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USB: serial: option: add support for D-Link DWM-157 C1
[linux/fpc-iii.git] / fs / ceph / mds_client.c
blobf54f77037d22b56fa0c563d633160ae1b56e6fa5
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/fs.h>
4 #include <linux/wait.h>
5 #include <linux/slab.h>
6 #include <linux/gfp.h>
7 #include <linux/sched.h>
8 #include <linux/debugfs.h>
9 #include <linux/seq_file.h>
10 #include <linux/utsname.h>
11 #include <linux/ratelimit.h>
12
13 #include "super.h"
14 #include "mds_client.h"
15
16 #include <linux/ceph/ceph_features.h>
17 #include <linux/ceph/messenger.h>
18 #include <linux/ceph/decode.h>
19 #include <linux/ceph/pagelist.h>
20 #include <linux/ceph/auth.h>
21 #include <linux/ceph/debugfs.h>
22
23 /*
24 * A cluster of MDS (metadata server) daemons is responsible for
25 * managing the file system namespace (the directory hierarchy and
26 * inodes) and for coordinating shared access to storage. Metadata is
27 * partitioning hierarchically across a number of servers, and that
28 * partition varies over time as the cluster adjusts the distribution
29 * in order to balance load.
30 *
31 * The MDS client is primarily responsible to managing synchronous
32 * metadata requests for operations like open, unlink, and so forth.
33 * If there is a MDS failure, we find out about it when we (possibly
34 * request and) receive a new MDS map, and can resubmit affected
35 * requests.
36 *
37 * For the most part, though, we take advantage of a lossless
38 * communications channel to the MDS, and do not need to worry about
39 * timing out or resubmitting requests.
40 *
41 * We maintain a stateful "session" with each MDS we interact with.
42 * Within each session, we sent periodic heartbeat messages to ensure
43 * any capabilities or leases we have been issues remain valid. If
44 * the session times out and goes stale, our leases and capabilities
45 * are no longer valid.
46 */
47
48 struct ceph_reconnect_state {
49 int nr_caps;
50 struct ceph_pagelist *pagelist;
51 bool flock;
52 };
53
54 static void __wake_requests(struct ceph_mds_client *mdsc,
55 struct list_head *head);
56
57 static const struct ceph_connection_operations mds_con_ops;
58
59
60 /*
61 * mds reply parsing
62 */
63
64 /*
65 * parse individual inode info
66 */
67 static int parse_reply_info_in(void **p, void *end,
68 struct ceph_mds_reply_info_in *info,
69 u64 features)
70 {
71 int err = -EIO;
72
73 info->in = *p;
74 *p += sizeof(struct ceph_mds_reply_inode) +
75 sizeof(*info->in->fragtree.splits) *
76 le32_to_cpu(info->in->fragtree.nsplits);
77
78 ceph_decode_32_safe(p, end, info->symlink_len, bad);
79 ceph_decode_need(p, end, info->symlink_len, bad);
80 info->symlink = *p;
81 *p += info->symlink_len;
82
83 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
84 ceph_decode_copy_safe(p, end, &info->dir_layout,
85 sizeof(info->dir_layout), bad);
86 else
87 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
88
89 ceph_decode_32_safe(p, end, info->xattr_len, bad);
90 ceph_decode_need(p, end, info->xattr_len, bad);
91 info->xattr_data = *p;
92 *p += info->xattr_len;
93
94 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
95 ceph_decode_64_safe(p, end, info->inline_version, bad);
96 ceph_decode_32_safe(p, end, info->inline_len, bad);
97 ceph_decode_need(p, end, info->inline_len, bad);
98 info->inline_data = *p;
99 *p += info->inline_len;
100 } else
101 info->inline_version = CEPH_INLINE_NONE;
102
103 return 0;
104 bad:
105 return err;
106 }
107
108 /*
109 * parse a normal reply, which may contain a (dir+)dentry and/or a
110 * target inode.
111 */
112 static int parse_reply_info_trace(void **p, void *end,
113 struct ceph_mds_reply_info_parsed *info,
114 u64 features)
115 {
116 int err;
117
118 if (info->head->is_dentry) {
119 err = parse_reply_info_in(p, end, &info->diri, features);
120 if (err < 0)
121 goto out_bad;
122
123 if (unlikely(*p + sizeof(*info->dirfrag) > end))
124 goto bad;
125 info->dirfrag = *p;
126 *p += sizeof(*info->dirfrag) +
127 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
128 if (unlikely(*p > end))
129 goto bad;
130
131 ceph_decode_32_safe(p, end, info->dname_len, bad);
132 ceph_decode_need(p, end, info->dname_len, bad);
133 info->dname = *p;
134 *p += info->dname_len;
135 info->dlease = *p;
136 *p += sizeof(*info->dlease);
137 }
138
139 if (info->head->is_target) {
140 err = parse_reply_info_in(p, end, &info->targeti, features);
141 if (err < 0)
142 goto out_bad;
143 }
144
145 if (unlikely(*p != end))
146 goto bad;
147 return 0;
148
149 bad:
150 err = -EIO;
151 out_bad:
152 pr_err("problem parsing mds trace %d\n", err);
153 return err;
154 }
155
156 /*
157 * parse readdir results
158 */
159 static int parse_reply_info_dir(void **p, void *end,
160 struct ceph_mds_reply_info_parsed *info,
161 u64 features)
162 {
163 u32 num, i = 0;
164 int err;
165
166 info->dir_dir = *p;
167 if (*p + sizeof(*info->dir_dir) > end)
168 goto bad;
169 *p += sizeof(*info->dir_dir) +
170 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
171 if (*p > end)
172 goto bad;
173
174 ceph_decode_need(p, end, sizeof(num) + 2, bad);
175 num = ceph_decode_32(p);
176 info->dir_end = ceph_decode_8(p);
177 info->dir_complete = ceph_decode_8(p);
178 if (num == 0)
179 goto done;
180
181 BUG_ON(!info->dir_in);
182 info->dir_dname = (void *)(info->dir_in + num);
183 info->dir_dname_len = (void *)(info->dir_dname + num);
184 info->dir_dlease = (void *)(info->dir_dname_len + num);
185 if ((unsigned long)(info->dir_dlease + num) >
186 (unsigned long)info->dir_in + info->dir_buf_size) {
187 pr_err("dir contents are larger than expected\n");
188 WARN_ON(1);
189 goto bad;
190 }
191
192 info->dir_nr = num;
193 while (num) {
194 /* dentry */
195 ceph_decode_need(p, end, sizeof(u32)*2, bad);
196 info->dir_dname_len[i] = ceph_decode_32(p);
197 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
198 info->dir_dname[i] = *p;
199 *p += info->dir_dname_len[i];
200 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
201 info->dir_dname[i]);
202 info->dir_dlease[i] = *p;
203 *p += sizeof(struct ceph_mds_reply_lease);
204
205 /* inode */
206 err = parse_reply_info_in(p, end, &info->dir_in[i], features);
207 if (err < 0)
208 goto out_bad;
209 i++;
210 num--;
211 }
212
213 done:
214 if (*p != end)
215 goto bad;
216 return 0;
217
218 bad:
219 err = -EIO;
220 out_bad:
221 pr_err("problem parsing dir contents %d\n", err);
222 return err;
223 }
224
225 /*
226 * parse fcntl F_GETLK results
227 */
228 static int parse_reply_info_filelock(void **p, void *end,
229 struct ceph_mds_reply_info_parsed *info,
230 u64 features)
231 {
232 if (*p + sizeof(*info->filelock_reply) > end)
233 goto bad;
234
235 info->filelock_reply = *p;
236 *p += sizeof(*info->filelock_reply);
237
238 if (unlikely(*p != end))
239 goto bad;
240 return 0;
241
242 bad:
243 return -EIO;
244 }
245
246 /*
247 * parse create results
248 */
249 static int parse_reply_info_create(void **p, void *end,
250 struct ceph_mds_reply_info_parsed *info,
251 u64 features)
252 {
253 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
254 if (*p == end) {
255 info->has_create_ino = false;
256 } else {
257 info->has_create_ino = true;
258 info->ino = ceph_decode_64(p);
259 }
260 }
261
262 if (unlikely(*p != end))
263 goto bad;
264 return 0;
265
266 bad:
267 return -EIO;
268 }
269
270 /*
271 * parse extra results
272 */
273 static int parse_reply_info_extra(void **p, void *end,
274 struct ceph_mds_reply_info_parsed *info,
275 u64 features)
276 {
277 u32 op = le32_to_cpu(info->head->op);
278
279 if (op == CEPH_MDS_OP_GETFILELOCK)
280 return parse_reply_info_filelock(p, end, info, features);
281 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
282 return parse_reply_info_dir(p, end, info, features);
283 else if (op == CEPH_MDS_OP_CREATE)
284 return parse_reply_info_create(p, end, info, features);
285 else
286 return -EIO;
287 }
288
289 /*
290 * parse entire mds reply
291 */
292 static int parse_reply_info(struct ceph_msg *msg,
293 struct ceph_mds_reply_info_parsed *info,
294 u64 features)
295 {
296 void *p, *end;
297 u32 len;
298 int err;
299
300 info->head = msg->front.iov_base;
301 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
302 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
303
304 /* trace */
305 ceph_decode_32_safe(&p, end, len, bad);
306 if (len > 0) {
307 ceph_decode_need(&p, end, len, bad);
308 err = parse_reply_info_trace(&p, p+len, info, features);
309 if (err < 0)
310 goto out_bad;
311 }
312
313 /* extra */
314 ceph_decode_32_safe(&p, end, len, bad);
315 if (len > 0) {
316 ceph_decode_need(&p, end, len, bad);
317 err = parse_reply_info_extra(&p, p+len, info, features);
318 if (err < 0)
319 goto out_bad;
320 }
321
322 /* snap blob */
323 ceph_decode_32_safe(&p, end, len, bad);
324 info->snapblob_len = len;
325 info->snapblob = p;
326 p += len;
327
328 if (p != end)
329 goto bad;
330 return 0;
331
332 bad:
333 err = -EIO;
334 out_bad:
335 pr_err("mds parse_reply err %d\n", err);
336 return err;
337 }
338
339 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
340 {
341 if (!info->dir_in)
342 return;
343 free_pages((unsigned long)info->dir_in, get_order(info->dir_buf_size));
344 }
345
346
347 /*
348 * sessions
349 */
350 const char *ceph_session_state_name(int s)
351 {
352 switch (s) {
353 case CEPH_MDS_SESSION_NEW: return "new";
354 case CEPH_MDS_SESSION_OPENING: return "opening";
355 case CEPH_MDS_SESSION_OPEN: return "open";
356 case CEPH_MDS_SESSION_HUNG: return "hung";
357 case CEPH_MDS_SESSION_CLOSING: return "closing";
358 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
359 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
360 default: return "???";
361 }
362 }
363
364 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
365 {
366 if (atomic_inc_not_zero(&s->s_ref)) {
367 dout("mdsc get_session %p %d -> %d\n", s,
368 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
369 return s;
370 } else {
371 dout("mdsc get_session %p 0 -- FAIL", s);
372 return NULL;
373 }
374 }
375
376 void ceph_put_mds_session(struct ceph_mds_session *s)
377 {
378 dout("mdsc put_session %p %d -> %d\n", s,
379 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
380 if (atomic_dec_and_test(&s->s_ref)) {
381 if (s->s_auth.authorizer)
382 ceph_auth_destroy_authorizer(
383 s->s_mdsc->fsc->client->monc.auth,
384 s->s_auth.authorizer);
385 kfree(s);
386 }
387 }
388
389 /*
390 * called under mdsc->mutex
391 */
392 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
393 int mds)
394 {
395 struct ceph_mds_session *session;
396
397 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
398 return NULL;
399 session = mdsc->sessions[mds];
400 dout("lookup_mds_session %p %d\n", session,
401 atomic_read(&session->s_ref));
402 get_session(session);
403 return session;
404 }
405
406 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
407 {
408 if (mds >= mdsc->max_sessions)
409 return false;
410 return mdsc->sessions[mds];
411 }
412
413 static int __verify_registered_session(struct ceph_mds_client *mdsc,
414 struct ceph_mds_session *s)
415 {
416 if (s->s_mds >= mdsc->max_sessions ||
417 mdsc->sessions[s->s_mds] != s)
418 return -ENOENT;
419 return 0;
420 }
421
422 /*
423 * create+register a new session for given mds.
424 * called under mdsc->mutex.
425 */
426 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
427 int mds)
428 {
429 struct ceph_mds_session *s;
430
431 if (mds >= mdsc->mdsmap->m_max_mds)
432 return ERR_PTR(-EINVAL);
433
434 s = kzalloc(sizeof(*s), GFP_NOFS);
435 if (!s)
436 return ERR_PTR(-ENOMEM);
437 s->s_mdsc = mdsc;
438 s->s_mds = mds;
439 s->s_state = CEPH_MDS_SESSION_NEW;
440 s->s_ttl = 0;
441 s->s_seq = 0;
442 mutex_init(&s->s_mutex);
443
444 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
445
446 spin_lock_init(&s->s_gen_ttl_lock);
447 s->s_cap_gen = 0;
448 s->s_cap_ttl = jiffies - 1;
449
450 spin_lock_init(&s->s_cap_lock);
451 s->s_renew_requested = 0;
452 s->s_renew_seq = 0;
453 INIT_LIST_HEAD(&s->s_caps);
454 s->s_nr_caps = 0;
455 s->s_trim_caps = 0;
456 atomic_set(&s->s_ref, 1);
457 INIT_LIST_HEAD(&s->s_waiting);
458 INIT_LIST_HEAD(&s->s_unsafe);
459 s->s_num_cap_releases = 0;
460 s->s_cap_reconnect = 0;
461 s->s_cap_iterator = NULL;
462 INIT_LIST_HEAD(&s->s_cap_releases);
463 INIT_LIST_HEAD(&s->s_cap_flushing);
464 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
465
466 dout("register_session mds%d\n", mds);
467 if (mds >= mdsc->max_sessions) {
468 int newmax = 1 << get_count_order(mds+1);
469 struct ceph_mds_session **sa;
470
471 dout("register_session realloc to %d\n", newmax);
472 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
473 if (sa == NULL)
474 goto fail_realloc;
475 if (mdsc->sessions) {
476 memcpy(sa, mdsc->sessions,
477 mdsc->max_sessions * sizeof(void *));
478 kfree(mdsc->sessions);
479 }
480 mdsc->sessions = sa;
481 mdsc->max_sessions = newmax;
482 }
483 mdsc->sessions[mds] = s;
484 atomic_inc(&mdsc->num_sessions);
485 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
486
487 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
488 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
489
490 return s;
491
492 fail_realloc:
493 kfree(s);
494 return ERR_PTR(-ENOMEM);
495 }
496
497 /*
498 * called under mdsc->mutex
499 */
500 static void __unregister_session(struct ceph_mds_client *mdsc,
501 struct ceph_mds_session *s)
502 {
503 dout("__unregister_session mds%d %p\n", s->s_mds, s);
504 BUG_ON(mdsc->sessions[s->s_mds] != s);
505 mdsc->sessions[s->s_mds] = NULL;
506 ceph_con_close(&s->s_con);
507 ceph_put_mds_session(s);
508 atomic_dec(&mdsc->num_sessions);
509 }
510
511 /*
512 * drop session refs in request.
513 *
514 * should be last request ref, or hold mdsc->mutex
515 */
516 static void put_request_session(struct ceph_mds_request *req)
517 {
518 if (req->r_session) {
519 ceph_put_mds_session(req->r_session);
520 req->r_session = NULL;
521 }
522 }
523
524 void ceph_mdsc_release_request(struct kref *kref)
525 {
526 struct ceph_mds_request *req = container_of(kref,
527 struct ceph_mds_request,
528 r_kref);
529 destroy_reply_info(&req->r_reply_info);
530 if (req->r_request)
531 ceph_msg_put(req->r_request);
532 if (req->r_reply)
533 ceph_msg_put(req->r_reply);
534 if (req->r_inode) {
535 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
536 iput(req->r_inode);
537 }
538 if (req->r_locked_dir)
539 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
540 iput(req->r_target_inode);
541 if (req->r_dentry)
542 dput(req->r_dentry);
543 if (req->r_old_dentry)
544 dput(req->r_old_dentry);
545 if (req->r_old_dentry_dir) {
546 /*
547 * track (and drop pins for) r_old_dentry_dir
548 * separately, since r_old_dentry's d_parent may have
549 * changed between the dir mutex being dropped and
550 * this request being freed.
551 */
552 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
553 CEPH_CAP_PIN);
554 iput(req->r_old_dentry_dir);
555 }
556 kfree(req->r_path1);
557 kfree(req->r_path2);
558 if (req->r_pagelist)
559 ceph_pagelist_release(req->r_pagelist);
560 put_request_session(req);
561 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
562 kfree(req);
563 }
564
565 /*
566 * lookup session, bump ref if found.
567 *
568 * called under mdsc->mutex.
569 */
570 static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
571 u64 tid)
572 {
573 struct ceph_mds_request *req;
574 struct rb_node *n = mdsc->request_tree.rb_node;
575
576 while (n) {
577 req = rb_entry(n, struct ceph_mds_request, r_node);
578 if (tid < req->r_tid)
579 n = n->rb_left;
580 else if (tid > req->r_tid)
581 n = n->rb_right;
582 else {
583 ceph_mdsc_get_request(req);
584 return req;
585 }
586 }
587 return NULL;
588 }
589
590 static void __insert_request(struct ceph_mds_client *mdsc,
591 struct ceph_mds_request *new)
592 {
593 struct rb_node **p = &mdsc->request_tree.rb_node;
594 struct rb_node *parent = NULL;
595 struct ceph_mds_request *req = NULL;
596
597 while (*p) {
598 parent = *p;
599 req = rb_entry(parent, struct ceph_mds_request, r_node);
600 if (new->r_tid < req->r_tid)
601 p = &(*p)->rb_left;
602 else if (new->r_tid > req->r_tid)
603 p = &(*p)->rb_right;
604 else
605 BUG();
606 }
607
608 rb_link_node(&new->r_node, parent, p);
609 rb_insert_color(&new->r_node, &mdsc->request_tree);
610 }
611
612 /*
613 * Register an in-flight request, and assign a tid. Link to directory
614 * are modifying (if any).
615 *
616 * Called under mdsc->mutex.
617 */
618 static void __register_request(struct ceph_mds_client *mdsc,
619 struct ceph_mds_request *req,
620 struct inode *dir)
621 {
622 req->r_tid = ++mdsc->last_tid;
623 if (req->r_num_caps)
624 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
625 req->r_num_caps);
626 dout("__register_request %p tid %lld\n", req, req->r_tid);
627 ceph_mdsc_get_request(req);
628 __insert_request(mdsc, req);
629
630 req->r_uid = current_fsuid();
631 req->r_gid = current_fsgid();
632
633 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
634 mdsc->oldest_tid = req->r_tid;
635
636 if (dir) {
637 ihold(dir);
638 req->r_unsafe_dir = dir;
639 }
640 }
641
642 static void __unregister_request(struct ceph_mds_client *mdsc,
643 struct ceph_mds_request *req)
644 {
645 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
646
647 /* Never leave an unregistered request on an unsafe list! */
648 list_del_init(&req->r_unsafe_item);
649
650 if (req->r_tid == mdsc->oldest_tid) {
651 struct rb_node *p = rb_next(&req->r_node);
652 mdsc->oldest_tid = 0;
653 while (p) {
654 struct ceph_mds_request *next_req =
655 rb_entry(p, struct ceph_mds_request, r_node);
656 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
657 mdsc->oldest_tid = next_req->r_tid;
658 break;
659 }
660 p = rb_next(p);
661 }
662 }
663
664 rb_erase(&req->r_node, &mdsc->request_tree);
665 RB_CLEAR_NODE(&req->r_node);
666
667 if (req->r_unsafe_dir && req->r_got_unsafe) {
668 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
669 spin_lock(&ci->i_unsafe_lock);
670 list_del_init(&req->r_unsafe_dir_item);
671 spin_unlock(&ci->i_unsafe_lock);
672 }
673 if (req->r_target_inode && req->r_got_unsafe) {
674 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
675 spin_lock(&ci->i_unsafe_lock);
676 list_del_init(&req->r_unsafe_target_item);
677 spin_unlock(&ci->i_unsafe_lock);
678 }
679
680 if (req->r_unsafe_dir) {
681 iput(req->r_unsafe_dir);
682 req->r_unsafe_dir = NULL;
683 }
684
685 complete_all(&req->r_safe_completion);
686
687 ceph_mdsc_put_request(req);
688 }
689
690 /*
691 * Choose mds to send request to next. If there is a hint set in the
692 * request (e.g., due to a prior forward hint from the mds), use that.
693 * Otherwise, consult frag tree and/or caps to identify the
694 * appropriate mds. If all else fails, choose randomly.
695 *
696 * Called under mdsc->mutex.
697 */
698 static struct dentry *get_nonsnap_parent(struct dentry *dentry)
699 {
700 /*
701 * we don't need to worry about protecting the d_parent access
702 * here because we never renaming inside the snapped namespace
703 * except to resplice to another snapdir, and either the old or new
704 * result is a valid result.
705 */
706 while (!IS_ROOT(dentry) && ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
707 dentry = dentry->d_parent;
708 return dentry;
709 }
710
711 static int __choose_mds(struct ceph_mds_client *mdsc,
712 struct ceph_mds_request *req)
713 {
714 struct inode *inode;
715 struct ceph_inode_info *ci;
716 struct ceph_cap *cap;
717 int mode = req->r_direct_mode;
718 int mds = -1;
719 u32 hash = req->r_direct_hash;
720 bool is_hash = req->r_direct_is_hash;
721
722 /*
723 * is there a specific mds we should try? ignore hint if we have
724 * no session and the mds is not up (active or recovering).
725 */
726 if (req->r_resend_mds >= 0 &&
727 (__have_session(mdsc, req->r_resend_mds) ||
728 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
729 dout("choose_mds using resend_mds mds%d\n",
730 req->r_resend_mds);
731 return req->r_resend_mds;
732 }
733
734 if (mode == USE_RANDOM_MDS)
735 goto random;
736
737 inode = NULL;
738 if (req->r_inode) {
739 inode = req->r_inode;
740 } else if (req->r_dentry) {
741 /* ignore race with rename; old or new d_parent is okay */
742 struct dentry *parent = req->r_dentry->d_parent;
743 struct inode *dir = d_inode(parent);
744
745 if (dir->i_sb != mdsc->fsc->sb) {
746 /* not this fs! */
747 inode = d_inode(req->r_dentry);
748 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
749 /* direct snapped/virtual snapdir requests
750 * based on parent dir inode */
751 struct dentry *dn = get_nonsnap_parent(parent);
752 inode = d_inode(dn);
753 dout("__choose_mds using nonsnap parent %p\n", inode);
754 } else {
755 /* dentry target */
756 inode = d_inode(req->r_dentry);
757 if (!inode || mode == USE_AUTH_MDS) {
758 /* dir + name */
759 inode = dir;
760 hash = ceph_dentry_hash(dir, req->r_dentry);
761 is_hash = true;
762 }
763 }
764 }
765
766 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
767 (int)hash, mode);
768 if (!inode)
769 goto random;
770 ci = ceph_inode(inode);
771
772 if (is_hash && S_ISDIR(inode->i_mode)) {
773 struct ceph_inode_frag frag;
774 int found;
775
776 ceph_choose_frag(ci, hash, &frag, &found);
777 if (found) {
778 if (mode == USE_ANY_MDS && frag.ndist > 0) {
779 u8 r;
780
781 /* choose a random replica */
782 get_random_bytes(&r, 1);
783 r %= frag.ndist;
784 mds = frag.dist[r];
785 dout("choose_mds %p %llx.%llx "
786 "frag %u mds%d (%d/%d)\n",
787 inode, ceph_vinop(inode),
788 frag.frag, mds,
789 (int)r, frag.ndist);
790 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
791 CEPH_MDS_STATE_ACTIVE)
792 return mds;
793 }
794
795 /* since this file/dir wasn't known to be
796 * replicated, then we want to look for the
797 * authoritative mds. */
798 mode = USE_AUTH_MDS;
799 if (frag.mds >= 0) {
800 /* choose auth mds */
801 mds = frag.mds;
802 dout("choose_mds %p %llx.%llx "
803 "frag %u mds%d (auth)\n",
804 inode, ceph_vinop(inode), frag.frag, mds);
805 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
806 CEPH_MDS_STATE_ACTIVE)
807 return mds;
808 }
809 }
810 }
811
812 spin_lock(&ci->i_ceph_lock);
813 cap = NULL;
814 if (mode == USE_AUTH_MDS)
815 cap = ci->i_auth_cap;
816 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
817 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
818 if (!cap) {
819 spin_unlock(&ci->i_ceph_lock);
820 goto random;
821 }
822 mds = cap->session->s_mds;
823 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
824 inode, ceph_vinop(inode), mds,
825 cap == ci->i_auth_cap ? "auth " : "", cap);
826 spin_unlock(&ci->i_ceph_lock);
827 return mds;
828
829 random:
830 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
831 dout("choose_mds chose random mds%d\n", mds);
832 return mds;
833 }
834
835
836 /*
837 * session messages
838 */
839 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
840 {
841 struct ceph_msg *msg;
842 struct ceph_mds_session_head *h;
843
844 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
845 false);
846 if (!msg) {
847 pr_err("create_session_msg ENOMEM creating msg\n");
848 return NULL;
849 }
850 h = msg->front.iov_base;
851 h->op = cpu_to_le32(op);
852 h->seq = cpu_to_le64(seq);
853
854 return msg;
855 }
856
857 /*
858 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
859 * to include additional client metadata fields.
860 */
861 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
862 {
863 struct ceph_msg *msg;
864 struct ceph_mds_session_head *h;
865 int i = -1;
866 int metadata_bytes = 0;
867 int metadata_key_count = 0;
868 struct ceph_options *opt = mdsc->fsc->client->options;
869 void *p;
870
871 const char* metadata[][2] = {
872 {"hostname", utsname()->nodename},
873 {"kernel_version", utsname()->release},
874 {"entity_id", opt->name ? opt->name : ""},
875 {NULL, NULL}
876 };
877
878 /* Calculate serialized length of metadata */
879 metadata_bytes = 4; /* map length */
880 for (i = 0; metadata[i][0] != NULL; ++i) {
881 metadata_bytes += 8 + strlen(metadata[i][0]) +
882 strlen(metadata[i][1]);
883 metadata_key_count++;
884 }
885
886 /* Allocate the message */
887 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
888 GFP_NOFS, false);
889 if (!msg) {
890 pr_err("create_session_msg ENOMEM creating msg\n");
891 return NULL;
892 }
893 h = msg->front.iov_base;
894 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
895 h->seq = cpu_to_le64(seq);
896
897 /*
898 * Serialize client metadata into waiting buffer space, using
899 * the format that userspace expects for map<string, string>
900 *
901 * ClientSession messages with metadata are v2
902 */
903 msg->hdr.version = cpu_to_le16(2);
904 msg->hdr.compat_version = cpu_to_le16(1);
905
906 /* The write pointer, following the session_head structure */
907 p = msg->front.iov_base + sizeof(*h);
908
909 /* Number of entries in the map */
910 ceph_encode_32(&p, metadata_key_count);
911
912 /* Two length-prefixed strings for each entry in the map */
913 for (i = 0; metadata[i][0] != NULL; ++i) {
914 size_t const key_len = strlen(metadata[i][0]);
915 size_t const val_len = strlen(metadata[i][1]);
916
917 ceph_encode_32(&p, key_len);
918 memcpy(p, metadata[i][0], key_len);
919 p += key_len;
920 ceph_encode_32(&p, val_len);
921 memcpy(p, metadata[i][1], val_len);
922 p += val_len;
923 }
924
925 return msg;
926 }
927
928 /*
929 * send session open request.
930 *
931 * called under mdsc->mutex
932 */
933 static int __open_session(struct ceph_mds_client *mdsc,
934 struct ceph_mds_session *session)
935 {
936 struct ceph_msg *msg;
937 int mstate;
938 int mds = session->s_mds;
939
940 /* wait for mds to go active? */
941 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
942 dout("open_session to mds%d (%s)\n", mds,
943 ceph_mds_state_name(mstate));
944 session->s_state = CEPH_MDS_SESSION_OPENING;
945 session->s_renew_requested = jiffies;
946
947 /* send connect message */
948 msg = create_session_open_msg(mdsc, session->s_seq);
949 if (!msg)
950 return -ENOMEM;
951 ceph_con_send(&session->s_con, msg);
952 return 0;
953 }
954
955 /*
956 * open sessions for any export targets for the given mds
957 *
958 * called under mdsc->mutex
959 */
960 static struct ceph_mds_session *
961 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
962 {
963 struct ceph_mds_session *session;
964
965 session = __ceph_lookup_mds_session(mdsc, target);
966 if (!session) {
967 session = register_session(mdsc, target);
968 if (IS_ERR(session))
969 return session;
970 }
971 if (session->s_state == CEPH_MDS_SESSION_NEW ||
972 session->s_state == CEPH_MDS_SESSION_CLOSING)
973 __open_session(mdsc, session);
974
975 return session;
976 }
977
978 struct ceph_mds_session *
979 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
980 {
981 struct ceph_mds_session *session;
982
983 dout("open_export_target_session to mds%d\n", target);
984
985 mutex_lock(&mdsc->mutex);
986 session = __open_export_target_session(mdsc, target);
987 mutex_unlock(&mdsc->mutex);
988
989 return session;
990 }
991
992 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
993 struct ceph_mds_session *session)
994 {
995 struct ceph_mds_info *mi;
996 struct ceph_mds_session *ts;
997 int i, mds = session->s_mds;
998
999 if (mds >= mdsc->mdsmap->m_max_mds)
1000 return;
1001
1002 mi = &mdsc->mdsmap->m_info[mds];
1003 dout("open_export_target_sessions for mds%d (%d targets)\n",
1004 session->s_mds, mi->num_export_targets);
1005
1006 for (i = 0; i < mi->num_export_targets; i++) {
1007 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1008 if (!IS_ERR(ts))
1009 ceph_put_mds_session(ts);
1010 }
1011 }
1012
1013 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1014 struct ceph_mds_session *session)
1015 {
1016 mutex_lock(&mdsc->mutex);
1017 __open_export_target_sessions(mdsc, session);
1018 mutex_unlock(&mdsc->mutex);
1019 }
1020
1021 /*
1022 * session caps
1023 */
1024
1025 /* caller holds s_cap_lock, we drop it */
1026 static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
1027 struct ceph_mds_session *session)
1028 __releases(session->s_cap_lock)
1029 {
1030 LIST_HEAD(tmp_list);
1031 list_splice_init(&session->s_cap_releases, &tmp_list);
1032 session->s_num_cap_releases = 0;
1033 spin_unlock(&session->s_cap_lock);
1034
1035 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1036 while (!list_empty(&tmp_list)) {
1037 struct ceph_cap *cap;
1038 /* zero out the in-progress message */
1039 cap = list_first_entry(&tmp_list,
1040 struct ceph_cap, session_caps);
1041 list_del(&cap->session_caps);
1042 ceph_put_cap(mdsc, cap);
1043 }
1044 }
1045
1046 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1047 struct ceph_mds_session *session)
1048 {
1049 struct ceph_mds_request *req;
1050 struct rb_node *p;
1051
1052 dout("cleanup_session_requests mds%d\n", session->s_mds);
1053 mutex_lock(&mdsc->mutex);
1054 while (!list_empty(&session->s_unsafe)) {
1055 req = list_first_entry(&session->s_unsafe,
1056 struct ceph_mds_request, r_unsafe_item);
1057 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1058 req->r_tid);
1059 __unregister_request(mdsc, req);
1060 }
1061 /* zero r_attempts, so kick_requests() will re-send requests */
1062 p = rb_first(&mdsc->request_tree);
1063 while (p) {
1064 req = rb_entry(p, struct ceph_mds_request, r_node);
1065 p = rb_next(p);
1066 if (req->r_session &&
1067 req->r_session->s_mds == session->s_mds)
1068 req->r_attempts = 0;
1069 }
1070 mutex_unlock(&mdsc->mutex);
1071 }
1072
1073 /*
1074 * Helper to safely iterate over all caps associated with a session, with
1075 * special care taken to handle a racing __ceph_remove_cap().
1076 *
1077 * Caller must hold session s_mutex.
1078 */
1079 static int iterate_session_caps(struct ceph_mds_session *session,
1080 int (*cb)(struct inode *, struct ceph_cap *,
1081 void *), void *arg)
1082 {
1083 struct list_head *p;
1084 struct ceph_cap *cap;
1085 struct inode *inode, *last_inode = NULL;
1086 struct ceph_cap *old_cap = NULL;
1087 int ret;
1088
1089 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1090 spin_lock(&session->s_cap_lock);
1091 p = session->s_caps.next;
1092 while (p != &session->s_caps) {
1093 cap = list_entry(p, struct ceph_cap, session_caps);
1094 inode = igrab(&cap->ci->vfs_inode);
1095 if (!inode) {
1096 p = p->next;
1097 continue;
1098 }
1099 session->s_cap_iterator = cap;
1100 spin_unlock(&session->s_cap_lock);
1101
1102 if (last_inode) {
1103 iput(last_inode);
1104 last_inode = NULL;
1105 }
1106 if (old_cap) {
1107 ceph_put_cap(session->s_mdsc, old_cap);
1108 old_cap = NULL;
1109 }
1110
1111 ret = cb(inode, cap, arg);
1112 last_inode = inode;
1113
1114 spin_lock(&session->s_cap_lock);
1115 p = p->next;
1116 if (cap->ci == NULL) {
1117 dout("iterate_session_caps finishing cap %p removal\n",
1118 cap);
1119 BUG_ON(cap->session != session);
1120 cap->session = NULL;
1121 list_del_init(&cap->session_caps);
1122 session->s_nr_caps--;
1123 if (cap->queue_release) {
1124 list_add_tail(&cap->session_caps,
1125 &session->s_cap_releases);
1126 session->s_num_cap_releases++;
1127 } else {
1128 old_cap = cap; /* put_cap it w/o locks held */
1129 }
1130 }
1131 if (ret < 0)
1132 goto out;
1133 }
1134 ret = 0;
1135 out:
1136 session->s_cap_iterator = NULL;
1137 spin_unlock(&session->s_cap_lock);
1138
1139 iput(last_inode);
1140 if (old_cap)
1141 ceph_put_cap(session->s_mdsc, old_cap);
1142
1143 return ret;
1144 }
1145
1146 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1147 void *arg)
1148 {
1149 struct ceph_inode_info *ci = ceph_inode(inode);
1150 LIST_HEAD(to_remove);
1151 int drop = 0;
1152
1153 dout("removing cap %p, ci is %p, inode is %p\n",
1154 cap, ci, &ci->vfs_inode);
1155 spin_lock(&ci->i_ceph_lock);
1156 __ceph_remove_cap(cap, false);
1157 if (!ci->i_auth_cap) {
1158 struct ceph_cap_flush *cf;
1159 struct ceph_mds_client *mdsc =
1160 ceph_sb_to_client(inode->i_sb)->mdsc;
1161
1162 while (true) {
1163 struct rb_node *n = rb_first(&ci->i_cap_flush_tree);
1164 if (!n)
1165 break;
1166 cf = rb_entry(n, struct ceph_cap_flush, i_node);
1167 rb_erase(&cf->i_node, &ci->i_cap_flush_tree);
1168 list_add(&cf->list, &to_remove);
1169 }
1170
1171 spin_lock(&mdsc->cap_dirty_lock);
1172
1173 list_for_each_entry(cf, &to_remove, list)
1174 rb_erase(&cf->g_node, &mdsc->cap_flush_tree);
1175
1176 if (!list_empty(&ci->i_dirty_item)) {
1177 pr_warn_ratelimited(
1178 " dropping dirty %s state for %p %lld\n",
1179 ceph_cap_string(ci->i_dirty_caps),
1180 inode, ceph_ino(inode));
1181 ci->i_dirty_caps = 0;
1182 list_del_init(&ci->i_dirty_item);
1183 drop = 1;
1184 }
1185 if (!list_empty(&ci->i_flushing_item)) {
1186 pr_warn_ratelimited(
1187 " dropping dirty+flushing %s state for %p %lld\n",
1188 ceph_cap_string(ci->i_flushing_caps),
1189 inode, ceph_ino(inode));
1190 ci->i_flushing_caps = 0;
1191 list_del_init(&ci->i_flushing_item);
1192 mdsc->num_cap_flushing--;
1193 drop = 1;
1194 }
1195 spin_unlock(&mdsc->cap_dirty_lock);
1196
1197 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1198 list_add(&ci->i_prealloc_cap_flush->list, &to_remove);
1199 ci->i_prealloc_cap_flush = NULL;
1200 }
1201 }
1202 spin_unlock(&ci->i_ceph_lock);
1203 while (!list_empty(&to_remove)) {
1204 struct ceph_cap_flush *cf;
1205 cf = list_first_entry(&to_remove,
1206 struct ceph_cap_flush, list);
1207 list_del(&cf->list);
1208 ceph_free_cap_flush(cf);
1209 }
1210 while (drop--)
1211 iput(inode);
1212 return 0;
1213 }
1214
1215 /*
1216 * caller must hold session s_mutex
1217 */
1218 static void remove_session_caps(struct ceph_mds_session *session)
1219 {
1220 dout("remove_session_caps on %p\n", session);
1221 iterate_session_caps(session, remove_session_caps_cb, NULL);
1222
1223 spin_lock(&session->s_cap_lock);
1224 if (session->s_nr_caps > 0) {
1225 struct super_block *sb = session->s_mdsc->fsc->sb;
1226 struct inode *inode;
1227 struct ceph_cap *cap, *prev = NULL;
1228 struct ceph_vino vino;
1229 /*
1230 * iterate_session_caps() skips inodes that are being
1231 * deleted, we need to wait until deletions are complete.
1232 * __wait_on_freeing_inode() is designed for the job,
1233 * but it is not exported, so use lookup inode function
1234 * to access it.
1235 */
1236 while (!list_empty(&session->s_caps)) {
1237 cap = list_entry(session->s_caps.next,
1238 struct ceph_cap, session_caps);
1239 if (cap == prev)
1240 break;
1241 prev = cap;
1242 vino = cap->ci->i_vino;
1243 spin_unlock(&session->s_cap_lock);
1244
1245 inode = ceph_find_inode(sb, vino);
1246 iput(inode);
1247
1248 spin_lock(&session->s_cap_lock);
1249 }
1250 }
1251
1252 // drop cap expires and unlock s_cap_lock
1253 cleanup_cap_releases(session->s_mdsc, session);
1254
1255 BUG_ON(session->s_nr_caps > 0);
1256 BUG_ON(!list_empty(&session->s_cap_flushing));
1257 }
1258
1259 /*
1260 * wake up any threads waiting on this session's caps. if the cap is
1261 * old (didn't get renewed on the client reconnect), remove it now.
1262 *
1263 * caller must hold s_mutex.
1264 */
1265 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1266 void *arg)
1267 {
1268 struct ceph_inode_info *ci = ceph_inode(inode);
1269
1270 wake_up_all(&ci->i_cap_wq);
1271 if (arg) {
1272 spin_lock(&ci->i_ceph_lock);
1273 ci->i_wanted_max_size = 0;
1274 ci->i_requested_max_size = 0;
1275 spin_unlock(&ci->i_ceph_lock);
1276 }
1277 return 0;
1278 }
1279
1280 static void wake_up_session_caps(struct ceph_mds_session *session,
1281 int reconnect)
1282 {
1283 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1284 iterate_session_caps(session, wake_up_session_cb,
1285 (void *)(unsigned long)reconnect);
1286 }
1287
1288 /*
1289 * Send periodic message to MDS renewing all currently held caps. The
1290 * ack will reset the expiration for all caps from this session.
1291 *
1292 * caller holds s_mutex
1293 */
1294 static int send_renew_caps(struct ceph_mds_client *mdsc,
1295 struct ceph_mds_session *session)
1296 {
1297 struct ceph_msg *msg;
1298 int state;
1299
1300 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1301 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1302 pr_info("mds%d caps stale\n", session->s_mds);
1303 session->s_renew_requested = jiffies;
1304
1305 /* do not try to renew caps until a recovering mds has reconnected
1306 * with its clients. */
1307 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1308 if (state < CEPH_MDS_STATE_RECONNECT) {
1309 dout("send_renew_caps ignoring mds%d (%s)\n",
1310 session->s_mds, ceph_mds_state_name(state));
1311 return 0;
1312 }
1313
1314 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1315 ceph_mds_state_name(state));
1316 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1317 ++session->s_renew_seq);
1318 if (!msg)
1319 return -ENOMEM;
1320 ceph_con_send(&session->s_con, msg);
1321 return 0;
1322 }
1323
1324 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1325 struct ceph_mds_session *session, u64 seq)
1326 {
1327 struct ceph_msg *msg;
1328
1329 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1330 session->s_mds, ceph_session_state_name(session->s_state), seq);
1331 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1332 if (!msg)
1333 return -ENOMEM;
1334 ceph_con_send(&session->s_con, msg);
1335 return 0;
1336 }
1337
1338
1339 /*
1340 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1341 *
1342 * Called under session->s_mutex
1343 */
1344 static void renewed_caps(struct ceph_mds_client *mdsc,
1345 struct ceph_mds_session *session, int is_renew)
1346 {
1347 int was_stale;
1348 int wake = 0;
1349
1350 spin_lock(&session->s_cap_lock);
1351 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1352
1353 session->s_cap_ttl = session->s_renew_requested +
1354 mdsc->mdsmap->m_session_timeout*HZ;
1355
1356 if (was_stale) {
1357 if (time_before(jiffies, session->s_cap_ttl)) {
1358 pr_info("mds%d caps renewed\n", session->s_mds);
1359 wake = 1;
1360 } else {
1361 pr_info("mds%d caps still stale\n", session->s_mds);
1362 }
1363 }
1364 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1365 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1366 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1367 spin_unlock(&session->s_cap_lock);
1368
1369 if (wake)
1370 wake_up_session_caps(session, 0);
1371 }
1372
1373 /*
1374 * send a session close request
1375 */
1376 static int request_close_session(struct ceph_mds_client *mdsc,
1377 struct ceph_mds_session *session)
1378 {
1379 struct ceph_msg *msg;
1380
1381 dout("request_close_session mds%d state %s seq %lld\n",
1382 session->s_mds, ceph_session_state_name(session->s_state),
1383 session->s_seq);
1384 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1385 if (!msg)
1386 return -ENOMEM;
1387 ceph_con_send(&session->s_con, msg);
1388 return 0;
1389 }
1390
1391 /*
1392 * Called with s_mutex held.
1393 */
1394 static int __close_session(struct ceph_mds_client *mdsc,
1395 struct ceph_mds_session *session)
1396 {
1397 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1398 return 0;
1399 session->s_state = CEPH_MDS_SESSION_CLOSING;
1400 return request_close_session(mdsc, session);
1401 }
1402
1403 /*
1404 * Trim old(er) caps.
1405 *
1406 * Because we can't cache an inode without one or more caps, we do
1407 * this indirectly: if a cap is unused, we prune its aliases, at which
1408 * point the inode will hopefully get dropped to.
1409 *
1410 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1411 * memory pressure from the MDS, though, so it needn't be perfect.
1412 */
1413 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1414 {
1415 struct ceph_mds_session *session = arg;
1416 struct ceph_inode_info *ci = ceph_inode(inode);
1417 int used, wanted, oissued, mine;
1418
1419 if (session->s_trim_caps <= 0)
1420 return -1;
1421
1422 spin_lock(&ci->i_ceph_lock);
1423 mine = cap->issued | cap->implemented;
1424 used = __ceph_caps_used(ci);
1425 wanted = __ceph_caps_file_wanted(ci);
1426 oissued = __ceph_caps_issued_other(ci, cap);
1427
1428 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1429 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1430 ceph_cap_string(used), ceph_cap_string(wanted));
1431 if (cap == ci->i_auth_cap) {
1432 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1433 !list_empty(&ci->i_cap_snaps))
1434 goto out;
1435 if ((used | wanted) & CEPH_CAP_ANY_WR)
1436 goto out;
1437 }
1438 /* The inode has cached pages, but it's no longer used.
1439 * we can safely drop it */
1440 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1441 !(oissued & CEPH_CAP_FILE_CACHE)) {
1442 used = 0;
1443 oissued = 0;
1444 }
1445 if ((used | wanted) & ~oissued & mine)
1446 goto out; /* we need these caps */
1447
1448 session->s_trim_caps--;
1449 if (oissued) {
1450 /* we aren't the only cap.. just remove us */
1451 __ceph_remove_cap(cap, true);
1452 } else {
1453 /* try dropping referring dentries */
1454 spin_unlock(&ci->i_ceph_lock);
1455 d_prune_aliases(inode);
1456 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1457 inode, cap, atomic_read(&inode->i_count));
1458 return 0;
1459 }
1460
1461 out:
1462 spin_unlock(&ci->i_ceph_lock);
1463 return 0;
1464 }
1465
1466 /*
1467 * Trim session cap count down to some max number.
1468 */
1469 static int trim_caps(struct ceph_mds_client *mdsc,
1470 struct ceph_mds_session *session,
1471 int max_caps)
1472 {
1473 int trim_caps = session->s_nr_caps - max_caps;
1474
1475 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1476 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1477 if (trim_caps > 0) {
1478 session->s_trim_caps = trim_caps;
1479 iterate_session_caps(session, trim_caps_cb, session);
1480 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1481 session->s_mds, session->s_nr_caps, max_caps,
1482 trim_caps - session->s_trim_caps);
1483 session->s_trim_caps = 0;
1484 }
1485
1486 ceph_send_cap_releases(mdsc, session);
1487 return 0;
1488 }
1489
1490 static int check_capsnap_flush(struct ceph_inode_info *ci,
1491 u64 want_snap_seq)
1492 {
1493 int ret = 1;
1494 spin_lock(&ci->i_ceph_lock);
1495 if (want_snap_seq > 0 && !list_empty(&ci->i_cap_snaps)) {
1496 struct ceph_cap_snap *capsnap =
1497 list_first_entry(&ci->i_cap_snaps,
1498 struct ceph_cap_snap, ci_item);
1499 ret = capsnap->follows >= want_snap_seq;
1500 }
1501 spin_unlock(&ci->i_ceph_lock);
1502 return ret;
1503 }
1504
1505 static int check_caps_flush(struct ceph_mds_client *mdsc,
1506 u64 want_flush_tid)
1507 {
1508 struct rb_node *n;
1509 struct ceph_cap_flush *cf;
1510 int ret = 1;
1511
1512 spin_lock(&mdsc->cap_dirty_lock);
1513 n = rb_first(&mdsc->cap_flush_tree);
1514 cf = n ? rb_entry(n, struct ceph_cap_flush, g_node) : NULL;
1515 if (cf && cf->tid <= want_flush_tid) {
1516 dout("check_caps_flush still flushing tid %llu <= %llu\n",
1517 cf->tid, want_flush_tid);
1518 ret = 0;
1519 }
1520 spin_unlock(&mdsc->cap_dirty_lock);
1521 return ret;
1522 }
1523
1524 /*
1525 * flush all dirty inode data to disk.
1526 *
1527 * returns true if we've flushed through want_flush_tid
1528 */
1529 static void wait_caps_flush(struct ceph_mds_client *mdsc,
1530 u64 want_flush_tid, u64 want_snap_seq)
1531 {
1532 int mds;
1533
1534 dout("check_caps_flush want %llu snap want %llu\n",
1535 want_flush_tid, want_snap_seq);
1536 mutex_lock(&mdsc->mutex);
1537 for (mds = 0; mds < mdsc->max_sessions; ) {
1538 struct ceph_mds_session *session = mdsc->sessions[mds];
1539 struct inode *inode = NULL;
1540
1541 if (!session) {
1542 mds++;
1543 continue;
1544 }
1545 get_session(session);
1546 mutex_unlock(&mdsc->mutex);
1547
1548 mutex_lock(&session->s_mutex);
1549 if (!list_empty(&session->s_cap_snaps_flushing)) {
1550 struct ceph_cap_snap *capsnap =
1551 list_first_entry(&session->s_cap_snaps_flushing,
1552 struct ceph_cap_snap,
1553 flushing_item);
1554 struct ceph_inode_info *ci = capsnap->ci;
1555 if (!check_capsnap_flush(ci, want_snap_seq)) {
1556 dout("check_cap_flush still flushing snap %p "
1557 "follows %lld <= %lld to mds%d\n",
1558 &ci->vfs_inode, capsnap->follows,
1559 want_snap_seq, mds);
1560 inode = igrab(&ci->vfs_inode);
1561 }
1562 }
1563 mutex_unlock(&session->s_mutex);
1564 ceph_put_mds_session(session);
1565
1566 if (inode) {
1567 wait_event(mdsc->cap_flushing_wq,
1568 check_capsnap_flush(ceph_inode(inode),
1569 want_snap_seq));
1570 iput(inode);
1571 } else {
1572 mds++;
1573 }
1574
1575 mutex_lock(&mdsc->mutex);
1576 }
1577 mutex_unlock(&mdsc->mutex);
1578
1579 wait_event(mdsc->cap_flushing_wq,
1580 check_caps_flush(mdsc, want_flush_tid));
1581
1582 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
1583 }
1584
1585 /*
1586 * called under s_mutex
1587 */
1588 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1589 struct ceph_mds_session *session)
1590 {
1591 struct ceph_msg *msg = NULL;
1592 struct ceph_mds_cap_release *head;
1593 struct ceph_mds_cap_item *item;
1594 struct ceph_cap *cap;
1595 LIST_HEAD(tmp_list);
1596 int num_cap_releases;
1597
1598 spin_lock(&session->s_cap_lock);
1599 again:
1600 list_splice_init(&session->s_cap_releases, &tmp_list);
1601 num_cap_releases = session->s_num_cap_releases;
1602 session->s_num_cap_releases = 0;
1603 spin_unlock(&session->s_cap_lock);
1604
1605 while (!list_empty(&tmp_list)) {
1606 if (!msg) {
1607 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1608 PAGE_CACHE_SIZE, GFP_NOFS, false);
1609 if (!msg)
1610 goto out_err;
1611 head = msg->front.iov_base;
1612 head->num = cpu_to_le32(0);
1613 msg->front.iov_len = sizeof(*head);
1614 }
1615 cap = list_first_entry(&tmp_list, struct ceph_cap,
1616 session_caps);
1617 list_del(&cap->session_caps);
1618 num_cap_releases--;
1619
1620 head = msg->front.iov_base;
1621 le32_add_cpu(&head->num, 1);
1622 item = msg->front.iov_base + msg->front.iov_len;
1623 item->ino = cpu_to_le64(cap->cap_ino);
1624 item->cap_id = cpu_to_le64(cap->cap_id);
1625 item->migrate_seq = cpu_to_le32(cap->mseq);
1626 item->seq = cpu_to_le32(cap->issue_seq);
1627 msg->front.iov_len += sizeof(*item);
1628
1629 ceph_put_cap(mdsc, cap);
1630
1631 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1632 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1633 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1634 ceph_con_send(&session->s_con, msg);
1635 msg = NULL;
1636 }
1637 }
1638
1639 BUG_ON(num_cap_releases != 0);
1640
1641 spin_lock(&session->s_cap_lock);
1642 if (!list_empty(&session->s_cap_releases))
1643 goto again;
1644 spin_unlock(&session->s_cap_lock);
1645
1646 if (msg) {
1647 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1648 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1649 ceph_con_send(&session->s_con, msg);
1650 }
1651 return;
1652 out_err:
1653 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1654 session->s_mds);
1655 spin_lock(&session->s_cap_lock);
1656 list_splice(&tmp_list, &session->s_cap_releases);
1657 session->s_num_cap_releases += num_cap_releases;
1658 spin_unlock(&session->s_cap_lock);
1659 }
1660
1661 /*
1662 * requests
1663 */
1664
1665 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1666 struct inode *dir)
1667 {
1668 struct ceph_inode_info *ci = ceph_inode(dir);
1669 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1670 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1671 size_t size = sizeof(*rinfo->dir_in) + sizeof(*rinfo->dir_dname_len) +
1672 sizeof(*rinfo->dir_dname) + sizeof(*rinfo->dir_dlease);
1673 int order, num_entries;
1674
1675 spin_lock(&ci->i_ceph_lock);
1676 num_entries = ci->i_files + ci->i_subdirs;
1677 spin_unlock(&ci->i_ceph_lock);
1678 num_entries = max(num_entries, 1);
1679 num_entries = min(num_entries, opt->max_readdir);
1680
1681 order = get_order(size * num_entries);
1682 while (order >= 0) {
1683 rinfo->dir_in = (void*)__get_free_pages(GFP_KERNEL |
1684 __GFP_NOWARN,
1685 order);
1686 if (rinfo->dir_in)
1687 break;
1688 order--;
1689 }
1690 if (!rinfo->dir_in)
1691 return -ENOMEM;
1692
1693 num_entries = (PAGE_SIZE << order) / size;
1694 num_entries = min(num_entries, opt->max_readdir);
1695
1696 rinfo->dir_buf_size = PAGE_SIZE << order;
1697 req->r_num_caps = num_entries + 1;
1698 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1699 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1700 return 0;
1701 }
1702
1703 /*
1704 * Create an mds request.
1705 */
1706 struct ceph_mds_request *
1707 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1708 {
1709 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1710
1711 if (!req)
1712 return ERR_PTR(-ENOMEM);
1713
1714 mutex_init(&req->r_fill_mutex);
1715 req->r_mdsc = mdsc;
1716 req->r_started = jiffies;
1717 req->r_resend_mds = -1;
1718 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1719 INIT_LIST_HEAD(&req->r_unsafe_target_item);
1720 req->r_fmode = -1;
1721 kref_init(&req->r_kref);
1722 INIT_LIST_HEAD(&req->r_wait);
1723 init_completion(&req->r_completion);
1724 init_completion(&req->r_safe_completion);
1725 INIT_LIST_HEAD(&req->r_unsafe_item);
1726
1727 req->r_stamp = CURRENT_TIME;
1728
1729 req->r_op = op;
1730 req->r_direct_mode = mode;
1731 return req;
1732 }
1733
1734 /*
1735 * return oldest (lowest) request, tid in request tree, 0 if none.
1736 *
1737 * called under mdsc->mutex.
1738 */
1739 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1740 {
1741 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1742 return NULL;
1743 return rb_entry(rb_first(&mdsc->request_tree),
1744 struct ceph_mds_request, r_node);
1745 }
1746
1747 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1748 {
1749 return mdsc->oldest_tid;
1750 }
1751
1752 /*
1753 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1754 * on build_path_from_dentry in fs/cifs/dir.c.
1755 *
1756 * If @stop_on_nosnap, generate path relative to the first non-snapped
1757 * inode.
1758 *
1759 * Encode hidden .snap dirs as a double /, i.e.
1760 * foo/.snap/bar -> foo//bar
1761 */
1762 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1763 int stop_on_nosnap)
1764 {
1765 struct dentry *temp;
1766 char *path;
1767 int len, pos;
1768 unsigned seq;
1769
1770 if (dentry == NULL)
1771 return ERR_PTR(-EINVAL);
1772
1773 retry:
1774 len = 0;
1775 seq = read_seqbegin(&rename_lock);
1776 rcu_read_lock();
1777 for (temp = dentry; !IS_ROOT(temp);) {
1778 struct inode *inode = d_inode(temp);
1779 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1780 len++; /* slash only */
1781 else if (stop_on_nosnap && inode &&
1782 ceph_snap(inode) == CEPH_NOSNAP)
1783 break;
1784 else
1785 len += 1 + temp->d_name.len;
1786 temp = temp->d_parent;
1787 }
1788 rcu_read_unlock();
1789 if (len)
1790 len--; /* no leading '/' */
1791
1792 path = kmalloc(len+1, GFP_NOFS);
1793 if (path == NULL)
1794 return ERR_PTR(-ENOMEM);
1795 pos = len;
1796 path[pos] = 0; /* trailing null */
1797 rcu_read_lock();
1798 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1799 struct inode *inode;
1800
1801 spin_lock(&temp->d_lock);
1802 inode = d_inode(temp);
1803 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1804 dout("build_path path+%d: %p SNAPDIR\n",
1805 pos, temp);
1806 } else if (stop_on_nosnap && inode &&
1807 ceph_snap(inode) == CEPH_NOSNAP) {
1808 spin_unlock(&temp->d_lock);
1809 break;
1810 } else {
1811 pos -= temp->d_name.len;
1812 if (pos < 0) {
1813 spin_unlock(&temp->d_lock);
1814 break;
1815 }
1816 strncpy(path + pos, temp->d_name.name,
1817 temp->d_name.len);
1818 }
1819 spin_unlock(&temp->d_lock);
1820 if (pos)
1821 path[--pos] = '/';
1822 temp = temp->d_parent;
1823 }
1824 rcu_read_unlock();
1825 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1826 pr_err("build_path did not end path lookup where "
1827 "expected, namelen is %d, pos is %d\n", len, pos);
1828 /* presumably this is only possible if racing with a
1829 rename of one of the parent directories (we can not
1830 lock the dentries above us to prevent this, but
1831 retrying should be harmless) */
1832 kfree(path);
1833 goto retry;
1834 }
1835
1836 *base = ceph_ino(d_inode(temp));
1837 *plen = len;
1838 dout("build_path on %p %d built %llx '%.*s'\n",
1839 dentry, d_count(dentry), *base, len, path);
1840 return path;
1841 }
1842
1843 static int build_dentry_path(struct dentry *dentry,
1844 const char **ppath, int *ppathlen, u64 *pino,
1845 int *pfreepath)
1846 {
1847 char *path;
1848
1849 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) {
1850 *pino = ceph_ino(d_inode(dentry->d_parent));
1851 *ppath = dentry->d_name.name;
1852 *ppathlen = dentry->d_name.len;
1853 return 0;
1854 }
1855 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1856 if (IS_ERR(path))
1857 return PTR_ERR(path);
1858 *ppath = path;
1859 *pfreepath = 1;
1860 return 0;
1861 }
1862
1863 static int build_inode_path(struct inode *inode,
1864 const char **ppath, int *ppathlen, u64 *pino,
1865 int *pfreepath)
1866 {
1867 struct dentry *dentry;
1868 char *path;
1869
1870 if (ceph_snap(inode) == CEPH_NOSNAP) {
1871 *pino = ceph_ino(inode);
1872 *ppathlen = 0;
1873 return 0;
1874 }
1875 dentry = d_find_alias(inode);
1876 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1877 dput(dentry);
1878 if (IS_ERR(path))
1879 return PTR_ERR(path);
1880 *ppath = path;
1881 *pfreepath = 1;
1882 return 0;
1883 }
1884
1885 /*
1886 * request arguments may be specified via an inode *, a dentry *, or
1887 * an explicit ino+path.
1888 */
1889 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1890 const char *rpath, u64 rino,
1891 const char **ppath, int *pathlen,
1892 u64 *ino, int *freepath)
1893 {
1894 int r = 0;
1895
1896 if (rinode) {
1897 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1898 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1899 ceph_snap(rinode));
1900 } else if (rdentry) {
1901 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1902 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1903 *ppath);
1904 } else if (rpath || rino) {
1905 *ino = rino;
1906 *ppath = rpath;
1907 *pathlen = rpath ? strlen(rpath) : 0;
1908 dout(" path %.*s\n", *pathlen, rpath);
1909 }
1910
1911 return r;
1912 }
1913
1914 /*
1915 * called under mdsc->mutex
1916 */
1917 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1918 struct ceph_mds_request *req,
1919 int mds, bool drop_cap_releases)
1920 {
1921 struct ceph_msg *msg;
1922 struct ceph_mds_request_head *head;
1923 const char *path1 = NULL;
1924 const char *path2 = NULL;
1925 u64 ino1 = 0, ino2 = 0;
1926 int pathlen1 = 0, pathlen2 = 0;
1927 int freepath1 = 0, freepath2 = 0;
1928 int len;
1929 u16 releases;
1930 void *p, *end;
1931 int ret;
1932
1933 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1934 req->r_path1, req->r_ino1.ino,
1935 &path1, &pathlen1, &ino1, &freepath1);
1936 if (ret < 0) {
1937 msg = ERR_PTR(ret);
1938 goto out;
1939 }
1940
1941 ret = set_request_path_attr(NULL, req->r_old_dentry,
1942 req->r_path2, req->r_ino2.ino,
1943 &path2, &pathlen2, &ino2, &freepath2);
1944 if (ret < 0) {
1945 msg = ERR_PTR(ret);
1946 goto out_free1;
1947 }
1948
1949 len = sizeof(*head) +
1950 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
1951 sizeof(struct ceph_timespec);
1952
1953 /* calculate (max) length for cap releases */
1954 len += sizeof(struct ceph_mds_request_release) *
1955 (!!req->r_inode_drop + !!req->r_dentry_drop +
1956 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1957 if (req->r_dentry_drop)
1958 len += req->r_dentry->d_name.len;
1959 if (req->r_old_dentry_drop)
1960 len += req->r_old_dentry->d_name.len;
1961
1962 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1963 if (!msg) {
1964 msg = ERR_PTR(-ENOMEM);
1965 goto out_free2;
1966 }
1967
1968 msg->hdr.version = cpu_to_le16(2);
1969 msg->hdr.tid = cpu_to_le64(req->r_tid);
1970
1971 head = msg->front.iov_base;
1972 p = msg->front.iov_base + sizeof(*head);
1973 end = msg->front.iov_base + msg->front.iov_len;
1974
1975 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1976 head->op = cpu_to_le32(req->r_op);
1977 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1978 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
1979 head->args = req->r_args;
1980
1981 ceph_encode_filepath(&p, end, ino1, path1);
1982 ceph_encode_filepath(&p, end, ino2, path2);
1983
1984 /* make note of release offset, in case we need to replay */
1985 req->r_request_release_offset = p - msg->front.iov_base;
1986
1987 /* cap releases */
1988 releases = 0;
1989 if (req->r_inode_drop)
1990 releases += ceph_encode_inode_release(&p,
1991 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
1992 mds, req->r_inode_drop, req->r_inode_unless, 0);
1993 if (req->r_dentry_drop)
1994 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1995 mds, req->r_dentry_drop, req->r_dentry_unless);
1996 if (req->r_old_dentry_drop)
1997 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1998 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1999 if (req->r_old_inode_drop)
2000 releases += ceph_encode_inode_release(&p,
2001 d_inode(req->r_old_dentry),
2002 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
2003
2004 if (drop_cap_releases) {
2005 releases = 0;
2006 p = msg->front.iov_base + req->r_request_release_offset;
2007 }
2008
2009 head->num_releases = cpu_to_le16(releases);
2010
2011 /* time stamp */
2012 {
2013 struct ceph_timespec ts;
2014 ceph_encode_timespec(&ts, &req->r_stamp);
2015 ceph_encode_copy(&p, &ts, sizeof(ts));
2016 }
2017
2018 BUG_ON(p > end);
2019 msg->front.iov_len = p - msg->front.iov_base;
2020 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2021
2022 if (req->r_pagelist) {
2023 struct ceph_pagelist *pagelist = req->r_pagelist;
2024 atomic_inc(&pagelist->refcnt);
2025 ceph_msg_data_add_pagelist(msg, pagelist);
2026 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2027 } else {
2028 msg->hdr.data_len = 0;
2029 }
2030
2031 msg->hdr.data_off = cpu_to_le16(0);
2032
2033 out_free2:
2034 if (freepath2)
2035 kfree((char *)path2);
2036 out_free1:
2037 if (freepath1)
2038 kfree((char *)path1);
2039 out:
2040 return msg;
2041 }
2042
2043 /*
2044 * called under mdsc->mutex if error, under no mutex if
2045 * success.
2046 */
2047 static void complete_request(struct ceph_mds_client *mdsc,
2048 struct ceph_mds_request *req)
2049 {
2050 if (req->r_callback)
2051 req->r_callback(mdsc, req);
2052 else
2053 complete_all(&req->r_completion);
2054 }
2055
2056 /*
2057 * called under mdsc->mutex
2058 */
2059 static int __prepare_send_request(struct ceph_mds_client *mdsc,
2060 struct ceph_mds_request *req,
2061 int mds, bool drop_cap_releases)
2062 {
2063 struct ceph_mds_request_head *rhead;
2064 struct ceph_msg *msg;
2065 int flags = 0;
2066
2067 req->r_attempts++;
2068 if (req->r_inode) {
2069 struct ceph_cap *cap =
2070 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2071
2072 if (cap)
2073 req->r_sent_on_mseq = cap->mseq;
2074 else
2075 req->r_sent_on_mseq = -1;
2076 }
2077 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2078 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2079
2080 if (req->r_got_unsafe) {
2081 void *p;
2082 /*
2083 * Replay. Do not regenerate message (and rebuild
2084 * paths, etc.); just use the original message.
2085 * Rebuilding paths will break for renames because
2086 * d_move mangles the src name.
2087 */
2088 msg = req->r_request;
2089 rhead = msg->front.iov_base;
2090
2091 flags = le32_to_cpu(rhead->flags);
2092 flags |= CEPH_MDS_FLAG_REPLAY;
2093 rhead->flags = cpu_to_le32(flags);
2094
2095 if (req->r_target_inode)
2096 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2097
2098 rhead->num_retry = req->r_attempts - 1;
2099
2100 /* remove cap/dentry releases from message */
2101 rhead->num_releases = 0;
2102
2103 /* time stamp */
2104 p = msg->front.iov_base + req->r_request_release_offset;
2105 {
2106 struct ceph_timespec ts;
2107 ceph_encode_timespec(&ts, &req->r_stamp);
2108 ceph_encode_copy(&p, &ts, sizeof(ts));
2109 }
2110
2111 msg->front.iov_len = p - msg->front.iov_base;
2112 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2113 return 0;
2114 }
2115
2116 if (req->r_request) {
2117 ceph_msg_put(req->r_request);
2118 req->r_request = NULL;
2119 }
2120 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2121 if (IS_ERR(msg)) {
2122 req->r_err = PTR_ERR(msg);
2123 return PTR_ERR(msg);
2124 }
2125 req->r_request = msg;
2126
2127 rhead = msg->front.iov_base;
2128 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2129 if (req->r_got_unsafe)
2130 flags |= CEPH_MDS_FLAG_REPLAY;
2131 if (req->r_locked_dir)
2132 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2133 rhead->flags = cpu_to_le32(flags);
2134 rhead->num_fwd = req->r_num_fwd;
2135 rhead->num_retry = req->r_attempts - 1;
2136 rhead->ino = 0;
2137
2138 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2139 return 0;
2140 }
2141
2142 /*
2143 * send request, or put it on the appropriate wait list.
2144 */
2145 static int __do_request(struct ceph_mds_client *mdsc,
2146 struct ceph_mds_request *req)
2147 {
2148 struct ceph_mds_session *session = NULL;
2149 int mds = -1;
2150 int err = 0;
2151
2152 if (req->r_err || req->r_got_result) {
2153 if (req->r_aborted)
2154 __unregister_request(mdsc, req);
2155 goto out;
2156 }
2157
2158 if (req->r_timeout &&
2159 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2160 dout("do_request timed out\n");
2161 err = -EIO;
2162 goto finish;
2163 }
2164 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2165 dout("do_request forced umount\n");
2166 err = -EIO;
2167 goto finish;
2168 }
2169
2170 put_request_session(req);
2171
2172 mds = __choose_mds(mdsc, req);
2173 if (mds < 0 ||
2174 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2175 dout("do_request no mds or not active, waiting for map\n");
2176 list_add(&req->r_wait, &mdsc->waiting_for_map);
2177 goto out;
2178 }
2179
2180 /* get, open session */
2181 session = __ceph_lookup_mds_session(mdsc, mds);
2182 if (!session) {
2183 session = register_session(mdsc, mds);
2184 if (IS_ERR(session)) {
2185 err = PTR_ERR(session);
2186 goto finish;
2187 }
2188 }
2189 req->r_session = get_session(session);
2190
2191 dout("do_request mds%d session %p state %s\n", mds, session,
2192 ceph_session_state_name(session->s_state));
2193 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2194 session->s_state != CEPH_MDS_SESSION_HUNG) {
2195 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2196 session->s_state == CEPH_MDS_SESSION_CLOSING)
2197 __open_session(mdsc, session);
2198 list_add(&req->r_wait, &session->s_waiting);
2199 goto out_session;
2200 }
2201
2202 /* send request */
2203 req->r_resend_mds = -1; /* forget any previous mds hint */
2204
2205 if (req->r_request_started == 0) /* note request start time */
2206 req->r_request_started = jiffies;
2207
2208 err = __prepare_send_request(mdsc, req, mds, false);
2209 if (!err) {
2210 ceph_msg_get(req->r_request);
2211 ceph_con_send(&session->s_con, req->r_request);
2212 }
2213
2214 out_session:
2215 ceph_put_mds_session(session);
2216 finish:
2217 if (err) {
2218 dout("__do_request early error %d\n", err);
2219 req->r_err = err;
2220 complete_request(mdsc, req);
2221 __unregister_request(mdsc, req);
2222 }
2223 out:
2224 return err;
2225 }
2226
2227 /*
2228 * called under mdsc->mutex
2229 */
2230 static void __wake_requests(struct ceph_mds_client *mdsc,
2231 struct list_head *head)
2232 {
2233 struct ceph_mds_request *req;
2234 LIST_HEAD(tmp_list);
2235
2236 list_splice_init(head, &tmp_list);
2237
2238 while (!list_empty(&tmp_list)) {
2239 req = list_entry(tmp_list.next,
2240 struct ceph_mds_request, r_wait);
2241 list_del_init(&req->r_wait);
2242 dout(" wake request %p tid %llu\n", req, req->r_tid);
2243 __do_request(mdsc, req);
2244 }
2245 }
2246
2247 /*
2248 * Wake up threads with requests pending for @mds, so that they can
2249 * resubmit their requests to a possibly different mds.
2250 */
2251 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2252 {
2253 struct ceph_mds_request *req;
2254 struct rb_node *p = rb_first(&mdsc->request_tree);
2255
2256 dout("kick_requests mds%d\n", mds);
2257 while (p) {
2258 req = rb_entry(p, struct ceph_mds_request, r_node);
2259 p = rb_next(p);
2260 if (req->r_got_unsafe)
2261 continue;
2262 if (req->r_attempts > 0)
2263 continue; /* only new requests */
2264 if (req->r_session &&
2265 req->r_session->s_mds == mds) {
2266 dout(" kicking tid %llu\n", req->r_tid);
2267 list_del_init(&req->r_wait);
2268 __do_request(mdsc, req);
2269 }
2270 }
2271 }
2272
2273 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2274 struct ceph_mds_request *req)
2275 {
2276 dout("submit_request on %p\n", req);
2277 mutex_lock(&mdsc->mutex);
2278 __register_request(mdsc, req, NULL);
2279 __do_request(mdsc, req);
2280 mutex_unlock(&mdsc->mutex);
2281 }
2282
2283 /*
2284 * Synchrously perform an mds request. Take care of all of the
2285 * session setup, forwarding, retry details.
2286 */
2287 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2288 struct inode *dir,
2289 struct ceph_mds_request *req)
2290 {
2291 int err;
2292
2293 dout("do_request on %p\n", req);
2294
2295 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2296 if (req->r_inode)
2297 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2298 if (req->r_locked_dir)
2299 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
2300 if (req->r_old_dentry_dir)
2301 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2302 CEPH_CAP_PIN);
2303
2304 /* issue */
2305 mutex_lock(&mdsc->mutex);
2306 __register_request(mdsc, req, dir);
2307 __do_request(mdsc, req);
2308
2309 if (req->r_err) {
2310 err = req->r_err;
2311 goto out;
2312 }
2313
2314 /* wait */
2315 mutex_unlock(&mdsc->mutex);
2316 dout("do_request waiting\n");
2317 if (!req->r_timeout && req->r_wait_for_completion) {
2318 err = req->r_wait_for_completion(mdsc, req);
2319 } else {
2320 long timeleft = wait_for_completion_killable_timeout(
2321 &req->r_completion,
2322 ceph_timeout_jiffies(req->r_timeout));
2323 if (timeleft > 0)
2324 err = 0;
2325 else if (!timeleft)
2326 err = -EIO; /* timed out */
2327 else
2328 err = timeleft; /* killed */
2329 }
2330 dout("do_request waited, got %d\n", err);
2331 mutex_lock(&mdsc->mutex);
2332
2333 /* only abort if we didn't race with a real reply */
2334 if (req->r_got_result) {
2335 err = le32_to_cpu(req->r_reply_info.head->result);
2336 } else if (err < 0) {
2337 dout("aborted request %lld with %d\n", req->r_tid, err);
2338
2339 /*
2340 * ensure we aren't running concurrently with
2341 * ceph_fill_trace or ceph_readdir_prepopulate, which
2342 * rely on locks (dir mutex) held by our caller.
2343 */
2344 mutex_lock(&req->r_fill_mutex);
2345 req->r_err = err;
2346 req->r_aborted = true;
2347 mutex_unlock(&req->r_fill_mutex);
2348
2349 if (req->r_locked_dir &&
2350 (req->r_op & CEPH_MDS_OP_WRITE))
2351 ceph_invalidate_dir_request(req);
2352 } else {
2353 err = req->r_err;
2354 }
2355
2356 out:
2357 mutex_unlock(&mdsc->mutex);
2358 dout("do_request %p done, result %d\n", req, err);
2359 return err;
2360 }
2361
2362 /*
2363 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2364 * namespace request.
2365 */
2366 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2367 {
2368 struct inode *inode = req->r_locked_dir;
2369
2370 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
2371
2372 ceph_dir_clear_complete(inode);
2373 if (req->r_dentry)
2374 ceph_invalidate_dentry_lease(req->r_dentry);
2375 if (req->r_old_dentry)
2376 ceph_invalidate_dentry_lease(req->r_old_dentry);
2377 }
2378
2379 /*
2380 * Handle mds reply.
2381 *
2382 * We take the session mutex and parse and process the reply immediately.
2383 * This preserves the logical ordering of replies, capabilities, etc., sent
2384 * by the MDS as they are applied to our local cache.
2385 */
2386 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2387 {
2388 struct ceph_mds_client *mdsc = session->s_mdsc;
2389 struct ceph_mds_request *req;
2390 struct ceph_mds_reply_head *head = msg->front.iov_base;
2391 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2392 struct ceph_snap_realm *realm;
2393 u64 tid;
2394 int err, result;
2395 int mds = session->s_mds;
2396
2397 if (msg->front.iov_len < sizeof(*head)) {
2398 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2399 ceph_msg_dump(msg);
2400 return;
2401 }
2402
2403 /* get request, session */
2404 tid = le64_to_cpu(msg->hdr.tid);
2405 mutex_lock(&mdsc->mutex);
2406 req = __lookup_request(mdsc, tid);
2407 if (!req) {
2408 dout("handle_reply on unknown tid %llu\n", tid);
2409 mutex_unlock(&mdsc->mutex);
2410 return;
2411 }
2412 dout("handle_reply %p\n", req);
2413
2414 /* correct session? */
2415 if (req->r_session != session) {
2416 pr_err("mdsc_handle_reply got %llu on session mds%d"
2417 " not mds%d\n", tid, session->s_mds,
2418 req->r_session ? req->r_session->s_mds : -1);
2419 mutex_unlock(&mdsc->mutex);
2420 goto out;
2421 }
2422
2423 /* dup? */
2424 if ((req->r_got_unsafe && !head->safe) ||
2425 (req->r_got_safe && head->safe)) {
2426 pr_warn("got a dup %s reply on %llu from mds%d\n",
2427 head->safe ? "safe" : "unsafe", tid, mds);
2428 mutex_unlock(&mdsc->mutex);
2429 goto out;
2430 }
2431 if (req->r_got_safe) {
2432 pr_warn("got unsafe after safe on %llu from mds%d\n",
2433 tid, mds);
2434 mutex_unlock(&mdsc->mutex);
2435 goto out;
2436 }
2437
2438 result = le32_to_cpu(head->result);
2439
2440 /*
2441 * Handle an ESTALE
2442 * if we're not talking to the authority, send to them
2443 * if the authority has changed while we weren't looking,
2444 * send to new authority
2445 * Otherwise we just have to return an ESTALE
2446 */
2447 if (result == -ESTALE) {
2448 dout("got ESTALE on request %llu", req->r_tid);
2449 req->r_resend_mds = -1;
2450 if (req->r_direct_mode != USE_AUTH_MDS) {
2451 dout("not using auth, setting for that now");
2452 req->r_direct_mode = USE_AUTH_MDS;
2453 __do_request(mdsc, req);
2454 mutex_unlock(&mdsc->mutex);
2455 goto out;
2456 } else {
2457 int mds = __choose_mds(mdsc, req);
2458 if (mds >= 0 && mds != req->r_session->s_mds) {
2459 dout("but auth changed, so resending");
2460 __do_request(mdsc, req);
2461 mutex_unlock(&mdsc->mutex);
2462 goto out;
2463 }
2464 }
2465 dout("have to return ESTALE on request %llu", req->r_tid);
2466 }
2467
2468
2469 if (head->safe) {
2470 req->r_got_safe = true;
2471 __unregister_request(mdsc, req);
2472
2473 if (req->r_got_unsafe) {
2474 /*
2475 * We already handled the unsafe response, now do the
2476 * cleanup. No need to examine the response; the MDS
2477 * doesn't include any result info in the safe
2478 * response. And even if it did, there is nothing
2479 * useful we could do with a revised return value.
2480 */
2481 dout("got safe reply %llu, mds%d\n", tid, mds);
2482
2483 /* last unsafe request during umount? */
2484 if (mdsc->stopping && !__get_oldest_req(mdsc))
2485 complete_all(&mdsc->safe_umount_waiters);
2486 mutex_unlock(&mdsc->mutex);
2487 goto out;
2488 }
2489 } else {
2490 req->r_got_unsafe = true;
2491 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2492 if (req->r_unsafe_dir) {
2493 struct ceph_inode_info *ci =
2494 ceph_inode(req->r_unsafe_dir);
2495 spin_lock(&ci->i_unsafe_lock);
2496 list_add_tail(&req->r_unsafe_dir_item,
2497 &ci->i_unsafe_dirops);
2498 spin_unlock(&ci->i_unsafe_lock);
2499 }
2500 }
2501
2502 dout("handle_reply tid %lld result %d\n", tid, result);
2503 rinfo = &req->r_reply_info;
2504 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2505 mutex_unlock(&mdsc->mutex);
2506
2507 mutex_lock(&session->s_mutex);
2508 if (err < 0) {
2509 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2510 ceph_msg_dump(msg);
2511 goto out_err;
2512 }
2513
2514 /* snap trace */
2515 realm = NULL;
2516 if (rinfo->snapblob_len) {
2517 down_write(&mdsc->snap_rwsem);
2518 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2519 rinfo->snapblob + rinfo->snapblob_len,
2520 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2521 &realm);
2522 downgrade_write(&mdsc->snap_rwsem);
2523 } else {
2524 down_read(&mdsc->snap_rwsem);
2525 }
2526
2527 /* insert trace into our cache */
2528 mutex_lock(&req->r_fill_mutex);
2529 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2530 if (err == 0) {
2531 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2532 req->r_op == CEPH_MDS_OP_LSSNAP))
2533 ceph_readdir_prepopulate(req, req->r_session);
2534 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2535 }
2536 mutex_unlock(&req->r_fill_mutex);
2537
2538 up_read(&mdsc->snap_rwsem);
2539 if (realm)
2540 ceph_put_snap_realm(mdsc, realm);
2541
2542 if (err == 0 && req->r_got_unsafe && req->r_target_inode) {
2543 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2544 spin_lock(&ci->i_unsafe_lock);
2545 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2546 spin_unlock(&ci->i_unsafe_lock);
2547 }
2548 out_err:
2549 mutex_lock(&mdsc->mutex);
2550 if (!req->r_aborted) {
2551 if (err) {
2552 req->r_err = err;
2553 } else {
2554 req->r_reply = ceph_msg_get(msg);
2555 req->r_got_result = true;
2556 }
2557 } else {
2558 dout("reply arrived after request %lld was aborted\n", tid);
2559 }
2560 mutex_unlock(&mdsc->mutex);
2561
2562 mutex_unlock(&session->s_mutex);
2563
2564 /* kick calling process */
2565 complete_request(mdsc, req);
2566 out:
2567 ceph_mdsc_put_request(req);
2568 return;
2569 }
2570
2571
2572
2573 /*
2574 * handle mds notification that our request has been forwarded.
2575 */
2576 static void handle_forward(struct ceph_mds_client *mdsc,
2577 struct ceph_mds_session *session,
2578 struct ceph_msg *msg)
2579 {
2580 struct ceph_mds_request *req;
2581 u64 tid = le64_to_cpu(msg->hdr.tid);
2582 u32 next_mds;
2583 u32 fwd_seq;
2584 int err = -EINVAL;
2585 void *p = msg->front.iov_base;
2586 void *end = p + msg->front.iov_len;
2587
2588 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2589 next_mds = ceph_decode_32(&p);
2590 fwd_seq = ceph_decode_32(&p);
2591
2592 mutex_lock(&mdsc->mutex);
2593 req = __lookup_request(mdsc, tid);
2594 if (!req) {
2595 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2596 goto out; /* dup reply? */
2597 }
2598
2599 if (req->r_aborted) {
2600 dout("forward tid %llu aborted, unregistering\n", tid);
2601 __unregister_request(mdsc, req);
2602 } else if (fwd_seq <= req->r_num_fwd) {
2603 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2604 tid, next_mds, req->r_num_fwd, fwd_seq);
2605 } else {
2606 /* resend. forward race not possible; mds would drop */
2607 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2608 BUG_ON(req->r_err);
2609 BUG_ON(req->r_got_result);
2610 req->r_attempts = 0;
2611 req->r_num_fwd = fwd_seq;
2612 req->r_resend_mds = next_mds;
2613 put_request_session(req);
2614 __do_request(mdsc, req);
2615 }
2616 ceph_mdsc_put_request(req);
2617 out:
2618 mutex_unlock(&mdsc->mutex);
2619 return;
2620
2621 bad:
2622 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2623 }
2624
2625 /*
2626 * handle a mds session control message
2627 */
2628 static void handle_session(struct ceph_mds_session *session,
2629 struct ceph_msg *msg)
2630 {
2631 struct ceph_mds_client *mdsc = session->s_mdsc;
2632 u32 op;
2633 u64 seq;
2634 int mds = session->s_mds;
2635 struct ceph_mds_session_head *h = msg->front.iov_base;
2636 int wake = 0;
2637
2638 /* decode */
2639 if (msg->front.iov_len != sizeof(*h))
2640 goto bad;
2641 op = le32_to_cpu(h->op);
2642 seq = le64_to_cpu(h->seq);
2643
2644 mutex_lock(&mdsc->mutex);
2645 if (op == CEPH_SESSION_CLOSE)
2646 __unregister_session(mdsc, session);
2647 /* FIXME: this ttl calculation is generous */
2648 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2649 mutex_unlock(&mdsc->mutex);
2650
2651 mutex_lock(&session->s_mutex);
2652
2653 dout("handle_session mds%d %s %p state %s seq %llu\n",
2654 mds, ceph_session_op_name(op), session,
2655 ceph_session_state_name(session->s_state), seq);
2656
2657 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2658 session->s_state = CEPH_MDS_SESSION_OPEN;
2659 pr_info("mds%d came back\n", session->s_mds);
2660 }
2661
2662 switch (op) {
2663 case CEPH_SESSION_OPEN:
2664 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2665 pr_info("mds%d reconnect success\n", session->s_mds);
2666 session->s_state = CEPH_MDS_SESSION_OPEN;
2667 renewed_caps(mdsc, session, 0);
2668 wake = 1;
2669 if (mdsc->stopping)
2670 __close_session(mdsc, session);
2671 break;
2672
2673 case CEPH_SESSION_RENEWCAPS:
2674 if (session->s_renew_seq == seq)
2675 renewed_caps(mdsc, session, 1);
2676 break;
2677
2678 case CEPH_SESSION_CLOSE:
2679 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2680 pr_info("mds%d reconnect denied\n", session->s_mds);
2681 cleanup_session_requests(mdsc, session);
2682 remove_session_caps(session);
2683 wake = 2; /* for good measure */
2684 wake_up_all(&mdsc->session_close_wq);
2685 break;
2686
2687 case CEPH_SESSION_STALE:
2688 pr_info("mds%d caps went stale, renewing\n",
2689 session->s_mds);
2690 spin_lock(&session->s_gen_ttl_lock);
2691 session->s_cap_gen++;
2692 session->s_cap_ttl = jiffies - 1;
2693 spin_unlock(&session->s_gen_ttl_lock);
2694 send_renew_caps(mdsc, session);
2695 break;
2696
2697 case CEPH_SESSION_RECALL_STATE:
2698 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2699 break;
2700
2701 case CEPH_SESSION_FLUSHMSG:
2702 send_flushmsg_ack(mdsc, session, seq);
2703 break;
2704
2705 case CEPH_SESSION_FORCE_RO:
2706 dout("force_session_readonly %p\n", session);
2707 spin_lock(&session->s_cap_lock);
2708 session->s_readonly = true;
2709 spin_unlock(&session->s_cap_lock);
2710 wake_up_session_caps(session, 0);
2711 break;
2712
2713 default:
2714 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2715 WARN_ON(1);
2716 }
2717
2718 mutex_unlock(&session->s_mutex);
2719 if (wake) {
2720 mutex_lock(&mdsc->mutex);
2721 __wake_requests(mdsc, &session->s_waiting);
2722 if (wake == 2)
2723 kick_requests(mdsc, mds);
2724 mutex_unlock(&mdsc->mutex);
2725 }
2726 return;
2727
2728 bad:
2729 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2730 (int)msg->front.iov_len);
2731 ceph_msg_dump(msg);
2732 return;
2733 }
2734
2735
2736 /*
2737 * called under session->mutex.
2738 */
2739 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2740 struct ceph_mds_session *session)
2741 {
2742 struct ceph_mds_request *req, *nreq;
2743 struct rb_node *p;
2744 int err;
2745
2746 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2747
2748 mutex_lock(&mdsc->mutex);
2749 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2750 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2751 if (!err) {
2752 ceph_msg_get(req->r_request);
2753 ceph_con_send(&session->s_con, req->r_request);
2754 }
2755 }
2756
2757 /*
2758 * also re-send old requests when MDS enters reconnect stage. So that MDS
2759 * can process completed request in clientreplay stage.
2760 */
2761 p = rb_first(&mdsc->request_tree);
2762 while (p) {
2763 req = rb_entry(p, struct ceph_mds_request, r_node);
2764 p = rb_next(p);
2765 if (req->r_got_unsafe)
2766 continue;
2767 if (req->r_attempts == 0)
2768 continue; /* only old requests */
2769 if (req->r_session &&
2770 req->r_session->s_mds == session->s_mds) {
2771 err = __prepare_send_request(mdsc, req,
2772 session->s_mds, true);
2773 if (!err) {
2774 ceph_msg_get(req->r_request);
2775 ceph_con_send(&session->s_con, req->r_request);
2776 }
2777 }
2778 }
2779 mutex_unlock(&mdsc->mutex);
2780 }
2781
2782 /*
2783 * Encode information about a cap for a reconnect with the MDS.
2784 */
2785 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2786 void *arg)
2787 {
2788 union {
2789 struct ceph_mds_cap_reconnect v2;
2790 struct ceph_mds_cap_reconnect_v1 v1;
2791 } rec;
2792 size_t reclen;
2793 struct ceph_inode_info *ci;
2794 struct ceph_reconnect_state *recon_state = arg;
2795 struct ceph_pagelist *pagelist = recon_state->pagelist;
2796 char *path;
2797 int pathlen, err;
2798 u64 pathbase;
2799 struct dentry *dentry;
2800
2801 ci = cap->ci;
2802
2803 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2804 inode, ceph_vinop(inode), cap, cap->cap_id,
2805 ceph_cap_string(cap->issued));
2806 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2807 if (err)
2808 return err;
2809
2810 dentry = d_find_alias(inode);
2811 if (dentry) {
2812 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2813 if (IS_ERR(path)) {
2814 err = PTR_ERR(path);
2815 goto out_dput;
2816 }
2817 } else {
2818 path = NULL;
2819 pathlen = 0;
2820 }
2821 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2822 if (err)
2823 goto out_free;
2824
2825 spin_lock(&ci->i_ceph_lock);
2826 cap->seq = 0; /* reset cap seq */
2827 cap->issue_seq = 0; /* and issue_seq */
2828 cap->mseq = 0; /* and migrate_seq */
2829 cap->cap_gen = cap->session->s_cap_gen;
2830
2831 if (recon_state->flock) {
2832 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2833 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2834 rec.v2.issued = cpu_to_le32(cap->issued);
2835 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2836 rec.v2.pathbase = cpu_to_le64(pathbase);
2837 rec.v2.flock_len = 0;
2838 reclen = sizeof(rec.v2);
2839 } else {
2840 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2841 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2842 rec.v1.issued = cpu_to_le32(cap->issued);
2843 rec.v1.size = cpu_to_le64(inode->i_size);
2844 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2845 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2846 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2847 rec.v1.pathbase = cpu_to_le64(pathbase);
2848 reclen = sizeof(rec.v1);
2849 }
2850 spin_unlock(&ci->i_ceph_lock);
2851
2852 if (recon_state->flock) {
2853 int num_fcntl_locks, num_flock_locks;
2854 struct ceph_filelock *flocks;
2855
2856 encode_again:
2857 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
2858 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2859 sizeof(struct ceph_filelock), GFP_NOFS);
2860 if (!flocks) {
2861 err = -ENOMEM;
2862 goto out_free;
2863 }
2864 err = ceph_encode_locks_to_buffer(inode, flocks,
2865 num_fcntl_locks,
2866 num_flock_locks);
2867 if (err) {
2868 kfree(flocks);
2869 if (err == -ENOSPC)
2870 goto encode_again;
2871 goto out_free;
2872 }
2873 /*
2874 * number of encoded locks is stable, so copy to pagelist
2875 */
2876 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
2877 (num_fcntl_locks+num_flock_locks) *
2878 sizeof(struct ceph_filelock));
2879 err = ceph_pagelist_append(pagelist, &rec, reclen);
2880 if (!err)
2881 err = ceph_locks_to_pagelist(flocks, pagelist,
2882 num_fcntl_locks,
2883 num_flock_locks);
2884 kfree(flocks);
2885 } else {
2886 err = ceph_pagelist_append(pagelist, &rec, reclen);
2887 }
2888
2889 recon_state->nr_caps++;
2890 out_free:
2891 kfree(path);
2892 out_dput:
2893 dput(dentry);
2894 return err;
2895 }
2896
2897
2898 /*
2899 * If an MDS fails and recovers, clients need to reconnect in order to
2900 * reestablish shared state. This includes all caps issued through
2901 * this session _and_ the snap_realm hierarchy. Because it's not
2902 * clear which snap realms the mds cares about, we send everything we
2903 * know about.. that ensures we'll then get any new info the
2904 * recovering MDS might have.
2905 *
2906 * This is a relatively heavyweight operation, but it's rare.
2907 *
2908 * called with mdsc->mutex held.
2909 */
2910 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2911 struct ceph_mds_session *session)
2912 {
2913 struct ceph_msg *reply;
2914 struct rb_node *p;
2915 int mds = session->s_mds;
2916 int err = -ENOMEM;
2917 int s_nr_caps;
2918 struct ceph_pagelist *pagelist;
2919 struct ceph_reconnect_state recon_state;
2920
2921 pr_info("mds%d reconnect start\n", mds);
2922
2923 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2924 if (!pagelist)
2925 goto fail_nopagelist;
2926 ceph_pagelist_init(pagelist);
2927
2928 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
2929 if (!reply)
2930 goto fail_nomsg;
2931
2932 mutex_lock(&session->s_mutex);
2933 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2934 session->s_seq = 0;
2935
2936 dout("session %p state %s\n", session,
2937 ceph_session_state_name(session->s_state));
2938
2939 spin_lock(&session->s_gen_ttl_lock);
2940 session->s_cap_gen++;
2941 spin_unlock(&session->s_gen_ttl_lock);
2942
2943 spin_lock(&session->s_cap_lock);
2944 /* don't know if session is readonly */
2945 session->s_readonly = 0;
2946 /*
2947 * notify __ceph_remove_cap() that we are composing cap reconnect.
2948 * If a cap get released before being added to the cap reconnect,
2949 * __ceph_remove_cap() should skip queuing cap release.
2950 */
2951 session->s_cap_reconnect = 1;
2952 /* drop old cap expires; we're about to reestablish that state */
2953 cleanup_cap_releases(mdsc, session);
2954
2955 /* trim unused caps to reduce MDS's cache rejoin time */
2956 if (mdsc->fsc->sb->s_root)
2957 shrink_dcache_parent(mdsc->fsc->sb->s_root);
2958
2959 ceph_con_close(&session->s_con);
2960 ceph_con_open(&session->s_con,
2961 CEPH_ENTITY_TYPE_MDS, mds,
2962 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2963
2964 /* replay unsafe requests */
2965 replay_unsafe_requests(mdsc, session);
2966
2967 down_read(&mdsc->snap_rwsem);
2968
2969 /* traverse this session's caps */
2970 s_nr_caps = session->s_nr_caps;
2971 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
2972 if (err)
2973 goto fail;
2974
2975 recon_state.nr_caps = 0;
2976 recon_state.pagelist = pagelist;
2977 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2978 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2979 if (err < 0)
2980 goto fail;
2981
2982 spin_lock(&session->s_cap_lock);
2983 session->s_cap_reconnect = 0;
2984 spin_unlock(&session->s_cap_lock);
2985
2986 /*
2987 * snaprealms. we provide mds with the ino, seq (version), and
2988 * parent for all of our realms. If the mds has any newer info,
2989 * it will tell us.
2990 */
2991 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2992 struct ceph_snap_realm *realm =
2993 rb_entry(p, struct ceph_snap_realm, node);
2994 struct ceph_mds_snaprealm_reconnect sr_rec;
2995
2996 dout(" adding snap realm %llx seq %lld parent %llx\n",
2997 realm->ino, realm->seq, realm->parent_ino);
2998 sr_rec.ino = cpu_to_le64(realm->ino);
2999 sr_rec.seq = cpu_to_le64(realm->seq);
3000 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3001 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3002 if (err)
3003 goto fail;
3004 }
3005
3006 if (recon_state.flock)
3007 reply->hdr.version = cpu_to_le16(2);
3008
3009 /* raced with cap release? */
3010 if (s_nr_caps != recon_state.nr_caps) {
3011 struct page *page = list_first_entry(&pagelist->head,
3012 struct page, lru);
3013 __le32 *addr = kmap_atomic(page);
3014 *addr = cpu_to_le32(recon_state.nr_caps);
3015 kunmap_atomic(addr);
3016 }
3017
3018 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3019 ceph_msg_data_add_pagelist(reply, pagelist);
3020
3021 ceph_early_kick_flushing_caps(mdsc, session);
3022
3023 ceph_con_send(&session->s_con, reply);
3024
3025 mutex_unlock(&session->s_mutex);
3026
3027 mutex_lock(&mdsc->mutex);
3028 __wake_requests(mdsc, &session->s_waiting);
3029 mutex_unlock(&mdsc->mutex);
3030
3031 up_read(&mdsc->snap_rwsem);
3032 return;
3033
3034 fail:
3035 ceph_msg_put(reply);
3036 up_read(&mdsc->snap_rwsem);
3037 mutex_unlock(&session->s_mutex);
3038 fail_nomsg:
3039 ceph_pagelist_release(pagelist);
3040 fail_nopagelist:
3041 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
3042 return;
3043 }
3044
3045
3046 /*
3047 * compare old and new mdsmaps, kicking requests
3048 * and closing out old connections as necessary
3049 *
3050 * called under mdsc->mutex.
3051 */
3052 static void check_new_map(struct ceph_mds_client *mdsc,
3053 struct ceph_mdsmap *newmap,
3054 struct ceph_mdsmap *oldmap)
3055 {
3056 int i;
3057 int oldstate, newstate;
3058 struct ceph_mds_session *s;
3059
3060 dout("check_new_map new %u old %u\n",
3061 newmap->m_epoch, oldmap->m_epoch);
3062
3063 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
3064 if (mdsc->sessions[i] == NULL)
3065 continue;
3066 s = mdsc->sessions[i];
3067 oldstate = ceph_mdsmap_get_state(oldmap, i);
3068 newstate = ceph_mdsmap_get_state(newmap, i);
3069
3070 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3071 i, ceph_mds_state_name(oldstate),
3072 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
3073 ceph_mds_state_name(newstate),
3074 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
3075 ceph_session_state_name(s->s_state));
3076
3077 if (i >= newmap->m_max_mds ||
3078 memcmp(ceph_mdsmap_get_addr(oldmap, i),
3079 ceph_mdsmap_get_addr(newmap, i),
3080 sizeof(struct ceph_entity_addr))) {
3081 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3082 /* the session never opened, just close it
3083 * out now */
3084 __wake_requests(mdsc, &s->s_waiting);
3085 __unregister_session(mdsc, s);
3086 } else {
3087 /* just close it */
3088 mutex_unlock(&mdsc->mutex);
3089 mutex_lock(&s->s_mutex);
3090 mutex_lock(&mdsc->mutex);
3091 ceph_con_close(&s->s_con);
3092 mutex_unlock(&s->s_mutex);
3093 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3094 }
3095 } else if (oldstate == newstate) {
3096 continue; /* nothing new with this mds */
3097 }
3098
3099 /*
3100 * send reconnect?
3101 */
3102 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
3103 newstate >= CEPH_MDS_STATE_RECONNECT) {
3104 mutex_unlock(&mdsc->mutex);
3105 send_mds_reconnect(mdsc, s);
3106 mutex_lock(&mdsc->mutex);
3107 }
3108
3109 /*
3110 * kick request on any mds that has gone active.
3111 */
3112 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3113 newstate >= CEPH_MDS_STATE_ACTIVE) {
3114 if (oldstate != CEPH_MDS_STATE_CREATING &&
3115 oldstate != CEPH_MDS_STATE_STARTING)
3116 pr_info("mds%d recovery completed\n", s->s_mds);
3117 kick_requests(mdsc, i);
3118 ceph_kick_flushing_caps(mdsc, s);
3119 wake_up_session_caps(s, 1);
3120 }
3121 }
3122
3123 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
3124 s = mdsc->sessions[i];
3125 if (!s)
3126 continue;
3127 if (!ceph_mdsmap_is_laggy(newmap, i))
3128 continue;
3129 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3130 s->s_state == CEPH_MDS_SESSION_HUNG ||
3131 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3132 dout(" connecting to export targets of laggy mds%d\n",
3133 i);
3134 __open_export_target_sessions(mdsc, s);
3135 }
3136 }
3137 }
3138
3139
3140
3141 /*
3142 * leases
3143 */
3144
3145 /*
3146 * caller must hold session s_mutex, dentry->d_lock
3147 */
3148 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3149 {
3150 struct ceph_dentry_info *di = ceph_dentry(dentry);
3151
3152 ceph_put_mds_session(di->lease_session);
3153 di->lease_session = NULL;
3154 }
3155
3156 static void handle_lease(struct ceph_mds_client *mdsc,
3157 struct ceph_mds_session *session,
3158 struct ceph_msg *msg)
3159 {
3160 struct super_block *sb = mdsc->fsc->sb;
3161 struct inode *inode;
3162 struct dentry *parent, *dentry;
3163 struct ceph_dentry_info *di;
3164 int mds = session->s_mds;
3165 struct ceph_mds_lease *h = msg->front.iov_base;
3166 u32 seq;
3167 struct ceph_vino vino;
3168 struct qstr dname;
3169 int release = 0;
3170
3171 dout("handle_lease from mds%d\n", mds);
3172
3173 /* decode */
3174 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3175 goto bad;
3176 vino.ino = le64_to_cpu(h->ino);
3177 vino.snap = CEPH_NOSNAP;
3178 seq = le32_to_cpu(h->seq);
3179 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3180 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3181 if (dname.len != get_unaligned_le32(h+1))
3182 goto bad;
3183
3184 /* lookup inode */
3185 inode = ceph_find_inode(sb, vino);
3186 dout("handle_lease %s, ino %llx %p %.*s\n",
3187 ceph_lease_op_name(h->action), vino.ino, inode,
3188 dname.len, dname.name);
3189
3190 mutex_lock(&session->s_mutex);
3191 session->s_seq++;
3192
3193 if (inode == NULL) {
3194 dout("handle_lease no inode %llx\n", vino.ino);
3195 goto release;
3196 }
3197
3198 /* dentry */
3199 parent = d_find_alias(inode);
3200 if (!parent) {
3201 dout("no parent dentry on inode %p\n", inode);
3202 WARN_ON(1);
3203 goto release; /* hrm... */
3204 }
3205 dname.hash = full_name_hash(dname.name, dname.len);
3206 dentry = d_lookup(parent, &dname);
3207 dput(parent);
3208 if (!dentry)
3209 goto release;
3210
3211 spin_lock(&dentry->d_lock);
3212 di = ceph_dentry(dentry);
3213 switch (h->action) {
3214 case CEPH_MDS_LEASE_REVOKE:
3215 if (di->lease_session == session) {
3216 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3217 h->seq = cpu_to_le32(di->lease_seq);
3218 __ceph_mdsc_drop_dentry_lease(dentry);
3219 }
3220 release = 1;
3221 break;
3222
3223 case CEPH_MDS_LEASE_RENEW:
3224 if (di->lease_session == session &&
3225 di->lease_gen == session->s_cap_gen &&
3226 di->lease_renew_from &&
3227 di->lease_renew_after == 0) {
3228 unsigned long duration =
3229 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
3230
3231 di->lease_seq = seq;
3232 dentry->d_time = di->lease_renew_from + duration;
3233 di->lease_renew_after = di->lease_renew_from +
3234 (duration >> 1);
3235 di->lease_renew_from = 0;
3236 }
3237 break;
3238 }
3239 spin_unlock(&dentry->d_lock);
3240 dput(dentry);
3241
3242 if (!release)
3243 goto out;
3244
3245 release:
3246 /* let's just reuse the same message */
3247 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3248 ceph_msg_get(msg);
3249 ceph_con_send(&session->s_con, msg);
3250
3251 out:
3252 iput(inode);
3253 mutex_unlock(&session->s_mutex);
3254 return;
3255
3256 bad:
3257 pr_err("corrupt lease message\n");
3258 ceph_msg_dump(msg);
3259 }
3260
3261 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3262 struct inode *inode,
3263 struct dentry *dentry, char action,
3264 u32 seq)
3265 {
3266 struct ceph_msg *msg;
3267 struct ceph_mds_lease *lease;
3268 int len = sizeof(*lease) + sizeof(u32);
3269 int dnamelen = 0;
3270
3271 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3272 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3273 dnamelen = dentry->d_name.len;
3274 len += dnamelen;
3275
3276 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
3277 if (!msg)
3278 return;
3279 lease = msg->front.iov_base;
3280 lease->action = action;
3281 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3282 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3283 lease->seq = cpu_to_le32(seq);
3284 put_unaligned_le32(dnamelen, lease + 1);
3285 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3286
3287 /*
3288 * if this is a preemptive lease RELEASE, no need to
3289 * flush request stream, since the actual request will
3290 * soon follow.
3291 */
3292 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3293
3294 ceph_con_send(&session->s_con, msg);
3295 }
3296
3297 /*
3298 * Preemptively release a lease we expect to invalidate anyway.
3299 * Pass @inode always, @dentry is optional.
3300 */
3301 void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
3302 struct dentry *dentry)
3303 {
3304 struct ceph_dentry_info *di;
3305 struct ceph_mds_session *session;
3306 u32 seq;
3307
3308 BUG_ON(inode == NULL);
3309 BUG_ON(dentry == NULL);
3310
3311 /* is dentry lease valid? */
3312 spin_lock(&dentry->d_lock);
3313 di = ceph_dentry(dentry);
3314 if (!di || !di->lease_session ||
3315 di->lease_session->s_mds < 0 ||
3316 di->lease_gen != di->lease_session->s_cap_gen ||
3317 !time_before(jiffies, dentry->d_time)) {
3318 dout("lease_release inode %p dentry %p -- "
3319 "no lease\n",
3320 inode, dentry);
3321 spin_unlock(&dentry->d_lock);
3322 return;
3323 }
3324
3325 /* we do have a lease on this dentry; note mds and seq */
3326 session = ceph_get_mds_session(di->lease_session);
3327 seq = di->lease_seq;
3328 __ceph_mdsc_drop_dentry_lease(dentry);
3329 spin_unlock(&dentry->d_lock);
3330
3331 dout("lease_release inode %p dentry %p to mds%d\n",
3332 inode, dentry, session->s_mds);
3333 ceph_mdsc_lease_send_msg(session, inode, dentry,
3334 CEPH_MDS_LEASE_RELEASE, seq);
3335 ceph_put_mds_session(session);
3336 }
3337
3338 /*
3339 * drop all leases (and dentry refs) in preparation for umount
3340 */
3341 static void drop_leases(struct ceph_mds_client *mdsc)
3342 {
3343 int i;
3344
3345 dout("drop_leases\n");
3346 mutex_lock(&mdsc->mutex);
3347 for (i = 0; i < mdsc->max_sessions; i++) {
3348 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3349 if (!s)
3350 continue;
3351 mutex_unlock(&mdsc->mutex);
3352 mutex_lock(&s->s_mutex);
3353 mutex_unlock(&s->s_mutex);
3354 ceph_put_mds_session(s);
3355 mutex_lock(&mdsc->mutex);
3356 }
3357 mutex_unlock(&mdsc->mutex);
3358 }
3359
3360
3361
3362 /*
3363 * delayed work -- periodically trim expired leases, renew caps with mds
3364 */
3365 static void schedule_delayed(struct ceph_mds_client *mdsc)
3366 {
3367 int delay = 5;
3368 unsigned hz = round_jiffies_relative(HZ * delay);
3369 schedule_delayed_work(&mdsc->delayed_work, hz);
3370 }
3371
3372 static void delayed_work(struct work_struct *work)
3373 {
3374 int i;
3375 struct ceph_mds_client *mdsc =
3376 container_of(work, struct ceph_mds_client, delayed_work.work);
3377 int renew_interval;
3378 int renew_caps;
3379
3380 dout("mdsc delayed_work\n");
3381 ceph_check_delayed_caps(mdsc);
3382
3383 mutex_lock(&mdsc->mutex);
3384 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3385 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3386 mdsc->last_renew_caps);
3387 if (renew_caps)
3388 mdsc->last_renew_caps = jiffies;
3389
3390 for (i = 0; i < mdsc->max_sessions; i++) {
3391 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3392 if (s == NULL)
3393 continue;
3394 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3395 dout("resending session close request for mds%d\n",
3396 s->s_mds);
3397 request_close_session(mdsc, s);
3398 ceph_put_mds_session(s);
3399 continue;
3400 }
3401 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3402 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3403 s->s_state = CEPH_MDS_SESSION_HUNG;
3404 pr_info("mds%d hung\n", s->s_mds);
3405 }
3406 }
3407 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3408 /* this mds is failed or recovering, just wait */
3409 ceph_put_mds_session(s);
3410 continue;
3411 }
3412 mutex_unlock(&mdsc->mutex);
3413
3414 mutex_lock(&s->s_mutex);
3415 if (renew_caps)
3416 send_renew_caps(mdsc, s);
3417 else
3418 ceph_con_keepalive(&s->s_con);
3419 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3420 s->s_state == CEPH_MDS_SESSION_HUNG)
3421 ceph_send_cap_releases(mdsc, s);
3422 mutex_unlock(&s->s_mutex);
3423 ceph_put_mds_session(s);
3424
3425 mutex_lock(&mdsc->mutex);
3426 }
3427 mutex_unlock(&mdsc->mutex);
3428
3429 schedule_delayed(mdsc);
3430 }
3431
3432 int ceph_mdsc_init(struct ceph_fs_client *fsc)
3433
3434 {
3435 struct ceph_mds_client *mdsc;
3436
3437 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3438 if (!mdsc)
3439 return -ENOMEM;
3440 mdsc->fsc = fsc;
3441 fsc->mdsc = mdsc;
3442 mutex_init(&mdsc->mutex);
3443 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3444 if (mdsc->mdsmap == NULL) {
3445 kfree(mdsc);
3446 return -ENOMEM;
3447 }
3448
3449 init_completion(&mdsc->safe_umount_waiters);
3450 init_waitqueue_head(&mdsc->session_close_wq);
3451 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3452 mdsc->sessions = NULL;
3453 atomic_set(&mdsc->num_sessions, 0);
3454 mdsc->max_sessions = 0;
3455 mdsc->stopping = 0;
3456 mdsc->last_snap_seq = 0;
3457 init_rwsem(&mdsc->snap_rwsem);
3458 mdsc->snap_realms = RB_ROOT;
3459 INIT_LIST_HEAD(&mdsc->snap_empty);
3460 spin_lock_init(&mdsc->snap_empty_lock);
3461 mdsc->last_tid = 0;
3462 mdsc->oldest_tid = 0;
3463 mdsc->request_tree = RB_ROOT;
3464 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3465 mdsc->last_renew_caps = jiffies;
3466 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3467 spin_lock_init(&mdsc->cap_delay_lock);
3468 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3469 spin_lock_init(&mdsc->snap_flush_lock);
3470 mdsc->last_cap_flush_tid = 1;
3471 mdsc->cap_flush_tree = RB_ROOT;
3472 INIT_LIST_HEAD(&mdsc->cap_dirty);
3473 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3474 mdsc->num_cap_flushing = 0;
3475 spin_lock_init(&mdsc->cap_dirty_lock);
3476 init_waitqueue_head(&mdsc->cap_flushing_wq);
3477 spin_lock_init(&mdsc->dentry_lru_lock);
3478 INIT_LIST_HEAD(&mdsc->dentry_lru);
3479
3480 ceph_caps_init(mdsc);
3481 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3482
3483 init_rwsem(&mdsc->pool_perm_rwsem);
3484 mdsc->pool_perm_tree = RB_ROOT;
3485
3486 return 0;
3487 }
3488
3489 /*
3490 * Wait for safe replies on open mds requests. If we time out, drop
3491 * all requests from the tree to avoid dangling dentry refs.
3492 */
3493 static void wait_requests(struct ceph_mds_client *mdsc)
3494 {
3495 struct ceph_options *opts = mdsc->fsc->client->options;
3496 struct ceph_mds_request *req;
3497
3498 mutex_lock(&mdsc->mutex);
3499 if (__get_oldest_req(mdsc)) {
3500 mutex_unlock(&mdsc->mutex);
3501
3502 dout("wait_requests waiting for requests\n");
3503 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3504 ceph_timeout_jiffies(opts->mount_timeout));
3505
3506 /* tear down remaining requests */
3507 mutex_lock(&mdsc->mutex);
3508 while ((req = __get_oldest_req(mdsc))) {
3509 dout("wait_requests timed out on tid %llu\n",
3510 req->r_tid);
3511 __unregister_request(mdsc, req);
3512 }
3513 }
3514 mutex_unlock(&mdsc->mutex);
3515 dout("wait_requests done\n");
3516 }
3517
3518 /*
3519 * called before mount is ro, and before dentries are torn down.
3520 * (hmm, does this still race with new lookups?)
3521 */
3522 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3523 {
3524 dout("pre_umount\n");
3525 mdsc->stopping = 1;
3526
3527 drop_leases(mdsc);
3528 ceph_flush_dirty_caps(mdsc);
3529 wait_requests(mdsc);
3530
3531 /*
3532 * wait for reply handlers to drop their request refs and
3533 * their inode/dcache refs
3534 */
3535 ceph_msgr_flush();
3536 }
3537
3538 /*
3539 * wait for all write mds requests to flush.
3540 */
3541 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3542 {
3543 struct ceph_mds_request *req = NULL, *nextreq;
3544 struct rb_node *n;
3545
3546 mutex_lock(&mdsc->mutex);
3547 dout("wait_unsafe_requests want %lld\n", want_tid);
3548 restart:
3549 req = __get_oldest_req(mdsc);
3550 while (req && req->r_tid <= want_tid) {
3551 /* find next request */
3552 n = rb_next(&req->r_node);
3553 if (n)
3554 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3555 else
3556 nextreq = NULL;
3557 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3558 (req->r_op & CEPH_MDS_OP_WRITE)) {
3559 /* write op */
3560 ceph_mdsc_get_request(req);
3561 if (nextreq)
3562 ceph_mdsc_get_request(nextreq);
3563 mutex_unlock(&mdsc->mutex);
3564 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3565 req->r_tid, want_tid);
3566 wait_for_completion(&req->r_safe_completion);
3567 mutex_lock(&mdsc->mutex);
3568 ceph_mdsc_put_request(req);
3569 if (!nextreq)
3570 break; /* next dne before, so we're done! */
3571 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3572 /* next request was removed from tree */
3573 ceph_mdsc_put_request(nextreq);
3574 goto restart;
3575 }
3576 ceph_mdsc_put_request(nextreq); /* won't go away */
3577 }
3578 req = nextreq;
3579 }
3580 mutex_unlock(&mdsc->mutex);
3581 dout("wait_unsafe_requests done\n");
3582 }
3583
3584 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3585 {
3586 u64 want_tid, want_flush, want_snap;
3587
3588 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3589 return;
3590
3591 dout("sync\n");
3592 mutex_lock(&mdsc->mutex);
3593 want_tid = mdsc->last_tid;
3594 mutex_unlock(&mdsc->mutex);
3595
3596 ceph_flush_dirty_caps(mdsc);
3597 spin_lock(&mdsc->cap_dirty_lock);
3598 want_flush = mdsc->last_cap_flush_tid;
3599 spin_unlock(&mdsc->cap_dirty_lock);
3600
3601 down_read(&mdsc->snap_rwsem);
3602 want_snap = mdsc->last_snap_seq;
3603 up_read(&mdsc->snap_rwsem);
3604
3605 dout("sync want tid %lld flush_seq %lld snap_seq %lld\n",
3606 want_tid, want_flush, want_snap);
3607
3608 wait_unsafe_requests(mdsc, want_tid);
3609 wait_caps_flush(mdsc, want_flush, want_snap);
3610 }
3611
3612 /*
3613 * true if all sessions are closed, or we force unmount
3614 */
3615 static bool done_closing_sessions(struct ceph_mds_client *mdsc)
3616 {
3617 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3618 return true;
3619 return atomic_read(&mdsc->num_sessions) == 0;
3620 }
3621
3622 /*
3623 * called after sb is ro.
3624 */
3625 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3626 {
3627 struct ceph_options *opts = mdsc->fsc->client->options;
3628 struct ceph_mds_session *session;
3629 int i;
3630
3631 dout("close_sessions\n");
3632
3633 /* close sessions */
3634 mutex_lock(&mdsc->mutex);
3635 for (i = 0; i < mdsc->max_sessions; i++) {
3636 session = __ceph_lookup_mds_session(mdsc, i);
3637 if (!session)
3638 continue;
3639 mutex_unlock(&mdsc->mutex);
3640 mutex_lock(&session->s_mutex);
3641 __close_session(mdsc, session);
3642 mutex_unlock(&session->s_mutex);
3643 ceph_put_mds_session(session);
3644 mutex_lock(&mdsc->mutex);
3645 }
3646 mutex_unlock(&mdsc->mutex);
3647
3648 dout("waiting for sessions to close\n");
3649 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3650 ceph_timeout_jiffies(opts->mount_timeout));
3651
3652 /* tear down remaining sessions */
3653 mutex_lock(&mdsc->mutex);
3654 for (i = 0; i < mdsc->max_sessions; i++) {
3655 if (mdsc->sessions[i]) {
3656 session = get_session(mdsc->sessions[i]);
3657 __unregister_session(mdsc, session);
3658 mutex_unlock(&mdsc->mutex);
3659 mutex_lock(&session->s_mutex);
3660 remove_session_caps(session);
3661 mutex_unlock(&session->s_mutex);
3662 ceph_put_mds_session(session);
3663 mutex_lock(&mdsc->mutex);
3664 }
3665 }
3666 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3667 mutex_unlock(&mdsc->mutex);
3668
3669 ceph_cleanup_empty_realms(mdsc);
3670
3671 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3672
3673 dout("stopped\n");
3674 }
3675
3676 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3677 {
3678 struct ceph_mds_session *session;
3679 int mds;
3680
3681 dout("force umount\n");
3682
3683 mutex_lock(&mdsc->mutex);
3684 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3685 session = __ceph_lookup_mds_session(mdsc, mds);
3686 if (!session)
3687 continue;
3688 mutex_unlock(&mdsc->mutex);
3689 mutex_lock(&session->s_mutex);
3690 __close_session(mdsc, session);
3691 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3692 cleanup_session_requests(mdsc, session);
3693 remove_session_caps(session);
3694 }
3695 mutex_unlock(&session->s_mutex);
3696 ceph_put_mds_session(session);
3697 mutex_lock(&mdsc->mutex);
3698 kick_requests(mdsc, mds);
3699 }
3700 __wake_requests(mdsc, &mdsc->waiting_for_map);
3701 mutex_unlock(&mdsc->mutex);
3702 }
3703
3704 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3705 {
3706 dout("stop\n");
3707 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3708 if (mdsc->mdsmap)
3709 ceph_mdsmap_destroy(mdsc->mdsmap);
3710 kfree(mdsc->sessions);
3711 ceph_caps_finalize(mdsc);
3712 ceph_pool_perm_destroy(mdsc);
3713 }
3714
3715 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3716 {
3717 struct ceph_mds_client *mdsc = fsc->mdsc;
3718
3719 dout("mdsc_destroy %p\n", mdsc);
3720 ceph_mdsc_stop(mdsc);
3721
3722 /* flush out any connection work with references to us */
3723 ceph_msgr_flush();
3724
3725 fsc->mdsc = NULL;
3726 kfree(mdsc);
3727 dout("mdsc_destroy %p done\n", mdsc);
3728 }
3729
3730
3731 /*
3732 * handle mds map update.
3733 */
3734 void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3735 {
3736 u32 epoch;
3737 u32 maplen;
3738 void *p = msg->front.iov_base;
3739 void *end = p + msg->front.iov_len;
3740 struct ceph_mdsmap *newmap, *oldmap;
3741 struct ceph_fsid fsid;
3742 int err = -EINVAL;
3743
3744 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3745 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3746 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3747 return;
3748 epoch = ceph_decode_32(&p);
3749 maplen = ceph_decode_32(&p);
3750 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3751
3752 /* do we need it? */
3753 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
3754 mutex_lock(&mdsc->mutex);
3755 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3756 dout("handle_map epoch %u <= our %u\n",
3757 epoch, mdsc->mdsmap->m_epoch);
3758 mutex_unlock(&mdsc->mutex);
3759 return;
3760 }
3761
3762 newmap = ceph_mdsmap_decode(&p, end);
3763 if (IS_ERR(newmap)) {
3764 err = PTR_ERR(newmap);
3765 goto bad_unlock;
3766 }
3767
3768 /* swap into place */
3769 if (mdsc->mdsmap) {
3770 oldmap = mdsc->mdsmap;
3771 mdsc->mdsmap = newmap;
3772 check_new_map(mdsc, newmap, oldmap);
3773 ceph_mdsmap_destroy(oldmap);
3774 } else {
3775 mdsc->mdsmap = newmap; /* first mds map */
3776 }
3777 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3778
3779 __wake_requests(mdsc, &mdsc->waiting_for_map);
3780
3781 mutex_unlock(&mdsc->mutex);
3782 schedule_delayed(mdsc);
3783 return;
3784
3785 bad_unlock:
3786 mutex_unlock(&mdsc->mutex);
3787 bad:
3788 pr_err("error decoding mdsmap %d\n", err);
3789 return;
3790 }
3791
3792 static struct ceph_connection *con_get(struct ceph_connection *con)
3793 {
3794 struct ceph_mds_session *s = con->private;
3795
3796 if (get_session(s)) {
3797 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3798 return con;
3799 }
3800 dout("mdsc con_get %p FAIL\n", s);
3801 return NULL;
3802 }
3803
3804 static void con_put(struct ceph_connection *con)
3805 {
3806 struct ceph_mds_session *s = con->private;
3807
3808 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
3809 ceph_put_mds_session(s);
3810 }
3811
3812 /*
3813 * if the client is unresponsive for long enough, the mds will kill
3814 * the session entirely.
3815 */
3816 static void peer_reset(struct ceph_connection *con)
3817 {
3818 struct ceph_mds_session *s = con->private;
3819 struct ceph_mds_client *mdsc = s->s_mdsc;
3820
3821 pr_warn("mds%d closed our session\n", s->s_mds);
3822 send_mds_reconnect(mdsc, s);
3823 }
3824
3825 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3826 {
3827 struct ceph_mds_session *s = con->private;
3828 struct ceph_mds_client *mdsc = s->s_mdsc;
3829 int type = le16_to_cpu(msg->hdr.type);
3830
3831 mutex_lock(&mdsc->mutex);
3832 if (__verify_registered_session(mdsc, s) < 0) {
3833 mutex_unlock(&mdsc->mutex);
3834 goto out;
3835 }
3836 mutex_unlock(&mdsc->mutex);
3837
3838 switch (type) {
3839 case CEPH_MSG_MDS_MAP:
3840 ceph_mdsc_handle_map(mdsc, msg);
3841 break;
3842 case CEPH_MSG_CLIENT_SESSION:
3843 handle_session(s, msg);
3844 break;
3845 case CEPH_MSG_CLIENT_REPLY:
3846 handle_reply(s, msg);
3847 break;
3848 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3849 handle_forward(mdsc, s, msg);
3850 break;
3851 case CEPH_MSG_CLIENT_CAPS:
3852 ceph_handle_caps(s, msg);
3853 break;
3854 case CEPH_MSG_CLIENT_SNAP:
3855 ceph_handle_snap(mdsc, s, msg);
3856 break;
3857 case CEPH_MSG_CLIENT_LEASE:
3858 handle_lease(mdsc, s, msg);
3859 break;
3860
3861 default:
3862 pr_err("received unknown message type %d %s\n", type,
3863 ceph_msg_type_name(type));
3864 }
3865 out:
3866 ceph_msg_put(msg);
3867 }
3868
3869 /*
3870 * authentication
3871 */
3872
3873 /*
3874 * Note: returned pointer is the address of a structure that's
3875 * managed separately. Caller must *not* attempt to free it.
3876 */
3877 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
3878 int *proto, int force_new)
3879 {
3880 struct ceph_mds_session *s = con->private;
3881 struct ceph_mds_client *mdsc = s->s_mdsc;
3882 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3883 struct ceph_auth_handshake *auth = &s->s_auth;
3884
3885 if (force_new && auth->authorizer) {
3886 ceph_auth_destroy_authorizer(ac, auth->authorizer);
3887 auth->authorizer = NULL;
3888 }
3889 if (!auth->authorizer) {
3890 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3891 auth);
3892 if (ret)
3893 return ERR_PTR(ret);
3894 } else {
3895 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3896 auth);
3897 if (ret)
3898 return ERR_PTR(ret);
3899 }
3900 *proto = ac->protocol;
3901
3902 return auth;
3903 }
3904
3905
3906 static int verify_authorizer_reply(struct ceph_connection *con, int len)
3907 {
3908 struct ceph_mds_session *s = con->private;
3909 struct ceph_mds_client *mdsc = s->s_mdsc;
3910 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3911
3912 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
3913 }
3914
3915 static int invalidate_authorizer(struct ceph_connection *con)
3916 {
3917 struct ceph_mds_session *s = con->private;
3918 struct ceph_mds_client *mdsc = s->s_mdsc;
3919 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3920
3921 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3922
3923 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
3924 }
3925
3926 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3927 struct ceph_msg_header *hdr, int *skip)
3928 {
3929 struct ceph_msg *msg;
3930 int type = (int) le16_to_cpu(hdr->type);
3931 int front_len = (int) le32_to_cpu(hdr->front_len);
3932
3933 if (con->in_msg)
3934 return con->in_msg;
3935
3936 *skip = 0;
3937 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3938 if (!msg) {
3939 pr_err("unable to allocate msg type %d len %d\n",
3940 type, front_len);
3941 return NULL;
3942 }
3943
3944 return msg;
3945 }
3946
3947 static int mds_sign_message(struct ceph_msg *msg)
3948 {
3949 struct ceph_mds_session *s = msg->con->private;
3950 struct ceph_auth_handshake *auth = &s->s_auth;
3951
3952 return ceph_auth_sign_message(auth, msg);
3953 }
3954
3955 static int mds_check_message_signature(struct ceph_msg *msg)
3956 {
3957 struct ceph_mds_session *s = msg->con->private;
3958 struct ceph_auth_handshake *auth = &s->s_auth;
3959
3960 return ceph_auth_check_message_signature(auth, msg);
3961 }
3962
3963 static const struct ceph_connection_operations mds_con_ops = {
3964 .get = con_get,
3965 .put = con_put,
3966 .dispatch = dispatch,
3967 .get_authorizer = get_authorizer,
3968 .verify_authorizer_reply = verify_authorizer_reply,
3969 .invalidate_authorizer = invalidate_authorizer,
3970 .peer_reset = peer_reset,
3971 .alloc_msg = mds_alloc_msg,
3972 .sign_message = mds_sign_message,
3973 .check_message_signature = mds_check_message_signature,
3974 };
3975
3976 /* eof */
Linux with added FPC-III support