,
4021 .get_authorizer = get_authorizer,
4022 .verify_authorizer_reply = verify_authorizer_reply,
4023 .invalidate_authorizer = invalidate_authorizer,
4024 .peer_reset = peer_reset,
4025 .alloc_msg = mds_alloc_msg,
4026 .sign_message = mds_sign_message,
4027 .check_message_signature = mds_check_message_signature,
4028 };
4029
4030 /* eof */
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