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1#include <linux/ceph/ceph_debug.h>
2
3#include <linux/fs.h>
4#include <linux/wait.h>
5#include <linux/slab.h>
6#include <linux/sched.h>
7#include <linux/debugfs.h>
8#include <linux/seq_file.h>
9
10#include "super.h"
11#include "mds_client.h"
12
13#include <linux/ceph/messenger.h>
14#include <linux/ceph/decode.h>
15#include <linux/ceph/pagelist.h>
16#include <linux/ceph/auth.h>
17#include <linux/ceph/debugfs.h>
18
19/*
20 * A cluster of MDS (metadata server) daemons is responsible for
21 * managing the file system namespace (the directory hierarchy and
22 * inodes) and for coordinating shared access to storage. Metadata is
23 * partitioning hierarchically across a number of servers, and that
24 * partition varies over time as the cluster adjusts the distribution
25 * in order to balance load.
26 *
27 * The MDS client is primarily responsible to managing synchronous
28 * metadata requests for operations like open, unlink, and so forth.
29 * If there is a MDS failure, we find out about it when we (possibly
30 * request and) receive a new MDS map, and can resubmit affected
31 * requests.
32 *
33 * For the most part, though, we take advantage of a lossless
34 * communications channel to the MDS, and do not need to worry about
35 * timing out or resubmitting requests.
36 *
37 * We maintain a stateful "session" with each MDS we interact with.
38 * Within each session, we sent periodic heartbeat messages to ensure
39 * any capabilities or leases we have been issues remain valid. If
40 * the session times out and goes stale, our leases and capabilities
41 * are no longer valid.
42 */
43
44struct ceph_reconnect_state {
45 struct ceph_pagelist *pagelist;
46 bool flock;
47};
48
49static void __wake_requests(struct ceph_mds_client *mdsc,
50 struct list_head *head);
51
52static const struct ceph_connection_operations mds_con_ops;
53
54
55/*
56 * mds reply parsing
57 */
58
59/*
60 * parse individual inode info
61 */
62static int parse_reply_info_in(void **p, void *end,
63 struct ceph_mds_reply_info_in *info,
64 int features)
65{
66 int err = -EIO;
67
68 info->in = *p;
69 *p += sizeof(struct ceph_mds_reply_inode) +
70 sizeof(*info->in->fragtree.splits) *
71 le32_to_cpu(info->in->fragtree.nsplits);
72
73 ceph_decode_32_safe(p, end, info->symlink_len, bad);
74 ceph_decode_need(p, end, info->symlink_len, bad);
75 info->symlink = *p;
76 *p += info->symlink_len;
77
78 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
79 ceph_decode_copy_safe(p, end, &info->dir_layout,
80 sizeof(info->dir_layout), bad);
81 else
82 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
83
84 ceph_decode_32_safe(p, end, info->xattr_len, bad);
85 ceph_decode_need(p, end, info->xattr_len, bad);
86 info->xattr_data = *p;
87 *p += info->xattr_len;
88 return 0;
89bad:
90 return err;
91}
92
93/*
94 * parse a normal reply, which may contain a (dir+)dentry and/or a
95 * target inode.
96 */
97static int parse_reply_info_trace(void **p, void *end,
98 struct ceph_mds_reply_info_parsed *info,
99 int features)
100{
101 int err;
102
103 if (info->head->is_dentry) {
104 err = parse_reply_info_in(p, end, &info->diri, features);
105 if (err < 0)
106 goto out_bad;
107
108 if (unlikely(*p + sizeof(*info->dirfrag) > end))
109 goto bad;
110 info->dirfrag = *p;
111 *p += sizeof(*info->dirfrag) +
112 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
113 if (unlikely(*p > end))
114 goto bad;
115
116 ceph_decode_32_safe(p, end, info->dname_len, bad);
117 ceph_decode_need(p, end, info->dname_len, bad);
118 info->dname = *p;
119 *p += info->dname_len;
120 info->dlease = *p;
121 *p += sizeof(*info->dlease);
122 }
123
124 if (info->head->is_target) {
125 err = parse_reply_info_in(p, end, &info->targeti, features);
126 if (err < 0)
127 goto out_bad;
128 }
129
130 if (unlikely(*p != end))
131 goto bad;
132 return 0;
133
134bad:
135 err = -EIO;
136out_bad:
137 pr_err("problem parsing mds trace %d\n", err);
138 return err;
139}
140
141/*
142 * parse readdir results
143 */
144static int parse_reply_info_dir(void **p, void *end,
145 struct ceph_mds_reply_info_parsed *info,
146 int features)
147{
148 u32 num, i = 0;
149 int err;
150
151 info->dir_dir = *p;
152 if (*p + sizeof(*info->dir_dir) > end)
153 goto bad;
154 *p += sizeof(*info->dir_dir) +
155 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
156 if (*p > end)
157 goto bad;
158
159 ceph_decode_need(p, end, sizeof(num) + 2, bad);
160 num = ceph_decode_32(p);
161 info->dir_end = ceph_decode_8(p);
162 info->dir_complete = ceph_decode_8(p);
163 if (num == 0)
164 goto done;
165
166 /* alloc large array */
167 info->dir_nr = num;
168 info->dir_in = kcalloc(num, sizeof(*info->dir_in) +
169 sizeof(*info->dir_dname) +
170 sizeof(*info->dir_dname_len) +
171 sizeof(*info->dir_dlease),
172 GFP_NOFS);
173 if (info->dir_in == NULL) {
174 err = -ENOMEM;
175 goto out_bad;
176 }
177 info->dir_dname = (void *)(info->dir_in + num);
178 info->dir_dname_len = (void *)(info->dir_dname + num);
179 info->dir_dlease = (void *)(info->dir_dname_len + num);
180
181 while (num) {
182 /* dentry */
183 ceph_decode_need(p, end, sizeof(u32)*2, bad);
184 info->dir_dname_len[i] = ceph_decode_32(p);
185 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
186 info->dir_dname[i] = *p;
187 *p += info->dir_dname_len[i];
188 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
189 info->dir_dname[i]);
190 info->dir_dlease[i] = *p;
191 *p += sizeof(struct ceph_mds_reply_lease);
192
193 /* inode */
194 err = parse_reply_info_in(p, end, &info->dir_in[i], features);
195 if (err < 0)
196 goto out_bad;
197 i++;
198 num--;
199 }
200
201done:
202 if (*p != end)
203 goto bad;
204 return 0;
205
206bad:
207 err = -EIO;
208out_bad:
209 pr_err("problem parsing dir contents %d\n", err);
210 return err;
211}
212
213/*
214 * parse fcntl F_GETLK results
215 */
216static int parse_reply_info_filelock(void **p, void *end,
217 struct ceph_mds_reply_info_parsed *info,
218 int features)
219{
220 if (*p + sizeof(*info->filelock_reply) > end)
221 goto bad;
222
223 info->filelock_reply = *p;
224 *p += sizeof(*info->filelock_reply);
225
226 if (unlikely(*p != end))
227 goto bad;
228 return 0;
229
230bad:
231 return -EIO;
232}
233
234/*
235 * parse extra results
236 */
237static int parse_reply_info_extra(void **p, void *end,
238 struct ceph_mds_reply_info_parsed *info,
239 int features)
240{
241 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
242 return parse_reply_info_filelock(p, end, info, features);
243 else
244 return parse_reply_info_dir(p, end, info, features);
245}
246
247/*
248 * parse entire mds reply
249 */
250static int parse_reply_info(struct ceph_msg *msg,
251 struct ceph_mds_reply_info_parsed *info,
252 int features)
253{
254 void *p, *end;
255 u32 len;
256 int err;
257
258 info->head = msg->front.iov_base;
259 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
260 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
261
262 /* trace */
263 ceph_decode_32_safe(&p, end, len, bad);
264 if (len > 0) {
265 ceph_decode_need(&p, end, len, bad);
266 err = parse_reply_info_trace(&p, p+len, info, features);
267 if (err < 0)
268 goto out_bad;
269 }
270
271 /* extra */
272 ceph_decode_32_safe(&p, end, len, bad);
273 if (len > 0) {
274 ceph_decode_need(&p, end, len, bad);
275 err = parse_reply_info_extra(&p, p+len, info, features);
276 if (err < 0)
277 goto out_bad;
278 }
279
280 /* snap blob */
281 ceph_decode_32_safe(&p, end, len, bad);
282 info->snapblob_len = len;
283 info->snapblob = p;
284 p += len;
285
286 if (p != end)
287 goto bad;
288 return 0;
289
290bad:
291 err = -EIO;
292out_bad:
293 pr_err("mds parse_reply err %d\n", err);
294 return err;
295}
296
297static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
298{
299 kfree(info->dir_in);
300}
301
302
303/*
304 * sessions
305 */
306static const char *session_state_name(int s)
307{
308 switch (s) {
309 case CEPH_MDS_SESSION_NEW: return "new";
310 case CEPH_MDS_SESSION_OPENING: return "opening";
311 case CEPH_MDS_SESSION_OPEN: return "open";
312 case CEPH_MDS_SESSION_HUNG: return "hung";
313 case CEPH_MDS_SESSION_CLOSING: return "closing";
314 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
315 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
316 default: return "???";
317 }
318}
319
320static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
321{
322 if (atomic_inc_not_zero(&s->s_ref)) {
323 dout("mdsc get_session %p %d -> %d\n", s,
324 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
325 return s;
326 } else {
327 dout("mdsc get_session %p 0 -- FAIL", s);
328 return NULL;
329 }
330}
331
332void ceph_put_mds_session(struct ceph_mds_session *s)
333{
334 dout("mdsc put_session %p %d -> %d\n", s,
335 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
336 if (atomic_dec_and_test(&s->s_ref)) {
337 if (s->s_auth.authorizer)
338 s->s_mdsc->fsc->client->monc.auth->ops->destroy_authorizer(
339 s->s_mdsc->fsc->client->monc.auth,
340 s->s_auth.authorizer);
341 kfree(s);
342 }
343}
344
345/*
346 * called under mdsc->mutex
347 */
348struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
349 int mds)
350{
351 struct ceph_mds_session *session;
352
353 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
354 return NULL;
355 session = mdsc->sessions[mds];
356 dout("lookup_mds_session %p %d\n", session,
357 atomic_read(&session->s_ref));
358 get_session(session);
359 return session;
360}
361
362static bool __have_session(struct ceph_mds_client *mdsc, int mds)
363{
364 if (mds >= mdsc->max_sessions)
365 return false;
366 return mdsc->sessions[mds];
367}
368
369static int __verify_registered_session(struct ceph_mds_client *mdsc,
370 struct ceph_mds_session *s)
371{
372 if (s->s_mds >= mdsc->max_sessions ||
373 mdsc->sessions[s->s_mds] != s)
374 return -ENOENT;
375 return 0;
376}
377
378/*
379 * create+register a new session for given mds.
380 * called under mdsc->mutex.
381 */
382static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
383 int mds)
384{
385 struct ceph_mds_session *s;
386
387 s = kzalloc(sizeof(*s), GFP_NOFS);
388 if (!s)
389 return ERR_PTR(-ENOMEM);
390 s->s_mdsc = mdsc;
391 s->s_mds = mds;
392 s->s_state = CEPH_MDS_SESSION_NEW;
393 s->s_ttl = 0;
394 s->s_seq = 0;
395 mutex_init(&s->s_mutex);
396
397 ceph_con_init(mdsc->fsc->client->msgr, &s->s_con);
398 s->s_con.private = s;
399 s->s_con.ops = &mds_con_ops;
400 s->s_con.peer_name.type = CEPH_ENTITY_TYPE_MDS;
401 s->s_con.peer_name.num = cpu_to_le64(mds);
402
403 spin_lock_init(&s->s_gen_ttl_lock);
404 s->s_cap_gen = 0;
405 s->s_cap_ttl = jiffies - 1;
406
407 spin_lock_init(&s->s_cap_lock);
408 s->s_renew_requested = 0;
409 s->s_renew_seq = 0;
410 INIT_LIST_HEAD(&s->s_caps);
411 s->s_nr_caps = 0;
412 s->s_trim_caps = 0;
413 atomic_set(&s->s_ref, 1);
414 INIT_LIST_HEAD(&s->s_waiting);
415 INIT_LIST_HEAD(&s->s_unsafe);
416 s->s_num_cap_releases = 0;
417 s->s_cap_iterator = NULL;
418 INIT_LIST_HEAD(&s->s_cap_releases);
419 INIT_LIST_HEAD(&s->s_cap_releases_done);
420 INIT_LIST_HEAD(&s->s_cap_flushing);
421 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
422
423 dout("register_session mds%d\n", mds);
424 if (mds >= mdsc->max_sessions) {
425 int newmax = 1 << get_count_order(mds+1);
426 struct ceph_mds_session **sa;
427
428 dout("register_session realloc to %d\n", newmax);
429 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
430 if (sa == NULL)
431 goto fail_realloc;
432 if (mdsc->sessions) {
433 memcpy(sa, mdsc->sessions,
434 mdsc->max_sessions * sizeof(void *));
435 kfree(mdsc->sessions);
436 }
437 mdsc->sessions = sa;
438 mdsc->max_sessions = newmax;
439 }
440 mdsc->sessions[mds] = s;
441 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
442
443 ceph_con_open(&s->s_con, ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
444
445 return s;
446
447fail_realloc:
448 kfree(s);
449 return ERR_PTR(-ENOMEM);
450}
451
452/*
453 * called under mdsc->mutex
454 */
455static void __unregister_session(struct ceph_mds_client *mdsc,
456 struct ceph_mds_session *s)
457{
458 dout("__unregister_session mds%d %p\n", s->s_mds, s);
459 BUG_ON(mdsc->sessions[s->s_mds] != s);
460 mdsc->sessions[s->s_mds] = NULL;
461 ceph_con_close(&s->s_con);
462 ceph_put_mds_session(s);
463}
464
465/*
466 * drop session refs in request.
467 *
468 * should be last request ref, or hold mdsc->mutex
469 */
470static void put_request_session(struct ceph_mds_request *req)
471{
472 if (req->r_session) {
473 ceph_put_mds_session(req->r_session);
474 req->r_session = NULL;
475 }
476}
477
478void ceph_mdsc_release_request(struct kref *kref)
479{
480 struct ceph_mds_request *req = container_of(kref,
481 struct ceph_mds_request,
482 r_kref);
483 if (req->r_request)
484 ceph_msg_put(req->r_request);
485 if (req->r_reply) {
486 ceph_msg_put(req->r_reply);
487 destroy_reply_info(&req->r_reply_info);
488 }
489 if (req->r_inode) {
490 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
491 iput(req->r_inode);
492 }
493 if (req->r_locked_dir)
494 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
495 if (req->r_target_inode)
496 iput(req->r_target_inode);
497 if (req->r_dentry)
498 dput(req->r_dentry);
499 if (req->r_old_dentry) {
500 /*
501 * track (and drop pins for) r_old_dentry_dir
502 * separately, since r_old_dentry's d_parent may have
503 * changed between the dir mutex being dropped and
504 * this request being freed.
505 */
506 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
507 CEPH_CAP_PIN);
508 dput(req->r_old_dentry);
509 iput(req->r_old_dentry_dir);
510 }
511 kfree(req->r_path1);
512 kfree(req->r_path2);
513 put_request_session(req);
514 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
515 kfree(req);
516}
517
518/*
519 * lookup session, bump ref if found.
520 *
521 * called under mdsc->mutex.
522 */
523static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
524 u64 tid)
525{
526 struct ceph_mds_request *req;
527 struct rb_node *n = mdsc->request_tree.rb_node;
528
529 while (n) {
530 req = rb_entry(n, struct ceph_mds_request, r_node);
531 if (tid < req->r_tid)
532 n = n->rb_left;
533 else if (tid > req->r_tid)
534 n = n->rb_right;
535 else {
536 ceph_mdsc_get_request(req);
537 return req;
538 }
539 }
540 return NULL;
541}
542
543static void __insert_request(struct ceph_mds_client *mdsc,
544 struct ceph_mds_request *new)
545{
546 struct rb_node **p = &mdsc->request_tree.rb_node;
547 struct rb_node *parent = NULL;
548 struct ceph_mds_request *req = NULL;
549
550 while (*p) {
551 parent = *p;
552 req = rb_entry(parent, struct ceph_mds_request, r_node);
553 if (new->r_tid < req->r_tid)
554 p = &(*p)->rb_left;
555 else if (new->r_tid > req->r_tid)
556 p = &(*p)->rb_right;
557 else
558 BUG();
559 }
560
561 rb_link_node(&new->r_node, parent, p);
562 rb_insert_color(&new->r_node, &mdsc->request_tree);
563}
564
565/*
566 * Register an in-flight request, and assign a tid. Link to directory
567 * are modifying (if any).
568 *
569 * Called under mdsc->mutex.
570 */
571static void __register_request(struct ceph_mds_client *mdsc,
572 struct ceph_mds_request *req,
573 struct inode *dir)
574{
575 req->r_tid = ++mdsc->last_tid;
576 if (req->r_num_caps)
577 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
578 req->r_num_caps);
579 dout("__register_request %p tid %lld\n", req, req->r_tid);
580 ceph_mdsc_get_request(req);
581 __insert_request(mdsc, req);
582
583 req->r_uid = current_fsuid();
584 req->r_gid = current_fsgid();
585
586 if (dir) {
587 struct ceph_inode_info *ci = ceph_inode(dir);
588
589 ihold(dir);
590 spin_lock(&ci->i_unsafe_lock);
591 req->r_unsafe_dir = dir;
592 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
593 spin_unlock(&ci->i_unsafe_lock);
594 }
595}
596
597static void __unregister_request(struct ceph_mds_client *mdsc,
598 struct ceph_mds_request *req)
599{
600 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
601 rb_erase(&req->r_node, &mdsc->request_tree);
602 RB_CLEAR_NODE(&req->r_node);
603
604 if (req->r_unsafe_dir) {
605 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
606
607 spin_lock(&ci->i_unsafe_lock);
608 list_del_init(&req->r_unsafe_dir_item);
609 spin_unlock(&ci->i_unsafe_lock);
610
611 iput(req->r_unsafe_dir);
612 req->r_unsafe_dir = NULL;
613 }
614
615 ceph_mdsc_put_request(req);
616}
617
618/*
619 * Choose mds to send request to next. If there is a hint set in the
620 * request (e.g., due to a prior forward hint from the mds), use that.
621 * Otherwise, consult frag tree and/or caps to identify the
622 * appropriate mds. If all else fails, choose randomly.
623 *
624 * Called under mdsc->mutex.
625 */
626static struct dentry *get_nonsnap_parent(struct dentry *dentry)
627{
628 /*
629 * we don't need to worry about protecting the d_parent access
630 * here because we never renaming inside the snapped namespace
631 * except to resplice to another snapdir, and either the old or new
632 * result is a valid result.
633 */
634 while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
635 dentry = dentry->d_parent;
636 return dentry;
637}
638
639static int __choose_mds(struct ceph_mds_client *mdsc,
640 struct ceph_mds_request *req)
641{
642 struct inode *inode;
643 struct ceph_inode_info *ci;
644 struct ceph_cap *cap;
645 int mode = req->r_direct_mode;
646 int mds = -1;
647 u32 hash = req->r_direct_hash;
648 bool is_hash = req->r_direct_is_hash;
649
650 /*
651 * is there a specific mds we should try? ignore hint if we have
652 * no session and the mds is not up (active or recovering).
653 */
654 if (req->r_resend_mds >= 0 &&
655 (__have_session(mdsc, req->r_resend_mds) ||
656 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
657 dout("choose_mds using resend_mds mds%d\n",
658 req->r_resend_mds);
659 return req->r_resend_mds;
660 }
661
662 if (mode == USE_RANDOM_MDS)
663 goto random;
664
665 inode = NULL;
666 if (req->r_inode) {
667 inode = req->r_inode;
668 } else if (req->r_dentry) {
669 /* ignore race with rename; old or new d_parent is okay */
670 struct dentry *parent = req->r_dentry->d_parent;
671 struct inode *dir = parent->d_inode;
672
673 if (dir->i_sb != mdsc->fsc->sb) {
674 /* not this fs! */
675 inode = req->r_dentry->d_inode;
676 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
677 /* direct snapped/virtual snapdir requests
678 * based on parent dir inode */
679 struct dentry *dn = get_nonsnap_parent(parent);
680 inode = dn->d_inode;
681 dout("__choose_mds using nonsnap parent %p\n", inode);
682 } else if (req->r_dentry->d_inode) {
683 /* dentry target */
684 inode = req->r_dentry->d_inode;
685 } else {
686 /* dir + name */
687 inode = dir;
688 hash = ceph_dentry_hash(dir, req->r_dentry);
689 is_hash = true;
690 }
691 }
692
693 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
694 (int)hash, mode);
695 if (!inode)
696 goto random;
697 ci = ceph_inode(inode);
698
699 if (is_hash && S_ISDIR(inode->i_mode)) {
700 struct ceph_inode_frag frag;
701 int found;
702
703 ceph_choose_frag(ci, hash, &frag, &found);
704 if (found) {
705 if (mode == USE_ANY_MDS && frag.ndist > 0) {
706 u8 r;
707
708 /* choose a random replica */
709 get_random_bytes(&r, 1);
710 r %= frag.ndist;
711 mds = frag.dist[r];
712 dout("choose_mds %p %llx.%llx "
713 "frag %u mds%d (%d/%d)\n",
714 inode, ceph_vinop(inode),
715 frag.frag, mds,
716 (int)r, frag.ndist);
717 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
718 CEPH_MDS_STATE_ACTIVE)
719 return mds;
720 }
721
722 /* since this file/dir wasn't known to be
723 * replicated, then we want to look for the
724 * authoritative mds. */
725 mode = USE_AUTH_MDS;
726 if (frag.mds >= 0) {
727 /* choose auth mds */
728 mds = frag.mds;
729 dout("choose_mds %p %llx.%llx "
730 "frag %u mds%d (auth)\n",
731 inode, ceph_vinop(inode), frag.frag, mds);
732 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
733 CEPH_MDS_STATE_ACTIVE)
734 return mds;
735 }
736 }
737 }
738
739 spin_lock(&ci->i_ceph_lock);
740 cap = NULL;
741 if (mode == USE_AUTH_MDS)
742 cap = ci->i_auth_cap;
743 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
744 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
745 if (!cap) {
746 spin_unlock(&ci->i_ceph_lock);
747 goto random;
748 }
749 mds = cap->session->s_mds;
750 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
751 inode, ceph_vinop(inode), mds,
752 cap == ci->i_auth_cap ? "auth " : "", cap);
753 spin_unlock(&ci->i_ceph_lock);
754 return mds;
755
756random:
757 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
758 dout("choose_mds chose random mds%d\n", mds);
759 return mds;
760}
761
762
763/*
764 * session messages
765 */
766static struct ceph_msg *create_session_msg(u32 op, u64 seq)
767{
768 struct ceph_msg *msg;
769 struct ceph_mds_session_head *h;
770
771 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
772 false);
773 if (!msg) {
774 pr_err("create_session_msg ENOMEM creating msg\n");
775 return NULL;
776 }
777 h = msg->front.iov_base;
778 h->op = cpu_to_le32(op);
779 h->seq = cpu_to_le64(seq);
780 return msg;
781}
782
783/*
784 * send session open request.
785 *
786 * called under mdsc->mutex
787 */
788static int __open_session(struct ceph_mds_client *mdsc,
789 struct ceph_mds_session *session)
790{
791 struct ceph_msg *msg;
792 int mstate;
793 int mds = session->s_mds;
794
795 /* wait for mds to go active? */
796 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
797 dout("open_session to mds%d (%s)\n", mds,
798 ceph_mds_state_name(mstate));
799 session->s_state = CEPH_MDS_SESSION_OPENING;
800 session->s_renew_requested = jiffies;
801
802 /* send connect message */
803 msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq);
804 if (!msg)
805 return -ENOMEM;
806 ceph_con_send(&session->s_con, msg);
807 return 0;
808}
809
810/*
811 * open sessions for any export targets for the given mds
812 *
813 * called under mdsc->mutex
814 */
815static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
816 struct ceph_mds_session *session)
817{
818 struct ceph_mds_info *mi;
819 struct ceph_mds_session *ts;
820 int i, mds = session->s_mds;
821 int target;
822
823 if (mds >= mdsc->mdsmap->m_max_mds)
824 return;
825 mi = &mdsc->mdsmap->m_info[mds];
826 dout("open_export_target_sessions for mds%d (%d targets)\n",
827 session->s_mds, mi->num_export_targets);
828
829 for (i = 0; i < mi->num_export_targets; i++) {
830 target = mi->export_targets[i];
831 ts = __ceph_lookup_mds_session(mdsc, target);
832 if (!ts) {
833 ts = register_session(mdsc, target);
834 if (IS_ERR(ts))
835 return;
836 }
837 if (session->s_state == CEPH_MDS_SESSION_NEW ||
838 session->s_state == CEPH_MDS_SESSION_CLOSING)
839 __open_session(mdsc, session);
840 else
841 dout(" mds%d target mds%d %p is %s\n", session->s_mds,
842 i, ts, session_state_name(ts->s_state));
843 ceph_put_mds_session(ts);
844 }
845}
846
847void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
848 struct ceph_mds_session *session)
849{
850 mutex_lock(&mdsc->mutex);
851 __open_export_target_sessions(mdsc, session);
852 mutex_unlock(&mdsc->mutex);
853}
854
855/*
856 * session caps
857 */
858
859/*
860 * Free preallocated cap messages assigned to this session
861 */
862static void cleanup_cap_releases(struct ceph_mds_session *session)
863{
864 struct ceph_msg *msg;
865
866 spin_lock(&session->s_cap_lock);
867 while (!list_empty(&session->s_cap_releases)) {
868 msg = list_first_entry(&session->s_cap_releases,
869 struct ceph_msg, list_head);
870 list_del_init(&msg->list_head);
871 ceph_msg_put(msg);
872 }
873 while (!list_empty(&session->s_cap_releases_done)) {
874 msg = list_first_entry(&session->s_cap_releases_done,
875 struct ceph_msg, list_head);
876 list_del_init(&msg->list_head);
877 ceph_msg_put(msg);
878 }
879 spin_unlock(&session->s_cap_lock);
880}
881
882/*
883 * Helper to safely iterate over all caps associated with a session, with
884 * special care taken to handle a racing __ceph_remove_cap().
885 *
886 * Caller must hold session s_mutex.
887 */
888static int iterate_session_caps(struct ceph_mds_session *session,
889 int (*cb)(struct inode *, struct ceph_cap *,
890 void *), void *arg)
891{
892 struct list_head *p;
893 struct ceph_cap *cap;
894 struct inode *inode, *last_inode = NULL;
895 struct ceph_cap *old_cap = NULL;
896 int ret;
897
898 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
899 spin_lock(&session->s_cap_lock);
900 p = session->s_caps.next;
901 while (p != &session->s_caps) {
902 cap = list_entry(p, struct ceph_cap, session_caps);
903 inode = igrab(&cap->ci->vfs_inode);
904 if (!inode) {
905 p = p->next;
906 continue;
907 }
908 session->s_cap_iterator = cap;
909 spin_unlock(&session->s_cap_lock);
910
911 if (last_inode) {
912 iput(last_inode);
913 last_inode = NULL;
914 }
915 if (old_cap) {
916 ceph_put_cap(session->s_mdsc, old_cap);
917 old_cap = NULL;
918 }
919
920 ret = cb(inode, cap, arg);
921 last_inode = inode;
922
923 spin_lock(&session->s_cap_lock);
924 p = p->next;
925 if (cap->ci == NULL) {
926 dout("iterate_session_caps finishing cap %p removal\n",
927 cap);
928 BUG_ON(cap->session != session);
929 list_del_init(&cap->session_caps);
930 session->s_nr_caps--;
931 cap->session = NULL;
932 old_cap = cap; /* put_cap it w/o locks held */
933 }
934 if (ret < 0)
935 goto out;
936 }
937 ret = 0;
938out:
939 session->s_cap_iterator = NULL;
940 spin_unlock(&session->s_cap_lock);
941
942 if (last_inode)
943 iput(last_inode);
944 if (old_cap)
945 ceph_put_cap(session->s_mdsc, old_cap);
946
947 return ret;
948}
949
950static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
951 void *arg)
952{
953 struct ceph_inode_info *ci = ceph_inode(inode);
954 int drop = 0;
955
956 dout("removing cap %p, ci is %p, inode is %p\n",
957 cap, ci, &ci->vfs_inode);
958 spin_lock(&ci->i_ceph_lock);
959 __ceph_remove_cap(cap);
960 if (!__ceph_is_any_real_caps(ci)) {
961 struct ceph_mds_client *mdsc =
962 ceph_sb_to_client(inode->i_sb)->mdsc;
963
964 spin_lock(&mdsc->cap_dirty_lock);
965 if (!list_empty(&ci->i_dirty_item)) {
966 pr_info(" dropping dirty %s state for %p %lld\n",
967 ceph_cap_string(ci->i_dirty_caps),
968 inode, ceph_ino(inode));
969 ci->i_dirty_caps = 0;
970 list_del_init(&ci->i_dirty_item);
971 drop = 1;
972 }
973 if (!list_empty(&ci->i_flushing_item)) {
974 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
975 ceph_cap_string(ci->i_flushing_caps),
976 inode, ceph_ino(inode));
977 ci->i_flushing_caps = 0;
978 list_del_init(&ci->i_flushing_item);
979 mdsc->num_cap_flushing--;
980 drop = 1;
981 }
982 if (drop && ci->i_wrbuffer_ref) {
983 pr_info(" dropping dirty data for %p %lld\n",
984 inode, ceph_ino(inode));
985 ci->i_wrbuffer_ref = 0;
986 ci->i_wrbuffer_ref_head = 0;
987 drop++;
988 }
989 spin_unlock(&mdsc->cap_dirty_lock);
990 }
991 spin_unlock(&ci->i_ceph_lock);
992 while (drop--)
993 iput(inode);
994 return 0;
995}
996
997/*
998 * caller must hold session s_mutex
999 */
1000static void remove_session_caps(struct ceph_mds_session *session)
1001{
1002 dout("remove_session_caps on %p\n", session);
1003 iterate_session_caps(session, remove_session_caps_cb, NULL);
1004 BUG_ON(session->s_nr_caps > 0);
1005 BUG_ON(!list_empty(&session->s_cap_flushing));
1006 cleanup_cap_releases(session);
1007}
1008
1009/*
1010 * wake up any threads waiting on this session's caps. if the cap is
1011 * old (didn't get renewed on the client reconnect), remove it now.
1012 *
1013 * caller must hold s_mutex.
1014 */
1015static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1016 void *arg)
1017{
1018 struct ceph_inode_info *ci = ceph_inode(inode);
1019
1020 wake_up_all(&ci->i_cap_wq);
1021 if (arg) {
1022 spin_lock(&ci->i_ceph_lock);
1023 ci->i_wanted_max_size = 0;
1024 ci->i_requested_max_size = 0;
1025 spin_unlock(&ci->i_ceph_lock);
1026 }
1027 return 0;
1028}
1029
1030static void wake_up_session_caps(struct ceph_mds_session *session,
1031 int reconnect)
1032{
1033 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1034 iterate_session_caps(session, wake_up_session_cb,
1035 (void *)(unsigned long)reconnect);
1036}
1037
1038/*
1039 * Send periodic message to MDS renewing all currently held caps. The
1040 * ack will reset the expiration for all caps from this session.
1041 *
1042 * caller holds s_mutex
1043 */
1044static int send_renew_caps(struct ceph_mds_client *mdsc,
1045 struct ceph_mds_session *session)
1046{
1047 struct ceph_msg *msg;
1048 int state;
1049
1050 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1051 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1052 pr_info("mds%d caps stale\n", session->s_mds);
1053 session->s_renew_requested = jiffies;
1054
1055 /* do not try to renew caps until a recovering mds has reconnected
1056 * with its clients. */
1057 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1058 if (state < CEPH_MDS_STATE_RECONNECT) {
1059 dout("send_renew_caps ignoring mds%d (%s)\n",
1060 session->s_mds, ceph_mds_state_name(state));
1061 return 0;
1062 }
1063
1064 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1065 ceph_mds_state_name(state));
1066 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1067 ++session->s_renew_seq);
1068 if (!msg)
1069 return -ENOMEM;
1070 ceph_con_send(&session->s_con, msg);
1071 return 0;
1072}
1073
1074/*
1075 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1076 *
1077 * Called under session->s_mutex
1078 */
1079static void renewed_caps(struct ceph_mds_client *mdsc,
1080 struct ceph_mds_session *session, int is_renew)
1081{
1082 int was_stale;
1083 int wake = 0;
1084
1085 spin_lock(&session->s_cap_lock);
1086 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1087
1088 session->s_cap_ttl = session->s_renew_requested +
1089 mdsc->mdsmap->m_session_timeout*HZ;
1090
1091 if (was_stale) {
1092 if (time_before(jiffies, session->s_cap_ttl)) {
1093 pr_info("mds%d caps renewed\n", session->s_mds);
1094 wake = 1;
1095 } else {
1096 pr_info("mds%d caps still stale\n", session->s_mds);
1097 }
1098 }
1099 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1100 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1101 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1102 spin_unlock(&session->s_cap_lock);
1103
1104 if (wake)
1105 wake_up_session_caps(session, 0);
1106}
1107
1108/*
1109 * send a session close request
1110 */
1111static int request_close_session(struct ceph_mds_client *mdsc,
1112 struct ceph_mds_session *session)
1113{
1114 struct ceph_msg *msg;
1115
1116 dout("request_close_session mds%d state %s seq %lld\n",
1117 session->s_mds, session_state_name(session->s_state),
1118 session->s_seq);
1119 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1120 if (!msg)
1121 return -ENOMEM;
1122 ceph_con_send(&session->s_con, msg);
1123 return 0;
1124}
1125
1126/*
1127 * Called with s_mutex held.
1128 */
1129static int __close_session(struct ceph_mds_client *mdsc,
1130 struct ceph_mds_session *session)
1131{
1132 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1133 return 0;
1134 session->s_state = CEPH_MDS_SESSION_CLOSING;
1135 return request_close_session(mdsc, session);
1136}
1137
1138/*
1139 * Trim old(er) caps.
1140 *
1141 * Because we can't cache an inode without one or more caps, we do
1142 * this indirectly: if a cap is unused, we prune its aliases, at which
1143 * point the inode will hopefully get dropped to.
1144 *
1145 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1146 * memory pressure from the MDS, though, so it needn't be perfect.
1147 */
1148static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1149{
1150 struct ceph_mds_session *session = arg;
1151 struct ceph_inode_info *ci = ceph_inode(inode);
1152 int used, oissued, mine;
1153
1154 if (session->s_trim_caps <= 0)
1155 return -1;
1156
1157 spin_lock(&ci->i_ceph_lock);
1158 mine = cap->issued | cap->implemented;
1159 used = __ceph_caps_used(ci);
1160 oissued = __ceph_caps_issued_other(ci, cap);
1161
1162 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
1163 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1164 ceph_cap_string(used));
1165 if (ci->i_dirty_caps)
1166 goto out; /* dirty caps */
1167 if ((used & ~oissued) & mine)
1168 goto out; /* we need these caps */
1169
1170 session->s_trim_caps--;
1171 if (oissued) {
1172 /* we aren't the only cap.. just remove us */
1173 __ceph_remove_cap(cap);
1174 } else {
1175 /* try to drop referring dentries */
1176 spin_unlock(&ci->i_ceph_lock);
1177 d_prune_aliases(inode);
1178 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1179 inode, cap, atomic_read(&inode->i_count));
1180 return 0;
1181 }
1182
1183out:
1184 spin_unlock(&ci->i_ceph_lock);
1185 return 0;
1186}
1187
1188/*
1189 * Trim session cap count down to some max number.
1190 */
1191static int trim_caps(struct ceph_mds_client *mdsc,
1192 struct ceph_mds_session *session,
1193 int max_caps)
1194{
1195 int trim_caps = session->s_nr_caps - max_caps;
1196
1197 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1198 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1199 if (trim_caps > 0) {
1200 session->s_trim_caps = trim_caps;
1201 iterate_session_caps(session, trim_caps_cb, session);
1202 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1203 session->s_mds, session->s_nr_caps, max_caps,
1204 trim_caps - session->s_trim_caps);
1205 session->s_trim_caps = 0;
1206 }
1207 return 0;
1208}
1209
1210/*
1211 * Allocate cap_release messages. If there is a partially full message
1212 * in the queue, try to allocate enough to cover it's remainder, so that
1213 * we can send it immediately.
1214 *
1215 * Called under s_mutex.
1216 */
1217int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
1218 struct ceph_mds_session *session)
1219{
1220 struct ceph_msg *msg, *partial = NULL;
1221 struct ceph_mds_cap_release *head;
1222 int err = -ENOMEM;
1223 int extra = mdsc->fsc->mount_options->cap_release_safety;
1224 int num;
1225
1226 dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
1227 extra);
1228
1229 spin_lock(&session->s_cap_lock);
1230
1231 if (!list_empty(&session->s_cap_releases)) {
1232 msg = list_first_entry(&session->s_cap_releases,
1233 struct ceph_msg,
1234 list_head);
1235 head = msg->front.iov_base;
1236 num = le32_to_cpu(head->num);
1237 if (num) {
1238 dout(" partial %p with (%d/%d)\n", msg, num,
1239 (int)CEPH_CAPS_PER_RELEASE);
1240 extra += CEPH_CAPS_PER_RELEASE - num;
1241 partial = msg;
1242 }
1243 }
1244 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1245 spin_unlock(&session->s_cap_lock);
1246 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
1247 GFP_NOFS, false);
1248 if (!msg)
1249 goto out_unlocked;
1250 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1251 (int)msg->front.iov_len);
1252 head = msg->front.iov_base;
1253 head->num = cpu_to_le32(0);
1254 msg->front.iov_len = sizeof(*head);
1255 spin_lock(&session->s_cap_lock);
1256 list_add(&msg->list_head, &session->s_cap_releases);
1257 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1258 }
1259
1260 if (partial) {
1261 head = partial->front.iov_base;
1262 num = le32_to_cpu(head->num);
1263 dout(" queueing partial %p with %d/%d\n", partial, num,
1264 (int)CEPH_CAPS_PER_RELEASE);
1265 list_move_tail(&partial->list_head,
1266 &session->s_cap_releases_done);
1267 session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
1268 }
1269 err = 0;
1270 spin_unlock(&session->s_cap_lock);
1271out_unlocked:
1272 return err;
1273}
1274
1275/*
1276 * flush all dirty inode data to disk.
1277 *
1278 * returns true if we've flushed through want_flush_seq
1279 */
1280static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
1281{
1282 int mds, ret = 1;
1283
1284 dout("check_cap_flush want %lld\n", want_flush_seq);
1285 mutex_lock(&mdsc->mutex);
1286 for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
1287 struct ceph_mds_session *session = mdsc->sessions[mds];
1288
1289 if (!session)
1290 continue;
1291 get_session(session);
1292 mutex_unlock(&mdsc->mutex);
1293
1294 mutex_lock(&session->s_mutex);
1295 if (!list_empty(&session->s_cap_flushing)) {
1296 struct ceph_inode_info *ci =
1297 list_entry(session->s_cap_flushing.next,
1298 struct ceph_inode_info,
1299 i_flushing_item);
1300 struct inode *inode = &ci->vfs_inode;
1301
1302 spin_lock(&ci->i_ceph_lock);
1303 if (ci->i_cap_flush_seq <= want_flush_seq) {
1304 dout("check_cap_flush still flushing %p "
1305 "seq %lld <= %lld to mds%d\n", inode,
1306 ci->i_cap_flush_seq, want_flush_seq,
1307 session->s_mds);
1308 ret = 0;
1309 }
1310 spin_unlock(&ci->i_ceph_lock);
1311 }
1312 mutex_unlock(&session->s_mutex);
1313 ceph_put_mds_session(session);
1314
1315 if (!ret)
1316 return ret;
1317 mutex_lock(&mdsc->mutex);
1318 }
1319
1320 mutex_unlock(&mdsc->mutex);
1321 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
1322 return ret;
1323}
1324
1325/*
1326 * called under s_mutex
1327 */
1328void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1329 struct ceph_mds_session *session)
1330{
1331 struct ceph_msg *msg;
1332
1333 dout("send_cap_releases mds%d\n", session->s_mds);
1334 spin_lock(&session->s_cap_lock);
1335 while (!list_empty(&session->s_cap_releases_done)) {
1336 msg = list_first_entry(&session->s_cap_releases_done,
1337 struct ceph_msg, list_head);
1338 list_del_init(&msg->list_head);
1339 spin_unlock(&session->s_cap_lock);
1340 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1341 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1342 ceph_con_send(&session->s_con, msg);
1343 spin_lock(&session->s_cap_lock);
1344 }
1345 spin_unlock(&session->s_cap_lock);
1346}
1347
1348static void discard_cap_releases(struct ceph_mds_client *mdsc,
1349 struct ceph_mds_session *session)
1350{
1351 struct ceph_msg *msg;
1352 struct ceph_mds_cap_release *head;
1353 unsigned num;
1354
1355 dout("discard_cap_releases mds%d\n", session->s_mds);
1356 spin_lock(&session->s_cap_lock);
1357
1358 /* zero out the in-progress message */
1359 msg = list_first_entry(&session->s_cap_releases,
1360 struct ceph_msg, list_head);
1361 head = msg->front.iov_base;
1362 num = le32_to_cpu(head->num);
1363 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num);
1364 head->num = cpu_to_le32(0);
1365 session->s_num_cap_releases += num;
1366
1367 /* requeue completed messages */
1368 while (!list_empty(&session->s_cap_releases_done)) {
1369 msg = list_first_entry(&session->s_cap_releases_done,
1370 struct ceph_msg, list_head);
1371 list_del_init(&msg->list_head);
1372
1373 head = msg->front.iov_base;
1374 num = le32_to_cpu(head->num);
1375 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
1376 num);
1377 session->s_num_cap_releases += num;
1378 head->num = cpu_to_le32(0);
1379 msg->front.iov_len = sizeof(*head);
1380 list_add(&msg->list_head, &session->s_cap_releases);
1381 }
1382
1383 spin_unlock(&session->s_cap_lock);
1384}
1385
1386/*
1387 * requests
1388 */
1389
1390/*
1391 * Create an mds request.
1392 */
1393struct ceph_mds_request *
1394ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1395{
1396 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1397
1398 if (!req)
1399 return ERR_PTR(-ENOMEM);
1400
1401 mutex_init(&req->r_fill_mutex);
1402 req->r_mdsc = mdsc;
1403 req->r_started = jiffies;
1404 req->r_resend_mds = -1;
1405 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1406 req->r_fmode = -1;
1407 kref_init(&req->r_kref);
1408 INIT_LIST_HEAD(&req->r_wait);
1409 init_completion(&req->r_completion);
1410 init_completion(&req->r_safe_completion);
1411 INIT_LIST_HEAD(&req->r_unsafe_item);
1412
1413 req->r_op = op;
1414 req->r_direct_mode = mode;
1415 return req;
1416}
1417
1418/*
1419 * return oldest (lowest) request, tid in request tree, 0 if none.
1420 *
1421 * called under mdsc->mutex.
1422 */
1423static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1424{
1425 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1426 return NULL;
1427 return rb_entry(rb_first(&mdsc->request_tree),
1428 struct ceph_mds_request, r_node);
1429}
1430
1431static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1432{
1433 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1434
1435 if (req)
1436 return req->r_tid;
1437 return 0;
1438}
1439
1440/*
1441 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1442 * on build_path_from_dentry in fs/cifs/dir.c.
1443 *
1444 * If @stop_on_nosnap, generate path relative to the first non-snapped
1445 * inode.
1446 *
1447 * Encode hidden .snap dirs as a double /, i.e.
1448 * foo/.snap/bar -> foo//bar
1449 */
1450char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1451 int stop_on_nosnap)
1452{
1453 struct dentry *temp;
1454 char *path;
1455 int len, pos;
1456 unsigned seq;
1457
1458 if (dentry == NULL)
1459 return ERR_PTR(-EINVAL);
1460
1461retry:
1462 len = 0;
1463 seq = read_seqbegin(&rename_lock);
1464 rcu_read_lock();
1465 for (temp = dentry; !IS_ROOT(temp);) {
1466 struct inode *inode = temp->d_inode;
1467 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1468 len++; /* slash only */
1469 else if (stop_on_nosnap && inode &&
1470 ceph_snap(inode) == CEPH_NOSNAP)
1471 break;
1472 else
1473 len += 1 + temp->d_name.len;
1474 temp = temp->d_parent;
1475 if (temp == NULL) {
1476 rcu_read_unlock();
1477 pr_err("build_path corrupt dentry %p\n", dentry);
1478 return ERR_PTR(-EINVAL);
1479 }
1480 }
1481 rcu_read_unlock();
1482 if (len)
1483 len--; /* no leading '/' */
1484
1485 path = kmalloc(len+1, GFP_NOFS);
1486 if (path == NULL)
1487 return ERR_PTR(-ENOMEM);
1488 pos = len;
1489 path[pos] = 0; /* trailing null */
1490 rcu_read_lock();
1491 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1492 struct inode *inode;
1493
1494 spin_lock(&temp->d_lock);
1495 inode = temp->d_inode;
1496 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1497 dout("build_path path+%d: %p SNAPDIR\n",
1498 pos, temp);
1499 } else if (stop_on_nosnap && inode &&
1500 ceph_snap(inode) == CEPH_NOSNAP) {
1501 spin_unlock(&temp->d_lock);
1502 break;
1503 } else {
1504 pos -= temp->d_name.len;
1505 if (pos < 0) {
1506 spin_unlock(&temp->d_lock);
1507 break;
1508 }
1509 strncpy(path + pos, temp->d_name.name,
1510 temp->d_name.len);
1511 }
1512 spin_unlock(&temp->d_lock);
1513 if (pos)
1514 path[--pos] = '/';
1515 temp = temp->d_parent;
1516 if (temp == NULL) {
1517 rcu_read_unlock();
1518 pr_err("build_path corrupt dentry\n");
1519 kfree(path);
1520 return ERR_PTR(-EINVAL);
1521 }
1522 }
1523 rcu_read_unlock();
1524 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1525 pr_err("build_path did not end path lookup where "
1526 "expected, namelen is %d, pos is %d\n", len, pos);
1527 /* presumably this is only possible if racing with a
1528 rename of one of the parent directories (we can not
1529 lock the dentries above us to prevent this, but
1530 retrying should be harmless) */
1531 kfree(path);
1532 goto retry;
1533 }
1534
1535 *base = ceph_ino(temp->d_inode);
1536 *plen = len;
1537 dout("build_path on %p %d built %llx '%.*s'\n",
1538 dentry, dentry->d_count, *base, len, path);
1539 return path;
1540}
1541
1542static int build_dentry_path(struct dentry *dentry,
1543 const char **ppath, int *ppathlen, u64 *pino,
1544 int *pfreepath)
1545{
1546 char *path;
1547
1548 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1549 *pino = ceph_ino(dentry->d_parent->d_inode);
1550 *ppath = dentry->d_name.name;
1551 *ppathlen = dentry->d_name.len;
1552 return 0;
1553 }
1554 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1555 if (IS_ERR(path))
1556 return PTR_ERR(path);
1557 *ppath = path;
1558 *pfreepath = 1;
1559 return 0;
1560}
1561
1562static int build_inode_path(struct inode *inode,
1563 const char **ppath, int *ppathlen, u64 *pino,
1564 int *pfreepath)
1565{
1566 struct dentry *dentry;
1567 char *path;
1568
1569 if (ceph_snap(inode) == CEPH_NOSNAP) {
1570 *pino = ceph_ino(inode);
1571 *ppathlen = 0;
1572 return 0;
1573 }
1574 dentry = d_find_alias(inode);
1575 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1576 dput(dentry);
1577 if (IS_ERR(path))
1578 return PTR_ERR(path);
1579 *ppath = path;
1580 *pfreepath = 1;
1581 return 0;
1582}
1583
1584/*
1585 * request arguments may be specified via an inode *, a dentry *, or
1586 * an explicit ino+path.
1587 */
1588static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1589 const char *rpath, u64 rino,
1590 const char **ppath, int *pathlen,
1591 u64 *ino, int *freepath)
1592{
1593 int r = 0;
1594
1595 if (rinode) {
1596 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1597 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1598 ceph_snap(rinode));
1599 } else if (rdentry) {
1600 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1601 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1602 *ppath);
1603 } else if (rpath || rino) {
1604 *ino = rino;
1605 *ppath = rpath;
1606 *pathlen = strlen(rpath);
1607 dout(" path %.*s\n", *pathlen, rpath);
1608 }
1609
1610 return r;
1611}
1612
1613/*
1614 * called under mdsc->mutex
1615 */
1616static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1617 struct ceph_mds_request *req,
1618 int mds)
1619{
1620 struct ceph_msg *msg;
1621 struct ceph_mds_request_head *head;
1622 const char *path1 = NULL;
1623 const char *path2 = NULL;
1624 u64 ino1 = 0, ino2 = 0;
1625 int pathlen1 = 0, pathlen2 = 0;
1626 int freepath1 = 0, freepath2 = 0;
1627 int len;
1628 u16 releases;
1629 void *p, *end;
1630 int ret;
1631
1632 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1633 req->r_path1, req->r_ino1.ino,
1634 &path1, &pathlen1, &ino1, &freepath1);
1635 if (ret < 0) {
1636 msg = ERR_PTR(ret);
1637 goto out;
1638 }
1639
1640 ret = set_request_path_attr(NULL, req->r_old_dentry,
1641 req->r_path2, req->r_ino2.ino,
1642 &path2, &pathlen2, &ino2, &freepath2);
1643 if (ret < 0) {
1644 msg = ERR_PTR(ret);
1645 goto out_free1;
1646 }
1647
1648 len = sizeof(*head) +
1649 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
1650
1651 /* calculate (max) length for cap releases */
1652 len += sizeof(struct ceph_mds_request_release) *
1653 (!!req->r_inode_drop + !!req->r_dentry_drop +
1654 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1655 if (req->r_dentry_drop)
1656 len += req->r_dentry->d_name.len;
1657 if (req->r_old_dentry_drop)
1658 len += req->r_old_dentry->d_name.len;
1659
1660 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1661 if (!msg) {
1662 msg = ERR_PTR(-ENOMEM);
1663 goto out_free2;
1664 }
1665
1666 msg->hdr.tid = cpu_to_le64(req->r_tid);
1667
1668 head = msg->front.iov_base;
1669 p = msg->front.iov_base + sizeof(*head);
1670 end = msg->front.iov_base + msg->front.iov_len;
1671
1672 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1673 head->op = cpu_to_le32(req->r_op);
1674 head->caller_uid = cpu_to_le32(req->r_uid);
1675 head->caller_gid = cpu_to_le32(req->r_gid);
1676 head->args = req->r_args;
1677
1678 ceph_encode_filepath(&p, end, ino1, path1);
1679 ceph_encode_filepath(&p, end, ino2, path2);
1680
1681 /* make note of release offset, in case we need to replay */
1682 req->r_request_release_offset = p - msg->front.iov_base;
1683
1684 /* cap releases */
1685 releases = 0;
1686 if (req->r_inode_drop)
1687 releases += ceph_encode_inode_release(&p,
1688 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1689 mds, req->r_inode_drop, req->r_inode_unless, 0);
1690 if (req->r_dentry_drop)
1691 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1692 mds, req->r_dentry_drop, req->r_dentry_unless);
1693 if (req->r_old_dentry_drop)
1694 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1695 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1696 if (req->r_old_inode_drop)
1697 releases += ceph_encode_inode_release(&p,
1698 req->r_old_dentry->d_inode,
1699 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1700 head->num_releases = cpu_to_le16(releases);
1701
1702 BUG_ON(p > end);
1703 msg->front.iov_len = p - msg->front.iov_base;
1704 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1705
1706 msg->pages = req->r_pages;
1707 msg->nr_pages = req->r_num_pages;
1708 msg->hdr.data_len = cpu_to_le32(req->r_data_len);
1709 msg->hdr.data_off = cpu_to_le16(0);
1710
1711out_free2:
1712 if (freepath2)
1713 kfree((char *)path2);
1714out_free1:
1715 if (freepath1)
1716 kfree((char *)path1);
1717out:
1718 return msg;
1719}
1720
1721/*
1722 * called under mdsc->mutex if error, under no mutex if
1723 * success.
1724 */
1725static void complete_request(struct ceph_mds_client *mdsc,
1726 struct ceph_mds_request *req)
1727{
1728 if (req->r_callback)
1729 req->r_callback(mdsc, req);
1730 else
1731 complete_all(&req->r_completion);
1732}
1733
1734/*
1735 * called under mdsc->mutex
1736 */
1737static int __prepare_send_request(struct ceph_mds_client *mdsc,
1738 struct ceph_mds_request *req,
1739 int mds)
1740{
1741 struct ceph_mds_request_head *rhead;
1742 struct ceph_msg *msg;
1743 int flags = 0;
1744
1745 req->r_attempts++;
1746 if (req->r_inode) {
1747 struct ceph_cap *cap =
1748 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
1749
1750 if (cap)
1751 req->r_sent_on_mseq = cap->mseq;
1752 else
1753 req->r_sent_on_mseq = -1;
1754 }
1755 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
1756 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
1757
1758 if (req->r_got_unsafe) {
1759 /*
1760 * Replay. Do not regenerate message (and rebuild
1761 * paths, etc.); just use the original message.
1762 * Rebuilding paths will break for renames because
1763 * d_move mangles the src name.
1764 */
1765 msg = req->r_request;
1766 rhead = msg->front.iov_base;
1767
1768 flags = le32_to_cpu(rhead->flags);
1769 flags |= CEPH_MDS_FLAG_REPLAY;
1770 rhead->flags = cpu_to_le32(flags);
1771
1772 if (req->r_target_inode)
1773 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
1774
1775 rhead->num_retry = req->r_attempts - 1;
1776
1777 /* remove cap/dentry releases from message */
1778 rhead->num_releases = 0;
1779 msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset);
1780 msg->front.iov_len = req->r_request_release_offset;
1781 return 0;
1782 }
1783
1784 if (req->r_request) {
1785 ceph_msg_put(req->r_request);
1786 req->r_request = NULL;
1787 }
1788 msg = create_request_message(mdsc, req, mds);
1789 if (IS_ERR(msg)) {
1790 req->r_err = PTR_ERR(msg);
1791 complete_request(mdsc, req);
1792 return PTR_ERR(msg);
1793 }
1794 req->r_request = msg;
1795
1796 rhead = msg->front.iov_base;
1797 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
1798 if (req->r_got_unsafe)
1799 flags |= CEPH_MDS_FLAG_REPLAY;
1800 if (req->r_locked_dir)
1801 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
1802 rhead->flags = cpu_to_le32(flags);
1803 rhead->num_fwd = req->r_num_fwd;
1804 rhead->num_retry = req->r_attempts - 1;
1805 rhead->ino = 0;
1806
1807 dout(" r_locked_dir = %p\n", req->r_locked_dir);
1808 return 0;
1809}
1810
1811/*
1812 * send request, or put it on the appropriate wait list.
1813 */
1814static int __do_request(struct ceph_mds_client *mdsc,
1815 struct ceph_mds_request *req)
1816{
1817 struct ceph_mds_session *session = NULL;
1818 int mds = -1;
1819 int err = -EAGAIN;
1820
1821 if (req->r_err || req->r_got_result)
1822 goto out;
1823
1824 if (req->r_timeout &&
1825 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
1826 dout("do_request timed out\n");
1827 err = -EIO;
1828 goto finish;
1829 }
1830
1831 put_request_session(req);
1832
1833 mds = __choose_mds(mdsc, req);
1834 if (mds < 0 ||
1835 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
1836 dout("do_request no mds or not active, waiting for map\n");
1837 list_add(&req->r_wait, &mdsc->waiting_for_map);
1838 goto out;
1839 }
1840
1841 /* get, open session */
1842 session = __ceph_lookup_mds_session(mdsc, mds);
1843 if (!session) {
1844 session = register_session(mdsc, mds);
1845 if (IS_ERR(session)) {
1846 err = PTR_ERR(session);
1847 goto finish;
1848 }
1849 }
1850 req->r_session = get_session(session);
1851
1852 dout("do_request mds%d session %p state %s\n", mds, session,
1853 session_state_name(session->s_state));
1854 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
1855 session->s_state != CEPH_MDS_SESSION_HUNG) {
1856 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1857 session->s_state == CEPH_MDS_SESSION_CLOSING)
1858 __open_session(mdsc, session);
1859 list_add(&req->r_wait, &session->s_waiting);
1860 goto out_session;
1861 }
1862
1863 /* send request */
1864 req->r_resend_mds = -1; /* forget any previous mds hint */
1865
1866 if (req->r_request_started == 0) /* note request start time */
1867 req->r_request_started = jiffies;
1868
1869 err = __prepare_send_request(mdsc, req, mds);
1870 if (!err) {
1871 ceph_msg_get(req->r_request);
1872 ceph_con_send(&session->s_con, req->r_request);
1873 }
1874
1875out_session:
1876 ceph_put_mds_session(session);
1877out:
1878 return err;
1879
1880finish:
1881 req->r_err = err;
1882 complete_request(mdsc, req);
1883 goto out;
1884}
1885
1886/*
1887 * called under mdsc->mutex
1888 */
1889static void __wake_requests(struct ceph_mds_client *mdsc,
1890 struct list_head *head)
1891{
1892 struct ceph_mds_request *req, *nreq;
1893
1894 list_for_each_entry_safe(req, nreq, head, r_wait) {
1895 list_del_init(&req->r_wait);
1896 __do_request(mdsc, req);
1897 }
1898}
1899
1900/*
1901 * Wake up threads with requests pending for @mds, so that they can
1902 * resubmit their requests to a possibly different mds.
1903 */
1904static void kick_requests(struct ceph_mds_client *mdsc, int mds)
1905{
1906 struct ceph_mds_request *req;
1907 struct rb_node *p;
1908
1909 dout("kick_requests mds%d\n", mds);
1910 for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
1911 req = rb_entry(p, struct ceph_mds_request, r_node);
1912 if (req->r_got_unsafe)
1913 continue;
1914 if (req->r_session &&
1915 req->r_session->s_mds == mds) {
1916 dout(" kicking tid %llu\n", req->r_tid);
1917 __do_request(mdsc, req);
1918 }
1919 }
1920}
1921
1922void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
1923 struct ceph_mds_request *req)
1924{
1925 dout("submit_request on %p\n", req);
1926 mutex_lock(&mdsc->mutex);
1927 __register_request(mdsc, req, NULL);
1928 __do_request(mdsc, req);
1929 mutex_unlock(&mdsc->mutex);
1930}
1931
1932/*
1933 * Synchrously perform an mds request. Take care of all of the
1934 * session setup, forwarding, retry details.
1935 */
1936int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
1937 struct inode *dir,
1938 struct ceph_mds_request *req)
1939{
1940 int err;
1941
1942 dout("do_request on %p\n", req);
1943
1944 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
1945 if (req->r_inode)
1946 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
1947 if (req->r_locked_dir)
1948 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
1949 if (req->r_old_dentry)
1950 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
1951 CEPH_CAP_PIN);
1952
1953 /* issue */
1954 mutex_lock(&mdsc->mutex);
1955 __register_request(mdsc, req, dir);
1956 __do_request(mdsc, req);
1957
1958 if (req->r_err) {
1959 err = req->r_err;
1960 __unregister_request(mdsc, req);
1961 dout("do_request early error %d\n", err);
1962 goto out;
1963 }
1964
1965 /* wait */
1966 mutex_unlock(&mdsc->mutex);
1967 dout("do_request waiting\n");
1968 if (req->r_timeout) {
1969 err = (long)wait_for_completion_killable_timeout(
1970 &req->r_completion, req->r_timeout);
1971 if (err == 0)
1972 err = -EIO;
1973 } else {
1974 err = wait_for_completion_killable(&req->r_completion);
1975 }
1976 dout("do_request waited, got %d\n", err);
1977 mutex_lock(&mdsc->mutex);
1978
1979 /* only abort if we didn't race with a real reply */
1980 if (req->r_got_result) {
1981 err = le32_to_cpu(req->r_reply_info.head->result);
1982 } else if (err < 0) {
1983 dout("aborted request %lld with %d\n", req->r_tid, err);
1984
1985 /*
1986 * ensure we aren't running concurrently with
1987 * ceph_fill_trace or ceph_readdir_prepopulate, which
1988 * rely on locks (dir mutex) held by our caller.
1989 */
1990 mutex_lock(&req->r_fill_mutex);
1991 req->r_err = err;
1992 req->r_aborted = true;
1993 mutex_unlock(&req->r_fill_mutex);
1994
1995 if (req->r_locked_dir &&
1996 (req->r_op & CEPH_MDS_OP_WRITE))
1997 ceph_invalidate_dir_request(req);
1998 } else {
1999 err = req->r_err;
2000 }
2001
2002out:
2003 mutex_unlock(&mdsc->mutex);
2004 dout("do_request %p done, result %d\n", req, err);
2005 return err;
2006}
2007
2008/*
2009 * Invalidate dir D_COMPLETE, dentry lease state on an aborted MDS
2010 * namespace request.
2011 */
2012void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2013{
2014 struct inode *inode = req->r_locked_dir;
2015 struct ceph_inode_info *ci = ceph_inode(inode);
2016
2017 dout("invalidate_dir_request %p (D_COMPLETE, lease(s))\n", inode);
2018 spin_lock(&ci->i_ceph_lock);
2019 ceph_dir_clear_complete(inode);
2020 ci->i_release_count++;
2021 spin_unlock(&ci->i_ceph_lock);
2022
2023 if (req->r_dentry)
2024 ceph_invalidate_dentry_lease(req->r_dentry);
2025 if (req->r_old_dentry)
2026 ceph_invalidate_dentry_lease(req->r_old_dentry);
2027}
2028
2029/*
2030 * Handle mds reply.
2031 *
2032 * We take the session mutex and parse and process the reply immediately.
2033 * This preserves the logical ordering of replies, capabilities, etc., sent
2034 * by the MDS as they are applied to our local cache.
2035 */
2036static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2037{
2038 struct ceph_mds_client *mdsc = session->s_mdsc;
2039 struct ceph_mds_request *req;
2040 struct ceph_mds_reply_head *head = msg->front.iov_base;
2041 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2042 u64 tid;
2043 int err, result;
2044 int mds = session->s_mds;
2045
2046 if (msg->front.iov_len < sizeof(*head)) {
2047 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2048 ceph_msg_dump(msg);
2049 return;
2050 }
2051
2052 /* get request, session */
2053 tid = le64_to_cpu(msg->hdr.tid);
2054 mutex_lock(&mdsc->mutex);
2055 req = __lookup_request(mdsc, tid);
2056 if (!req) {
2057 dout("handle_reply on unknown tid %llu\n", tid);
2058 mutex_unlock(&mdsc->mutex);
2059 return;
2060 }
2061 dout("handle_reply %p\n", req);
2062
2063 /* correct session? */
2064 if (req->r_session != session) {
2065 pr_err("mdsc_handle_reply got %llu on session mds%d"
2066 " not mds%d\n", tid, session->s_mds,
2067 req->r_session ? req->r_session->s_mds : -1);
2068 mutex_unlock(&mdsc->mutex);
2069 goto out;
2070 }
2071
2072 /* dup? */
2073 if ((req->r_got_unsafe && !head->safe) ||
2074 (req->r_got_safe && head->safe)) {
2075 pr_warning("got a dup %s reply on %llu from mds%d\n",
2076 head->safe ? "safe" : "unsafe", tid, mds);
2077 mutex_unlock(&mdsc->mutex);
2078 goto out;
2079 }
2080 if (req->r_got_safe && !head->safe) {
2081 pr_warning("got unsafe after safe on %llu from mds%d\n",
2082 tid, mds);
2083 mutex_unlock(&mdsc->mutex);
2084 goto out;
2085 }
2086
2087 result = le32_to_cpu(head->result);
2088
2089 /*
2090 * Handle an ESTALE
2091 * if we're not talking to the authority, send to them
2092 * if the authority has changed while we weren't looking,
2093 * send to new authority
2094 * Otherwise we just have to return an ESTALE
2095 */
2096 if (result == -ESTALE) {
2097 dout("got ESTALE on request %llu", req->r_tid);
2098 if (!req->r_inode) {
2099 /* do nothing; not an authority problem */
2100 } else if (req->r_direct_mode != USE_AUTH_MDS) {
2101 dout("not using auth, setting for that now");
2102 req->r_direct_mode = USE_AUTH_MDS;
2103 __do_request(mdsc, req);
2104 mutex_unlock(&mdsc->mutex);
2105 goto out;
2106 } else {
2107 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
2108 struct ceph_cap *cap = NULL;
2109
2110 if (req->r_session)
2111 cap = ceph_get_cap_for_mds(ci,
2112 req->r_session->s_mds);
2113
2114 dout("already using auth");
2115 if ((!cap || cap != ci->i_auth_cap) ||
2116 (cap->mseq != req->r_sent_on_mseq)) {
2117 dout("but cap changed, so resending");
2118 __do_request(mdsc, req);
2119 mutex_unlock(&mdsc->mutex);
2120 goto out;
2121 }
2122 }
2123 dout("have to return ESTALE on request %llu", req->r_tid);
2124 }
2125
2126
2127 if (head->safe) {
2128 req->r_got_safe = true;
2129 __unregister_request(mdsc, req);
2130 complete_all(&req->r_safe_completion);
2131
2132 if (req->r_got_unsafe) {
2133 /*
2134 * We already handled the unsafe response, now do the
2135 * cleanup. No need to examine the response; the MDS
2136 * doesn't include any result info in the safe
2137 * response. And even if it did, there is nothing
2138 * useful we could do with a revised return value.
2139 */
2140 dout("got safe reply %llu, mds%d\n", tid, mds);
2141 list_del_init(&req->r_unsafe_item);
2142
2143 /* last unsafe request during umount? */
2144 if (mdsc->stopping && !__get_oldest_req(mdsc))
2145 complete_all(&mdsc->safe_umount_waiters);
2146 mutex_unlock(&mdsc->mutex);
2147 goto out;
2148 }
2149 } else {
2150 req->r_got_unsafe = true;
2151 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2152 }
2153
2154 dout("handle_reply tid %lld result %d\n", tid, result);
2155 rinfo = &req->r_reply_info;
2156 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2157 mutex_unlock(&mdsc->mutex);
2158
2159 mutex_lock(&session->s_mutex);
2160 if (err < 0) {
2161 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2162 ceph_msg_dump(msg);
2163 goto out_err;
2164 }
2165
2166 /* snap trace */
2167 if (rinfo->snapblob_len) {
2168 down_write(&mdsc->snap_rwsem);
2169 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2170 rinfo->snapblob + rinfo->snapblob_len,
2171 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
2172 downgrade_write(&mdsc->snap_rwsem);
2173 } else {
2174 down_read(&mdsc->snap_rwsem);
2175 }
2176
2177 /* insert trace into our cache */
2178 mutex_lock(&req->r_fill_mutex);
2179 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2180 if (err == 0) {
2181 if (result == 0 && req->r_op != CEPH_MDS_OP_GETFILELOCK &&
2182 rinfo->dir_nr)
2183 ceph_readdir_prepopulate(req, req->r_session);
2184 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2185 }
2186 mutex_unlock(&req->r_fill_mutex);
2187
2188 up_read(&mdsc->snap_rwsem);
2189out_err:
2190 mutex_lock(&mdsc->mutex);
2191 if (!req->r_aborted) {
2192 if (err) {
2193 req->r_err = err;
2194 } else {
2195 req->r_reply = msg;
2196 ceph_msg_get(msg);
2197 req->r_got_result = true;
2198 }
2199 } else {
2200 dout("reply arrived after request %lld was aborted\n", tid);
2201 }
2202 mutex_unlock(&mdsc->mutex);
2203
2204 ceph_add_cap_releases(mdsc, req->r_session);
2205 mutex_unlock(&session->s_mutex);
2206
2207 /* kick calling process */
2208 complete_request(mdsc, req);
2209out:
2210 ceph_mdsc_put_request(req);
2211 return;
2212}
2213
2214
2215
2216/*
2217 * handle mds notification that our request has been forwarded.
2218 */
2219static void handle_forward(struct ceph_mds_client *mdsc,
2220 struct ceph_mds_session *session,
2221 struct ceph_msg *msg)
2222{
2223 struct ceph_mds_request *req;
2224 u64 tid = le64_to_cpu(msg->hdr.tid);
2225 u32 next_mds;
2226 u32 fwd_seq;
2227 int err = -EINVAL;
2228 void *p = msg->front.iov_base;
2229 void *end = p + msg->front.iov_len;
2230
2231 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2232 next_mds = ceph_decode_32(&p);
2233 fwd_seq = ceph_decode_32(&p);
2234
2235 mutex_lock(&mdsc->mutex);
2236 req = __lookup_request(mdsc, tid);
2237 if (!req) {
2238 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2239 goto out; /* dup reply? */
2240 }
2241
2242 if (req->r_aborted) {
2243 dout("forward tid %llu aborted, unregistering\n", tid);
2244 __unregister_request(mdsc, req);
2245 } else if (fwd_seq <= req->r_num_fwd) {
2246 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2247 tid, next_mds, req->r_num_fwd, fwd_seq);
2248 } else {
2249 /* resend. forward race not possible; mds would drop */
2250 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2251 BUG_ON(req->r_err);
2252 BUG_ON(req->r_got_result);
2253 req->r_num_fwd = fwd_seq;
2254 req->r_resend_mds = next_mds;
2255 put_request_session(req);
2256 __do_request(mdsc, req);
2257 }
2258 ceph_mdsc_put_request(req);
2259out:
2260 mutex_unlock(&mdsc->mutex);
2261 return;
2262
2263bad:
2264 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2265}
2266
2267/*
2268 * handle a mds session control message
2269 */
2270static void handle_session(struct ceph_mds_session *session,
2271 struct ceph_msg *msg)
2272{
2273 struct ceph_mds_client *mdsc = session->s_mdsc;
2274 u32 op;
2275 u64 seq;
2276 int mds = session->s_mds;
2277 struct ceph_mds_session_head *h = msg->front.iov_base;
2278 int wake = 0;
2279
2280 /* decode */
2281 if (msg->front.iov_len != sizeof(*h))
2282 goto bad;
2283 op = le32_to_cpu(h->op);
2284 seq = le64_to_cpu(h->seq);
2285
2286 mutex_lock(&mdsc->mutex);
2287 if (op == CEPH_SESSION_CLOSE)
2288 __unregister_session(mdsc, session);
2289 /* FIXME: this ttl calculation is generous */
2290 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2291 mutex_unlock(&mdsc->mutex);
2292
2293 mutex_lock(&session->s_mutex);
2294
2295 dout("handle_session mds%d %s %p state %s seq %llu\n",
2296 mds, ceph_session_op_name(op), session,
2297 session_state_name(session->s_state), seq);
2298
2299 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2300 session->s_state = CEPH_MDS_SESSION_OPEN;
2301 pr_info("mds%d came back\n", session->s_mds);
2302 }
2303
2304 switch (op) {
2305 case CEPH_SESSION_OPEN:
2306 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2307 pr_info("mds%d reconnect success\n", session->s_mds);
2308 session->s_state = CEPH_MDS_SESSION_OPEN;
2309 renewed_caps(mdsc, session, 0);
2310 wake = 1;
2311 if (mdsc->stopping)
2312 __close_session(mdsc, session);
2313 break;
2314
2315 case CEPH_SESSION_RENEWCAPS:
2316 if (session->s_renew_seq == seq)
2317 renewed_caps(mdsc, session, 1);
2318 break;
2319
2320 case CEPH_SESSION_CLOSE:
2321 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2322 pr_info("mds%d reconnect denied\n", session->s_mds);
2323 remove_session_caps(session);
2324 wake = 1; /* for good measure */
2325 wake_up_all(&mdsc->session_close_wq);
2326 kick_requests(mdsc, mds);
2327 break;
2328
2329 case CEPH_SESSION_STALE:
2330 pr_info("mds%d caps went stale, renewing\n",
2331 session->s_mds);
2332 spin_lock(&session->s_gen_ttl_lock);
2333 session->s_cap_gen++;
2334 session->s_cap_ttl = jiffies - 1;
2335 spin_unlock(&session->s_gen_ttl_lock);
2336 send_renew_caps(mdsc, session);
2337 break;
2338
2339 case CEPH_SESSION_RECALL_STATE:
2340 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2341 break;
2342
2343 default:
2344 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2345 WARN_ON(1);
2346 }
2347
2348 mutex_unlock(&session->s_mutex);
2349 if (wake) {
2350 mutex_lock(&mdsc->mutex);
2351 __wake_requests(mdsc, &session->s_waiting);
2352 mutex_unlock(&mdsc->mutex);
2353 }
2354 return;
2355
2356bad:
2357 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2358 (int)msg->front.iov_len);
2359 ceph_msg_dump(msg);
2360 return;
2361}
2362
2363
2364/*
2365 * called under session->mutex.
2366 */
2367static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2368 struct ceph_mds_session *session)
2369{
2370 struct ceph_mds_request *req, *nreq;
2371 int err;
2372
2373 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2374
2375 mutex_lock(&mdsc->mutex);
2376 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2377 err = __prepare_send_request(mdsc, req, session->s_mds);
2378 if (!err) {
2379 ceph_msg_get(req->r_request);
2380 ceph_con_send(&session->s_con, req->r_request);
2381 }
2382 }
2383 mutex_unlock(&mdsc->mutex);
2384}
2385
2386/*
2387 * Encode information about a cap for a reconnect with the MDS.
2388 */
2389static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2390 void *arg)
2391{
2392 union {
2393 struct ceph_mds_cap_reconnect v2;
2394 struct ceph_mds_cap_reconnect_v1 v1;
2395 } rec;
2396 size_t reclen;
2397 struct ceph_inode_info *ci;
2398 struct ceph_reconnect_state *recon_state = arg;
2399 struct ceph_pagelist *pagelist = recon_state->pagelist;
2400 char *path;
2401 int pathlen, err;
2402 u64 pathbase;
2403 struct dentry *dentry;
2404
2405 ci = cap->ci;
2406
2407 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2408 inode, ceph_vinop(inode), cap, cap->cap_id,
2409 ceph_cap_string(cap->issued));
2410 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2411 if (err)
2412 return err;
2413
2414 dentry = d_find_alias(inode);
2415 if (dentry) {
2416 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2417 if (IS_ERR(path)) {
2418 err = PTR_ERR(path);
2419 goto out_dput;
2420 }
2421 } else {
2422 path = NULL;
2423 pathlen = 0;
2424 }
2425 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2426 if (err)
2427 goto out_free;
2428
2429 spin_lock(&ci->i_ceph_lock);
2430 cap->seq = 0; /* reset cap seq */
2431 cap->issue_seq = 0; /* and issue_seq */
2432
2433 if (recon_state->flock) {
2434 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2435 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2436 rec.v2.issued = cpu_to_le32(cap->issued);
2437 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2438 rec.v2.pathbase = cpu_to_le64(pathbase);
2439 rec.v2.flock_len = 0;
2440 reclen = sizeof(rec.v2);
2441 } else {
2442 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2443 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2444 rec.v1.issued = cpu_to_le32(cap->issued);
2445 rec.v1.size = cpu_to_le64(inode->i_size);
2446 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2447 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2448 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2449 rec.v1.pathbase = cpu_to_le64(pathbase);
2450 reclen = sizeof(rec.v1);
2451 }
2452 spin_unlock(&ci->i_ceph_lock);
2453
2454 if (recon_state->flock) {
2455 int num_fcntl_locks, num_flock_locks;
2456 struct ceph_pagelist_cursor trunc_point;
2457
2458 ceph_pagelist_set_cursor(pagelist, &trunc_point);
2459 do {
2460 lock_flocks();
2461 ceph_count_locks(inode, &num_fcntl_locks,
2462 &num_flock_locks);
2463 rec.v2.flock_len = (2*sizeof(u32) +
2464 (num_fcntl_locks+num_flock_locks) *
2465 sizeof(struct ceph_filelock));
2466 unlock_flocks();
2467
2468 /* pre-alloc pagelist */
2469 ceph_pagelist_truncate(pagelist, &trunc_point);
2470 err = ceph_pagelist_append(pagelist, &rec, reclen);
2471 if (!err)
2472 err = ceph_pagelist_reserve(pagelist,
2473 rec.v2.flock_len);
2474
2475 /* encode locks */
2476 if (!err) {
2477 lock_flocks();
2478 err = ceph_encode_locks(inode,
2479 pagelist,
2480 num_fcntl_locks,
2481 num_flock_locks);
2482 unlock_flocks();
2483 }
2484 } while (err == -ENOSPC);
2485 } else {
2486 err = ceph_pagelist_append(pagelist, &rec, reclen);
2487 }
2488
2489out_free:
2490 kfree(path);
2491out_dput:
2492 dput(dentry);
2493 return err;
2494}
2495
2496
2497/*
2498 * If an MDS fails and recovers, clients need to reconnect in order to
2499 * reestablish shared state. This includes all caps issued through
2500 * this session _and_ the snap_realm hierarchy. Because it's not
2501 * clear which snap realms the mds cares about, we send everything we
2502 * know about.. that ensures we'll then get any new info the
2503 * recovering MDS might have.
2504 *
2505 * This is a relatively heavyweight operation, but it's rare.
2506 *
2507 * called with mdsc->mutex held.
2508 */
2509static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2510 struct ceph_mds_session *session)
2511{
2512 struct ceph_msg *reply;
2513 struct rb_node *p;
2514 int mds = session->s_mds;
2515 int err = -ENOMEM;
2516 struct ceph_pagelist *pagelist;
2517 struct ceph_reconnect_state recon_state;
2518
2519 pr_info("mds%d reconnect start\n", mds);
2520
2521 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2522 if (!pagelist)
2523 goto fail_nopagelist;
2524 ceph_pagelist_init(pagelist);
2525
2526 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
2527 if (!reply)
2528 goto fail_nomsg;
2529
2530 mutex_lock(&session->s_mutex);
2531 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2532 session->s_seq = 0;
2533
2534 ceph_con_open(&session->s_con,
2535 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2536
2537 /* replay unsafe requests */
2538 replay_unsafe_requests(mdsc, session);
2539
2540 down_read(&mdsc->snap_rwsem);
2541
2542 dout("session %p state %s\n", session,
2543 session_state_name(session->s_state));
2544
2545 /* drop old cap expires; we're about to reestablish that state */
2546 discard_cap_releases(mdsc, session);
2547
2548 /* traverse this session's caps */
2549 err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps);
2550 if (err)
2551 goto fail;
2552
2553 recon_state.pagelist = pagelist;
2554 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2555 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2556 if (err < 0)
2557 goto fail;
2558
2559 /*
2560 * snaprealms. we provide mds with the ino, seq (version), and
2561 * parent for all of our realms. If the mds has any newer info,
2562 * it will tell us.
2563 */
2564 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2565 struct ceph_snap_realm *realm =
2566 rb_entry(p, struct ceph_snap_realm, node);
2567 struct ceph_mds_snaprealm_reconnect sr_rec;
2568
2569 dout(" adding snap realm %llx seq %lld parent %llx\n",
2570 realm->ino, realm->seq, realm->parent_ino);
2571 sr_rec.ino = cpu_to_le64(realm->ino);
2572 sr_rec.seq = cpu_to_le64(realm->seq);
2573 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2574 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2575 if (err)
2576 goto fail;
2577 }
2578
2579 reply->pagelist = pagelist;
2580 if (recon_state.flock)
2581 reply->hdr.version = cpu_to_le16(2);
2582 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2583 reply->nr_pages = calc_pages_for(0, pagelist->length);
2584 ceph_con_send(&session->s_con, reply);
2585
2586 mutex_unlock(&session->s_mutex);
2587
2588 mutex_lock(&mdsc->mutex);
2589 __wake_requests(mdsc, &session->s_waiting);
2590 mutex_unlock(&mdsc->mutex);
2591
2592 up_read(&mdsc->snap_rwsem);
2593 return;
2594
2595fail:
2596 ceph_msg_put(reply);
2597 up_read(&mdsc->snap_rwsem);
2598 mutex_unlock(&session->s_mutex);
2599fail_nomsg:
2600 ceph_pagelist_release(pagelist);
2601 kfree(pagelist);
2602fail_nopagelist:
2603 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
2604 return;
2605}
2606
2607
2608/*
2609 * compare old and new mdsmaps, kicking requests
2610 * and closing out old connections as necessary
2611 *
2612 * called under mdsc->mutex.
2613 */
2614static void check_new_map(struct ceph_mds_client *mdsc,
2615 struct ceph_mdsmap *newmap,
2616 struct ceph_mdsmap *oldmap)
2617{
2618 int i;
2619 int oldstate, newstate;
2620 struct ceph_mds_session *s;
2621
2622 dout("check_new_map new %u old %u\n",
2623 newmap->m_epoch, oldmap->m_epoch);
2624
2625 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2626 if (mdsc->sessions[i] == NULL)
2627 continue;
2628 s = mdsc->sessions[i];
2629 oldstate = ceph_mdsmap_get_state(oldmap, i);
2630 newstate = ceph_mdsmap_get_state(newmap, i);
2631
2632 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2633 i, ceph_mds_state_name(oldstate),
2634 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2635 ceph_mds_state_name(newstate),
2636 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
2637 session_state_name(s->s_state));
2638
2639 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
2640 ceph_mdsmap_get_addr(newmap, i),
2641 sizeof(struct ceph_entity_addr))) {
2642 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2643 /* the session never opened, just close it
2644 * out now */
2645 __wake_requests(mdsc, &s->s_waiting);
2646 __unregister_session(mdsc, s);
2647 } else {
2648 /* just close it */
2649 mutex_unlock(&mdsc->mutex);
2650 mutex_lock(&s->s_mutex);
2651 mutex_lock(&mdsc->mutex);
2652 ceph_con_close(&s->s_con);
2653 mutex_unlock(&s->s_mutex);
2654 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2655 }
2656
2657 /* kick any requests waiting on the recovering mds */
2658 kick_requests(mdsc, i);
2659 } else if (oldstate == newstate) {
2660 continue; /* nothing new with this mds */
2661 }
2662
2663 /*
2664 * send reconnect?
2665 */
2666 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
2667 newstate >= CEPH_MDS_STATE_RECONNECT) {
2668 mutex_unlock(&mdsc->mutex);
2669 send_mds_reconnect(mdsc, s);
2670 mutex_lock(&mdsc->mutex);
2671 }
2672
2673 /*
2674 * kick request on any mds that has gone active.
2675 */
2676 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
2677 newstate >= CEPH_MDS_STATE_ACTIVE) {
2678 if (oldstate != CEPH_MDS_STATE_CREATING &&
2679 oldstate != CEPH_MDS_STATE_STARTING)
2680 pr_info("mds%d recovery completed\n", s->s_mds);
2681 kick_requests(mdsc, i);
2682 ceph_kick_flushing_caps(mdsc, s);
2683 wake_up_session_caps(s, 1);
2684 }
2685 }
2686
2687 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
2688 s = mdsc->sessions[i];
2689 if (!s)
2690 continue;
2691 if (!ceph_mdsmap_is_laggy(newmap, i))
2692 continue;
2693 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2694 s->s_state == CEPH_MDS_SESSION_HUNG ||
2695 s->s_state == CEPH_MDS_SESSION_CLOSING) {
2696 dout(" connecting to export targets of laggy mds%d\n",
2697 i);
2698 __open_export_target_sessions(mdsc, s);
2699 }
2700 }
2701}
2702
2703
2704
2705/*
2706 * leases
2707 */
2708
2709/*
2710 * caller must hold session s_mutex, dentry->d_lock
2711 */
2712void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
2713{
2714 struct ceph_dentry_info *di = ceph_dentry(dentry);
2715
2716 ceph_put_mds_session(di->lease_session);
2717 di->lease_session = NULL;
2718}
2719
2720static void handle_lease(struct ceph_mds_client *mdsc,
2721 struct ceph_mds_session *session,
2722 struct ceph_msg *msg)
2723{
2724 struct super_block *sb = mdsc->fsc->sb;
2725 struct inode *inode;
2726 struct dentry *parent, *dentry;
2727 struct ceph_dentry_info *di;
2728 int mds = session->s_mds;
2729 struct ceph_mds_lease *h = msg->front.iov_base;
2730 u32 seq;
2731 struct ceph_vino vino;
2732 struct qstr dname;
2733 int release = 0;
2734
2735 dout("handle_lease from mds%d\n", mds);
2736
2737 /* decode */
2738 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
2739 goto bad;
2740 vino.ino = le64_to_cpu(h->ino);
2741 vino.snap = CEPH_NOSNAP;
2742 seq = le32_to_cpu(h->seq);
2743 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
2744 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
2745 if (dname.len != get_unaligned_le32(h+1))
2746 goto bad;
2747
2748 mutex_lock(&session->s_mutex);
2749 session->s_seq++;
2750
2751 /* lookup inode */
2752 inode = ceph_find_inode(sb, vino);
2753 dout("handle_lease %s, ino %llx %p %.*s\n",
2754 ceph_lease_op_name(h->action), vino.ino, inode,
2755 dname.len, dname.name);
2756 if (inode == NULL) {
2757 dout("handle_lease no inode %llx\n", vino.ino);
2758 goto release;
2759 }
2760
2761 /* dentry */
2762 parent = d_find_alias(inode);
2763 if (!parent) {
2764 dout("no parent dentry on inode %p\n", inode);
2765 WARN_ON(1);
2766 goto release; /* hrm... */
2767 }
2768 dname.hash = full_name_hash(dname.name, dname.len);
2769 dentry = d_lookup(parent, &dname);
2770 dput(parent);
2771 if (!dentry)
2772 goto release;
2773
2774 spin_lock(&dentry->d_lock);
2775 di = ceph_dentry(dentry);
2776 switch (h->action) {
2777 case CEPH_MDS_LEASE_REVOKE:
2778 if (di->lease_session == session) {
2779 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
2780 h->seq = cpu_to_le32(di->lease_seq);
2781 __ceph_mdsc_drop_dentry_lease(dentry);
2782 }
2783 release = 1;
2784 break;
2785
2786 case CEPH_MDS_LEASE_RENEW:
2787 if (di->lease_session == session &&
2788 di->lease_gen == session->s_cap_gen &&
2789 di->lease_renew_from &&
2790 di->lease_renew_after == 0) {
2791 unsigned long duration =
2792 le32_to_cpu(h->duration_ms) * HZ / 1000;
2793
2794 di->lease_seq = seq;
2795 dentry->d_time = di->lease_renew_from + duration;
2796 di->lease_renew_after = di->lease_renew_from +
2797 (duration >> 1);
2798 di->lease_renew_from = 0;
2799 }
2800 break;
2801 }
2802 spin_unlock(&dentry->d_lock);
2803 dput(dentry);
2804
2805 if (!release)
2806 goto out;
2807
2808release:
2809 /* let's just reuse the same message */
2810 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
2811 ceph_msg_get(msg);
2812 ceph_con_send(&session->s_con, msg);
2813
2814out:
2815 iput(inode);
2816 mutex_unlock(&session->s_mutex);
2817 return;
2818
2819bad:
2820 pr_err("corrupt lease message\n");
2821 ceph_msg_dump(msg);
2822}
2823
2824void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2825 struct inode *inode,
2826 struct dentry *dentry, char action,
2827 u32 seq)
2828{
2829 struct ceph_msg *msg;
2830 struct ceph_mds_lease *lease;
2831 int len = sizeof(*lease) + sizeof(u32);
2832 int dnamelen = 0;
2833
2834 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2835 inode, dentry, ceph_lease_op_name(action), session->s_mds);
2836 dnamelen = dentry->d_name.len;
2837 len += dnamelen;
2838
2839 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
2840 if (!msg)
2841 return;
2842 lease = msg->front.iov_base;
2843 lease->action = action;
2844 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
2845 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
2846 lease->seq = cpu_to_le32(seq);
2847 put_unaligned_le32(dnamelen, lease + 1);
2848 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
2849
2850 /*
2851 * if this is a preemptive lease RELEASE, no need to
2852 * flush request stream, since the actual request will
2853 * soon follow.
2854 */
2855 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
2856
2857 ceph_con_send(&session->s_con, msg);
2858}
2859
2860/*
2861 * Preemptively release a lease we expect to invalidate anyway.
2862 * Pass @inode always, @dentry is optional.
2863 */
2864void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2865 struct dentry *dentry)
2866{
2867 struct ceph_dentry_info *di;
2868 struct ceph_mds_session *session;
2869 u32 seq;
2870
2871 BUG_ON(inode == NULL);
2872 BUG_ON(dentry == NULL);
2873
2874 /* is dentry lease valid? */
2875 spin_lock(&dentry->d_lock);
2876 di = ceph_dentry(dentry);
2877 if (!di || !di->lease_session ||
2878 di->lease_session->s_mds < 0 ||
2879 di->lease_gen != di->lease_session->s_cap_gen ||
2880 !time_before(jiffies, dentry->d_time)) {
2881 dout("lease_release inode %p dentry %p -- "
2882 "no lease\n",
2883 inode, dentry);
2884 spin_unlock(&dentry->d_lock);
2885 return;
2886 }
2887
2888 /* we do have a lease on this dentry; note mds and seq */
2889 session = ceph_get_mds_session(di->lease_session);
2890 seq = di->lease_seq;
2891 __ceph_mdsc_drop_dentry_lease(dentry);
2892 spin_unlock(&dentry->d_lock);
2893
2894 dout("lease_release inode %p dentry %p to mds%d\n",
2895 inode, dentry, session->s_mds);
2896 ceph_mdsc_lease_send_msg(session, inode, dentry,
2897 CEPH_MDS_LEASE_RELEASE, seq);
2898 ceph_put_mds_session(session);
2899}
2900
2901/*
2902 * drop all leases (and dentry refs) in preparation for umount
2903 */
2904static void drop_leases(struct ceph_mds_client *mdsc)
2905{
2906 int i;
2907
2908 dout("drop_leases\n");
2909 mutex_lock(&mdsc->mutex);
2910 for (i = 0; i < mdsc->max_sessions; i++) {
2911 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2912 if (!s)
2913 continue;
2914 mutex_unlock(&mdsc->mutex);
2915 mutex_lock(&s->s_mutex);
2916 mutex_unlock(&s->s_mutex);
2917 ceph_put_mds_session(s);
2918 mutex_lock(&mdsc->mutex);
2919 }
2920 mutex_unlock(&mdsc->mutex);
2921}
2922
2923
2924
2925/*
2926 * delayed work -- periodically trim expired leases, renew caps with mds
2927 */
2928static void schedule_delayed(struct ceph_mds_client *mdsc)
2929{
2930 int delay = 5;
2931 unsigned hz = round_jiffies_relative(HZ * delay);
2932 schedule_delayed_work(&mdsc->delayed_work, hz);
2933}
2934
2935static void delayed_work(struct work_struct *work)
2936{
2937 int i;
2938 struct ceph_mds_client *mdsc =
2939 container_of(work, struct ceph_mds_client, delayed_work.work);
2940 int renew_interval;
2941 int renew_caps;
2942
2943 dout("mdsc delayed_work\n");
2944 ceph_check_delayed_caps(mdsc);
2945
2946 mutex_lock(&mdsc->mutex);
2947 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
2948 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
2949 mdsc->last_renew_caps);
2950 if (renew_caps)
2951 mdsc->last_renew_caps = jiffies;
2952
2953 for (i = 0; i < mdsc->max_sessions; i++) {
2954 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2955 if (s == NULL)
2956 continue;
2957 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
2958 dout("resending session close request for mds%d\n",
2959 s->s_mds);
2960 request_close_session(mdsc, s);
2961 ceph_put_mds_session(s);
2962 continue;
2963 }
2964 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
2965 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
2966 s->s_state = CEPH_MDS_SESSION_HUNG;
2967 pr_info("mds%d hung\n", s->s_mds);
2968 }
2969 }
2970 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
2971 /* this mds is failed or recovering, just wait */
2972 ceph_put_mds_session(s);
2973 continue;
2974 }
2975 mutex_unlock(&mdsc->mutex);
2976
2977 mutex_lock(&s->s_mutex);
2978 if (renew_caps)
2979 send_renew_caps(mdsc, s);
2980 else
2981 ceph_con_keepalive(&s->s_con);
2982 ceph_add_cap_releases(mdsc, s);
2983 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2984 s->s_state == CEPH_MDS_SESSION_HUNG)
2985 ceph_send_cap_releases(mdsc, s);
2986 mutex_unlock(&s->s_mutex);
2987 ceph_put_mds_session(s);
2988
2989 mutex_lock(&mdsc->mutex);
2990 }
2991 mutex_unlock(&mdsc->mutex);
2992
2993 schedule_delayed(mdsc);
2994}
2995
2996int ceph_mdsc_init(struct ceph_fs_client *fsc)
2997
2998{
2999 struct ceph_mds_client *mdsc;
3000
3001 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3002 if (!mdsc)
3003 return -ENOMEM;
3004 mdsc->fsc = fsc;
3005 fsc->mdsc = mdsc;
3006 mutex_init(&mdsc->mutex);
3007 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3008 if (mdsc->mdsmap == NULL)
3009 return -ENOMEM;
3010
3011 init_completion(&mdsc->safe_umount_waiters);
3012 init_waitqueue_head(&mdsc->session_close_wq);
3013 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3014 mdsc->sessions = NULL;
3015 mdsc->max_sessions = 0;
3016 mdsc->stopping = 0;
3017 init_rwsem(&mdsc->snap_rwsem);
3018 mdsc->snap_realms = RB_ROOT;
3019 INIT_LIST_HEAD(&mdsc->snap_empty);
3020 spin_lock_init(&mdsc->snap_empty_lock);
3021 mdsc->last_tid = 0;
3022 mdsc->request_tree = RB_ROOT;
3023 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3024 mdsc->last_renew_caps = jiffies;
3025 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3026 spin_lock_init(&mdsc->cap_delay_lock);
3027 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3028 spin_lock_init(&mdsc->snap_flush_lock);
3029 mdsc->cap_flush_seq = 0;
3030 INIT_LIST_HEAD(&mdsc->cap_dirty);
3031 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3032 mdsc->num_cap_flushing = 0;
3033 spin_lock_init(&mdsc->cap_dirty_lock);
3034 init_waitqueue_head(&mdsc->cap_flushing_wq);
3035 spin_lock_init(&mdsc->dentry_lru_lock);
3036 INIT_LIST_HEAD(&mdsc->dentry_lru);
3037
3038 ceph_caps_init(mdsc);
3039 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3040
3041 return 0;
3042}
3043
3044/*
3045 * Wait for safe replies on open mds requests. If we time out, drop
3046 * all requests from the tree to avoid dangling dentry refs.
3047 */
3048static void wait_requests(struct ceph_mds_client *mdsc)
3049{
3050 struct ceph_mds_request *req;
3051 struct ceph_fs_client *fsc = mdsc->fsc;
3052
3053 mutex_lock(&mdsc->mutex);
3054 if (__get_oldest_req(mdsc)) {
3055 mutex_unlock(&mdsc->mutex);
3056
3057 dout("wait_requests waiting for requests\n");
3058 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3059 fsc->client->options->mount_timeout * HZ);
3060
3061 /* tear down remaining requests */
3062 mutex_lock(&mdsc->mutex);
3063 while ((req = __get_oldest_req(mdsc))) {
3064 dout("wait_requests timed out on tid %llu\n",
3065 req->r_tid);
3066 __unregister_request(mdsc, req);
3067 }
3068 }
3069 mutex_unlock(&mdsc->mutex);
3070 dout("wait_requests done\n");
3071}
3072
3073/*
3074 * called before mount is ro, and before dentries are torn down.
3075 * (hmm, does this still race with new lookups?)
3076 */
3077void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3078{
3079 dout("pre_umount\n");
3080 mdsc->stopping = 1;
3081
3082 drop_leases(mdsc);
3083 ceph_flush_dirty_caps(mdsc);
3084 wait_requests(mdsc);
3085
3086 /*
3087 * wait for reply handlers to drop their request refs and
3088 * their inode/dcache refs
3089 */
3090 ceph_msgr_flush();
3091}
3092
3093/*
3094 * wait for all write mds requests to flush.
3095 */
3096static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3097{
3098 struct ceph_mds_request *req = NULL, *nextreq;
3099 struct rb_node *n;
3100
3101 mutex_lock(&mdsc->mutex);
3102 dout("wait_unsafe_requests want %lld\n", want_tid);
3103restart:
3104 req = __get_oldest_req(mdsc);
3105 while (req && req->r_tid <= want_tid) {
3106 /* find next request */
3107 n = rb_next(&req->r_node);
3108 if (n)
3109 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3110 else
3111 nextreq = NULL;
3112 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
3113 /* write op */
3114 ceph_mdsc_get_request(req);
3115 if (nextreq)
3116 ceph_mdsc_get_request(nextreq);
3117 mutex_unlock(&mdsc->mutex);
3118 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3119 req->r_tid, want_tid);
3120 wait_for_completion(&req->r_safe_completion);
3121 mutex_lock(&mdsc->mutex);
3122 ceph_mdsc_put_request(req);
3123 if (!nextreq)
3124 break; /* next dne before, so we're done! */
3125 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3126 /* next request was removed from tree */
3127 ceph_mdsc_put_request(nextreq);
3128 goto restart;
3129 }
3130 ceph_mdsc_put_request(nextreq); /* won't go away */
3131 }
3132 req = nextreq;
3133 }
3134 mutex_unlock(&mdsc->mutex);
3135 dout("wait_unsafe_requests done\n");
3136}
3137
3138void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3139{
3140 u64 want_tid, want_flush;
3141
3142 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3143 return;
3144
3145 dout("sync\n");
3146 mutex_lock(&mdsc->mutex);
3147 want_tid = mdsc->last_tid;
3148 want_flush = mdsc->cap_flush_seq;
3149 mutex_unlock(&mdsc->mutex);
3150 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
3151
3152 ceph_flush_dirty_caps(mdsc);
3153
3154 wait_unsafe_requests(mdsc, want_tid);
3155 wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
3156}
3157
3158/*
3159 * true if all sessions are closed, or we force unmount
3160 */
3161static bool done_closing_sessions(struct ceph_mds_client *mdsc)
3162{
3163 int i, n = 0;
3164
3165 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3166 return true;
3167
3168 mutex_lock(&mdsc->mutex);
3169 for (i = 0; i < mdsc->max_sessions; i++)
3170 if (mdsc->sessions[i])
3171 n++;
3172 mutex_unlock(&mdsc->mutex);
3173 return n == 0;
3174}
3175
3176/*
3177 * called after sb is ro.
3178 */
3179void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3180{
3181 struct ceph_mds_session *session;
3182 int i;
3183 struct ceph_fs_client *fsc = mdsc->fsc;
3184 unsigned long timeout = fsc->client->options->mount_timeout * HZ;
3185
3186 dout("close_sessions\n");
3187
3188 /* close sessions */
3189 mutex_lock(&mdsc->mutex);
3190 for (i = 0; i < mdsc->max_sessions; i++) {
3191 session = __ceph_lookup_mds_session(mdsc, i);
3192 if (!session)
3193 continue;
3194 mutex_unlock(&mdsc->mutex);
3195 mutex_lock(&session->s_mutex);
3196 __close_session(mdsc, session);
3197 mutex_unlock(&session->s_mutex);
3198 ceph_put_mds_session(session);
3199 mutex_lock(&mdsc->mutex);
3200 }
3201 mutex_unlock(&mdsc->mutex);
3202
3203 dout("waiting for sessions to close\n");
3204 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3205 timeout);
3206
3207 /* tear down remaining sessions */
3208 mutex_lock(&mdsc->mutex);
3209 for (i = 0; i < mdsc->max_sessions; i++) {
3210 if (mdsc->sessions[i]) {
3211 session = get_session(mdsc->sessions[i]);
3212 __unregister_session(mdsc, session);
3213 mutex_unlock(&mdsc->mutex);
3214 mutex_lock(&session->s_mutex);
3215 remove_session_caps(session);
3216 mutex_unlock(&session->s_mutex);
3217 ceph_put_mds_session(session);
3218 mutex_lock(&mdsc->mutex);
3219 }
3220 }
3221 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3222 mutex_unlock(&mdsc->mutex);
3223
3224 ceph_cleanup_empty_realms(mdsc);
3225
3226 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3227
3228 dout("stopped\n");
3229}
3230
3231static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3232{
3233 dout("stop\n");
3234 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3235 if (mdsc->mdsmap)
3236 ceph_mdsmap_destroy(mdsc->mdsmap);
3237 kfree(mdsc->sessions);
3238 ceph_caps_finalize(mdsc);
3239}
3240
3241void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3242{
3243 struct ceph_mds_client *mdsc = fsc->mdsc;
3244
3245 dout("mdsc_destroy %p\n", mdsc);
3246 ceph_mdsc_stop(mdsc);
3247
3248 /* flush out any connection work with references to us */
3249 ceph_msgr_flush();
3250
3251 fsc->mdsc = NULL;
3252 kfree(mdsc);
3253 dout("mdsc_destroy %p done\n", mdsc);
3254}
3255
3256
3257/*
3258 * handle mds map update.
3259 */
3260void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3261{
3262 u32 epoch;
3263 u32 maplen;
3264 void *p = msg->front.iov_base;
3265 void *end = p + msg->front.iov_len;
3266 struct ceph_mdsmap *newmap, *oldmap;
3267 struct ceph_fsid fsid;
3268 int err = -EINVAL;
3269
3270 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3271 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3272 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3273 return;
3274 epoch = ceph_decode_32(&p);
3275 maplen = ceph_decode_32(&p);
3276 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3277
3278 /* do we need it? */
3279 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
3280 mutex_lock(&mdsc->mutex);
3281 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3282 dout("handle_map epoch %u <= our %u\n",
3283 epoch, mdsc->mdsmap->m_epoch);
3284 mutex_unlock(&mdsc->mutex);
3285 return;
3286 }
3287
3288 newmap = ceph_mdsmap_decode(&p, end);
3289 if (IS_ERR(newmap)) {
3290 err = PTR_ERR(newmap);
3291 goto bad_unlock;
3292 }
3293
3294 /* swap into place */
3295 if (mdsc->mdsmap) {
3296 oldmap = mdsc->mdsmap;
3297 mdsc->mdsmap = newmap;
3298 check_new_map(mdsc, newmap, oldmap);
3299 ceph_mdsmap_destroy(oldmap);
3300 } else {
3301 mdsc->mdsmap = newmap; /* first mds map */
3302 }
3303 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3304
3305 __wake_requests(mdsc, &mdsc->waiting_for_map);
3306
3307 mutex_unlock(&mdsc->mutex);
3308 schedule_delayed(mdsc);
3309 return;
3310
3311bad_unlock:
3312 mutex_unlock(&mdsc->mutex);
3313bad:
3314 pr_err("error decoding mdsmap %d\n", err);
3315 return;
3316}
3317
3318static struct ceph_connection *con_get(struct ceph_connection *con)
3319{
3320 struct ceph_mds_session *s = con->private;
3321
3322 if (get_session(s)) {
3323 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3324 return con;
3325 }
3326 dout("mdsc con_get %p FAIL\n", s);
3327 return NULL;
3328}
3329
3330static void con_put(struct ceph_connection *con)
3331{
3332 struct ceph_mds_session *s = con->private;
3333
3334 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
3335 ceph_put_mds_session(s);
3336}
3337
3338/*
3339 * if the client is unresponsive for long enough, the mds will kill
3340 * the session entirely.
3341 */
3342static void peer_reset(struct ceph_connection *con)
3343{
3344 struct ceph_mds_session *s = con->private;
3345 struct ceph_mds_client *mdsc = s->s_mdsc;
3346
3347 pr_warning("mds%d closed our session\n", s->s_mds);
3348 send_mds_reconnect(mdsc, s);
3349}
3350
3351static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3352{
3353 struct ceph_mds_session *s = con->private;
3354 struct ceph_mds_client *mdsc = s->s_mdsc;
3355 int type = le16_to_cpu(msg->hdr.type);
3356
3357 mutex_lock(&mdsc->mutex);
3358 if (__verify_registered_session(mdsc, s) < 0) {
3359 mutex_unlock(&mdsc->mutex);
3360 goto out;
3361 }
3362 mutex_unlock(&mdsc->mutex);
3363
3364 switch (type) {
3365 case CEPH_MSG_MDS_MAP:
3366 ceph_mdsc_handle_map(mdsc, msg);
3367 break;
3368 case CEPH_MSG_CLIENT_SESSION:
3369 handle_session(s, msg);
3370 break;
3371 case CEPH_MSG_CLIENT_REPLY:
3372 handle_reply(s, msg);
3373 break;
3374 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3375 handle_forward(mdsc, s, msg);
3376 break;
3377 case CEPH_MSG_CLIENT_CAPS:
3378 ceph_handle_caps(s, msg);
3379 break;
3380 case CEPH_MSG_CLIENT_SNAP:
3381 ceph_handle_snap(mdsc, s, msg);
3382 break;
3383 case CEPH_MSG_CLIENT_LEASE:
3384 handle_lease(mdsc, s, msg);
3385 break;
3386
3387 default:
3388 pr_err("received unknown message type %d %s\n", type,
3389 ceph_msg_type_name(type));
3390 }
3391out:
3392 ceph_msg_put(msg);
3393}
3394
3395/*
3396 * authentication
3397 */
3398
3399/*
3400 * Note: returned pointer is the address of a structure that's
3401 * managed separately. Caller must *not* attempt to free it.
3402 */
3403static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
3404 int *proto, int force_new)
3405{
3406 struct ceph_mds_session *s = con->private;
3407 struct ceph_mds_client *mdsc = s->s_mdsc;
3408 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3409 struct ceph_auth_handshake *auth = &s->s_auth;
3410
3411 if (force_new && auth->authorizer) {
3412 if (ac->ops && ac->ops->destroy_authorizer)
3413 ac->ops->destroy_authorizer(ac, auth->authorizer);
3414 auth->authorizer = NULL;
3415 }
3416 if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
3417 int ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3418 auth);
3419 if (ret)
3420 return ERR_PTR(ret);
3421 }
3422 *proto = ac->protocol;
3423
3424 return auth;
3425}
3426
3427
3428static int verify_authorizer_reply(struct ceph_connection *con, int len)
3429{
3430 struct ceph_mds_session *s = con->private;
3431 struct ceph_mds_client *mdsc = s->s_mdsc;
3432 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3433
3434 return ac->ops->verify_authorizer_reply(ac, s->s_auth.authorizer, len);
3435}
3436
3437static int invalidate_authorizer(struct ceph_connection *con)
3438{
3439 struct ceph_mds_session *s = con->private;
3440 struct ceph_mds_client *mdsc = s->s_mdsc;
3441 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3442
3443 if (ac->ops->invalidate_authorizer)
3444 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3445
3446 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
3447}
3448
3449static const struct ceph_connection_operations mds_con_ops = {
3450 .get = con_get,
3451 .put = con_put,
3452 .dispatch = dispatch,
3453 .get_authorizer = get_authorizer,
3454 .verify_authorizer_reply = verify_authorizer_reply,
3455 .invalidate_authorizer = invalidate_authorizer,
3456 .peer_reset = peer_reset,
3457};
3458
3459/* eof */
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#include <linux/bits.h>
13#include <linux/ktime.h>
14#include <linux/bitmap.h>
15#include <linux/mnt_idmapping.h>
16
17#include "super.h"
18#include "mds_client.h"
19#include "crypto.h"
20
21#include <linux/ceph/ceph_features.h>
22#include <linux/ceph/messenger.h>
23#include <linux/ceph/decode.h>
24#include <linux/ceph/pagelist.h>
25#include <linux/ceph/auth.h>
26#include <linux/ceph/debugfs.h>
27
28#define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
29
30/*
31 * A cluster of MDS (metadata server) daemons is responsible for
32 * managing the file system namespace (the directory hierarchy and
33 * inodes) and for coordinating shared access to storage. Metadata is
34 * partitioning hierarchically across a number of servers, and that
35 * partition varies over time as the cluster adjusts the distribution
36 * in order to balance load.
37 *
38 * The MDS client is primarily responsible to managing synchronous
39 * metadata requests for operations like open, unlink, and so forth.
40 * If there is a MDS failure, we find out about it when we (possibly
41 * request and) receive a new MDS map, and can resubmit affected
42 * requests.
43 *
44 * For the most part, though, we take advantage of a lossless
45 * communications channel to the MDS, and do not need to worry about
46 * timing out or resubmitting requests.
47 *
48 * We maintain a stateful "session" with each MDS we interact with.
49 * Within each session, we sent periodic heartbeat messages to ensure
50 * any capabilities or leases we have been issues remain valid. If
51 * the session times out and goes stale, our leases and capabilities
52 * are no longer valid.
53 */
54
55struct ceph_reconnect_state {
56 struct ceph_mds_session *session;
57 int nr_caps, nr_realms;
58 struct ceph_pagelist *pagelist;
59 unsigned msg_version;
60 bool allow_multi;
61};
62
63static void __wake_requests(struct ceph_mds_client *mdsc,
64 struct list_head *head);
65static void ceph_cap_release_work(struct work_struct *work);
66static void ceph_cap_reclaim_work(struct work_struct *work);
67
68static const struct ceph_connection_operations mds_con_ops;
69
70
71/*
72 * mds reply parsing
73 */
74
75static int parse_reply_info_quota(void **p, void *end,
76 struct ceph_mds_reply_info_in *info)
77{
78 u8 struct_v, struct_compat;
79 u32 struct_len;
80
81 ceph_decode_8_safe(p, end, struct_v, bad);
82 ceph_decode_8_safe(p, end, struct_compat, bad);
83 /* struct_v is expected to be >= 1. we only
84 * understand encoding with struct_compat == 1. */
85 if (!struct_v || struct_compat != 1)
86 goto bad;
87 ceph_decode_32_safe(p, end, struct_len, bad);
88 ceph_decode_need(p, end, struct_len, bad);
89 end = *p + struct_len;
90 ceph_decode_64_safe(p, end, info->max_bytes, bad);
91 ceph_decode_64_safe(p, end, info->max_files, bad);
92 *p = end;
93 return 0;
94bad:
95 return -EIO;
96}
97
98/*
99 * parse individual inode info
100 */
101static int parse_reply_info_in(void **p, void *end,
102 struct ceph_mds_reply_info_in *info,
103 u64 features)
104{
105 int err = 0;
106 u8 struct_v = 0;
107
108 if (features == (u64)-1) {
109 u32 struct_len;
110 u8 struct_compat;
111 ceph_decode_8_safe(p, end, struct_v, bad);
112 ceph_decode_8_safe(p, end, struct_compat, bad);
113 /* struct_v is expected to be >= 1. we only understand
114 * encoding with struct_compat == 1. */
115 if (!struct_v || struct_compat != 1)
116 goto bad;
117 ceph_decode_32_safe(p, end, struct_len, bad);
118 ceph_decode_need(p, end, struct_len, bad);
119 end = *p + struct_len;
120 }
121
122 ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad);
123 info->in = *p;
124 *p += sizeof(struct ceph_mds_reply_inode) +
125 sizeof(*info->in->fragtree.splits) *
126 le32_to_cpu(info->in->fragtree.nsplits);
127
128 ceph_decode_32_safe(p, end, info->symlink_len, bad);
129 ceph_decode_need(p, end, info->symlink_len, bad);
130 info->symlink = *p;
131 *p += info->symlink_len;
132
133 ceph_decode_copy_safe(p, end, &info->dir_layout,
134 sizeof(info->dir_layout), bad);
135 ceph_decode_32_safe(p, end, info->xattr_len, bad);
136 ceph_decode_need(p, end, info->xattr_len, bad);
137 info->xattr_data = *p;
138 *p += info->xattr_len;
139
140 if (features == (u64)-1) {
141 /* inline data */
142 ceph_decode_64_safe(p, end, info->inline_version, bad);
143 ceph_decode_32_safe(p, end, info->inline_len, bad);
144 ceph_decode_need(p, end, info->inline_len, bad);
145 info->inline_data = *p;
146 *p += info->inline_len;
147 /* quota */
148 err = parse_reply_info_quota(p, end, info);
149 if (err < 0)
150 goto out_bad;
151 /* pool namespace */
152 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
153 if (info->pool_ns_len > 0) {
154 ceph_decode_need(p, end, info->pool_ns_len, bad);
155 info->pool_ns_data = *p;
156 *p += info->pool_ns_len;
157 }
158
159 /* btime */
160 ceph_decode_need(p, end, sizeof(info->btime), bad);
161 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
162
163 /* change attribute */
164 ceph_decode_64_safe(p, end, info->change_attr, bad);
165
166 /* dir pin */
167 if (struct_v >= 2) {
168 ceph_decode_32_safe(p, end, info->dir_pin, bad);
169 } else {
170 info->dir_pin = -ENODATA;
171 }
172
173 /* snapshot birth time, remains zero for v<=2 */
174 if (struct_v >= 3) {
175 ceph_decode_need(p, end, sizeof(info->snap_btime), bad);
176 ceph_decode_copy(p, &info->snap_btime,
177 sizeof(info->snap_btime));
178 } else {
179 memset(&info->snap_btime, 0, sizeof(info->snap_btime));
180 }
181
182 /* snapshot count, remains zero for v<=3 */
183 if (struct_v >= 4) {
184 ceph_decode_64_safe(p, end, info->rsnaps, bad);
185 } else {
186 info->rsnaps = 0;
187 }
188
189 if (struct_v >= 5) {
190 u32 alen;
191
192 ceph_decode_32_safe(p, end, alen, bad);
193
194 while (alen--) {
195 u32 len;
196
197 /* key */
198 ceph_decode_32_safe(p, end, len, bad);
199 ceph_decode_skip_n(p, end, len, bad);
200 /* value */
201 ceph_decode_32_safe(p, end, len, bad);
202 ceph_decode_skip_n(p, end, len, bad);
203 }
204 }
205
206 /* fscrypt flag -- ignore */
207 if (struct_v >= 6)
208 ceph_decode_skip_8(p, end, bad);
209
210 info->fscrypt_auth = NULL;
211 info->fscrypt_auth_len = 0;
212 info->fscrypt_file = NULL;
213 info->fscrypt_file_len = 0;
214 if (struct_v >= 7) {
215 ceph_decode_32_safe(p, end, info->fscrypt_auth_len, bad);
216 if (info->fscrypt_auth_len) {
217 info->fscrypt_auth = kmalloc(info->fscrypt_auth_len,
218 GFP_KERNEL);
219 if (!info->fscrypt_auth)
220 return -ENOMEM;
221 ceph_decode_copy_safe(p, end, info->fscrypt_auth,
222 info->fscrypt_auth_len, bad);
223 }
224 ceph_decode_32_safe(p, end, info->fscrypt_file_len, bad);
225 if (info->fscrypt_file_len) {
226 info->fscrypt_file = kmalloc(info->fscrypt_file_len,
227 GFP_KERNEL);
228 if (!info->fscrypt_file)
229 return -ENOMEM;
230 ceph_decode_copy_safe(p, end, info->fscrypt_file,
231 info->fscrypt_file_len, bad);
232 }
233 }
234 *p = end;
235 } else {
236 /* legacy (unversioned) struct */
237 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
238 ceph_decode_64_safe(p, end, info->inline_version, bad);
239 ceph_decode_32_safe(p, end, info->inline_len, bad);
240 ceph_decode_need(p, end, info->inline_len, bad);
241 info->inline_data = *p;
242 *p += info->inline_len;
243 } else
244 info->inline_version = CEPH_INLINE_NONE;
245
246 if (features & CEPH_FEATURE_MDS_QUOTA) {
247 err = parse_reply_info_quota(p, end, info);
248 if (err < 0)
249 goto out_bad;
250 } else {
251 info->max_bytes = 0;
252 info->max_files = 0;
253 }
254
255 info->pool_ns_len = 0;
256 info->pool_ns_data = NULL;
257 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
258 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
259 if (info->pool_ns_len > 0) {
260 ceph_decode_need(p, end, info->pool_ns_len, bad);
261 info->pool_ns_data = *p;
262 *p += info->pool_ns_len;
263 }
264 }
265
266 if (features & CEPH_FEATURE_FS_BTIME) {
267 ceph_decode_need(p, end, sizeof(info->btime), bad);
268 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
269 ceph_decode_64_safe(p, end, info->change_attr, bad);
270 }
271
272 info->dir_pin = -ENODATA;
273 /* info->snap_btime and info->rsnaps remain zero */
274 }
275 return 0;
276bad:
277 err = -EIO;
278out_bad:
279 return err;
280}
281
282static int parse_reply_info_dir(void **p, void *end,
283 struct ceph_mds_reply_dirfrag **dirfrag,
284 u64 features)
285{
286 if (features == (u64)-1) {
287 u8 struct_v, struct_compat;
288 u32 struct_len;
289 ceph_decode_8_safe(p, end, struct_v, bad);
290 ceph_decode_8_safe(p, end, struct_compat, bad);
291 /* struct_v is expected to be >= 1. we only understand
292 * encoding whose struct_compat == 1. */
293 if (!struct_v || struct_compat != 1)
294 goto bad;
295 ceph_decode_32_safe(p, end, struct_len, bad);
296 ceph_decode_need(p, end, struct_len, bad);
297 end = *p + struct_len;
298 }
299
300 ceph_decode_need(p, end, sizeof(**dirfrag), bad);
301 *dirfrag = *p;
302 *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist);
303 if (unlikely(*p > end))
304 goto bad;
305 if (features == (u64)-1)
306 *p = end;
307 return 0;
308bad:
309 return -EIO;
310}
311
312static int parse_reply_info_lease(void **p, void *end,
313 struct ceph_mds_reply_lease **lease,
314 u64 features, u32 *altname_len, u8 **altname)
315{
316 u8 struct_v;
317 u32 struct_len;
318 void *lend;
319
320 if (features == (u64)-1) {
321 u8 struct_compat;
322
323 ceph_decode_8_safe(p, end, struct_v, bad);
324 ceph_decode_8_safe(p, end, struct_compat, bad);
325
326 /* struct_v is expected to be >= 1. we only understand
327 * encoding whose struct_compat == 1. */
328 if (!struct_v || struct_compat != 1)
329 goto bad;
330
331 ceph_decode_32_safe(p, end, struct_len, bad);
332 } else {
333 struct_len = sizeof(**lease);
334 *altname_len = 0;
335 *altname = NULL;
336 }
337
338 lend = *p + struct_len;
339 ceph_decode_need(p, end, struct_len, bad);
340 *lease = *p;
341 *p += sizeof(**lease);
342
343 if (features == (u64)-1) {
344 if (struct_v >= 2) {
345 ceph_decode_32_safe(p, end, *altname_len, bad);
346 ceph_decode_need(p, end, *altname_len, bad);
347 *altname = *p;
348 *p += *altname_len;
349 } else {
350 *altname = NULL;
351 *altname_len = 0;
352 }
353 }
354 *p = lend;
355 return 0;
356bad:
357 return -EIO;
358}
359
360/*
361 * parse a normal reply, which may contain a (dir+)dentry and/or a
362 * target inode.
363 */
364static int parse_reply_info_trace(void **p, void *end,
365 struct ceph_mds_reply_info_parsed *info,
366 u64 features)
367{
368 int err;
369
370 if (info->head->is_dentry) {
371 err = parse_reply_info_in(p, end, &info->diri, features);
372 if (err < 0)
373 goto out_bad;
374
375 err = parse_reply_info_dir(p, end, &info->dirfrag, features);
376 if (err < 0)
377 goto out_bad;
378
379 ceph_decode_32_safe(p, end, info->dname_len, bad);
380 ceph_decode_need(p, end, info->dname_len, bad);
381 info->dname = *p;
382 *p += info->dname_len;
383
384 err = parse_reply_info_lease(p, end, &info->dlease, features,
385 &info->altname_len, &info->altname);
386 if (err < 0)
387 goto out_bad;
388 }
389
390 if (info->head->is_target) {
391 err = parse_reply_info_in(p, end, &info->targeti, features);
392 if (err < 0)
393 goto out_bad;
394 }
395
396 if (unlikely(*p != end))
397 goto bad;
398 return 0;
399
400bad:
401 err = -EIO;
402out_bad:
403 pr_err("problem parsing mds trace %d\n", err);
404 return err;
405}
406
407/*
408 * parse readdir results
409 */
410static int parse_reply_info_readdir(void **p, void *end,
411 struct ceph_mds_request *req,
412 u64 features)
413{
414 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
415 struct ceph_client *cl = req->r_mdsc->fsc->client;
416 u32 num, i = 0;
417 int err;
418
419 err = parse_reply_info_dir(p, end, &info->dir_dir, features);
420 if (err < 0)
421 goto out_bad;
422
423 ceph_decode_need(p, end, sizeof(num) + 2, bad);
424 num = ceph_decode_32(p);
425 {
426 u16 flags = ceph_decode_16(p);
427 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
428 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
429 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
430 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
431 }
432 if (num == 0)
433 goto done;
434
435 BUG_ON(!info->dir_entries);
436 if ((unsigned long)(info->dir_entries + num) >
437 (unsigned long)info->dir_entries + info->dir_buf_size) {
438 pr_err_client(cl, "dir contents are larger than expected\n");
439 WARN_ON(1);
440 goto bad;
441 }
442
443 info->dir_nr = num;
444 while (num) {
445 struct inode *inode = d_inode(req->r_dentry);
446 struct ceph_inode_info *ci = ceph_inode(inode);
447 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
448 struct fscrypt_str tname = FSTR_INIT(NULL, 0);
449 struct fscrypt_str oname = FSTR_INIT(NULL, 0);
450 struct ceph_fname fname;
451 u32 altname_len, _name_len;
452 u8 *altname, *_name;
453
454 /* dentry */
455 ceph_decode_32_safe(p, end, _name_len, bad);
456 ceph_decode_need(p, end, _name_len, bad);
457 _name = *p;
458 *p += _name_len;
459 doutc(cl, "parsed dir dname '%.*s'\n", _name_len, _name);
460
461 if (info->hash_order)
462 rde->raw_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
463 _name, _name_len);
464
465 /* dentry lease */
466 err = parse_reply_info_lease(p, end, &rde->lease, features,
467 &altname_len, &altname);
468 if (err)
469 goto out_bad;
470
471 /*
472 * Try to dencrypt the dentry names and update them
473 * in the ceph_mds_reply_dir_entry struct.
474 */
475 fname.dir = inode;
476 fname.name = _name;
477 fname.name_len = _name_len;
478 fname.ctext = altname;
479 fname.ctext_len = altname_len;
480 /*
481 * The _name_len maybe larger than altname_len, such as
482 * when the human readable name length is in range of
483 * (CEPH_NOHASH_NAME_MAX, CEPH_NOHASH_NAME_MAX + SHA256_DIGEST_SIZE),
484 * then the copy in ceph_fname_to_usr will corrupt the
485 * data if there has no encryption key.
486 *
487 * Just set the no_copy flag and then if there has no
488 * encryption key the oname.name will be assigned to
489 * _name always.
490 */
491 fname.no_copy = true;
492 if (altname_len == 0) {
493 /*
494 * Set tname to _name, and this will be used
495 * to do the base64_decode in-place. It's
496 * safe because the decoded string should
497 * always be shorter, which is 3/4 of origin
498 * string.
499 */
500 tname.name = _name;
501
502 /*
503 * Set oname to _name too, and this will be
504 * used to do the dencryption in-place.
505 */
506 oname.name = _name;
507 oname.len = _name_len;
508 } else {
509 /*
510 * This will do the decryption only in-place
511 * from altname cryptext directly.
512 */
513 oname.name = altname;
514 oname.len = altname_len;
515 }
516 rde->is_nokey = false;
517 err = ceph_fname_to_usr(&fname, &tname, &oname, &rde->is_nokey);
518 if (err) {
519 pr_err_client(cl, "unable to decode %.*s, got %d\n",
520 _name_len, _name, err);
521 goto out_bad;
522 }
523 rde->name = oname.name;
524 rde->name_len = oname.len;
525
526 /* inode */
527 err = parse_reply_info_in(p, end, &rde->inode, features);
528 if (err < 0)
529 goto out_bad;
530 /* ceph_readdir_prepopulate() will update it */
531 rde->offset = 0;
532 i++;
533 num--;
534 }
535
536done:
537 /* Skip over any unrecognized fields */
538 *p = end;
539 return 0;
540
541bad:
542 err = -EIO;
543out_bad:
544 pr_err_client(cl, "problem parsing dir contents %d\n", err);
545 return err;
546}
547
548/*
549 * parse fcntl F_GETLK results
550 */
551static int parse_reply_info_filelock(void **p, void *end,
552 struct ceph_mds_reply_info_parsed *info,
553 u64 features)
554{
555 if (*p + sizeof(*info->filelock_reply) > end)
556 goto bad;
557
558 info->filelock_reply = *p;
559
560 /* Skip over any unrecognized fields */
561 *p = end;
562 return 0;
563bad:
564 return -EIO;
565}
566
567
568#if BITS_PER_LONG == 64
569
570#define DELEGATED_INO_AVAILABLE xa_mk_value(1)
571
572static int ceph_parse_deleg_inos(void **p, void *end,
573 struct ceph_mds_session *s)
574{
575 struct ceph_client *cl = s->s_mdsc->fsc->client;
576 u32 sets;
577
578 ceph_decode_32_safe(p, end, sets, bad);
579 doutc(cl, "got %u sets of delegated inodes\n", sets);
580 while (sets--) {
581 u64 start, len;
582
583 ceph_decode_64_safe(p, end, start, bad);
584 ceph_decode_64_safe(p, end, len, bad);
585
586 /* Don't accept a delegation of system inodes */
587 if (start < CEPH_INO_SYSTEM_BASE) {
588 pr_warn_ratelimited_client(cl,
589 "ignoring reserved inode range delegation (start=0x%llx len=0x%llx)\n",
590 start, len);
591 continue;
592 }
593 while (len--) {
594 int err = xa_insert(&s->s_delegated_inos, start++,
595 DELEGATED_INO_AVAILABLE,
596 GFP_KERNEL);
597 if (!err) {
598 doutc(cl, "added delegated inode 0x%llx\n", start - 1);
599 } else if (err == -EBUSY) {
600 pr_warn_client(cl,
601 "MDS delegated inode 0x%llx more than once.\n",
602 start - 1);
603 } else {
604 return err;
605 }
606 }
607 }
608 return 0;
609bad:
610 return -EIO;
611}
612
613u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
614{
615 unsigned long ino;
616 void *val;
617
618 xa_for_each(&s->s_delegated_inos, ino, val) {
619 val = xa_erase(&s->s_delegated_inos, ino);
620 if (val == DELEGATED_INO_AVAILABLE)
621 return ino;
622 }
623 return 0;
624}
625
626int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
627{
628 return xa_insert(&s->s_delegated_inos, ino, DELEGATED_INO_AVAILABLE,
629 GFP_KERNEL);
630}
631#else /* BITS_PER_LONG == 64 */
632/*
633 * FIXME: xarrays can't handle 64-bit indexes on a 32-bit arch. For now, just
634 * ignore delegated_inos on 32 bit arch. Maybe eventually add xarrays for top
635 * and bottom words?
636 */
637static int ceph_parse_deleg_inos(void **p, void *end,
638 struct ceph_mds_session *s)
639{
640 u32 sets;
641
642 ceph_decode_32_safe(p, end, sets, bad);
643 if (sets)
644 ceph_decode_skip_n(p, end, sets * 2 * sizeof(__le64), bad);
645 return 0;
646bad:
647 return -EIO;
648}
649
650u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
651{
652 return 0;
653}
654
655int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
656{
657 return 0;
658}
659#endif /* BITS_PER_LONG == 64 */
660
661/*
662 * parse create results
663 */
664static int parse_reply_info_create(void **p, void *end,
665 struct ceph_mds_reply_info_parsed *info,
666 u64 features, struct ceph_mds_session *s)
667{
668 int ret;
669
670 if (features == (u64)-1 ||
671 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) {
672 if (*p == end) {
673 /* Malformed reply? */
674 info->has_create_ino = false;
675 } else if (test_bit(CEPHFS_FEATURE_DELEG_INO, &s->s_features)) {
676 info->has_create_ino = true;
677 /* struct_v, struct_compat, and len */
678 ceph_decode_skip_n(p, end, 2 + sizeof(u32), bad);
679 ceph_decode_64_safe(p, end, info->ino, bad);
680 ret = ceph_parse_deleg_inos(p, end, s);
681 if (ret)
682 return ret;
683 } else {
684 /* legacy */
685 ceph_decode_64_safe(p, end, info->ino, bad);
686 info->has_create_ino = true;
687 }
688 } else {
689 if (*p != end)
690 goto bad;
691 }
692
693 /* Skip over any unrecognized fields */
694 *p = end;
695 return 0;
696bad:
697 return -EIO;
698}
699
700static int parse_reply_info_getvxattr(void **p, void *end,
701 struct ceph_mds_reply_info_parsed *info,
702 u64 features)
703{
704 u32 value_len;
705
706 ceph_decode_skip_8(p, end, bad); /* skip current version: 1 */
707 ceph_decode_skip_8(p, end, bad); /* skip first version: 1 */
708 ceph_decode_skip_32(p, end, bad); /* skip payload length */
709
710 ceph_decode_32_safe(p, end, value_len, bad);
711
712 if (value_len == end - *p) {
713 info->xattr_info.xattr_value = *p;
714 info->xattr_info.xattr_value_len = value_len;
715 *p = end;
716 return value_len;
717 }
718bad:
719 return -EIO;
720}
721
722/*
723 * parse extra results
724 */
725static int parse_reply_info_extra(void **p, void *end,
726 struct ceph_mds_request *req,
727 u64 features, struct ceph_mds_session *s)
728{
729 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
730 u32 op = le32_to_cpu(info->head->op);
731
732 if (op == CEPH_MDS_OP_GETFILELOCK)
733 return parse_reply_info_filelock(p, end, info, features);
734 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
735 return parse_reply_info_readdir(p, end, req, features);
736 else if (op == CEPH_MDS_OP_CREATE)
737 return parse_reply_info_create(p, end, info, features, s);
738 else if (op == CEPH_MDS_OP_GETVXATTR)
739 return parse_reply_info_getvxattr(p, end, info, features);
740 else
741 return -EIO;
742}
743
744/*
745 * parse entire mds reply
746 */
747static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg,
748 struct ceph_mds_request *req, u64 features)
749{
750 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
751 struct ceph_client *cl = s->s_mdsc->fsc->client;
752 void *p, *end;
753 u32 len;
754 int err;
755
756 info->head = msg->front.iov_base;
757 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
758 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
759
760 /* trace */
761 ceph_decode_32_safe(&p, end, len, bad);
762 if (len > 0) {
763 ceph_decode_need(&p, end, len, bad);
764 err = parse_reply_info_trace(&p, p+len, info, features);
765 if (err < 0)
766 goto out_bad;
767 }
768
769 /* extra */
770 ceph_decode_32_safe(&p, end, len, bad);
771 if (len > 0) {
772 ceph_decode_need(&p, end, len, bad);
773 err = parse_reply_info_extra(&p, p+len, req, features, s);
774 if (err < 0)
775 goto out_bad;
776 }
777
778 /* snap blob */
779 ceph_decode_32_safe(&p, end, len, bad);
780 info->snapblob_len = len;
781 info->snapblob = p;
782 p += len;
783
784 if (p != end)
785 goto bad;
786 return 0;
787
788bad:
789 err = -EIO;
790out_bad:
791 pr_err_client(cl, "mds parse_reply err %d\n", err);
792 ceph_msg_dump(msg);
793 return err;
794}
795
796static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
797{
798 int i;
799
800 kfree(info->diri.fscrypt_auth);
801 kfree(info->diri.fscrypt_file);
802 kfree(info->targeti.fscrypt_auth);
803 kfree(info->targeti.fscrypt_file);
804 if (!info->dir_entries)
805 return;
806
807 for (i = 0; i < info->dir_nr; i++) {
808 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
809
810 kfree(rde->inode.fscrypt_auth);
811 kfree(rde->inode.fscrypt_file);
812 }
813 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
814}
815
816/*
817 * In async unlink case the kclient won't wait for the first reply
818 * from MDS and just drop all the links and unhash the dentry and then
819 * succeeds immediately.
820 *
821 * For any new create/link/rename,etc requests followed by using the
822 * same file names we must wait for the first reply of the inflight
823 * unlink request, or the MDS possibly will fail these following
824 * requests with -EEXIST if the inflight async unlink request was
825 * delayed for some reasons.
826 *
827 * And the worst case is that for the none async openc request it will
828 * successfully open the file if the CDentry hasn't been unlinked yet,
829 * but later the previous delayed async unlink request will remove the
830 * CDenty. That means the just created file is possiblly deleted later
831 * by accident.
832 *
833 * We need to wait for the inflight async unlink requests to finish
834 * when creating new files/directories by using the same file names.
835 */
836int ceph_wait_on_conflict_unlink(struct dentry *dentry)
837{
838 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb);
839 struct ceph_client *cl = fsc->client;
840 struct dentry *pdentry = dentry->d_parent;
841 struct dentry *udentry, *found = NULL;
842 struct ceph_dentry_info *di;
843 struct qstr dname;
844 u32 hash = dentry->d_name.hash;
845 int err;
846
847 dname.name = dentry->d_name.name;
848 dname.len = dentry->d_name.len;
849
850 rcu_read_lock();
851 hash_for_each_possible_rcu(fsc->async_unlink_conflict, di,
852 hnode, hash) {
853 udentry = di->dentry;
854
855 spin_lock(&udentry->d_lock);
856 if (udentry->d_name.hash != hash)
857 goto next;
858 if (unlikely(udentry->d_parent != pdentry))
859 goto next;
860 if (!hash_hashed(&di->hnode))
861 goto next;
862
863 if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags))
864 pr_warn_client(cl, "dentry %p:%pd async unlink bit is not set\n",
865 dentry, dentry);
866
867 if (!d_same_name(udentry, pdentry, &dname))
868 goto next;
869
870 found = dget_dlock(udentry);
871 spin_unlock(&udentry->d_lock);
872 break;
873next:
874 spin_unlock(&udentry->d_lock);
875 }
876 rcu_read_unlock();
877
878 if (likely(!found))
879 return 0;
880
881 doutc(cl, "dentry %p:%pd conflict with old %p:%pd\n", dentry, dentry,
882 found, found);
883
884 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_UNLINK_BIT,
885 TASK_KILLABLE);
886 dput(found);
887 return err;
888}
889
890
891/*
892 * sessions
893 */
894const char *ceph_session_state_name(int s)
895{
896 switch (s) {
897 case CEPH_MDS_SESSION_NEW: return "new";
898 case CEPH_MDS_SESSION_OPENING: return "opening";
899 case CEPH_MDS_SESSION_OPEN: return "open";
900 case CEPH_MDS_SESSION_HUNG: return "hung";
901 case CEPH_MDS_SESSION_CLOSING: return "closing";
902 case CEPH_MDS_SESSION_CLOSED: return "closed";
903 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
904 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
905 case CEPH_MDS_SESSION_REJECTED: return "rejected";
906 default: return "???";
907 }
908}
909
910struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s)
911{
912 if (refcount_inc_not_zero(&s->s_ref))
913 return s;
914 return NULL;
915}
916
917void ceph_put_mds_session(struct ceph_mds_session *s)
918{
919 if (IS_ERR_OR_NULL(s))
920 return;
921
922 if (refcount_dec_and_test(&s->s_ref)) {
923 if (s->s_auth.authorizer)
924 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
925 WARN_ON(mutex_is_locked(&s->s_mutex));
926 xa_destroy(&s->s_delegated_inos);
927 kfree(s);
928 }
929}
930
931/*
932 * called under mdsc->mutex
933 */
934struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
935 int mds)
936{
937 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
938 return NULL;
939 return ceph_get_mds_session(mdsc->sessions[mds]);
940}
941
942static bool __have_session(struct ceph_mds_client *mdsc, int mds)
943{
944 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
945 return false;
946 else
947 return true;
948}
949
950static int __verify_registered_session(struct ceph_mds_client *mdsc,
951 struct ceph_mds_session *s)
952{
953 if (s->s_mds >= mdsc->max_sessions ||
954 mdsc->sessions[s->s_mds] != s)
955 return -ENOENT;
956 return 0;
957}
958
959/*
960 * create+register a new session for given mds.
961 * called under mdsc->mutex.
962 */
963static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
964 int mds)
965{
966 struct ceph_client *cl = mdsc->fsc->client;
967 struct ceph_mds_session *s;
968
969 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO)
970 return ERR_PTR(-EIO);
971
972 if (mds >= mdsc->mdsmap->possible_max_rank)
973 return ERR_PTR(-EINVAL);
974
975 s = kzalloc(sizeof(*s), GFP_NOFS);
976 if (!s)
977 return ERR_PTR(-ENOMEM);
978
979 if (mds >= mdsc->max_sessions) {
980 int newmax = 1 << get_count_order(mds + 1);
981 struct ceph_mds_session **sa;
982
983 doutc(cl, "realloc to %d\n", newmax);
984 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
985 if (!sa)
986 goto fail_realloc;
987 if (mdsc->sessions) {
988 memcpy(sa, mdsc->sessions,
989 mdsc->max_sessions * sizeof(void *));
990 kfree(mdsc->sessions);
991 }
992 mdsc->sessions = sa;
993 mdsc->max_sessions = newmax;
994 }
995
996 doutc(cl, "mds%d\n", mds);
997 s->s_mdsc = mdsc;
998 s->s_mds = mds;
999 s->s_state = CEPH_MDS_SESSION_NEW;
1000 mutex_init(&s->s_mutex);
1001
1002 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
1003
1004 atomic_set(&s->s_cap_gen, 1);
1005 s->s_cap_ttl = jiffies - 1;
1006
1007 spin_lock_init(&s->s_cap_lock);
1008 INIT_LIST_HEAD(&s->s_caps);
1009 refcount_set(&s->s_ref, 1);
1010 INIT_LIST_HEAD(&s->s_waiting);
1011 INIT_LIST_HEAD(&s->s_unsafe);
1012 xa_init(&s->s_delegated_inos);
1013 INIT_LIST_HEAD(&s->s_cap_releases);
1014 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
1015
1016 INIT_LIST_HEAD(&s->s_cap_dirty);
1017 INIT_LIST_HEAD(&s->s_cap_flushing);
1018
1019 mdsc->sessions[mds] = s;
1020 atomic_inc(&mdsc->num_sessions);
1021 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
1022
1023 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
1024 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
1025
1026 return s;
1027
1028fail_realloc:
1029 kfree(s);
1030 return ERR_PTR(-ENOMEM);
1031}
1032
1033/*
1034 * called under mdsc->mutex
1035 */
1036static void __unregister_session(struct ceph_mds_client *mdsc,
1037 struct ceph_mds_session *s)
1038{
1039 doutc(mdsc->fsc->client, "mds%d %p\n", s->s_mds, s);
1040 BUG_ON(mdsc->sessions[s->s_mds] != s);
1041 mdsc->sessions[s->s_mds] = NULL;
1042 ceph_con_close(&s->s_con);
1043 ceph_put_mds_session(s);
1044 atomic_dec(&mdsc->num_sessions);
1045}
1046
1047/*
1048 * drop session refs in request.
1049 *
1050 * should be last request ref, or hold mdsc->mutex
1051 */
1052static void put_request_session(struct ceph_mds_request *req)
1053{
1054 if (req->r_session) {
1055 ceph_put_mds_session(req->r_session);
1056 req->r_session = NULL;
1057 }
1058}
1059
1060void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc,
1061 void (*cb)(struct ceph_mds_session *),
1062 bool check_state)
1063{
1064 int mds;
1065
1066 mutex_lock(&mdsc->mutex);
1067 for (mds = 0; mds < mdsc->max_sessions; ++mds) {
1068 struct ceph_mds_session *s;
1069
1070 s = __ceph_lookup_mds_session(mdsc, mds);
1071 if (!s)
1072 continue;
1073
1074 if (check_state && !check_session_state(s)) {
1075 ceph_put_mds_session(s);
1076 continue;
1077 }
1078
1079 mutex_unlock(&mdsc->mutex);
1080 cb(s);
1081 ceph_put_mds_session(s);
1082 mutex_lock(&mdsc->mutex);
1083 }
1084 mutex_unlock(&mdsc->mutex);
1085}
1086
1087void ceph_mdsc_release_request(struct kref *kref)
1088{
1089 struct ceph_mds_request *req = container_of(kref,
1090 struct ceph_mds_request,
1091 r_kref);
1092 ceph_mdsc_release_dir_caps_async(req);
1093 destroy_reply_info(&req->r_reply_info);
1094 if (req->r_request)
1095 ceph_msg_put(req->r_request);
1096 if (req->r_reply)
1097 ceph_msg_put(req->r_reply);
1098 if (req->r_inode) {
1099 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
1100 iput(req->r_inode);
1101 }
1102 if (req->r_parent) {
1103 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
1104 iput(req->r_parent);
1105 }
1106 iput(req->r_target_inode);
1107 iput(req->r_new_inode);
1108 if (req->r_dentry)
1109 dput(req->r_dentry);
1110 if (req->r_old_dentry)
1111 dput(req->r_old_dentry);
1112 if (req->r_old_dentry_dir) {
1113 /*
1114 * track (and drop pins for) r_old_dentry_dir
1115 * separately, since r_old_dentry's d_parent may have
1116 * changed between the dir mutex being dropped and
1117 * this request being freed.
1118 */
1119 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
1120 CEPH_CAP_PIN);
1121 iput(req->r_old_dentry_dir);
1122 }
1123 kfree(req->r_path1);
1124 kfree(req->r_path2);
1125 put_cred(req->r_cred);
1126 if (req->r_mnt_idmap)
1127 mnt_idmap_put(req->r_mnt_idmap);
1128 if (req->r_pagelist)
1129 ceph_pagelist_release(req->r_pagelist);
1130 kfree(req->r_fscrypt_auth);
1131 kfree(req->r_altname);
1132 put_request_session(req);
1133 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
1134 WARN_ON_ONCE(!list_empty(&req->r_wait));
1135 kmem_cache_free(ceph_mds_request_cachep, req);
1136}
1137
1138DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
1139
1140/*
1141 * lookup session, bump ref if found.
1142 *
1143 * called under mdsc->mutex.
1144 */
1145static struct ceph_mds_request *
1146lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
1147{
1148 struct ceph_mds_request *req;
1149
1150 req = lookup_request(&mdsc->request_tree, tid);
1151 if (req)
1152 ceph_mdsc_get_request(req);
1153
1154 return req;
1155}
1156
1157/*
1158 * Register an in-flight request, and assign a tid. Link to directory
1159 * are modifying (if any).
1160 *
1161 * Called under mdsc->mutex.
1162 */
1163static void __register_request(struct ceph_mds_client *mdsc,
1164 struct ceph_mds_request *req,
1165 struct inode *dir)
1166{
1167 struct ceph_client *cl = mdsc->fsc->client;
1168 int ret = 0;
1169
1170 req->r_tid = ++mdsc->last_tid;
1171 if (req->r_num_caps) {
1172 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
1173 req->r_num_caps);
1174 if (ret < 0) {
1175 pr_err_client(cl, "%p failed to reserve caps: %d\n",
1176 req, ret);
1177 /* set req->r_err to fail early from __do_request */
1178 req->r_err = ret;
1179 return;
1180 }
1181 }
1182 doutc(cl, "%p tid %lld\n", req, req->r_tid);
1183 ceph_mdsc_get_request(req);
1184 insert_request(&mdsc->request_tree, req);
1185
1186 req->r_cred = get_current_cred();
1187 if (!req->r_mnt_idmap)
1188 req->r_mnt_idmap = &nop_mnt_idmap;
1189
1190 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
1191 mdsc->oldest_tid = req->r_tid;
1192
1193 if (dir) {
1194 struct ceph_inode_info *ci = ceph_inode(dir);
1195
1196 ihold(dir);
1197 req->r_unsafe_dir = dir;
1198 spin_lock(&ci->i_unsafe_lock);
1199 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
1200 spin_unlock(&ci->i_unsafe_lock);
1201 }
1202}
1203
1204static void __unregister_request(struct ceph_mds_client *mdsc,
1205 struct ceph_mds_request *req)
1206{
1207 doutc(mdsc->fsc->client, "%p tid %lld\n", req, req->r_tid);
1208
1209 /* Never leave an unregistered request on an unsafe list! */
1210 list_del_init(&req->r_unsafe_item);
1211
1212 if (req->r_tid == mdsc->oldest_tid) {
1213 struct rb_node *p = rb_next(&req->r_node);
1214 mdsc->oldest_tid = 0;
1215 while (p) {
1216 struct ceph_mds_request *next_req =
1217 rb_entry(p, struct ceph_mds_request, r_node);
1218 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
1219 mdsc->oldest_tid = next_req->r_tid;
1220 break;
1221 }
1222 p = rb_next(p);
1223 }
1224 }
1225
1226 erase_request(&mdsc->request_tree, req);
1227
1228 if (req->r_unsafe_dir) {
1229 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
1230 spin_lock(&ci->i_unsafe_lock);
1231 list_del_init(&req->r_unsafe_dir_item);
1232 spin_unlock(&ci->i_unsafe_lock);
1233 }
1234 if (req->r_target_inode &&
1235 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
1236 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
1237 spin_lock(&ci->i_unsafe_lock);
1238 list_del_init(&req->r_unsafe_target_item);
1239 spin_unlock(&ci->i_unsafe_lock);
1240 }
1241
1242 if (req->r_unsafe_dir) {
1243 iput(req->r_unsafe_dir);
1244 req->r_unsafe_dir = NULL;
1245 }
1246
1247 complete_all(&req->r_safe_completion);
1248
1249 ceph_mdsc_put_request(req);
1250}
1251
1252/*
1253 * Walk back up the dentry tree until we hit a dentry representing a
1254 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
1255 * when calling this) to ensure that the objects won't disappear while we're
1256 * working with them. Once we hit a candidate dentry, we attempt to take a
1257 * reference to it, and return that as the result.
1258 */
1259static struct inode *get_nonsnap_parent(struct dentry *dentry)
1260{
1261 struct inode *inode = NULL;
1262
1263 while (dentry && !IS_ROOT(dentry)) {
1264 inode = d_inode_rcu(dentry);
1265 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
1266 break;
1267 dentry = dentry->d_parent;
1268 }
1269 if (inode)
1270 inode = igrab(inode);
1271 return inode;
1272}
1273
1274/*
1275 * Choose mds to send request to next. If there is a hint set in the
1276 * request (e.g., due to a prior forward hint from the mds), use that.
1277 * Otherwise, consult frag tree and/or caps to identify the
1278 * appropriate mds. If all else fails, choose randomly.
1279 *
1280 * Called under mdsc->mutex.
1281 */
1282static int __choose_mds(struct ceph_mds_client *mdsc,
1283 struct ceph_mds_request *req,
1284 bool *random)
1285{
1286 struct inode *inode;
1287 struct ceph_inode_info *ci;
1288 struct ceph_cap *cap;
1289 int mode = req->r_direct_mode;
1290 int mds = -1;
1291 u32 hash = req->r_direct_hash;
1292 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
1293 struct ceph_client *cl = mdsc->fsc->client;
1294
1295 if (random)
1296 *random = false;
1297
1298 /*
1299 * is there a specific mds we should try? ignore hint if we have
1300 * no session and the mds is not up (active or recovering).
1301 */
1302 if (req->r_resend_mds >= 0 &&
1303 (__have_session(mdsc, req->r_resend_mds) ||
1304 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
1305 doutc(cl, "using resend_mds mds%d\n", req->r_resend_mds);
1306 return req->r_resend_mds;
1307 }
1308
1309 if (mode == USE_RANDOM_MDS)
1310 goto random;
1311
1312 inode = NULL;
1313 if (req->r_inode) {
1314 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
1315 inode = req->r_inode;
1316 ihold(inode);
1317 } else {
1318 /* req->r_dentry is non-null for LSSNAP request */
1319 rcu_read_lock();
1320 inode = get_nonsnap_parent(req->r_dentry);
1321 rcu_read_unlock();
1322 doutc(cl, "using snapdir's parent %p %llx.%llx\n",
1323 inode, ceph_vinop(inode));
1324 }
1325 } else if (req->r_dentry) {
1326 /* ignore race with rename; old or new d_parent is okay */
1327 struct dentry *parent;
1328 struct inode *dir;
1329
1330 rcu_read_lock();
1331 parent = READ_ONCE(req->r_dentry->d_parent);
1332 dir = req->r_parent ? : d_inode_rcu(parent);
1333
1334 if (!dir || dir->i_sb != mdsc->fsc->sb) {
1335 /* not this fs or parent went negative */
1336 inode = d_inode(req->r_dentry);
1337 if (inode)
1338 ihold(inode);
1339 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
1340 /* direct snapped/virtual snapdir requests
1341 * based on parent dir inode */
1342 inode = get_nonsnap_parent(parent);
1343 doutc(cl, "using nonsnap parent %p %llx.%llx\n",
1344 inode, ceph_vinop(inode));
1345 } else {
1346 /* dentry target */
1347 inode = d_inode(req->r_dentry);
1348 if (!inode || mode == USE_AUTH_MDS) {
1349 /* dir + name */
1350 inode = igrab(dir);
1351 hash = ceph_dentry_hash(dir, req->r_dentry);
1352 is_hash = true;
1353 } else {
1354 ihold(inode);
1355 }
1356 }
1357 rcu_read_unlock();
1358 }
1359
1360 if (!inode)
1361 goto random;
1362
1363 doutc(cl, "%p %llx.%llx is_hash=%d (0x%x) mode %d\n", inode,
1364 ceph_vinop(inode), (int)is_hash, hash, mode);
1365 ci = ceph_inode(inode);
1366
1367 if (is_hash && S_ISDIR(inode->i_mode)) {
1368 struct ceph_inode_frag frag;
1369 int found;
1370
1371 ceph_choose_frag(ci, hash, &frag, &found);
1372 if (found) {
1373 if (mode == USE_ANY_MDS && frag.ndist > 0) {
1374 u8 r;
1375
1376 /* choose a random replica */
1377 get_random_bytes(&r, 1);
1378 r %= frag.ndist;
1379 mds = frag.dist[r];
1380 doutc(cl, "%p %llx.%llx frag %u mds%d (%d/%d)\n",
1381 inode, ceph_vinop(inode), frag.frag,
1382 mds, (int)r, frag.ndist);
1383 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
1384 CEPH_MDS_STATE_ACTIVE &&
1385 !ceph_mdsmap_is_laggy(mdsc->mdsmap, mds))
1386 goto out;
1387 }
1388
1389 /* since this file/dir wasn't known to be
1390 * replicated, then we want to look for the
1391 * authoritative mds. */
1392 if (frag.mds >= 0) {
1393 /* choose auth mds */
1394 mds = frag.mds;
1395 doutc(cl, "%p %llx.%llx frag %u mds%d (auth)\n",
1396 inode, ceph_vinop(inode), frag.frag, mds);
1397 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
1398 CEPH_MDS_STATE_ACTIVE) {
1399 if (!ceph_mdsmap_is_laggy(mdsc->mdsmap,
1400 mds))
1401 goto out;
1402 }
1403 }
1404 mode = USE_AUTH_MDS;
1405 }
1406 }
1407
1408 spin_lock(&ci->i_ceph_lock);
1409 cap = NULL;
1410 if (mode == USE_AUTH_MDS)
1411 cap = ci->i_auth_cap;
1412 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
1413 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
1414 if (!cap) {
1415 spin_unlock(&ci->i_ceph_lock);
1416 iput(inode);
1417 goto random;
1418 }
1419 mds = cap->session->s_mds;
1420 doutc(cl, "%p %llx.%llx mds%d (%scap %p)\n", inode,
1421 ceph_vinop(inode), mds,
1422 cap == ci->i_auth_cap ? "auth " : "", cap);
1423 spin_unlock(&ci->i_ceph_lock);
1424out:
1425 iput(inode);
1426 return mds;
1427
1428random:
1429 if (random)
1430 *random = true;
1431
1432 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
1433 doutc(cl, "chose random mds%d\n", mds);
1434 return mds;
1435}
1436
1437
1438/*
1439 * session messages
1440 */
1441struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq)
1442{
1443 struct ceph_msg *msg;
1444 struct ceph_mds_session_head *h;
1445
1446 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
1447 false);
1448 if (!msg) {
1449 pr_err("ENOMEM creating session %s msg\n",
1450 ceph_session_op_name(op));
1451 return NULL;
1452 }
1453 h = msg->front.iov_base;
1454 h->op = cpu_to_le32(op);
1455 h->seq = cpu_to_le64(seq);
1456
1457 return msg;
1458}
1459
1460static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
1461#define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8)
1462static int encode_supported_features(void **p, void *end)
1463{
1464 static const size_t count = ARRAY_SIZE(feature_bits);
1465
1466 if (count > 0) {
1467 size_t i;
1468 size_t size = FEATURE_BYTES(count);
1469 unsigned long bit;
1470
1471 if (WARN_ON_ONCE(*p + 4 + size > end))
1472 return -ERANGE;
1473
1474 ceph_encode_32(p, size);
1475 memset(*p, 0, size);
1476 for (i = 0; i < count; i++) {
1477 bit = feature_bits[i];
1478 ((unsigned char *)(*p))[bit / 8] |= BIT(bit % 8);
1479 }
1480 *p += size;
1481 } else {
1482 if (WARN_ON_ONCE(*p + 4 > end))
1483 return -ERANGE;
1484
1485 ceph_encode_32(p, 0);
1486 }
1487
1488 return 0;
1489}
1490
1491static const unsigned char metric_bits[] = CEPHFS_METRIC_SPEC_CLIENT_SUPPORTED;
1492#define METRIC_BYTES(cnt) (DIV_ROUND_UP((size_t)metric_bits[cnt - 1] + 1, 64) * 8)
1493static int encode_metric_spec(void **p, void *end)
1494{
1495 static const size_t count = ARRAY_SIZE(metric_bits);
1496
1497 /* header */
1498 if (WARN_ON_ONCE(*p + 2 > end))
1499 return -ERANGE;
1500
1501 ceph_encode_8(p, 1); /* version */
1502 ceph_encode_8(p, 1); /* compat */
1503
1504 if (count > 0) {
1505 size_t i;
1506 size_t size = METRIC_BYTES(count);
1507
1508 if (WARN_ON_ONCE(*p + 4 + 4 + size > end))
1509 return -ERANGE;
1510
1511 /* metric spec info length */
1512 ceph_encode_32(p, 4 + size);
1513
1514 /* metric spec */
1515 ceph_encode_32(p, size);
1516 memset(*p, 0, size);
1517 for (i = 0; i < count; i++)
1518 ((unsigned char *)(*p))[i / 8] |= BIT(metric_bits[i] % 8);
1519 *p += size;
1520 } else {
1521 if (WARN_ON_ONCE(*p + 4 + 4 > end))
1522 return -ERANGE;
1523
1524 /* metric spec info length */
1525 ceph_encode_32(p, 4);
1526 /* metric spec */
1527 ceph_encode_32(p, 0);
1528 }
1529
1530 return 0;
1531}
1532
1533/*
1534 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
1535 * to include additional client metadata fields.
1536 */
1537static struct ceph_msg *
1538create_session_full_msg(struct ceph_mds_client *mdsc, int op, u64 seq)
1539{
1540 struct ceph_msg *msg;
1541 struct ceph_mds_session_head *h;
1542 int i;
1543 int extra_bytes = 0;
1544 int metadata_key_count = 0;
1545 struct ceph_options *opt = mdsc->fsc->client->options;
1546 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
1547 struct ceph_client *cl = mdsc->fsc->client;
1548 size_t size, count;
1549 void *p, *end;
1550 int ret;
1551
1552 const char* metadata[][2] = {
1553 {"hostname", mdsc->nodename},
1554 {"kernel_version", init_utsname()->release},
1555 {"entity_id", opt->name ? : ""},
1556 {"root", fsopt->server_path ? : "/"},
1557 {NULL, NULL}
1558 };
1559
1560 /* Calculate serialized length of metadata */
1561 extra_bytes = 4; /* map length */
1562 for (i = 0; metadata[i][0]; ++i) {
1563 extra_bytes += 8 + strlen(metadata[i][0]) +
1564 strlen(metadata[i][1]);
1565 metadata_key_count++;
1566 }
1567
1568 /* supported feature */
1569 size = 0;
1570 count = ARRAY_SIZE(feature_bits);
1571 if (count > 0)
1572 size = FEATURE_BYTES(count);
1573 extra_bytes += 4 + size;
1574
1575 /* metric spec */
1576 size = 0;
1577 count = ARRAY_SIZE(metric_bits);
1578 if (count > 0)
1579 size = METRIC_BYTES(count);
1580 extra_bytes += 2 + 4 + 4 + size;
1581
1582 /* flags, mds auth caps and oldest_client_tid */
1583 extra_bytes += 4 + 4 + 8;
1584
1585 /* Allocate the message */
1586 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
1587 GFP_NOFS, false);
1588 if (!msg) {
1589 pr_err_client(cl, "ENOMEM creating session open msg\n");
1590 return ERR_PTR(-ENOMEM);
1591 }
1592 p = msg->front.iov_base;
1593 end = p + msg->front.iov_len;
1594
1595 h = p;
1596 h->op = cpu_to_le32(op);
1597 h->seq = cpu_to_le64(seq);
1598
1599 /*
1600 * Serialize client metadata into waiting buffer space, using
1601 * the format that userspace expects for map<string, string>
1602 *
1603 * ClientSession messages with metadata are v7
1604 */
1605 msg->hdr.version = cpu_to_le16(7);
1606 msg->hdr.compat_version = cpu_to_le16(1);
1607
1608 /* The write pointer, following the session_head structure */
1609 p += sizeof(*h);
1610
1611 /* Number of entries in the map */
1612 ceph_encode_32(&p, metadata_key_count);
1613
1614 /* Two length-prefixed strings for each entry in the map */
1615 for (i = 0; metadata[i][0]; ++i) {
1616 size_t const key_len = strlen(metadata[i][0]);
1617 size_t const val_len = strlen(metadata[i][1]);
1618
1619 ceph_encode_32(&p, key_len);
1620 memcpy(p, metadata[i][0], key_len);
1621 p += key_len;
1622 ceph_encode_32(&p, val_len);
1623 memcpy(p, metadata[i][1], val_len);
1624 p += val_len;
1625 }
1626
1627 ret = encode_supported_features(&p, end);
1628 if (ret) {
1629 pr_err_client(cl, "encode_supported_features failed!\n");
1630 ceph_msg_put(msg);
1631 return ERR_PTR(ret);
1632 }
1633
1634 ret = encode_metric_spec(&p, end);
1635 if (ret) {
1636 pr_err_client(cl, "encode_metric_spec failed!\n");
1637 ceph_msg_put(msg);
1638 return ERR_PTR(ret);
1639 }
1640
1641 /* version == 5, flags */
1642 ceph_encode_32(&p, 0);
1643
1644 /* version == 6, mds auth caps */
1645 ceph_encode_32(&p, 0);
1646
1647 /* version == 7, oldest_client_tid */
1648 ceph_encode_64(&p, mdsc->oldest_tid);
1649
1650 msg->front.iov_len = p - msg->front.iov_base;
1651 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1652
1653 return msg;
1654}
1655
1656/*
1657 * send session open request.
1658 *
1659 * called under mdsc->mutex
1660 */
1661static int __open_session(struct ceph_mds_client *mdsc,
1662 struct ceph_mds_session *session)
1663{
1664 struct ceph_msg *msg;
1665 int mstate;
1666 int mds = session->s_mds;
1667
1668 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO)
1669 return -EIO;
1670
1671 /* wait for mds to go active? */
1672 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
1673 doutc(mdsc->fsc->client, "open_session to mds%d (%s)\n", mds,
1674 ceph_mds_state_name(mstate));
1675 session->s_state = CEPH_MDS_SESSION_OPENING;
1676 session->s_renew_requested = jiffies;
1677
1678 /* send connect message */
1679 msg = create_session_full_msg(mdsc, CEPH_SESSION_REQUEST_OPEN,
1680 session->s_seq);
1681 if (IS_ERR(msg))
1682 return PTR_ERR(msg);
1683 ceph_con_send(&session->s_con, msg);
1684 return 0;
1685}
1686
1687/*
1688 * open sessions for any export targets for the given mds
1689 *
1690 * called under mdsc->mutex
1691 */
1692static struct ceph_mds_session *
1693__open_export_target_session(struct ceph_mds_client *mdsc, int target)
1694{
1695 struct ceph_mds_session *session;
1696 int ret;
1697
1698 session = __ceph_lookup_mds_session(mdsc, target);
1699 if (!session) {
1700 session = register_session(mdsc, target);
1701 if (IS_ERR(session))
1702 return session;
1703 }
1704 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1705 session->s_state == CEPH_MDS_SESSION_CLOSING) {
1706 ret = __open_session(mdsc, session);
1707 if (ret)
1708 return ERR_PTR(ret);
1709 }
1710
1711 return session;
1712}
1713
1714struct ceph_mds_session *
1715ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1716{
1717 struct ceph_mds_session *session;
1718 struct ceph_client *cl = mdsc->fsc->client;
1719
1720 doutc(cl, "to mds%d\n", target);
1721
1722 mutex_lock(&mdsc->mutex);
1723 session = __open_export_target_session(mdsc, target);
1724 mutex_unlock(&mdsc->mutex);
1725
1726 return session;
1727}
1728
1729static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1730 struct ceph_mds_session *session)
1731{
1732 struct ceph_mds_info *mi;
1733 struct ceph_mds_session *ts;
1734 int i, mds = session->s_mds;
1735 struct ceph_client *cl = mdsc->fsc->client;
1736
1737 if (mds >= mdsc->mdsmap->possible_max_rank)
1738 return;
1739
1740 mi = &mdsc->mdsmap->m_info[mds];
1741 doutc(cl, "for mds%d (%d targets)\n", session->s_mds,
1742 mi->num_export_targets);
1743
1744 for (i = 0; i < mi->num_export_targets; i++) {
1745 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1746 ceph_put_mds_session(ts);
1747 }
1748}
1749
1750void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1751 struct ceph_mds_session *session)
1752{
1753 mutex_lock(&mdsc->mutex);
1754 __open_export_target_sessions(mdsc, session);
1755 mutex_unlock(&mdsc->mutex);
1756}
1757
1758/*
1759 * session caps
1760 */
1761
1762static void detach_cap_releases(struct ceph_mds_session *session,
1763 struct list_head *target)
1764{
1765 struct ceph_client *cl = session->s_mdsc->fsc->client;
1766
1767 lockdep_assert_held(&session->s_cap_lock);
1768
1769 list_splice_init(&session->s_cap_releases, target);
1770 session->s_num_cap_releases = 0;
1771 doutc(cl, "mds%d\n", session->s_mds);
1772}
1773
1774static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1775 struct list_head *dispose)
1776{
1777 while (!list_empty(dispose)) {
1778 struct ceph_cap *cap;
1779 /* zero out the in-progress message */
1780 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
1781 list_del(&cap->session_caps);
1782 ceph_put_cap(mdsc, cap);
1783 }
1784}
1785
1786static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1787 struct ceph_mds_session *session)
1788{
1789 struct ceph_client *cl = mdsc->fsc->client;
1790 struct ceph_mds_request *req;
1791 struct rb_node *p;
1792
1793 doutc(cl, "mds%d\n", session->s_mds);
1794 mutex_lock(&mdsc->mutex);
1795 while (!list_empty(&session->s_unsafe)) {
1796 req = list_first_entry(&session->s_unsafe,
1797 struct ceph_mds_request, r_unsafe_item);
1798 pr_warn_ratelimited_client(cl, " dropping unsafe request %llu\n",
1799 req->r_tid);
1800 if (req->r_target_inode)
1801 mapping_set_error(req->r_target_inode->i_mapping, -EIO);
1802 if (req->r_unsafe_dir)
1803 mapping_set_error(req->r_unsafe_dir->i_mapping, -EIO);
1804 __unregister_request(mdsc, req);
1805 }
1806 /* zero r_attempts, so kick_requests() will re-send requests */
1807 p = rb_first(&mdsc->request_tree);
1808 while (p) {
1809 req = rb_entry(p, struct ceph_mds_request, r_node);
1810 p = rb_next(p);
1811 if (req->r_session &&
1812 req->r_session->s_mds == session->s_mds)
1813 req->r_attempts = 0;
1814 }
1815 mutex_unlock(&mdsc->mutex);
1816}
1817
1818/*
1819 * Helper to safely iterate over all caps associated with a session, with
1820 * special care taken to handle a racing __ceph_remove_cap().
1821 *
1822 * Caller must hold session s_mutex.
1823 */
1824int ceph_iterate_session_caps(struct ceph_mds_session *session,
1825 int (*cb)(struct inode *, int mds, void *),
1826 void *arg)
1827{
1828 struct ceph_client *cl = session->s_mdsc->fsc->client;
1829 struct list_head *p;
1830 struct ceph_cap *cap;
1831 struct inode *inode, *last_inode = NULL;
1832 struct ceph_cap *old_cap = NULL;
1833 int ret;
1834
1835 doutc(cl, "%p mds%d\n", session, session->s_mds);
1836 spin_lock(&session->s_cap_lock);
1837 p = session->s_caps.next;
1838 while (p != &session->s_caps) {
1839 int mds;
1840
1841 cap = list_entry(p, struct ceph_cap, session_caps);
1842 inode = igrab(&cap->ci->netfs.inode);
1843 if (!inode) {
1844 p = p->next;
1845 continue;
1846 }
1847 session->s_cap_iterator = cap;
1848 mds = cap->mds;
1849 spin_unlock(&session->s_cap_lock);
1850
1851 if (last_inode) {
1852 iput(last_inode);
1853 last_inode = NULL;
1854 }
1855 if (old_cap) {
1856 ceph_put_cap(session->s_mdsc, old_cap);
1857 old_cap = NULL;
1858 }
1859
1860 ret = cb(inode, mds, arg);
1861 last_inode = inode;
1862
1863 spin_lock(&session->s_cap_lock);
1864 p = p->next;
1865 if (!cap->ci) {
1866 doutc(cl, "finishing cap %p removal\n", cap);
1867 BUG_ON(cap->session != session);
1868 cap->session = NULL;
1869 list_del_init(&cap->session_caps);
1870 session->s_nr_caps--;
1871 atomic64_dec(&session->s_mdsc->metric.total_caps);
1872 if (cap->queue_release)
1873 __ceph_queue_cap_release(session, cap);
1874 else
1875 old_cap = cap; /* put_cap it w/o locks held */
1876 }
1877 if (ret < 0)
1878 goto out;
1879 }
1880 ret = 0;
1881out:
1882 session->s_cap_iterator = NULL;
1883 spin_unlock(&session->s_cap_lock);
1884
1885 iput(last_inode);
1886 if (old_cap)
1887 ceph_put_cap(session->s_mdsc, old_cap);
1888
1889 return ret;
1890}
1891
1892static int remove_session_caps_cb(struct inode *inode, int mds, void *arg)
1893{
1894 struct ceph_inode_info *ci = ceph_inode(inode);
1895 struct ceph_client *cl = ceph_inode_to_client(inode);
1896 bool invalidate = false;
1897 struct ceph_cap *cap;
1898 int iputs = 0;
1899
1900 spin_lock(&ci->i_ceph_lock);
1901 cap = __get_cap_for_mds(ci, mds);
1902 if (cap) {
1903 doutc(cl, " removing cap %p, ci is %p, inode is %p\n",
1904 cap, ci, &ci->netfs.inode);
1905
1906 iputs = ceph_purge_inode_cap(inode, cap, &invalidate);
1907 }
1908 spin_unlock(&ci->i_ceph_lock);
1909
1910 if (cap)
1911 wake_up_all(&ci->i_cap_wq);
1912 if (invalidate)
1913 ceph_queue_invalidate(inode);
1914 while (iputs--)
1915 iput(inode);
1916 return 0;
1917}
1918
1919/*
1920 * caller must hold session s_mutex
1921 */
1922static void remove_session_caps(struct ceph_mds_session *session)
1923{
1924 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1925 struct super_block *sb = fsc->sb;
1926 LIST_HEAD(dispose);
1927
1928 doutc(fsc->client, "on %p\n", session);
1929 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
1930
1931 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1932
1933 spin_lock(&session->s_cap_lock);
1934 if (session->s_nr_caps > 0) {
1935 struct inode *inode;
1936 struct ceph_cap *cap, *prev = NULL;
1937 struct ceph_vino vino;
1938 /*
1939 * iterate_session_caps() skips inodes that are being
1940 * deleted, we need to wait until deletions are complete.
1941 * __wait_on_freeing_inode() is designed for the job,
1942 * but it is not exported, so use lookup inode function
1943 * to access it.
1944 */
1945 while (!list_empty(&session->s_caps)) {
1946 cap = list_entry(session->s_caps.next,
1947 struct ceph_cap, session_caps);
1948 if (cap == prev)
1949 break;
1950 prev = cap;
1951 vino = cap->ci->i_vino;
1952 spin_unlock(&session->s_cap_lock);
1953
1954 inode = ceph_find_inode(sb, vino);
1955 iput(inode);
1956
1957 spin_lock(&session->s_cap_lock);
1958 }
1959 }
1960
1961 // drop cap expires and unlock s_cap_lock
1962 detach_cap_releases(session, &dispose);
1963
1964 BUG_ON(session->s_nr_caps > 0);
1965 BUG_ON(!list_empty(&session->s_cap_flushing));
1966 spin_unlock(&session->s_cap_lock);
1967 dispose_cap_releases(session->s_mdsc, &dispose);
1968}
1969
1970enum {
1971 RECONNECT,
1972 RENEWCAPS,
1973 FORCE_RO,
1974};
1975
1976/*
1977 * wake up any threads waiting on this session's caps. if the cap is
1978 * old (didn't get renewed on the client reconnect), remove it now.
1979 *
1980 * caller must hold s_mutex.
1981 */
1982static int wake_up_session_cb(struct inode *inode, int mds, void *arg)
1983{
1984 struct ceph_inode_info *ci = ceph_inode(inode);
1985 unsigned long ev = (unsigned long)arg;
1986
1987 if (ev == RECONNECT) {
1988 spin_lock(&ci->i_ceph_lock);
1989 ci->i_wanted_max_size = 0;
1990 ci->i_requested_max_size = 0;
1991 spin_unlock(&ci->i_ceph_lock);
1992 } else if (ev == RENEWCAPS) {
1993 struct ceph_cap *cap;
1994
1995 spin_lock(&ci->i_ceph_lock);
1996 cap = __get_cap_for_mds(ci, mds);
1997 /* mds did not re-issue stale cap */
1998 if (cap && cap->cap_gen < atomic_read(&cap->session->s_cap_gen))
1999 cap->issued = cap->implemented = CEPH_CAP_PIN;
2000 spin_unlock(&ci->i_ceph_lock);
2001 } else if (ev == FORCE_RO) {
2002 }
2003 wake_up_all(&ci->i_cap_wq);
2004 return 0;
2005}
2006
2007static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
2008{
2009 struct ceph_client *cl = session->s_mdsc->fsc->client;
2010
2011 doutc(cl, "session %p mds%d\n", session, session->s_mds);
2012 ceph_iterate_session_caps(session, wake_up_session_cb,
2013 (void *)(unsigned long)ev);
2014}
2015
2016/*
2017 * Send periodic message to MDS renewing all currently held caps. The
2018 * ack will reset the expiration for all caps from this session.
2019 *
2020 * caller holds s_mutex
2021 */
2022static int send_renew_caps(struct ceph_mds_client *mdsc,
2023 struct ceph_mds_session *session)
2024{
2025 struct ceph_client *cl = mdsc->fsc->client;
2026 struct ceph_msg *msg;
2027 int state;
2028
2029 if (time_after_eq(jiffies, session->s_cap_ttl) &&
2030 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
2031 pr_info_client(cl, "mds%d caps stale\n", session->s_mds);
2032 session->s_renew_requested = jiffies;
2033
2034 /* do not try to renew caps until a recovering mds has reconnected
2035 * with its clients. */
2036 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
2037 if (state < CEPH_MDS_STATE_RECONNECT) {
2038 doutc(cl, "ignoring mds%d (%s)\n", session->s_mds,
2039 ceph_mds_state_name(state));
2040 return 0;
2041 }
2042
2043 doutc(cl, "to mds%d (%s)\n", session->s_mds,
2044 ceph_mds_state_name(state));
2045 msg = create_session_full_msg(mdsc, CEPH_SESSION_REQUEST_RENEWCAPS,
2046 ++session->s_renew_seq);
2047 if (IS_ERR(msg))
2048 return PTR_ERR(msg);
2049 ceph_con_send(&session->s_con, msg);
2050 return 0;
2051}
2052
2053static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
2054 struct ceph_mds_session *session, u64 seq)
2055{
2056 struct ceph_client *cl = mdsc->fsc->client;
2057 struct ceph_msg *msg;
2058
2059 doutc(cl, "to mds%d (%s)s seq %lld\n", session->s_mds,
2060 ceph_session_state_name(session->s_state), seq);
2061 msg = ceph_create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
2062 if (!msg)
2063 return -ENOMEM;
2064 ceph_con_send(&session->s_con, msg);
2065 return 0;
2066}
2067
2068
2069/*
2070 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
2071 *
2072 * Called under session->s_mutex
2073 */
2074static void renewed_caps(struct ceph_mds_client *mdsc,
2075 struct ceph_mds_session *session, int is_renew)
2076{
2077 struct ceph_client *cl = mdsc->fsc->client;
2078 int was_stale;
2079 int wake = 0;
2080
2081 spin_lock(&session->s_cap_lock);
2082 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2083
2084 session->s_cap_ttl = session->s_renew_requested +
2085 mdsc->mdsmap->m_session_timeout*HZ;
2086
2087 if (was_stale) {
2088 if (time_before(jiffies, session->s_cap_ttl)) {
2089 pr_info_client(cl, "mds%d caps renewed\n",
2090 session->s_mds);
2091 wake = 1;
2092 } else {
2093 pr_info_client(cl, "mds%d caps still stale\n",
2094 session->s_mds);
2095 }
2096 }
2097 doutc(cl, "mds%d ttl now %lu, was %s, now %s\n", session->s_mds,
2098 session->s_cap_ttl, was_stale ? "stale" : "fresh",
2099 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
2100 spin_unlock(&session->s_cap_lock);
2101
2102 if (wake)
2103 wake_up_session_caps(session, RENEWCAPS);
2104}
2105
2106/*
2107 * send a session close request
2108 */
2109static int request_close_session(struct ceph_mds_session *session)
2110{
2111 struct ceph_client *cl = session->s_mdsc->fsc->client;
2112 struct ceph_msg *msg;
2113
2114 doutc(cl, "mds%d state %s seq %lld\n", session->s_mds,
2115 ceph_session_state_name(session->s_state), session->s_seq);
2116 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_CLOSE,
2117 session->s_seq);
2118 if (!msg)
2119 return -ENOMEM;
2120 ceph_con_send(&session->s_con, msg);
2121 return 1;
2122}
2123
2124/*
2125 * Called with s_mutex held.
2126 */
2127static int __close_session(struct ceph_mds_client *mdsc,
2128 struct ceph_mds_session *session)
2129{
2130 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
2131 return 0;
2132 session->s_state = CEPH_MDS_SESSION_CLOSING;
2133 return request_close_session(session);
2134}
2135
2136static bool drop_negative_children(struct dentry *dentry)
2137{
2138 struct dentry *child;
2139 bool all_negative = true;
2140
2141 if (!d_is_dir(dentry))
2142 goto out;
2143
2144 spin_lock(&dentry->d_lock);
2145 hlist_for_each_entry(child, &dentry->d_children, d_sib) {
2146 if (d_really_is_positive(child)) {
2147 all_negative = false;
2148 break;
2149 }
2150 }
2151 spin_unlock(&dentry->d_lock);
2152
2153 if (all_negative)
2154 shrink_dcache_parent(dentry);
2155out:
2156 return all_negative;
2157}
2158
2159/*
2160 * Trim old(er) caps.
2161 *
2162 * Because we can't cache an inode without one or more caps, we do
2163 * this indirectly: if a cap is unused, we prune its aliases, at which
2164 * point the inode will hopefully get dropped to.
2165 *
2166 * Yes, this is a bit sloppy. Our only real goal here is to respond to
2167 * memory pressure from the MDS, though, so it needn't be perfect.
2168 */
2169static int trim_caps_cb(struct inode *inode, int mds, void *arg)
2170{
2171 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
2172 struct ceph_client *cl = mdsc->fsc->client;
2173 int *remaining = arg;
2174 struct ceph_inode_info *ci = ceph_inode(inode);
2175 int used, wanted, oissued, mine;
2176 struct ceph_cap *cap;
2177
2178 if (*remaining <= 0)
2179 return -1;
2180
2181 spin_lock(&ci->i_ceph_lock);
2182 cap = __get_cap_for_mds(ci, mds);
2183 if (!cap) {
2184 spin_unlock(&ci->i_ceph_lock);
2185 return 0;
2186 }
2187 mine = cap->issued | cap->implemented;
2188 used = __ceph_caps_used(ci);
2189 wanted = __ceph_caps_file_wanted(ci);
2190 oissued = __ceph_caps_issued_other(ci, cap);
2191
2192 doutc(cl, "%p %llx.%llx cap %p mine %s oissued %s used %s wanted %s\n",
2193 inode, ceph_vinop(inode), cap, ceph_cap_string(mine),
2194 ceph_cap_string(oissued), ceph_cap_string(used),
2195 ceph_cap_string(wanted));
2196 if (cap == ci->i_auth_cap) {
2197 if (ci->i_dirty_caps || ci->i_flushing_caps ||
2198 !list_empty(&ci->i_cap_snaps))
2199 goto out;
2200 if ((used | wanted) & CEPH_CAP_ANY_WR)
2201 goto out;
2202 /* Note: it's possible that i_filelock_ref becomes non-zero
2203 * after dropping auth caps. It doesn't hurt because reply
2204 * of lock mds request will re-add auth caps. */
2205 if (atomic_read(&ci->i_filelock_ref) > 0)
2206 goto out;
2207 }
2208 /* The inode has cached pages, but it's no longer used.
2209 * we can safely drop it */
2210 if (S_ISREG(inode->i_mode) &&
2211 wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
2212 !(oissued & CEPH_CAP_FILE_CACHE)) {
2213 used = 0;
2214 oissued = 0;
2215 }
2216 if ((used | wanted) & ~oissued & mine)
2217 goto out; /* we need these caps */
2218
2219 if (oissued) {
2220 /* we aren't the only cap.. just remove us */
2221 ceph_remove_cap(mdsc, cap, true);
2222 (*remaining)--;
2223 } else {
2224 struct dentry *dentry;
2225 /* try dropping referring dentries */
2226 spin_unlock(&ci->i_ceph_lock);
2227 dentry = d_find_any_alias(inode);
2228 if (dentry && drop_negative_children(dentry)) {
2229 int count;
2230 dput(dentry);
2231 d_prune_aliases(inode);
2232 count = atomic_read(&inode->i_count);
2233 if (count == 1)
2234 (*remaining)--;
2235 doutc(cl, "%p %llx.%llx cap %p pruned, count now %d\n",
2236 inode, ceph_vinop(inode), cap, count);
2237 } else {
2238 dput(dentry);
2239 }
2240 return 0;
2241 }
2242
2243out:
2244 spin_unlock(&ci->i_ceph_lock);
2245 return 0;
2246}
2247
2248/*
2249 * Trim session cap count down to some max number.
2250 */
2251int ceph_trim_caps(struct ceph_mds_client *mdsc,
2252 struct ceph_mds_session *session,
2253 int max_caps)
2254{
2255 struct ceph_client *cl = mdsc->fsc->client;
2256 int trim_caps = session->s_nr_caps - max_caps;
2257
2258 doutc(cl, "mds%d start: %d / %d, trim %d\n", session->s_mds,
2259 session->s_nr_caps, max_caps, trim_caps);
2260 if (trim_caps > 0) {
2261 int remaining = trim_caps;
2262
2263 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
2264 doutc(cl, "mds%d done: %d / %d, trimmed %d\n",
2265 session->s_mds, session->s_nr_caps, max_caps,
2266 trim_caps - remaining);
2267 }
2268
2269 ceph_flush_cap_releases(mdsc, session);
2270 return 0;
2271}
2272
2273static int check_caps_flush(struct ceph_mds_client *mdsc,
2274 u64 want_flush_tid)
2275{
2276 struct ceph_client *cl = mdsc->fsc->client;
2277 int ret = 1;
2278
2279 spin_lock(&mdsc->cap_dirty_lock);
2280 if (!list_empty(&mdsc->cap_flush_list)) {
2281 struct ceph_cap_flush *cf =
2282 list_first_entry(&mdsc->cap_flush_list,
2283 struct ceph_cap_flush, g_list);
2284 if (cf->tid <= want_flush_tid) {
2285 doutc(cl, "still flushing tid %llu <= %llu\n",
2286 cf->tid, want_flush_tid);
2287 ret = 0;
2288 }
2289 }
2290 spin_unlock(&mdsc->cap_dirty_lock);
2291 return ret;
2292}
2293
2294/*
2295 * flush all dirty inode data to disk.
2296 *
2297 * returns true if we've flushed through want_flush_tid
2298 */
2299static void wait_caps_flush(struct ceph_mds_client *mdsc,
2300 u64 want_flush_tid)
2301{
2302 struct ceph_client *cl = mdsc->fsc->client;
2303
2304 doutc(cl, "want %llu\n", want_flush_tid);
2305
2306 wait_event(mdsc->cap_flushing_wq,
2307 check_caps_flush(mdsc, want_flush_tid));
2308
2309 doutc(cl, "ok, flushed thru %llu\n", want_flush_tid);
2310}
2311
2312/*
2313 * called under s_mutex
2314 */
2315static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
2316 struct ceph_mds_session *session)
2317{
2318 struct ceph_client *cl = mdsc->fsc->client;
2319 struct ceph_msg *msg = NULL;
2320 struct ceph_mds_cap_release *head;
2321 struct ceph_mds_cap_item *item;
2322 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
2323 struct ceph_cap *cap;
2324 LIST_HEAD(tmp_list);
2325 int num_cap_releases;
2326 __le32 barrier, *cap_barrier;
2327
2328 down_read(&osdc->lock);
2329 barrier = cpu_to_le32(osdc->epoch_barrier);
2330 up_read(&osdc->lock);
2331
2332 spin_lock(&session->s_cap_lock);
2333again:
2334 list_splice_init(&session->s_cap_releases, &tmp_list);
2335 num_cap_releases = session->s_num_cap_releases;
2336 session->s_num_cap_releases = 0;
2337 spin_unlock(&session->s_cap_lock);
2338
2339 while (!list_empty(&tmp_list)) {
2340 if (!msg) {
2341 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
2342 PAGE_SIZE, GFP_NOFS, false);
2343 if (!msg)
2344 goto out_err;
2345 head = msg->front.iov_base;
2346 head->num = cpu_to_le32(0);
2347 msg->front.iov_len = sizeof(*head);
2348
2349 msg->hdr.version = cpu_to_le16(2);
2350 msg->hdr.compat_version = cpu_to_le16(1);
2351 }
2352
2353 cap = list_first_entry(&tmp_list, struct ceph_cap,
2354 session_caps);
2355 list_del(&cap->session_caps);
2356 num_cap_releases--;
2357
2358 head = msg->front.iov_base;
2359 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
2360 &head->num);
2361 item = msg->front.iov_base + msg->front.iov_len;
2362 item->ino = cpu_to_le64(cap->cap_ino);
2363 item->cap_id = cpu_to_le64(cap->cap_id);
2364 item->migrate_seq = cpu_to_le32(cap->mseq);
2365 item->seq = cpu_to_le32(cap->issue_seq);
2366 msg->front.iov_len += sizeof(*item);
2367
2368 ceph_put_cap(mdsc, cap);
2369
2370 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
2371 // Append cap_barrier field
2372 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2373 *cap_barrier = barrier;
2374 msg->front.iov_len += sizeof(*cap_barrier);
2375
2376 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2377 doutc(cl, "mds%d %p\n", session->s_mds, msg);
2378 ceph_con_send(&session->s_con, msg);
2379 msg = NULL;
2380 }
2381 }
2382
2383 BUG_ON(num_cap_releases != 0);
2384
2385 spin_lock(&session->s_cap_lock);
2386 if (!list_empty(&session->s_cap_releases))
2387 goto again;
2388 spin_unlock(&session->s_cap_lock);
2389
2390 if (msg) {
2391 // Append cap_barrier field
2392 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2393 *cap_barrier = barrier;
2394 msg->front.iov_len += sizeof(*cap_barrier);
2395
2396 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2397 doutc(cl, "mds%d %p\n", session->s_mds, msg);
2398 ceph_con_send(&session->s_con, msg);
2399 }
2400 return;
2401out_err:
2402 pr_err_client(cl, "mds%d, failed to allocate message\n",
2403 session->s_mds);
2404 spin_lock(&session->s_cap_lock);
2405 list_splice(&tmp_list, &session->s_cap_releases);
2406 session->s_num_cap_releases += num_cap_releases;
2407 spin_unlock(&session->s_cap_lock);
2408}
2409
2410static void ceph_cap_release_work(struct work_struct *work)
2411{
2412 struct ceph_mds_session *session =
2413 container_of(work, struct ceph_mds_session, s_cap_release_work);
2414
2415 mutex_lock(&session->s_mutex);
2416 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
2417 session->s_state == CEPH_MDS_SESSION_HUNG)
2418 ceph_send_cap_releases(session->s_mdsc, session);
2419 mutex_unlock(&session->s_mutex);
2420 ceph_put_mds_session(session);
2421}
2422
2423void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
2424 struct ceph_mds_session *session)
2425{
2426 struct ceph_client *cl = mdsc->fsc->client;
2427 if (mdsc->stopping)
2428 return;
2429
2430 ceph_get_mds_session(session);
2431 if (queue_work(mdsc->fsc->cap_wq,
2432 &session->s_cap_release_work)) {
2433 doutc(cl, "cap release work queued\n");
2434 } else {
2435 ceph_put_mds_session(session);
2436 doutc(cl, "failed to queue cap release work\n");
2437 }
2438}
2439
2440/*
2441 * caller holds session->s_cap_lock
2442 */
2443void __ceph_queue_cap_release(struct ceph_mds_session *session,
2444 struct ceph_cap *cap)
2445{
2446 list_add_tail(&cap->session_caps, &session->s_cap_releases);
2447 session->s_num_cap_releases++;
2448
2449 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
2450 ceph_flush_cap_releases(session->s_mdsc, session);
2451}
2452
2453static void ceph_cap_reclaim_work(struct work_struct *work)
2454{
2455 struct ceph_mds_client *mdsc =
2456 container_of(work, struct ceph_mds_client, cap_reclaim_work);
2457 int ret = ceph_trim_dentries(mdsc);
2458 if (ret == -EAGAIN)
2459 ceph_queue_cap_reclaim_work(mdsc);
2460}
2461
2462void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2463{
2464 struct ceph_client *cl = mdsc->fsc->client;
2465 if (mdsc->stopping)
2466 return;
2467
2468 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
2469 doutc(cl, "caps reclaim work queued\n");
2470 } else {
2471 doutc(cl, "failed to queue caps release work\n");
2472 }
2473}
2474
2475void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2476{
2477 int val;
2478 if (!nr)
2479 return;
2480 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
2481 if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
2482 atomic_set(&mdsc->cap_reclaim_pending, 0);
2483 ceph_queue_cap_reclaim_work(mdsc);
2484 }
2485}
2486
2487void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc)
2488{
2489 struct ceph_client *cl = mdsc->fsc->client;
2490 if (mdsc->stopping)
2491 return;
2492
2493 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_unlink_work)) {
2494 doutc(cl, "caps unlink work queued\n");
2495 } else {
2496 doutc(cl, "failed to queue caps unlink work\n");
2497 }
2498}
2499
2500static void ceph_cap_unlink_work(struct work_struct *work)
2501{
2502 struct ceph_mds_client *mdsc =
2503 container_of(work, struct ceph_mds_client, cap_unlink_work);
2504 struct ceph_client *cl = mdsc->fsc->client;
2505
2506 doutc(cl, "begin\n");
2507 spin_lock(&mdsc->cap_delay_lock);
2508 while (!list_empty(&mdsc->cap_unlink_delay_list)) {
2509 struct ceph_inode_info *ci;
2510 struct inode *inode;
2511
2512 ci = list_first_entry(&mdsc->cap_unlink_delay_list,
2513 struct ceph_inode_info,
2514 i_cap_delay_list);
2515 list_del_init(&ci->i_cap_delay_list);
2516
2517 inode = igrab(&ci->netfs.inode);
2518 if (inode) {
2519 spin_unlock(&mdsc->cap_delay_lock);
2520 doutc(cl, "on %p %llx.%llx\n", inode,
2521 ceph_vinop(inode));
2522 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
2523 iput(inode);
2524 spin_lock(&mdsc->cap_delay_lock);
2525 }
2526 }
2527 spin_unlock(&mdsc->cap_delay_lock);
2528 doutc(cl, "done\n");
2529}
2530
2531/*
2532 * requests
2533 */
2534
2535int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2536 struct inode *dir)
2537{
2538 struct ceph_inode_info *ci = ceph_inode(dir);
2539 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2540 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2541 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
2542 unsigned int num_entries;
2543 int order;
2544
2545 spin_lock(&ci->i_ceph_lock);
2546 num_entries = ci->i_files + ci->i_subdirs;
2547 spin_unlock(&ci->i_ceph_lock);
2548 num_entries = max(num_entries, 1U);
2549 num_entries = min(num_entries, opt->max_readdir);
2550
2551 order = get_order(size * num_entries);
2552 while (order >= 0) {
2553 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2554 __GFP_NOWARN |
2555 __GFP_ZERO,
2556 order);
2557 if (rinfo->dir_entries)
2558 break;
2559 order--;
2560 }
2561 if (!rinfo->dir_entries)
2562 return -ENOMEM;
2563
2564 num_entries = (PAGE_SIZE << order) / size;
2565 num_entries = min(num_entries, opt->max_readdir);
2566
2567 rinfo->dir_buf_size = PAGE_SIZE << order;
2568 req->r_num_caps = num_entries + 1;
2569 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2570 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2571 return 0;
2572}
2573
2574/*
2575 * Create an mds request.
2576 */
2577struct ceph_mds_request *
2578ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2579{
2580 struct ceph_mds_request *req;
2581
2582 req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS);
2583 if (!req)
2584 return ERR_PTR(-ENOMEM);
2585
2586 mutex_init(&req->r_fill_mutex);
2587 req->r_mdsc = mdsc;
2588 req->r_started = jiffies;
2589 req->r_start_latency = ktime_get();
2590 req->r_resend_mds = -1;
2591 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
2592 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2593 req->r_fmode = -1;
2594 req->r_feature_needed = -1;
2595 kref_init(&req->r_kref);
2596 RB_CLEAR_NODE(&req->r_node);
2597 INIT_LIST_HEAD(&req->r_wait);
2598 init_completion(&req->r_completion);
2599 init_completion(&req->r_safe_completion);
2600 INIT_LIST_HEAD(&req->r_unsafe_item);
2601
2602 ktime_get_coarse_real_ts64(&req->r_stamp);
2603
2604 req->r_op = op;
2605 req->r_direct_mode = mode;
2606 return req;
2607}
2608
2609/*
2610 * return oldest (lowest) request, tid in request tree, 0 if none.
2611 *
2612 * called under mdsc->mutex.
2613 */
2614static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2615{
2616 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2617 return NULL;
2618 return rb_entry(rb_first(&mdsc->request_tree),
2619 struct ceph_mds_request, r_node);
2620}
2621
2622static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2623{
2624 return mdsc->oldest_tid;
2625}
2626
2627#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
2628static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen)
2629{
2630 struct inode *dir = req->r_parent;
2631 struct dentry *dentry = req->r_dentry;
2632 u8 *cryptbuf = NULL;
2633 u32 len = 0;
2634 int ret = 0;
2635
2636 /* only encode if we have parent and dentry */
2637 if (!dir || !dentry)
2638 goto success;
2639
2640 /* No-op unless this is encrypted */
2641 if (!IS_ENCRYPTED(dir))
2642 goto success;
2643
2644 ret = ceph_fscrypt_prepare_readdir(dir);
2645 if (ret < 0)
2646 return ERR_PTR(ret);
2647
2648 /* No key? Just ignore it. */
2649 if (!fscrypt_has_encryption_key(dir))
2650 goto success;
2651
2652 if (!fscrypt_fname_encrypted_size(dir, dentry->d_name.len, NAME_MAX,
2653 &len)) {
2654 WARN_ON_ONCE(1);
2655 return ERR_PTR(-ENAMETOOLONG);
2656 }
2657
2658 /* No need to append altname if name is short enough */
2659 if (len <= CEPH_NOHASH_NAME_MAX) {
2660 len = 0;
2661 goto success;
2662 }
2663
2664 cryptbuf = kmalloc(len, GFP_KERNEL);
2665 if (!cryptbuf)
2666 return ERR_PTR(-ENOMEM);
2667
2668 ret = fscrypt_fname_encrypt(dir, &dentry->d_name, cryptbuf, len);
2669 if (ret) {
2670 kfree(cryptbuf);
2671 return ERR_PTR(ret);
2672 }
2673success:
2674 *plen = len;
2675 return cryptbuf;
2676}
2677#else
2678static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen)
2679{
2680 *plen = 0;
2681 return NULL;
2682}
2683#endif
2684
2685/**
2686 * ceph_mdsc_build_path - build a path string to a given dentry
2687 * @mdsc: mds client
2688 * @dentry: dentry to which path should be built
2689 * @plen: returned length of string
2690 * @pbase: returned base inode number
2691 * @for_wire: is this path going to be sent to the MDS?
2692 *
2693 * Build a string that represents the path to the dentry. This is mostly called
2694 * for two different purposes:
2695 *
2696 * 1) we need to build a path string to send to the MDS (for_wire == true)
2697 * 2) we need a path string for local presentation (e.g. debugfs)
2698 * (for_wire == false)
2699 *
2700 * The path is built in reverse, starting with the dentry. Walk back up toward
2701 * the root, building the path until the first non-snapped inode is reached
2702 * (for_wire) or the root inode is reached (!for_wire).
2703 *
2704 * Encode hidden .snap dirs as a double /, i.e.
2705 * foo/.snap/bar -> foo//bar
2706 */
2707char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc, struct dentry *dentry,
2708 int *plen, u64 *pbase, int for_wire)
2709{
2710 struct ceph_client *cl = mdsc->fsc->client;
2711 struct dentry *cur;
2712 struct inode *inode;
2713 char *path;
2714 int pos;
2715 unsigned seq;
2716 u64 base;
2717
2718 if (!dentry)
2719 return ERR_PTR(-EINVAL);
2720
2721 path = __getname();
2722 if (!path)
2723 return ERR_PTR(-ENOMEM);
2724retry:
2725 pos = PATH_MAX - 1;
2726 path[pos] = '\0';
2727
2728 seq = read_seqbegin(&rename_lock);
2729 cur = dget(dentry);
2730 for (;;) {
2731 struct dentry *parent;
2732
2733 spin_lock(&cur->d_lock);
2734 inode = d_inode(cur);
2735 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
2736 doutc(cl, "path+%d: %p SNAPDIR\n", pos, cur);
2737 spin_unlock(&cur->d_lock);
2738 parent = dget_parent(cur);
2739 } else if (for_wire && inode && dentry != cur &&
2740 ceph_snap(inode) == CEPH_NOSNAP) {
2741 spin_unlock(&cur->d_lock);
2742 pos++; /* get rid of any prepended '/' */
2743 break;
2744 } else if (!for_wire || !IS_ENCRYPTED(d_inode(cur->d_parent))) {
2745 pos -= cur->d_name.len;
2746 if (pos < 0) {
2747 spin_unlock(&cur->d_lock);
2748 break;
2749 }
2750 memcpy(path + pos, cur->d_name.name, cur->d_name.len);
2751 spin_unlock(&cur->d_lock);
2752 parent = dget_parent(cur);
2753 } else {
2754 int len, ret;
2755 char buf[NAME_MAX];
2756
2757 /*
2758 * Proactively copy name into buf, in case we need to
2759 * present it as-is.
2760 */
2761 memcpy(buf, cur->d_name.name, cur->d_name.len);
2762 len = cur->d_name.len;
2763 spin_unlock(&cur->d_lock);
2764 parent = dget_parent(cur);
2765
2766 ret = ceph_fscrypt_prepare_readdir(d_inode(parent));
2767 if (ret < 0) {
2768 dput(parent);
2769 dput(cur);
2770 return ERR_PTR(ret);
2771 }
2772
2773 if (fscrypt_has_encryption_key(d_inode(parent))) {
2774 len = ceph_encode_encrypted_fname(d_inode(parent),
2775 cur, buf);
2776 if (len < 0) {
2777 dput(parent);
2778 dput(cur);
2779 return ERR_PTR(len);
2780 }
2781 }
2782 pos -= len;
2783 if (pos < 0) {
2784 dput(parent);
2785 break;
2786 }
2787 memcpy(path + pos, buf, len);
2788 }
2789 dput(cur);
2790 cur = parent;
2791
2792 /* Are we at the root? */
2793 if (IS_ROOT(cur))
2794 break;
2795
2796 /* Are we out of buffer? */
2797 if (--pos < 0)
2798 break;
2799
2800 path[pos] = '/';
2801 }
2802 inode = d_inode(cur);
2803 base = inode ? ceph_ino(inode) : 0;
2804 dput(cur);
2805
2806 if (read_seqretry(&rename_lock, seq))
2807 goto retry;
2808
2809 if (pos < 0) {
2810 /*
2811 * A rename didn't occur, but somehow we didn't end up where
2812 * we thought we would. Throw a warning and try again.
2813 */
2814 pr_warn_client(cl, "did not end path lookup where expected (pos = %d)\n",
2815 pos);
2816 goto retry;
2817 }
2818
2819 *pbase = base;
2820 *plen = PATH_MAX - 1 - pos;
2821 doutc(cl, "on %p %d built %llx '%.*s'\n", dentry, d_count(dentry),
2822 base, *plen, path + pos);
2823 return path + pos;
2824}
2825
2826static int build_dentry_path(struct ceph_mds_client *mdsc, struct dentry *dentry,
2827 struct inode *dir, const char **ppath, int *ppathlen,
2828 u64 *pino, bool *pfreepath, bool parent_locked)
2829{
2830 char *path;
2831
2832 rcu_read_lock();
2833 if (!dir)
2834 dir = d_inode_rcu(dentry->d_parent);
2835 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP &&
2836 !IS_ENCRYPTED(dir)) {
2837 *pino = ceph_ino(dir);
2838 rcu_read_unlock();
2839 *ppath = dentry->d_name.name;
2840 *ppathlen = dentry->d_name.len;
2841 return 0;
2842 }
2843 rcu_read_unlock();
2844 path = ceph_mdsc_build_path(mdsc, dentry, ppathlen, pino, 1);
2845 if (IS_ERR(path))
2846 return PTR_ERR(path);
2847 *ppath = path;
2848 *pfreepath = true;
2849 return 0;
2850}
2851
2852static int build_inode_path(struct inode *inode,
2853 const char **ppath, int *ppathlen, u64 *pino,
2854 bool *pfreepath)
2855{
2856 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
2857 struct dentry *dentry;
2858 char *path;
2859
2860 if (ceph_snap(inode) == CEPH_NOSNAP) {
2861 *pino = ceph_ino(inode);
2862 *ppathlen = 0;
2863 return 0;
2864 }
2865 dentry = d_find_alias(inode);
2866 path = ceph_mdsc_build_path(mdsc, dentry, ppathlen, pino, 1);
2867 dput(dentry);
2868 if (IS_ERR(path))
2869 return PTR_ERR(path);
2870 *ppath = path;
2871 *pfreepath = true;
2872 return 0;
2873}
2874
2875/*
2876 * request arguments may be specified via an inode *, a dentry *, or
2877 * an explicit ino+path.
2878 */
2879static int set_request_path_attr(struct ceph_mds_client *mdsc, struct inode *rinode,
2880 struct dentry *rdentry, struct inode *rdiri,
2881 const char *rpath, u64 rino, const char **ppath,
2882 int *pathlen, u64 *ino, bool *freepath,
2883 bool parent_locked)
2884{
2885 struct ceph_client *cl = mdsc->fsc->client;
2886 int r = 0;
2887
2888 if (rinode) {
2889 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2890 doutc(cl, " inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2891 ceph_snap(rinode));
2892 } else if (rdentry) {
2893 r = build_dentry_path(mdsc, rdentry, rdiri, ppath, pathlen, ino,
2894 freepath, parent_locked);
2895 doutc(cl, " dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, *ppath);
2896 } else if (rpath || rino) {
2897 *ino = rino;
2898 *ppath = rpath;
2899 *pathlen = rpath ? strlen(rpath) : 0;
2900 doutc(cl, " path %.*s\n", *pathlen, rpath);
2901 }
2902
2903 return r;
2904}
2905
2906static void encode_mclientrequest_tail(void **p,
2907 const struct ceph_mds_request *req)
2908{
2909 struct ceph_timespec ts;
2910 int i;
2911
2912 ceph_encode_timespec64(&ts, &req->r_stamp);
2913 ceph_encode_copy(p, &ts, sizeof(ts));
2914
2915 /* v4: gid_list */
2916 ceph_encode_32(p, req->r_cred->group_info->ngroups);
2917 for (i = 0; i < req->r_cred->group_info->ngroups; i++)
2918 ceph_encode_64(p, from_kgid(&init_user_ns,
2919 req->r_cred->group_info->gid[i]));
2920
2921 /* v5: altname */
2922 ceph_encode_32(p, req->r_altname_len);
2923 ceph_encode_copy(p, req->r_altname, req->r_altname_len);
2924
2925 /* v6: fscrypt_auth and fscrypt_file */
2926 if (req->r_fscrypt_auth) {
2927 u32 authlen = ceph_fscrypt_auth_len(req->r_fscrypt_auth);
2928
2929 ceph_encode_32(p, authlen);
2930 ceph_encode_copy(p, req->r_fscrypt_auth, authlen);
2931 } else {
2932 ceph_encode_32(p, 0);
2933 }
2934 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags)) {
2935 ceph_encode_32(p, sizeof(__le64));
2936 ceph_encode_64(p, req->r_fscrypt_file);
2937 } else {
2938 ceph_encode_32(p, 0);
2939 }
2940}
2941
2942static inline u16 mds_supported_head_version(struct ceph_mds_session *session)
2943{
2944 if (!test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD, &session->s_features))
2945 return 1;
2946
2947 if (!test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features))
2948 return 2;
2949
2950 return CEPH_MDS_REQUEST_HEAD_VERSION;
2951}
2952
2953static struct ceph_mds_request_head_legacy *
2954find_legacy_request_head(void *p, u64 features)
2955{
2956 bool legacy = !(features & CEPH_FEATURE_FS_BTIME);
2957 struct ceph_mds_request_head_old *ohead;
2958
2959 if (legacy)
2960 return (struct ceph_mds_request_head_legacy *)p;
2961 ohead = (struct ceph_mds_request_head_old *)p;
2962 return (struct ceph_mds_request_head_legacy *)&ohead->oldest_client_tid;
2963}
2964
2965/*
2966 * called under mdsc->mutex
2967 */
2968static struct ceph_msg *create_request_message(struct ceph_mds_session *session,
2969 struct ceph_mds_request *req,
2970 bool drop_cap_releases)
2971{
2972 int mds = session->s_mds;
2973 struct ceph_mds_client *mdsc = session->s_mdsc;
2974 struct ceph_client *cl = mdsc->fsc->client;
2975 struct ceph_msg *msg;
2976 struct ceph_mds_request_head_legacy *lhead;
2977 const char *path1 = NULL;
2978 const char *path2 = NULL;
2979 u64 ino1 = 0, ino2 = 0;
2980 int pathlen1 = 0, pathlen2 = 0;
2981 bool freepath1 = false, freepath2 = false;
2982 struct dentry *old_dentry = NULL;
2983 int len;
2984 u16 releases;
2985 void *p, *end;
2986 int ret;
2987 bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME);
2988 u16 request_head_version = mds_supported_head_version(session);
2989 kuid_t caller_fsuid = req->r_cred->fsuid;
2990 kgid_t caller_fsgid = req->r_cred->fsgid;
2991
2992 ret = set_request_path_attr(mdsc, req->r_inode, req->r_dentry,
2993 req->r_parent, req->r_path1, req->r_ino1.ino,
2994 &path1, &pathlen1, &ino1, &freepath1,
2995 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2996 &req->r_req_flags));
2997 if (ret < 0) {
2998 msg = ERR_PTR(ret);
2999 goto out;
3000 }
3001
3002 /* If r_old_dentry is set, then assume that its parent is locked */
3003 if (req->r_old_dentry &&
3004 !(req->r_old_dentry->d_flags & DCACHE_DISCONNECTED))
3005 old_dentry = req->r_old_dentry;
3006 ret = set_request_path_attr(mdsc, NULL, old_dentry,
3007 req->r_old_dentry_dir,
3008 req->r_path2, req->r_ino2.ino,
3009 &path2, &pathlen2, &ino2, &freepath2, true);
3010 if (ret < 0) {
3011 msg = ERR_PTR(ret);
3012 goto out_free1;
3013 }
3014
3015 req->r_altname = get_fscrypt_altname(req, &req->r_altname_len);
3016 if (IS_ERR(req->r_altname)) {
3017 msg = ERR_CAST(req->r_altname);
3018 req->r_altname = NULL;
3019 goto out_free2;
3020 }
3021
3022 /*
3023 * For old cephs without supporting the 32bit retry/fwd feature
3024 * it will copy the raw memories directly when decoding the
3025 * requests. While new cephs will decode the head depending the
3026 * version member, so we need to make sure it will be compatible
3027 * with them both.
3028 */
3029 if (legacy)
3030 len = sizeof(struct ceph_mds_request_head_legacy);
3031 else if (request_head_version == 1)
3032 len = sizeof(struct ceph_mds_request_head_old);
3033 else if (request_head_version == 2)
3034 len = offsetofend(struct ceph_mds_request_head, ext_num_fwd);
3035 else
3036 len = sizeof(struct ceph_mds_request_head);
3037
3038 /* filepaths */
3039 len += 2 * (1 + sizeof(u32) + sizeof(u64));
3040 len += pathlen1 + pathlen2;
3041
3042 /* cap releases */
3043 len += sizeof(struct ceph_mds_request_release) *
3044 (!!req->r_inode_drop + !!req->r_dentry_drop +
3045 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
3046
3047 if (req->r_dentry_drop)
3048 len += pathlen1;
3049 if (req->r_old_dentry_drop)
3050 len += pathlen2;
3051
3052 /* MClientRequest tail */
3053
3054 /* req->r_stamp */
3055 len += sizeof(struct ceph_timespec);
3056
3057 /* gid list */
3058 len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups);
3059
3060 /* alternate name */
3061 len += sizeof(u32) + req->r_altname_len;
3062
3063 /* fscrypt_auth */
3064 len += sizeof(u32); // fscrypt_auth
3065 if (req->r_fscrypt_auth)
3066 len += ceph_fscrypt_auth_len(req->r_fscrypt_auth);
3067
3068 /* fscrypt_file */
3069 len += sizeof(u32);
3070 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags))
3071 len += sizeof(__le64);
3072
3073 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
3074 if (!msg) {
3075 msg = ERR_PTR(-ENOMEM);
3076 goto out_free2;
3077 }
3078
3079 msg->hdr.tid = cpu_to_le64(req->r_tid);
3080
3081 lhead = find_legacy_request_head(msg->front.iov_base,
3082 session->s_con.peer_features);
3083
3084 if ((req->r_mnt_idmap != &nop_mnt_idmap) &&
3085 !test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features)) {
3086 WARN_ON_ONCE(!IS_CEPH_MDS_OP_NEWINODE(req->r_op));
3087
3088 if (enable_unsafe_idmap) {
3089 pr_warn_once_client(cl,
3090 "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID"
3091 " is not supported by MDS. UID/GID-based restrictions may"
3092 " not work properly.\n");
3093
3094 caller_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns,
3095 VFSUIDT_INIT(req->r_cred->fsuid));
3096 caller_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns,
3097 VFSGIDT_INIT(req->r_cred->fsgid));
3098 } else {
3099 pr_err_ratelimited_client(cl,
3100 "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID"
3101 " is not supported by MDS. Fail request with -EIO.\n");
3102
3103 ret = -EIO;
3104 goto out_err;
3105 }
3106 }
3107
3108 /*
3109 * The ceph_mds_request_head_legacy didn't contain a version field, and
3110 * one was added when we moved the message version from 3->4.
3111 */
3112 if (legacy) {
3113 msg->hdr.version = cpu_to_le16(3);
3114 p = msg->front.iov_base + sizeof(*lhead);
3115 } else if (request_head_version == 1) {
3116 struct ceph_mds_request_head_old *ohead = msg->front.iov_base;
3117
3118 msg->hdr.version = cpu_to_le16(4);
3119 ohead->version = cpu_to_le16(1);
3120 p = msg->front.iov_base + sizeof(*ohead);
3121 } else if (request_head_version == 2) {
3122 struct ceph_mds_request_head *nhead = msg->front.iov_base;
3123
3124 msg->hdr.version = cpu_to_le16(6);
3125 nhead->version = cpu_to_le16(2);
3126
3127 p = msg->front.iov_base + offsetofend(struct ceph_mds_request_head, ext_num_fwd);
3128 } else {
3129 struct ceph_mds_request_head *nhead = msg->front.iov_base;
3130 kuid_t owner_fsuid;
3131 kgid_t owner_fsgid;
3132
3133 msg->hdr.version = cpu_to_le16(6);
3134 nhead->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION);
3135 nhead->struct_len = cpu_to_le32(sizeof(struct ceph_mds_request_head));
3136
3137 if (IS_CEPH_MDS_OP_NEWINODE(req->r_op)) {
3138 owner_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns,
3139 VFSUIDT_INIT(req->r_cred->fsuid));
3140 owner_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns,
3141 VFSGIDT_INIT(req->r_cred->fsgid));
3142 nhead->owner_uid = cpu_to_le32(from_kuid(&init_user_ns, owner_fsuid));
3143 nhead->owner_gid = cpu_to_le32(from_kgid(&init_user_ns, owner_fsgid));
3144 } else {
3145 nhead->owner_uid = cpu_to_le32(-1);
3146 nhead->owner_gid = cpu_to_le32(-1);
3147 }
3148
3149 p = msg->front.iov_base + sizeof(*nhead);
3150 }
3151
3152 end = msg->front.iov_base + msg->front.iov_len;
3153
3154 lhead->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
3155 lhead->op = cpu_to_le32(req->r_op);
3156 lhead->caller_uid = cpu_to_le32(from_kuid(&init_user_ns,
3157 caller_fsuid));
3158 lhead->caller_gid = cpu_to_le32(from_kgid(&init_user_ns,
3159 caller_fsgid));
3160 lhead->ino = cpu_to_le64(req->r_deleg_ino);
3161 lhead->args = req->r_args;
3162
3163 ceph_encode_filepath(&p, end, ino1, path1);
3164 ceph_encode_filepath(&p, end, ino2, path2);
3165
3166 /* make note of release offset, in case we need to replay */
3167 req->r_request_release_offset = p - msg->front.iov_base;
3168
3169 /* cap releases */
3170 releases = 0;
3171 if (req->r_inode_drop)
3172 releases += ceph_encode_inode_release(&p,
3173 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
3174 mds, req->r_inode_drop, req->r_inode_unless,
3175 req->r_op == CEPH_MDS_OP_READDIR);
3176 if (req->r_dentry_drop) {
3177 ret = ceph_encode_dentry_release(&p, req->r_dentry,
3178 req->r_parent, mds, req->r_dentry_drop,
3179 req->r_dentry_unless);
3180 if (ret < 0)
3181 goto out_err;
3182 releases += ret;
3183 }
3184 if (req->r_old_dentry_drop) {
3185 ret = ceph_encode_dentry_release(&p, req->r_old_dentry,
3186 req->r_old_dentry_dir, mds,
3187 req->r_old_dentry_drop,
3188 req->r_old_dentry_unless);
3189 if (ret < 0)
3190 goto out_err;
3191 releases += ret;
3192 }
3193 if (req->r_old_inode_drop)
3194 releases += ceph_encode_inode_release(&p,
3195 d_inode(req->r_old_dentry),
3196 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
3197
3198 if (drop_cap_releases) {
3199 releases = 0;
3200 p = msg->front.iov_base + req->r_request_release_offset;
3201 }
3202
3203 lhead->num_releases = cpu_to_le16(releases);
3204
3205 encode_mclientrequest_tail(&p, req);
3206
3207 if (WARN_ON_ONCE(p > end)) {
3208 ceph_msg_put(msg);
3209 msg = ERR_PTR(-ERANGE);
3210 goto out_free2;
3211 }
3212
3213 msg->front.iov_len = p - msg->front.iov_base;
3214 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
3215
3216 if (req->r_pagelist) {
3217 struct ceph_pagelist *pagelist = req->r_pagelist;
3218 ceph_msg_data_add_pagelist(msg, pagelist);
3219 msg->hdr.data_len = cpu_to_le32(pagelist->length);
3220 } else {
3221 msg->hdr.data_len = 0;
3222 }
3223
3224 msg->hdr.data_off = cpu_to_le16(0);
3225
3226out_free2:
3227 if (freepath2)
3228 ceph_mdsc_free_path((char *)path2, pathlen2);
3229out_free1:
3230 if (freepath1)
3231 ceph_mdsc_free_path((char *)path1, pathlen1);
3232out:
3233 return msg;
3234out_err:
3235 ceph_msg_put(msg);
3236 msg = ERR_PTR(ret);
3237 goto out_free2;
3238}
3239
3240/*
3241 * called under mdsc->mutex if error, under no mutex if
3242 * success.
3243 */
3244static void complete_request(struct ceph_mds_client *mdsc,
3245 struct ceph_mds_request *req)
3246{
3247 req->r_end_latency = ktime_get();
3248
3249 if (req->r_callback)
3250 req->r_callback(mdsc, req);
3251 complete_all(&req->r_completion);
3252}
3253
3254/*
3255 * called under mdsc->mutex
3256 */
3257static int __prepare_send_request(struct ceph_mds_session *session,
3258 struct ceph_mds_request *req,
3259 bool drop_cap_releases)
3260{
3261 int mds = session->s_mds;
3262 struct ceph_mds_client *mdsc = session->s_mdsc;
3263 struct ceph_client *cl = mdsc->fsc->client;
3264 struct ceph_mds_request_head_legacy *lhead;
3265 struct ceph_mds_request_head *nhead;
3266 struct ceph_msg *msg;
3267 int flags = 0, old_max_retry;
3268 bool old_version = !test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD,
3269 &session->s_features);
3270
3271 /*
3272 * Avoid inifinite retrying after overflow. The client will
3273 * increase the retry count and if the MDS is old version,
3274 * so we limit to retry at most 256 times.
3275 */
3276 if (req->r_attempts) {
3277 old_max_retry = sizeof_field(struct ceph_mds_request_head_old,
3278 num_retry);
3279 old_max_retry = 1 << (old_max_retry * BITS_PER_BYTE);
3280 if ((old_version && req->r_attempts >= old_max_retry) ||
3281 ((uint32_t)req->r_attempts >= U32_MAX)) {
3282 pr_warn_ratelimited_client(cl, "request tid %llu seq overflow\n",
3283 req->r_tid);
3284 return -EMULTIHOP;
3285 }
3286 }
3287
3288 req->r_attempts++;
3289 if (req->r_inode) {
3290 struct ceph_cap *cap =
3291 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
3292
3293 if (cap)
3294 req->r_sent_on_mseq = cap->mseq;
3295 else
3296 req->r_sent_on_mseq = -1;
3297 }
3298 doutc(cl, "%p tid %lld %s (attempt %d)\n", req, req->r_tid,
3299 ceph_mds_op_name(req->r_op), req->r_attempts);
3300
3301 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3302 void *p;
3303
3304 /*
3305 * Replay. Do not regenerate message (and rebuild
3306 * paths, etc.); just use the original message.
3307 * Rebuilding paths will break for renames because
3308 * d_move mangles the src name.
3309 */
3310 msg = req->r_request;
3311 lhead = find_legacy_request_head(msg->front.iov_base,
3312 session->s_con.peer_features);
3313
3314 flags = le32_to_cpu(lhead->flags);
3315 flags |= CEPH_MDS_FLAG_REPLAY;
3316 lhead->flags = cpu_to_le32(flags);
3317
3318 if (req->r_target_inode)
3319 lhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
3320
3321 lhead->num_retry = req->r_attempts - 1;
3322 if (!old_version) {
3323 nhead = (struct ceph_mds_request_head*)msg->front.iov_base;
3324 nhead->ext_num_retry = cpu_to_le32(req->r_attempts - 1);
3325 }
3326
3327 /* remove cap/dentry releases from message */
3328 lhead->num_releases = 0;
3329
3330 p = msg->front.iov_base + req->r_request_release_offset;
3331 encode_mclientrequest_tail(&p, req);
3332
3333 msg->front.iov_len = p - msg->front.iov_base;
3334 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
3335 return 0;
3336 }
3337
3338 if (req->r_request) {
3339 ceph_msg_put(req->r_request);
3340 req->r_request = NULL;
3341 }
3342 msg = create_request_message(session, req, drop_cap_releases);
3343 if (IS_ERR(msg)) {
3344 req->r_err = PTR_ERR(msg);
3345 return PTR_ERR(msg);
3346 }
3347 req->r_request = msg;
3348
3349 lhead = find_legacy_request_head(msg->front.iov_base,
3350 session->s_con.peer_features);
3351 lhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
3352 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3353 flags |= CEPH_MDS_FLAG_REPLAY;
3354 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags))
3355 flags |= CEPH_MDS_FLAG_ASYNC;
3356 if (req->r_parent)
3357 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
3358 lhead->flags = cpu_to_le32(flags);
3359 lhead->num_fwd = req->r_num_fwd;
3360 lhead->num_retry = req->r_attempts - 1;
3361 if (!old_version) {
3362 nhead = (struct ceph_mds_request_head*)msg->front.iov_base;
3363 nhead->ext_num_fwd = cpu_to_le32(req->r_num_fwd);
3364 nhead->ext_num_retry = cpu_to_le32(req->r_attempts - 1);
3365 }
3366
3367 doutc(cl, " r_parent = %p\n", req->r_parent);
3368 return 0;
3369}
3370
3371/*
3372 * called under mdsc->mutex
3373 */
3374static int __send_request(struct ceph_mds_session *session,
3375 struct ceph_mds_request *req,
3376 bool drop_cap_releases)
3377{
3378 int err;
3379
3380 err = __prepare_send_request(session, req, drop_cap_releases);
3381 if (!err) {
3382 ceph_msg_get(req->r_request);
3383 ceph_con_send(&session->s_con, req->r_request);
3384 }
3385
3386 return err;
3387}
3388
3389/*
3390 * send request, or put it on the appropriate wait list.
3391 */
3392static void __do_request(struct ceph_mds_client *mdsc,
3393 struct ceph_mds_request *req)
3394{
3395 struct ceph_client *cl = mdsc->fsc->client;
3396 struct ceph_mds_session *session = NULL;
3397 int mds = -1;
3398 int err = 0;
3399 bool random;
3400
3401 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
3402 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
3403 __unregister_request(mdsc, req);
3404 return;
3405 }
3406
3407 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO) {
3408 doutc(cl, "metadata corrupted\n");
3409 err = -EIO;
3410 goto finish;
3411 }
3412 if (req->r_timeout &&
3413 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
3414 doutc(cl, "timed out\n");
3415 err = -ETIMEDOUT;
3416 goto finish;
3417 }
3418 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
3419 doutc(cl, "forced umount\n");
3420 err = -EIO;
3421 goto finish;
3422 }
3423 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
3424 if (mdsc->mdsmap_err) {
3425 err = mdsc->mdsmap_err;
3426 doutc(cl, "mdsmap err %d\n", err);
3427 goto finish;
3428 }
3429 if (mdsc->mdsmap->m_epoch == 0) {
3430 doutc(cl, "no mdsmap, waiting for map\n");
3431 list_add(&req->r_wait, &mdsc->waiting_for_map);
3432 return;
3433 }
3434 if (!(mdsc->fsc->mount_options->flags &
3435 CEPH_MOUNT_OPT_MOUNTWAIT) &&
3436 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
3437 err = -EHOSTUNREACH;
3438 goto finish;
3439 }
3440 }
3441
3442 put_request_session(req);
3443
3444 mds = __choose_mds(mdsc, req, &random);
3445 if (mds < 0 ||
3446 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
3447 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
3448 err = -EJUKEBOX;
3449 goto finish;
3450 }
3451 doutc(cl, "no mds or not active, waiting for map\n");
3452 list_add(&req->r_wait, &mdsc->waiting_for_map);
3453 return;
3454 }
3455
3456 /* get, open session */
3457 session = __ceph_lookup_mds_session(mdsc, mds);
3458 if (!session) {
3459 session = register_session(mdsc, mds);
3460 if (IS_ERR(session)) {
3461 err = PTR_ERR(session);
3462 goto finish;
3463 }
3464 }
3465 req->r_session = ceph_get_mds_session(session);
3466
3467 doutc(cl, "mds%d session %p state %s\n", mds, session,
3468 ceph_session_state_name(session->s_state));
3469
3470 /*
3471 * The old ceph will crash the MDSs when see unknown OPs
3472 */
3473 if (req->r_feature_needed > 0 &&
3474 !test_bit(req->r_feature_needed, &session->s_features)) {
3475 err = -EOPNOTSUPP;
3476 goto out_session;
3477 }
3478
3479 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
3480 session->s_state != CEPH_MDS_SESSION_HUNG) {
3481 /*
3482 * We cannot queue async requests since the caps and delegated
3483 * inodes are bound to the session. Just return -EJUKEBOX and
3484 * let the caller retry a sync request in that case.
3485 */
3486 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
3487 err = -EJUKEBOX;
3488 goto out_session;
3489 }
3490
3491 /*
3492 * If the session has been REJECTED, then return a hard error,
3493 * unless it's a CLEANRECOVER mount, in which case we'll queue
3494 * it to the mdsc queue.
3495 */
3496 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
3497 if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER))
3498 list_add(&req->r_wait, &mdsc->waiting_for_map);
3499 else
3500 err = -EACCES;
3501 goto out_session;
3502 }
3503
3504 if (session->s_state == CEPH_MDS_SESSION_NEW ||
3505 session->s_state == CEPH_MDS_SESSION_CLOSING) {
3506 err = __open_session(mdsc, session);
3507 if (err)
3508 goto out_session;
3509 /* retry the same mds later */
3510 if (random)
3511 req->r_resend_mds = mds;
3512 }
3513 list_add(&req->r_wait, &session->s_waiting);
3514 goto out_session;
3515 }
3516
3517 /* send request */
3518 req->r_resend_mds = -1; /* forget any previous mds hint */
3519
3520 if (req->r_request_started == 0) /* note request start time */
3521 req->r_request_started = jiffies;
3522
3523 /*
3524 * For async create we will choose the auth MDS of frag in parent
3525 * directory to send the request and ususally this works fine, but
3526 * if the migrated the dirtory to another MDS before it could handle
3527 * it the request will be forwarded.
3528 *
3529 * And then the auth cap will be changed.
3530 */
3531 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) && req->r_num_fwd) {
3532 struct ceph_dentry_info *di = ceph_dentry(req->r_dentry);
3533 struct ceph_inode_info *ci;
3534 struct ceph_cap *cap;
3535
3536 /*
3537 * The request maybe handled very fast and the new inode
3538 * hasn't been linked to the dentry yet. We need to wait
3539 * for the ceph_finish_async_create(), which shouldn't be
3540 * stuck too long or fail in thoery, to finish when forwarding
3541 * the request.
3542 */
3543 if (!d_inode(req->r_dentry)) {
3544 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT,
3545 TASK_KILLABLE);
3546 if (err) {
3547 mutex_lock(&req->r_fill_mutex);
3548 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3549 mutex_unlock(&req->r_fill_mutex);
3550 goto out_session;
3551 }
3552 }
3553
3554 ci = ceph_inode(d_inode(req->r_dentry));
3555
3556 spin_lock(&ci->i_ceph_lock);
3557 cap = ci->i_auth_cap;
3558 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE && mds != cap->mds) {
3559 doutc(cl, "session changed for auth cap %d -> %d\n",
3560 cap->session->s_mds, session->s_mds);
3561
3562 /* Remove the auth cap from old session */
3563 spin_lock(&cap->session->s_cap_lock);
3564 cap->session->s_nr_caps--;
3565 list_del_init(&cap->session_caps);
3566 spin_unlock(&cap->session->s_cap_lock);
3567
3568 /* Add the auth cap to the new session */
3569 cap->mds = mds;
3570 cap->session = session;
3571 spin_lock(&session->s_cap_lock);
3572 session->s_nr_caps++;
3573 list_add_tail(&cap->session_caps, &session->s_caps);
3574 spin_unlock(&session->s_cap_lock);
3575
3576 change_auth_cap_ses(ci, session);
3577 }
3578 spin_unlock(&ci->i_ceph_lock);
3579 }
3580
3581 err = __send_request(session, req, false);
3582
3583out_session:
3584 ceph_put_mds_session(session);
3585finish:
3586 if (err) {
3587 doutc(cl, "early error %d\n", err);
3588 req->r_err = err;
3589 complete_request(mdsc, req);
3590 __unregister_request(mdsc, req);
3591 }
3592 return;
3593}
3594
3595/*
3596 * called under mdsc->mutex
3597 */
3598static void __wake_requests(struct ceph_mds_client *mdsc,
3599 struct list_head *head)
3600{
3601 struct ceph_client *cl = mdsc->fsc->client;
3602 struct ceph_mds_request *req;
3603 LIST_HEAD(tmp_list);
3604
3605 list_splice_init(head, &tmp_list);
3606
3607 while (!list_empty(&tmp_list)) {
3608 req = list_entry(tmp_list.next,
3609 struct ceph_mds_request, r_wait);
3610 list_del_init(&req->r_wait);
3611 doutc(cl, " wake request %p tid %llu\n", req,
3612 req->r_tid);
3613 __do_request(mdsc, req);
3614 }
3615}
3616
3617/*
3618 * Wake up threads with requests pending for @mds, so that they can
3619 * resubmit their requests to a possibly different mds.
3620 */
3621static void kick_requests(struct ceph_mds_client *mdsc, int mds)
3622{
3623 struct ceph_client *cl = mdsc->fsc->client;
3624 struct ceph_mds_request *req;
3625 struct rb_node *p = rb_first(&mdsc->request_tree);
3626
3627 doutc(cl, "kick_requests mds%d\n", mds);
3628 while (p) {
3629 req = rb_entry(p, struct ceph_mds_request, r_node);
3630 p = rb_next(p);
3631 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3632 continue;
3633 if (req->r_attempts > 0)
3634 continue; /* only new requests */
3635 if (req->r_session &&
3636 req->r_session->s_mds == mds) {
3637 doutc(cl, " kicking tid %llu\n", req->r_tid);
3638 list_del_init(&req->r_wait);
3639 __do_request(mdsc, req);
3640 }
3641 }
3642}
3643
3644int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
3645 struct ceph_mds_request *req)
3646{
3647 struct ceph_client *cl = mdsc->fsc->client;
3648 int err = 0;
3649
3650 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
3651 if (req->r_inode)
3652 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
3653 if (req->r_parent) {
3654 struct ceph_inode_info *ci = ceph_inode(req->r_parent);
3655 int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ?
3656 CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD;
3657 spin_lock(&ci->i_ceph_lock);
3658 ceph_take_cap_refs(ci, CEPH_CAP_PIN, false);
3659 __ceph_touch_fmode(ci, mdsc, fmode);
3660 spin_unlock(&ci->i_ceph_lock);
3661 }
3662 if (req->r_old_dentry_dir)
3663 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
3664 CEPH_CAP_PIN);
3665
3666 if (req->r_inode) {
3667 err = ceph_wait_on_async_create(req->r_inode);
3668 if (err) {
3669 doutc(cl, "wait for async create returned: %d\n", err);
3670 return err;
3671 }
3672 }
3673
3674 if (!err && req->r_old_inode) {
3675 err = ceph_wait_on_async_create(req->r_old_inode);
3676 if (err) {
3677 doutc(cl, "wait for async create returned: %d\n", err);
3678 return err;
3679 }
3680 }
3681
3682 doutc(cl, "submit_request on %p for inode %p\n", req, dir);
3683 mutex_lock(&mdsc->mutex);
3684 __register_request(mdsc, req, dir);
3685 __do_request(mdsc, req);
3686 err = req->r_err;
3687 mutex_unlock(&mdsc->mutex);
3688 return err;
3689}
3690
3691int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
3692 struct ceph_mds_request *req,
3693 ceph_mds_request_wait_callback_t wait_func)
3694{
3695 struct ceph_client *cl = mdsc->fsc->client;
3696 int err;
3697
3698 /* wait */
3699 doutc(cl, "do_request waiting\n");
3700 if (wait_func) {
3701 err = wait_func(mdsc, req);
3702 } else {
3703 long timeleft = wait_for_completion_killable_timeout(
3704 &req->r_completion,
3705 ceph_timeout_jiffies(req->r_timeout));
3706 if (timeleft > 0)
3707 err = 0;
3708 else if (!timeleft)
3709 err = -ETIMEDOUT; /* timed out */
3710 else
3711 err = timeleft; /* killed */
3712 }
3713 doutc(cl, "do_request waited, got %d\n", err);
3714 mutex_lock(&mdsc->mutex);
3715
3716 /* only abort if we didn't race with a real reply */
3717 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
3718 err = le32_to_cpu(req->r_reply_info.head->result);
3719 } else if (err < 0) {
3720 doutc(cl, "aborted request %lld with %d\n", req->r_tid, err);
3721
3722 /*
3723 * ensure we aren't running concurrently with
3724 * ceph_fill_trace or ceph_readdir_prepopulate, which
3725 * rely on locks (dir mutex) held by our caller.
3726 */
3727 mutex_lock(&req->r_fill_mutex);
3728 req->r_err = err;
3729 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3730 mutex_unlock(&req->r_fill_mutex);
3731
3732 if (req->r_parent &&
3733 (req->r_op & CEPH_MDS_OP_WRITE))
3734 ceph_invalidate_dir_request(req);
3735 } else {
3736 err = req->r_err;
3737 }
3738
3739 mutex_unlock(&mdsc->mutex);
3740 return err;
3741}
3742
3743/*
3744 * Synchrously perform an mds request. Take care of all of the
3745 * session setup, forwarding, retry details.
3746 */
3747int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
3748 struct inode *dir,
3749 struct ceph_mds_request *req)
3750{
3751 struct ceph_client *cl = mdsc->fsc->client;
3752 int err;
3753
3754 doutc(cl, "do_request on %p\n", req);
3755
3756 /* issue */
3757 err = ceph_mdsc_submit_request(mdsc, dir, req);
3758 if (!err)
3759 err = ceph_mdsc_wait_request(mdsc, req, NULL);
3760 doutc(cl, "do_request %p done, result %d\n", req, err);
3761 return err;
3762}
3763
3764/*
3765 * Invalidate dir's completeness, dentry lease state on an aborted MDS
3766 * namespace request.
3767 */
3768void ceph_invalidate_dir_request(struct ceph_mds_request *req)
3769{
3770 struct inode *dir = req->r_parent;
3771 struct inode *old_dir = req->r_old_dentry_dir;
3772 struct ceph_client *cl = req->r_mdsc->fsc->client;
3773
3774 doutc(cl, "invalidate_dir_request %p %p (complete, lease(s))\n",
3775 dir, old_dir);
3776
3777 ceph_dir_clear_complete(dir);
3778 if (old_dir)
3779 ceph_dir_clear_complete(old_dir);
3780 if (req->r_dentry)
3781 ceph_invalidate_dentry_lease(req->r_dentry);
3782 if (req->r_old_dentry)
3783 ceph_invalidate_dentry_lease(req->r_old_dentry);
3784}
3785
3786/*
3787 * Handle mds reply.
3788 *
3789 * We take the session mutex and parse and process the reply immediately.
3790 * This preserves the logical ordering of replies, capabilities, etc., sent
3791 * by the MDS as they are applied to our local cache.
3792 */
3793static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
3794{
3795 struct ceph_mds_client *mdsc = session->s_mdsc;
3796 struct ceph_client *cl = mdsc->fsc->client;
3797 struct ceph_mds_request *req;
3798 struct ceph_mds_reply_head *head = msg->front.iov_base;
3799 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
3800 struct ceph_snap_realm *realm;
3801 u64 tid;
3802 int err, result;
3803 int mds = session->s_mds;
3804 bool close_sessions = false;
3805
3806 if (msg->front.iov_len < sizeof(*head)) {
3807 pr_err_client(cl, "got corrupt (short) reply\n");
3808 ceph_msg_dump(msg);
3809 return;
3810 }
3811
3812 /* get request, session */
3813 tid = le64_to_cpu(msg->hdr.tid);
3814 mutex_lock(&mdsc->mutex);
3815 req = lookup_get_request(mdsc, tid);
3816 if (!req) {
3817 doutc(cl, "on unknown tid %llu\n", tid);
3818 mutex_unlock(&mdsc->mutex);
3819 return;
3820 }
3821 doutc(cl, "handle_reply %p\n", req);
3822
3823 /* correct session? */
3824 if (req->r_session != session) {
3825 pr_err_client(cl, "got %llu on session mds%d not mds%d\n",
3826 tid, session->s_mds,
3827 req->r_session ? req->r_session->s_mds : -1);
3828 mutex_unlock(&mdsc->mutex);
3829 goto out;
3830 }
3831
3832 /* dup? */
3833 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
3834 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
3835 pr_warn_client(cl, "got a dup %s reply on %llu from mds%d\n",
3836 head->safe ? "safe" : "unsafe", tid, mds);
3837 mutex_unlock(&mdsc->mutex);
3838 goto out;
3839 }
3840 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
3841 pr_warn_client(cl, "got unsafe after safe on %llu from mds%d\n",
3842 tid, mds);
3843 mutex_unlock(&mdsc->mutex);
3844 goto out;
3845 }
3846
3847 result = le32_to_cpu(head->result);
3848
3849 if (head->safe) {
3850 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
3851 __unregister_request(mdsc, req);
3852
3853 /* last request during umount? */
3854 if (mdsc->stopping && !__get_oldest_req(mdsc))
3855 complete_all(&mdsc->safe_umount_waiters);
3856
3857 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3858 /*
3859 * We already handled the unsafe response, now do the
3860 * cleanup. No need to examine the response; the MDS
3861 * doesn't include any result info in the safe
3862 * response. And even if it did, there is nothing
3863 * useful we could do with a revised return value.
3864 */
3865 doutc(cl, "got safe reply %llu, mds%d\n", tid, mds);
3866
3867 mutex_unlock(&mdsc->mutex);
3868 goto out;
3869 }
3870 } else {
3871 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
3872 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
3873 }
3874
3875 doutc(cl, "tid %lld result %d\n", tid, result);
3876 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
3877 err = parse_reply_info(session, msg, req, (u64)-1);
3878 else
3879 err = parse_reply_info(session, msg, req,
3880 session->s_con.peer_features);
3881 mutex_unlock(&mdsc->mutex);
3882
3883 /* Must find target inode outside of mutexes to avoid deadlocks */
3884 rinfo = &req->r_reply_info;
3885 if ((err >= 0) && rinfo->head->is_target) {
3886 struct inode *in = xchg(&req->r_new_inode, NULL);
3887 struct ceph_vino tvino = {
3888 .ino = le64_to_cpu(rinfo->targeti.in->ino),
3889 .snap = le64_to_cpu(rinfo->targeti.in->snapid)
3890 };
3891
3892 /*
3893 * If we ended up opening an existing inode, discard
3894 * r_new_inode
3895 */
3896 if (req->r_op == CEPH_MDS_OP_CREATE &&
3897 !req->r_reply_info.has_create_ino) {
3898 /* This should never happen on an async create */
3899 WARN_ON_ONCE(req->r_deleg_ino);
3900 iput(in);
3901 in = NULL;
3902 }
3903
3904 in = ceph_get_inode(mdsc->fsc->sb, tvino, in);
3905 if (IS_ERR(in)) {
3906 err = PTR_ERR(in);
3907 mutex_lock(&session->s_mutex);
3908 goto out_err;
3909 }
3910 req->r_target_inode = in;
3911 }
3912
3913 mutex_lock(&session->s_mutex);
3914 if (err < 0) {
3915 pr_err_client(cl, "got corrupt reply mds%d(tid:%lld)\n",
3916 mds, tid);
3917 ceph_msg_dump(msg);
3918 goto out_err;
3919 }
3920
3921 /* snap trace */
3922 realm = NULL;
3923 if (rinfo->snapblob_len) {
3924 down_write(&mdsc->snap_rwsem);
3925 err = ceph_update_snap_trace(mdsc, rinfo->snapblob,
3926 rinfo->snapblob + rinfo->snapblob_len,
3927 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
3928 &realm);
3929 if (err) {
3930 up_write(&mdsc->snap_rwsem);
3931 close_sessions = true;
3932 if (err == -EIO)
3933 ceph_msg_dump(msg);
3934 goto out_err;
3935 }
3936 downgrade_write(&mdsc->snap_rwsem);
3937 } else {
3938 down_read(&mdsc->snap_rwsem);
3939 }
3940
3941 /* insert trace into our cache */
3942 mutex_lock(&req->r_fill_mutex);
3943 current->journal_info = req;
3944 err = ceph_fill_trace(mdsc->fsc->sb, req);
3945 if (err == 0) {
3946 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
3947 req->r_op == CEPH_MDS_OP_LSSNAP))
3948 err = ceph_readdir_prepopulate(req, req->r_session);
3949 }
3950 current->journal_info = NULL;
3951 mutex_unlock(&req->r_fill_mutex);
3952
3953 up_read(&mdsc->snap_rwsem);
3954 if (realm)
3955 ceph_put_snap_realm(mdsc, realm);
3956
3957 if (err == 0) {
3958 if (req->r_target_inode &&
3959 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3960 struct ceph_inode_info *ci =
3961 ceph_inode(req->r_target_inode);
3962 spin_lock(&ci->i_unsafe_lock);
3963 list_add_tail(&req->r_unsafe_target_item,
3964 &ci->i_unsafe_iops);
3965 spin_unlock(&ci->i_unsafe_lock);
3966 }
3967
3968 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
3969 }
3970out_err:
3971 mutex_lock(&mdsc->mutex);
3972 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3973 if (err) {
3974 req->r_err = err;
3975 } else {
3976 req->r_reply = ceph_msg_get(msg);
3977 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
3978 }
3979 } else {
3980 doutc(cl, "reply arrived after request %lld was aborted\n", tid);
3981 }
3982 mutex_unlock(&mdsc->mutex);
3983
3984 mutex_unlock(&session->s_mutex);
3985
3986 /* kick calling process */
3987 complete_request(mdsc, req);
3988
3989 ceph_update_metadata_metrics(&mdsc->metric, req->r_start_latency,
3990 req->r_end_latency, err);
3991out:
3992 ceph_mdsc_put_request(req);
3993
3994 /* Defer closing the sessions after s_mutex lock being released */
3995 if (close_sessions)
3996 ceph_mdsc_close_sessions(mdsc);
3997 return;
3998}
3999
4000
4001
4002/*
4003 * handle mds notification that our request has been forwarded.
4004 */
4005static void handle_forward(struct ceph_mds_client *mdsc,
4006 struct ceph_mds_session *session,
4007 struct ceph_msg *msg)
4008{
4009 struct ceph_client *cl = mdsc->fsc->client;
4010 struct ceph_mds_request *req;
4011 u64 tid = le64_to_cpu(msg->hdr.tid);
4012 u32 next_mds;
4013 u32 fwd_seq;
4014 int err = -EINVAL;
4015 void *p = msg->front.iov_base;
4016 void *end = p + msg->front.iov_len;
4017 bool aborted = false;
4018
4019 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
4020 next_mds = ceph_decode_32(&p);
4021 fwd_seq = ceph_decode_32(&p);
4022
4023 mutex_lock(&mdsc->mutex);
4024 req = lookup_get_request(mdsc, tid);
4025 if (!req) {
4026 mutex_unlock(&mdsc->mutex);
4027 doutc(cl, "forward tid %llu to mds%d - req dne\n", tid, next_mds);
4028 return; /* dup reply? */
4029 }
4030
4031 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
4032 doutc(cl, "forward tid %llu aborted, unregistering\n", tid);
4033 __unregister_request(mdsc, req);
4034 } else if (fwd_seq <= req->r_num_fwd || (uint32_t)fwd_seq >= U32_MAX) {
4035 /*
4036 * Avoid inifinite retrying after overflow.
4037 *
4038 * The MDS will increase the fwd count and in client side
4039 * if the num_fwd is less than the one saved in request
4040 * that means the MDS is an old version and overflowed of
4041 * 8 bits.
4042 */
4043 mutex_lock(&req->r_fill_mutex);
4044 req->r_err = -EMULTIHOP;
4045 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
4046 mutex_unlock(&req->r_fill_mutex);
4047 aborted = true;
4048 pr_warn_ratelimited_client(cl, "forward tid %llu seq overflow\n",
4049 tid);
4050 } else {
4051 /* resend. forward race not possible; mds would drop */
4052 doutc(cl, "forward tid %llu to mds%d (we resend)\n", tid, next_mds);
4053 BUG_ON(req->r_err);
4054 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
4055 req->r_attempts = 0;
4056 req->r_num_fwd = fwd_seq;
4057 req->r_resend_mds = next_mds;
4058 put_request_session(req);
4059 __do_request(mdsc, req);
4060 }
4061 mutex_unlock(&mdsc->mutex);
4062
4063 /* kick calling process */
4064 if (aborted)
4065 complete_request(mdsc, req);
4066 ceph_mdsc_put_request(req);
4067 return;
4068
4069bad:
4070 pr_err_client(cl, "decode error err=%d\n", err);
4071 ceph_msg_dump(msg);
4072}
4073
4074static int __decode_session_metadata(void **p, void *end,
4075 bool *blocklisted)
4076{
4077 /* map<string,string> */
4078 u32 n;
4079 bool err_str;
4080 ceph_decode_32_safe(p, end, n, bad);
4081 while (n-- > 0) {
4082 u32 len;
4083 ceph_decode_32_safe(p, end, len, bad);
4084 ceph_decode_need(p, end, len, bad);
4085 err_str = !strncmp(*p, "error_string", len);
4086 *p += len;
4087 ceph_decode_32_safe(p, end, len, bad);
4088 ceph_decode_need(p, end, len, bad);
4089 /*
4090 * Match "blocklisted (blacklisted)" from newer MDSes,
4091 * or "blacklisted" from older MDSes.
4092 */
4093 if (err_str && strnstr(*p, "blacklisted", len))
4094 *blocklisted = true;
4095 *p += len;
4096 }
4097 return 0;
4098bad:
4099 return -1;
4100}
4101
4102/*
4103 * handle a mds session control message
4104 */
4105static void handle_session(struct ceph_mds_session *session,
4106 struct ceph_msg *msg)
4107{
4108 struct ceph_mds_client *mdsc = session->s_mdsc;
4109 struct ceph_client *cl = mdsc->fsc->client;
4110 int mds = session->s_mds;
4111 int msg_version = le16_to_cpu(msg->hdr.version);
4112 void *p = msg->front.iov_base;
4113 void *end = p + msg->front.iov_len;
4114 struct ceph_mds_session_head *h;
4115 u32 op;
4116 u64 seq, features = 0;
4117 int wake = 0;
4118 bool blocklisted = false;
4119
4120 /* decode */
4121 ceph_decode_need(&p, end, sizeof(*h), bad);
4122 h = p;
4123 p += sizeof(*h);
4124
4125 op = le32_to_cpu(h->op);
4126 seq = le64_to_cpu(h->seq);
4127
4128 if (msg_version >= 3) {
4129 u32 len;
4130 /* version >= 2 and < 5, decode metadata, skip otherwise
4131 * as it's handled via flags.
4132 */
4133 if (msg_version >= 5)
4134 ceph_decode_skip_map(&p, end, string, string, bad);
4135 else if (__decode_session_metadata(&p, end, &blocklisted) < 0)
4136 goto bad;
4137
4138 /* version >= 3, feature bits */
4139 ceph_decode_32_safe(&p, end, len, bad);
4140 if (len) {
4141 ceph_decode_64_safe(&p, end, features, bad);
4142 p += len - sizeof(features);
4143 }
4144 }
4145
4146 if (msg_version >= 5) {
4147 u32 flags, len;
4148
4149 /* version >= 4 */
4150 ceph_decode_skip_16(&p, end, bad); /* struct_v, struct_cv */
4151 ceph_decode_32_safe(&p, end, len, bad); /* len */
4152 ceph_decode_skip_n(&p, end, len, bad); /* metric_spec */
4153
4154 /* version >= 5, flags */
4155 ceph_decode_32_safe(&p, end, flags, bad);
4156 if (flags & CEPH_SESSION_BLOCKLISTED) {
4157 pr_warn_client(cl, "mds%d session blocklisted\n",
4158 session->s_mds);
4159 blocklisted = true;
4160 }
4161 }
4162
4163 mutex_lock(&mdsc->mutex);
4164 if (op == CEPH_SESSION_CLOSE) {
4165 ceph_get_mds_session(session);
4166 __unregister_session(mdsc, session);
4167 }
4168 /* FIXME: this ttl calculation is generous */
4169 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
4170 mutex_unlock(&mdsc->mutex);
4171
4172 mutex_lock(&session->s_mutex);
4173
4174 doutc(cl, "mds%d %s %p state %s seq %llu\n", mds,
4175 ceph_session_op_name(op), session,
4176 ceph_session_state_name(session->s_state), seq);
4177
4178 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
4179 session->s_state = CEPH_MDS_SESSION_OPEN;
4180 pr_info_client(cl, "mds%d came back\n", session->s_mds);
4181 }
4182
4183 switch (op) {
4184 case CEPH_SESSION_OPEN:
4185 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
4186 pr_info_client(cl, "mds%d reconnect success\n",
4187 session->s_mds);
4188
4189 session->s_features = features;
4190 if (session->s_state == CEPH_MDS_SESSION_OPEN) {
4191 pr_notice_client(cl, "mds%d is already opened\n",
4192 session->s_mds);
4193 } else {
4194 session->s_state = CEPH_MDS_SESSION_OPEN;
4195 renewed_caps(mdsc, session, 0);
4196 if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT,
4197 &session->s_features))
4198 metric_schedule_delayed(&mdsc->metric);
4199 }
4200
4201 /*
4202 * The connection maybe broken and the session in client
4203 * side has been reinitialized, need to update the seq
4204 * anyway.
4205 */
4206 if (!session->s_seq && seq)
4207 session->s_seq = seq;
4208
4209 wake = 1;
4210 if (mdsc->stopping)
4211 __close_session(mdsc, session);
4212 break;
4213
4214 case CEPH_SESSION_RENEWCAPS:
4215 if (session->s_renew_seq == seq)
4216 renewed_caps(mdsc, session, 1);
4217 break;
4218
4219 case CEPH_SESSION_CLOSE:
4220 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
4221 pr_info_client(cl, "mds%d reconnect denied\n",
4222 session->s_mds);
4223 session->s_state = CEPH_MDS_SESSION_CLOSED;
4224 cleanup_session_requests(mdsc, session);
4225 remove_session_caps(session);
4226 wake = 2; /* for good measure */
4227 wake_up_all(&mdsc->session_close_wq);
4228 break;
4229
4230 case CEPH_SESSION_STALE:
4231 pr_info_client(cl, "mds%d caps went stale, renewing\n",
4232 session->s_mds);
4233 atomic_inc(&session->s_cap_gen);
4234 session->s_cap_ttl = jiffies - 1;
4235 send_renew_caps(mdsc, session);
4236 break;
4237
4238 case CEPH_SESSION_RECALL_STATE:
4239 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
4240 break;
4241
4242 case CEPH_SESSION_FLUSHMSG:
4243 /* flush cap releases */
4244 spin_lock(&session->s_cap_lock);
4245 if (session->s_num_cap_releases)
4246 ceph_flush_cap_releases(mdsc, session);
4247 spin_unlock(&session->s_cap_lock);
4248
4249 send_flushmsg_ack(mdsc, session, seq);
4250 break;
4251
4252 case CEPH_SESSION_FORCE_RO:
4253 doutc(cl, "force_session_readonly %p\n", session);
4254 spin_lock(&session->s_cap_lock);
4255 session->s_readonly = true;
4256 spin_unlock(&session->s_cap_lock);
4257 wake_up_session_caps(session, FORCE_RO);
4258 break;
4259
4260 case CEPH_SESSION_REJECT:
4261 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
4262 pr_info_client(cl, "mds%d rejected session\n",
4263 session->s_mds);
4264 session->s_state = CEPH_MDS_SESSION_REJECTED;
4265 cleanup_session_requests(mdsc, session);
4266 remove_session_caps(session);
4267 if (blocklisted)
4268 mdsc->fsc->blocklisted = true;
4269 wake = 2; /* for good measure */
4270 break;
4271
4272 default:
4273 pr_err_client(cl, "bad op %d mds%d\n", op, mds);
4274 WARN_ON(1);
4275 }
4276
4277 mutex_unlock(&session->s_mutex);
4278 if (wake) {
4279 mutex_lock(&mdsc->mutex);
4280 __wake_requests(mdsc, &session->s_waiting);
4281 if (wake == 2)
4282 kick_requests(mdsc, mds);
4283 mutex_unlock(&mdsc->mutex);
4284 }
4285 if (op == CEPH_SESSION_CLOSE)
4286 ceph_put_mds_session(session);
4287 return;
4288
4289bad:
4290 pr_err_client(cl, "corrupt message mds%d len %d\n", mds,
4291 (int)msg->front.iov_len);
4292 ceph_msg_dump(msg);
4293 return;
4294}
4295
4296void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req)
4297{
4298 struct ceph_client *cl = req->r_mdsc->fsc->client;
4299 int dcaps;
4300
4301 dcaps = xchg(&req->r_dir_caps, 0);
4302 if (dcaps) {
4303 doutc(cl, "releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
4304 ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps);
4305 }
4306}
4307
4308void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req)
4309{
4310 struct ceph_client *cl = req->r_mdsc->fsc->client;
4311 int dcaps;
4312
4313 dcaps = xchg(&req->r_dir_caps, 0);
4314 if (dcaps) {
4315 doutc(cl, "releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
4316 ceph_put_cap_refs_async(ceph_inode(req->r_parent), dcaps);
4317 }
4318}
4319
4320/*
4321 * called under session->mutex.
4322 */
4323static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
4324 struct ceph_mds_session *session)
4325{
4326 struct ceph_mds_request *req, *nreq;
4327 struct rb_node *p;
4328
4329 doutc(mdsc->fsc->client, "mds%d\n", session->s_mds);
4330
4331 mutex_lock(&mdsc->mutex);
4332 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item)
4333 __send_request(session, req, true);
4334
4335 /*
4336 * also re-send old requests when MDS enters reconnect stage. So that MDS
4337 * can process completed request in clientreplay stage.
4338 */
4339 p = rb_first(&mdsc->request_tree);
4340 while (p) {
4341 req = rb_entry(p, struct ceph_mds_request, r_node);
4342 p = rb_next(p);
4343 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
4344 continue;
4345 if (req->r_attempts == 0)
4346 continue; /* only old requests */
4347 if (!req->r_session)
4348 continue;
4349 if (req->r_session->s_mds != session->s_mds)
4350 continue;
4351
4352 ceph_mdsc_release_dir_caps_async(req);
4353
4354 __send_request(session, req, true);
4355 }
4356 mutex_unlock(&mdsc->mutex);
4357}
4358
4359static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
4360{
4361 struct ceph_msg *reply;
4362 struct ceph_pagelist *_pagelist;
4363 struct page *page;
4364 __le32 *addr;
4365 int err = -ENOMEM;
4366
4367 if (!recon_state->allow_multi)
4368 return -ENOSPC;
4369
4370 /* can't handle message that contains both caps and realm */
4371 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
4372
4373 /* pre-allocate new pagelist */
4374 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
4375 if (!_pagelist)
4376 return -ENOMEM;
4377
4378 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
4379 if (!reply)
4380 goto fail_msg;
4381
4382 /* placeholder for nr_caps */
4383 err = ceph_pagelist_encode_32(_pagelist, 0);
4384 if (err < 0)
4385 goto fail;
4386
4387 if (recon_state->nr_caps) {
4388 /* currently encoding caps */
4389 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
4390 if (err)
4391 goto fail;
4392 } else {
4393 /* placeholder for nr_realms (currently encoding relams) */
4394 err = ceph_pagelist_encode_32(_pagelist, 0);
4395 if (err < 0)
4396 goto fail;
4397 }
4398
4399 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
4400 if (err)
4401 goto fail;
4402
4403 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
4404 addr = kmap_atomic(page);
4405 if (recon_state->nr_caps) {
4406 /* currently encoding caps */
4407 *addr = cpu_to_le32(recon_state->nr_caps);
4408 } else {
4409 /* currently encoding relams */
4410 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
4411 }
4412 kunmap_atomic(addr);
4413
4414 reply->hdr.version = cpu_to_le16(5);
4415 reply->hdr.compat_version = cpu_to_le16(4);
4416
4417 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
4418 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
4419
4420 ceph_con_send(&recon_state->session->s_con, reply);
4421 ceph_pagelist_release(recon_state->pagelist);
4422
4423 recon_state->pagelist = _pagelist;
4424 recon_state->nr_caps = 0;
4425 recon_state->nr_realms = 0;
4426 recon_state->msg_version = 5;
4427 return 0;
4428fail:
4429 ceph_msg_put(reply);
4430fail_msg:
4431 ceph_pagelist_release(_pagelist);
4432 return err;
4433}
4434
4435static struct dentry* d_find_primary(struct inode *inode)
4436{
4437 struct dentry *alias, *dn = NULL;
4438
4439 if (hlist_empty(&inode->i_dentry))
4440 return NULL;
4441
4442 spin_lock(&inode->i_lock);
4443 if (hlist_empty(&inode->i_dentry))
4444 goto out_unlock;
4445
4446 if (S_ISDIR(inode->i_mode)) {
4447 alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
4448 if (!IS_ROOT(alias))
4449 dn = dget(alias);
4450 goto out_unlock;
4451 }
4452
4453 hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
4454 spin_lock(&alias->d_lock);
4455 if (!d_unhashed(alias) &&
4456 (ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) {
4457 dn = dget_dlock(alias);
4458 }
4459 spin_unlock(&alias->d_lock);
4460 if (dn)
4461 break;
4462 }
4463out_unlock:
4464 spin_unlock(&inode->i_lock);
4465 return dn;
4466}
4467
4468/*
4469 * Encode information about a cap for a reconnect with the MDS.
4470 */
4471static int reconnect_caps_cb(struct inode *inode, int mds, void *arg)
4472{
4473 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
4474 struct ceph_client *cl = ceph_inode_to_client(inode);
4475 union {
4476 struct ceph_mds_cap_reconnect v2;
4477 struct ceph_mds_cap_reconnect_v1 v1;
4478 } rec;
4479 struct ceph_inode_info *ci = ceph_inode(inode);
4480 struct ceph_reconnect_state *recon_state = arg;
4481 struct ceph_pagelist *pagelist = recon_state->pagelist;
4482 struct dentry *dentry;
4483 struct ceph_cap *cap;
4484 char *path;
4485 int pathlen = 0, err;
4486 u64 pathbase;
4487 u64 snap_follows;
4488
4489 dentry = d_find_primary(inode);
4490 if (dentry) {
4491 /* set pathbase to parent dir when msg_version >= 2 */
4492 path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, &pathbase,
4493 recon_state->msg_version >= 2);
4494 dput(dentry);
4495 if (IS_ERR(path)) {
4496 err = PTR_ERR(path);
4497 goto out_err;
4498 }
4499 } else {
4500 path = NULL;
4501 pathbase = 0;
4502 }
4503
4504 spin_lock(&ci->i_ceph_lock);
4505 cap = __get_cap_for_mds(ci, mds);
4506 if (!cap) {
4507 spin_unlock(&ci->i_ceph_lock);
4508 err = 0;
4509 goto out_err;
4510 }
4511 doutc(cl, " adding %p ino %llx.%llx cap %p %lld %s\n", inode,
4512 ceph_vinop(inode), cap, cap->cap_id,
4513 ceph_cap_string(cap->issued));
4514
4515 cap->seq = 0; /* reset cap seq */
4516 cap->issue_seq = 0; /* and issue_seq */
4517 cap->mseq = 0; /* and migrate_seq */
4518 cap->cap_gen = atomic_read(&cap->session->s_cap_gen);
4519
4520 /* These are lost when the session goes away */
4521 if (S_ISDIR(inode->i_mode)) {
4522 if (cap->issued & CEPH_CAP_DIR_CREATE) {
4523 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
4524 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
4525 }
4526 cap->issued &= ~CEPH_CAP_ANY_DIR_OPS;
4527 }
4528
4529 if (recon_state->msg_version >= 2) {
4530 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
4531 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
4532 rec.v2.issued = cpu_to_le32(cap->issued);
4533 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
4534 rec.v2.pathbase = cpu_to_le64(pathbase);
4535 rec.v2.flock_len = (__force __le32)
4536 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
4537 } else {
4538 struct timespec64 ts;
4539
4540 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
4541 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
4542 rec.v1.issued = cpu_to_le32(cap->issued);
4543 rec.v1.size = cpu_to_le64(i_size_read(inode));
4544 ts = inode_get_mtime(inode);
4545 ceph_encode_timespec64(&rec.v1.mtime, &ts);
4546 ts = inode_get_atime(inode);
4547 ceph_encode_timespec64(&rec.v1.atime, &ts);
4548 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
4549 rec.v1.pathbase = cpu_to_le64(pathbase);
4550 }
4551
4552 if (list_empty(&ci->i_cap_snaps)) {
4553 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
4554 } else {
4555 struct ceph_cap_snap *capsnap =
4556 list_first_entry(&ci->i_cap_snaps,
4557 struct ceph_cap_snap, ci_item);
4558 snap_follows = capsnap->follows;
4559 }
4560 spin_unlock(&ci->i_ceph_lock);
4561
4562 if (recon_state->msg_version >= 2) {
4563 int num_fcntl_locks, num_flock_locks;
4564 struct ceph_filelock *flocks = NULL;
4565 size_t struct_len, total_len = sizeof(u64);
4566 u8 struct_v = 0;
4567
4568encode_again:
4569 if (rec.v2.flock_len) {
4570 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
4571 } else {
4572 num_fcntl_locks = 0;
4573 num_flock_locks = 0;
4574 }
4575 if (num_fcntl_locks + num_flock_locks > 0) {
4576 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
4577 sizeof(struct ceph_filelock),
4578 GFP_NOFS);
4579 if (!flocks) {
4580 err = -ENOMEM;
4581 goto out_err;
4582 }
4583 err = ceph_encode_locks_to_buffer(inode, flocks,
4584 num_fcntl_locks,
4585 num_flock_locks);
4586 if (err) {
4587 kfree(flocks);
4588 flocks = NULL;
4589 if (err == -ENOSPC)
4590 goto encode_again;
4591 goto out_err;
4592 }
4593 } else {
4594 kfree(flocks);
4595 flocks = NULL;
4596 }
4597
4598 if (recon_state->msg_version >= 3) {
4599 /* version, compat_version and struct_len */
4600 total_len += 2 * sizeof(u8) + sizeof(u32);
4601 struct_v = 2;
4602 }
4603 /*
4604 * number of encoded locks is stable, so copy to pagelist
4605 */
4606 struct_len = 2 * sizeof(u32) +
4607 (num_fcntl_locks + num_flock_locks) *
4608 sizeof(struct ceph_filelock);
4609 rec.v2.flock_len = cpu_to_le32(struct_len);
4610
4611 struct_len += sizeof(u32) + pathlen + sizeof(rec.v2);
4612
4613 if (struct_v >= 2)
4614 struct_len += sizeof(u64); /* snap_follows */
4615
4616 total_len += struct_len;
4617
4618 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
4619 err = send_reconnect_partial(recon_state);
4620 if (err)
4621 goto out_freeflocks;
4622 pagelist = recon_state->pagelist;
4623 }
4624
4625 err = ceph_pagelist_reserve(pagelist, total_len);
4626 if (err)
4627 goto out_freeflocks;
4628
4629 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
4630 if (recon_state->msg_version >= 3) {
4631 ceph_pagelist_encode_8(pagelist, struct_v);
4632 ceph_pagelist_encode_8(pagelist, 1);
4633 ceph_pagelist_encode_32(pagelist, struct_len);
4634 }
4635 ceph_pagelist_encode_string(pagelist, path, pathlen);
4636 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
4637 ceph_locks_to_pagelist(flocks, pagelist,
4638 num_fcntl_locks, num_flock_locks);
4639 if (struct_v >= 2)
4640 ceph_pagelist_encode_64(pagelist, snap_follows);
4641out_freeflocks:
4642 kfree(flocks);
4643 } else {
4644 err = ceph_pagelist_reserve(pagelist,
4645 sizeof(u64) + sizeof(u32) +
4646 pathlen + sizeof(rec.v1));
4647 if (err)
4648 goto out_err;
4649
4650 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
4651 ceph_pagelist_encode_string(pagelist, path, pathlen);
4652 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
4653 }
4654
4655out_err:
4656 ceph_mdsc_free_path(path, pathlen);
4657 if (!err)
4658 recon_state->nr_caps++;
4659 return err;
4660}
4661
4662static int encode_snap_realms(struct ceph_mds_client *mdsc,
4663 struct ceph_reconnect_state *recon_state)
4664{
4665 struct rb_node *p;
4666 struct ceph_pagelist *pagelist = recon_state->pagelist;
4667 struct ceph_client *cl = mdsc->fsc->client;
4668 int err = 0;
4669
4670 if (recon_state->msg_version >= 4) {
4671 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
4672 if (err < 0)
4673 goto fail;
4674 }
4675
4676 /*
4677 * snaprealms. we provide mds with the ino, seq (version), and
4678 * parent for all of our realms. If the mds has any newer info,
4679 * it will tell us.
4680 */
4681 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
4682 struct ceph_snap_realm *realm =
4683 rb_entry(p, struct ceph_snap_realm, node);
4684 struct ceph_mds_snaprealm_reconnect sr_rec;
4685
4686 if (recon_state->msg_version >= 4) {
4687 size_t need = sizeof(u8) * 2 + sizeof(u32) +
4688 sizeof(sr_rec);
4689
4690 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
4691 err = send_reconnect_partial(recon_state);
4692 if (err)
4693 goto fail;
4694 pagelist = recon_state->pagelist;
4695 }
4696
4697 err = ceph_pagelist_reserve(pagelist, need);
4698 if (err)
4699 goto fail;
4700
4701 ceph_pagelist_encode_8(pagelist, 1);
4702 ceph_pagelist_encode_8(pagelist, 1);
4703 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
4704 }
4705
4706 doutc(cl, " adding snap realm %llx seq %lld parent %llx\n",
4707 realm->ino, realm->seq, realm->parent_ino);
4708 sr_rec.ino = cpu_to_le64(realm->ino);
4709 sr_rec.seq = cpu_to_le64(realm->seq);
4710 sr_rec.parent = cpu_to_le64(realm->parent_ino);
4711
4712 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
4713 if (err)
4714 goto fail;
4715
4716 recon_state->nr_realms++;
4717 }
4718fail:
4719 return err;
4720}
4721
4722
4723/*
4724 * If an MDS fails and recovers, clients need to reconnect in order to
4725 * reestablish shared state. This includes all caps issued through
4726 * this session _and_ the snap_realm hierarchy. Because it's not
4727 * clear which snap realms the mds cares about, we send everything we
4728 * know about.. that ensures we'll then get any new info the
4729 * recovering MDS might have.
4730 *
4731 * This is a relatively heavyweight operation, but it's rare.
4732 */
4733static void send_mds_reconnect(struct ceph_mds_client *mdsc,
4734 struct ceph_mds_session *session)
4735{
4736 struct ceph_client *cl = mdsc->fsc->client;
4737 struct ceph_msg *reply;
4738 int mds = session->s_mds;
4739 int err = -ENOMEM;
4740 struct ceph_reconnect_state recon_state = {
4741 .session = session,
4742 };
4743 LIST_HEAD(dispose);
4744
4745 pr_info_client(cl, "mds%d reconnect start\n", mds);
4746
4747 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
4748 if (!recon_state.pagelist)
4749 goto fail_nopagelist;
4750
4751 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
4752 if (!reply)
4753 goto fail_nomsg;
4754
4755 xa_destroy(&session->s_delegated_inos);
4756
4757 mutex_lock(&session->s_mutex);
4758 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
4759 session->s_seq = 0;
4760
4761 doutc(cl, "session %p state %s\n", session,
4762 ceph_session_state_name(session->s_state));
4763
4764 atomic_inc(&session->s_cap_gen);
4765
4766 spin_lock(&session->s_cap_lock);
4767 /* don't know if session is readonly */
4768 session->s_readonly = 0;
4769 /*
4770 * notify __ceph_remove_cap() that we are composing cap reconnect.
4771 * If a cap get released before being added to the cap reconnect,
4772 * __ceph_remove_cap() should skip queuing cap release.
4773 */
4774 session->s_cap_reconnect = 1;
4775 /* drop old cap expires; we're about to reestablish that state */
4776 detach_cap_releases(session, &dispose);
4777 spin_unlock(&session->s_cap_lock);
4778 dispose_cap_releases(mdsc, &dispose);
4779
4780 /* trim unused caps to reduce MDS's cache rejoin time */
4781 if (mdsc->fsc->sb->s_root)
4782 shrink_dcache_parent(mdsc->fsc->sb->s_root);
4783
4784 ceph_con_close(&session->s_con);
4785 ceph_con_open(&session->s_con,
4786 CEPH_ENTITY_TYPE_MDS, mds,
4787 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
4788
4789 /* replay unsafe requests */
4790 replay_unsafe_requests(mdsc, session);
4791
4792 ceph_early_kick_flushing_caps(mdsc, session);
4793
4794 down_read(&mdsc->snap_rwsem);
4795
4796 /* placeholder for nr_caps */
4797 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
4798 if (err)
4799 goto fail;
4800
4801 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
4802 recon_state.msg_version = 3;
4803 recon_state.allow_multi = true;
4804 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
4805 recon_state.msg_version = 3;
4806 } else {
4807 recon_state.msg_version = 2;
4808 }
4809 /* trsaverse this session's caps */
4810 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state);
4811
4812 spin_lock(&session->s_cap_lock);
4813 session->s_cap_reconnect = 0;
4814 spin_unlock(&session->s_cap_lock);
4815
4816 if (err < 0)
4817 goto fail;
4818
4819 /* check if all realms can be encoded into current message */
4820 if (mdsc->num_snap_realms) {
4821 size_t total_len =
4822 recon_state.pagelist->length +
4823 mdsc->num_snap_realms *
4824 sizeof(struct ceph_mds_snaprealm_reconnect);
4825 if (recon_state.msg_version >= 4) {
4826 /* number of realms */
4827 total_len += sizeof(u32);
4828 /* version, compat_version and struct_len */
4829 total_len += mdsc->num_snap_realms *
4830 (2 * sizeof(u8) + sizeof(u32));
4831 }
4832 if (total_len > RECONNECT_MAX_SIZE) {
4833 if (!recon_state.allow_multi) {
4834 err = -ENOSPC;
4835 goto fail;
4836 }
4837 if (recon_state.nr_caps) {
4838 err = send_reconnect_partial(&recon_state);
4839 if (err)
4840 goto fail;
4841 }
4842 recon_state.msg_version = 5;
4843 }
4844 }
4845
4846 err = encode_snap_realms(mdsc, &recon_state);
4847 if (err < 0)
4848 goto fail;
4849
4850 if (recon_state.msg_version >= 5) {
4851 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
4852 if (err < 0)
4853 goto fail;
4854 }
4855
4856 if (recon_state.nr_caps || recon_state.nr_realms) {
4857 struct page *page =
4858 list_first_entry(&recon_state.pagelist->head,
4859 struct page, lru);
4860 __le32 *addr = kmap_atomic(page);
4861 if (recon_state.nr_caps) {
4862 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
4863 *addr = cpu_to_le32(recon_state.nr_caps);
4864 } else if (recon_state.msg_version >= 4) {
4865 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
4866 }
4867 kunmap_atomic(addr);
4868 }
4869
4870 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
4871 if (recon_state.msg_version >= 4)
4872 reply->hdr.compat_version = cpu_to_le16(4);
4873
4874 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
4875 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
4876
4877 ceph_con_send(&session->s_con, reply);
4878
4879 mutex_unlock(&session->s_mutex);
4880
4881 mutex_lock(&mdsc->mutex);
4882 __wake_requests(mdsc, &session->s_waiting);
4883 mutex_unlock(&mdsc->mutex);
4884
4885 up_read(&mdsc->snap_rwsem);
4886 ceph_pagelist_release(recon_state.pagelist);
4887 return;
4888
4889fail:
4890 ceph_msg_put(reply);
4891 up_read(&mdsc->snap_rwsem);
4892 mutex_unlock(&session->s_mutex);
4893fail_nomsg:
4894 ceph_pagelist_release(recon_state.pagelist);
4895fail_nopagelist:
4896 pr_err_client(cl, "error %d preparing reconnect for mds%d\n",
4897 err, mds);
4898 return;
4899}
4900
4901
4902/*
4903 * compare old and new mdsmaps, kicking requests
4904 * and closing out old connections as necessary
4905 *
4906 * called under mdsc->mutex.
4907 */
4908static void check_new_map(struct ceph_mds_client *mdsc,
4909 struct ceph_mdsmap *newmap,
4910 struct ceph_mdsmap *oldmap)
4911{
4912 int i, j, err;
4913 int oldstate, newstate;
4914 struct ceph_mds_session *s;
4915 unsigned long targets[DIV_ROUND_UP(CEPH_MAX_MDS, sizeof(unsigned long))] = {0};
4916 struct ceph_client *cl = mdsc->fsc->client;
4917
4918 doutc(cl, "new %u old %u\n", newmap->m_epoch, oldmap->m_epoch);
4919
4920 if (newmap->m_info) {
4921 for (i = 0; i < newmap->possible_max_rank; i++) {
4922 for (j = 0; j < newmap->m_info[i].num_export_targets; j++)
4923 set_bit(newmap->m_info[i].export_targets[j], targets);
4924 }
4925 }
4926
4927 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) {
4928 if (!mdsc->sessions[i])
4929 continue;
4930 s = mdsc->sessions[i];
4931 oldstate = ceph_mdsmap_get_state(oldmap, i);
4932 newstate = ceph_mdsmap_get_state(newmap, i);
4933
4934 doutc(cl, "mds%d state %s%s -> %s%s (session %s)\n",
4935 i, ceph_mds_state_name(oldstate),
4936 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
4937 ceph_mds_state_name(newstate),
4938 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
4939 ceph_session_state_name(s->s_state));
4940
4941 if (i >= newmap->possible_max_rank) {
4942 /* force close session for stopped mds */
4943 ceph_get_mds_session(s);
4944 __unregister_session(mdsc, s);
4945 __wake_requests(mdsc, &s->s_waiting);
4946 mutex_unlock(&mdsc->mutex);
4947
4948 mutex_lock(&s->s_mutex);
4949 cleanup_session_requests(mdsc, s);
4950 remove_session_caps(s);
4951 mutex_unlock(&s->s_mutex);
4952
4953 ceph_put_mds_session(s);
4954
4955 mutex_lock(&mdsc->mutex);
4956 kick_requests(mdsc, i);
4957 continue;
4958 }
4959
4960 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
4961 ceph_mdsmap_get_addr(newmap, i),
4962 sizeof(struct ceph_entity_addr))) {
4963 /* just close it */
4964 mutex_unlock(&mdsc->mutex);
4965 mutex_lock(&s->s_mutex);
4966 mutex_lock(&mdsc->mutex);
4967 ceph_con_close(&s->s_con);
4968 mutex_unlock(&s->s_mutex);
4969 s->s_state = CEPH_MDS_SESSION_RESTARTING;
4970 } else if (oldstate == newstate) {
4971 continue; /* nothing new with this mds */
4972 }
4973
4974 /*
4975 * send reconnect?
4976 */
4977 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
4978 newstate >= CEPH_MDS_STATE_RECONNECT) {
4979 mutex_unlock(&mdsc->mutex);
4980 clear_bit(i, targets);
4981 send_mds_reconnect(mdsc, s);
4982 mutex_lock(&mdsc->mutex);
4983 }
4984
4985 /*
4986 * kick request on any mds that has gone active.
4987 */
4988 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
4989 newstate >= CEPH_MDS_STATE_ACTIVE) {
4990 if (oldstate != CEPH_MDS_STATE_CREATING &&
4991 oldstate != CEPH_MDS_STATE_STARTING)
4992 pr_info_client(cl, "mds%d recovery completed\n",
4993 s->s_mds);
4994 kick_requests(mdsc, i);
4995 mutex_unlock(&mdsc->mutex);
4996 mutex_lock(&s->s_mutex);
4997 mutex_lock(&mdsc->mutex);
4998 ceph_kick_flushing_caps(mdsc, s);
4999 mutex_unlock(&s->s_mutex);
5000 wake_up_session_caps(s, RECONNECT);
5001 }
5002 }
5003
5004 /*
5005 * Only open and reconnect sessions that don't exist yet.
5006 */
5007 for (i = 0; i < newmap->possible_max_rank; i++) {
5008 /*
5009 * In case the import MDS is crashed just after
5010 * the EImportStart journal is flushed, so when
5011 * a standby MDS takes over it and is replaying
5012 * the EImportStart journal the new MDS daemon
5013 * will wait the client to reconnect it, but the
5014 * client may never register/open the session yet.
5015 *
5016 * Will try to reconnect that MDS daemon if the
5017 * rank number is in the export targets array and
5018 * is the up:reconnect state.
5019 */
5020 newstate = ceph_mdsmap_get_state(newmap, i);
5021 if (!test_bit(i, targets) || newstate != CEPH_MDS_STATE_RECONNECT)
5022 continue;
5023
5024 /*
5025 * The session maybe registered and opened by some
5026 * requests which were choosing random MDSes during
5027 * the mdsc->mutex's unlock/lock gap below in rare
5028 * case. But the related MDS daemon will just queue
5029 * that requests and be still waiting for the client's
5030 * reconnection request in up:reconnect state.
5031 */
5032 s = __ceph_lookup_mds_session(mdsc, i);
5033 if (likely(!s)) {
5034 s = __open_export_target_session(mdsc, i);
5035 if (IS_ERR(s)) {
5036 err = PTR_ERR(s);
5037 pr_err_client(cl,
5038 "failed to open export target session, err %d\n",
5039 err);
5040 continue;
5041 }
5042 }
5043 doutc(cl, "send reconnect to export target mds.%d\n", i);
5044 mutex_unlock(&mdsc->mutex);
5045 send_mds_reconnect(mdsc, s);
5046 ceph_put_mds_session(s);
5047 mutex_lock(&mdsc->mutex);
5048 }
5049
5050 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) {
5051 s = mdsc->sessions[i];
5052 if (!s)
5053 continue;
5054 if (!ceph_mdsmap_is_laggy(newmap, i))
5055 continue;
5056 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
5057 s->s_state == CEPH_MDS_SESSION_HUNG ||
5058 s->s_state == CEPH_MDS_SESSION_CLOSING) {
5059 doutc(cl, " connecting to export targets of laggy mds%d\n", i);
5060 __open_export_target_sessions(mdsc, s);
5061 }
5062 }
5063}
5064
5065
5066
5067/*
5068 * leases
5069 */
5070
5071/*
5072 * caller must hold session s_mutex, dentry->d_lock
5073 */
5074void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
5075{
5076 struct ceph_dentry_info *di = ceph_dentry(dentry);
5077
5078 ceph_put_mds_session(di->lease_session);
5079 di->lease_session = NULL;
5080}
5081
5082static void handle_lease(struct ceph_mds_client *mdsc,
5083 struct ceph_mds_session *session,
5084 struct ceph_msg *msg)
5085{
5086 struct ceph_client *cl = mdsc->fsc->client;
5087 struct super_block *sb = mdsc->fsc->sb;
5088 struct inode *inode;
5089 struct dentry *parent, *dentry;
5090 struct ceph_dentry_info *di;
5091 int mds = session->s_mds;
5092 struct ceph_mds_lease *h = msg->front.iov_base;
5093 u32 seq;
5094 struct ceph_vino vino;
5095 struct qstr dname;
5096 int release = 0;
5097
5098 doutc(cl, "from mds%d\n", mds);
5099
5100 if (!ceph_inc_mds_stopping_blocker(mdsc, session))
5101 return;
5102
5103 /* decode */
5104 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
5105 goto bad;
5106 vino.ino = le64_to_cpu(h->ino);
5107 vino.snap = CEPH_NOSNAP;
5108 seq = le32_to_cpu(h->seq);
5109 dname.len = get_unaligned_le32(h + 1);
5110 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
5111 goto bad;
5112 dname.name = (void *)(h + 1) + sizeof(u32);
5113
5114 /* lookup inode */
5115 inode = ceph_find_inode(sb, vino);
5116 doutc(cl, "%s, ino %llx %p %.*s\n", ceph_lease_op_name(h->action),
5117 vino.ino, inode, dname.len, dname.name);
5118
5119 mutex_lock(&session->s_mutex);
5120 if (!inode) {
5121 doutc(cl, "no inode %llx\n", vino.ino);
5122 goto release;
5123 }
5124
5125 /* dentry */
5126 parent = d_find_alias(inode);
5127 if (!parent) {
5128 doutc(cl, "no parent dentry on inode %p\n", inode);
5129 WARN_ON(1);
5130 goto release; /* hrm... */
5131 }
5132 dname.hash = full_name_hash(parent, dname.name, dname.len);
5133 dentry = d_lookup(parent, &dname);
5134 dput(parent);
5135 if (!dentry)
5136 goto release;
5137
5138 spin_lock(&dentry->d_lock);
5139 di = ceph_dentry(dentry);
5140 switch (h->action) {
5141 case CEPH_MDS_LEASE_REVOKE:
5142 if (di->lease_session == session) {
5143 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
5144 h->seq = cpu_to_le32(di->lease_seq);
5145 __ceph_mdsc_drop_dentry_lease(dentry);
5146 }
5147 release = 1;
5148 break;
5149
5150 case CEPH_MDS_LEASE_RENEW:
5151 if (di->lease_session == session &&
5152 di->lease_gen == atomic_read(&session->s_cap_gen) &&
5153 di->lease_renew_from &&
5154 di->lease_renew_after == 0) {
5155 unsigned long duration =
5156 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
5157
5158 di->lease_seq = seq;
5159 di->time = di->lease_renew_from + duration;
5160 di->lease_renew_after = di->lease_renew_from +
5161 (duration >> 1);
5162 di->lease_renew_from = 0;
5163 }
5164 break;
5165 }
5166 spin_unlock(&dentry->d_lock);
5167 dput(dentry);
5168
5169 if (!release)
5170 goto out;
5171
5172release:
5173 /* let's just reuse the same message */
5174 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
5175 ceph_msg_get(msg);
5176 ceph_con_send(&session->s_con, msg);
5177
5178out:
5179 mutex_unlock(&session->s_mutex);
5180 iput(inode);
5181
5182 ceph_dec_mds_stopping_blocker(mdsc);
5183 return;
5184
5185bad:
5186 ceph_dec_mds_stopping_blocker(mdsc);
5187
5188 pr_err_client(cl, "corrupt lease message\n");
5189 ceph_msg_dump(msg);
5190}
5191
5192void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
5193 struct dentry *dentry, char action,
5194 u32 seq)
5195{
5196 struct ceph_client *cl = session->s_mdsc->fsc->client;
5197 struct ceph_msg *msg;
5198 struct ceph_mds_lease *lease;
5199 struct inode *dir;
5200 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
5201
5202 doutc(cl, "identry %p %s to mds%d\n", dentry, ceph_lease_op_name(action),
5203 session->s_mds);
5204
5205 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
5206 if (!msg)
5207 return;
5208 lease = msg->front.iov_base;
5209 lease->action = action;
5210 lease->seq = cpu_to_le32(seq);
5211
5212 spin_lock(&dentry->d_lock);
5213 dir = d_inode(dentry->d_parent);
5214 lease->ino = cpu_to_le64(ceph_ino(dir));
5215 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
5216
5217 put_unaligned_le32(dentry->d_name.len, lease + 1);
5218 memcpy((void *)(lease + 1) + 4,
5219 dentry->d_name.name, dentry->d_name.len);
5220 spin_unlock(&dentry->d_lock);
5221
5222 ceph_con_send(&session->s_con, msg);
5223}
5224
5225/*
5226 * lock unlock the session, to wait ongoing session activities
5227 */
5228static void lock_unlock_session(struct ceph_mds_session *s)
5229{
5230 mutex_lock(&s->s_mutex);
5231 mutex_unlock(&s->s_mutex);
5232}
5233
5234static void maybe_recover_session(struct ceph_mds_client *mdsc)
5235{
5236 struct ceph_client *cl = mdsc->fsc->client;
5237 struct ceph_fs_client *fsc = mdsc->fsc;
5238
5239 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
5240 return;
5241
5242 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
5243 return;
5244
5245 if (!READ_ONCE(fsc->blocklisted))
5246 return;
5247
5248 pr_info_client(cl, "auto reconnect after blocklisted\n");
5249 ceph_force_reconnect(fsc->sb);
5250}
5251
5252bool check_session_state(struct ceph_mds_session *s)
5253{
5254 struct ceph_client *cl = s->s_mdsc->fsc->client;
5255
5256 switch (s->s_state) {
5257 case CEPH_MDS_SESSION_OPEN:
5258 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
5259 s->s_state = CEPH_MDS_SESSION_HUNG;
5260 pr_info_client(cl, "mds%d hung\n", s->s_mds);
5261 }
5262 break;
5263 case CEPH_MDS_SESSION_CLOSING:
5264 case CEPH_MDS_SESSION_NEW:
5265 case CEPH_MDS_SESSION_RESTARTING:
5266 case CEPH_MDS_SESSION_CLOSED:
5267 case CEPH_MDS_SESSION_REJECTED:
5268 return false;
5269 }
5270
5271 return true;
5272}
5273
5274/*
5275 * If the sequence is incremented while we're waiting on a REQUEST_CLOSE reply,
5276 * then we need to retransmit that request.
5277 */
5278void inc_session_sequence(struct ceph_mds_session *s)
5279{
5280 struct ceph_client *cl = s->s_mdsc->fsc->client;
5281
5282 lockdep_assert_held(&s->s_mutex);
5283
5284 s->s_seq++;
5285
5286 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
5287 int ret;
5288
5289 doutc(cl, "resending session close request for mds%d\n", s->s_mds);
5290 ret = request_close_session(s);
5291 if (ret < 0)
5292 pr_err_client(cl, "unable to close session to mds%d: %d\n",
5293 s->s_mds, ret);
5294 }
5295}
5296
5297/*
5298 * delayed work -- periodically trim expired leases, renew caps with mds. If
5299 * the @delay parameter is set to 0 or if it's more than 5 secs, the default
5300 * workqueue delay value of 5 secs will be used.
5301 */
5302static void schedule_delayed(struct ceph_mds_client *mdsc, unsigned long delay)
5303{
5304 unsigned long max_delay = HZ * 5;
5305
5306 /* 5 secs default delay */
5307 if (!delay || (delay > max_delay))
5308 delay = max_delay;
5309 schedule_delayed_work(&mdsc->delayed_work,
5310 round_jiffies_relative(delay));
5311}
5312
5313static void delayed_work(struct work_struct *work)
5314{
5315 struct ceph_mds_client *mdsc =
5316 container_of(work, struct ceph_mds_client, delayed_work.work);
5317 unsigned long delay;
5318 int renew_interval;
5319 int renew_caps;
5320 int i;
5321
5322 doutc(mdsc->fsc->client, "mdsc delayed_work\n");
5323
5324 if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHED)
5325 return;
5326
5327 mutex_lock(&mdsc->mutex);
5328 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
5329 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
5330 mdsc->last_renew_caps);
5331 if (renew_caps)
5332 mdsc->last_renew_caps = jiffies;
5333
5334 for (i = 0; i < mdsc->max_sessions; i++) {
5335 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
5336 if (!s)
5337 continue;
5338
5339 if (!check_session_state(s)) {
5340 ceph_put_mds_session(s);
5341 continue;
5342 }
5343 mutex_unlock(&mdsc->mutex);
5344
5345 mutex_lock(&s->s_mutex);
5346 if (renew_caps)
5347 send_renew_caps(mdsc, s);
5348 else
5349 ceph_con_keepalive(&s->s_con);
5350 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
5351 s->s_state == CEPH_MDS_SESSION_HUNG)
5352 ceph_send_cap_releases(mdsc, s);
5353 mutex_unlock(&s->s_mutex);
5354 ceph_put_mds_session(s);
5355
5356 mutex_lock(&mdsc->mutex);
5357 }
5358 mutex_unlock(&mdsc->mutex);
5359
5360 delay = ceph_check_delayed_caps(mdsc);
5361
5362 ceph_queue_cap_reclaim_work(mdsc);
5363
5364 ceph_trim_snapid_map(mdsc);
5365
5366 maybe_recover_session(mdsc);
5367
5368 schedule_delayed(mdsc, delay);
5369}
5370
5371int ceph_mdsc_init(struct ceph_fs_client *fsc)
5372
5373{
5374 struct ceph_mds_client *mdsc;
5375 int err;
5376
5377 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
5378 if (!mdsc)
5379 return -ENOMEM;
5380 mdsc->fsc = fsc;
5381 mutex_init(&mdsc->mutex);
5382 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
5383 if (!mdsc->mdsmap) {
5384 err = -ENOMEM;
5385 goto err_mdsc;
5386 }
5387
5388 init_completion(&mdsc->safe_umount_waiters);
5389 spin_lock_init(&mdsc->stopping_lock);
5390 atomic_set(&mdsc->stopping_blockers, 0);
5391 init_completion(&mdsc->stopping_waiter);
5392 init_waitqueue_head(&mdsc->session_close_wq);
5393 INIT_LIST_HEAD(&mdsc->waiting_for_map);
5394 mdsc->quotarealms_inodes = RB_ROOT;
5395 mutex_init(&mdsc->quotarealms_inodes_mutex);
5396 init_rwsem(&mdsc->snap_rwsem);
5397 mdsc->snap_realms = RB_ROOT;
5398 INIT_LIST_HEAD(&mdsc->snap_empty);
5399 spin_lock_init(&mdsc->snap_empty_lock);
5400 mdsc->request_tree = RB_ROOT;
5401 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
5402 mdsc->last_renew_caps = jiffies;
5403 INIT_LIST_HEAD(&mdsc->cap_delay_list);
5404 INIT_LIST_HEAD(&mdsc->cap_wait_list);
5405 spin_lock_init(&mdsc->cap_delay_lock);
5406 INIT_LIST_HEAD(&mdsc->cap_unlink_delay_list);
5407 INIT_LIST_HEAD(&mdsc->snap_flush_list);
5408 spin_lock_init(&mdsc->snap_flush_lock);
5409 mdsc->last_cap_flush_tid = 1;
5410 INIT_LIST_HEAD(&mdsc->cap_flush_list);
5411 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
5412 spin_lock_init(&mdsc->cap_dirty_lock);
5413 init_waitqueue_head(&mdsc->cap_flushing_wq);
5414 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
5415 INIT_WORK(&mdsc->cap_unlink_work, ceph_cap_unlink_work);
5416 err = ceph_metric_init(&mdsc->metric);
5417 if (err)
5418 goto err_mdsmap;
5419
5420 spin_lock_init(&mdsc->dentry_list_lock);
5421 INIT_LIST_HEAD(&mdsc->dentry_leases);
5422 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
5423
5424 ceph_caps_init(mdsc);
5425 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
5426
5427 spin_lock_init(&mdsc->snapid_map_lock);
5428 mdsc->snapid_map_tree = RB_ROOT;
5429 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
5430
5431 init_rwsem(&mdsc->pool_perm_rwsem);
5432 mdsc->pool_perm_tree = RB_ROOT;
5433
5434 strscpy(mdsc->nodename, utsname()->nodename,
5435 sizeof(mdsc->nodename));
5436
5437 fsc->mdsc = mdsc;
5438 return 0;
5439
5440err_mdsmap:
5441 kfree(mdsc->mdsmap);
5442err_mdsc:
5443 kfree(mdsc);
5444 return err;
5445}
5446
5447/*
5448 * Wait for safe replies on open mds requests. If we time out, drop
5449 * all requests from the tree to avoid dangling dentry refs.
5450 */
5451static void wait_requests(struct ceph_mds_client *mdsc)
5452{
5453 struct ceph_client *cl = mdsc->fsc->client;
5454 struct ceph_options *opts = mdsc->fsc->client->options;
5455 struct ceph_mds_request *req;
5456
5457 mutex_lock(&mdsc->mutex);
5458 if (__get_oldest_req(mdsc)) {
5459 mutex_unlock(&mdsc->mutex);
5460
5461 doutc(cl, "waiting for requests\n");
5462 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
5463 ceph_timeout_jiffies(opts->mount_timeout));
5464
5465 /* tear down remaining requests */
5466 mutex_lock(&mdsc->mutex);
5467 while ((req = __get_oldest_req(mdsc))) {
5468 doutc(cl, "timed out on tid %llu\n", req->r_tid);
5469 list_del_init(&req->r_wait);
5470 __unregister_request(mdsc, req);
5471 }
5472 }
5473 mutex_unlock(&mdsc->mutex);
5474 doutc(cl, "done\n");
5475}
5476
5477void send_flush_mdlog(struct ceph_mds_session *s)
5478{
5479 struct ceph_client *cl = s->s_mdsc->fsc->client;
5480 struct ceph_msg *msg;
5481
5482 /*
5483 * Pre-luminous MDS crashes when it sees an unknown session request
5484 */
5485 if (!CEPH_HAVE_FEATURE(s->s_con.peer_features, SERVER_LUMINOUS))
5486 return;
5487
5488 mutex_lock(&s->s_mutex);
5489 doutc(cl, "request mdlog flush to mds%d (%s)s seq %lld\n",
5490 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
5491 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_FLUSH_MDLOG,
5492 s->s_seq);
5493 if (!msg) {
5494 pr_err_client(cl, "failed to request mdlog flush to mds%d (%s) seq %lld\n",
5495 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
5496 } else {
5497 ceph_con_send(&s->s_con, msg);
5498 }
5499 mutex_unlock(&s->s_mutex);
5500}
5501
5502/*
5503 * called before mount is ro, and before dentries are torn down.
5504 * (hmm, does this still race with new lookups?)
5505 */
5506void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
5507{
5508 doutc(mdsc->fsc->client, "begin\n");
5509 mdsc->stopping = CEPH_MDSC_STOPPING_BEGIN;
5510
5511 ceph_mdsc_iterate_sessions(mdsc, send_flush_mdlog, true);
5512 ceph_mdsc_iterate_sessions(mdsc, lock_unlock_session, false);
5513 ceph_flush_dirty_caps(mdsc);
5514 wait_requests(mdsc);
5515
5516 /*
5517 * wait for reply handlers to drop their request refs and
5518 * their inode/dcache refs
5519 */
5520 ceph_msgr_flush();
5521
5522 ceph_cleanup_quotarealms_inodes(mdsc);
5523 doutc(mdsc->fsc->client, "done\n");
5524}
5525
5526/*
5527 * flush the mdlog and wait for all write mds requests to flush.
5528 */
5529static void flush_mdlog_and_wait_mdsc_unsafe_requests(struct ceph_mds_client *mdsc,
5530 u64 want_tid)
5531{
5532 struct ceph_client *cl = mdsc->fsc->client;
5533 struct ceph_mds_request *req = NULL, *nextreq;
5534 struct ceph_mds_session *last_session = NULL;
5535 struct rb_node *n;
5536
5537 mutex_lock(&mdsc->mutex);
5538 doutc(cl, "want %lld\n", want_tid);
5539restart:
5540 req = __get_oldest_req(mdsc);
5541 while (req && req->r_tid <= want_tid) {
5542 /* find next request */
5543 n = rb_next(&req->r_node);
5544 if (n)
5545 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
5546 else
5547 nextreq = NULL;
5548 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
5549 (req->r_op & CEPH_MDS_OP_WRITE)) {
5550 struct ceph_mds_session *s = req->r_session;
5551
5552 if (!s) {
5553 req = nextreq;
5554 continue;
5555 }
5556
5557 /* write op */
5558 ceph_mdsc_get_request(req);
5559 if (nextreq)
5560 ceph_mdsc_get_request(nextreq);
5561 s = ceph_get_mds_session(s);
5562 mutex_unlock(&mdsc->mutex);
5563
5564 /* send flush mdlog request to MDS */
5565 if (last_session != s) {
5566 send_flush_mdlog(s);
5567 ceph_put_mds_session(last_session);
5568 last_session = s;
5569 } else {
5570 ceph_put_mds_session(s);
5571 }
5572 doutc(cl, "wait on %llu (want %llu)\n",
5573 req->r_tid, want_tid);
5574 wait_for_completion(&req->r_safe_completion);
5575
5576 mutex_lock(&mdsc->mutex);
5577 ceph_mdsc_put_request(req);
5578 if (!nextreq)
5579 break; /* next dne before, so we're done! */
5580 if (RB_EMPTY_NODE(&nextreq->r_node)) {
5581 /* next request was removed from tree */
5582 ceph_mdsc_put_request(nextreq);
5583 goto restart;
5584 }
5585 ceph_mdsc_put_request(nextreq); /* won't go away */
5586 }
5587 req = nextreq;
5588 }
5589 mutex_unlock(&mdsc->mutex);
5590 ceph_put_mds_session(last_session);
5591 doutc(cl, "done\n");
5592}
5593
5594void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
5595{
5596 struct ceph_client *cl = mdsc->fsc->client;
5597 u64 want_tid, want_flush;
5598
5599 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN)
5600 return;
5601
5602 doutc(cl, "sync\n");
5603 mutex_lock(&mdsc->mutex);
5604 want_tid = mdsc->last_tid;
5605 mutex_unlock(&mdsc->mutex);
5606
5607 ceph_flush_dirty_caps(mdsc);
5608 spin_lock(&mdsc->cap_dirty_lock);
5609 want_flush = mdsc->last_cap_flush_tid;
5610 if (!list_empty(&mdsc->cap_flush_list)) {
5611 struct ceph_cap_flush *cf =
5612 list_last_entry(&mdsc->cap_flush_list,
5613 struct ceph_cap_flush, g_list);
5614 cf->wake = true;
5615 }
5616 spin_unlock(&mdsc->cap_dirty_lock);
5617
5618 doutc(cl, "sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
5619
5620 flush_mdlog_and_wait_mdsc_unsafe_requests(mdsc, want_tid);
5621 wait_caps_flush(mdsc, want_flush);
5622}
5623
5624/*
5625 * true if all sessions are closed, or we force unmount
5626 */
5627static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
5628{
5629 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
5630 return true;
5631 return atomic_read(&mdsc->num_sessions) <= skipped;
5632}
5633
5634/*
5635 * called after sb is ro or when metadata corrupted.
5636 */
5637void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
5638{
5639 struct ceph_options *opts = mdsc->fsc->client->options;
5640 struct ceph_client *cl = mdsc->fsc->client;
5641 struct ceph_mds_session *session;
5642 int i;
5643 int skipped = 0;
5644
5645 doutc(cl, "begin\n");
5646
5647 /* close sessions */
5648 mutex_lock(&mdsc->mutex);
5649 for (i = 0; i < mdsc->max_sessions; i++) {
5650 session = __ceph_lookup_mds_session(mdsc, i);
5651 if (!session)
5652 continue;
5653 mutex_unlock(&mdsc->mutex);
5654 mutex_lock(&session->s_mutex);
5655 if (__close_session(mdsc, session) <= 0)
5656 skipped++;
5657 mutex_unlock(&session->s_mutex);
5658 ceph_put_mds_session(session);
5659 mutex_lock(&mdsc->mutex);
5660 }
5661 mutex_unlock(&mdsc->mutex);
5662
5663 doutc(cl, "waiting for sessions to close\n");
5664 wait_event_timeout(mdsc->session_close_wq,
5665 done_closing_sessions(mdsc, skipped),
5666 ceph_timeout_jiffies(opts->mount_timeout));
5667
5668 /* tear down remaining sessions */
5669 mutex_lock(&mdsc->mutex);
5670 for (i = 0; i < mdsc->max_sessions; i++) {
5671 if (mdsc->sessions[i]) {
5672 session = ceph_get_mds_session(mdsc->sessions[i]);
5673 __unregister_session(mdsc, session);
5674 mutex_unlock(&mdsc->mutex);
5675 mutex_lock(&session->s_mutex);
5676 remove_session_caps(session);
5677 mutex_unlock(&session->s_mutex);
5678 ceph_put_mds_session(session);
5679 mutex_lock(&mdsc->mutex);
5680 }
5681 }
5682 WARN_ON(!list_empty(&mdsc->cap_delay_list));
5683 mutex_unlock(&mdsc->mutex);
5684
5685 ceph_cleanup_snapid_map(mdsc);
5686 ceph_cleanup_global_and_empty_realms(mdsc);
5687
5688 cancel_work_sync(&mdsc->cap_reclaim_work);
5689 cancel_work_sync(&mdsc->cap_unlink_work);
5690 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
5691
5692 doutc(cl, "done\n");
5693}
5694
5695void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
5696{
5697 struct ceph_mds_session *session;
5698 int mds;
5699
5700 doutc(mdsc->fsc->client, "force umount\n");
5701
5702 mutex_lock(&mdsc->mutex);
5703 for (mds = 0; mds < mdsc->max_sessions; mds++) {
5704 session = __ceph_lookup_mds_session(mdsc, mds);
5705 if (!session)
5706 continue;
5707
5708 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
5709 __unregister_session(mdsc, session);
5710 __wake_requests(mdsc, &session->s_waiting);
5711 mutex_unlock(&mdsc->mutex);
5712
5713 mutex_lock(&session->s_mutex);
5714 __close_session(mdsc, session);
5715 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
5716 cleanup_session_requests(mdsc, session);
5717 remove_session_caps(session);
5718 }
5719 mutex_unlock(&session->s_mutex);
5720 ceph_put_mds_session(session);
5721
5722 mutex_lock(&mdsc->mutex);
5723 kick_requests(mdsc, mds);
5724 }
5725 __wake_requests(mdsc, &mdsc->waiting_for_map);
5726 mutex_unlock(&mdsc->mutex);
5727}
5728
5729static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
5730{
5731 doutc(mdsc->fsc->client, "stop\n");
5732 /*
5733 * Make sure the delayed work stopped before releasing
5734 * the resources.
5735 *
5736 * Because the cancel_delayed_work_sync() will only
5737 * guarantee that the work finishes executing. But the
5738 * delayed work will re-arm itself again after that.
5739 */
5740 flush_delayed_work(&mdsc->delayed_work);
5741
5742 if (mdsc->mdsmap)
5743 ceph_mdsmap_destroy(mdsc->mdsmap);
5744 kfree(mdsc->sessions);
5745 ceph_caps_finalize(mdsc);
5746 ceph_pool_perm_destroy(mdsc);
5747}
5748
5749void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
5750{
5751 struct ceph_mds_client *mdsc = fsc->mdsc;
5752 doutc(fsc->client, "%p\n", mdsc);
5753
5754 if (!mdsc)
5755 return;
5756
5757 /* flush out any connection work with references to us */
5758 ceph_msgr_flush();
5759
5760 ceph_mdsc_stop(mdsc);
5761
5762 ceph_metric_destroy(&mdsc->metric);
5763
5764 fsc->mdsc = NULL;
5765 kfree(mdsc);
5766 doutc(fsc->client, "%p done\n", mdsc);
5767}
5768
5769void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
5770{
5771 struct ceph_fs_client *fsc = mdsc->fsc;
5772 struct ceph_client *cl = fsc->client;
5773 const char *mds_namespace = fsc->mount_options->mds_namespace;
5774 void *p = msg->front.iov_base;
5775 void *end = p + msg->front.iov_len;
5776 u32 epoch;
5777 u32 num_fs;
5778 u32 mount_fscid = (u32)-1;
5779 int err = -EINVAL;
5780
5781 ceph_decode_need(&p, end, sizeof(u32), bad);
5782 epoch = ceph_decode_32(&p);
5783
5784 doutc(cl, "epoch %u\n", epoch);
5785
5786 /* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */
5787 ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad);
5788
5789 ceph_decode_32_safe(&p, end, num_fs, bad);
5790 while (num_fs-- > 0) {
5791 void *info_p, *info_end;
5792 u32 info_len;
5793 u32 fscid, namelen;
5794
5795 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
5796 p += 2; // info_v, info_cv
5797 info_len = ceph_decode_32(&p);
5798 ceph_decode_need(&p, end, info_len, bad);
5799 info_p = p;
5800 info_end = p + info_len;
5801 p = info_end;
5802
5803 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
5804 fscid = ceph_decode_32(&info_p);
5805 namelen = ceph_decode_32(&info_p);
5806 ceph_decode_need(&info_p, info_end, namelen, bad);
5807
5808 if (mds_namespace &&
5809 strlen(mds_namespace) == namelen &&
5810 !strncmp(mds_namespace, (char *)info_p, namelen)) {
5811 mount_fscid = fscid;
5812 break;
5813 }
5814 }
5815
5816 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
5817 if (mount_fscid != (u32)-1) {
5818 fsc->client->monc.fs_cluster_id = mount_fscid;
5819 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
5820 0, true);
5821 ceph_monc_renew_subs(&fsc->client->monc);
5822 } else {
5823 err = -ENOENT;
5824 goto err_out;
5825 }
5826 return;
5827
5828bad:
5829 pr_err_client(cl, "error decoding fsmap %d. Shutting down mount.\n",
5830 err);
5831 ceph_umount_begin(mdsc->fsc->sb);
5832 ceph_msg_dump(msg);
5833err_out:
5834 mutex_lock(&mdsc->mutex);
5835 mdsc->mdsmap_err = err;
5836 __wake_requests(mdsc, &mdsc->waiting_for_map);
5837 mutex_unlock(&mdsc->mutex);
5838}
5839
5840/*
5841 * handle mds map update.
5842 */
5843void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
5844{
5845 struct ceph_client *cl = mdsc->fsc->client;
5846 u32 epoch;
5847 u32 maplen;
5848 void *p = msg->front.iov_base;
5849 void *end = p + msg->front.iov_len;
5850 struct ceph_mdsmap *newmap, *oldmap;
5851 struct ceph_fsid fsid;
5852 int err = -EINVAL;
5853
5854 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
5855 ceph_decode_copy(&p, &fsid, sizeof(fsid));
5856 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
5857 return;
5858 epoch = ceph_decode_32(&p);
5859 maplen = ceph_decode_32(&p);
5860 doutc(cl, "epoch %u len %d\n", epoch, (int)maplen);
5861
5862 /* do we need it? */
5863 mutex_lock(&mdsc->mutex);
5864 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
5865 doutc(cl, "epoch %u <= our %u\n", epoch, mdsc->mdsmap->m_epoch);
5866 mutex_unlock(&mdsc->mutex);
5867 return;
5868 }
5869
5870 newmap = ceph_mdsmap_decode(mdsc, &p, end, ceph_msgr2(mdsc->fsc->client));
5871 if (IS_ERR(newmap)) {
5872 err = PTR_ERR(newmap);
5873 goto bad_unlock;
5874 }
5875
5876 /* swap into place */
5877 if (mdsc->mdsmap) {
5878 oldmap = mdsc->mdsmap;
5879 mdsc->mdsmap = newmap;
5880 check_new_map(mdsc, newmap, oldmap);
5881 ceph_mdsmap_destroy(oldmap);
5882 } else {
5883 mdsc->mdsmap = newmap; /* first mds map */
5884 }
5885 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
5886 MAX_LFS_FILESIZE);
5887
5888 __wake_requests(mdsc, &mdsc->waiting_for_map);
5889 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
5890 mdsc->mdsmap->m_epoch);
5891
5892 mutex_unlock(&mdsc->mutex);
5893 schedule_delayed(mdsc, 0);
5894 return;
5895
5896bad_unlock:
5897 mutex_unlock(&mdsc->mutex);
5898bad:
5899 pr_err_client(cl, "error decoding mdsmap %d. Shutting down mount.\n",
5900 err);
5901 ceph_umount_begin(mdsc->fsc->sb);
5902 ceph_msg_dump(msg);
5903 return;
5904}
5905
5906static struct ceph_connection *mds_get_con(struct ceph_connection *con)
5907{
5908 struct ceph_mds_session *s = con->private;
5909
5910 if (ceph_get_mds_session(s))
5911 return con;
5912 return NULL;
5913}
5914
5915static void mds_put_con(struct ceph_connection *con)
5916{
5917 struct ceph_mds_session *s = con->private;
5918
5919 ceph_put_mds_session(s);
5920}
5921
5922/*
5923 * if the client is unresponsive for long enough, the mds will kill
5924 * the session entirely.
5925 */
5926static void mds_peer_reset(struct ceph_connection *con)
5927{
5928 struct ceph_mds_session *s = con->private;
5929 struct ceph_mds_client *mdsc = s->s_mdsc;
5930
5931 pr_warn_client(mdsc->fsc->client, "mds%d closed our session\n",
5932 s->s_mds);
5933 if (READ_ONCE(mdsc->fsc->mount_state) != CEPH_MOUNT_FENCE_IO &&
5934 ceph_mdsmap_get_state(mdsc->mdsmap, s->s_mds) >= CEPH_MDS_STATE_RECONNECT)
5935 send_mds_reconnect(mdsc, s);
5936}
5937
5938static void mds_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
5939{
5940 struct ceph_mds_session *s = con->private;
5941 struct ceph_mds_client *mdsc = s->s_mdsc;
5942 struct ceph_client *cl = mdsc->fsc->client;
5943 int type = le16_to_cpu(msg->hdr.type);
5944
5945 mutex_lock(&mdsc->mutex);
5946 if (__verify_registered_session(mdsc, s) < 0) {
5947 mutex_unlock(&mdsc->mutex);
5948 goto out;
5949 }
5950 mutex_unlock(&mdsc->mutex);
5951
5952 switch (type) {
5953 case CEPH_MSG_MDS_MAP:
5954 ceph_mdsc_handle_mdsmap(mdsc, msg);
5955 break;
5956 case CEPH_MSG_FS_MAP_USER:
5957 ceph_mdsc_handle_fsmap(mdsc, msg);
5958 break;
5959 case CEPH_MSG_CLIENT_SESSION:
5960 handle_session(s, msg);
5961 break;
5962 case CEPH_MSG_CLIENT_REPLY:
5963 handle_reply(s, msg);
5964 break;
5965 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
5966 handle_forward(mdsc, s, msg);
5967 break;
5968 case CEPH_MSG_CLIENT_CAPS:
5969 ceph_handle_caps(s, msg);
5970 break;
5971 case CEPH_MSG_CLIENT_SNAP:
5972 ceph_handle_snap(mdsc, s, msg);
5973 break;
5974 case CEPH_MSG_CLIENT_LEASE:
5975 handle_lease(mdsc, s, msg);
5976 break;
5977 case CEPH_MSG_CLIENT_QUOTA:
5978 ceph_handle_quota(mdsc, s, msg);
5979 break;
5980
5981 default:
5982 pr_err_client(cl, "received unknown message type %d %s\n",
5983 type, ceph_msg_type_name(type));
5984 }
5985out:
5986 ceph_msg_put(msg);
5987}
5988
5989/*
5990 * authentication
5991 */
5992
5993/*
5994 * Note: returned pointer is the address of a structure that's
5995 * managed separately. Caller must *not* attempt to free it.
5996 */
5997static struct ceph_auth_handshake *
5998mds_get_authorizer(struct ceph_connection *con, int *proto, int force_new)
5999{
6000 struct ceph_mds_session *s = con->private;
6001 struct ceph_mds_client *mdsc = s->s_mdsc;
6002 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
6003 struct ceph_auth_handshake *auth = &s->s_auth;
6004 int ret;
6005
6006 ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
6007 force_new, proto, NULL, NULL);
6008 if (ret)
6009 return ERR_PTR(ret);
6010
6011 return auth;
6012}
6013
6014static int mds_add_authorizer_challenge(struct ceph_connection *con,
6015 void *challenge_buf, int challenge_buf_len)
6016{
6017 struct ceph_mds_session *s = con->private;
6018 struct ceph_mds_client *mdsc = s->s_mdsc;
6019 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
6020
6021 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
6022 challenge_buf, challenge_buf_len);
6023}
6024
6025static int mds_verify_authorizer_reply(struct ceph_connection *con)
6026{
6027 struct ceph_mds_session *s = con->private;
6028 struct ceph_mds_client *mdsc = s->s_mdsc;
6029 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
6030 struct ceph_auth_handshake *auth = &s->s_auth;
6031
6032 return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
6033 auth->authorizer_reply_buf, auth->authorizer_reply_buf_len,
6034 NULL, NULL, NULL, NULL);
6035}
6036
6037static int mds_invalidate_authorizer(struct ceph_connection *con)
6038{
6039 struct ceph_mds_session *s = con->private;
6040 struct ceph_mds_client *mdsc = s->s_mdsc;
6041 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
6042
6043 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
6044
6045 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
6046}
6047
6048static int mds_get_auth_request(struct ceph_connection *con,
6049 void *buf, int *buf_len,
6050 void **authorizer, int *authorizer_len)
6051{
6052 struct ceph_mds_session *s = con->private;
6053 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6054 struct ceph_auth_handshake *auth = &s->s_auth;
6055 int ret;
6056
6057 ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
6058 buf, buf_len);
6059 if (ret)
6060 return ret;
6061
6062 *authorizer = auth->authorizer_buf;
6063 *authorizer_len = auth->authorizer_buf_len;
6064 return 0;
6065}
6066
6067static int mds_handle_auth_reply_more(struct ceph_connection *con,
6068 void *reply, int reply_len,
6069 void *buf, int *buf_len,
6070 void **authorizer, int *authorizer_len)
6071{
6072 struct ceph_mds_session *s = con->private;
6073 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6074 struct ceph_auth_handshake *auth = &s->s_auth;
6075 int ret;
6076
6077 ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len,
6078 buf, buf_len);
6079 if (ret)
6080 return ret;
6081
6082 *authorizer = auth->authorizer_buf;
6083 *authorizer_len = auth->authorizer_buf_len;
6084 return 0;
6085}
6086
6087static int mds_handle_auth_done(struct ceph_connection *con,
6088 u64 global_id, void *reply, int reply_len,
6089 u8 *session_key, int *session_key_len,
6090 u8 *con_secret, int *con_secret_len)
6091{
6092 struct ceph_mds_session *s = con->private;
6093 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6094 struct ceph_auth_handshake *auth = &s->s_auth;
6095
6096 return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len,
6097 session_key, session_key_len,
6098 con_secret, con_secret_len);
6099}
6100
6101static int mds_handle_auth_bad_method(struct ceph_connection *con,
6102 int used_proto, int result,
6103 const int *allowed_protos, int proto_cnt,
6104 const int *allowed_modes, int mode_cnt)
6105{
6106 struct ceph_mds_session *s = con->private;
6107 struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc;
6108 int ret;
6109
6110 if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS,
6111 used_proto, result,
6112 allowed_protos, proto_cnt,
6113 allowed_modes, mode_cnt)) {
6114 ret = ceph_monc_validate_auth(monc);
6115 if (ret)
6116 return ret;
6117 }
6118
6119 return -EACCES;
6120}
6121
6122static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
6123 struct ceph_msg_header *hdr, int *skip)
6124{
6125 struct ceph_msg *msg;
6126 int type = (int) le16_to_cpu(hdr->type);
6127 int front_len = (int) le32_to_cpu(hdr->front_len);
6128
6129 if (con->in_msg)
6130 return con->in_msg;
6131
6132 *skip = 0;
6133 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
6134 if (!msg) {
6135 pr_err("unable to allocate msg type %d len %d\n",
6136 type, front_len);
6137 return NULL;
6138 }
6139
6140 return msg;
6141}
6142
6143static int mds_sign_message(struct ceph_msg *msg)
6144{
6145 struct ceph_mds_session *s = msg->con->private;
6146 struct ceph_auth_handshake *auth = &s->s_auth;
6147
6148 return ceph_auth_sign_message(auth, msg);
6149}
6150
6151static int mds_check_message_signature(struct ceph_msg *msg)
6152{
6153 struct ceph_mds_session *s = msg->con->private;
6154 struct ceph_auth_handshake *auth = &s->s_auth;
6155
6156 return ceph_auth_check_message_signature(auth, msg);
6157}
6158
6159static const struct ceph_connection_operations mds_con_ops = {
6160 .get = mds_get_con,
6161 .put = mds_put_con,
6162 .alloc_msg = mds_alloc_msg,
6163 .dispatch = mds_dispatch,
6164 .peer_reset = mds_peer_reset,
6165 .get_authorizer = mds_get_authorizer,
6166 .add_authorizer_challenge = mds_add_authorizer_challenge,
6167 .verify_authorizer_reply = mds_verify_authorizer_reply,
6168 .invalidate_authorizer = mds_invalidate_authorizer,
6169 .sign_message = mds_sign_message,
6170 .check_message_signature = mds_check_message_signature,
6171 .get_auth_request = mds_get_auth_request,
6172 .handle_auth_reply_more = mds_handle_auth_reply_more,
6173 .handle_auth_done = mds_handle_auth_done,
6174 .handle_auth_bad_method = mds_handle_auth_bad_method,
6175};
6176
6177/* eof */