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
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48struct ceph_reconnect_state {
49 int nr_caps;
50 struct ceph_pagelist *pagelist;
51 unsigned msg_version;
52};
53
54static void __wake_requests(struct ceph_mds_client *mdsc,
55 struct list_head *head);
56
57static const struct ceph_connection_operations mds_con_ops;
58
59
60
61
62
63
64
65
66
67static 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;
115bad:
116 return err;
117}
118
119
120
121
122
123static 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
160bad:
161 err = -EIO;
162out_bad:
163 pr_err("problem parsing mds trace %d\n", err);
164 return err;
165}
166
167
168
169
170static 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
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
218 err = parse_reply_info_in(p, end, &rde->inode, features);
219 if (err < 0)
220 goto out_bad;
221
222 rde->offset = 0;
223 i++;
224 num--;
225 }
226
227done:
228 if (*p != end)
229 goto bad;
230 return 0;
231
232bad:
233 err = -EIO;
234out_bad:
235 pr_err("problem parsing dir contents %d\n", err);
236 return err;
237}
238
239
240
241
242static 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
256bad:
257 return -EIO;
258}
259
260
261
262
263static 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
280bad:
281 return -EIO;
282}
283
284
285
286
287static int parse_reply_info_extra(void **p, void *end,
288 struct ceph_mds_reply_info_parsed *info,
289 u64 features)
290{
291 u32 op = le32_to_cpu(info->head->op);
292
293 if (op == CEPH_MDS_OP_GETFILELOCK)
294 return parse_reply_info_filelock(p, end, info, features);
295 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
296 return parse_reply_info_dir(p, end, info, features);
297 else if (op == CEPH_MDS_OP_CREATE)
298 return parse_reply_info_create(p, end, info, features);
299 else
300 return -EIO;
301}
302
303
304
305
306static int parse_reply_info(struct ceph_msg *msg,
307 struct ceph_mds_reply_info_parsed *info,
308 u64 features)
309{
310 void *p, *end;
311 u32 len;
312 int err;
313
314 info->head = msg->front.iov_base;
315 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
316 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
317
318
319 ceph_decode_32_safe(&p, end, len, bad);
320 if (len > 0) {
321 ceph_decode_need(&p, end, len, bad);
322 err = parse_reply_info_trace(&p, p+len, info, features);
323 if (err < 0)
324 goto out_bad;
325 }
326
327
328 ceph_decode_32_safe(&p, end, len, bad);
329 if (len > 0) {
330 ceph_decode_need(&p, end, len, bad);
331 err = parse_reply_info_extra(&p, p+len, info, features);
332 if (err < 0)
333 goto out_bad;
334 }
335
336
337 ceph_decode_32_safe(&p, end, len, bad);
338 info->snapblob_len = len;
339 info->snapblob = p;
340 p += len;
341
342 if (p != end)
343 goto bad;
344 return 0;
345
346bad:
347 err = -EIO;
348out_bad:
349 pr_err("mds parse_reply err %d\n", err);
350 return err;
351}
352
353static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
354{
355 if (!info->dir_entries)
356 return;
357 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
358}
359
360
361
362
363
364const char *ceph_session_state_name(int s)
365{
366 switch (s) {
367 case CEPH_MDS_SESSION_NEW: return "new";
368 case CEPH_MDS_SESSION_OPENING: return "opening";
369 case CEPH_MDS_SESSION_OPEN: return "open";
370 case CEPH_MDS_SESSION_HUNG: return "hung";
371 case CEPH_MDS_SESSION_CLOSING: return "closing";
372 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
373 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
374 case CEPH_MDS_SESSION_REJECTED: return "rejected";
375 default: return "???";
376 }
377}
378
379static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
380{
381 if (atomic_inc_not_zero(&s->s_ref)) {
382 dout("mdsc get_session %p %d -> %d\n", s,
383 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
384 return s;
385 } else {
386 dout("mdsc get_session %p 0 -- FAIL", s);
387 return NULL;
388 }
389}
390
391void ceph_put_mds_session(struct ceph_mds_session *s)
392{
393 dout("mdsc put_session %p %d -> %d\n", s,
394 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
395 if (atomic_dec_and_test(&s->s_ref)) {
396 if (s->s_auth.authorizer)
397 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
398 kfree(s);
399 }
400}
401
402
403
404
405struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
406 int mds)
407{
408 struct ceph_mds_session *session;
409
410 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
411 return NULL;
412 session = mdsc->sessions[mds];
413 dout("lookup_mds_session %p %d\n", session,
414 atomic_read(&session->s_ref));
415 get_session(session);
416 return session;
417}
418
419static bool __have_session(struct ceph_mds_client *mdsc, int mds)
420{
421 if (mds >= mdsc->max_sessions)
422 return false;
423 return mdsc->sessions[mds];
424}
425
426static int __verify_registered_session(struct ceph_mds_client *mdsc,
427 struct ceph_mds_session *s)
428{
429 if (s->s_mds >= mdsc->max_sessions ||
430 mdsc->sessions[s->s_mds] != s)
431 return -ENOENT;
432 return 0;
433}
434
435
436
437
438
439static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
440 int mds)
441{
442 struct ceph_mds_session *s;
443
444 if (mds >= mdsc->mdsmap->m_max_mds)
445 return ERR_PTR(-EINVAL);
446
447 s = kzalloc(sizeof(*s), GFP_NOFS);
448 if (!s)
449 return ERR_PTR(-ENOMEM);
450 s->s_mdsc = mdsc;
451 s->s_mds = mds;
452 s->s_state = CEPH_MDS_SESSION_NEW;
453 s->s_ttl = 0;
454 s->s_seq = 0;
455 mutex_init(&s->s_mutex);
456
457 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
458
459 spin_lock_init(&s->s_gen_ttl_lock);
460 s->s_cap_gen = 0;
461 s->s_cap_ttl = jiffies - 1;
462
463 spin_lock_init(&s->s_cap_lock);
464 s->s_renew_requested = 0;
465 s->s_renew_seq = 0;
466 INIT_LIST_HEAD(&s->s_caps);
467 s->s_nr_caps = 0;
468 s->s_trim_caps = 0;
469 atomic_set(&s->s_ref, 1);
470 INIT_LIST_HEAD(&s->s_waiting);
471 INIT_LIST_HEAD(&s->s_unsafe);
472 s->s_num_cap_releases = 0;
473 s->s_cap_reconnect = 0;
474 s->s_cap_iterator = NULL;
475 INIT_LIST_HEAD(&s->s_cap_releases);
476 INIT_LIST_HEAD(&s->s_cap_flushing);
477
478 dout("register_session mds%d\n", mds);
479 if (mds >= mdsc->max_sessions) {
480 int newmax = 1 << get_count_order(mds+1);
481 struct ceph_mds_session **sa;
482
483 dout("register_session realloc to %d\n", newmax);
484 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
485 if (sa == NULL)
486 goto fail_realloc;
487 if (mdsc->sessions) {
488 memcpy(sa, mdsc->sessions,
489 mdsc->max_sessions * sizeof(void *));
490 kfree(mdsc->sessions);
491 }
492 mdsc->sessions = sa;
493 mdsc->max_sessions = newmax;
494 }
495 mdsc->sessions[mds] = s;
496 atomic_inc(&mdsc->num_sessions);
497 atomic_inc(&s->s_ref);
498
499 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
500 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
501
502 return s;
503
504fail_realloc:
505 kfree(s);
506 return ERR_PTR(-ENOMEM);
507}
508
509
510
511
512static void __unregister_session(struct ceph_mds_client *mdsc,
513 struct ceph_mds_session *s)
514{
515 dout("__unregister_session mds%d %p\n", s->s_mds, s);
516 BUG_ON(mdsc->sessions[s->s_mds] != s);
517 mdsc->sessions[s->s_mds] = NULL;
518 ceph_con_close(&s->s_con);
519 ceph_put_mds_session(s);
520 atomic_dec(&mdsc->num_sessions);
521}
522
523
524
525
526
527
528static void put_request_session(struct ceph_mds_request *req)
529{
530 if (req->r_session) {
531 ceph_put_mds_session(req->r_session);
532 req->r_session = NULL;
533 }
534}
535
536void ceph_mdsc_release_request(struct kref *kref)
537{
538 struct ceph_mds_request *req = container_of(kref,
539 struct ceph_mds_request,
540 r_kref);
541 destroy_reply_info(&req->r_reply_info);
542 if (req->r_request)
543 ceph_msg_put(req->r_request);
544 if (req->r_reply)
545 ceph_msg_put(req->r_reply);
546 if (req->r_inode) {
547 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
548 iput(req->r_inode);
549 }
550 if (req->r_locked_dir)
551 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
552 iput(req->r_target_inode);
553 if (req->r_dentry)
554 dput(req->r_dentry);
555 if (req->r_old_dentry)
556 dput(req->r_old_dentry);
557 if (req->r_old_dentry_dir) {
558
559
560
561
562
563
564 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
565 CEPH_CAP_PIN);
566 iput(req->r_old_dentry_dir);
567 }
568 kfree(req->r_path1);
569 kfree(req->r_path2);
570 if (req->r_pagelist)
571 ceph_pagelist_release(req->r_pagelist);
572 put_request_session(req);
573 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
574 kfree(req);
575}
576
577DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
578
579
580
581
582
583
584static struct ceph_mds_request *
585lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
586{
587 struct ceph_mds_request *req;
588
589 req = lookup_request(&mdsc->request_tree, tid);
590 if (req)
591 ceph_mdsc_get_request(req);
592
593 return req;
594}
595
596
597
598
599
600
601
602static void __register_request(struct ceph_mds_client *mdsc,
603 struct ceph_mds_request *req,
604 struct inode *dir)
605{
606 req->r_tid = ++mdsc->last_tid;
607 if (req->r_num_caps)
608 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
609 req->r_num_caps);
610 dout("__register_request %p tid %lld\n", req, req->r_tid);
611 ceph_mdsc_get_request(req);
612 insert_request(&mdsc->request_tree, req);
613
614 req->r_uid = current_fsuid();
615 req->r_gid = current_fsgid();
616
617 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
618 mdsc->oldest_tid = req->r_tid;
619
620 if (dir) {
621 ihold(dir);
622 req->r_unsafe_dir = dir;
623 }
624}
625
626static void __unregister_request(struct ceph_mds_client *mdsc,
627 struct ceph_mds_request *req)
628{
629 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
630
631 if (req->r_tid == mdsc->oldest_tid) {
632 struct rb_node *p = rb_next(&req->r_node);
633 mdsc->oldest_tid = 0;
634 while (p) {
635 struct ceph_mds_request *next_req =
636 rb_entry(p, struct ceph_mds_request, r_node);
637 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
638 mdsc->oldest_tid = next_req->r_tid;
639 break;
640 }
641 p = rb_next(p);
642 }
643 }
644
645 erase_request(&mdsc->request_tree, req);
646
647 if (req->r_unsafe_dir && req->r_got_unsafe) {
648 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
649 spin_lock(&ci->i_unsafe_lock);
650 list_del_init(&req->r_unsafe_dir_item);
651 spin_unlock(&ci->i_unsafe_lock);
652 }
653 if (req->r_target_inode && req->r_got_unsafe) {
654 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
655 spin_lock(&ci->i_unsafe_lock);
656 list_del_init(&req->r_unsafe_target_item);
657 spin_unlock(&ci->i_unsafe_lock);
658 }
659
660 if (req->r_unsafe_dir) {
661 iput(req->r_unsafe_dir);
662 req->r_unsafe_dir = NULL;
663 }
664
665 complete_all(&req->r_safe_completion);
666
667 ceph_mdsc_put_request(req);
668}
669
670
671
672
673
674
675
676
677
678static struct dentry *get_nonsnap_parent(struct dentry *dentry)
679{
680
681
682
683
684
685
686 while (!IS_ROOT(dentry) && ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
687 dentry = dentry->d_parent;
688 return dentry;
689}
690
691static int __choose_mds(struct ceph_mds_client *mdsc,
692 struct ceph_mds_request *req)
693{
694 struct inode *inode;
695 struct ceph_inode_info *ci;
696 struct ceph_cap *cap;
697 int mode = req->r_direct_mode;
698 int mds = -1;
699 u32 hash = req->r_direct_hash;
700 bool is_hash = req->r_direct_is_hash;
701
702
703
704
705
706 if (req->r_resend_mds >= 0 &&
707 (__have_session(mdsc, req->r_resend_mds) ||
708 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
709 dout("choose_mds using resend_mds mds%d\n",
710 req->r_resend_mds);
711 return req->r_resend_mds;
712 }
713
714 if (mode == USE_RANDOM_MDS)
715 goto random;
716
717 inode = NULL;
718 if (req->r_inode) {
719 inode = req->r_inode;
720 } else if (req->r_dentry) {
721
722 struct dentry *parent = req->r_dentry->d_parent;
723 struct inode *dir = d_inode(parent);
724
725 if (dir->i_sb != mdsc->fsc->sb) {
726
727 inode = d_inode(req->r_dentry);
728 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
729
730
731 struct dentry *dn = get_nonsnap_parent(parent);
732 inode = d_inode(dn);
733 dout("__choose_mds using nonsnap parent %p\n", inode);
734 } else {
735
736 inode = d_inode(req->r_dentry);
737 if (!inode || mode == USE_AUTH_MDS) {
738
739 inode = dir;
740 hash = ceph_dentry_hash(dir, req->r_dentry);
741 is_hash = true;
742 }
743 }
744 }
745
746 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
747 (int)hash, mode);
748 if (!inode)
749 goto random;
750 ci = ceph_inode(inode);
751
752 if (is_hash && S_ISDIR(inode->i_mode)) {
753 struct ceph_inode_frag frag;
754 int found;
755
756 ceph_choose_frag(ci, hash, &frag, &found);
757 if (found) {
758 if (mode == USE_ANY_MDS && frag.ndist > 0) {
759 u8 r;
760
761
762 get_random_bytes(&r, 1);
763 r %= frag.ndist;
764 mds = frag.dist[r];
765 dout("choose_mds %p %llx.%llx "
766 "frag %u mds%d (%d/%d)\n",
767 inode, ceph_vinop(inode),
768 frag.frag, mds,
769 (int)r, frag.ndist);
770 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
771 CEPH_MDS_STATE_ACTIVE)
772 return mds;
773 }
774
775
776
777
778 mode = USE_AUTH_MDS;
779 if (frag.mds >= 0) {
780
781 mds = frag.mds;
782 dout("choose_mds %p %llx.%llx "
783 "frag %u mds%d (auth)\n",
784 inode, ceph_vinop(inode), frag.frag, mds);
785 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
786 CEPH_MDS_STATE_ACTIVE)
787 return mds;
788 }
789 }
790 }
791
792 spin_lock(&ci->i_ceph_lock);
793 cap = NULL;
794 if (mode == USE_AUTH_MDS)
795 cap = ci->i_auth_cap;
796 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
797 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
798 if (!cap) {
799 spin_unlock(&ci->i_ceph_lock);
800 goto random;
801 }
802 mds = cap->session->s_mds;
803 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
804 inode, ceph_vinop(inode), mds,
805 cap == ci->i_auth_cap ? "auth " : "", cap);
806 spin_unlock(&ci->i_ceph_lock);
807 return mds;
808
809random:
810 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
811 dout("choose_mds chose random mds%d\n", mds);
812 return mds;
813}
814
815
816
817
818
819static struct ceph_msg *create_session_msg(u32 op, u64 seq)
820{
821 struct ceph_msg *msg;
822 struct ceph_mds_session_head *h;
823
824 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
825 false);
826 if (!msg) {
827 pr_err("create_session_msg ENOMEM creating msg\n");
828 return NULL;
829 }
830 h = msg->front.iov_base;
831 h->op = cpu_to_le32(op);
832 h->seq = cpu_to_le64(seq);
833
834 return msg;
835}
836
837
838
839
840
841static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
842{
843 struct ceph_msg *msg;
844 struct ceph_mds_session_head *h;
845 int i = -1;
846 int metadata_bytes = 0;
847 int metadata_key_count = 0;
848 struct ceph_options *opt = mdsc->fsc->client->options;
849 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
850 void *p;
851
852 const char* metadata[][2] = {
853 {"hostname", utsname()->nodename},
854 {"kernel_version", utsname()->release},
855 {"entity_id", opt->name ? : ""},
856 {"root", fsopt->server_path ? : "/"},
857 {NULL, NULL}
858 };
859
860
861 metadata_bytes = 4;
862 for (i = 0; metadata[i][0] != NULL; ++i) {
863 metadata_bytes += 8 + strlen(metadata[i][0]) +
864 strlen(metadata[i][1]);
865 metadata_key_count++;
866 }
867
868
869 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
870 GFP_NOFS, false);
871 if (!msg) {
872 pr_err("create_session_msg ENOMEM creating msg\n");
873 return NULL;
874 }
875 h = msg->front.iov_base;
876 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
877 h->seq = cpu_to_le64(seq);
878
879
880
881
882
883
884
885 msg->hdr.version = cpu_to_le16(2);
886 msg->hdr.compat_version = cpu_to_le16(1);
887
888
889 p = msg->front.iov_base + sizeof(*h);
890
891
892 ceph_encode_32(&p, metadata_key_count);
893
894
895 for (i = 0; metadata[i][0] != NULL; ++i) {
896 size_t const key_len = strlen(metadata[i][0]);
897 size_t const val_len = strlen(metadata[i][1]);
898
899 ceph_encode_32(&p, key_len);
900 memcpy(p, metadata[i][0], key_len);
901 p += key_len;
902 ceph_encode_32(&p, val_len);
903 memcpy(p, metadata[i][1], val_len);
904 p += val_len;
905 }
906
907 return msg;
908}
909
910
911
912
913
914
915static int __open_session(struct ceph_mds_client *mdsc,
916 struct ceph_mds_session *session)
917{
918 struct ceph_msg *msg;
919 int mstate;
920 int mds = session->s_mds;
921
922
923 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
924 dout("open_session to mds%d (%s)\n", mds,
925 ceph_mds_state_name(mstate));
926 session->s_state = CEPH_MDS_SESSION_OPENING;
927 session->s_renew_requested = jiffies;
928
929
930 msg = create_session_open_msg(mdsc, session->s_seq);
931 if (!msg)
932 return -ENOMEM;
933 ceph_con_send(&session->s_con, msg);
934 return 0;
935}
936
937
938
939
940
941
942static struct ceph_mds_session *
943__open_export_target_session(struct ceph_mds_client *mdsc, int target)
944{
945 struct ceph_mds_session *session;
946
947 session = __ceph_lookup_mds_session(mdsc, target);
948 if (!session) {
949 session = register_session(mdsc, target);
950 if (IS_ERR(session))
951 return session;
952 }
953 if (session->s_state == CEPH_MDS_SESSION_NEW ||
954 session->s_state == CEPH_MDS_SESSION_CLOSING)
955 __open_session(mdsc, session);
956
957 return session;
958}
959
960struct ceph_mds_session *
961ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
962{
963 struct ceph_mds_session *session;
964
965 dout("open_export_target_session to mds%d\n", target);
966
967 mutex_lock(&mdsc->mutex);
968 session = __open_export_target_session(mdsc, target);
969 mutex_unlock(&mdsc->mutex);
970
971 return session;
972}
973
974static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
975 struct ceph_mds_session *session)
976{
977 struct ceph_mds_info *mi;
978 struct ceph_mds_session *ts;
979 int i, mds = session->s_mds;
980
981 if (mds >= mdsc->mdsmap->m_max_mds)
982 return;
983
984 mi = &mdsc->mdsmap->m_info[mds];
985 dout("open_export_target_sessions for mds%d (%d targets)\n",
986 session->s_mds, mi->num_export_targets);
987
988 for (i = 0; i < mi->num_export_targets; i++) {
989 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
990 if (!IS_ERR(ts))
991 ceph_put_mds_session(ts);
992 }
993}
994
995void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
996 struct ceph_mds_session *session)
997{
998 mutex_lock(&mdsc->mutex);
999 __open_export_target_sessions(mdsc, session);
1000 mutex_unlock(&mdsc->mutex);
1001}
1002
1003
1004
1005
1006
1007
1008static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
1009 struct ceph_mds_session *session)
1010 __releases(session->s_cap_lock)
1011{
1012 LIST_HEAD(tmp_list);
1013 list_splice_init(&session->s_cap_releases, &tmp_list);
1014 session->s_num_cap_releases = 0;
1015 spin_unlock(&session->s_cap_lock);
1016
1017 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1018 while (!list_empty(&tmp_list)) {
1019 struct ceph_cap *cap;
1020
1021 cap = list_first_entry(&tmp_list,
1022 struct ceph_cap, session_caps);
1023 list_del(&cap->session_caps);
1024 ceph_put_cap(mdsc, cap);
1025 }
1026}
1027
1028static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1029 struct ceph_mds_session *session)
1030{
1031 struct ceph_mds_request *req;
1032 struct rb_node *p;
1033
1034 dout("cleanup_session_requests mds%d\n", session->s_mds);
1035 mutex_lock(&mdsc->mutex);
1036 while (!list_empty(&session->s_unsafe)) {
1037 req = list_first_entry(&session->s_unsafe,
1038 struct ceph_mds_request, r_unsafe_item);
1039 list_del_init(&req->r_unsafe_item);
1040 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1041 req->r_tid);
1042 __unregister_request(mdsc, req);
1043 }
1044
1045 p = rb_first(&mdsc->request_tree);
1046 while (p) {
1047 req = rb_entry(p, struct ceph_mds_request, r_node);
1048 p = rb_next(p);
1049 if (req->r_session &&
1050 req->r_session->s_mds == session->s_mds)
1051 req->r_attempts = 0;
1052 }
1053 mutex_unlock(&mdsc->mutex);
1054}
1055
1056
1057
1058
1059
1060
1061
1062static int iterate_session_caps(struct ceph_mds_session *session,
1063 int (*cb)(struct inode *, struct ceph_cap *,
1064 void *), void *arg)
1065{
1066 struct list_head *p;
1067 struct ceph_cap *cap;
1068 struct inode *inode, *last_inode = NULL;
1069 struct ceph_cap *old_cap = NULL;
1070 int ret;
1071
1072 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1073 spin_lock(&session->s_cap_lock);
1074 p = session->s_caps.next;
1075 while (p != &session->s_caps) {
1076 cap = list_entry(p, struct ceph_cap, session_caps);
1077 inode = igrab(&cap->ci->vfs_inode);
1078 if (!inode) {
1079 p = p->next;
1080 continue;
1081 }
1082 session->s_cap_iterator = cap;
1083 spin_unlock(&session->s_cap_lock);
1084
1085 if (last_inode) {
1086 iput(last_inode);
1087 last_inode = NULL;
1088 }
1089 if (old_cap) {
1090 ceph_put_cap(session->s_mdsc, old_cap);
1091 old_cap = NULL;
1092 }
1093
1094 ret = cb(inode, cap, arg);
1095 last_inode = inode;
1096
1097 spin_lock(&session->s_cap_lock);
1098 p = p->next;
1099 if (cap->ci == NULL) {
1100 dout("iterate_session_caps finishing cap %p removal\n",
1101 cap);
1102 BUG_ON(cap->session != session);
1103 cap->session = NULL;
1104 list_del_init(&cap->session_caps);
1105 session->s_nr_caps--;
1106 if (cap->queue_release) {
1107 list_add_tail(&cap->session_caps,
1108 &session->s_cap_releases);
1109 session->s_num_cap_releases++;
1110 } else {
1111 old_cap = cap;
1112 }
1113 }
1114 if (ret < 0)
1115 goto out;
1116 }
1117 ret = 0;
1118out:
1119 session->s_cap_iterator = NULL;
1120 spin_unlock(&session->s_cap_lock);
1121
1122 iput(last_inode);
1123 if (old_cap)
1124 ceph_put_cap(session->s_mdsc, old_cap);
1125
1126 return ret;
1127}
1128
1129static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1130 void *arg)
1131{
1132 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
1133 struct ceph_inode_info *ci = ceph_inode(inode);
1134 LIST_HEAD(to_remove);
1135 bool drop = false;
1136 bool invalidate = false;
1137
1138 dout("removing cap %p, ci is %p, inode is %p\n",
1139 cap, ci, &ci->vfs_inode);
1140 spin_lock(&ci->i_ceph_lock);
1141 __ceph_remove_cap(cap, false);
1142 if (!ci->i_auth_cap) {
1143 struct ceph_cap_flush *cf;
1144 struct ceph_mds_client *mdsc = fsc->mdsc;
1145
1146 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1147
1148 if (ci->i_wrbuffer_ref > 0 &&
1149 ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
1150 invalidate = true;
1151
1152 while (!list_empty(&ci->i_cap_flush_list)) {
1153 cf = list_first_entry(&ci->i_cap_flush_list,
1154 struct ceph_cap_flush, i_list);
1155 list_move(&cf->i_list, &to_remove);
1156 }
1157
1158 spin_lock(&mdsc->cap_dirty_lock);
1159
1160 list_for_each_entry(cf, &to_remove, i_list)
1161 list_del(&cf->g_list);
1162
1163 if (!list_empty(&ci->i_dirty_item)) {
1164 pr_warn_ratelimited(
1165 " dropping dirty %s state for %p %lld\n",
1166 ceph_cap_string(ci->i_dirty_caps),
1167 inode, ceph_ino(inode));
1168 ci->i_dirty_caps = 0;
1169 list_del_init(&ci->i_dirty_item);
1170 drop = true;
1171 }
1172 if (!list_empty(&ci->i_flushing_item)) {
1173 pr_warn_ratelimited(
1174 " dropping dirty+flushing %s state for %p %lld\n",
1175 ceph_cap_string(ci->i_flushing_caps),
1176 inode, ceph_ino(inode));
1177 ci->i_flushing_caps = 0;
1178 list_del_init(&ci->i_flushing_item);
1179 mdsc->num_cap_flushing--;
1180 drop = true;
1181 }
1182 spin_unlock(&mdsc->cap_dirty_lock);
1183
1184 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1185 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
1186 ci->i_prealloc_cap_flush = NULL;
1187 }
1188 }
1189 spin_unlock(&ci->i_ceph_lock);
1190 while (!list_empty(&to_remove)) {
1191 struct ceph_cap_flush *cf;
1192 cf = list_first_entry(&to_remove,
1193 struct ceph_cap_flush, i_list);
1194 list_del(&cf->i_list);
1195 ceph_free_cap_flush(cf);
1196 }
1197
1198 wake_up_all(&ci->i_cap_wq);
1199 if (invalidate)
1200 ceph_queue_invalidate(inode);
1201 if (drop)
1202 iput(inode);
1203 return 0;
1204}
1205
1206
1207
1208
1209static void remove_session_caps(struct ceph_mds_session *session)
1210{
1211 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1212 struct super_block *sb = fsc->sb;
1213 dout("remove_session_caps on %p\n", session);
1214 iterate_session_caps(session, remove_session_caps_cb, fsc);
1215
1216 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1217
1218 spin_lock(&session->s_cap_lock);
1219 if (session->s_nr_caps > 0) {
1220 struct inode *inode;
1221 struct ceph_cap *cap, *prev = NULL;
1222 struct ceph_vino vino;
1223
1224
1225
1226
1227
1228
1229
1230 while (!list_empty(&session->s_caps)) {
1231 cap = list_entry(session->s_caps.next,
1232 struct ceph_cap, session_caps);
1233 if (cap == prev)
1234 break;
1235 prev = cap;
1236 vino = cap->ci->i_vino;
1237 spin_unlock(&session->s_cap_lock);
1238
1239 inode = ceph_find_inode(sb, vino);
1240 iput(inode);
1241
1242 spin_lock(&session->s_cap_lock);
1243 }
1244 }
1245
1246
1247 cleanup_cap_releases(session->s_mdsc, session);
1248
1249 BUG_ON(session->s_nr_caps > 0);
1250 BUG_ON(!list_empty(&session->s_cap_flushing));
1251}
1252
1253
1254
1255
1256
1257
1258
1259static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1260 void *arg)
1261{
1262 struct ceph_inode_info *ci = ceph_inode(inode);
1263
1264 if (arg) {
1265 spin_lock(&ci->i_ceph_lock);
1266 ci->i_wanted_max_size = 0;
1267 ci->i_requested_max_size = 0;
1268 spin_unlock(&ci->i_ceph_lock);
1269 }
1270 wake_up_all(&ci->i_cap_wq);
1271 return 0;
1272}
1273
1274static void wake_up_session_caps(struct ceph_mds_session *session,
1275 int reconnect)
1276{
1277 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1278 iterate_session_caps(session, wake_up_session_cb,
1279 (void *)(unsigned long)reconnect);
1280}
1281
1282
1283
1284
1285
1286
1287
1288static int send_renew_caps(struct ceph_mds_client *mdsc,
1289 struct ceph_mds_session *session)
1290{
1291 struct ceph_msg *msg;
1292 int state;
1293
1294 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1295 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1296 pr_info("mds%d caps stale\n", session->s_mds);
1297 session->s_renew_requested = jiffies;
1298
1299
1300
1301 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1302 if (state < CEPH_MDS_STATE_RECONNECT) {
1303 dout("send_renew_caps ignoring mds%d (%s)\n",
1304 session->s_mds, ceph_mds_state_name(state));
1305 return 0;
1306 }
1307
1308 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1309 ceph_mds_state_name(state));
1310 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1311 ++session->s_renew_seq);
1312 if (!msg)
1313 return -ENOMEM;
1314 ceph_con_send(&session->s_con, msg);
1315 return 0;
1316}
1317
1318static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1319 struct ceph_mds_session *session, u64 seq)
1320{
1321 struct ceph_msg *msg;
1322
1323 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1324 session->s_mds, ceph_session_state_name(session->s_state), seq);
1325 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1326 if (!msg)
1327 return -ENOMEM;
1328 ceph_con_send(&session->s_con, msg);
1329 return 0;
1330}
1331
1332
1333
1334
1335
1336
1337
1338static void renewed_caps(struct ceph_mds_client *mdsc,
1339 struct ceph_mds_session *session, int is_renew)
1340{
1341 int was_stale;
1342 int wake = 0;
1343
1344 spin_lock(&session->s_cap_lock);
1345 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1346
1347 session->s_cap_ttl = session->s_renew_requested +
1348 mdsc->mdsmap->m_session_timeout*HZ;
1349
1350 if (was_stale) {
1351 if (time_before(jiffies, session->s_cap_ttl)) {
1352 pr_info("mds%d caps renewed\n", session->s_mds);
1353 wake = 1;
1354 } else {
1355 pr_info("mds%d caps still stale\n", session->s_mds);
1356 }
1357 }
1358 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1359 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1360 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1361 spin_unlock(&session->s_cap_lock);
1362
1363 if (wake)
1364 wake_up_session_caps(session, 0);
1365}
1366
1367
1368
1369
1370static int request_close_session(struct ceph_mds_client *mdsc,
1371 struct ceph_mds_session *session)
1372{
1373 struct ceph_msg *msg;
1374
1375 dout("request_close_session mds%d state %s seq %lld\n",
1376 session->s_mds, ceph_session_state_name(session->s_state),
1377 session->s_seq);
1378 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1379 if (!msg)
1380 return -ENOMEM;
1381 ceph_con_send(&session->s_con, msg);
1382 return 1;
1383}
1384
1385
1386
1387
1388static int __close_session(struct ceph_mds_client *mdsc,
1389 struct ceph_mds_session *session)
1390{
1391 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1392 return 0;
1393 session->s_state = CEPH_MDS_SESSION_CLOSING;
1394 return request_close_session(mdsc, session);
1395}
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1408{
1409 struct ceph_mds_session *session = arg;
1410 struct ceph_inode_info *ci = ceph_inode(inode);
1411 int used, wanted, oissued, mine;
1412
1413 if (session->s_trim_caps <= 0)
1414 return -1;
1415
1416 spin_lock(&ci->i_ceph_lock);
1417 mine = cap->issued | cap->implemented;
1418 used = __ceph_caps_used(ci);
1419 wanted = __ceph_caps_file_wanted(ci);
1420 oissued = __ceph_caps_issued_other(ci, cap);
1421
1422 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1423 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1424 ceph_cap_string(used), ceph_cap_string(wanted));
1425 if (cap == ci->i_auth_cap) {
1426 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1427 !list_empty(&ci->i_cap_snaps))
1428 goto out;
1429 if ((used | wanted) & CEPH_CAP_ANY_WR)
1430 goto out;
1431 }
1432
1433
1434 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1435 !(oissued & CEPH_CAP_FILE_CACHE)) {
1436 used = 0;
1437 oissued = 0;
1438 }
1439 if ((used | wanted) & ~oissued & mine)
1440 goto out;
1441
1442 session->s_trim_caps--;
1443 if (oissued) {
1444
1445 __ceph_remove_cap(cap, true);
1446 } else {
1447
1448 spin_unlock(&ci->i_ceph_lock);
1449 d_prune_aliases(inode);
1450 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1451 inode, cap, atomic_read(&inode->i_count));
1452 return 0;
1453 }
1454
1455out:
1456 spin_unlock(&ci->i_ceph_lock);
1457 return 0;
1458}
1459
1460
1461
1462
1463static int trim_caps(struct ceph_mds_client *mdsc,
1464 struct ceph_mds_session *session,
1465 int max_caps)
1466{
1467 int trim_caps = session->s_nr_caps - max_caps;
1468
1469 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1470 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1471 if (trim_caps > 0) {
1472 session->s_trim_caps = trim_caps;
1473 iterate_session_caps(session, trim_caps_cb, session);
1474 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1475 session->s_mds, session->s_nr_caps, max_caps,
1476 trim_caps - session->s_trim_caps);
1477 session->s_trim_caps = 0;
1478 }
1479
1480 ceph_send_cap_releases(mdsc, session);
1481 return 0;
1482}
1483
1484static int check_caps_flush(struct ceph_mds_client *mdsc,
1485 u64 want_flush_tid)
1486{
1487 int ret = 1;
1488
1489 spin_lock(&mdsc->cap_dirty_lock);
1490 if (!list_empty(&mdsc->cap_flush_list)) {
1491 struct ceph_cap_flush *cf =
1492 list_first_entry(&mdsc->cap_flush_list,
1493 struct ceph_cap_flush, g_list);
1494 if (cf->tid <= want_flush_tid) {
1495 dout("check_caps_flush still flushing tid "
1496 "%llu <= %llu\n", cf->tid, want_flush_tid);
1497 ret = 0;
1498 }
1499 }
1500 spin_unlock(&mdsc->cap_dirty_lock);
1501 return ret;
1502}
1503
1504
1505
1506
1507
1508
1509static void wait_caps_flush(struct ceph_mds_client *mdsc,
1510 u64 want_flush_tid)
1511{
1512 dout("check_caps_flush want %llu\n", want_flush_tid);
1513
1514 wait_event(mdsc->cap_flushing_wq,
1515 check_caps_flush(mdsc, want_flush_tid));
1516
1517 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
1518}
1519
1520
1521
1522
1523void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1524 struct ceph_mds_session *session)
1525{
1526 struct ceph_msg *msg = NULL;
1527 struct ceph_mds_cap_release *head;
1528 struct ceph_mds_cap_item *item;
1529 struct ceph_cap *cap;
1530 LIST_HEAD(tmp_list);
1531 int num_cap_releases;
1532
1533 spin_lock(&session->s_cap_lock);
1534again:
1535 list_splice_init(&session->s_cap_releases, &tmp_list);
1536 num_cap_releases = session->s_num_cap_releases;
1537 session->s_num_cap_releases = 0;
1538 spin_unlock(&session->s_cap_lock);
1539
1540 while (!list_empty(&tmp_list)) {
1541 if (!msg) {
1542 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1543 PAGE_SIZE, GFP_NOFS, false);
1544 if (!msg)
1545 goto out_err;
1546 head = msg->front.iov_base;
1547 head->num = cpu_to_le32(0);
1548 msg->front.iov_len = sizeof(*head);
1549 }
1550 cap = list_first_entry(&tmp_list, struct ceph_cap,
1551 session_caps);
1552 list_del(&cap->session_caps);
1553 num_cap_releases--;
1554
1555 head = msg->front.iov_base;
1556 le32_add_cpu(&head->num, 1);
1557 item = msg->front.iov_base + msg->front.iov_len;
1558 item->ino = cpu_to_le64(cap->cap_ino);
1559 item->cap_id = cpu_to_le64(cap->cap_id);
1560 item->migrate_seq = cpu_to_le32(cap->mseq);
1561 item->seq = cpu_to_le32(cap->issue_seq);
1562 msg->front.iov_len += sizeof(*item);
1563
1564 ceph_put_cap(mdsc, cap);
1565
1566 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1567 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1568 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1569 ceph_con_send(&session->s_con, msg);
1570 msg = NULL;
1571 }
1572 }
1573
1574 BUG_ON(num_cap_releases != 0);
1575
1576 spin_lock(&session->s_cap_lock);
1577 if (!list_empty(&session->s_cap_releases))
1578 goto again;
1579 spin_unlock(&session->s_cap_lock);
1580
1581 if (msg) {
1582 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1583 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1584 ceph_con_send(&session->s_con, msg);
1585 }
1586 return;
1587out_err:
1588 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1589 session->s_mds);
1590 spin_lock(&session->s_cap_lock);
1591 list_splice(&tmp_list, &session->s_cap_releases);
1592 session->s_num_cap_releases += num_cap_releases;
1593 spin_unlock(&session->s_cap_lock);
1594}
1595
1596
1597
1598
1599
1600int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1601 struct inode *dir)
1602{
1603 struct ceph_inode_info *ci = ceph_inode(dir);
1604 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1605 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1606 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
1607 int order, num_entries;
1608
1609 spin_lock(&ci->i_ceph_lock);
1610 num_entries = ci->i_files + ci->i_subdirs;
1611 spin_unlock(&ci->i_ceph_lock);
1612 num_entries = max(num_entries, 1);
1613 num_entries = min(num_entries, opt->max_readdir);
1614
1615 order = get_order(size * num_entries);
1616 while (order >= 0) {
1617 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
1618 __GFP_NOWARN,
1619 order);
1620 if (rinfo->dir_entries)
1621 break;
1622 order--;
1623 }
1624 if (!rinfo->dir_entries)
1625 return -ENOMEM;
1626
1627 num_entries = (PAGE_SIZE << order) / size;
1628 num_entries = min(num_entries, opt->max_readdir);
1629
1630 rinfo->dir_buf_size = PAGE_SIZE << order;
1631 req->r_num_caps = num_entries + 1;
1632 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1633 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1634 return 0;
1635}
1636
1637
1638
1639
1640struct ceph_mds_request *
1641ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1642{
1643 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1644
1645 if (!req)
1646 return ERR_PTR(-ENOMEM);
1647
1648 mutex_init(&req->r_fill_mutex);
1649 req->r_mdsc = mdsc;
1650 req->r_started = jiffies;
1651 req->r_resend_mds = -1;
1652 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1653 INIT_LIST_HEAD(&req->r_unsafe_target_item);
1654 req->r_fmode = -1;
1655 kref_init(&req->r_kref);
1656 RB_CLEAR_NODE(&req->r_node);
1657 INIT_LIST_HEAD(&req->r_wait);
1658 init_completion(&req->r_completion);
1659 init_completion(&req->r_safe_completion);
1660 INIT_LIST_HEAD(&req->r_unsafe_item);
1661
1662 req->r_stamp = current_fs_time(mdsc->fsc->sb);
1663
1664 req->r_op = op;
1665 req->r_direct_mode = mode;
1666 return req;
1667}
1668
1669
1670
1671
1672
1673
1674static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1675{
1676 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1677 return NULL;
1678 return rb_entry(rb_first(&mdsc->request_tree),
1679 struct ceph_mds_request, r_node);
1680}
1681
1682static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1683{
1684 return mdsc->oldest_tid;
1685}
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1698 int stop_on_nosnap)
1699{
1700 struct dentry *temp;
1701 char *path;
1702 int len, pos;
1703 unsigned seq;
1704
1705 if (dentry == NULL)
1706 return ERR_PTR(-EINVAL);
1707
1708retry:
1709 len = 0;
1710 seq = read_seqbegin(&rename_lock);
1711 rcu_read_lock();
1712 for (temp = dentry; !IS_ROOT(temp);) {
1713 struct inode *inode = d_inode(temp);
1714 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1715 len++;
1716 else if (stop_on_nosnap && inode &&
1717 ceph_snap(inode) == CEPH_NOSNAP)
1718 break;
1719 else
1720 len += 1 + temp->d_name.len;
1721 temp = temp->d_parent;
1722 }
1723 rcu_read_unlock();
1724 if (len)
1725 len--;
1726
1727 path = kmalloc(len+1, GFP_NOFS);
1728 if (path == NULL)
1729 return ERR_PTR(-ENOMEM);
1730 pos = len;
1731 path[pos] = 0;
1732 rcu_read_lock();
1733 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1734 struct inode *inode;
1735
1736 spin_lock(&temp->d_lock);
1737 inode = d_inode(temp);
1738 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1739 dout("build_path path+%d: %p SNAPDIR\n",
1740 pos, temp);
1741 } else if (stop_on_nosnap && inode &&
1742 ceph_snap(inode) == CEPH_NOSNAP) {
1743 spin_unlock(&temp->d_lock);
1744 break;
1745 } else {
1746 pos -= temp->d_name.len;
1747 if (pos < 0) {
1748 spin_unlock(&temp->d_lock);
1749 break;
1750 }
1751 strncpy(path + pos, temp->d_name.name,
1752 temp->d_name.len);
1753 }
1754 spin_unlock(&temp->d_lock);
1755 if (pos)
1756 path[--pos] = '/';
1757 temp = temp->d_parent;
1758 }
1759 rcu_read_unlock();
1760 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1761 pr_err("build_path did not end path lookup where "
1762 "expected, namelen is %d, pos is %d\n", len, pos);
1763
1764
1765
1766
1767 kfree(path);
1768 goto retry;
1769 }
1770
1771 *base = ceph_ino(d_inode(temp));
1772 *plen = len;
1773 dout("build_path on %p %d built %llx '%.*s'\n",
1774 dentry, d_count(dentry), *base, len, path);
1775 return path;
1776}
1777
1778static int build_dentry_path(struct dentry *dentry,
1779 const char **ppath, int *ppathlen, u64 *pino,
1780 int *pfreepath)
1781{
1782 char *path;
1783
1784 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) {
1785 *pino = ceph_ino(d_inode(dentry->d_parent));
1786 *ppath = dentry->d_name.name;
1787 *ppathlen = dentry->d_name.len;
1788 return 0;
1789 }
1790 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1791 if (IS_ERR(path))
1792 return PTR_ERR(path);
1793 *ppath = path;
1794 *pfreepath = 1;
1795 return 0;
1796}
1797
1798static int build_inode_path(struct inode *inode,
1799 const char **ppath, int *ppathlen, u64 *pino,
1800 int *pfreepath)
1801{
1802 struct dentry *dentry;
1803 char *path;
1804
1805 if (ceph_snap(inode) == CEPH_NOSNAP) {
1806 *pino = ceph_ino(inode);
1807 *ppathlen = 0;
1808 return 0;
1809 }
1810 dentry = d_find_alias(inode);
1811 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1812 dput(dentry);
1813 if (IS_ERR(path))
1814 return PTR_ERR(path);
1815 *ppath = path;
1816 *pfreepath = 1;
1817 return 0;
1818}
1819
1820
1821
1822
1823
1824static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1825 const char *rpath, u64 rino,
1826 const char **ppath, int *pathlen,
1827 u64 *ino, int *freepath)
1828{
1829 int r = 0;
1830
1831 if (rinode) {
1832 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1833 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1834 ceph_snap(rinode));
1835 } else if (rdentry) {
1836 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1837 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1838 *ppath);
1839 } else if (rpath || rino) {
1840 *ino = rino;
1841 *ppath = rpath;
1842 *pathlen = rpath ? strlen(rpath) : 0;
1843 dout(" path %.*s\n", *pathlen, rpath);
1844 }
1845
1846 return r;
1847}
1848
1849
1850
1851
1852static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1853 struct ceph_mds_request *req,
1854 int mds, bool drop_cap_releases)
1855{
1856 struct ceph_msg *msg;
1857 struct ceph_mds_request_head *head;
1858 const char *path1 = NULL;
1859 const char *path2 = NULL;
1860 u64 ino1 = 0, ino2 = 0;
1861 int pathlen1 = 0, pathlen2 = 0;
1862 int freepath1 = 0, freepath2 = 0;
1863 int len;
1864 u16 releases;
1865 void *p, *end;
1866 int ret;
1867
1868 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1869 req->r_path1, req->r_ino1.ino,
1870 &path1, &pathlen1, &ino1, &freepath1);
1871 if (ret < 0) {
1872 msg = ERR_PTR(ret);
1873 goto out;
1874 }
1875
1876 ret = set_request_path_attr(NULL, req->r_old_dentry,
1877 req->r_path2, req->r_ino2.ino,
1878 &path2, &pathlen2, &ino2, &freepath2);
1879 if (ret < 0) {
1880 msg = ERR_PTR(ret);
1881 goto out_free1;
1882 }
1883
1884 len = sizeof(*head) +
1885 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
1886 sizeof(struct ceph_timespec);
1887
1888
1889 len += sizeof(struct ceph_mds_request_release) *
1890 (!!req->r_inode_drop + !!req->r_dentry_drop +
1891 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1892 if (req->r_dentry_drop)
1893 len += req->r_dentry->d_name.len;
1894 if (req->r_old_dentry_drop)
1895 len += req->r_old_dentry->d_name.len;
1896
1897 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1898 if (!msg) {
1899 msg = ERR_PTR(-ENOMEM);
1900 goto out_free2;
1901 }
1902
1903 msg->hdr.version = cpu_to_le16(2);
1904 msg->hdr.tid = cpu_to_le64(req->r_tid);
1905
1906 head = msg->front.iov_base;
1907 p = msg->front.iov_base + sizeof(*head);
1908 end = msg->front.iov_base + msg->front.iov_len;
1909
1910 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1911 head->op = cpu_to_le32(req->r_op);
1912 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1913 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
1914 head->args = req->r_args;
1915
1916 ceph_encode_filepath(&p, end, ino1, path1);
1917 ceph_encode_filepath(&p, end, ino2, path2);
1918
1919
1920 req->r_request_release_offset = p - msg->front.iov_base;
1921
1922
1923 releases = 0;
1924 if (req->r_inode_drop)
1925 releases += ceph_encode_inode_release(&p,
1926 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
1927 mds, req->r_inode_drop, req->r_inode_unless, 0);
1928 if (req->r_dentry_drop)
1929 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1930 mds, req->r_dentry_drop, req->r_dentry_unless);
1931 if (req->r_old_dentry_drop)
1932 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1933 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1934 if (req->r_old_inode_drop)
1935 releases += ceph_encode_inode_release(&p,
1936 d_inode(req->r_old_dentry),
1937 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1938
1939 if (drop_cap_releases) {
1940 releases = 0;
1941 p = msg->front.iov_base + req->r_request_release_offset;
1942 }
1943
1944 head->num_releases = cpu_to_le16(releases);
1945
1946
1947 {
1948 struct ceph_timespec ts;
1949 ceph_encode_timespec(&ts, &req->r_stamp);
1950 ceph_encode_copy(&p, &ts, sizeof(ts));
1951 }
1952
1953 BUG_ON(p > end);
1954 msg->front.iov_len = p - msg->front.iov_base;
1955 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1956
1957 if (req->r_pagelist) {
1958 struct ceph_pagelist *pagelist = req->r_pagelist;
1959 atomic_inc(&pagelist->refcnt);
1960 ceph_msg_data_add_pagelist(msg, pagelist);
1961 msg->hdr.data_len = cpu_to_le32(pagelist->length);
1962 } else {
1963 msg->hdr.data_len = 0;
1964 }
1965
1966 msg->hdr.data_off = cpu_to_le16(0);
1967
1968out_free2:
1969 if (freepath2)
1970 kfree((char *)path2);
1971out_free1:
1972 if (freepath1)
1973 kfree((char *)path1);
1974out:
1975 return msg;
1976}
1977
1978
1979
1980
1981
1982static void complete_request(struct ceph_mds_client *mdsc,
1983 struct ceph_mds_request *req)
1984{
1985 if (req->r_callback)
1986 req->r_callback(mdsc, req);
1987 else
1988 complete_all(&req->r_completion);
1989}
1990
1991
1992
1993
1994static int __prepare_send_request(struct ceph_mds_client *mdsc,
1995 struct ceph_mds_request *req,
1996 int mds, bool drop_cap_releases)
1997{
1998 struct ceph_mds_request_head *rhead;
1999 struct ceph_msg *msg;
2000 int flags = 0;
2001
2002 req->r_attempts++;
2003 if (req->r_inode) {
2004 struct ceph_cap *cap =
2005 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2006
2007 if (cap)
2008 req->r_sent_on_mseq = cap->mseq;
2009 else
2010 req->r_sent_on_mseq = -1;
2011 }
2012 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2013 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2014
2015 if (req->r_got_unsafe) {
2016 void *p;
2017
2018
2019
2020
2021
2022
2023 msg = req->r_request;
2024 rhead = msg->front.iov_base;
2025
2026 flags = le32_to_cpu(rhead->flags);
2027 flags |= CEPH_MDS_FLAG_REPLAY;
2028 rhead->flags = cpu_to_le32(flags);
2029
2030 if (req->r_target_inode)
2031 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2032
2033 rhead->num_retry = req->r_attempts - 1;
2034
2035
2036 rhead->num_releases = 0;
2037
2038
2039 p = msg->front.iov_base + req->r_request_release_offset;
2040 {
2041 struct ceph_timespec ts;
2042 ceph_encode_timespec(&ts, &req->r_stamp);
2043 ceph_encode_copy(&p, &ts, sizeof(ts));
2044 }
2045
2046 msg->front.iov_len = p - msg->front.iov_base;
2047 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2048 return 0;
2049 }
2050
2051 if (req->r_request) {
2052 ceph_msg_put(req->r_request);
2053 req->r_request = NULL;
2054 }
2055 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2056 if (IS_ERR(msg)) {
2057 req->r_err = PTR_ERR(msg);
2058 return PTR_ERR(msg);
2059 }
2060 req->r_request = msg;
2061
2062 rhead = msg->front.iov_base;
2063 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2064 if (req->r_got_unsafe)
2065 flags |= CEPH_MDS_FLAG_REPLAY;
2066 if (req->r_locked_dir)
2067 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2068 rhead->flags = cpu_to_le32(flags);
2069 rhead->num_fwd = req->r_num_fwd;
2070 rhead->num_retry = req->r_attempts - 1;
2071 rhead->ino = 0;
2072
2073 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2074 return 0;
2075}
2076
2077
2078
2079
2080static int __do_request(struct ceph_mds_client *mdsc,
2081 struct ceph_mds_request *req)
2082{
2083 struct ceph_mds_session *session = NULL;
2084 int mds = -1;
2085 int err = 0;
2086
2087 if (req->r_err || req->r_got_result) {
2088 if (req->r_aborted)
2089 __unregister_request(mdsc, req);
2090 goto out;
2091 }
2092
2093 if (req->r_timeout &&
2094 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2095 dout("do_request timed out\n");
2096 err = -EIO;
2097 goto finish;
2098 }
2099 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2100 dout("do_request forced umount\n");
2101 err = -EIO;
2102 goto finish;
2103 }
2104 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2105 if (mdsc->mdsmap_err) {
2106 err = mdsc->mdsmap_err;
2107 dout("do_request mdsmap err %d\n", err);
2108 goto finish;
2109 }
2110 if (mdsc->mdsmap->m_epoch == 0) {
2111 dout("do_request no mdsmap, waiting for map\n");
2112 list_add(&req->r_wait, &mdsc->waiting_for_map);
2113 goto finish;
2114 }
2115 if (!(mdsc->fsc->mount_options->flags &
2116 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2117 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2118 err = -ENOENT;
2119 pr_info("probably no mds server is up\n");
2120 goto finish;
2121 }
2122 }
2123
2124 put_request_session(req);
2125
2126 mds = __choose_mds(mdsc, req);
2127 if (mds < 0 ||
2128 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2129 dout("do_request no mds or not active, waiting for map\n");
2130 list_add(&req->r_wait, &mdsc->waiting_for_map);
2131 goto out;
2132 }
2133
2134
2135 session = __ceph_lookup_mds_session(mdsc, mds);
2136 if (!session) {
2137 session = register_session(mdsc, mds);
2138 if (IS_ERR(session)) {
2139 err = PTR_ERR(session);
2140 goto finish;
2141 }
2142 }
2143 req->r_session = get_session(session);
2144
2145 dout("do_request mds%d session %p state %s\n", mds, session,
2146 ceph_session_state_name(session->s_state));
2147 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2148 session->s_state != CEPH_MDS_SESSION_HUNG) {
2149 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2150 err = -EACCES;
2151 goto out_session;
2152 }
2153 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2154 session->s_state == CEPH_MDS_SESSION_CLOSING)
2155 __open_session(mdsc, session);
2156 list_add(&req->r_wait, &session->s_waiting);
2157 goto out_session;
2158 }
2159
2160
2161 req->r_resend_mds = -1;
2162
2163 if (req->r_request_started == 0)
2164 req->r_request_started = jiffies;
2165
2166 err = __prepare_send_request(mdsc, req, mds, false);
2167 if (!err) {
2168 ceph_msg_get(req->r_request);
2169 ceph_con_send(&session->s_con, req->r_request);
2170 }
2171
2172out_session:
2173 ceph_put_mds_session(session);
2174finish:
2175 if (err) {
2176 dout("__do_request early error %d\n", err);
2177 req->r_err = err;
2178 complete_request(mdsc, req);
2179 __unregister_request(mdsc, req);
2180 }
2181out:
2182 return err;
2183}
2184
2185
2186
2187
2188static void __wake_requests(struct ceph_mds_client *mdsc,
2189 struct list_head *head)
2190{
2191 struct ceph_mds_request *req;
2192 LIST_HEAD(tmp_list);
2193
2194 list_splice_init(head, &tmp_list);
2195
2196 while (!list_empty(&tmp_list)) {
2197 req = list_entry(tmp_list.next,
2198 struct ceph_mds_request, r_wait);
2199 list_del_init(&req->r_wait);
2200 dout(" wake request %p tid %llu\n", req, req->r_tid);
2201 __do_request(mdsc, req);
2202 }
2203}
2204
2205
2206
2207
2208
2209static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2210{
2211 struct ceph_mds_request *req;
2212 struct rb_node *p = rb_first(&mdsc->request_tree);
2213
2214 dout("kick_requests mds%d\n", mds);
2215 while (p) {
2216 req = rb_entry(p, struct ceph_mds_request, r_node);
2217 p = rb_next(p);
2218 if (req->r_got_unsafe)
2219 continue;
2220 if (req->r_attempts > 0)
2221 continue;
2222 if (req->r_session &&
2223 req->r_session->s_mds == mds) {
2224 dout(" kicking tid %llu\n", req->r_tid);
2225 list_del_init(&req->r_wait);
2226 __do_request(mdsc, req);
2227 }
2228 }
2229}
2230
2231void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2232 struct ceph_mds_request *req)
2233{
2234 dout("submit_request on %p\n", req);
2235 mutex_lock(&mdsc->mutex);
2236 __register_request(mdsc, req, NULL);
2237 __do_request(mdsc, req);
2238 mutex_unlock(&mdsc->mutex);
2239}
2240
2241
2242
2243
2244
2245int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2246 struct inode *dir,
2247 struct ceph_mds_request *req)
2248{
2249 int err;
2250
2251 dout("do_request on %p\n", req);
2252
2253
2254 if (req->r_inode)
2255 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2256 if (req->r_locked_dir)
2257 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
2258 if (req->r_old_dentry_dir)
2259 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2260 CEPH_CAP_PIN);
2261
2262
2263 mutex_lock(&mdsc->mutex);
2264 __register_request(mdsc, req, dir);
2265 __do_request(mdsc, req);
2266
2267 if (req->r_err) {
2268 err = req->r_err;
2269 goto out;
2270 }
2271
2272
2273 mutex_unlock(&mdsc->mutex);
2274 dout("do_request waiting\n");
2275 if (!req->r_timeout && req->r_wait_for_completion) {
2276 err = req->r_wait_for_completion(mdsc, req);
2277 } else {
2278 long timeleft = wait_for_completion_killable_timeout(
2279 &req->r_completion,
2280 ceph_timeout_jiffies(req->r_timeout));
2281 if (timeleft > 0)
2282 err = 0;
2283 else if (!timeleft)
2284 err = -EIO;
2285 else
2286 err = timeleft;
2287 }
2288 dout("do_request waited, got %d\n", err);
2289 mutex_lock(&mdsc->mutex);
2290
2291
2292 if (req->r_got_result) {
2293 err = le32_to_cpu(req->r_reply_info.head->result);
2294 } else if (err < 0) {
2295 dout("aborted request %lld with %d\n", req->r_tid, err);
2296
2297
2298
2299
2300
2301
2302 mutex_lock(&req->r_fill_mutex);
2303 req->r_err = err;
2304 req->r_aborted = true;
2305 mutex_unlock(&req->r_fill_mutex);
2306
2307 if (req->r_locked_dir &&
2308 (req->r_op & CEPH_MDS_OP_WRITE))
2309 ceph_invalidate_dir_request(req);
2310 } else {
2311 err = req->r_err;
2312 }
2313
2314out:
2315 mutex_unlock(&mdsc->mutex);
2316 dout("do_request %p done, result %d\n", req, err);
2317 return err;
2318}
2319
2320
2321
2322
2323
2324void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2325{
2326 struct inode *inode = req->r_locked_dir;
2327
2328 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
2329
2330 ceph_dir_clear_complete(inode);
2331 if (req->r_dentry)
2332 ceph_invalidate_dentry_lease(req->r_dentry);
2333 if (req->r_old_dentry)
2334 ceph_invalidate_dentry_lease(req->r_old_dentry);
2335}
2336
2337
2338
2339
2340
2341
2342
2343
2344static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2345{
2346 struct ceph_mds_client *mdsc = session->s_mdsc;
2347 struct ceph_mds_request *req;
2348 struct ceph_mds_reply_head *head = msg->front.iov_base;
2349 struct ceph_mds_reply_info_parsed *rinfo;
2350 struct ceph_snap_realm *realm;
2351 u64 tid;
2352 int err, result;
2353 int mds = session->s_mds;
2354
2355 if (msg->front.iov_len < sizeof(*head)) {
2356 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2357 ceph_msg_dump(msg);
2358 return;
2359 }
2360
2361
2362 tid = le64_to_cpu(msg->hdr.tid);
2363 mutex_lock(&mdsc->mutex);
2364 req = lookup_get_request(mdsc, tid);
2365 if (!req) {
2366 dout("handle_reply on unknown tid %llu\n", tid);
2367 mutex_unlock(&mdsc->mutex);
2368 return;
2369 }
2370 dout("handle_reply %p\n", req);
2371
2372
2373 if (req->r_session != session) {
2374 pr_err("mdsc_handle_reply got %llu on session mds%d"
2375 " not mds%d\n", tid, session->s_mds,
2376 req->r_session ? req->r_session->s_mds : -1);
2377 mutex_unlock(&mdsc->mutex);
2378 goto out;
2379 }
2380
2381
2382 if ((req->r_got_unsafe && !head->safe) ||
2383 (req->r_got_safe && head->safe)) {
2384 pr_warn("got a dup %s reply on %llu from mds%d\n",
2385 head->safe ? "safe" : "unsafe", tid, mds);
2386 mutex_unlock(&mdsc->mutex);
2387 goto out;
2388 }
2389 if (req->r_got_safe) {
2390 pr_warn("got unsafe after safe on %llu from mds%d\n",
2391 tid, mds);
2392 mutex_unlock(&mdsc->mutex);
2393 goto out;
2394 }
2395
2396 result = le32_to_cpu(head->result);
2397
2398
2399
2400
2401
2402
2403
2404
2405 if (result == -ESTALE) {
2406 dout("got ESTALE on request %llu", req->r_tid);
2407 req->r_resend_mds = -1;
2408 if (req->r_direct_mode != USE_AUTH_MDS) {
2409 dout("not using auth, setting for that now");
2410 req->r_direct_mode = USE_AUTH_MDS;
2411 __do_request(mdsc, req);
2412 mutex_unlock(&mdsc->mutex);
2413 goto out;
2414 } else {
2415 int mds = __choose_mds(mdsc, req);
2416 if (mds >= 0 && mds != req->r_session->s_mds) {
2417 dout("but auth changed, so resending");
2418 __do_request(mdsc, req);
2419 mutex_unlock(&mdsc->mutex);
2420 goto out;
2421 }
2422 }
2423 dout("have to return ESTALE on request %llu", req->r_tid);
2424 }
2425
2426
2427 if (head->safe) {
2428 req->r_got_safe = true;
2429 __unregister_request(mdsc, req);
2430
2431 if (req->r_got_unsafe) {
2432
2433
2434
2435
2436
2437
2438
2439 dout("got safe reply %llu, mds%d\n", tid, mds);
2440 list_del_init(&req->r_unsafe_item);
2441
2442
2443 if (mdsc->stopping && !__get_oldest_req(mdsc))
2444 complete_all(&mdsc->safe_umount_waiters);
2445 mutex_unlock(&mdsc->mutex);
2446 goto out;
2447 }
2448 } else {
2449 req->r_got_unsafe = true;
2450 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2451 if (req->r_unsafe_dir) {
2452 struct ceph_inode_info *ci =
2453 ceph_inode(req->r_unsafe_dir);
2454 spin_lock(&ci->i_unsafe_lock);
2455 list_add_tail(&req->r_unsafe_dir_item,
2456 &ci->i_unsafe_dirops);
2457 spin_unlock(&ci->i_unsafe_lock);
2458 }
2459 }
2460
2461 dout("handle_reply tid %lld result %d\n", tid, result);
2462 rinfo = &req->r_reply_info;
2463 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2464 mutex_unlock(&mdsc->mutex);
2465
2466 mutex_lock(&session->s_mutex);
2467 if (err < 0) {
2468 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2469 ceph_msg_dump(msg);
2470 goto out_err;
2471 }
2472
2473
2474 realm = NULL;
2475 if (rinfo->snapblob_len) {
2476 down_write(&mdsc->snap_rwsem);
2477 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2478 rinfo->snapblob + rinfo->snapblob_len,
2479 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2480 &realm);
2481 downgrade_write(&mdsc->snap_rwsem);
2482 } else {
2483 down_read(&mdsc->snap_rwsem);
2484 }
2485
2486
2487 mutex_lock(&req->r_fill_mutex);
2488 current->journal_info = req;
2489 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2490 if (err == 0) {
2491 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2492 req->r_op == CEPH_MDS_OP_LSSNAP))
2493 ceph_readdir_prepopulate(req, req->r_session);
2494 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2495 }
2496 current->journal_info = NULL;
2497 mutex_unlock(&req->r_fill_mutex);
2498
2499 up_read(&mdsc->snap_rwsem);
2500 if (realm)
2501 ceph_put_snap_realm(mdsc, realm);
2502
2503 if (err == 0 && req->r_got_unsafe && req->r_target_inode) {
2504 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2505 spin_lock(&ci->i_unsafe_lock);
2506 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2507 spin_unlock(&ci->i_unsafe_lock);
2508 }
2509out_err:
2510 mutex_lock(&mdsc->mutex);
2511 if (!req->r_aborted) {
2512 if (err) {
2513 req->r_err = err;
2514 } else {
2515 req->r_reply = ceph_msg_get(msg);
2516 req->r_got_result = true;
2517 }
2518 } else {
2519 dout("reply arrived after request %lld was aborted\n", tid);
2520 }
2521 mutex_unlock(&mdsc->mutex);
2522
2523 mutex_unlock(&session->s_mutex);
2524
2525
2526 complete_request(mdsc, req);
2527out:
2528 ceph_mdsc_put_request(req);
2529 return;
2530}
2531
2532
2533
2534
2535
2536
2537static void handle_forward(struct ceph_mds_client *mdsc,
2538 struct ceph_mds_session *session,
2539 struct ceph_msg *msg)
2540{
2541 struct ceph_mds_request *req;
2542 u64 tid = le64_to_cpu(msg->hdr.tid);
2543 u32 next_mds;
2544 u32 fwd_seq;
2545 int err = -EINVAL;
2546 void *p = msg->front.iov_base;
2547 void *end = p + msg->front.iov_len;
2548
2549 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2550 next_mds = ceph_decode_32(&p);
2551 fwd_seq = ceph_decode_32(&p);
2552
2553 mutex_lock(&mdsc->mutex);
2554 req = lookup_get_request(mdsc, tid);
2555 if (!req) {
2556 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2557 goto out;
2558 }
2559
2560 if (req->r_aborted) {
2561 dout("forward tid %llu aborted, unregistering\n", tid);
2562 __unregister_request(mdsc, req);
2563 } else if (fwd_seq <= req->r_num_fwd) {
2564 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2565 tid, next_mds, req->r_num_fwd, fwd_seq);
2566 } else {
2567
2568 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2569 BUG_ON(req->r_err);
2570 BUG_ON(req->r_got_result);
2571 req->r_attempts = 0;
2572 req->r_num_fwd = fwd_seq;
2573 req->r_resend_mds = next_mds;
2574 put_request_session(req);
2575 __do_request(mdsc, req);
2576 }
2577 ceph_mdsc_put_request(req);
2578out:
2579 mutex_unlock(&mdsc->mutex);
2580 return;
2581
2582bad:
2583 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2584}
2585
2586
2587
2588
2589static void handle_session(struct ceph_mds_session *session,
2590 struct ceph_msg *msg)
2591{
2592 struct ceph_mds_client *mdsc = session->s_mdsc;
2593 u32 op;
2594 u64 seq;
2595 int mds = session->s_mds;
2596 struct ceph_mds_session_head *h = msg->front.iov_base;
2597 int wake = 0;
2598
2599
2600 if (msg->front.iov_len != sizeof(*h))
2601 goto bad;
2602 op = le32_to_cpu(h->op);
2603 seq = le64_to_cpu(h->seq);
2604
2605 mutex_lock(&mdsc->mutex);
2606 if (op == CEPH_SESSION_CLOSE)
2607 __unregister_session(mdsc, session);
2608
2609 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2610 mutex_unlock(&mdsc->mutex);
2611
2612 mutex_lock(&session->s_mutex);
2613
2614 dout("handle_session mds%d %s %p state %s seq %llu\n",
2615 mds, ceph_session_op_name(op), session,
2616 ceph_session_state_name(session->s_state), seq);
2617
2618 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2619 session->s_state = CEPH_MDS_SESSION_OPEN;
2620 pr_info("mds%d came back\n", session->s_mds);
2621 }
2622
2623 switch (op) {
2624 case CEPH_SESSION_OPEN:
2625 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2626 pr_info("mds%d reconnect success\n", session->s_mds);
2627 session->s_state = CEPH_MDS_SESSION_OPEN;
2628 renewed_caps(mdsc, session, 0);
2629 wake = 1;
2630 if (mdsc->stopping)
2631 __close_session(mdsc, session);
2632 break;
2633
2634 case CEPH_SESSION_RENEWCAPS:
2635 if (session->s_renew_seq == seq)
2636 renewed_caps(mdsc, session, 1);
2637 break;
2638
2639 case CEPH_SESSION_CLOSE:
2640 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2641 pr_info("mds%d reconnect denied\n", session->s_mds);
2642 cleanup_session_requests(mdsc, session);
2643 remove_session_caps(session);
2644 wake = 2;
2645 wake_up_all(&mdsc->session_close_wq);
2646 break;
2647
2648 case CEPH_SESSION_STALE:
2649 pr_info("mds%d caps went stale, renewing\n",
2650 session->s_mds);
2651 spin_lock(&session->s_gen_ttl_lock);
2652 session->s_cap_gen++;
2653 session->s_cap_ttl = jiffies - 1;
2654 spin_unlock(&session->s_gen_ttl_lock);
2655 send_renew_caps(mdsc, session);
2656 break;
2657
2658 case CEPH_SESSION_RECALL_STATE:
2659 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2660 break;
2661
2662 case CEPH_SESSION_FLUSHMSG:
2663 send_flushmsg_ack(mdsc, session, seq);
2664 break;
2665
2666 case CEPH_SESSION_FORCE_RO:
2667 dout("force_session_readonly %p\n", session);
2668 spin_lock(&session->s_cap_lock);
2669 session->s_readonly = true;
2670 spin_unlock(&session->s_cap_lock);
2671 wake_up_session_caps(session, 0);
2672 break;
2673
2674 case CEPH_SESSION_REJECT:
2675 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
2676 pr_info("mds%d rejected session\n", session->s_mds);
2677 session->s_state = CEPH_MDS_SESSION_REJECTED;
2678 cleanup_session_requests(mdsc, session);
2679 remove_session_caps(session);
2680 wake = 2;
2681 break;
2682
2683 default:
2684 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2685 WARN_ON(1);
2686 }
2687
2688 mutex_unlock(&session->s_mutex);
2689 if (wake) {
2690 mutex_lock(&mdsc->mutex);
2691 __wake_requests(mdsc, &session->s_waiting);
2692 if (wake == 2)
2693 kick_requests(mdsc, mds);
2694 mutex_unlock(&mdsc->mutex);
2695 }
2696 return;
2697
2698bad:
2699 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2700 (int)msg->front.iov_len);
2701 ceph_msg_dump(msg);
2702 return;
2703}
2704
2705
2706
2707
2708
2709static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2710 struct ceph_mds_session *session)
2711{
2712 struct ceph_mds_request *req, *nreq;
2713 struct rb_node *p;
2714 int err;
2715
2716 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2717
2718 mutex_lock(&mdsc->mutex);
2719 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2720 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2721 if (!err) {
2722 ceph_msg_get(req->r_request);
2723 ceph_con_send(&session->s_con, req->r_request);
2724 }
2725 }
2726
2727
2728
2729
2730
2731 p = rb_first(&mdsc->request_tree);
2732 while (p) {
2733 req = rb_entry(p, struct ceph_mds_request, r_node);
2734 p = rb_next(p);
2735 if (req->r_got_unsafe)
2736 continue;
2737 if (req->r_attempts == 0)
2738 continue;
2739 if (req->r_session &&
2740 req->r_session->s_mds == session->s_mds) {
2741 err = __prepare_send_request(mdsc, req,
2742 session->s_mds, true);
2743 if (!err) {
2744 ceph_msg_get(req->r_request);
2745 ceph_con_send(&session->s_con, req->r_request);
2746 }
2747 }
2748 }
2749 mutex_unlock(&mdsc->mutex);
2750}
2751
2752
2753
2754
2755static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2756 void *arg)
2757{
2758 union {
2759 struct ceph_mds_cap_reconnect v2;
2760 struct ceph_mds_cap_reconnect_v1 v1;
2761 } rec;
2762 struct ceph_inode_info *ci;
2763 struct ceph_reconnect_state *recon_state = arg;
2764 struct ceph_pagelist *pagelist = recon_state->pagelist;
2765 char *path;
2766 int pathlen, err;
2767 u64 pathbase;
2768 u64 snap_follows;
2769 struct dentry *dentry;
2770
2771 ci = cap->ci;
2772
2773 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2774 inode, ceph_vinop(inode), cap, cap->cap_id,
2775 ceph_cap_string(cap->issued));
2776 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2777 if (err)
2778 return err;
2779
2780 dentry = d_find_alias(inode);
2781 if (dentry) {
2782 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2783 if (IS_ERR(path)) {
2784 err = PTR_ERR(path);
2785 goto out_dput;
2786 }
2787 } else {
2788 path = NULL;
2789 pathlen = 0;
2790 pathbase = 0;
2791 }
2792
2793 spin_lock(&ci->i_ceph_lock);
2794 cap->seq = 0;
2795 cap->issue_seq = 0;
2796 cap->mseq = 0;
2797 cap->cap_gen = cap->session->s_cap_gen;
2798
2799 if (recon_state->msg_version >= 2) {
2800 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2801 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2802 rec.v2.issued = cpu_to_le32(cap->issued);
2803 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2804 rec.v2.pathbase = cpu_to_le64(pathbase);
2805 rec.v2.flock_len = 0;
2806 } else {
2807 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2808 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2809 rec.v1.issued = cpu_to_le32(cap->issued);
2810 rec.v1.size = cpu_to_le64(inode->i_size);
2811 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2812 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2813 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2814 rec.v1.pathbase = cpu_to_le64(pathbase);
2815 }
2816
2817 if (list_empty(&ci->i_cap_snaps)) {
2818 snap_follows = 0;
2819 } else {
2820 struct ceph_cap_snap *capsnap =
2821 list_first_entry(&ci->i_cap_snaps,
2822 struct ceph_cap_snap, ci_item);
2823 snap_follows = capsnap->follows;
2824 }
2825 spin_unlock(&ci->i_ceph_lock);
2826
2827 if (recon_state->msg_version >= 2) {
2828 int num_fcntl_locks, num_flock_locks;
2829 struct ceph_filelock *flocks;
2830 size_t struct_len, total_len = 0;
2831 u8 struct_v = 0;
2832
2833encode_again:
2834 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
2835 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2836 sizeof(struct ceph_filelock), GFP_NOFS);
2837 if (!flocks) {
2838 err = -ENOMEM;
2839 goto out_free;
2840 }
2841 err = ceph_encode_locks_to_buffer(inode, flocks,
2842 num_fcntl_locks,
2843 num_flock_locks);
2844 if (err) {
2845 kfree(flocks);
2846 if (err == -ENOSPC)
2847 goto encode_again;
2848 goto out_free;
2849 }
2850
2851 if (recon_state->msg_version >= 3) {
2852
2853 total_len = 2 * sizeof(u8) + sizeof(u32);
2854 struct_v = 2;
2855 }
2856
2857
2858
2859 struct_len = 2 * sizeof(u32) +
2860 (num_fcntl_locks + num_flock_locks) *
2861 sizeof(struct ceph_filelock);
2862 rec.v2.flock_len = cpu_to_le32(struct_len);
2863
2864 struct_len += sizeof(rec.v2);
2865 struct_len += sizeof(u32) + pathlen;
2866
2867 if (struct_v >= 2)
2868 struct_len += sizeof(u64);
2869
2870 total_len += struct_len;
2871 err = ceph_pagelist_reserve(pagelist, total_len);
2872
2873 if (!err) {
2874 if (recon_state->msg_version >= 3) {
2875 ceph_pagelist_encode_8(pagelist, struct_v);
2876 ceph_pagelist_encode_8(pagelist, 1);
2877 ceph_pagelist_encode_32(pagelist, struct_len);
2878 }
2879 ceph_pagelist_encode_string(pagelist, path, pathlen);
2880 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
2881 ceph_locks_to_pagelist(flocks, pagelist,
2882 num_fcntl_locks,
2883 num_flock_locks);
2884 if (struct_v >= 2)
2885 ceph_pagelist_encode_64(pagelist, snap_follows);
2886 }
2887 kfree(flocks);
2888 } else {
2889 size_t size = sizeof(u32) + pathlen + sizeof(rec.v1);
2890 err = ceph_pagelist_reserve(pagelist, size);
2891 if (!err) {
2892 ceph_pagelist_encode_string(pagelist, path, pathlen);
2893 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
2894 }
2895 }
2896
2897 recon_state->nr_caps++;
2898out_free:
2899 kfree(path);
2900out_dput:
2901 dput(dentry);
2902 return err;
2903}
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2919 struct ceph_mds_session *session)
2920{
2921 struct ceph_msg *reply;
2922 struct rb_node *p;
2923 int mds = session->s_mds;
2924 int err = -ENOMEM;
2925 int s_nr_caps;
2926 struct ceph_pagelist *pagelist;
2927 struct ceph_reconnect_state recon_state;
2928
2929 pr_info("mds%d reconnect start\n", mds);
2930
2931 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2932 if (!pagelist)
2933 goto fail_nopagelist;
2934 ceph_pagelist_init(pagelist);
2935
2936 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
2937 if (!reply)
2938 goto fail_nomsg;
2939
2940 mutex_lock(&session->s_mutex);
2941 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2942 session->s_seq = 0;
2943
2944 dout("session %p state %s\n", session,
2945 ceph_session_state_name(session->s_state));
2946
2947 spin_lock(&session->s_gen_ttl_lock);
2948 session->s_cap_gen++;
2949 spin_unlock(&session->s_gen_ttl_lock);
2950
2951 spin_lock(&session->s_cap_lock);
2952
2953 session->s_readonly = 0;
2954
2955
2956
2957
2958
2959 session->s_cap_reconnect = 1;
2960
2961 cleanup_cap_releases(mdsc, session);
2962
2963
2964 if (mdsc->fsc->sb->s_root)
2965 shrink_dcache_parent(mdsc->fsc->sb->s_root);
2966
2967 ceph_con_close(&session->s_con);
2968 ceph_con_open(&session->s_con,
2969 CEPH_ENTITY_TYPE_MDS, mds,
2970 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2971
2972
2973 replay_unsafe_requests(mdsc, session);
2974
2975 down_read(&mdsc->snap_rwsem);
2976
2977
2978 s_nr_caps = session->s_nr_caps;
2979 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
2980 if (err)
2981 goto fail;
2982
2983 recon_state.nr_caps = 0;
2984 recon_state.pagelist = pagelist;
2985 if (session->s_con.peer_features & CEPH_FEATURE_MDSENC)
2986 recon_state.msg_version = 3;
2987 else if (session->s_con.peer_features & CEPH_FEATURE_FLOCK)
2988 recon_state.msg_version = 2;
2989 else
2990 recon_state.msg_version = 1;
2991 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2992 if (err < 0)
2993 goto fail;
2994
2995 spin_lock(&session->s_cap_lock);
2996 session->s_cap_reconnect = 0;
2997 spin_unlock(&session->s_cap_lock);
2998
2999
3000
3001
3002
3003
3004 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3005 struct ceph_snap_realm *realm =
3006 rb_entry(p, struct ceph_snap_realm, node);
3007 struct ceph_mds_snaprealm_reconnect sr_rec;
3008
3009 dout(" adding snap realm %llx seq %lld parent %llx\n",
3010 realm->ino, realm->seq, realm->parent_ino);
3011 sr_rec.ino = cpu_to_le64(realm->ino);
3012 sr_rec.seq = cpu_to_le64(realm->seq);
3013 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3014 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3015 if (err)
3016 goto fail;
3017 }
3018
3019 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
3020
3021
3022 if (s_nr_caps != recon_state.nr_caps) {
3023 struct page *page = list_first_entry(&pagelist->head,
3024 struct page, lru);
3025 __le32 *addr = kmap_atomic(page);
3026 *addr = cpu_to_le32(recon_state.nr_caps);
3027 kunmap_atomic(addr);
3028 }
3029
3030 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3031 ceph_msg_data_add_pagelist(reply, pagelist);
3032
3033 ceph_early_kick_flushing_caps(mdsc, session);
3034
3035 ceph_con_send(&session->s_con, reply);
3036
3037 mutex_unlock(&session->s_mutex);
3038
3039 mutex_lock(&mdsc->mutex);
3040 __wake_requests(mdsc, &session->s_waiting);
3041 mutex_unlock(&mdsc->mutex);
3042
3043 up_read(&mdsc->snap_rwsem);
3044 return;
3045
3046fail:
3047 ceph_msg_put(reply);
3048 up_read(&mdsc->snap_rwsem);
3049 mutex_unlock(&session->s_mutex);
3050fail_nomsg:
3051 ceph_pagelist_release(pagelist);
3052fail_nopagelist:
3053 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
3054 return;
3055}
3056
3057
3058
3059
3060
3061
3062
3063
3064static void check_new_map(struct ceph_mds_client *mdsc,
3065 struct ceph_mdsmap *newmap,
3066 struct ceph_mdsmap *oldmap)
3067{
3068 int i;
3069 int oldstate, newstate;
3070 struct ceph_mds_session *s;
3071
3072 dout("check_new_map new %u old %u\n",
3073 newmap->m_epoch, oldmap->m_epoch);
3074
3075 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
3076 if (mdsc->sessions[i] == NULL)
3077 continue;
3078 s = mdsc->sessions[i];
3079 oldstate = ceph_mdsmap_get_state(oldmap, i);
3080 newstate = ceph_mdsmap_get_state(newmap, i);
3081
3082 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3083 i, ceph_mds_state_name(oldstate),
3084 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
3085 ceph_mds_state_name(newstate),
3086 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
3087 ceph_session_state_name(s->s_state));
3088
3089 if (i >= newmap->m_max_mds ||
3090 memcmp(ceph_mdsmap_get_addr(oldmap, i),
3091 ceph_mdsmap_get_addr(newmap, i),
3092 sizeof(struct ceph_entity_addr))) {
3093 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3094
3095
3096 __wake_requests(mdsc, &s->s_waiting);
3097 __unregister_session(mdsc, s);
3098 } else {
3099
3100 mutex_unlock(&mdsc->mutex);
3101 mutex_lock(&s->s_mutex);
3102 mutex_lock(&mdsc->mutex);
3103 ceph_con_close(&s->s_con);
3104 mutex_unlock(&s->s_mutex);
3105 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3106 }
3107 } else if (oldstate == newstate) {
3108 continue;
3109 }
3110
3111
3112
3113
3114 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
3115 newstate >= CEPH_MDS_STATE_RECONNECT) {
3116 mutex_unlock(&mdsc->mutex);
3117 send_mds_reconnect(mdsc, s);
3118 mutex_lock(&mdsc->mutex);
3119 }
3120
3121
3122
3123
3124 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3125 newstate >= CEPH_MDS_STATE_ACTIVE) {
3126 if (oldstate != CEPH_MDS_STATE_CREATING &&
3127 oldstate != CEPH_MDS_STATE_STARTING)
3128 pr_info("mds%d recovery completed\n", s->s_mds);
3129 kick_requests(mdsc, i);
3130 ceph_kick_flushing_caps(mdsc, s);
3131 wake_up_session_caps(s, 1);
3132 }
3133 }
3134
3135 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
3136 s = mdsc->sessions[i];
3137 if (!s)
3138 continue;
3139 if (!ceph_mdsmap_is_laggy(newmap, i))
3140 continue;
3141 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3142 s->s_state == CEPH_MDS_SESSION_HUNG ||
3143 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3144 dout(" connecting to export targets of laggy mds%d\n",
3145 i);
3146 __open_export_target_sessions(mdsc, s);
3147 }
3148 }
3149}
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3161{
3162 struct ceph_dentry_info *di = ceph_dentry(dentry);
3163
3164 ceph_put_mds_session(di->lease_session);
3165 di->lease_session = NULL;
3166}
3167
3168static void handle_lease(struct ceph_mds_client *mdsc,
3169 struct ceph_mds_session *session,
3170 struct ceph_msg *msg)
3171{
3172 struct super_block *sb = mdsc->fsc->sb;
3173 struct inode *inode;
3174 struct dentry *parent, *dentry;
3175 struct ceph_dentry_info *di;
3176 int mds = session->s_mds;
3177 struct ceph_mds_lease *h = msg->front.iov_base;
3178 u32 seq;
3179 struct ceph_vino vino;
3180 struct qstr dname;
3181 int release = 0;
3182
3183 dout("handle_lease from mds%d\n", mds);
3184
3185
3186 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3187 goto bad;
3188 vino.ino = le64_to_cpu(h->ino);
3189 vino.snap = CEPH_NOSNAP;
3190 seq = le32_to_cpu(h->seq);
3191 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3192 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3193 if (dname.len != get_unaligned_le32(h+1))
3194 goto bad;
3195
3196
3197 inode = ceph_find_inode(sb, vino);
3198 dout("handle_lease %s, ino %llx %p %.*s\n",
3199 ceph_lease_op_name(h->action), vino.ino, inode,
3200 dname.len, dname.name);
3201
3202 mutex_lock(&session->s_mutex);
3203 session->s_seq++;
3204
3205 if (inode == NULL) {
3206 dout("handle_lease no inode %llx\n", vino.ino);
3207 goto release;
3208 }
3209
3210
3211 parent = d_find_alias(inode);
3212 if (!parent) {
3213 dout("no parent dentry on inode %p\n", inode);
3214 WARN_ON(1);
3215 goto release;
3216 }
3217 dname.hash = full_name_hash(parent, dname.name, dname.len);
3218 dentry = d_lookup(parent, &dname);
3219 dput(parent);
3220 if (!dentry)
3221 goto release;
3222
3223 spin_lock(&dentry->d_lock);
3224 di = ceph_dentry(dentry);
3225 switch (h->action) {
3226 case CEPH_MDS_LEASE_REVOKE:
3227 if (di->lease_session == session) {
3228 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3229 h->seq = cpu_to_le32(di->lease_seq);
3230 __ceph_mdsc_drop_dentry_lease(dentry);
3231 }
3232 release = 1;
3233 break;
3234
3235 case CEPH_MDS_LEASE_RENEW:
3236 if (di->lease_session == session &&
3237 di->lease_gen == session->s_cap_gen &&
3238 di->lease_renew_from &&
3239 di->lease_renew_after == 0) {
3240 unsigned long duration =
3241 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
3242
3243 di->lease_seq = seq;
3244 di->time = di->lease_renew_from + duration;
3245 di->lease_renew_after = di->lease_renew_from +
3246 (duration >> 1);
3247 di->lease_renew_from = 0;
3248 }
3249 break;
3250 }
3251 spin_unlock(&dentry->d_lock);
3252 dput(dentry);
3253
3254 if (!release)
3255 goto out;
3256
3257release:
3258
3259 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3260 ceph_msg_get(msg);
3261 ceph_con_send(&session->s_con, msg);
3262
3263out:
3264 iput(inode);
3265 mutex_unlock(&session->s_mutex);
3266 return;
3267
3268bad:
3269 pr_err("corrupt lease message\n");
3270 ceph_msg_dump(msg);
3271}
3272
3273void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3274 struct inode *inode,
3275 struct dentry *dentry, char action,
3276 u32 seq)
3277{
3278 struct ceph_msg *msg;
3279 struct ceph_mds_lease *lease;
3280 int len = sizeof(*lease) + sizeof(u32);
3281 int dnamelen = 0;
3282
3283 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3284 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3285 dnamelen = dentry->d_name.len;
3286 len += dnamelen;
3287
3288 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
3289 if (!msg)
3290 return;
3291 lease = msg->front.iov_base;
3292 lease->action = action;
3293 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3294 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3295 lease->seq = cpu_to_le32(seq);
3296 put_unaligned_le32(dnamelen, lease + 1);
3297 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3298
3299
3300
3301
3302
3303
3304 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3305
3306 ceph_con_send(&session->s_con, msg);
3307}
3308
3309
3310
3311
3312static void drop_leases(struct ceph_mds_client *mdsc)
3313{
3314 int i;
3315
3316 dout("drop_leases\n");
3317 mutex_lock(&mdsc->mutex);
3318 for (i = 0; i < mdsc->max_sessions; i++) {
3319 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3320 if (!s)
3321 continue;
3322 mutex_unlock(&mdsc->mutex);
3323 mutex_lock(&s->s_mutex);
3324 mutex_unlock(&s->s_mutex);
3325 ceph_put_mds_session(s);
3326 mutex_lock(&mdsc->mutex);
3327 }
3328 mutex_unlock(&mdsc->mutex);
3329}
3330
3331
3332
3333
3334
3335
3336static void schedule_delayed(struct ceph_mds_client *mdsc)
3337{
3338 int delay = 5;
3339 unsigned hz = round_jiffies_relative(HZ * delay);
3340 schedule_delayed_work(&mdsc->delayed_work, hz);
3341}
3342
3343static void delayed_work(struct work_struct *work)
3344{
3345 int i;
3346 struct ceph_mds_client *mdsc =
3347 container_of(work, struct ceph_mds_client, delayed_work.work);
3348 int renew_interval;
3349 int renew_caps;
3350
3351 dout("mdsc delayed_work\n");
3352 ceph_check_delayed_caps(mdsc);
3353
3354 mutex_lock(&mdsc->mutex);
3355 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3356 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3357 mdsc->last_renew_caps);
3358 if (renew_caps)
3359 mdsc->last_renew_caps = jiffies;
3360
3361 for (i = 0; i < mdsc->max_sessions; i++) {
3362 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3363 if (s == NULL)
3364 continue;
3365 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3366 dout("resending session close request for mds%d\n",
3367 s->s_mds);
3368 request_close_session(mdsc, s);
3369 ceph_put_mds_session(s);
3370 continue;
3371 }
3372 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3373 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3374 s->s_state = CEPH_MDS_SESSION_HUNG;
3375 pr_info("mds%d hung\n", s->s_mds);
3376 }
3377 }
3378 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3379
3380 ceph_put_mds_session(s);
3381 continue;
3382 }
3383 mutex_unlock(&mdsc->mutex);
3384
3385 mutex_lock(&s->s_mutex);
3386 if (renew_caps)
3387 send_renew_caps(mdsc, s);
3388 else
3389 ceph_con_keepalive(&s->s_con);
3390 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3391 s->s_state == CEPH_MDS_SESSION_HUNG)
3392 ceph_send_cap_releases(mdsc, s);
3393 mutex_unlock(&s->s_mutex);
3394 ceph_put_mds_session(s);
3395
3396 mutex_lock(&mdsc->mutex);
3397 }
3398 mutex_unlock(&mdsc->mutex);
3399
3400 schedule_delayed(mdsc);
3401}
3402
3403int ceph_mdsc_init(struct ceph_fs_client *fsc)
3404
3405{
3406 struct ceph_mds_client *mdsc;
3407
3408 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3409 if (!mdsc)
3410 return -ENOMEM;
3411 mdsc->fsc = fsc;
3412 fsc->mdsc = mdsc;
3413 mutex_init(&mdsc->mutex);
3414 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3415 if (mdsc->mdsmap == NULL) {
3416 kfree(mdsc);
3417 return -ENOMEM;
3418 }
3419
3420 init_completion(&mdsc->safe_umount_waiters);
3421 init_waitqueue_head(&mdsc->session_close_wq);
3422 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3423 mdsc->sessions = NULL;
3424 atomic_set(&mdsc->num_sessions, 0);
3425 mdsc->max_sessions = 0;
3426 mdsc->stopping = 0;
3427 mdsc->last_snap_seq = 0;
3428 init_rwsem(&mdsc->snap_rwsem);
3429 mdsc->snap_realms = RB_ROOT;
3430 INIT_LIST_HEAD(&mdsc->snap_empty);
3431 spin_lock_init(&mdsc->snap_empty_lock);
3432 mdsc->last_tid = 0;
3433 mdsc->oldest_tid = 0;
3434 mdsc->request_tree = RB_ROOT;
3435 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3436 mdsc->last_renew_caps = jiffies;
3437 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3438 spin_lock_init(&mdsc->cap_delay_lock);
3439 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3440 spin_lock_init(&mdsc->snap_flush_lock);
3441 mdsc->last_cap_flush_tid = 1;
3442 INIT_LIST_HEAD(&mdsc->cap_flush_list);
3443 INIT_LIST_HEAD(&mdsc->cap_dirty);
3444 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3445 mdsc->num_cap_flushing = 0;
3446 spin_lock_init(&mdsc->cap_dirty_lock);
3447 init_waitqueue_head(&mdsc->cap_flushing_wq);
3448 spin_lock_init(&mdsc->dentry_lru_lock);
3449 INIT_LIST_HEAD(&mdsc->dentry_lru);
3450
3451 ceph_caps_init(mdsc);
3452 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3453
3454 init_rwsem(&mdsc->pool_perm_rwsem);
3455 mdsc->pool_perm_tree = RB_ROOT;
3456
3457 return 0;
3458}
3459
3460
3461
3462
3463
3464static void wait_requests(struct ceph_mds_client *mdsc)
3465{
3466 struct ceph_options *opts = mdsc->fsc->client->options;
3467 struct ceph_mds_request *req;
3468
3469 mutex_lock(&mdsc->mutex);
3470 if (__get_oldest_req(mdsc)) {
3471 mutex_unlock(&mdsc->mutex);
3472
3473 dout("wait_requests waiting for requests\n");
3474 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3475 ceph_timeout_jiffies(opts->mount_timeout));
3476
3477
3478 mutex_lock(&mdsc->mutex);
3479 while ((req = __get_oldest_req(mdsc))) {
3480 dout("wait_requests timed out on tid %llu\n",
3481 req->r_tid);
3482 __unregister_request(mdsc, req);
3483 }
3484 }
3485 mutex_unlock(&mdsc->mutex);
3486 dout("wait_requests done\n");
3487}
3488
3489
3490
3491
3492
3493void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3494{
3495 dout("pre_umount\n");
3496 mdsc->stopping = 1;
3497
3498 drop_leases(mdsc);
3499 ceph_flush_dirty_caps(mdsc);
3500 wait_requests(mdsc);
3501
3502
3503
3504
3505
3506 ceph_msgr_flush();
3507}
3508
3509
3510
3511
3512static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3513{
3514 struct ceph_mds_request *req = NULL, *nextreq;
3515 struct rb_node *n;
3516
3517 mutex_lock(&mdsc->mutex);
3518 dout("wait_unsafe_requests want %lld\n", want_tid);
3519restart:
3520 req = __get_oldest_req(mdsc);
3521 while (req && req->r_tid <= want_tid) {
3522
3523 n = rb_next(&req->r_node);
3524 if (n)
3525 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3526 else
3527 nextreq = NULL;
3528 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3529 (req->r_op & CEPH_MDS_OP_WRITE)) {
3530
3531 ceph_mdsc_get_request(req);
3532 if (nextreq)
3533 ceph_mdsc_get_request(nextreq);
3534 mutex_unlock(&mdsc->mutex);
3535 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3536 req->r_tid, want_tid);
3537 wait_for_completion(&req->r_safe_completion);
3538 mutex_lock(&mdsc->mutex);
3539 ceph_mdsc_put_request(req);
3540 if (!nextreq)
3541 break;
3542 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3543
3544 ceph_mdsc_put_request(nextreq);
3545 goto restart;
3546 }
3547 ceph_mdsc_put_request(nextreq);
3548 }
3549 req = nextreq;
3550 }
3551 mutex_unlock(&mdsc->mutex);
3552 dout("wait_unsafe_requests done\n");
3553}
3554
3555void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3556{
3557 u64 want_tid, want_flush;
3558
3559 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3560 return;
3561
3562 dout("sync\n");
3563 mutex_lock(&mdsc->mutex);
3564 want_tid = mdsc->last_tid;
3565 mutex_unlock(&mdsc->mutex);
3566
3567 ceph_flush_dirty_caps(mdsc);
3568 spin_lock(&mdsc->cap_dirty_lock);
3569 want_flush = mdsc->last_cap_flush_tid;
3570 if (!list_empty(&mdsc->cap_flush_list)) {
3571 struct ceph_cap_flush *cf =
3572 list_last_entry(&mdsc->cap_flush_list,
3573 struct ceph_cap_flush, g_list);
3574 cf->wake = true;
3575 }
3576 spin_unlock(&mdsc->cap_dirty_lock);
3577
3578 dout("sync want tid %lld flush_seq %lld\n",
3579 want_tid, want_flush);
3580
3581 wait_unsafe_requests(mdsc, want_tid);
3582 wait_caps_flush(mdsc, want_flush);
3583}
3584
3585
3586
3587
3588static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
3589{
3590 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3591 return true;
3592 return atomic_read(&mdsc->num_sessions) <= skipped;
3593}
3594
3595
3596
3597
3598void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3599{
3600 struct ceph_options *opts = mdsc->fsc->client->options;
3601 struct ceph_mds_session *session;
3602 int i;
3603 int skipped = 0;
3604
3605 dout("close_sessions\n");
3606
3607
3608 mutex_lock(&mdsc->mutex);
3609 for (i = 0; i < mdsc->max_sessions; i++) {
3610 session = __ceph_lookup_mds_session(mdsc, i);
3611 if (!session)
3612 continue;
3613 mutex_unlock(&mdsc->mutex);
3614 mutex_lock(&session->s_mutex);
3615 if (__close_session(mdsc, session) <= 0)
3616 skipped++;
3617 mutex_unlock(&session->s_mutex);
3618 ceph_put_mds_session(session);
3619 mutex_lock(&mdsc->mutex);
3620 }
3621 mutex_unlock(&mdsc->mutex);
3622
3623 dout("waiting for sessions to close\n");
3624 wait_event_timeout(mdsc->session_close_wq,
3625 done_closing_sessions(mdsc, skipped),
3626 ceph_timeout_jiffies(opts->mount_timeout));
3627
3628
3629 mutex_lock(&mdsc->mutex);
3630 for (i = 0; i < mdsc->max_sessions; i++) {
3631 if (mdsc->sessions[i]) {
3632 session = get_session(mdsc->sessions[i]);
3633 __unregister_session(mdsc, session);
3634 mutex_unlock(&mdsc->mutex);
3635 mutex_lock(&session->s_mutex);
3636 remove_session_caps(session);
3637 mutex_unlock(&session->s_mutex);
3638 ceph_put_mds_session(session);
3639 mutex_lock(&mdsc->mutex);
3640 }
3641 }
3642 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3643 mutex_unlock(&mdsc->mutex);
3644
3645 ceph_cleanup_empty_realms(mdsc);
3646
3647 cancel_delayed_work_sync(&mdsc->delayed_work);
3648
3649 dout("stopped\n");
3650}
3651
3652void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3653{
3654 struct ceph_mds_session *session;
3655 int mds;
3656
3657 dout("force umount\n");
3658
3659 mutex_lock(&mdsc->mutex);
3660 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3661 session = __ceph_lookup_mds_session(mdsc, mds);
3662 if (!session)
3663 continue;
3664 mutex_unlock(&mdsc->mutex);
3665 mutex_lock(&session->s_mutex);
3666 __close_session(mdsc, session);
3667 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3668 cleanup_session_requests(mdsc, session);
3669 remove_session_caps(session);
3670 }
3671 mutex_unlock(&session->s_mutex);
3672 ceph_put_mds_session(session);
3673 mutex_lock(&mdsc->mutex);
3674 kick_requests(mdsc, mds);
3675 }
3676 __wake_requests(mdsc, &mdsc->waiting_for_map);
3677 mutex_unlock(&mdsc->mutex);
3678}
3679
3680static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3681{
3682 dout("stop\n");
3683 cancel_delayed_work_sync(&mdsc->delayed_work);
3684 if (mdsc->mdsmap)
3685 ceph_mdsmap_destroy(mdsc->mdsmap);
3686 kfree(mdsc->sessions);
3687 ceph_caps_finalize(mdsc);
3688 ceph_pool_perm_destroy(mdsc);
3689}
3690
3691void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3692{
3693 struct ceph_mds_client *mdsc = fsc->mdsc;
3694
3695 dout("mdsc_destroy %p\n", mdsc);
3696 ceph_mdsc_stop(mdsc);
3697
3698
3699 ceph_msgr_flush();
3700
3701 fsc->mdsc = NULL;
3702 kfree(mdsc);
3703 dout("mdsc_destroy %p done\n", mdsc);
3704}
3705
3706void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3707{
3708 struct ceph_fs_client *fsc = mdsc->fsc;
3709 const char *mds_namespace = fsc->mount_options->mds_namespace;
3710 void *p = msg->front.iov_base;
3711 void *end = p + msg->front.iov_len;
3712 u32 epoch;
3713 u32 map_len;
3714 u32 num_fs;
3715 u32 mount_fscid = (u32)-1;
3716 u8 struct_v, struct_cv;
3717 int err = -EINVAL;
3718
3719 ceph_decode_need(&p, end, sizeof(u32), bad);
3720 epoch = ceph_decode_32(&p);
3721
3722 dout("handle_fsmap epoch %u\n", epoch);
3723
3724 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3725 struct_v = ceph_decode_8(&p);
3726 struct_cv = ceph_decode_8(&p);
3727 map_len = ceph_decode_32(&p);
3728
3729 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
3730 p += sizeof(u32) * 2;
3731
3732 num_fs = ceph_decode_32(&p);
3733 while (num_fs-- > 0) {
3734 void *info_p, *info_end;
3735 u32 info_len;
3736 u8 info_v, info_cv;
3737 u32 fscid, namelen;
3738
3739 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3740 info_v = ceph_decode_8(&p);
3741 info_cv = ceph_decode_8(&p);
3742 info_len = ceph_decode_32(&p);
3743 ceph_decode_need(&p, end, info_len, bad);
3744 info_p = p;
3745 info_end = p + info_len;
3746 p = info_end;
3747
3748 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
3749 fscid = ceph_decode_32(&info_p);
3750 namelen = ceph_decode_32(&info_p);
3751 ceph_decode_need(&info_p, info_end, namelen, bad);
3752
3753 if (mds_namespace &&
3754 strlen(mds_namespace) == namelen &&
3755 !strncmp(mds_namespace, (char *)info_p, namelen)) {
3756 mount_fscid = fscid;
3757 break;
3758 }
3759 }
3760
3761 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
3762 if (mount_fscid != (u32)-1) {
3763 fsc->client->monc.fs_cluster_id = mount_fscid;
3764 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
3765 0, true);
3766 ceph_monc_renew_subs(&fsc->client->monc);
3767 } else {
3768 err = -ENOENT;
3769 goto err_out;
3770 }
3771 return;
3772bad:
3773 pr_err("error decoding fsmap\n");
3774err_out:
3775 mutex_lock(&mdsc->mutex);
3776 mdsc->mdsmap_err = -ENOENT;
3777 __wake_requests(mdsc, &mdsc->waiting_for_map);
3778 mutex_unlock(&mdsc->mutex);
3779 return;
3780}
3781
3782
3783
3784
3785void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3786{
3787 u32 epoch;
3788 u32 maplen;
3789 void *p = msg->front.iov_base;
3790 void *end = p + msg->front.iov_len;
3791 struct ceph_mdsmap *newmap, *oldmap;
3792 struct ceph_fsid fsid;
3793 int err = -EINVAL;
3794
3795 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3796 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3797 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3798 return;
3799 epoch = ceph_decode_32(&p);
3800 maplen = ceph_decode_32(&p);
3801 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3802
3803
3804 mutex_lock(&mdsc->mutex);
3805 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3806 dout("handle_map epoch %u <= our %u\n",
3807 epoch, mdsc->mdsmap->m_epoch);
3808 mutex_unlock(&mdsc->mutex);
3809 return;
3810 }
3811
3812 newmap = ceph_mdsmap_decode(&p, end);
3813 if (IS_ERR(newmap)) {
3814 err = PTR_ERR(newmap);
3815 goto bad_unlock;
3816 }
3817
3818
3819 if (mdsc->mdsmap) {
3820 oldmap = mdsc->mdsmap;
3821 mdsc->mdsmap = newmap;
3822 check_new_map(mdsc, newmap, oldmap);
3823 ceph_mdsmap_destroy(oldmap);
3824 } else {
3825 mdsc->mdsmap = newmap;
3826 }
3827 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3828
3829 __wake_requests(mdsc, &mdsc->waiting_for_map);
3830 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
3831 mdsc->mdsmap->m_epoch);
3832
3833 mutex_unlock(&mdsc->mutex);
3834 schedule_delayed(mdsc);
3835 return;
3836
3837bad_unlock:
3838 mutex_unlock(&mdsc->mutex);
3839bad:
3840 pr_err("error decoding mdsmap %d\n", err);
3841 return;
3842}
3843
3844static struct ceph_connection *con_get(struct ceph_connection *con)
3845{
3846 struct ceph_mds_session *s = con->private;
3847
3848 if (get_session(s)) {
3849 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3850 return con;
3851 }
3852 dout("mdsc con_get %p FAIL\n", s);
3853 return NULL;
3854}
3855
3856static void con_put(struct ceph_connection *con)
3857{
3858 struct ceph_mds_session *s = con->private;
3859
3860 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
3861 ceph_put_mds_session(s);
3862}
3863
3864
3865
3866
3867
3868static void peer_reset(struct ceph_connection *con)
3869{
3870 struct ceph_mds_session *s = con->private;
3871 struct ceph_mds_client *mdsc = s->s_mdsc;
3872
3873 pr_warn("mds%d closed our session\n", s->s_mds);
3874 send_mds_reconnect(mdsc, s);
3875}
3876
3877static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3878{
3879 struct ceph_mds_session *s = con->private;
3880 struct ceph_mds_client *mdsc = s->s_mdsc;
3881 int type = le16_to_cpu(msg->hdr.type);
3882
3883 mutex_lock(&mdsc->mutex);
3884 if (__verify_registered_session(mdsc, s) < 0) {
3885 mutex_unlock(&mdsc->mutex);
3886 goto out;
3887 }
3888 mutex_unlock(&mdsc->mutex);
3889
3890 switch (type) {
3891 case CEPH_MSG_MDS_MAP:
3892 ceph_mdsc_handle_mdsmap(mdsc, msg);
3893 break;
3894 case CEPH_MSG_FS_MAP_USER:
3895 ceph_mdsc_handle_fsmap(mdsc, msg);
3896 break;
3897 case CEPH_MSG_CLIENT_SESSION:
3898 handle_session(s, msg);
3899 break;
3900 case CEPH_MSG_CLIENT_REPLY:
3901 handle_reply(s, msg);
3902 break;
3903 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3904 handle_forward(mdsc, s, msg);
3905 break;
3906 case CEPH_MSG_CLIENT_CAPS:
3907 ceph_handle_caps(s, msg);
3908 break;
3909 case CEPH_MSG_CLIENT_SNAP:
3910 ceph_handle_snap(mdsc, s, msg);
3911 break;
3912 case CEPH_MSG_CLIENT_LEASE:
3913 handle_lease(mdsc, s, msg);
3914 break;
3915
3916 default:
3917 pr_err("received unknown message type %d %s\n", type,
3918 ceph_msg_type_name(type));
3919 }
3920out:
3921 ceph_msg_put(msg);
3922}
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
3933 int *proto, int force_new)
3934{
3935 struct ceph_mds_session *s = con->private;
3936 struct ceph_mds_client *mdsc = s->s_mdsc;
3937 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3938 struct ceph_auth_handshake *auth = &s->s_auth;
3939
3940 if (force_new && auth->authorizer) {
3941 ceph_auth_destroy_authorizer(auth->authorizer);
3942 auth->authorizer = NULL;
3943 }
3944 if (!auth->authorizer) {
3945 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3946 auth);
3947 if (ret)
3948 return ERR_PTR(ret);
3949 } else {
3950 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3951 auth);
3952 if (ret)
3953 return ERR_PTR(ret);
3954 }
3955 *proto = ac->protocol;
3956
3957 return auth;
3958}
3959
3960
3961static int verify_authorizer_reply(struct ceph_connection *con)
3962{
3963 struct ceph_mds_session *s = con->private;
3964 struct ceph_mds_client *mdsc = s->s_mdsc;
3965 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3966
3967 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
3968}
3969
3970static int invalidate_authorizer(struct ceph_connection *con)
3971{
3972 struct ceph_mds_session *s = con->private;
3973 struct ceph_mds_client *mdsc = s->s_mdsc;
3974 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3975
3976 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3977
3978 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
3979}
3980
3981static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3982 struct ceph_msg_header *hdr, int *skip)
3983{
3984 struct ceph_msg *msg;
3985 int type = (int) le16_to_cpu(hdr->type);
3986 int front_len = (int) le32_to_cpu(hdr->front_len);
3987
3988 if (con->in_msg)
3989 return con->in_msg;
3990
3991 *skip = 0;
3992 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3993 if (!msg) {
3994 pr_err("unable to allocate msg type %d len %d\n",
3995 type, front_len);
3996 return NULL;
3997 }
3998
3999 return msg;
4000}
4001
4002static int mds_sign_message(struct ceph_msg *msg)
4003{
4004 struct ceph_mds_session *s = msg->con->private;
4005 struct ceph_auth_handshake *auth = &s->s_auth;
4006
4007 return ceph_auth_sign_message(auth, msg);
4008}
4009
4010static int mds_check_message_signature(struct ceph_msg *msg)
4011{
4012 struct ceph_mds_session *s = msg->con->private;
4013 struct ceph_auth_handshake *auth = &s->s_auth;
4014
4015 return ceph_auth_check_message_signature(auth, msg);
4016}
4017
4018static const struct ceph_connection_operations mds_con_ops = {
4019 .get = con_get,
4020 .put = con_put,
4021 .dispatch = dispatch,
4022 .get_authorizer = get_authorizer,
4023 .verify_authorizer_reply = verify_authorizer_reply,
4024 .invalidate_authorizer = invalidate_authorizer,
4025 .peer_reset = peer_reset,
4026 .alloc_msg = mds_alloc_msg,
4027 .sign_message = mds_sign_message,
4028 .check_message_signature = mds_check_message_signature,
4029};
4030
4031
4032