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Linux 4.19.133
[linux/fpc-iii.git] / fs / ceph / mds_client.c
bloba2e903203bf9fbc6904fa93dd85c126cfae29d36
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/fs.h>
5 #include <linux/wait.h>
6 #include <linux/slab.h>
7 #include <linux/gfp.h>
8 #include <linux/sched.h>
9 #include <linux/debugfs.h>
10 #include <linux/seq_file.h>
11 #include <linux/ratelimit.h>
12
13 #include "super.h"
14 #include "mds_client.h"
15
16 #include <linux/ceph/ceph_features.h>
17 #include <linux/ceph/messenger.h>
18 #include <linux/ceph/decode.h>
19 #include <linux/ceph/pagelist.h>
20 #include <linux/ceph/auth.h>
21 #include <linux/ceph/debugfs.h>
22
23 /*
24 * A cluster of MDS (metadata server) daemons is responsible for
25 * managing the file system namespace (the directory hierarchy and
26 * inodes) and for coordinating shared access to storage. Metadata is
27 * partitioning hierarchically across a number of servers, and that
28 * partition varies over time as the cluster adjusts the distribution
29 * in order to balance load.
30 *
31 * The MDS client is primarily responsible to managing synchronous
32 * metadata requests for operations like open, unlink, and so forth.
33 * If there is a MDS failure, we find out about it when we (possibly
34 * request and) receive a new MDS map, and can resubmit affected
35 * requests.
36 *
37 * For the most part, though, we take advantage of a lossless
38 * communications channel to the MDS, and do not need to worry about
39 * timing out or resubmitting requests.
40 *
41 * We maintain a stateful "session" with each MDS we interact with.
42 * Within each session, we sent periodic heartbeat messages to ensure
43 * any capabilities or leases we have been issues remain valid. If
44 * the session times out and goes stale, our leases and capabilities
45 * are no longer valid.
46 */
47
48 struct ceph_reconnect_state {
49 int nr_caps;
50 struct ceph_pagelist *pagelist;
51 unsigned msg_version;
52 };
53
54 static void __wake_requests(struct ceph_mds_client *mdsc,
55 struct list_head *head);
56
57 static const struct ceph_connection_operations mds_con_ops;
58
59
60 /*
61 * mds reply parsing
62 */
63
64 /*
65 * parse individual inode info
66 */
67 static int parse_reply_info_in(void **p, void *end,
68 struct ceph_mds_reply_info_in *info,
69 u64 features)
70 {
71 int err = -EIO;
72
73 info->in = *p;
74 *p += sizeof(struct ceph_mds_reply_inode) +
75 sizeof(*info->in->fragtree.splits) *
76 le32_to_cpu(info->in->fragtree.nsplits);
77
78 ceph_decode_32_safe(p, end, info->symlink_len, bad);
79 ceph_decode_need(p, end, info->symlink_len, bad);
80 info->symlink = *p;
81 *p += info->symlink_len;
82
83 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
84 ceph_decode_copy_safe(p, end, &info->dir_layout,
85 sizeof(info->dir_layout), bad);
86 else
87 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
88
89 ceph_decode_32_safe(p, end, info->xattr_len, bad);
90 ceph_decode_need(p, end, info->xattr_len, bad);
91 info->xattr_data = *p;
92 *p += info->xattr_len;
93
94 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
95 ceph_decode_64_safe(p, end, info->inline_version, bad);
96 ceph_decode_32_safe(p, end, info->inline_len, bad);
97 ceph_decode_need(p, end, info->inline_len, bad);
98 info->inline_data = *p;
99 *p += info->inline_len;
100 } else
101 info->inline_version = CEPH_INLINE_NONE;
102
103 if (features & CEPH_FEATURE_MDS_QUOTA) {
104 u8 struct_v, struct_compat;
105 u32 struct_len;
106
107 /*
108 * both struct_v and struct_compat are expected to be >= 1
109 */
110 ceph_decode_8_safe(p, end, struct_v, bad);
111 ceph_decode_8_safe(p, end, struct_compat, bad);
112 if (!struct_v || !struct_compat)
113 goto bad;
114 ceph_decode_32_safe(p, end, struct_len, bad);
115 ceph_decode_need(p, end, struct_len, bad);
116 ceph_decode_64_safe(p, end, info->max_bytes, bad);
117 ceph_decode_64_safe(p, end, info->max_files, bad);
118 } else {
119 info->max_bytes = 0;
120 info->max_files = 0;
121 }
122
123 info->pool_ns_len = 0;
124 info->pool_ns_data = NULL;
125 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
126 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
127 if (info->pool_ns_len > 0) {
128 ceph_decode_need(p, end, info->pool_ns_len, bad);
129 info->pool_ns_data = *p;
130 *p += info->pool_ns_len;
131 }
132 }
133
134 return 0;
135 bad:
136 return err;
137 }
138
139 /*
140 * parse a normal reply, which may contain a (dir+)dentry and/or a
141 * target inode.
142 */
143 static int parse_reply_info_trace(void **p, void *end,
144 struct ceph_mds_reply_info_parsed *info,
145 u64 features)
146 {
147 int err;
148
149 if (info->head->is_dentry) {
150 err = parse_reply_info_in(p, end, &info->diri, features);
151 if (err < 0)
152 goto out_bad;
153
154 if (unlikely(*p + sizeof(*info->dirfrag) > end))
155 goto bad;
156 info->dirfrag = *p;
157 *p += sizeof(*info->dirfrag) +
158 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
159 if (unlikely(*p > end))
160 goto bad;
161
162 ceph_decode_32_safe(p, end, info->dname_len, bad);
163 ceph_decode_need(p, end, info->dname_len, bad);
164 info->dname = *p;
165 *p += info->dname_len;
166 info->dlease = *p;
167 *p += sizeof(*info->dlease);
168 }
169
170 if (info->head->is_target) {
171 err = parse_reply_info_in(p, end, &info->targeti, features);
172 if (err < 0)
173 goto out_bad;
174 }
175
176 if (unlikely(*p != end))
177 goto bad;
178 return 0;
179
180 bad:
181 err = -EIO;
182 out_bad:
183 pr_err("problem parsing mds trace %d\n", err);
184 return err;
185 }
186
187 /*
188 * parse readdir results
189 */
190 static int parse_reply_info_dir(void **p, void *end,
191 struct ceph_mds_reply_info_parsed *info,
192 u64 features)
193 {
194 u32 num, i = 0;
195 int err;
196
197 info->dir_dir = *p;
198 if (*p + sizeof(*info->dir_dir) > end)
199 goto bad;
200 *p += sizeof(*info->dir_dir) +
201 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
202 if (*p > end)
203 goto bad;
204
205 ceph_decode_need(p, end, sizeof(num) + 2, bad);
206 num = ceph_decode_32(p);
207 {
208 u16 flags = ceph_decode_16(p);
209 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
210 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
211 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
212 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
213 }
214 if (num == 0)
215 goto done;
216
217 BUG_ON(!info->dir_entries);
218 if ((unsigned long)(info->dir_entries + num) >
219 (unsigned long)info->dir_entries + info->dir_buf_size) {
220 pr_err("dir contents are larger than expected\n");
221 WARN_ON(1);
222 goto bad;
223 }
224
225 info->dir_nr = num;
226 while (num) {
227 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
228 /* dentry */
229 ceph_decode_need(p, end, sizeof(u32)*2, bad);
230 rde->name_len = ceph_decode_32(p);
231 ceph_decode_need(p, end, rde->name_len, bad);
232 rde->name = *p;
233 *p += rde->name_len;
234 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
235 rde->lease = *p;
236 *p += sizeof(struct ceph_mds_reply_lease);
237
238 /* inode */
239 err = parse_reply_info_in(p, end, &rde->inode, features);
240 if (err < 0)
241 goto out_bad;
242 /* ceph_readdir_prepopulate() will update it */
243 rde->offset = 0;
244 i++;
245 num--;
246 }
247
248 done:
249 if (*p != end)
250 goto bad;
251 return 0;
252
253 bad:
254 err = -EIO;
255 out_bad:
256 pr_err("problem parsing dir contents %d\n", err);
257 return err;
258 }
259
260 /*
261 * parse fcntl F_GETLK results
262 */
263 static int parse_reply_info_filelock(void **p, void *end,
264 struct ceph_mds_reply_info_parsed *info,
265 u64 features)
266 {
267 if (*p + sizeof(*info->filelock_reply) > end)
268 goto bad;
269
270 info->filelock_reply = *p;
271 *p += sizeof(*info->filelock_reply);
272
273 if (unlikely(*p != end))
274 goto bad;
275 return 0;
276
277 bad:
278 return -EIO;
279 }
280
281 /*
282 * parse create results
283 */
284 static int parse_reply_info_create(void **p, void *end,
285 struct ceph_mds_reply_info_parsed *info,
286 u64 features)
287 {
288 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
289 if (*p == end) {
290 info->has_create_ino = false;
291 } else {
292 info->has_create_ino = true;
293 info->ino = ceph_decode_64(p);
294 }
295 }
296
297 if (unlikely(*p != end))
298 goto bad;
299 return 0;
300
301 bad:
302 return -EIO;
303 }
304
305 /*
306 * parse extra results
307 */
308 static int parse_reply_info_extra(void **p, void *end,
309 struct ceph_mds_reply_info_parsed *info,
310 u64 features)
311 {
312 u32 op = le32_to_cpu(info->head->op);
313
314 if (op == CEPH_MDS_OP_GETFILELOCK)
315 return parse_reply_info_filelock(p, end, info, features);
316 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
317 return parse_reply_info_dir(p, end, info, features);
318 else if (op == CEPH_MDS_OP_CREATE)
319 return parse_reply_info_create(p, end, info, features);
320 else
321 return -EIO;
322 }
323
324 /*
325 * parse entire mds reply
326 */
327 static int parse_reply_info(struct ceph_msg *msg,
328 struct ceph_mds_reply_info_parsed *info,
329 u64 features)
330 {
331 void *p, *end;
332 u32 len;
333 int err;
334
335 info->head = msg->front.iov_base;
336 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
337 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
338
339 /* trace */
340 ceph_decode_32_safe(&p, end, len, bad);
341 if (len > 0) {
342 ceph_decode_need(&p, end, len, bad);
343 err = parse_reply_info_trace(&p, p+len, info, features);
344 if (err < 0)
345 goto out_bad;
346 }
347
348 /* extra */
349 ceph_decode_32_safe(&p, end, len, bad);
350 if (len > 0) {
351 ceph_decode_need(&p, end, len, bad);
352 err = parse_reply_info_extra(&p, p+len, info, features);
353 if (err < 0)
354 goto out_bad;
355 }
356
357 /* snap blob */
358 ceph_decode_32_safe(&p, end, len, bad);
359 info->snapblob_len = len;
360 info->snapblob = p;
361 p += len;
362
363 if (p != end)
364 goto bad;
365 return 0;
366
367 bad:
368 err = -EIO;
369 out_bad:
370 pr_err("mds parse_reply err %d\n", err);
371 return err;
372 }
373
374 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
375 {
376 if (!info->dir_entries)
377 return;
378 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
379 }
380
381
382 /*
383 * sessions
384 */
385 const char *ceph_session_state_name(int s)
386 {
387 switch (s) {
388 case CEPH_MDS_SESSION_NEW: return "new";
389 case CEPH_MDS_SESSION_OPENING: return "opening";
390 case CEPH_MDS_SESSION_OPEN: return "open";
391 case CEPH_MDS_SESSION_HUNG: return "hung";
392 case CEPH_MDS_SESSION_CLOSING: return "closing";
393 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
394 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
395 case CEPH_MDS_SESSION_REJECTED: return "rejected";
396 default: return "???";
397 }
398 }
399
400 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
401 {
402 if (refcount_inc_not_zero(&s->s_ref)) {
403 dout("mdsc get_session %p %d -> %d\n", s,
404 refcount_read(&s->s_ref)-1, refcount_read(&s->s_ref));
405 return s;
406 } else {
407 dout("mdsc get_session %p 0 -- FAIL\n", s);
408 return NULL;
409 }
410 }
411
412 void ceph_put_mds_session(struct ceph_mds_session *s)
413 {
414 dout("mdsc put_session %p %d -> %d\n", s,
415 refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1);
416 if (refcount_dec_and_test(&s->s_ref)) {
417 if (s->s_auth.authorizer)
418 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
419 kfree(s);
420 }
421 }
422
423 /*
424 * called under mdsc->mutex
425 */
426 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
427 int mds)
428 {
429 struct ceph_mds_session *session;
430
431 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
432 return NULL;
433 session = mdsc->sessions[mds];
434 dout("lookup_mds_session %p %d\n", session,
435 refcount_read(&session->s_ref));
436 get_session(session);
437 return session;
438 }
439
440 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
441 {
442 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
443 return false;
444 else
445 return true;
446 }
447
448 static int __verify_registered_session(struct ceph_mds_client *mdsc,
449 struct ceph_mds_session *s)
450 {
451 if (s->s_mds >= mdsc->max_sessions ||
452 mdsc->sessions[s->s_mds] != s)
453 return -ENOENT;
454 return 0;
455 }
456
457 /*
458 * create+register a new session for given mds.
459 * called under mdsc->mutex.
460 */
461 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
462 int mds)
463 {
464 struct ceph_mds_session *s;
465
466 if (mds >= mdsc->mdsmap->m_num_mds)
467 return ERR_PTR(-EINVAL);
468
469 s = kzalloc(sizeof(*s), GFP_NOFS);
470 if (!s)
471 return ERR_PTR(-ENOMEM);
472
473 if (mds >= mdsc->max_sessions) {
474 int newmax = 1 << get_count_order(mds + 1);
475 struct ceph_mds_session **sa;
476
477 dout("%s: realloc to %d\n", __func__, newmax);
478 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
479 if (!sa)
480 goto fail_realloc;
481 if (mdsc->sessions) {
482 memcpy(sa, mdsc->sessions,
483 mdsc->max_sessions * sizeof(void *));
484 kfree(mdsc->sessions);
485 }
486 mdsc->sessions = sa;
487 mdsc->max_sessions = newmax;
488 }
489
490 dout("%s: mds%d\n", __func__, mds);
491 s->s_mdsc = mdsc;
492 s->s_mds = mds;
493 s->s_state = CEPH_MDS_SESSION_NEW;
494 s->s_ttl = 0;
495 s->s_seq = 0;
496 mutex_init(&s->s_mutex);
497
498 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
499
500 spin_lock_init(&s->s_gen_ttl_lock);
501 s->s_cap_gen = 0;
502 s->s_cap_ttl = jiffies - 1;
503
504 spin_lock_init(&s->s_cap_lock);
505 s->s_renew_requested = 0;
506 s->s_renew_seq = 0;
507 INIT_LIST_HEAD(&s->s_caps);
508 s->s_nr_caps = 0;
509 s->s_trim_caps = 0;
510 refcount_set(&s->s_ref, 1);
511 INIT_LIST_HEAD(&s->s_waiting);
512 INIT_LIST_HEAD(&s->s_unsafe);
513 s->s_num_cap_releases = 0;
514 s->s_cap_reconnect = 0;
515 s->s_cap_iterator = NULL;
516 INIT_LIST_HEAD(&s->s_cap_releases);
517 INIT_LIST_HEAD(&s->s_cap_flushing);
518
519 mdsc->sessions[mds] = s;
520 atomic_inc(&mdsc->num_sessions);
521 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
522
523 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
524 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
525
526 return s;
527
528 fail_realloc:
529 kfree(s);
530 return ERR_PTR(-ENOMEM);
531 }
532
533 /*
534 * called under mdsc->mutex
535 */
536 static void __unregister_session(struct ceph_mds_client *mdsc,
537 struct ceph_mds_session *s)
538 {
539 dout("__unregister_session mds%d %p\n", s->s_mds, s);
540 BUG_ON(mdsc->sessions[s->s_mds] != s);
541 mdsc->sessions[s->s_mds] = NULL;
542 ceph_con_close(&s->s_con);
543 ceph_put_mds_session(s);
544 atomic_dec(&mdsc->num_sessions);
545 }
546
547 /*
548 * drop session refs in request.
549 *
550 * should be last request ref, or hold mdsc->mutex
551 */
552 static void put_request_session(struct ceph_mds_request *req)
553 {
554 if (req->r_session) {
555 ceph_put_mds_session(req->r_session);
556 req->r_session = NULL;
557 }
558 }
559
560 void ceph_mdsc_release_request(struct kref *kref)
561 {
562 struct ceph_mds_request *req = container_of(kref,
563 struct ceph_mds_request,
564 r_kref);
565 destroy_reply_info(&req->r_reply_info);
566 if (req->r_request)
567 ceph_msg_put(req->r_request);
568 if (req->r_reply)
569 ceph_msg_put(req->r_reply);
570 if (req->r_inode) {
571 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
572 iput(req->r_inode);
573 }
574 if (req->r_parent)
575 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
576 iput(req->r_target_inode);
577 if (req->r_dentry)
578 dput(req->r_dentry);
579 if (req->r_old_dentry)
580 dput(req->r_old_dentry);
581 if (req->r_old_dentry_dir) {
582 /*
583 * track (and drop pins for) r_old_dentry_dir
584 * separately, since r_old_dentry's d_parent may have
585 * changed between the dir mutex being dropped and
586 * this request being freed.
587 */
588 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
589 CEPH_CAP_PIN);
590 iput(req->r_old_dentry_dir);
591 }
592 kfree(req->r_path1);
593 kfree(req->r_path2);
594 if (req->r_pagelist)
595 ceph_pagelist_release(req->r_pagelist);
596 put_request_session(req);
597 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
598 kfree(req);
599 }
600
601 DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
602
603 /*
604 * lookup session, bump ref if found.
605 *
606 * called under mdsc->mutex.
607 */
608 static struct ceph_mds_request *
609 lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
610 {
611 struct ceph_mds_request *req;
612
613 req = lookup_request(&mdsc->request_tree, tid);
614 if (req)
615 ceph_mdsc_get_request(req);
616
617 return req;
618 }
619
620 /*
621 * Register an in-flight request, and assign a tid. Link to directory
622 * are modifying (if any).
623 *
624 * Called under mdsc->mutex.
625 */
626 static void __register_request(struct ceph_mds_client *mdsc,
627 struct ceph_mds_request *req,
628 struct inode *dir)
629 {
630 int ret = 0;
631
632 req->r_tid = ++mdsc->last_tid;
633 if (req->r_num_caps) {
634 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
635 req->r_num_caps);
636 if (ret < 0) {
637 pr_err("__register_request %p "
638 "failed to reserve caps: %d\n", req, ret);
639 /* set req->r_err to fail early from __do_request */
640 req->r_err = ret;
641 return;
642 }
643 }
644 dout("__register_request %p tid %lld\n", req, req->r_tid);
645 ceph_mdsc_get_request(req);
646 insert_request(&mdsc->request_tree, req);
647
648 req->r_uid = current_fsuid();
649 req->r_gid = current_fsgid();
650
651 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
652 mdsc->oldest_tid = req->r_tid;
653
654 if (dir) {
655 ihold(dir);
656 req->r_unsafe_dir = dir;
657 }
658 }
659
660 static void __unregister_request(struct ceph_mds_client *mdsc,
661 struct ceph_mds_request *req)
662 {
663 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
664
665 /* Never leave an unregistered request on an unsafe list! */
666 list_del_init(&req->r_unsafe_item);
667
668 if (req->r_tid == mdsc->oldest_tid) {
669 struct rb_node *p = rb_next(&req->r_node);
670 mdsc->oldest_tid = 0;
671 while (p) {
672 struct ceph_mds_request *next_req =
673 rb_entry(p, struct ceph_mds_request, r_node);
674 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
675 mdsc->oldest_tid = next_req->r_tid;
676 break;
677 }
678 p = rb_next(p);
679 }
680 }
681
682 erase_request(&mdsc->request_tree, req);
683
684 if (req->r_unsafe_dir &&
685 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
686 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
687 spin_lock(&ci->i_unsafe_lock);
688 list_del_init(&req->r_unsafe_dir_item);
689 spin_unlock(&ci->i_unsafe_lock);
690 }
691 if (req->r_target_inode &&
692 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
693 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
694 spin_lock(&ci->i_unsafe_lock);
695 list_del_init(&req->r_unsafe_target_item);
696 spin_unlock(&ci->i_unsafe_lock);
697 }
698
699 if (req->r_unsafe_dir) {
700 iput(req->r_unsafe_dir);
701 req->r_unsafe_dir = NULL;
702 }
703
704 complete_all(&req->r_safe_completion);
705
706 ceph_mdsc_put_request(req);
707 }
708
709 /*
710 * Walk back up the dentry tree until we hit a dentry representing a
711 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
712 * when calling this) to ensure that the objects won't disappear while we're
713 * working with them. Once we hit a candidate dentry, we attempt to take a
714 * reference to it, and return that as the result.
715 */
716 static struct inode *get_nonsnap_parent(struct dentry *dentry)
717 {
718 struct inode *inode = NULL;
719
720 while (dentry && !IS_ROOT(dentry)) {
721 inode = d_inode_rcu(dentry);
722 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
723 break;
724 dentry = dentry->d_parent;
725 }
726 if (inode)
727 inode = igrab(inode);
728 return inode;
729 }
730
731 /*
732 * Choose mds to send request to next. If there is a hint set in the
733 * request (e.g., due to a prior forward hint from the mds), use that.
734 * Otherwise, consult frag tree and/or caps to identify the
735 * appropriate mds. If all else fails, choose randomly.
736 *
737 * Called under mdsc->mutex.
738 */
739 static int __choose_mds(struct ceph_mds_client *mdsc,
740 struct ceph_mds_request *req)
741 {
742 struct inode *inode;
743 struct ceph_inode_info *ci;
744 struct ceph_cap *cap;
745 int mode = req->r_direct_mode;
746 int mds = -1;
747 u32 hash = req->r_direct_hash;
748 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
749
750 /*
751 * is there a specific mds we should try? ignore hint if we have
752 * no session and the mds is not up (active or recovering).
753 */
754 if (req->r_resend_mds >= 0 &&
755 (__have_session(mdsc, req->r_resend_mds) ||
756 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
757 dout("choose_mds using resend_mds mds%d\n",
758 req->r_resend_mds);
759 return req->r_resend_mds;
760 }
761
762 if (mode == USE_RANDOM_MDS)
763 goto random;
764
765 inode = NULL;
766 if (req->r_inode) {
767 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
768 inode = req->r_inode;
769 ihold(inode);
770 } else {
771 /* req->r_dentry is non-null for LSSNAP request */
772 rcu_read_lock();
773 inode = get_nonsnap_parent(req->r_dentry);
774 rcu_read_unlock();
775 dout("__choose_mds using snapdir's parent %p\n", inode);
776 }
777 } else if (req->r_dentry) {
778 /* ignore race with rename; old or new d_parent is okay */
779 struct dentry *parent;
780 struct inode *dir;
781
782 rcu_read_lock();
783 parent = req->r_dentry->d_parent;
784 dir = req->r_parent ? : d_inode_rcu(parent);
785
786 if (!dir || dir->i_sb != mdsc->fsc->sb) {
787 /* not this fs or parent went negative */
788 inode = d_inode(req->r_dentry);
789 if (inode)
790 ihold(inode);
791 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
792 /* direct snapped/virtual snapdir requests
793 * based on parent dir inode */
794 inode = get_nonsnap_parent(parent);
795 dout("__choose_mds using nonsnap parent %p\n", inode);
796 } else {
797 /* dentry target */
798 inode = d_inode(req->r_dentry);
799 if (!inode || mode == USE_AUTH_MDS) {
800 /* dir + name */
801 inode = igrab(dir);
802 hash = ceph_dentry_hash(dir, req->r_dentry);
803 is_hash = true;
804 } else {
805 ihold(inode);
806 }
807 }
808 rcu_read_unlock();
809 }
810
811 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
812 (int)hash, mode);
813 if (!inode)
814 goto random;
815 ci = ceph_inode(inode);
816
817 if (is_hash && S_ISDIR(inode->i_mode)) {
818 struct ceph_inode_frag frag;
819 int found;
820
821 ceph_choose_frag(ci, hash, &frag, &found);
822 if (found) {
823 if (mode == USE_ANY_MDS && frag.ndist > 0) {
824 u8 r;
825
826 /* choose a random replica */
827 get_random_bytes(&r, 1);
828 r %= frag.ndist;
829 mds = frag.dist[r];
830 dout("choose_mds %p %llx.%llx "
831 "frag %u mds%d (%d/%d)\n",
832 inode, ceph_vinop(inode),
833 frag.frag, mds,
834 (int)r, frag.ndist);
835 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
836 CEPH_MDS_STATE_ACTIVE)
837 goto out;
838 }
839
840 /* since this file/dir wasn't known to be
841 * replicated, then we want to look for the
842 * authoritative mds. */
843 mode = USE_AUTH_MDS;
844 if (frag.mds >= 0) {
845 /* choose auth mds */
846 mds = frag.mds;
847 dout("choose_mds %p %llx.%llx "
848 "frag %u mds%d (auth)\n",
849 inode, ceph_vinop(inode), frag.frag, mds);
850 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
851 CEPH_MDS_STATE_ACTIVE)
852 goto out;
853 }
854 }
855 }
856
857 spin_lock(&ci->i_ceph_lock);
858 cap = NULL;
859 if (mode == USE_AUTH_MDS)
860 cap = ci->i_auth_cap;
861 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
862 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
863 if (!cap) {
864 spin_unlock(&ci->i_ceph_lock);
865 iput(inode);
866 goto random;
867 }
868 mds = cap->session->s_mds;
869 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
870 inode, ceph_vinop(inode), mds,
871 cap == ci->i_auth_cap ? "auth " : "", cap);
872 spin_unlock(&ci->i_ceph_lock);
873 out:
874 iput(inode);
875 return mds;
876
877 random:
878 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
879 dout("choose_mds chose random mds%d\n", mds);
880 return mds;
881 }
882
883
884 /*
885 * session messages
886 */
887 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
888 {
889 struct ceph_msg *msg;
890 struct ceph_mds_session_head *h;
891
892 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
893 false);
894 if (!msg) {
895 pr_err("create_session_msg ENOMEM creating msg\n");
896 return NULL;
897 }
898 h = msg->front.iov_base;
899 h->op = cpu_to_le32(op);
900 h->seq = cpu_to_le64(seq);
901
902 return msg;
903 }
904
905 static void encode_supported_features(void **p, void *end)
906 {
907 static const unsigned char bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
908 static const size_t count = ARRAY_SIZE(bits);
909
910 if (count > 0) {
911 size_t i;
912 size_t size = ((size_t)bits[count - 1] + 64) / 64 * 8;
913
914 BUG_ON(*p + 4 + size > end);
915 ceph_encode_32(p, size);
916 memset(*p, 0, size);
917 for (i = 0; i < count; i++)
918 ((unsigned char*)(*p))[i / 8] |= 1 << (bits[i] % 8);
919 *p += size;
920 } else {
921 BUG_ON(*p + 4 > end);
922 ceph_encode_32(p, 0);
923 }
924 }
925
926 /*
927 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
928 * to include additional client metadata fields.
929 */
930 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
931 {
932 struct ceph_msg *msg;
933 struct ceph_mds_session_head *h;
934 int i = -1;
935 int extra_bytes = 0;
936 int metadata_key_count = 0;
937 struct ceph_options *opt = mdsc->fsc->client->options;
938 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
939 void *p, *end;
940
941 const char* metadata[][2] = {
942 {"hostname", mdsc->nodename},
943 {"kernel_version", init_utsname()->release},
944 {"entity_id", opt->name ? : ""},
945 {"root", fsopt->server_path ? : "/"},
946 {NULL, NULL}
947 };
948
949 /* Calculate serialized length of metadata */
950 extra_bytes = 4; /* map length */
951 for (i = 0; metadata[i][0]; ++i) {
952 extra_bytes += 8 + strlen(metadata[i][0]) +
953 strlen(metadata[i][1]);
954 metadata_key_count++;
955 }
956 /* supported feature */
957 extra_bytes += 4 + 8;
958
959 /* Allocate the message */
960 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
961 GFP_NOFS, false);
962 if (!msg) {
963 pr_err("create_session_msg ENOMEM creating msg\n");
964 return NULL;
965 }
966 p = msg->front.iov_base;
967 end = p + msg->front.iov_len;
968
969 h = p;
970 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
971 h->seq = cpu_to_le64(seq);
972
973 /*
974 * Serialize client metadata into waiting buffer space, using
975 * the format that userspace expects for map<string, string>
976 *
977 * ClientSession messages with metadata are v2
978 */
979 msg->hdr.version = cpu_to_le16(3);
980 msg->hdr.compat_version = cpu_to_le16(1);
981
982 /* The write pointer, following the session_head structure */
983 p += sizeof(*h);
984
985 /* Number of entries in the map */
986 ceph_encode_32(&p, metadata_key_count);
987
988 /* Two length-prefixed strings for each entry in the map */
989 for (i = 0; metadata[i][0]; ++i) {
990 size_t const key_len = strlen(metadata[i][0]);
991 size_t const val_len = strlen(metadata[i][1]);
992
993 ceph_encode_32(&p, key_len);
994 memcpy(p, metadata[i][0], key_len);
995 p += key_len;
996 ceph_encode_32(&p, val_len);
997 memcpy(p, metadata[i][1], val_len);
998 p += val_len;
999 }
1000
1001 encode_supported_features(&p, end);
1002 msg->front.iov_len = p - msg->front.iov_base;
1003 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1004
1005 return msg;
1006 }
1007
1008 /*
1009 * send session open request.
1010 *
1011 * called under mdsc->mutex
1012 */
1013 static int __open_session(struct ceph_mds_client *mdsc,
1014 struct ceph_mds_session *session)
1015 {
1016 struct ceph_msg *msg;
1017 int mstate;
1018 int mds = session->s_mds;
1019
1020 /* wait for mds to go active? */
1021 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
1022 dout("open_session to mds%d (%s)\n", mds,
1023 ceph_mds_state_name(mstate));
1024 session->s_state = CEPH_MDS_SESSION_OPENING;
1025 session->s_renew_requested = jiffies;
1026
1027 /* send connect message */
1028 msg = create_session_open_msg(mdsc, session->s_seq);
1029 if (!msg)
1030 return -ENOMEM;
1031 ceph_con_send(&session->s_con, msg);
1032 return 0;
1033 }
1034
1035 /*
1036 * open sessions for any export targets for the given mds
1037 *
1038 * called under mdsc->mutex
1039 */
1040 static struct ceph_mds_session *
1041 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
1042 {
1043 struct ceph_mds_session *session;
1044
1045 session = __ceph_lookup_mds_session(mdsc, target);
1046 if (!session) {
1047 session = register_session(mdsc, target);
1048 if (IS_ERR(session))
1049 return session;
1050 }
1051 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1052 session->s_state == CEPH_MDS_SESSION_CLOSING)
1053 __open_session(mdsc, session);
1054
1055 return session;
1056 }
1057
1058 struct ceph_mds_session *
1059 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1060 {
1061 struct ceph_mds_session *session;
1062
1063 dout("open_export_target_session to mds%d\n", target);
1064
1065 mutex_lock(&mdsc->mutex);
1066 session = __open_export_target_session(mdsc, target);
1067 mutex_unlock(&mdsc->mutex);
1068
1069 return session;
1070 }
1071
1072 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1073 struct ceph_mds_session *session)
1074 {
1075 struct ceph_mds_info *mi;
1076 struct ceph_mds_session *ts;
1077 int i, mds = session->s_mds;
1078
1079 if (mds >= mdsc->mdsmap->m_num_mds)
1080 return;
1081
1082 mi = &mdsc->mdsmap->m_info[mds];
1083 dout("open_export_target_sessions for mds%d (%d targets)\n",
1084 session->s_mds, mi->num_export_targets);
1085
1086 for (i = 0; i < mi->num_export_targets; i++) {
1087 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1088 if (!IS_ERR(ts))
1089 ceph_put_mds_session(ts);
1090 }
1091 }
1092
1093 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1094 struct ceph_mds_session *session)
1095 {
1096 mutex_lock(&mdsc->mutex);
1097 __open_export_target_sessions(mdsc, session);
1098 mutex_unlock(&mdsc->mutex);
1099 }
1100
1101 /*
1102 * session caps
1103 */
1104
1105 static void detach_cap_releases(struct ceph_mds_session *session,
1106 struct list_head *target)
1107 {
1108 lockdep_assert_held(&session->s_cap_lock);
1109
1110 list_splice_init(&session->s_cap_releases, target);
1111 session->s_num_cap_releases = 0;
1112 dout("dispose_cap_releases mds%d\n", session->s_mds);
1113 }
1114
1115 static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1116 struct list_head *dispose)
1117 {
1118 while (!list_empty(dispose)) {
1119 struct ceph_cap *cap;
1120 /* zero out the in-progress message */
1121 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
1122 list_del(&cap->session_caps);
1123 ceph_put_cap(mdsc, cap);
1124 }
1125 }
1126
1127 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1128 struct ceph_mds_session *session)
1129 {
1130 struct ceph_mds_request *req;
1131 struct rb_node *p;
1132
1133 dout("cleanup_session_requests mds%d\n", session->s_mds);
1134 mutex_lock(&mdsc->mutex);
1135 while (!list_empty(&session->s_unsafe)) {
1136 req = list_first_entry(&session->s_unsafe,
1137 struct ceph_mds_request, r_unsafe_item);
1138 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1139 req->r_tid);
1140 __unregister_request(mdsc, req);
1141 }
1142 /* zero r_attempts, so kick_requests() will re-send requests */
1143 p = rb_first(&mdsc->request_tree);
1144 while (p) {
1145 req = rb_entry(p, struct ceph_mds_request, r_node);
1146 p = rb_next(p);
1147 if (req->r_session &&
1148 req->r_session->s_mds == session->s_mds)
1149 req->r_attempts = 0;
1150 }
1151 mutex_unlock(&mdsc->mutex);
1152 }
1153
1154 /*
1155 * Helper to safely iterate over all caps associated with a session, with
1156 * special care taken to handle a racing __ceph_remove_cap().
1157 *
1158 * Caller must hold session s_mutex.
1159 */
1160 static int iterate_session_caps(struct ceph_mds_session *session,
1161 int (*cb)(struct inode *, struct ceph_cap *,
1162 void *), void *arg)
1163 {
1164 struct list_head *p;
1165 struct ceph_cap *cap;
1166 struct inode *inode, *last_inode = NULL;
1167 struct ceph_cap *old_cap = NULL;
1168 int ret;
1169
1170 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1171 spin_lock(&session->s_cap_lock);
1172 p = session->s_caps.next;
1173 while (p != &session->s_caps) {
1174 cap = list_entry(p, struct ceph_cap, session_caps);
1175 inode = igrab(&cap->ci->vfs_inode);
1176 if (!inode) {
1177 p = p->next;
1178 continue;
1179 }
1180 session->s_cap_iterator = cap;
1181 spin_unlock(&session->s_cap_lock);
1182
1183 if (last_inode) {
1184 iput(last_inode);
1185 last_inode = NULL;
1186 }
1187 if (old_cap) {
1188 ceph_put_cap(session->s_mdsc, old_cap);
1189 old_cap = NULL;
1190 }
1191
1192 ret = cb(inode, cap, arg);
1193 last_inode = inode;
1194
1195 spin_lock(&session->s_cap_lock);
1196 p = p->next;
1197 if (!cap->ci) {
1198 dout("iterate_session_caps finishing cap %p removal\n",
1199 cap);
1200 BUG_ON(cap->session != session);
1201 cap->session = NULL;
1202 list_del_init(&cap->session_caps);
1203 session->s_nr_caps--;
1204 if (cap->queue_release) {
1205 list_add_tail(&cap->session_caps,
1206 &session->s_cap_releases);
1207 session->s_num_cap_releases++;
1208 } else {
1209 old_cap = cap; /* put_cap it w/o locks held */
1210 }
1211 }
1212 if (ret < 0)
1213 goto out;
1214 }
1215 ret = 0;
1216 out:
1217 session->s_cap_iterator = NULL;
1218 spin_unlock(&session->s_cap_lock);
1219
1220 iput(last_inode);
1221 if (old_cap)
1222 ceph_put_cap(session->s_mdsc, old_cap);
1223
1224 return ret;
1225 }
1226
1227 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1228 void *arg)
1229 {
1230 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
1231 struct ceph_inode_info *ci = ceph_inode(inode);
1232 LIST_HEAD(to_remove);
1233 bool drop = false;
1234 bool invalidate = false;
1235
1236 dout("removing cap %p, ci is %p, inode is %p\n",
1237 cap, ci, &ci->vfs_inode);
1238 spin_lock(&ci->i_ceph_lock);
1239 __ceph_remove_cap(cap, false);
1240 if (!ci->i_auth_cap) {
1241 struct ceph_cap_flush *cf;
1242 struct ceph_mds_client *mdsc = fsc->mdsc;
1243
1244 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1245
1246 if (ci->i_wrbuffer_ref > 0 &&
1247 READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
1248 invalidate = true;
1249
1250 while (!list_empty(&ci->i_cap_flush_list)) {
1251 cf = list_first_entry(&ci->i_cap_flush_list,
1252 struct ceph_cap_flush, i_list);
1253 list_move(&cf->i_list, &to_remove);
1254 }
1255
1256 spin_lock(&mdsc->cap_dirty_lock);
1257
1258 list_for_each_entry(cf, &to_remove, i_list)
1259 list_del(&cf->g_list);
1260
1261 if (!list_empty(&ci->i_dirty_item)) {
1262 pr_warn_ratelimited(
1263 " dropping dirty %s state for %p %lld\n",
1264 ceph_cap_string(ci->i_dirty_caps),
1265 inode, ceph_ino(inode));
1266 ci->i_dirty_caps = 0;
1267 list_del_init(&ci->i_dirty_item);
1268 drop = true;
1269 }
1270 if (!list_empty(&ci->i_flushing_item)) {
1271 pr_warn_ratelimited(
1272 " dropping dirty+flushing %s state for %p %lld\n",
1273 ceph_cap_string(ci->i_flushing_caps),
1274 inode, ceph_ino(inode));
1275 ci->i_flushing_caps = 0;
1276 list_del_init(&ci->i_flushing_item);
1277 mdsc->num_cap_flushing--;
1278 drop = true;
1279 }
1280 spin_unlock(&mdsc->cap_dirty_lock);
1281
1282 if (atomic_read(&ci->i_filelock_ref) > 0) {
1283 /* make further file lock syscall return -EIO */
1284 ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
1285 pr_warn_ratelimited(" dropping file locks for %p %lld\n",
1286 inode, ceph_ino(inode));
1287 }
1288
1289 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1290 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
1291 ci->i_prealloc_cap_flush = NULL;
1292 }
1293
1294 if (drop &&
1295 ci->i_wrbuffer_ref_head == 0 &&
1296 ci->i_wr_ref == 0 &&
1297 ci->i_dirty_caps == 0 &&
1298 ci->i_flushing_caps == 0) {
1299 ceph_put_snap_context(ci->i_head_snapc);
1300 ci->i_head_snapc = NULL;
1301 }
1302 }
1303 spin_unlock(&ci->i_ceph_lock);
1304 while (!list_empty(&to_remove)) {
1305 struct ceph_cap_flush *cf;
1306 cf = list_first_entry(&to_remove,
1307 struct ceph_cap_flush, i_list);
1308 list_del(&cf->i_list);
1309 ceph_free_cap_flush(cf);
1310 }
1311
1312 wake_up_all(&ci->i_cap_wq);
1313 if (invalidate)
1314 ceph_queue_invalidate(inode);
1315 if (drop)
1316 iput(inode);
1317 return 0;
1318 }
1319
1320 /*
1321 * caller must hold session s_mutex
1322 */
1323 static void remove_session_caps(struct ceph_mds_session *session)
1324 {
1325 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1326 struct super_block *sb = fsc->sb;
1327 LIST_HEAD(dispose);
1328
1329 dout("remove_session_caps on %p\n", session);
1330 iterate_session_caps(session, remove_session_caps_cb, fsc);
1331
1332 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1333
1334 spin_lock(&session->s_cap_lock);
1335 if (session->s_nr_caps > 0) {
1336 struct inode *inode;
1337 struct ceph_cap *cap, *prev = NULL;
1338 struct ceph_vino vino;
1339 /*
1340 * iterate_session_caps() skips inodes that are being
1341 * deleted, we need to wait until deletions are complete.
1342 * __wait_on_freeing_inode() is designed for the job,
1343 * but it is not exported, so use lookup inode function
1344 * to access it.
1345 */
1346 while (!list_empty(&session->s_caps)) {
1347 cap = list_entry(session->s_caps.next,
1348 struct ceph_cap, session_caps);
1349 if (cap == prev)
1350 break;
1351 prev = cap;
1352 vino = cap->ci->i_vino;
1353 spin_unlock(&session->s_cap_lock);
1354
1355 inode = ceph_find_inode(sb, vino);
1356 iput(inode);
1357
1358 spin_lock(&session->s_cap_lock);
1359 }
1360 }
1361
1362 // drop cap expires and unlock s_cap_lock
1363 detach_cap_releases(session, &dispose);
1364
1365 BUG_ON(session->s_nr_caps > 0);
1366 BUG_ON(!list_empty(&session->s_cap_flushing));
1367 spin_unlock(&session->s_cap_lock);
1368 dispose_cap_releases(session->s_mdsc, &dispose);
1369 }
1370
1371 /*
1372 * wake up any threads waiting on this session's caps. if the cap is
1373 * old (didn't get renewed on the client reconnect), remove it now.
1374 *
1375 * caller must hold s_mutex.
1376 */
1377 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1378 void *arg)
1379 {
1380 struct ceph_inode_info *ci = ceph_inode(inode);
1381
1382 if (arg) {
1383 spin_lock(&ci->i_ceph_lock);
1384 ci->i_wanted_max_size = 0;
1385 ci->i_requested_max_size = 0;
1386 spin_unlock(&ci->i_ceph_lock);
1387 }
1388 wake_up_all(&ci->i_cap_wq);
1389 return 0;
1390 }
1391
1392 static void wake_up_session_caps(struct ceph_mds_session *session,
1393 int reconnect)
1394 {
1395 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1396 iterate_session_caps(session, wake_up_session_cb,
1397 (void *)(unsigned long)reconnect);
1398 }
1399
1400 /*
1401 * Send periodic message to MDS renewing all currently held caps. The
1402 * ack will reset the expiration for all caps from this session.
1403 *
1404 * caller holds s_mutex
1405 */
1406 static int send_renew_caps(struct ceph_mds_client *mdsc,
1407 struct ceph_mds_session *session)
1408 {
1409 struct ceph_msg *msg;
1410 int state;
1411
1412 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1413 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1414 pr_info("mds%d caps stale\n", session->s_mds);
1415 session->s_renew_requested = jiffies;
1416
1417 /* do not try to renew caps until a recovering mds has reconnected
1418 * with its clients. */
1419 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1420 if (state < CEPH_MDS_STATE_RECONNECT) {
1421 dout("send_renew_caps ignoring mds%d (%s)\n",
1422 session->s_mds, ceph_mds_state_name(state));
1423 return 0;
1424 }
1425
1426 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1427 ceph_mds_state_name(state));
1428 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1429 ++session->s_renew_seq);
1430 if (!msg)
1431 return -ENOMEM;
1432 ceph_con_send(&session->s_con, msg);
1433 return 0;
1434 }
1435
1436 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1437 struct ceph_mds_session *session, u64 seq)
1438 {
1439 struct ceph_msg *msg;
1440
1441 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1442 session->s_mds, ceph_session_state_name(session->s_state), seq);
1443 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1444 if (!msg)
1445 return -ENOMEM;
1446 ceph_con_send(&session->s_con, msg);
1447 return 0;
1448 }
1449
1450
1451 /*
1452 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1453 *
1454 * Called under session->s_mutex
1455 */
1456 static void renewed_caps(struct ceph_mds_client *mdsc,
1457 struct ceph_mds_session *session, int is_renew)
1458 {
1459 int was_stale;
1460 int wake = 0;
1461
1462 spin_lock(&session->s_cap_lock);
1463 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1464
1465 session->s_cap_ttl = session->s_renew_requested +
1466 mdsc->mdsmap->m_session_timeout*HZ;
1467
1468 if (was_stale) {
1469 if (time_before(jiffies, session->s_cap_ttl)) {
1470 pr_info("mds%d caps renewed\n", session->s_mds);
1471 wake = 1;
1472 } else {
1473 pr_info("mds%d caps still stale\n", session->s_mds);
1474 }
1475 }
1476 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1477 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1478 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1479 spin_unlock(&session->s_cap_lock);
1480
1481 if (wake)
1482 wake_up_session_caps(session, 0);
1483 }
1484
1485 /*
1486 * send a session close request
1487 */
1488 static int request_close_session(struct ceph_mds_client *mdsc,
1489 struct ceph_mds_session *session)
1490 {
1491 struct ceph_msg *msg;
1492
1493 dout("request_close_session mds%d state %s seq %lld\n",
1494 session->s_mds, ceph_session_state_name(session->s_state),
1495 session->s_seq);
1496 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1497 if (!msg)
1498 return -ENOMEM;
1499 ceph_con_send(&session->s_con, msg);
1500 return 1;
1501 }
1502
1503 /*
1504 * Called with s_mutex held.
1505 */
1506 static int __close_session(struct ceph_mds_client *mdsc,
1507 struct ceph_mds_session *session)
1508 {
1509 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1510 return 0;
1511 session->s_state = CEPH_MDS_SESSION_CLOSING;
1512 return request_close_session(mdsc, session);
1513 }
1514
1515 static bool drop_negative_children(struct dentry *dentry)
1516 {
1517 struct dentry *child;
1518 bool all_negative = true;
1519
1520 if (!d_is_dir(dentry))
1521 goto out;
1522
1523 spin_lock(&dentry->d_lock);
1524 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
1525 if (d_really_is_positive(child)) {
1526 all_negative = false;
1527 break;
1528 }
1529 }
1530 spin_unlock(&dentry->d_lock);
1531
1532 if (all_negative)
1533 shrink_dcache_parent(dentry);
1534 out:
1535 return all_negative;
1536 }
1537
1538 /*
1539 * Trim old(er) caps.
1540 *
1541 * Because we can't cache an inode without one or more caps, we do
1542 * this indirectly: if a cap is unused, we prune its aliases, at which
1543 * point the inode will hopefully get dropped to.
1544 *
1545 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1546 * memory pressure from the MDS, though, so it needn't be perfect.
1547 */
1548 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1549 {
1550 struct ceph_mds_session *session = arg;
1551 struct ceph_inode_info *ci = ceph_inode(inode);
1552 int used, wanted, oissued, mine;
1553
1554 if (session->s_trim_caps <= 0)
1555 return -1;
1556
1557 spin_lock(&ci->i_ceph_lock);
1558 mine = cap->issued | cap->implemented;
1559 used = __ceph_caps_used(ci);
1560 wanted = __ceph_caps_file_wanted(ci);
1561 oissued = __ceph_caps_issued_other(ci, cap);
1562
1563 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1564 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1565 ceph_cap_string(used), ceph_cap_string(wanted));
1566 if (cap == ci->i_auth_cap) {
1567 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1568 !list_empty(&ci->i_cap_snaps))
1569 goto out;
1570 if ((used | wanted) & CEPH_CAP_ANY_WR)
1571 goto out;
1572 /* Note: it's possible that i_filelock_ref becomes non-zero
1573 * after dropping auth caps. It doesn't hurt because reply
1574 * of lock mds request will re-add auth caps. */
1575 if (atomic_read(&ci->i_filelock_ref) > 0)
1576 goto out;
1577 }
1578 /* The inode has cached pages, but it's no longer used.
1579 * we can safely drop it */
1580 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1581 !(oissued & CEPH_CAP_FILE_CACHE)) {
1582 used = 0;
1583 oissued = 0;
1584 }
1585 if ((used | wanted) & ~oissued & mine)
1586 goto out; /* we need these caps */
1587
1588 if (oissued) {
1589 /* we aren't the only cap.. just remove us */
1590 __ceph_remove_cap(cap, true);
1591 session->s_trim_caps--;
1592 } else {
1593 struct dentry *dentry;
1594 /* try dropping referring dentries */
1595 spin_unlock(&ci->i_ceph_lock);
1596 dentry = d_find_any_alias(inode);
1597 if (dentry && drop_negative_children(dentry)) {
1598 int count;
1599 dput(dentry);
1600 d_prune_aliases(inode);
1601 count = atomic_read(&inode->i_count);
1602 if (count == 1)
1603 session->s_trim_caps--;
1604 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1605 inode, cap, count);
1606 } else {
1607 dput(dentry);
1608 }
1609 return 0;
1610 }
1611
1612 out:
1613 spin_unlock(&ci->i_ceph_lock);
1614 return 0;
1615 }
1616
1617 /*
1618 * Trim session cap count down to some max number.
1619 */
1620 int ceph_trim_caps(struct ceph_mds_client *mdsc,
1621 struct ceph_mds_session *session,
1622 int max_caps)
1623 {
1624 int trim_caps = session->s_nr_caps - max_caps;
1625
1626 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1627 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1628 if (trim_caps > 0) {
1629 session->s_trim_caps = trim_caps;
1630 iterate_session_caps(session, trim_caps_cb, session);
1631 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1632 session->s_mds, session->s_nr_caps, max_caps,
1633 trim_caps - session->s_trim_caps);
1634 session->s_trim_caps = 0;
1635 }
1636
1637 ceph_send_cap_releases(mdsc, session);
1638 return 0;
1639 }
1640
1641 static int check_caps_flush(struct ceph_mds_client *mdsc,
1642 u64 want_flush_tid)
1643 {
1644 int ret = 1;
1645
1646 spin_lock(&mdsc->cap_dirty_lock);
1647 if (!list_empty(&mdsc->cap_flush_list)) {
1648 struct ceph_cap_flush *cf =
1649 list_first_entry(&mdsc->cap_flush_list,
1650 struct ceph_cap_flush, g_list);
1651 if (cf->tid <= want_flush_tid) {
1652 dout("check_caps_flush still flushing tid "
1653 "%llu <= %llu\n", cf->tid, want_flush_tid);
1654 ret = 0;
1655 }
1656 }
1657 spin_unlock(&mdsc->cap_dirty_lock);
1658 return ret;
1659 }
1660
1661 /*
1662 * flush all dirty inode data to disk.
1663 *
1664 * returns true if we've flushed through want_flush_tid
1665 */
1666 static void wait_caps_flush(struct ceph_mds_client *mdsc,
1667 u64 want_flush_tid)
1668 {
1669 dout("check_caps_flush want %llu\n", want_flush_tid);
1670
1671 wait_event(mdsc->cap_flushing_wq,
1672 check_caps_flush(mdsc, want_flush_tid));
1673
1674 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
1675 }
1676
1677 /*
1678 * called under s_mutex
1679 */
1680 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1681 struct ceph_mds_session *session)
1682 {
1683 struct ceph_msg *msg = NULL;
1684 struct ceph_mds_cap_release *head;
1685 struct ceph_mds_cap_item *item;
1686 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
1687 struct ceph_cap *cap;
1688 LIST_HEAD(tmp_list);
1689 int num_cap_releases;
1690 __le32 barrier, *cap_barrier;
1691
1692 down_read(&osdc->lock);
1693 barrier = cpu_to_le32(osdc->epoch_barrier);
1694 up_read(&osdc->lock);
1695
1696 spin_lock(&session->s_cap_lock);
1697 again:
1698 list_splice_init(&session->s_cap_releases, &tmp_list);
1699 num_cap_releases = session->s_num_cap_releases;
1700 session->s_num_cap_releases = 0;
1701 spin_unlock(&session->s_cap_lock);
1702
1703 while (!list_empty(&tmp_list)) {
1704 if (!msg) {
1705 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1706 PAGE_SIZE, GFP_NOFS, false);
1707 if (!msg)
1708 goto out_err;
1709 head = msg->front.iov_base;
1710 head->num = cpu_to_le32(0);
1711 msg->front.iov_len = sizeof(*head);
1712
1713 msg->hdr.version = cpu_to_le16(2);
1714 msg->hdr.compat_version = cpu_to_le16(1);
1715 }
1716
1717 cap = list_first_entry(&tmp_list, struct ceph_cap,
1718 session_caps);
1719 list_del(&cap->session_caps);
1720 num_cap_releases--;
1721
1722 head = msg->front.iov_base;
1723 le32_add_cpu(&head->num, 1);
1724 item = msg->front.iov_base + msg->front.iov_len;
1725 item->ino = cpu_to_le64(cap->cap_ino);
1726 item->cap_id = cpu_to_le64(cap->cap_id);
1727 item->migrate_seq = cpu_to_le32(cap->mseq);
1728 item->seq = cpu_to_le32(cap->issue_seq);
1729 msg->front.iov_len += sizeof(*item);
1730
1731 ceph_put_cap(mdsc, cap);
1732
1733 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1734 // Append cap_barrier field
1735 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1736 *cap_barrier = barrier;
1737 msg->front.iov_len += sizeof(*cap_barrier);
1738
1739 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1740 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1741 ceph_con_send(&session->s_con, msg);
1742 msg = NULL;
1743 }
1744 }
1745
1746 BUG_ON(num_cap_releases != 0);
1747
1748 spin_lock(&session->s_cap_lock);
1749 if (!list_empty(&session->s_cap_releases))
1750 goto again;
1751 spin_unlock(&session->s_cap_lock);
1752
1753 if (msg) {
1754 // Append cap_barrier field
1755 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1756 *cap_barrier = barrier;
1757 msg->front.iov_len += sizeof(*cap_barrier);
1758
1759 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1760 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1761 ceph_con_send(&session->s_con, msg);
1762 }
1763 return;
1764 out_err:
1765 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1766 session->s_mds);
1767 spin_lock(&session->s_cap_lock);
1768 list_splice(&tmp_list, &session->s_cap_releases);
1769 session->s_num_cap_releases += num_cap_releases;
1770 spin_unlock(&session->s_cap_lock);
1771 }
1772
1773 /*
1774 * requests
1775 */
1776
1777 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1778 struct inode *dir)
1779 {
1780 struct ceph_inode_info *ci = ceph_inode(dir);
1781 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1782 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1783 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
1784 int order, num_entries;
1785
1786 spin_lock(&ci->i_ceph_lock);
1787 num_entries = ci->i_files + ci->i_subdirs;
1788 spin_unlock(&ci->i_ceph_lock);
1789 num_entries = max(num_entries, 1);
1790 num_entries = min(num_entries, opt->max_readdir);
1791
1792 order = get_order(size * num_entries);
1793 while (order >= 0) {
1794 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
1795 __GFP_NOWARN,
1796 order);
1797 if (rinfo->dir_entries)
1798 break;
1799 order--;
1800 }
1801 if (!rinfo->dir_entries)
1802 return -ENOMEM;
1803
1804 num_entries = (PAGE_SIZE << order) / size;
1805 num_entries = min(num_entries, opt->max_readdir);
1806
1807 rinfo->dir_buf_size = PAGE_SIZE << order;
1808 req->r_num_caps = num_entries + 1;
1809 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1810 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1811 return 0;
1812 }
1813
1814 /*
1815 * Create an mds request.
1816 */
1817 struct ceph_mds_request *
1818 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1819 {
1820 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1821 struct timespec64 ts;
1822
1823 if (!req)
1824 return ERR_PTR(-ENOMEM);
1825
1826 mutex_init(&req->r_fill_mutex);
1827 req->r_mdsc = mdsc;
1828 req->r_started = jiffies;
1829 req->r_resend_mds = -1;
1830 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1831 INIT_LIST_HEAD(&req->r_unsafe_target_item);
1832 req->r_fmode = -1;
1833 kref_init(&req->r_kref);
1834 RB_CLEAR_NODE(&req->r_node);
1835 INIT_LIST_HEAD(&req->r_wait);
1836 init_completion(&req->r_completion);
1837 init_completion(&req->r_safe_completion);
1838 INIT_LIST_HEAD(&req->r_unsafe_item);
1839
1840 ktime_get_coarse_real_ts64(&ts);
1841 req->r_stamp = timespec64_trunc(ts, mdsc->fsc->sb->s_time_gran);
1842
1843 req->r_op = op;
1844 req->r_direct_mode = mode;
1845 return req;
1846 }
1847
1848 /*
1849 * return oldest (lowest) request, tid in request tree, 0 if none.
1850 *
1851 * called under mdsc->mutex.
1852 */
1853 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1854 {
1855 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1856 return NULL;
1857 return rb_entry(rb_first(&mdsc->request_tree),
1858 struct ceph_mds_request, r_node);
1859 }
1860
1861 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1862 {
1863 return mdsc->oldest_tid;
1864 }
1865
1866 /*
1867 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1868 * on build_path_from_dentry in fs/cifs/dir.c.
1869 *
1870 * If @stop_on_nosnap, generate path relative to the first non-snapped
1871 * inode.
1872 *
1873 * Encode hidden .snap dirs as a double /, i.e.
1874 * foo/.snap/bar -> foo//bar
1875 */
1876 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1877 int stop_on_nosnap)
1878 {
1879 struct dentry *temp;
1880 char *path;
1881 int len, pos;
1882 unsigned seq;
1883
1884 if (!dentry)
1885 return ERR_PTR(-EINVAL);
1886
1887 retry:
1888 len = 0;
1889 seq = read_seqbegin(&rename_lock);
1890 rcu_read_lock();
1891 for (temp = dentry; !IS_ROOT(temp);) {
1892 struct inode *inode = d_inode(temp);
1893 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1894 len++; /* slash only */
1895 else if (stop_on_nosnap && inode &&
1896 ceph_snap(inode) == CEPH_NOSNAP)
1897 break;
1898 else
1899 len += 1 + temp->d_name.len;
1900 temp = temp->d_parent;
1901 }
1902 rcu_read_unlock();
1903 if (len)
1904 len--; /* no leading '/' */
1905
1906 path = kmalloc(len+1, GFP_NOFS);
1907 if (!path)
1908 return ERR_PTR(-ENOMEM);
1909 pos = len;
1910 path[pos] = 0; /* trailing null */
1911 rcu_read_lock();
1912 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1913 struct inode *inode;
1914
1915 spin_lock(&temp->d_lock);
1916 inode = d_inode(temp);
1917 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1918 dout("build_path path+%d: %p SNAPDIR\n",
1919 pos, temp);
1920 } else if (stop_on_nosnap && inode &&
1921 ceph_snap(inode) == CEPH_NOSNAP) {
1922 spin_unlock(&temp->d_lock);
1923 break;
1924 } else {
1925 pos -= temp->d_name.len;
1926 if (pos < 0) {
1927 spin_unlock(&temp->d_lock);
1928 break;
1929 }
1930 strncpy(path + pos, temp->d_name.name,
1931 temp->d_name.len);
1932 }
1933 spin_unlock(&temp->d_lock);
1934 if (pos)
1935 path[--pos] = '/';
1936 temp = temp->d_parent;
1937 }
1938 rcu_read_unlock();
1939 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1940 pr_err("build_path did not end path lookup where "
1941 "expected, namelen is %d, pos is %d\n", len, pos);
1942 /* presumably this is only possible if racing with a
1943 rename of one of the parent directories (we can not
1944 lock the dentries above us to prevent this, but
1945 retrying should be harmless) */
1946 kfree(path);
1947 goto retry;
1948 }
1949
1950 *base = ceph_ino(d_inode(temp));
1951 *plen = len;
1952 dout("build_path on %p %d built %llx '%.*s'\n",
1953 dentry, d_count(dentry), *base, len, path);
1954 return path;
1955 }
1956
1957 /* Duplicate the dentry->d_name.name safely */
1958 static int clone_dentry_name(struct dentry *dentry, const char **ppath,
1959 int *ppathlen)
1960 {
1961 u32 len;
1962 char *name;
1963
1964 retry:
1965 len = READ_ONCE(dentry->d_name.len);
1966 name = kmalloc(len + 1, GFP_NOFS);
1967 if (!name)
1968 return -ENOMEM;
1969
1970 spin_lock(&dentry->d_lock);
1971 if (dentry->d_name.len != len) {
1972 spin_unlock(&dentry->d_lock);
1973 kfree(name);
1974 goto retry;
1975 }
1976 memcpy(name, dentry->d_name.name, len);
1977 spin_unlock(&dentry->d_lock);
1978
1979 name[len] = '\0';
1980 *ppath = name;
1981 *ppathlen = len;
1982 return 0;
1983 }
1984
1985 static int build_dentry_path(struct dentry *dentry, struct inode *dir,
1986 const char **ppath, int *ppathlen, u64 *pino,
1987 bool *pfreepath, bool parent_locked)
1988 {
1989 int ret;
1990 char *path;
1991
1992 rcu_read_lock();
1993 if (!dir)
1994 dir = d_inode_rcu(dentry->d_parent);
1995 if (dir && ceph_snap(dir) == CEPH_NOSNAP) {
1996 *pino = ceph_ino(dir);
1997 rcu_read_unlock();
1998 if (parent_locked) {
1999 *ppath = dentry->d_name.name;
2000 *ppathlen = dentry->d_name.len;
2001 } else {
2002 ret = clone_dentry_name(dentry, ppath, ppathlen);
2003 if (ret)
2004 return ret;
2005 *pfreepath = true;
2006 }
2007 return 0;
2008 }
2009 rcu_read_unlock();
2010 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2011 if (IS_ERR(path))
2012 return PTR_ERR(path);
2013 *ppath = path;
2014 *pfreepath = true;
2015 return 0;
2016 }
2017
2018 static int build_inode_path(struct inode *inode,
2019 const char **ppath, int *ppathlen, u64 *pino,
2020 bool *pfreepath)
2021 {
2022 struct dentry *dentry;
2023 char *path;
2024
2025 if (ceph_snap(inode) == CEPH_NOSNAP) {
2026 *pino = ceph_ino(inode);
2027 *ppathlen = 0;
2028 return 0;
2029 }
2030 dentry = d_find_alias(inode);
2031 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2032 dput(dentry);
2033 if (IS_ERR(path))
2034 return PTR_ERR(path);
2035 *ppath = path;
2036 *pfreepath = true;
2037 return 0;
2038 }
2039
2040 /*
2041 * request arguments may be specified via an inode *, a dentry *, or
2042 * an explicit ino+path.
2043 */
2044 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
2045 struct inode *rdiri, const char *rpath,
2046 u64 rino, const char **ppath, int *pathlen,
2047 u64 *ino, bool *freepath, bool parent_locked)
2048 {
2049 int r = 0;
2050
2051 if (rinode) {
2052 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2053 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2054 ceph_snap(rinode));
2055 } else if (rdentry) {
2056 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
2057 freepath, parent_locked);
2058 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
2059 *ppath);
2060 } else if (rpath || rino) {
2061 *ino = rino;
2062 *ppath = rpath;
2063 *pathlen = rpath ? strlen(rpath) : 0;
2064 dout(" path %.*s\n", *pathlen, rpath);
2065 }
2066
2067 return r;
2068 }
2069
2070 /*
2071 * called under mdsc->mutex
2072 */
2073 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
2074 struct ceph_mds_request *req,
2075 int mds, bool drop_cap_releases)
2076 {
2077 struct ceph_msg *msg;
2078 struct ceph_mds_request_head *head;
2079 const char *path1 = NULL;
2080 const char *path2 = NULL;
2081 u64 ino1 = 0, ino2 = 0;
2082 int pathlen1 = 0, pathlen2 = 0;
2083 bool freepath1 = false, freepath2 = false;
2084 int len;
2085 u16 releases;
2086 void *p, *end;
2087 int ret;
2088
2089 ret = set_request_path_attr(req->r_inode, req->r_dentry,
2090 req->r_parent, req->r_path1, req->r_ino1.ino,
2091 &path1, &pathlen1, &ino1, &freepath1,
2092 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2093 &req->r_req_flags));
2094 if (ret < 0) {
2095 msg = ERR_PTR(ret);
2096 goto out;
2097 }
2098
2099 /* If r_old_dentry is set, then assume that its parent is locked */
2100 ret = set_request_path_attr(NULL, req->r_old_dentry,
2101 req->r_old_dentry_dir,
2102 req->r_path2, req->r_ino2.ino,
2103 &path2, &pathlen2, &ino2, &freepath2, true);
2104 if (ret < 0) {
2105 msg = ERR_PTR(ret);
2106 goto out_free1;
2107 }
2108
2109 len = sizeof(*head) +
2110 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
2111 sizeof(struct ceph_timespec);
2112
2113 /* calculate (max) length for cap releases */
2114 len += sizeof(struct ceph_mds_request_release) *
2115 (!!req->r_inode_drop + !!req->r_dentry_drop +
2116 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
2117 if (req->r_dentry_drop)
2118 len += req->r_dentry->d_name.len;
2119 if (req->r_old_dentry_drop)
2120 len += req->r_old_dentry->d_name.len;
2121
2122 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
2123 if (!msg) {
2124 msg = ERR_PTR(-ENOMEM);
2125 goto out_free2;
2126 }
2127
2128 msg->hdr.version = cpu_to_le16(2);
2129 msg->hdr.tid = cpu_to_le64(req->r_tid);
2130
2131 head = msg->front.iov_base;
2132 p = msg->front.iov_base + sizeof(*head);
2133 end = msg->front.iov_base + msg->front.iov_len;
2134
2135 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
2136 head->op = cpu_to_le32(req->r_op);
2137 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
2138 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2139 head->args = req->r_args;
2140
2141 ceph_encode_filepath(&p, end, ino1, path1);
2142 ceph_encode_filepath(&p, end, ino2, path2);
2143
2144 /* make note of release offset, in case we need to replay */
2145 req->r_request_release_offset = p - msg->front.iov_base;
2146
2147 /* cap releases */
2148 releases = 0;
2149 if (req->r_inode_drop)
2150 releases += ceph_encode_inode_release(&p,
2151 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2152 mds, req->r_inode_drop, req->r_inode_unless, 0);
2153 if (req->r_dentry_drop)
2154 releases += ceph_encode_dentry_release(&p, req->r_dentry,
2155 req->r_parent, mds, req->r_dentry_drop,
2156 req->r_dentry_unless);
2157 if (req->r_old_dentry_drop)
2158 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
2159 req->r_old_dentry_dir, mds,
2160 req->r_old_dentry_drop,
2161 req->r_old_dentry_unless);
2162 if (req->r_old_inode_drop)
2163 releases += ceph_encode_inode_release(&p,
2164 d_inode(req->r_old_dentry),
2165 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
2166
2167 if (drop_cap_releases) {
2168 releases = 0;
2169 p = msg->front.iov_base + req->r_request_release_offset;
2170 }
2171
2172 head->num_releases = cpu_to_le16(releases);
2173
2174 /* time stamp */
2175 {
2176 struct ceph_timespec ts;
2177 ceph_encode_timespec64(&ts, &req->r_stamp);
2178 ceph_encode_copy(&p, &ts, sizeof(ts));
2179 }
2180
2181 BUG_ON(p > end);
2182 msg->front.iov_len = p - msg->front.iov_base;
2183 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2184
2185 if (req->r_pagelist) {
2186 struct ceph_pagelist *pagelist = req->r_pagelist;
2187 refcount_inc(&pagelist->refcnt);
2188 ceph_msg_data_add_pagelist(msg, pagelist);
2189 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2190 } else {
2191 msg->hdr.data_len = 0;
2192 }
2193
2194 msg->hdr.data_off = cpu_to_le16(0);
2195
2196 out_free2:
2197 if (freepath2)
2198 kfree((char *)path2);
2199 out_free1:
2200 if (freepath1)
2201 kfree((char *)path1);
2202 out:
2203 return msg;
2204 }
2205
2206 /*
2207 * called under mdsc->mutex if error, under no mutex if
2208 * success.
2209 */
2210 static void complete_request(struct ceph_mds_client *mdsc,
2211 struct ceph_mds_request *req)
2212 {
2213 if (req->r_callback)
2214 req->r_callback(mdsc, req);
2215 else
2216 complete_all(&req->r_completion);
2217 }
2218
2219 /*
2220 * called under mdsc->mutex
2221 */
2222 static int __prepare_send_request(struct ceph_mds_client *mdsc,
2223 struct ceph_mds_request *req,
2224 int mds, bool drop_cap_releases)
2225 {
2226 struct ceph_mds_request_head *rhead;
2227 struct ceph_msg *msg;
2228 int flags = 0;
2229
2230 req->r_attempts++;
2231 if (req->r_inode) {
2232 struct ceph_cap *cap =
2233 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2234
2235 if (cap)
2236 req->r_sent_on_mseq = cap->mseq;
2237 else
2238 req->r_sent_on_mseq = -1;
2239 }
2240 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2241 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2242
2243 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2244 void *p;
2245 /*
2246 * Replay. Do not regenerate message (and rebuild
2247 * paths, etc.); just use the original message.
2248 * Rebuilding paths will break for renames because
2249 * d_move mangles the src name.
2250 */
2251 msg = req->r_request;
2252 rhead = msg->front.iov_base;
2253
2254 flags = le32_to_cpu(rhead->flags);
2255 flags |= CEPH_MDS_FLAG_REPLAY;
2256 rhead->flags = cpu_to_le32(flags);
2257
2258 if (req->r_target_inode)
2259 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2260
2261 rhead->num_retry = req->r_attempts - 1;
2262
2263 /* remove cap/dentry releases from message */
2264 rhead->num_releases = 0;
2265
2266 /* time stamp */
2267 p = msg->front.iov_base + req->r_request_release_offset;
2268 {
2269 struct ceph_timespec ts;
2270 ceph_encode_timespec64(&ts, &req->r_stamp);
2271 ceph_encode_copy(&p, &ts, sizeof(ts));
2272 }
2273
2274 msg->front.iov_len = p - msg->front.iov_base;
2275 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2276 return 0;
2277 }
2278
2279 if (req->r_request) {
2280 ceph_msg_put(req->r_request);
2281 req->r_request = NULL;
2282 }
2283 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2284 if (IS_ERR(msg)) {
2285 req->r_err = PTR_ERR(msg);
2286 return PTR_ERR(msg);
2287 }
2288 req->r_request = msg;
2289
2290 rhead = msg->front.iov_base;
2291 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2292 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2293 flags |= CEPH_MDS_FLAG_REPLAY;
2294 if (req->r_parent)
2295 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2296 rhead->flags = cpu_to_le32(flags);
2297 rhead->num_fwd = req->r_num_fwd;
2298 rhead->num_retry = req->r_attempts - 1;
2299 rhead->ino = 0;
2300
2301 dout(" r_parent = %p\n", req->r_parent);
2302 return 0;
2303 }
2304
2305 /*
2306 * send request, or put it on the appropriate wait list.
2307 */
2308 static void __do_request(struct ceph_mds_client *mdsc,
2309 struct ceph_mds_request *req)
2310 {
2311 struct ceph_mds_session *session = NULL;
2312 int mds = -1;
2313 int err = 0;
2314
2315 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2316 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
2317 __unregister_request(mdsc, req);
2318 return;
2319 }
2320
2321 if (req->r_timeout &&
2322 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2323 dout("do_request timed out\n");
2324 err = -EIO;
2325 goto finish;
2326 }
2327 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2328 dout("do_request forced umount\n");
2329 err = -EIO;
2330 goto finish;
2331 }
2332 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2333 if (mdsc->mdsmap_err) {
2334 err = mdsc->mdsmap_err;
2335 dout("do_request mdsmap err %d\n", err);
2336 goto finish;
2337 }
2338 if (mdsc->mdsmap->m_epoch == 0) {
2339 dout("do_request no mdsmap, waiting for map\n");
2340 list_add(&req->r_wait, &mdsc->waiting_for_map);
2341 return;
2342 }
2343 if (!(mdsc->fsc->mount_options->flags &
2344 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2345 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2346 err = -EHOSTUNREACH;
2347 goto finish;
2348 }
2349 }
2350
2351 put_request_session(req);
2352
2353 mds = __choose_mds(mdsc, req);
2354 if (mds < 0 ||
2355 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2356 dout("do_request no mds or not active, waiting for map\n");
2357 list_add(&req->r_wait, &mdsc->waiting_for_map);
2358 return;
2359 }
2360
2361 /* get, open session */
2362 session = __ceph_lookup_mds_session(mdsc, mds);
2363 if (!session) {
2364 session = register_session(mdsc, mds);
2365 if (IS_ERR(session)) {
2366 err = PTR_ERR(session);
2367 goto finish;
2368 }
2369 }
2370 req->r_session = get_session(session);
2371
2372 dout("do_request mds%d session %p state %s\n", mds, session,
2373 ceph_session_state_name(session->s_state));
2374 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2375 session->s_state != CEPH_MDS_SESSION_HUNG) {
2376 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2377 err = -EACCES;
2378 goto out_session;
2379 }
2380 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2381 session->s_state == CEPH_MDS_SESSION_CLOSING)
2382 __open_session(mdsc, session);
2383 list_add(&req->r_wait, &session->s_waiting);
2384 goto out_session;
2385 }
2386
2387 /* send request */
2388 req->r_resend_mds = -1; /* forget any previous mds hint */
2389
2390 if (req->r_request_started == 0) /* note request start time */
2391 req->r_request_started = jiffies;
2392
2393 err = __prepare_send_request(mdsc, req, mds, false);
2394 if (!err) {
2395 ceph_msg_get(req->r_request);
2396 ceph_con_send(&session->s_con, req->r_request);
2397 }
2398
2399 out_session:
2400 ceph_put_mds_session(session);
2401 finish:
2402 if (err) {
2403 dout("__do_request early error %d\n", err);
2404 req->r_err = err;
2405 complete_request(mdsc, req);
2406 __unregister_request(mdsc, req);
2407 }
2408 return;
2409 }
2410
2411 /*
2412 * called under mdsc->mutex
2413 */
2414 static void __wake_requests(struct ceph_mds_client *mdsc,
2415 struct list_head *head)
2416 {
2417 struct ceph_mds_request *req;
2418 LIST_HEAD(tmp_list);
2419
2420 list_splice_init(head, &tmp_list);
2421
2422 while (!list_empty(&tmp_list)) {
2423 req = list_entry(tmp_list.next,
2424 struct ceph_mds_request, r_wait);
2425 list_del_init(&req->r_wait);
2426 dout(" wake request %p tid %llu\n", req, req->r_tid);
2427 __do_request(mdsc, req);
2428 }
2429 }
2430
2431 /*
2432 * Wake up threads with requests pending for @mds, so that they can
2433 * resubmit their requests to a possibly different mds.
2434 */
2435 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2436 {
2437 struct ceph_mds_request *req;
2438 struct rb_node *p = rb_first(&mdsc->request_tree);
2439
2440 dout("kick_requests mds%d\n", mds);
2441 while (p) {
2442 req = rb_entry(p, struct ceph_mds_request, r_node);
2443 p = rb_next(p);
2444 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2445 continue;
2446 if (req->r_attempts > 0)
2447 continue; /* only new requests */
2448 if (req->r_session &&
2449 req->r_session->s_mds == mds) {
2450 dout(" kicking tid %llu\n", req->r_tid);
2451 list_del_init(&req->r_wait);
2452 __do_request(mdsc, req);
2453 }
2454 }
2455 }
2456
2457 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2458 struct ceph_mds_request *req)
2459 {
2460 dout("submit_request on %p\n", req);
2461 mutex_lock(&mdsc->mutex);
2462 __register_request(mdsc, req, NULL);
2463 __do_request(mdsc, req);
2464 mutex_unlock(&mdsc->mutex);
2465 }
2466
2467 /*
2468 * Synchrously perform an mds request. Take care of all of the
2469 * session setup, forwarding, retry details.
2470 */
2471 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2472 struct inode *dir,
2473 struct ceph_mds_request *req)
2474 {
2475 int err;
2476
2477 dout("do_request on %p\n", req);
2478
2479 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
2480 if (req->r_inode)
2481 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2482 if (req->r_parent)
2483 ceph_get_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
2484 if (req->r_old_dentry_dir)
2485 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2486 CEPH_CAP_PIN);
2487
2488 /* issue */
2489 mutex_lock(&mdsc->mutex);
2490 __register_request(mdsc, req, dir);
2491 __do_request(mdsc, req);
2492
2493 if (req->r_err) {
2494 err = req->r_err;
2495 goto out;
2496 }
2497
2498 /* wait */
2499 mutex_unlock(&mdsc->mutex);
2500 dout("do_request waiting\n");
2501 if (!req->r_timeout && req->r_wait_for_completion) {
2502 err = req->r_wait_for_completion(mdsc, req);
2503 } else {
2504 long timeleft = wait_for_completion_killable_timeout(
2505 &req->r_completion,
2506 ceph_timeout_jiffies(req->r_timeout));
2507 if (timeleft > 0)
2508 err = 0;
2509 else if (!timeleft)
2510 err = -EIO; /* timed out */
2511 else
2512 err = timeleft; /* killed */
2513 }
2514 dout("do_request waited, got %d\n", err);
2515 mutex_lock(&mdsc->mutex);
2516
2517 /* only abort if we didn't race with a real reply */
2518 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2519 err = le32_to_cpu(req->r_reply_info.head->result);
2520 } else if (err < 0) {
2521 dout("aborted request %lld with %d\n", req->r_tid, err);
2522
2523 /*
2524 * ensure we aren't running concurrently with
2525 * ceph_fill_trace or ceph_readdir_prepopulate, which
2526 * rely on locks (dir mutex) held by our caller.
2527 */
2528 mutex_lock(&req->r_fill_mutex);
2529 req->r_err = err;
2530 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
2531 mutex_unlock(&req->r_fill_mutex);
2532
2533 if (req->r_parent &&
2534 (req->r_op & CEPH_MDS_OP_WRITE))
2535 ceph_invalidate_dir_request(req);
2536 } else {
2537 err = req->r_err;
2538 }
2539
2540 out:
2541 mutex_unlock(&mdsc->mutex);
2542 dout("do_request %p done, result %d\n", req, err);
2543 return err;
2544 }
2545
2546 /*
2547 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2548 * namespace request.
2549 */
2550 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2551 {
2552 struct inode *dir = req->r_parent;
2553 struct inode *old_dir = req->r_old_dentry_dir;
2554
2555 dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
2556
2557 ceph_dir_clear_complete(dir);
2558 if (old_dir)
2559 ceph_dir_clear_complete(old_dir);
2560 if (req->r_dentry)
2561 ceph_invalidate_dentry_lease(req->r_dentry);
2562 if (req->r_old_dentry)
2563 ceph_invalidate_dentry_lease(req->r_old_dentry);
2564 }
2565
2566 /*
2567 * Handle mds reply.
2568 *
2569 * We take the session mutex and parse and process the reply immediately.
2570 * This preserves the logical ordering of replies, capabilities, etc., sent
2571 * by the MDS as they are applied to our local cache.
2572 */
2573 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2574 {
2575 struct ceph_mds_client *mdsc = session->s_mdsc;
2576 struct ceph_mds_request *req;
2577 struct ceph_mds_reply_head *head = msg->front.iov_base;
2578 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2579 struct ceph_snap_realm *realm;
2580 u64 tid;
2581 int err, result;
2582 int mds = session->s_mds;
2583
2584 if (msg->front.iov_len < sizeof(*head)) {
2585 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2586 ceph_msg_dump(msg);
2587 return;
2588 }
2589
2590 /* get request, session */
2591 tid = le64_to_cpu(msg->hdr.tid);
2592 mutex_lock(&mdsc->mutex);
2593 req = lookup_get_request(mdsc, tid);
2594 if (!req) {
2595 dout("handle_reply on unknown tid %llu\n", tid);
2596 mutex_unlock(&mdsc->mutex);
2597 return;
2598 }
2599 dout("handle_reply %p\n", req);
2600
2601 /* correct session? */
2602 if (req->r_session != session) {
2603 pr_err("mdsc_handle_reply got %llu on session mds%d"
2604 " not mds%d\n", tid, session->s_mds,
2605 req->r_session ? req->r_session->s_mds : -1);
2606 mutex_unlock(&mdsc->mutex);
2607 goto out;
2608 }
2609
2610 /* dup? */
2611 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
2612 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
2613 pr_warn("got a dup %s reply on %llu from mds%d\n",
2614 head->safe ? "safe" : "unsafe", tid, mds);
2615 mutex_unlock(&mdsc->mutex);
2616 goto out;
2617 }
2618 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
2619 pr_warn("got unsafe after safe on %llu from mds%d\n",
2620 tid, mds);
2621 mutex_unlock(&mdsc->mutex);
2622 goto out;
2623 }
2624
2625 result = le32_to_cpu(head->result);
2626
2627 /*
2628 * Handle an ESTALE
2629 * if we're not talking to the authority, send to them
2630 * if the authority has changed while we weren't looking,
2631 * send to new authority
2632 * Otherwise we just have to return an ESTALE
2633 */
2634 if (result == -ESTALE) {
2635 dout("got ESTALE on request %llu\n", req->r_tid);
2636 req->r_resend_mds = -1;
2637 if (req->r_direct_mode != USE_AUTH_MDS) {
2638 dout("not using auth, setting for that now\n");
2639 req->r_direct_mode = USE_AUTH_MDS;
2640 __do_request(mdsc, req);
2641 mutex_unlock(&mdsc->mutex);
2642 goto out;
2643 } else {
2644 int mds = __choose_mds(mdsc, req);
2645 if (mds >= 0 && mds != req->r_session->s_mds) {
2646 dout("but auth changed, so resending\n");
2647 __do_request(mdsc, req);
2648 mutex_unlock(&mdsc->mutex);
2649 goto out;
2650 }
2651 }
2652 dout("have to return ESTALE on request %llu\n", req->r_tid);
2653 }
2654
2655
2656 if (head->safe) {
2657 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2658 __unregister_request(mdsc, req);
2659
2660 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2661 /*
2662 * We already handled the unsafe response, now do the
2663 * cleanup. No need to examine the response; the MDS
2664 * doesn't include any result info in the safe
2665 * response. And even if it did, there is nothing
2666 * useful we could do with a revised return value.
2667 */
2668 dout("got safe reply %llu, mds%d\n", tid, mds);
2669
2670 /* last unsafe request during umount? */
2671 if (mdsc->stopping && !__get_oldest_req(mdsc))
2672 complete_all(&mdsc->safe_umount_waiters);
2673 mutex_unlock(&mdsc->mutex);
2674 goto out;
2675 }
2676 } else {
2677 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2678 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2679 if (req->r_unsafe_dir) {
2680 struct ceph_inode_info *ci =
2681 ceph_inode(req->r_unsafe_dir);
2682 spin_lock(&ci->i_unsafe_lock);
2683 list_add_tail(&req->r_unsafe_dir_item,
2684 &ci->i_unsafe_dirops);
2685 spin_unlock(&ci->i_unsafe_lock);
2686 }
2687 }
2688
2689 dout("handle_reply tid %lld result %d\n", tid, result);
2690 rinfo = &req->r_reply_info;
2691 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2692 mutex_unlock(&mdsc->mutex);
2693
2694 mutex_lock(&session->s_mutex);
2695 if (err < 0) {
2696 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2697 ceph_msg_dump(msg);
2698 goto out_err;
2699 }
2700
2701 /* snap trace */
2702 realm = NULL;
2703 if (rinfo->snapblob_len) {
2704 down_write(&mdsc->snap_rwsem);
2705 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2706 rinfo->snapblob + rinfo->snapblob_len,
2707 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2708 &realm);
2709 downgrade_write(&mdsc->snap_rwsem);
2710 } else {
2711 down_read(&mdsc->snap_rwsem);
2712 }
2713
2714 /* insert trace into our cache */
2715 mutex_lock(&req->r_fill_mutex);
2716 current->journal_info = req;
2717 err = ceph_fill_trace(mdsc->fsc->sb, req);
2718 if (err == 0) {
2719 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2720 req->r_op == CEPH_MDS_OP_LSSNAP))
2721 ceph_readdir_prepopulate(req, req->r_session);
2722 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2723 }
2724 current->journal_info = NULL;
2725 mutex_unlock(&req->r_fill_mutex);
2726
2727 up_read(&mdsc->snap_rwsem);
2728 if (realm)
2729 ceph_put_snap_realm(mdsc, realm);
2730
2731 if (err == 0 && req->r_target_inode &&
2732 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2733 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2734 spin_lock(&ci->i_unsafe_lock);
2735 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2736 spin_unlock(&ci->i_unsafe_lock);
2737 }
2738 out_err:
2739 mutex_lock(&mdsc->mutex);
2740 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2741 if (err) {
2742 req->r_err = err;
2743 } else {
2744 req->r_reply = ceph_msg_get(msg);
2745 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
2746 }
2747 } else {
2748 dout("reply arrived after request %lld was aborted\n", tid);
2749 }
2750 mutex_unlock(&mdsc->mutex);
2751
2752 mutex_unlock(&session->s_mutex);
2753
2754 /* kick calling process */
2755 complete_request(mdsc, req);
2756 out:
2757 ceph_mdsc_put_request(req);
2758 return;
2759 }
2760
2761
2762
2763 /*
2764 * handle mds notification that our request has been forwarded.
2765 */
2766 static void handle_forward(struct ceph_mds_client *mdsc,
2767 struct ceph_mds_session *session,
2768 struct ceph_msg *msg)
2769 {
2770 struct ceph_mds_request *req;
2771 u64 tid = le64_to_cpu(msg->hdr.tid);
2772 u32 next_mds;
2773 u32 fwd_seq;
2774 int err = -EINVAL;
2775 void *p = msg->front.iov_base;
2776 void *end = p + msg->front.iov_len;
2777
2778 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2779 next_mds = ceph_decode_32(&p);
2780 fwd_seq = ceph_decode_32(&p);
2781
2782 mutex_lock(&mdsc->mutex);
2783 req = lookup_get_request(mdsc, tid);
2784 if (!req) {
2785 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2786 goto out; /* dup reply? */
2787 }
2788
2789 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2790 dout("forward tid %llu aborted, unregistering\n", tid);
2791 __unregister_request(mdsc, req);
2792 } else if (fwd_seq <= req->r_num_fwd) {
2793 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2794 tid, next_mds, req->r_num_fwd, fwd_seq);
2795 } else {
2796 /* resend. forward race not possible; mds would drop */
2797 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2798 BUG_ON(req->r_err);
2799 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
2800 req->r_attempts = 0;
2801 req->r_num_fwd = fwd_seq;
2802 req->r_resend_mds = next_mds;
2803 put_request_session(req);
2804 __do_request(mdsc, req);
2805 }
2806 ceph_mdsc_put_request(req);
2807 out:
2808 mutex_unlock(&mdsc->mutex);
2809 return;
2810
2811 bad:
2812 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2813 }
2814
2815 /*
2816 * handle a mds session control message
2817 */
2818 static void handle_session(struct ceph_mds_session *session,
2819 struct ceph_msg *msg)
2820 {
2821 struct ceph_mds_client *mdsc = session->s_mdsc;
2822 u32 op;
2823 u64 seq;
2824 int mds = session->s_mds;
2825 struct ceph_mds_session_head *h = msg->front.iov_base;
2826 int wake = 0;
2827
2828 /* decode */
2829 if (msg->front.iov_len < sizeof(*h))
2830 goto bad;
2831 op = le32_to_cpu(h->op);
2832 seq = le64_to_cpu(h->seq);
2833
2834 mutex_lock(&mdsc->mutex);
2835 if (op == CEPH_SESSION_CLOSE) {
2836 get_session(session);
2837 __unregister_session(mdsc, session);
2838 }
2839 /* FIXME: this ttl calculation is generous */
2840 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2841 mutex_unlock(&mdsc->mutex);
2842
2843 mutex_lock(&session->s_mutex);
2844
2845 dout("handle_session mds%d %s %p state %s seq %llu\n",
2846 mds, ceph_session_op_name(op), session,
2847 ceph_session_state_name(session->s_state), seq);
2848
2849 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2850 session->s_state = CEPH_MDS_SESSION_OPEN;
2851 pr_info("mds%d came back\n", session->s_mds);
2852 }
2853
2854 switch (op) {
2855 case CEPH_SESSION_OPEN:
2856 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2857 pr_info("mds%d reconnect success\n", session->s_mds);
2858 session->s_state = CEPH_MDS_SESSION_OPEN;
2859 renewed_caps(mdsc, session, 0);
2860 wake = 1;
2861 if (mdsc->stopping)
2862 __close_session(mdsc, session);
2863 break;
2864
2865 case CEPH_SESSION_RENEWCAPS:
2866 if (session->s_renew_seq == seq)
2867 renewed_caps(mdsc, session, 1);
2868 break;
2869
2870 case CEPH_SESSION_CLOSE:
2871 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2872 pr_info("mds%d reconnect denied\n", session->s_mds);
2873 cleanup_session_requests(mdsc, session);
2874 remove_session_caps(session);
2875 wake = 2; /* for good measure */
2876 wake_up_all(&mdsc->session_close_wq);
2877 break;
2878
2879 case CEPH_SESSION_STALE:
2880 pr_info("mds%d caps went stale, renewing\n",
2881 session->s_mds);
2882 spin_lock(&session->s_gen_ttl_lock);
2883 session->s_cap_gen++;
2884 session->s_cap_ttl = jiffies - 1;
2885 spin_unlock(&session->s_gen_ttl_lock);
2886 send_renew_caps(mdsc, session);
2887 break;
2888
2889 case CEPH_SESSION_RECALL_STATE:
2890 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2891 break;
2892
2893 case CEPH_SESSION_FLUSHMSG:
2894 send_flushmsg_ack(mdsc, session, seq);
2895 break;
2896
2897 case CEPH_SESSION_FORCE_RO:
2898 dout("force_session_readonly %p\n", session);
2899 spin_lock(&session->s_cap_lock);
2900 session->s_readonly = true;
2901 spin_unlock(&session->s_cap_lock);
2902 wake_up_session_caps(session, 0);
2903 break;
2904
2905 case CEPH_SESSION_REJECT:
2906 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
2907 pr_info("mds%d rejected session\n", session->s_mds);
2908 session->s_state = CEPH_MDS_SESSION_REJECTED;
2909 cleanup_session_requests(mdsc, session);
2910 remove_session_caps(session);
2911 wake = 2; /* for good measure */
2912 break;
2913
2914 default:
2915 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2916 WARN_ON(1);
2917 }
2918
2919 mutex_unlock(&session->s_mutex);
2920 if (wake) {
2921 mutex_lock(&mdsc->mutex);
2922 __wake_requests(mdsc, &session->s_waiting);
2923 if (wake == 2)
2924 kick_requests(mdsc, mds);
2925 mutex_unlock(&mdsc->mutex);
2926 }
2927 if (op == CEPH_SESSION_CLOSE)
2928 ceph_put_mds_session(session);
2929 return;
2930
2931 bad:
2932 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2933 (int)msg->front.iov_len);
2934 ceph_msg_dump(msg);
2935 return;
2936 }
2937
2938
2939 /*
2940 * called under session->mutex.
2941 */
2942 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2943 struct ceph_mds_session *session)
2944 {
2945 struct ceph_mds_request *req, *nreq;
2946 struct rb_node *p;
2947 int err;
2948
2949 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2950
2951 mutex_lock(&mdsc->mutex);
2952 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2953 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2954 if (!err) {
2955 ceph_msg_get(req->r_request);
2956 ceph_con_send(&session->s_con, req->r_request);
2957 }
2958 }
2959
2960 /*
2961 * also re-send old requests when MDS enters reconnect stage. So that MDS
2962 * can process completed request in clientreplay stage.
2963 */
2964 p = rb_first(&mdsc->request_tree);
2965 while (p) {
2966 req = rb_entry(p, struct ceph_mds_request, r_node);
2967 p = rb_next(p);
2968 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2969 continue;
2970 if (req->r_attempts == 0)
2971 continue; /* only old requests */
2972 if (req->r_session &&
2973 req->r_session->s_mds == session->s_mds) {
2974 err = __prepare_send_request(mdsc, req,
2975 session->s_mds, true);
2976 if (!err) {
2977 ceph_msg_get(req->r_request);
2978 ceph_con_send(&session->s_con, req->r_request);
2979 }
2980 }
2981 }
2982 mutex_unlock(&mdsc->mutex);
2983 }
2984
2985 /*
2986 * Encode information about a cap for a reconnect with the MDS.
2987 */
2988 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2989 void *arg)
2990 {
2991 union {
2992 struct ceph_mds_cap_reconnect v2;
2993 struct ceph_mds_cap_reconnect_v1 v1;
2994 } rec;
2995 struct ceph_inode_info *ci = cap->ci;
2996 struct ceph_reconnect_state *recon_state = arg;
2997 struct ceph_pagelist *pagelist = recon_state->pagelist;
2998 char *path;
2999 int pathlen, err;
3000 u64 pathbase;
3001 u64 snap_follows;
3002 struct dentry *dentry;
3003
3004 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
3005 inode, ceph_vinop(inode), cap, cap->cap_id,
3006 ceph_cap_string(cap->issued));
3007 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
3008 if (err)
3009 return err;
3010
3011 dentry = d_find_alias(inode);
3012 if (dentry) {
3013 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
3014 if (IS_ERR(path)) {
3015 err = PTR_ERR(path);
3016 goto out_dput;
3017 }
3018 } else {
3019 path = NULL;
3020 pathlen = 0;
3021 pathbase = 0;
3022 }
3023
3024 spin_lock(&ci->i_ceph_lock);
3025 cap->seq = 0; /* reset cap seq */
3026 cap->issue_seq = 0; /* and issue_seq */
3027 cap->mseq = 0; /* and migrate_seq */
3028 cap->cap_gen = cap->session->s_cap_gen;
3029
3030 if (recon_state->msg_version >= 2) {
3031 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
3032 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3033 rec.v2.issued = cpu_to_le32(cap->issued);
3034 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3035 rec.v2.pathbase = cpu_to_le64(pathbase);
3036 rec.v2.flock_len = (__force __le32)
3037 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
3038 } else {
3039 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
3040 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3041 rec.v1.issued = cpu_to_le32(cap->issued);
3042 rec.v1.size = cpu_to_le64(inode->i_size);
3043 ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
3044 ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
3045 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3046 rec.v1.pathbase = cpu_to_le64(pathbase);
3047 }
3048
3049 if (list_empty(&ci->i_cap_snaps)) {
3050 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3051 } else {
3052 struct ceph_cap_snap *capsnap =
3053 list_first_entry(&ci->i_cap_snaps,
3054 struct ceph_cap_snap, ci_item);
3055 snap_follows = capsnap->follows;
3056 }
3057 spin_unlock(&ci->i_ceph_lock);
3058
3059 if (recon_state->msg_version >= 2) {
3060 int num_fcntl_locks, num_flock_locks;
3061 struct ceph_filelock *flocks = NULL;
3062 size_t struct_len, total_len = 0;
3063 u8 struct_v = 0;
3064
3065 encode_again:
3066 if (rec.v2.flock_len) {
3067 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
3068 } else {
3069 num_fcntl_locks = 0;
3070 num_flock_locks = 0;
3071 }
3072 if (num_fcntl_locks + num_flock_locks > 0) {
3073 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
3074 sizeof(struct ceph_filelock),
3075 GFP_NOFS);
3076 if (!flocks) {
3077 err = -ENOMEM;
3078 goto out_free;
3079 }
3080 err = ceph_encode_locks_to_buffer(inode, flocks,
3081 num_fcntl_locks,
3082 num_flock_locks);
3083 if (err) {
3084 kfree(flocks);
3085 flocks = NULL;
3086 if (err == -ENOSPC)
3087 goto encode_again;
3088 goto out_free;
3089 }
3090 } else {
3091 kfree(flocks);
3092 flocks = NULL;
3093 }
3094
3095 if (recon_state->msg_version >= 3) {
3096 /* version, compat_version and struct_len */
3097 total_len = 2 * sizeof(u8) + sizeof(u32);
3098 struct_v = 2;
3099 }
3100 /*
3101 * number of encoded locks is stable, so copy to pagelist
3102 */
3103 struct_len = 2 * sizeof(u32) +
3104 (num_fcntl_locks + num_flock_locks) *
3105 sizeof(struct ceph_filelock);
3106 rec.v2.flock_len = cpu_to_le32(struct_len);
3107
3108 struct_len += sizeof(rec.v2);
3109 struct_len += sizeof(u32) + pathlen;
3110
3111 if (struct_v >= 2)
3112 struct_len += sizeof(u64); /* snap_follows */
3113
3114 total_len += struct_len;
3115 err = ceph_pagelist_reserve(pagelist, total_len);
3116
3117 if (!err) {
3118 if (recon_state->msg_version >= 3) {
3119 ceph_pagelist_encode_8(pagelist, struct_v);
3120 ceph_pagelist_encode_8(pagelist, 1);
3121 ceph_pagelist_encode_32(pagelist, struct_len);
3122 }
3123 ceph_pagelist_encode_string(pagelist, path, pathlen);
3124 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
3125 ceph_locks_to_pagelist(flocks, pagelist,
3126 num_fcntl_locks,
3127 num_flock_locks);
3128 if (struct_v >= 2)
3129 ceph_pagelist_encode_64(pagelist, snap_follows);
3130 }
3131 kfree(flocks);
3132 } else {
3133 size_t size = sizeof(u32) + pathlen + sizeof(rec.v1);
3134 err = ceph_pagelist_reserve(pagelist, size);
3135 if (!err) {
3136 ceph_pagelist_encode_string(pagelist, path, pathlen);
3137 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
3138 }
3139 }
3140
3141 recon_state->nr_caps++;
3142 out_free:
3143 kfree(path);
3144 out_dput:
3145 dput(dentry);
3146 return err;
3147 }
3148
3149
3150 /*
3151 * If an MDS fails and recovers, clients need to reconnect in order to
3152 * reestablish shared state. This includes all caps issued through
3153 * this session _and_ the snap_realm hierarchy. Because it's not
3154 * clear which snap realms the mds cares about, we send everything we
3155 * know about.. that ensures we'll then get any new info the
3156 * recovering MDS might have.
3157 *
3158 * This is a relatively heavyweight operation, but it's rare.
3159 *
3160 * called with mdsc->mutex held.
3161 */
3162 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
3163 struct ceph_mds_session *session)
3164 {
3165 struct ceph_msg *reply;
3166 struct rb_node *p;
3167 int mds = session->s_mds;
3168 int err = -ENOMEM;
3169 int s_nr_caps;
3170 struct ceph_pagelist *pagelist;
3171 struct ceph_reconnect_state recon_state;
3172 LIST_HEAD(dispose);
3173
3174 pr_info("mds%d reconnect start\n", mds);
3175
3176 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
3177 if (!pagelist)
3178 goto fail_nopagelist;
3179 ceph_pagelist_init(pagelist);
3180
3181 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
3182 if (!reply)
3183 goto fail_nomsg;
3184
3185 mutex_lock(&session->s_mutex);
3186 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
3187 session->s_seq = 0;
3188
3189 dout("session %p state %s\n", session,
3190 ceph_session_state_name(session->s_state));
3191
3192 spin_lock(&session->s_gen_ttl_lock);
3193 session->s_cap_gen++;
3194 spin_unlock(&session->s_gen_ttl_lock);
3195
3196 spin_lock(&session->s_cap_lock);
3197 /* don't know if session is readonly */
3198 session->s_readonly = 0;
3199 /*
3200 * notify __ceph_remove_cap() that we are composing cap reconnect.
3201 * If a cap get released before being added to the cap reconnect,
3202 * __ceph_remove_cap() should skip queuing cap release.
3203 */
3204 session->s_cap_reconnect = 1;
3205 /* drop old cap expires; we're about to reestablish that state */
3206 detach_cap_releases(session, &dispose);
3207 spin_unlock(&session->s_cap_lock);
3208 dispose_cap_releases(mdsc, &dispose);
3209
3210 /* trim unused caps to reduce MDS's cache rejoin time */
3211 if (mdsc->fsc->sb->s_root)
3212 shrink_dcache_parent(mdsc->fsc->sb->s_root);
3213
3214 ceph_con_close(&session->s_con);
3215 ceph_con_open(&session->s_con,
3216 CEPH_ENTITY_TYPE_MDS, mds,
3217 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
3218
3219 /* replay unsafe requests */
3220 replay_unsafe_requests(mdsc, session);
3221
3222 down_read(&mdsc->snap_rwsem);
3223
3224 /* traverse this session's caps */
3225 s_nr_caps = session->s_nr_caps;
3226 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
3227 if (err)
3228 goto fail;
3229
3230 recon_state.nr_caps = 0;
3231 recon_state.pagelist = pagelist;
3232 if (session->s_con.peer_features & CEPH_FEATURE_MDSENC)
3233 recon_state.msg_version = 3;
3234 else if (session->s_con.peer_features & CEPH_FEATURE_FLOCK)
3235 recon_state.msg_version = 2;
3236 else
3237 recon_state.msg_version = 1;
3238 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
3239 if (err < 0)
3240 goto fail;
3241
3242 spin_lock(&session->s_cap_lock);
3243 session->s_cap_reconnect = 0;
3244 spin_unlock(&session->s_cap_lock);
3245
3246 /*
3247 * snaprealms. we provide mds with the ino, seq (version), and
3248 * parent for all of our realms. If the mds has any newer info,
3249 * it will tell us.
3250 */
3251 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3252 struct ceph_snap_realm *realm =
3253 rb_entry(p, struct ceph_snap_realm, node);
3254 struct ceph_mds_snaprealm_reconnect sr_rec;
3255
3256 dout(" adding snap realm %llx seq %lld parent %llx\n",
3257 realm->ino, realm->seq, realm->parent_ino);
3258 sr_rec.ino = cpu_to_le64(realm->ino);
3259 sr_rec.seq = cpu_to_le64(realm->seq);
3260 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3261 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3262 if (err)
3263 goto fail;
3264 }
3265
3266 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
3267
3268 /* raced with cap release? */
3269 if (s_nr_caps != recon_state.nr_caps) {
3270 struct page *page = list_first_entry(&pagelist->head,
3271 struct page, lru);
3272 __le32 *addr = kmap_atomic(page);
3273 *addr = cpu_to_le32(recon_state.nr_caps);
3274 kunmap_atomic(addr);
3275 }
3276
3277 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3278 ceph_msg_data_add_pagelist(reply, pagelist);
3279
3280 ceph_early_kick_flushing_caps(mdsc, session);
3281
3282 ceph_con_send(&session->s_con, reply);
3283
3284 mutex_unlock(&session->s_mutex);
3285
3286 mutex_lock(&mdsc->mutex);
3287 __wake_requests(mdsc, &session->s_waiting);
3288 mutex_unlock(&mdsc->mutex);
3289
3290 up_read(&mdsc->snap_rwsem);
3291 return;
3292
3293 fail:
3294 ceph_msg_put(reply);
3295 up_read(&mdsc->snap_rwsem);
3296 mutex_unlock(&session->s_mutex);
3297 fail_nomsg:
3298 ceph_pagelist_release(pagelist);
3299 fail_nopagelist:
3300 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
3301 return;
3302 }
3303
3304
3305 /*
3306 * compare old and new mdsmaps, kicking requests
3307 * and closing out old connections as necessary
3308 *
3309 * called under mdsc->mutex.
3310 */
3311 static void check_new_map(struct ceph_mds_client *mdsc,
3312 struct ceph_mdsmap *newmap,
3313 struct ceph_mdsmap *oldmap)
3314 {
3315 int i;
3316 int oldstate, newstate;
3317 struct ceph_mds_session *s;
3318
3319 dout("check_new_map new %u old %u\n",
3320 newmap->m_epoch, oldmap->m_epoch);
3321
3322 for (i = 0; i < oldmap->m_num_mds && i < mdsc->max_sessions; i++) {
3323 if (!mdsc->sessions[i])
3324 continue;
3325 s = mdsc->sessions[i];
3326 oldstate = ceph_mdsmap_get_state(oldmap, i);
3327 newstate = ceph_mdsmap_get_state(newmap, i);
3328
3329 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3330 i, ceph_mds_state_name(oldstate),
3331 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
3332 ceph_mds_state_name(newstate),
3333 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
3334 ceph_session_state_name(s->s_state));
3335
3336 if (i >= newmap->m_num_mds ||
3337 memcmp(ceph_mdsmap_get_addr(oldmap, i),
3338 ceph_mdsmap_get_addr(newmap, i),
3339 sizeof(struct ceph_entity_addr))) {
3340 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3341 /* the session never opened, just close it
3342 * out now */
3343 get_session(s);
3344 __unregister_session(mdsc, s);
3345 __wake_requests(mdsc, &s->s_waiting);
3346 ceph_put_mds_session(s);
3347 } else if (i >= newmap->m_num_mds) {
3348 /* force close session for stopped mds */
3349 get_session(s);
3350 __unregister_session(mdsc, s);
3351 __wake_requests(mdsc, &s->s_waiting);
3352 kick_requests(mdsc, i);
3353 mutex_unlock(&mdsc->mutex);
3354
3355 mutex_lock(&s->s_mutex);
3356 cleanup_session_requests(mdsc, s);
3357 remove_session_caps(s);
3358 mutex_unlock(&s->s_mutex);
3359
3360 ceph_put_mds_session(s);
3361
3362 mutex_lock(&mdsc->mutex);
3363 } else {
3364 /* just close it */
3365 mutex_unlock(&mdsc->mutex);
3366 mutex_lock(&s->s_mutex);
3367 mutex_lock(&mdsc->mutex);
3368 ceph_con_close(&s->s_con);
3369 mutex_unlock(&s->s_mutex);
3370 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3371 }
3372 } else if (oldstate == newstate) {
3373 continue; /* nothing new with this mds */
3374 }
3375
3376 /*
3377 * send reconnect?
3378 */
3379 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
3380 newstate >= CEPH_MDS_STATE_RECONNECT) {
3381 mutex_unlock(&mdsc->mutex);
3382 send_mds_reconnect(mdsc, s);
3383 mutex_lock(&mdsc->mutex);
3384 }
3385
3386 /*
3387 * kick request on any mds that has gone active.
3388 */
3389 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3390 newstate >= CEPH_MDS_STATE_ACTIVE) {
3391 if (oldstate != CEPH_MDS_STATE_CREATING &&
3392 oldstate != CEPH_MDS_STATE_STARTING)
3393 pr_info("mds%d recovery completed\n", s->s_mds);
3394 kick_requests(mdsc, i);
3395 ceph_kick_flushing_caps(mdsc, s);
3396 wake_up_session_caps(s, 1);
3397 }
3398 }
3399
3400 for (i = 0; i < newmap->m_num_mds && i < mdsc->max_sessions; i++) {
3401 s = mdsc->sessions[i];
3402 if (!s)
3403 continue;
3404 if (!ceph_mdsmap_is_laggy(newmap, i))
3405 continue;
3406 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3407 s->s_state == CEPH_MDS_SESSION_HUNG ||
3408 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3409 dout(" connecting to export targets of laggy mds%d\n",
3410 i);
3411 __open_export_target_sessions(mdsc, s);
3412 }
3413 }
3414 }
3415
3416
3417
3418 /*
3419 * leases
3420 */
3421
3422 /*
3423 * caller must hold session s_mutex, dentry->d_lock
3424 */
3425 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3426 {
3427 struct ceph_dentry_info *di = ceph_dentry(dentry);
3428
3429 ceph_put_mds_session(di->lease_session);
3430 di->lease_session = NULL;
3431 }
3432
3433 static void handle_lease(struct ceph_mds_client *mdsc,
3434 struct ceph_mds_session *session,
3435 struct ceph_msg *msg)
3436 {
3437 struct super_block *sb = mdsc->fsc->sb;
3438 struct inode *inode;
3439 struct dentry *parent, *dentry;
3440 struct ceph_dentry_info *di;
3441 int mds = session->s_mds;
3442 struct ceph_mds_lease *h = msg->front.iov_base;
3443 u32 seq;
3444 struct ceph_vino vino;
3445 struct qstr dname;
3446 int release = 0;
3447
3448 dout("handle_lease from mds%d\n", mds);
3449
3450 /* decode */
3451 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3452 goto bad;
3453 vino.ino = le64_to_cpu(h->ino);
3454 vino.snap = CEPH_NOSNAP;
3455 seq = le32_to_cpu(h->seq);
3456 dname.len = get_unaligned_le32(h + 1);
3457 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
3458 goto bad;
3459 dname.name = (void *)(h + 1) + sizeof(u32);
3460
3461 /* lookup inode */
3462 inode = ceph_find_inode(sb, vino);
3463 dout("handle_lease %s, ino %llx %p %.*s\n",
3464 ceph_lease_op_name(h->action), vino.ino, inode,
3465 dname.len, dname.name);
3466
3467 mutex_lock(&session->s_mutex);
3468 session->s_seq++;
3469
3470 if (!inode) {
3471 dout("handle_lease no inode %llx\n", vino.ino);
3472 goto release;
3473 }
3474
3475 /* dentry */
3476 parent = d_find_alias(inode);
3477 if (!parent) {
3478 dout("no parent dentry on inode %p\n", inode);
3479 WARN_ON(1);
3480 goto release; /* hrm... */
3481 }
3482 dname.hash = full_name_hash(parent, dname.name, dname.len);
3483 dentry = d_lookup(parent, &dname);
3484 dput(parent);
3485 if (!dentry)
3486 goto release;
3487
3488 spin_lock(&dentry->d_lock);
3489 di = ceph_dentry(dentry);
3490 switch (h->action) {
3491 case CEPH_MDS_LEASE_REVOKE:
3492 if (di->lease_session == session) {
3493 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3494 h->seq = cpu_to_le32(di->lease_seq);
3495 __ceph_mdsc_drop_dentry_lease(dentry);
3496 }
3497 release = 1;
3498 break;
3499
3500 case CEPH_MDS_LEASE_RENEW:
3501 if (di->lease_session == session &&
3502 di->lease_gen == session->s_cap_gen &&
3503 di->lease_renew_from &&
3504 di->lease_renew_after == 0) {
3505 unsigned long duration =
3506 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
3507
3508 di->lease_seq = seq;
3509 di->time = di->lease_renew_from + duration;
3510 di->lease_renew_after = di->lease_renew_from +
3511 (duration >> 1);
3512 di->lease_renew_from = 0;
3513 }
3514 break;
3515 }
3516 spin_unlock(&dentry->d_lock);
3517 dput(dentry);
3518
3519 if (!release)
3520 goto out;
3521
3522 release:
3523 /* let's just reuse the same message */
3524 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3525 ceph_msg_get(msg);
3526 ceph_con_send(&session->s_con, msg);
3527
3528 out:
3529 iput(inode);
3530 mutex_unlock(&session->s_mutex);
3531 return;
3532
3533 bad:
3534 pr_err("corrupt lease message\n");
3535 ceph_msg_dump(msg);
3536 }
3537
3538 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3539 struct inode *inode,
3540 struct dentry *dentry, char action,
3541 u32 seq)
3542 {
3543 struct ceph_msg *msg;
3544 struct ceph_mds_lease *lease;
3545 int len = sizeof(*lease) + sizeof(u32);
3546 int dnamelen = 0;
3547
3548 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3549 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3550 dnamelen = dentry->d_name.len;
3551 len += dnamelen;
3552
3553 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
3554 if (!msg)
3555 return;
3556 lease = msg->front.iov_base;
3557 lease->action = action;
3558 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3559 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3560 lease->seq = cpu_to_le32(seq);
3561 put_unaligned_le32(dnamelen, lease + 1);
3562 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3563
3564 /*
3565 * if this is a preemptive lease RELEASE, no need to
3566 * flush request stream, since the actual request will
3567 * soon follow.
3568 */
3569 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3570
3571 ceph_con_send(&session->s_con, msg);
3572 }
3573
3574 /*
3575 * lock unlock sessions, to wait ongoing session activities
3576 */
3577 static void lock_unlock_sessions(struct ceph_mds_client *mdsc)
3578 {
3579 int i;
3580
3581 mutex_lock(&mdsc->mutex);
3582 for (i = 0; i < mdsc->max_sessions; i++) {
3583 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3584 if (!s)
3585 continue;
3586 mutex_unlock(&mdsc->mutex);
3587 mutex_lock(&s->s_mutex);
3588 mutex_unlock(&s->s_mutex);
3589 ceph_put_mds_session(s);
3590 mutex_lock(&mdsc->mutex);
3591 }
3592 mutex_unlock(&mdsc->mutex);
3593 }
3594
3595
3596
3597 /*
3598 * delayed work -- periodically trim expired leases, renew caps with mds
3599 */
3600 static void schedule_delayed(struct ceph_mds_client *mdsc)
3601 {
3602 int delay = 5;
3603 unsigned hz = round_jiffies_relative(HZ * delay);
3604 schedule_delayed_work(&mdsc->delayed_work, hz);
3605 }
3606
3607 static void delayed_work(struct work_struct *work)
3608 {
3609 int i;
3610 struct ceph_mds_client *mdsc =
3611 container_of(work, struct ceph_mds_client, delayed_work.work);
3612 int renew_interval;
3613 int renew_caps;
3614
3615 dout("mdsc delayed_work\n");
3616 ceph_check_delayed_caps(mdsc);
3617
3618 mutex_lock(&mdsc->mutex);
3619 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3620 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3621 mdsc->last_renew_caps);
3622 if (renew_caps)
3623 mdsc->last_renew_caps = jiffies;
3624
3625 for (i = 0; i < mdsc->max_sessions; i++) {
3626 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3627 if (!s)
3628 continue;
3629 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3630 dout("resending session close request for mds%d\n",
3631 s->s_mds);
3632 request_close_session(mdsc, s);
3633 ceph_put_mds_session(s);
3634 continue;
3635 }
3636 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3637 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3638 s->s_state = CEPH_MDS_SESSION_HUNG;
3639 pr_info("mds%d hung\n", s->s_mds);
3640 }
3641 }
3642 if (s->s_state == CEPH_MDS_SESSION_NEW ||
3643 s->s_state == CEPH_MDS_SESSION_RESTARTING ||
3644 s->s_state == CEPH_MDS_SESSION_REJECTED) {
3645 /* this mds is failed or recovering, just wait */
3646 ceph_put_mds_session(s);
3647 continue;
3648 }
3649 mutex_unlock(&mdsc->mutex);
3650
3651 mutex_lock(&s->s_mutex);
3652 if (renew_caps)
3653 send_renew_caps(mdsc, s);
3654 else
3655 ceph_con_keepalive(&s->s_con);
3656 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3657 s->s_state == CEPH_MDS_SESSION_HUNG)
3658 ceph_send_cap_releases(mdsc, s);
3659 mutex_unlock(&s->s_mutex);
3660 ceph_put_mds_session(s);
3661
3662 mutex_lock(&mdsc->mutex);
3663 }
3664 mutex_unlock(&mdsc->mutex);
3665
3666 schedule_delayed(mdsc);
3667 }
3668
3669 int ceph_mdsc_init(struct ceph_fs_client *fsc)
3670
3671 {
3672 struct ceph_mds_client *mdsc;
3673
3674 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3675 if (!mdsc)
3676 return -ENOMEM;
3677 mdsc->fsc = fsc;
3678 mutex_init(&mdsc->mutex);
3679 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3680 if (!mdsc->mdsmap) {
3681 kfree(mdsc);
3682 return -ENOMEM;
3683 }
3684
3685 fsc->mdsc = mdsc;
3686 init_completion(&mdsc->safe_umount_waiters);
3687 init_waitqueue_head(&mdsc->session_close_wq);
3688 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3689 mdsc->sessions = NULL;
3690 atomic_set(&mdsc->num_sessions, 0);
3691 mdsc->max_sessions = 0;
3692 mdsc->stopping = 0;
3693 atomic64_set(&mdsc->quotarealms_count, 0);
3694 mdsc->last_snap_seq = 0;
3695 init_rwsem(&mdsc->snap_rwsem);
3696 mdsc->snap_realms = RB_ROOT;
3697 INIT_LIST_HEAD(&mdsc->snap_empty);
3698 spin_lock_init(&mdsc->snap_empty_lock);
3699 mdsc->last_tid = 0;
3700 mdsc->oldest_tid = 0;
3701 mdsc->request_tree = RB_ROOT;
3702 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3703 mdsc->last_renew_caps = jiffies;
3704 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3705 spin_lock_init(&mdsc->cap_delay_lock);
3706 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3707 spin_lock_init(&mdsc->snap_flush_lock);
3708 mdsc->last_cap_flush_tid = 1;
3709 INIT_LIST_HEAD(&mdsc->cap_flush_list);
3710 INIT_LIST_HEAD(&mdsc->cap_dirty);
3711 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3712 mdsc->num_cap_flushing = 0;
3713 spin_lock_init(&mdsc->cap_dirty_lock);
3714 init_waitqueue_head(&mdsc->cap_flushing_wq);
3715 spin_lock_init(&mdsc->dentry_lru_lock);
3716 INIT_LIST_HEAD(&mdsc->dentry_lru);
3717
3718 ceph_caps_init(mdsc);
3719 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3720
3721 init_rwsem(&mdsc->pool_perm_rwsem);
3722 mdsc->pool_perm_tree = RB_ROOT;
3723
3724 strscpy(mdsc->nodename, utsname()->nodename,
3725 sizeof(mdsc->nodename));
3726 return 0;
3727 }
3728
3729 /*
3730 * Wait for safe replies on open mds requests. If we time out, drop
3731 * all requests from the tree to avoid dangling dentry refs.
3732 */
3733 static void wait_requests(struct ceph_mds_client *mdsc)
3734 {
3735 struct ceph_options *opts = mdsc->fsc->client->options;
3736 struct ceph_mds_request *req;
3737
3738 mutex_lock(&mdsc->mutex);
3739 if (__get_oldest_req(mdsc)) {
3740 mutex_unlock(&mdsc->mutex);
3741
3742 dout("wait_requests waiting for requests\n");
3743 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3744 ceph_timeout_jiffies(opts->mount_timeout));
3745
3746 /* tear down remaining requests */
3747 mutex_lock(&mdsc->mutex);
3748 while ((req = __get_oldest_req(mdsc))) {
3749 dout("wait_requests timed out on tid %llu\n",
3750 req->r_tid);
3751 __unregister_request(mdsc, req);
3752 }
3753 }
3754 mutex_unlock(&mdsc->mutex);
3755 dout("wait_requests done\n");
3756 }
3757
3758 /*
3759 * called before mount is ro, and before dentries are torn down.
3760 * (hmm, does this still race with new lookups?)
3761 */
3762 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3763 {
3764 dout("pre_umount\n");
3765 mdsc->stopping = 1;
3766
3767 lock_unlock_sessions(mdsc);
3768 ceph_flush_dirty_caps(mdsc);
3769 wait_requests(mdsc);
3770
3771 /*
3772 * wait for reply handlers to drop their request refs and
3773 * their inode/dcache refs
3774 */
3775 ceph_msgr_flush();
3776 }
3777
3778 /*
3779 * wait for all write mds requests to flush.
3780 */
3781 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3782 {
3783 struct ceph_mds_request *req = NULL, *nextreq;
3784 struct rb_node *n;
3785
3786 mutex_lock(&mdsc->mutex);
3787 dout("wait_unsafe_requests want %lld\n", want_tid);
3788 restart:
3789 req = __get_oldest_req(mdsc);
3790 while (req && req->r_tid <= want_tid) {
3791 /* find next request */
3792 n = rb_next(&req->r_node);
3793 if (n)
3794 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3795 else
3796 nextreq = NULL;
3797 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3798 (req->r_op & CEPH_MDS_OP_WRITE)) {
3799 /* write op */
3800 ceph_mdsc_get_request(req);
3801 if (nextreq)
3802 ceph_mdsc_get_request(nextreq);
3803 mutex_unlock(&mdsc->mutex);
3804 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3805 req->r_tid, want_tid);
3806 wait_for_completion(&req->r_safe_completion);
3807 mutex_lock(&mdsc->mutex);
3808 ceph_mdsc_put_request(req);
3809 if (!nextreq)
3810 break; /* next dne before, so we're done! */
3811 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3812 /* next request was removed from tree */
3813 ceph_mdsc_put_request(nextreq);
3814 goto restart;
3815 }
3816 ceph_mdsc_put_request(nextreq); /* won't go away */
3817 }
3818 req = nextreq;
3819 }
3820 mutex_unlock(&mdsc->mutex);
3821 dout("wait_unsafe_requests done\n");
3822 }
3823
3824 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3825 {
3826 u64 want_tid, want_flush;
3827
3828 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3829 return;
3830
3831 dout("sync\n");
3832 mutex_lock(&mdsc->mutex);
3833 want_tid = mdsc->last_tid;
3834 mutex_unlock(&mdsc->mutex);
3835
3836 ceph_flush_dirty_caps(mdsc);
3837 spin_lock(&mdsc->cap_dirty_lock);
3838 want_flush = mdsc->last_cap_flush_tid;
3839 if (!list_empty(&mdsc->cap_flush_list)) {
3840 struct ceph_cap_flush *cf =
3841 list_last_entry(&mdsc->cap_flush_list,
3842 struct ceph_cap_flush, g_list);
3843 cf->wake = true;
3844 }
3845 spin_unlock(&mdsc->cap_dirty_lock);
3846
3847 dout("sync want tid %lld flush_seq %lld\n",
3848 want_tid, want_flush);
3849
3850 wait_unsafe_requests(mdsc, want_tid);
3851 wait_caps_flush(mdsc, want_flush);
3852 }
3853
3854 /*
3855 * true if all sessions are closed, or we force unmount
3856 */
3857 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
3858 {
3859 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3860 return true;
3861 return atomic_read(&mdsc->num_sessions) <= skipped;
3862 }
3863
3864 /*
3865 * called after sb is ro.
3866 */
3867 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3868 {
3869 struct ceph_options *opts = mdsc->fsc->client->options;
3870 struct ceph_mds_session *session;
3871 int i;
3872 int skipped = 0;
3873
3874 dout("close_sessions\n");
3875
3876 /* close sessions */
3877 mutex_lock(&mdsc->mutex);
3878 for (i = 0; i < mdsc->max_sessions; i++) {
3879 session = __ceph_lookup_mds_session(mdsc, i);
3880 if (!session)
3881 continue;
3882 mutex_unlock(&mdsc->mutex);
3883 mutex_lock(&session->s_mutex);
3884 if (__close_session(mdsc, session) <= 0)
3885 skipped++;
3886 mutex_unlock(&session->s_mutex);
3887 ceph_put_mds_session(session);
3888 mutex_lock(&mdsc->mutex);
3889 }
3890 mutex_unlock(&mdsc->mutex);
3891
3892 dout("waiting for sessions to close\n");
3893 wait_event_timeout(mdsc->session_close_wq,
3894 done_closing_sessions(mdsc, skipped),
3895 ceph_timeout_jiffies(opts->mount_timeout));
3896
3897 /* tear down remaining sessions */
3898 mutex_lock(&mdsc->mutex);
3899 for (i = 0; i < mdsc->max_sessions; i++) {
3900 if (mdsc->sessions[i]) {
3901 session = get_session(mdsc->sessions[i]);
3902 __unregister_session(mdsc, session);
3903 mutex_unlock(&mdsc->mutex);
3904 mutex_lock(&session->s_mutex);
3905 remove_session_caps(session);
3906 mutex_unlock(&session->s_mutex);
3907 ceph_put_mds_session(session);
3908 mutex_lock(&mdsc->mutex);
3909 }
3910 }
3911 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3912 mutex_unlock(&mdsc->mutex);
3913
3914 ceph_cleanup_empty_realms(mdsc);
3915
3916 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3917
3918 dout("stopped\n");
3919 }
3920
3921 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3922 {
3923 struct ceph_mds_session *session;
3924 int mds;
3925
3926 dout("force umount\n");
3927
3928 mutex_lock(&mdsc->mutex);
3929 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3930 session = __ceph_lookup_mds_session(mdsc, mds);
3931 if (!session)
3932 continue;
3933 mutex_unlock(&mdsc->mutex);
3934 mutex_lock(&session->s_mutex);
3935 __close_session(mdsc, session);
3936 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3937 cleanup_session_requests(mdsc, session);
3938 remove_session_caps(session);
3939 }
3940 mutex_unlock(&session->s_mutex);
3941 ceph_put_mds_session(session);
3942 mutex_lock(&mdsc->mutex);
3943 kick_requests(mdsc, mds);
3944 }
3945 __wake_requests(mdsc, &mdsc->waiting_for_map);
3946 mutex_unlock(&mdsc->mutex);
3947 }
3948
3949 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3950 {
3951 dout("stop\n");
3952 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3953 if (mdsc->mdsmap)
3954 ceph_mdsmap_destroy(mdsc->mdsmap);
3955 kfree(mdsc->sessions);
3956 ceph_caps_finalize(mdsc);
3957 ceph_pool_perm_destroy(mdsc);
3958 }
3959
3960 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3961 {
3962 struct ceph_mds_client *mdsc = fsc->mdsc;
3963 dout("mdsc_destroy %p\n", mdsc);
3964
3965 if (!mdsc)
3966 return;
3967
3968 /* flush out any connection work with references to us */
3969 ceph_msgr_flush();
3970
3971 ceph_mdsc_stop(mdsc);
3972
3973 fsc->mdsc = NULL;
3974 kfree(mdsc);
3975 dout("mdsc_destroy %p done\n", mdsc);
3976 }
3977
3978 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3979 {
3980 struct ceph_fs_client *fsc = mdsc->fsc;
3981 const char *mds_namespace = fsc->mount_options->mds_namespace;
3982 void *p = msg->front.iov_base;
3983 void *end = p + msg->front.iov_len;
3984 u32 epoch;
3985 u32 map_len;
3986 u32 num_fs;
3987 u32 mount_fscid = (u32)-1;
3988 u8 struct_v, struct_cv;
3989 int err = -EINVAL;
3990
3991 ceph_decode_need(&p, end, sizeof(u32), bad);
3992 epoch = ceph_decode_32(&p);
3993
3994 dout("handle_fsmap epoch %u\n", epoch);
3995
3996 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3997 struct_v = ceph_decode_8(&p);
3998 struct_cv = ceph_decode_8(&p);
3999 map_len = ceph_decode_32(&p);
4000
4001 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
4002 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
4003
4004 num_fs = ceph_decode_32(&p);
4005 while (num_fs-- > 0) {
4006 void *info_p, *info_end;
4007 u32 info_len;
4008 u8 info_v, info_cv;
4009 u32 fscid, namelen;
4010
4011 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4012 info_v = ceph_decode_8(&p);
4013 info_cv = ceph_decode_8(&p);
4014 info_len = ceph_decode_32(&p);
4015 ceph_decode_need(&p, end, info_len, bad);
4016 info_p = p;
4017 info_end = p + info_len;
4018 p = info_end;
4019
4020 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
4021 fscid = ceph_decode_32(&info_p);
4022 namelen = ceph_decode_32(&info_p);
4023 ceph_decode_need(&info_p, info_end, namelen, bad);
4024
4025 if (mds_namespace &&
4026 strlen(mds_namespace) == namelen &&
4027 !strncmp(mds_namespace, (char *)info_p, namelen)) {
4028 mount_fscid = fscid;
4029 break;
4030 }
4031 }
4032
4033 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
4034 if (mount_fscid != (u32)-1) {
4035 fsc->client->monc.fs_cluster_id = mount_fscid;
4036 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
4037 0, true);
4038 ceph_monc_renew_subs(&fsc->client->monc);
4039 } else {
4040 err = -ENOENT;
4041 goto err_out;
4042 }
4043 return;
4044
4045 bad:
4046 pr_err("error decoding fsmap\n");
4047 err_out:
4048 mutex_lock(&mdsc->mutex);
4049 mdsc->mdsmap_err = err;
4050 __wake_requests(mdsc, &mdsc->waiting_for_map);
4051 mutex_unlock(&mdsc->mutex);
4052 }
4053
4054 /*
4055 * handle mds map update.
4056 */
4057 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4058 {
4059 u32 epoch;
4060 u32 maplen;
4061 void *p = msg->front.iov_base;
4062 void *end = p + msg->front.iov_len;
4063 struct ceph_mdsmap *newmap, *oldmap;
4064 struct ceph_fsid fsid;
4065 int err = -EINVAL;
4066
4067 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
4068 ceph_decode_copy(&p, &fsid, sizeof(fsid));
4069 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
4070 return;
4071 epoch = ceph_decode_32(&p);
4072 maplen = ceph_decode_32(&p);
4073 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
4074
4075 /* do we need it? */
4076 mutex_lock(&mdsc->mutex);
4077 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
4078 dout("handle_map epoch %u <= our %u\n",
4079 epoch, mdsc->mdsmap->m_epoch);
4080 mutex_unlock(&mdsc->mutex);
4081 return;
4082 }
4083
4084 newmap = ceph_mdsmap_decode(&p, end);
4085 if (IS_ERR(newmap)) {
4086 err = PTR_ERR(newmap);
4087 goto bad_unlock;
4088 }
4089
4090 /* swap into place */
4091 if (mdsc->mdsmap) {
4092 oldmap = mdsc->mdsmap;
4093 mdsc->mdsmap = newmap;
4094 check_new_map(mdsc, newmap, oldmap);
4095 ceph_mdsmap_destroy(oldmap);
4096 } else {
4097 mdsc->mdsmap = newmap; /* first mds map */
4098 }
4099 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
4100 MAX_LFS_FILESIZE);
4101
4102 __wake_requests(mdsc, &mdsc->waiting_for_map);
4103 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
4104 mdsc->mdsmap->m_epoch);
4105
4106 mutex_unlock(&mdsc->mutex);
4107 schedule_delayed(mdsc);
4108 return;
4109
4110 bad_unlock:
4111 mutex_unlock(&mdsc->mutex);
4112 bad:
4113 pr_err("error decoding mdsmap %d\n", err);
4114 return;
4115 }
4116
4117 static struct ceph_connection *con_get(struct ceph_connection *con)
4118 {
4119 struct ceph_mds_session *s = con->private;
4120
4121 if (get_session(s)) {
4122 dout("mdsc con_get %p ok (%d)\n", s, refcount_read(&s->s_ref));
4123 return con;
4124 }
4125 dout("mdsc con_get %p FAIL\n", s);
4126 return NULL;
4127 }
4128
4129 static void con_put(struct ceph_connection *con)
4130 {
4131 struct ceph_mds_session *s = con->private;
4132
4133 dout("mdsc con_put %p (%d)\n", s, refcount_read(&s->s_ref) - 1);
4134 ceph_put_mds_session(s);
4135 }
4136
4137 /*
4138 * if the client is unresponsive for long enough, the mds will kill
4139 * the session entirely.
4140 */
4141 static void peer_reset(struct ceph_connection *con)
4142 {
4143 struct ceph_mds_session *s = con->private;
4144 struct ceph_mds_client *mdsc = s->s_mdsc;
4145
4146 pr_warn("mds%d closed our session\n", s->s_mds);
4147 send_mds_reconnect(mdsc, s);
4148 }
4149
4150 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
4151 {
4152 struct ceph_mds_session *s = con->private;
4153 struct ceph_mds_client *mdsc = s->s_mdsc;
4154 int type = le16_to_cpu(msg->hdr.type);
4155
4156 mutex_lock(&mdsc->mutex);
4157 if (__verify_registered_session(mdsc, s) < 0) {
4158 mutex_unlock(&mdsc->mutex);
4159 goto out;
4160 }
4161 mutex_unlock(&mdsc->mutex);
4162
4163 switch (type) {
4164 case CEPH_MSG_MDS_MAP:
4165 ceph_mdsc_handle_mdsmap(mdsc, msg);
4166 break;
4167 case CEPH_MSG_FS_MAP_USER:
4168 ceph_mdsc_handle_fsmap(mdsc, msg);
4169 break;
4170 case CEPH_MSG_CLIENT_SESSION:
4171 handle_session(s, msg);
4172 break;
4173 case CEPH_MSG_CLIENT_REPLY:
4174 handle_reply(s, msg);
4175 break;
4176 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
4177 handle_forward(mdsc, s, msg);
4178 break;
4179 case CEPH_MSG_CLIENT_CAPS:
4180 ceph_handle_caps(s, msg);
4181 break;
4182 case CEPH_MSG_CLIENT_SNAP:
4183 ceph_handle_snap(mdsc, s, msg);
4184 break;
4185 case CEPH_MSG_CLIENT_LEASE:
4186 handle_lease(mdsc, s, msg);
4187 break;
4188 case CEPH_MSG_CLIENT_QUOTA:
4189 ceph_handle_quota(mdsc, s, msg);
4190 break;
4191
4192 default:
4193 pr_err("received unknown message type %d %s\n", type,
4194 ceph_msg_type_name(type));
4195 }
4196 out:
4197 ceph_msg_put(msg);
4198 }
4199
4200 /*
4201 * authentication
4202 */
4203
4204 /*
4205 * Note: returned pointer is the address of a structure that's
4206 * managed separately. Caller must *not* attempt to free it.
4207 */
4208 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
4209 int *proto, int force_new)
4210 {
4211 struct ceph_mds_session *s = con->private;
4212 struct ceph_mds_client *mdsc = s->s_mdsc;
4213 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4214 struct ceph_auth_handshake *auth = &s->s_auth;
4215
4216 if (force_new && auth->authorizer) {
4217 ceph_auth_destroy_authorizer(auth->authorizer);
4218 auth->authorizer = NULL;
4219 }
4220 if (!auth->authorizer) {
4221 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4222 auth);
4223 if (ret)
4224 return ERR_PTR(ret);
4225 } else {
4226 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4227 auth);
4228 if (ret)
4229 return ERR_PTR(ret);
4230 }
4231 *proto = ac->protocol;
4232
4233 return auth;
4234 }
4235
4236 static int add_authorizer_challenge(struct ceph_connection *con,
4237 void *challenge_buf, int challenge_buf_len)
4238 {
4239 struct ceph_mds_session *s = con->private;
4240 struct ceph_mds_client *mdsc = s->s_mdsc;
4241 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4242
4243 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
4244 challenge_buf, challenge_buf_len);
4245 }
4246
4247 static int verify_authorizer_reply(struct ceph_connection *con)
4248 {
4249 struct ceph_mds_session *s = con->private;
4250 struct ceph_mds_client *mdsc = s->s_mdsc;
4251 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4252
4253 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
4254 }
4255
4256 static int invalidate_authorizer(struct ceph_connection *con)
4257 {
4258 struct ceph_mds_session *s = con->private;
4259 struct ceph_mds_client *mdsc = s->s_mdsc;
4260 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4261
4262 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
4263
4264 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
4265 }
4266
4267 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
4268 struct ceph_msg_header *hdr, int *skip)
4269 {
4270 struct ceph_msg *msg;
4271 int type = (int) le16_to_cpu(hdr->type);
4272 int front_len = (int) le32_to_cpu(hdr->front_len);
4273
4274 if (con->in_msg)
4275 return con->in_msg;
4276
4277 *skip = 0;
4278 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
4279 if (!msg) {
4280 pr_err("unable to allocate msg type %d len %d\n",
4281 type, front_len);
4282 return NULL;
4283 }
4284
4285 return msg;
4286 }
4287
4288 static int mds_sign_message(struct ceph_msg *msg)
4289 {
4290 struct ceph_mds_session *s = msg->con->private;
4291 struct ceph_auth_handshake *auth = &s->s_auth;
4292
4293 return ceph_auth_sign_message(auth, msg);
4294 }
4295
4296 static int mds_check_message_signature(struct ceph_msg *msg)
4297 {
4298 struct ceph_mds_session *s = msg->con->private;
4299 struct ceph_auth_handshake *auth = &s->s_auth;
4300
4301 return ceph_auth_check_message_signature(auth, msg);
4302 }
4303
4304 static const struct ceph_connection_operations mds_con_ops = {
4305 .get = con_get,
4306 .put = con_put,
4307 .dispatch = dispatch,
4308 .get_authorizer = get_authorizer,
4309 .add_authorizer_challenge = add_authorizer_challenge,
4310 .verify_authorizer_reply = verify_authorizer_reply,
4311 .invalidate_authorizer = invalidate_authorizer,
4312 .peer_reset = peer_reset,
4313 .alloc_msg = mds_alloc_msg,
4314 .sign_message = mds_sign_message,
4315 .check_message_signature = mds_check_message_signature,
4316 };
4317
4318 /* eof */
Linux with added FPC-III support