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libceph: fix a use after free issue in osdmap_set_max_osd
[mirror_ubuntu-bionic-kernel.git] / fs / ceph / mds_client.c
CommitLineData
3d14c5d2 1#include <linux/ceph/ceph_debug.h>
2f2dc053 2
496e5955 3#include <linux/fs.h>
2f2dc053 4#include <linux/wait.h>
5a0e3ad6 5#include <linux/slab.h>
54008399 6#include <linux/gfp.h>
2f2dc053 7#include <linux/sched.h>
3d14c5d2
YS		 8#include <linux/debugfs.h>
9#include <linux/seq_file.h>
2f2dc053 10
2f2dc053 11#include "super.h"
3d14c5d2
YS		 12#include "mds_client.h"
13
1fe60e51 14#include <linux/ceph/ceph_features.h>
3d14c5d2
YS		 15#include <linux/ceph/messenger.h>
16#include <linux/ceph/decode.h>
17#include <linux/ceph/pagelist.h>
18#include <linux/ceph/auth.h>
19#include <linux/ceph/debugfs.h>
2f2dc053
SW		 20
21/*
22 * A cluster of MDS (metadata server) daemons is responsible for
23 * managing the file system namespace (the directory hierarchy and
24 * inodes) and for coordinating shared access to storage. Metadata is
25 * partitioning hierarchically across a number of servers, and that
26 * partition varies over time as the cluster adjusts the distribution
27 * in order to balance load.
28 *
29 * The MDS client is primarily responsible to managing synchronous
30 * metadata requests for operations like open, unlink, and so forth.
31 * If there is a MDS failure, we find out about it when we (possibly
32 * request and) receive a new MDS map, and can resubmit affected
33 * requests.
34 *
35 * For the most part, though, we take advantage of a lossless
36 * communications channel to the MDS, and do not need to worry about
37 * timing out or resubmitting requests.
38 *
39 * We maintain a stateful "session" with each MDS we interact with.
40 * Within each session, we sent periodic heartbeat messages to ensure
41 * any capabilities or leases we have been issues remain valid. If
42 * the session times out and goes stale, our leases and capabilities
43 * are no longer valid.
44 */
45
20cb34ae 46struct ceph_reconnect_state {
44c99757 47 int nr_caps;
20cb34ae
SW		 48 struct ceph_pagelist *pagelist;
49 bool flock;
50};
51
2f2dc053
SW		 52static void __wake_requests(struct ceph_mds_client *mdsc,
53 struct list_head *head);
54
9e32789f 55static const struct ceph_connection_operations mds_con_ops;
2f2dc053
SW		 56
57
58/*
59 * mds reply parsing
60 */
61
62/*
63 * parse individual inode info
64 */
65static int parse_reply_info_in(void **p, void *end,
14303d20 66 struct ceph_mds_reply_info_in *info,
12b4629a 67 u64 features)
2f2dc053
SW		 68{
69 int err = -EIO;
70
71 info->in = *p;
72 *p += sizeof(struct ceph_mds_reply_inode) +
73 sizeof(*info->in->fragtree.splits) *
74 le32_to_cpu(info->in->fragtree.nsplits);
75
76 ceph_decode_32_safe(p, end, info->symlink_len, bad);
77 ceph_decode_need(p, end, info->symlink_len, bad);
78 info->symlink = *p;
79 *p += info->symlink_len;
80
14303d20
SW		 81 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
82 ceph_decode_copy_safe(p, end, &info->dir_layout,
83 sizeof(info->dir_layout), bad);
84 else
85 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
86
2f2dc053
SW		 87 ceph_decode_32_safe(p, end, info->xattr_len, bad);
88 ceph_decode_need(p, end, info->xattr_len, bad);
89 info->xattr_data = *p;
90 *p += info->xattr_len;
91 return 0;
92bad:
93 return err;
94}
95
96/*
97 * parse a normal reply, which may contain a (dir+)dentry and/or a
98 * target inode.
99 */
100static int parse_reply_info_trace(void **p, void *end,
14303d20 101 struct ceph_mds_reply_info_parsed *info,
12b4629a 102 u64 features)
2f2dc053
SW		 103{
104 int err;
105
106 if (info->head->is_dentry) {
14303d20 107 err = parse_reply_info_in(p, end, &info->diri, features);
2f2dc053
SW		 108 if (err < 0)
109 goto out_bad;
110
111 if (unlikely(*p + sizeof(*info->dirfrag) > end))
112 goto bad;
113 info->dirfrag = *p;
114 *p += sizeof(*info->dirfrag) +
115 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
116 if (unlikely(*p > end))
117 goto bad;
118
119 ceph_decode_32_safe(p, end, info->dname_len, bad);
120 ceph_decode_need(p, end, info->dname_len, bad);
121 info->dname = *p;
122 *p += info->dname_len;
123 info->dlease = *p;
124 *p += sizeof(*info->dlease);
125 }
126
127 if (info->head->is_target) {
14303d20 128 err = parse_reply_info_in(p, end, &info->targeti, features);
2f2dc053
SW		 129 if (err < 0)
130 goto out_bad;
131 }
132
133 if (unlikely(*p != end))
134 goto bad;
135 return 0;
136
137bad:
138 err = -EIO;
139out_bad:
140 pr_err("problem parsing mds trace %d\n", err);
141 return err;
142}
143
144/*
145 * parse readdir results
146 */
147static int parse_reply_info_dir(void **p, void *end,
14303d20 148 struct ceph_mds_reply_info_parsed *info,
12b4629a 149 u64 features)
2f2dc053
SW		 150{
151 u32 num, i = 0;
152 int err;
153
154 info->dir_dir = *p;
155 if (*p + sizeof(*info->dir_dir) > end)
156 goto bad;
157 *p += sizeof(*info->dir_dir) +
158 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
159 if (*p > end)
160 goto bad;
161
162 ceph_decode_need(p, end, sizeof(num) + 2, bad);
c89136ea
SW		 163 num = ceph_decode_32(p);
164 info->dir_end = ceph_decode_8(p);
165 info->dir_complete = ceph_decode_8(p);
2f2dc053
SW		 166 if (num == 0)
167 goto done;
168
54008399 169 BUG_ON(!info->dir_in);
2f2dc053
SW		 170 info->dir_dname = (void *)(info->dir_in + num);
171 info->dir_dname_len = (void *)(info->dir_dname + num);
172 info->dir_dlease = (void *)(info->dir_dname_len + num);
54008399
YZ		 173 if ((unsigned long)(info->dir_dlease + num) >
174 (unsigned long)info->dir_in + info->dir_buf_size) {
175 pr_err("dir contents are larger than expected\n");
176 WARN_ON(1);
177 goto bad;
178 }
2f2dc053 179
54008399 180 info->dir_nr = num;
2f2dc053
SW		 181 while (num) {
182 /* dentry */
183 ceph_decode_need(p, end, sizeof(u32)*2, bad);
c89136ea 184 info->dir_dname_len[i] = ceph_decode_32(p);
2f2dc053
SW		 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 */
14303d20 194 err = parse_reply_info_in(p, end, &info->dir_in[i], features);
2f2dc053
SW		 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
25933abd
HS		 213/*
214 * parse fcntl F_GETLK results
215 */
216static int parse_reply_info_filelock(void **p, void *end,
14303d20 217 struct ceph_mds_reply_info_parsed *info,
12b4629a 218 u64 features)
25933abd
HS		 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
6e8575fa
SL		 234/*
235 * parse create results
236 */
237static int parse_reply_info_create(void **p, void *end,
238 struct ceph_mds_reply_info_parsed *info,
12b4629a 239 u64 features)
6e8575fa
SL		 240{
241 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
242 if (*p == end) {
243 info->has_create_ino = false;
244 } else {
245 info->has_create_ino = true;
246 info->ino = ceph_decode_64(p);
247 }
248 }
249
250 if (unlikely(*p != end))
251 goto bad;
252 return 0;
253
254bad:
255 return -EIO;
256}
257
25933abd
HS		 258/*
259 * parse extra results
260 */
261static int parse_reply_info_extra(void **p, void *end,
14303d20 262 struct ceph_mds_reply_info_parsed *info,
12b4629a 263 u64 features)
25933abd
HS		 264{
265 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
14303d20 266 return parse_reply_info_filelock(p, end, info, features);
8a034497
YZ		 267 else if (info->head->op == CEPH_MDS_OP_READDIR ||
268 info->head->op == CEPH_MDS_OP_LSSNAP)
14303d20 269 return parse_reply_info_dir(p, end, info, features);
6e8575fa
SL		 270 else if (info->head->op == CEPH_MDS_OP_CREATE)
271 return parse_reply_info_create(p, end, info, features);
272 else
273 return -EIO;
25933abd
HS		 274}
275
2f2dc053
SW		 276/*
277 * parse entire mds reply
278 */
279static int parse_reply_info(struct ceph_msg *msg,
14303d20 280 struct ceph_mds_reply_info_parsed *info,
12b4629a 281 u64 features)
2f2dc053
SW		 282{
283 void *p, *end;
284 u32 len;
285 int err;
286
287 info->head = msg->front.iov_base;
288 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
289 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
290
291 /* trace */
292 ceph_decode_32_safe(&p, end, len, bad);
293 if (len > 0) {
32852a81 294 ceph_decode_need(&p, end, len, bad);
14303d20 295 err = parse_reply_info_trace(&p, p+len, info, features);
2f2dc053
SW		 296 if (err < 0)
297 goto out_bad;
298 }
299
25933abd 300 /* extra */
2f2dc053
SW		 301 ceph_decode_32_safe(&p, end, len, bad);
302 if (len > 0) {
32852a81 303 ceph_decode_need(&p, end, len, bad);
14303d20 304 err = parse_reply_info_extra(&p, p+len, info, features);
2f2dc053
SW		 305 if (err < 0)
306 goto out_bad;
307 }
308
309 /* snap blob */
310 ceph_decode_32_safe(&p, end, len, bad);
311 info->snapblob_len = len;
312 info->snapblob = p;
313 p += len;
314
315 if (p != end)
316 goto bad;
317 return 0;
318
319bad:
320 err = -EIO;
321out_bad:
322 pr_err("mds parse_reply err %d\n", err);
323 return err;
324}
325
326static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
327{
54008399
YZ		 328 if (!info->dir_in)
329 return;
330 free_pages((unsigned long)info->dir_in, get_order(info->dir_buf_size));
2f2dc053
SW		 331}
332
333
334/*
335 * sessions
336 */
337static const char *session_state_name(int s)
338{
339 switch (s) {
340 case CEPH_MDS_SESSION_NEW: return "new";
341 case CEPH_MDS_SESSION_OPENING: return "opening";
342 case CEPH_MDS_SESSION_OPEN: return "open";
343 case CEPH_MDS_SESSION_HUNG: return "hung";
344 case CEPH_MDS_SESSION_CLOSING: return "closing";
44ca18f2 345 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
2f2dc053
SW		 346 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
347 default: return "???";
348 }
349}
350
351static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
352{
353 if (atomic_inc_not_zero(&s->s_ref)) {
354 dout("mdsc get_session %p %d -> %d\n", s,
355 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
356 return s;
357 } else {
358 dout("mdsc get_session %p 0 -- FAIL", s);
359 return NULL;
360 }
361}
362
363void ceph_put_mds_session(struct ceph_mds_session *s)
364{
365 dout("mdsc put_session %p %d -> %d\n", s,
366 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
4e7a5dcd 367 if (atomic_dec_and_test(&s->s_ref)) {
6c4a1915 368 if (s->s_auth.authorizer)
27859f97
SW		 369 ceph_auth_destroy_authorizer(
370 s->s_mdsc->fsc->client->monc.auth,
371 s->s_auth.authorizer);
2f2dc053 372 kfree(s);
4e7a5dcd 373 }
2f2dc053
SW		 374}
375
376/*
377 * called under mdsc->mutex
378 */
379struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
380 int mds)
381{
382 struct ceph_mds_session *session;
383
384 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
385 return NULL;
386 session = mdsc->sessions[mds];
387 dout("lookup_mds_session %p %d\n", session,
388 atomic_read(&session->s_ref));
389 get_session(session);
390 return session;
391}
392
393static bool __have_session(struct ceph_mds_client *mdsc, int mds)
394{
395 if (mds >= mdsc->max_sessions)
396 return false;
397 return mdsc->sessions[mds];
398}
399
2600d2dd
SW		 400static int __verify_registered_session(struct ceph_mds_client *mdsc,
401 struct ceph_mds_session *s)
402{
403 if (s->s_mds >= mdsc->max_sessions ||
404 mdsc->sessions[s->s_mds] != s)
405 return -ENOENT;
406 return 0;
407}
408
2f2dc053
SW		 409/*
410 * create+register a new session for given mds.
411 * called under mdsc->mutex.
412 */
413static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
414 int mds)
415{
416 struct ceph_mds_session *s;
417
c338c07c
NY		 418 if (mds >= mdsc->mdsmap->m_max_mds)
419 return ERR_PTR(-EINVAL);
420
2f2dc053 421 s = kzalloc(sizeof(*s), GFP_NOFS);
4736b009
DC		 422 if (!s)
423 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 424 s->s_mdsc = mdsc;
425 s->s_mds = mds;
426 s->s_state = CEPH_MDS_SESSION_NEW;
427 s->s_ttl = 0;
428 s->s_seq = 0;
429 mutex_init(&s->s_mutex);
430
b7a9e5dd 431 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
2f2dc053 432
d8fb02ab 433 spin_lock_init(&s->s_gen_ttl_lock);
2f2dc053 434 s->s_cap_gen = 0;
1ce208a6 435 s->s_cap_ttl = jiffies - 1;
d8fb02ab
AE		 436
437 spin_lock_init(&s->s_cap_lock);
2f2dc053
SW		 438 s->s_renew_requested = 0;
439 s->s_renew_seq = 0;
440 INIT_LIST_HEAD(&s->s_caps);
441 s->s_nr_caps = 0;
5dacf091 442 s->s_trim_caps = 0;
2f2dc053
SW		 443 atomic_set(&s->s_ref, 1);
444 INIT_LIST_HEAD(&s->s_waiting);
445 INIT_LIST_HEAD(&s->s_unsafe);
446 s->s_num_cap_releases = 0;
99a9c273 447 s->s_cap_reconnect = 0;
7c1332b8 448 s->s_cap_iterator = NULL;
2f2dc053
SW		 449 INIT_LIST_HEAD(&s->s_cap_releases);
450 INIT_LIST_HEAD(&s->s_cap_releases_done);
451 INIT_LIST_HEAD(&s->s_cap_flushing);
452 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
453
454 dout("register_session mds%d\n", mds);
455 if (mds >= mdsc->max_sessions) {
456 int newmax = 1 << get_count_order(mds+1);
457 struct ceph_mds_session **sa;
458
459 dout("register_session realloc to %d\n", newmax);
460 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
461 if (sa == NULL)
42ce56e5 462 goto fail_realloc;
2f2dc053
SW		 463 if (mdsc->sessions) {
464 memcpy(sa, mdsc->sessions,
465 mdsc->max_sessions * sizeof(void *));
466 kfree(mdsc->sessions);
467 }
468 mdsc->sessions = sa;
469 mdsc->max_sessions = newmax;
470 }
471 mdsc->sessions[mds] = s;
472 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
42ce56e5 473
b7a9e5dd
SW		 474 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
475 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
42ce56e5 476
2f2dc053 477 return s;
42ce56e5
SW		 478
479fail_realloc:
480 kfree(s);
481 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 482}
483
484/*
485 * called under mdsc->mutex
486 */
2600d2dd 487static void __unregister_session(struct ceph_mds_client *mdsc,
42ce56e5 488 struct ceph_mds_session *s)
2f2dc053 489{
2600d2dd
SW		 490 dout("__unregister_session mds%d %p\n", s->s_mds, s);
491 BUG_ON(mdsc->sessions[s->s_mds] != s);
42ce56e5
SW		 492 mdsc->sessions[s->s_mds] = NULL;
493 ceph_con_close(&s->s_con);
494 ceph_put_mds_session(s);
2f2dc053
SW		 495}
496
497/*
498 * drop session refs in request.
499 *
500 * should be last request ref, or hold mdsc->mutex
501 */
502static void put_request_session(struct ceph_mds_request *req)
503{
504 if (req->r_session) {
505 ceph_put_mds_session(req->r_session);
506 req->r_session = NULL;
507 }
508}
509
153c8e6b 510void ceph_mdsc_release_request(struct kref *kref)
2f2dc053 511{
153c8e6b
SW		 512 struct ceph_mds_request *req = container_of(kref,
513 struct ceph_mds_request,
514 r_kref);
54008399 515 destroy_reply_info(&req->r_reply_info);
153c8e6b
SW		 516 if (req->r_request)
517 ceph_msg_put(req->r_request);
54008399 518 if (req->r_reply)
153c8e6b 519 ceph_msg_put(req->r_reply);
153c8e6b 520 if (req->r_inode) {
41b02e1f 521 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
153c8e6b
SW		 522 iput(req->r_inode);
523 }
524 if (req->r_locked_dir)
41b02e1f 525 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
153c8e6b
SW		 526 if (req->r_target_inode)
527 iput(req->r_target_inode);
528 if (req->r_dentry)
529 dput(req->r_dentry);
844d87c3
SW		 530 if (req->r_old_dentry)
531 dput(req->r_old_dentry);
532 if (req->r_old_dentry_dir) {
41b02e1f
SW		 533 /*
534 * track (and drop pins for) r_old_dentry_dir
535 * separately, since r_old_dentry's d_parent may have
536 * changed between the dir mutex being dropped and
537 * this request being freed.
538 */
539 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
540 CEPH_CAP_PIN);
41b02e1f 541 iput(req->r_old_dentry_dir);
2f2dc053 542 }
153c8e6b
SW		 543 kfree(req->r_path1);
544 kfree(req->r_path2);
545 put_request_session(req);
37151668 546 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
153c8e6b 547 kfree(req);
2f2dc053
SW		 548}
549
550/*
551 * lookup session, bump ref if found.
552 *
553 * called under mdsc->mutex.
554 */
555static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
556 u64 tid)
557{
558 struct ceph_mds_request *req;
44ca18f2
SW		 559 struct rb_node *n = mdsc->request_tree.rb_node;
560
561 while (n) {
562 req = rb_entry(n, struct ceph_mds_request, r_node);
563 if (tid < req->r_tid)
564 n = n->rb_left;
565 else if (tid > req->r_tid)
566 n = n->rb_right;
567 else {
568 ceph_mdsc_get_request(req);
569 return req;
570 }
571 }
572 return NULL;
573}
574
575static void __insert_request(struct ceph_mds_client *mdsc,
576 struct ceph_mds_request *new)
577{
578 struct rb_node **p = &mdsc->request_tree.rb_node;
579 struct rb_node *parent = NULL;
580 struct ceph_mds_request *req = NULL;
581
582 while (*p) {
583 parent = *p;
584 req = rb_entry(parent, struct ceph_mds_request, r_node);
585 if (new->r_tid < req->r_tid)
586 p = &(*p)->rb_left;
587 else if (new->r_tid > req->r_tid)
588 p = &(*p)->rb_right;
589 else
590 BUG();
591 }
592
593 rb_link_node(&new->r_node, parent, p);
594 rb_insert_color(&new->r_node, &mdsc->request_tree);
2f2dc053
SW		 595}
596
597/*
598 * Register an in-flight request, and assign a tid. Link to directory
599 * are modifying (if any).
600 *
601 * Called under mdsc->mutex.
602 */
603static void __register_request(struct ceph_mds_client *mdsc,
604 struct ceph_mds_request *req,
605 struct inode *dir)
606{
607 req->r_tid = ++mdsc->last_tid;
608 if (req->r_num_caps)
37151668
YS		 609 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
610 req->r_num_caps);
2f2dc053
SW		 611 dout("__register_request %p tid %lld\n", req, req->r_tid);
612 ceph_mdsc_get_request(req);
44ca18f2 613 __insert_request(mdsc, req);
2f2dc053 614
cb4276cc
SW		 615 req->r_uid = current_fsuid();
616 req->r_gid = current_fsgid();
617
2f2dc053
SW		 618 if (dir) {
619 struct ceph_inode_info *ci = ceph_inode(dir);
620
3b663780 621 ihold(dir);
2f2dc053
SW		 622 spin_lock(&ci->i_unsafe_lock);
623 req->r_unsafe_dir = dir;
624 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
625 spin_unlock(&ci->i_unsafe_lock);
626 }
627}
628
629static void __unregister_request(struct ceph_mds_client *mdsc,
630 struct ceph_mds_request *req)
631{
632 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
44ca18f2 633 rb_erase(&req->r_node, &mdsc->request_tree);
80fc7314 634 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 635
636 if (req->r_unsafe_dir) {
637 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
638
639 spin_lock(&ci->i_unsafe_lock);
640 list_del_init(&req->r_unsafe_dir_item);
641 spin_unlock(&ci->i_unsafe_lock);
3b663780
SW		 642
643 iput(req->r_unsafe_dir);
644 req->r_unsafe_dir = NULL;
2f2dc053 645 }
94aa8ae1 646
fc55d2c9
YZ		 647 complete_all(&req->r_safe_completion);
648
94aa8ae1 649 ceph_mdsc_put_request(req);
2f2dc053
SW		 650}
651
652/*
653 * Choose mds to send request to next. If there is a hint set in the
654 * request (e.g., due to a prior forward hint from the mds), use that.
655 * Otherwise, consult frag tree and/or caps to identify the
656 * appropriate mds. If all else fails, choose randomly.
657 *
658 * Called under mdsc->mutex.
659 */
7fd7d101 660static struct dentry *get_nonsnap_parent(struct dentry *dentry)
eb6bb1c5 661{
d79698da
SW		 662 /*
663 * we don't need to worry about protecting the d_parent access
664 * here because we never renaming inside the snapped namespace
665 * except to resplice to another snapdir, and either the old or new
666 * result is a valid result.
667 */
eb6bb1c5
SW		 668 while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
669 dentry = dentry->d_parent;
670 return dentry;
671}
672
2f2dc053
SW		 673static int __choose_mds(struct ceph_mds_client *mdsc,
674 struct ceph_mds_request *req)
675{
676 struct inode *inode;
677 struct ceph_inode_info *ci;
678 struct ceph_cap *cap;
679 int mode = req->r_direct_mode;
680 int mds = -1;
681 u32 hash = req->r_direct_hash;
682 bool is_hash = req->r_direct_is_hash;
683
684 /*
685 * is there a specific mds we should try? ignore hint if we have
686 * no session and the mds is not up (active or recovering).
687 */
688 if (req->r_resend_mds >= 0 &&
689 (__have_session(mdsc, req->r_resend_mds) ||
690 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
691 dout("choose_mds using resend_mds mds%d\n",
692 req->r_resend_mds);
693 return req->r_resend_mds;
694 }
695
696 if (mode == USE_RANDOM_MDS)
697 goto random;
698
699 inode = NULL;
700 if (req->r_inode) {
701 inode = req->r_inode;
702 } else if (req->r_dentry) {
d79698da
SW		 703 /* ignore race with rename; old or new d_parent is okay */
704 struct dentry *parent = req->r_dentry->d_parent;
705 struct inode *dir = parent->d_inode;
eb6bb1c5 706
3d14c5d2 707 if (dir->i_sb != mdsc->fsc->sb) {
eb6bb1c5
SW		 708 /* not this fs! */
709 inode = req->r_dentry->d_inode;
710 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
711 /* direct snapped/virtual snapdir requests
712 * based on parent dir inode */
d79698da 713 struct dentry *dn = get_nonsnap_parent(parent);
eb6bb1c5
SW		 714 inode = dn->d_inode;
715 dout("__choose_mds using nonsnap parent %p\n", inode);
ca18bede 716 } else {
eb6bb1c5 717 /* dentry target */
2f2dc053 718 inode = req->r_dentry->d_inode;
ca18bede
YZ		 719 if (!inode || mode == USE_AUTH_MDS) {
720 /* dir + name */
721 inode = dir;
722 hash = ceph_dentry_hash(dir, req->r_dentry);
723 is_hash = true;
724 }
2f2dc053
SW		 725 }
726 }
eb6bb1c5 727
2f2dc053
SW		 728 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
729 (int)hash, mode);
730 if (!inode)
731 goto random;
732 ci = ceph_inode(inode);
733
734 if (is_hash && S_ISDIR(inode->i_mode)) {
735 struct ceph_inode_frag frag;
736 int found;
737
738 ceph_choose_frag(ci, hash, &frag, &found);
739 if (found) {
740 if (mode == USE_ANY_MDS && frag.ndist > 0) {
741 u8 r;
742
743 /* choose a random replica */
744 get_random_bytes(&r, 1);
745 r %= frag.ndist;
746 mds = frag.dist[r];
747 dout("choose_mds %p %llx.%llx "
748 "frag %u mds%d (%d/%d)\n",
749 inode, ceph_vinop(inode),
d66bbd44 750 frag.frag, mds,
2f2dc053 751 (int)r, frag.ndist);
d66bbd44
SW		 752 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
753 CEPH_MDS_STATE_ACTIVE)
754 return mds;
2f2dc053
SW		 755 }
756
757 /* since this file/dir wasn't known to be
758 * replicated, then we want to look for the
759 * authoritative mds. */
760 mode = USE_AUTH_MDS;
761 if (frag.mds >= 0) {
762 /* choose auth mds */
763 mds = frag.mds;
764 dout("choose_mds %p %llx.%llx "
765 "frag %u mds%d (auth)\n",
766 inode, ceph_vinop(inode), frag.frag, mds);
d66bbd44
SW		 767 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
768 CEPH_MDS_STATE_ACTIVE)
769 return mds;
2f2dc053
SW		 770 }
771 }
772 }
773
be655596 774 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 775 cap = NULL;
776 if (mode == USE_AUTH_MDS)
777 cap = ci->i_auth_cap;
778 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
779 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
780 if (!cap) {
be655596 781 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 782 goto random;
783 }
784 mds = cap->session->s_mds;
785 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
786 inode, ceph_vinop(inode), mds,
787 cap == ci->i_auth_cap ? "auth " : "", cap);
be655596 788 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 789 return mds;
790
791random:
792 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
793 dout("choose_mds chose random mds%d\n", mds);
794 return mds;
795}
796
797
798/*
799 * session messages
800 */
801static struct ceph_msg *create_session_msg(u32 op, u64 seq)
802{
803 struct ceph_msg *msg;
804 struct ceph_mds_session_head *h;
805
b61c2763
SW		 806 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
807 false);
a79832f2 808 if (!msg) {
2f2dc053 809 pr_err("create_session_msg ENOMEM creating msg\n");
a79832f2 810 return NULL;
2f2dc053
SW		 811 }
812 h = msg->front.iov_base;
813 h->op = cpu_to_le32(op);
814 h->seq = cpu_to_le64(seq);
815 return msg;
816}
817
818/*
819 * send session open request.
820 *
821 * called under mdsc->mutex
822 */
823static int __open_session(struct ceph_mds_client *mdsc,
824 struct ceph_mds_session *session)
825{
826 struct ceph_msg *msg;
827 int mstate;
828 int mds = session->s_mds;
2f2dc053
SW		 829
830 /* wait for mds to go active? */
831 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
832 dout("open_session to mds%d (%s)\n", mds,
833 ceph_mds_state_name(mstate));
834 session->s_state = CEPH_MDS_SESSION_OPENING;
835 session->s_renew_requested = jiffies;
836
837 /* send connect message */
838 msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq);
a79832f2
SW		 839 if (!msg)
840 return -ENOMEM;
2f2dc053 841 ceph_con_send(&session->s_con, msg);
2f2dc053
SW		 842 return 0;
843}
844
ed0552a1
SW		 845/*
846 * open sessions for any export targets for the given mds
847 *
848 * called under mdsc->mutex
849 */
5d72d13c
YZ		 850static struct ceph_mds_session *
851__open_export_target_session(struct ceph_mds_client *mdsc, int target)
852{
853 struct ceph_mds_session *session;
854
855 session = __ceph_lookup_mds_session(mdsc, target);
856 if (!session) {
857 session = register_session(mdsc, target);
858 if (IS_ERR(session))
859 return session;
860 }
861 if (session->s_state == CEPH_MDS_SESSION_NEW ||
862 session->s_state == CEPH_MDS_SESSION_CLOSING)
863 __open_session(mdsc, session);
864
865 return session;
866}
867
868struct ceph_mds_session *
869ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
870{
871 struct ceph_mds_session *session;
872
873 dout("open_export_target_session to mds%d\n", target);
874
875 mutex_lock(&mdsc->mutex);
876 session = __open_export_target_session(mdsc, target);
877 mutex_unlock(&mdsc->mutex);
878
879 return session;
880}
881
ed0552a1
SW		 882static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
883 struct ceph_mds_session *session)
884{
885 struct ceph_mds_info *mi;
886 struct ceph_mds_session *ts;
887 int i, mds = session->s_mds;
ed0552a1
SW		 888
889 if (mds >= mdsc->mdsmap->m_max_mds)
890 return;
5d72d13c 891
ed0552a1
SW		 892 mi = &mdsc->mdsmap->m_info[mds];
893 dout("open_export_target_sessions for mds%d (%d targets)\n",
894 session->s_mds, mi->num_export_targets);
895
896 for (i = 0; i < mi->num_export_targets; i++) {
5d72d13c
YZ		 897 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
898 if (!IS_ERR(ts))
899 ceph_put_mds_session(ts);
ed0552a1
SW		 900 }
901}
902
154f42c2
SW		 903void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
904 struct ceph_mds_session *session)
905{
906 mutex_lock(&mdsc->mutex);
907 __open_export_target_sessions(mdsc, session);
908 mutex_unlock(&mdsc->mutex);
909}
910
2f2dc053
SW		 911/*
912 * session caps
913 */
914
915/*
916 * Free preallocated cap messages assigned to this session
917 */
918static void cleanup_cap_releases(struct ceph_mds_session *session)
919{
920 struct ceph_msg *msg;
921
922 spin_lock(&session->s_cap_lock);
923 while (!list_empty(&session->s_cap_releases)) {
924 msg = list_first_entry(&session->s_cap_releases,
925 struct ceph_msg, list_head);
926 list_del_init(&msg->list_head);
927 ceph_msg_put(msg);
928 }
929 while (!list_empty(&session->s_cap_releases_done)) {
930 msg = list_first_entry(&session->s_cap_releases_done,
931 struct ceph_msg, list_head);
932 list_del_init(&msg->list_head);
933 ceph_msg_put(msg);
934 }
935 spin_unlock(&session->s_cap_lock);
936}
937
938/*
f818a736
SW		 939 * Helper to safely iterate over all caps associated with a session, with
940 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 941 *
f818a736 942 * Caller must hold session s_mutex.
2f2dc053
SW		 943 */
944static int iterate_session_caps(struct ceph_mds_session *session,
945 int (*cb)(struct inode *, struct ceph_cap *,
946 void *), void *arg)
947{
7c1332b8
SW		 948 struct list_head *p;
949 struct ceph_cap *cap;
950 struct inode *inode, *last_inode = NULL;
951 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 952 int ret;
953
954 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
955 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 956 p = session->s_caps.next;
957 while (p != &session->s_caps) {
958 cap = list_entry(p, struct ceph_cap, session_caps);
2f2dc053 959 inode = igrab(&cap->ci->vfs_inode);
7c1332b8
SW		 960 if (!inode) {
961 p = p->next;
2f2dc053 962 continue;
7c1332b8
SW		 963 }
964 session->s_cap_iterator = cap;
2f2dc053 965 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 966
967 if (last_inode) {
968 iput(last_inode);
969 last_inode = NULL;
970 }
971 if (old_cap) {
37151668 972 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 973 old_cap = NULL;
974 }
975
2f2dc053 976 ret = cb(inode, cap, arg);
7c1332b8
SW		 977 last_inode = inode;
978
2f2dc053 979 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 980 p = p->next;
981 if (cap->ci == NULL) {
982 dout("iterate_session_caps finishing cap %p removal\n",
983 cap);
984 BUG_ON(cap->session != session);
985 list_del_init(&cap->session_caps);
986 session->s_nr_caps--;
987 cap->session = NULL;
988 old_cap = cap; /* put_cap it w/o locks held */
989 }
5dacf091
SW		 990 if (ret < 0)
991 goto out;
2f2dc053 992 }
5dacf091
SW		 993 ret = 0;
994out:
7c1332b8 995 session->s_cap_iterator = NULL;
2f2dc053 996 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 997
998 if (last_inode)
999 iput(last_inode);
1000 if (old_cap)
37151668 1001 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1002
5dacf091 1003 return ret;
2f2dc053
SW		 1004}
1005
1006static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
6c99f254 1007 void *arg)
2f2dc053
SW		 1008{
1009 struct ceph_inode_info *ci = ceph_inode(inode);
6c99f254
SW		 1010 int drop = 0;
1011
2f2dc053
SW		 1012 dout("removing cap %p, ci is %p, inode is %p\n",
1013 cap, ci, &ci->vfs_inode);
be655596 1014 spin_lock(&ci->i_ceph_lock);
a096b09a 1015 __ceph_remove_cap(cap, false);
6c99f254
SW		 1016 if (!__ceph_is_any_real_caps(ci)) {
1017 struct ceph_mds_client *mdsc =
3d14c5d2 1018 ceph_sb_to_client(inode->i_sb)->mdsc;
6c99f254
SW		 1019
1020 spin_lock(&mdsc->cap_dirty_lock);
1021 if (!list_empty(&ci->i_dirty_item)) {
1022 pr_info(" dropping dirty %s state for %p %lld\n",
1023 ceph_cap_string(ci->i_dirty_caps),
1024 inode, ceph_ino(inode));
1025 ci->i_dirty_caps = 0;
1026 list_del_init(&ci->i_dirty_item);
1027 drop = 1;
1028 }
1029 if (!list_empty(&ci->i_flushing_item)) {
1030 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
1031 ceph_cap_string(ci->i_flushing_caps),
1032 inode, ceph_ino(inode));
1033 ci->i_flushing_caps = 0;
1034 list_del_init(&ci->i_flushing_item);
1035 mdsc->num_cap_flushing--;
1036 drop = 1;
1037 }
1038 if (drop && ci->i_wrbuffer_ref) {
1039 pr_info(" dropping dirty data for %p %lld\n",
1040 inode, ceph_ino(inode));
1041 ci->i_wrbuffer_ref = 0;
1042 ci->i_wrbuffer_ref_head = 0;
1043 drop++;
1044 }
1045 spin_unlock(&mdsc->cap_dirty_lock);
1046 }
be655596 1047 spin_unlock(&ci->i_ceph_lock);
6c99f254
SW		 1048 while (drop--)
1049 iput(inode);
2f2dc053
SW		 1050 return 0;
1051}
1052
1053/*
1054 * caller must hold session s_mutex
1055 */
1056static void remove_session_caps(struct ceph_mds_session *session)
1057{
1058 dout("remove_session_caps on %p\n", session);
1059 iterate_session_caps(session, remove_session_caps_cb, NULL);
6f60f889
YZ		 1060
1061 spin_lock(&session->s_cap_lock);
1062 if (session->s_nr_caps > 0) {
1063 struct super_block *sb = session->s_mdsc->fsc->sb;
1064 struct inode *inode;
1065 struct ceph_cap *cap, *prev = NULL;
1066 struct ceph_vino vino;
1067 /*
1068 * iterate_session_caps() skips inodes that are being
1069 * deleted, we need to wait until deletions are complete.
1070 * __wait_on_freeing_inode() is designed for the job,
1071 * but it is not exported, so use lookup inode function
1072 * to access it.
1073 */
1074 while (!list_empty(&session->s_caps)) {
1075 cap = list_entry(session->s_caps.next,
1076 struct ceph_cap, session_caps);
1077 if (cap == prev)
1078 break;
1079 prev = cap;
1080 vino = cap->ci->i_vino;
1081 spin_unlock(&session->s_cap_lock);
1082
ed284c49 1083 inode = ceph_find_inode(sb, vino);
6f60f889
YZ		 1084 iput(inode);
1085
1086 spin_lock(&session->s_cap_lock);
1087 }
1088 }
1089 spin_unlock(&session->s_cap_lock);
1090
2f2dc053 1091 BUG_ON(session->s_nr_caps > 0);
6c99f254 1092 BUG_ON(!list_empty(&session->s_cap_flushing));
2f2dc053
SW		 1093 cleanup_cap_releases(session);
1094}
1095
1096/*
1097 * wake up any threads waiting on this session's caps. if the cap is
1098 * old (didn't get renewed on the client reconnect), remove it now.
1099 *
1100 * caller must hold s_mutex.
1101 */
1102static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1103 void *arg)
1104{
0dc2570f
SW		 1105 struct ceph_inode_info *ci = ceph_inode(inode);
1106
03066f23 1107 wake_up_all(&ci->i_cap_wq);
0dc2570f 1108 if (arg) {
be655596 1109 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1110 ci->i_wanted_max_size = 0;
1111 ci->i_requested_max_size = 0;
be655596 1112 spin_unlock(&ci->i_ceph_lock);
0dc2570f 1113 }
2f2dc053
SW		 1114 return 0;
1115}
1116
0dc2570f
SW		 1117static void wake_up_session_caps(struct ceph_mds_session *session,
1118 int reconnect)
2f2dc053
SW		 1119{
1120 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
0dc2570f
SW		 1121 iterate_session_caps(session, wake_up_session_cb,
1122 (void *)(unsigned long)reconnect);
2f2dc053
SW		 1123}
1124
1125/*
1126 * Send periodic message to MDS renewing all currently held caps. The
1127 * ack will reset the expiration for all caps from this session.
1128 *
1129 * caller holds s_mutex
1130 */
1131static int send_renew_caps(struct ceph_mds_client *mdsc,
1132 struct ceph_mds_session *session)
1133{
1134 struct ceph_msg *msg;
1135 int state;
1136
1137 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1138 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1139 pr_info("mds%d caps stale\n", session->s_mds);
e4cb4cb8 1140 session->s_renew_requested = jiffies;
2f2dc053
SW		 1141
1142 /* do not try to renew caps until a recovering mds has reconnected
1143 * with its clients. */
1144 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1145 if (state < CEPH_MDS_STATE_RECONNECT) {
1146 dout("send_renew_caps ignoring mds%d (%s)\n",
1147 session->s_mds, ceph_mds_state_name(state));
1148 return 0;
1149 }
1150
1151 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1152 ceph_mds_state_name(state));
2f2dc053
SW		 1153 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1154 ++session->s_renew_seq);
a79832f2
SW		 1155 if (!msg)
1156 return -ENOMEM;
2f2dc053
SW		 1157 ceph_con_send(&session->s_con, msg);
1158 return 0;
1159}
1160
186e4f7a
YZ		 1161static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1162 struct ceph_mds_session *session, u64 seq)
1163{
1164 struct ceph_msg *msg;
1165
1166 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1167 session->s_mds, session_state_name(session->s_state), seq);
1168 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1169 if (!msg)
1170 return -ENOMEM;
1171 ceph_con_send(&session->s_con, msg);
1172 return 0;
1173}
1174
1175
2f2dc053
SW		 1176/*
1177 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 1178 *
1179 * Called under session->s_mutex
2f2dc053
SW		 1180 */
1181static void renewed_caps(struct ceph_mds_client *mdsc,
1182 struct ceph_mds_session *session, int is_renew)
1183{
1184 int was_stale;
1185 int wake = 0;
1186
1187 spin_lock(&session->s_cap_lock);
1ce208a6 1188 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 1189
1190 session->s_cap_ttl = session->s_renew_requested +
1191 mdsc->mdsmap->m_session_timeout*HZ;
1192
1193 if (was_stale) {
1194 if (time_before(jiffies, session->s_cap_ttl)) {
1195 pr_info("mds%d caps renewed\n", session->s_mds);
1196 wake = 1;
1197 } else {
1198 pr_info("mds%d caps still stale\n", session->s_mds);
1199 }
1200 }
1201 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1202 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1203 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1204 spin_unlock(&session->s_cap_lock);
1205
1206 if (wake)
0dc2570f 1207 wake_up_session_caps(session, 0);
2f2dc053
SW		 1208}
1209
1210/*
1211 * send a session close request
1212 */
1213static int request_close_session(struct ceph_mds_client *mdsc,
1214 struct ceph_mds_session *session)
1215{
1216 struct ceph_msg *msg;
2f2dc053
SW		 1217
1218 dout("request_close_session mds%d state %s seq %lld\n",
1219 session->s_mds, session_state_name(session->s_state),
1220 session->s_seq);
1221 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
a79832f2
SW		 1222 if (!msg)
1223 return -ENOMEM;
1224 ceph_con_send(&session->s_con, msg);
1225 return 0;
2f2dc053
SW		 1226}
1227
1228/*
1229 * Called with s_mutex held.
1230 */
1231static int __close_session(struct ceph_mds_client *mdsc,
1232 struct ceph_mds_session *session)
1233{
1234 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1235 return 0;
1236 session->s_state = CEPH_MDS_SESSION_CLOSING;
1237 return request_close_session(mdsc, session);
1238}
1239
1240/*
1241 * Trim old(er) caps.
1242 *
1243 * Because we can't cache an inode without one or more caps, we do
1244 * this indirectly: if a cap is unused, we prune its aliases, at which
1245 * point the inode will hopefully get dropped to.
1246 *
1247 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1248 * memory pressure from the MDS, though, so it needn't be perfect.
1249 */
1250static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1251{
1252 struct ceph_mds_session *session = arg;
1253 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 1254 int used, wanted, oissued, mine;
2f2dc053
SW		 1255
1256 if (session->s_trim_caps <= 0)
1257 return -1;
1258
be655596 1259 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1260 mine = cap->issued | cap->implemented;
1261 used = __ceph_caps_used(ci);
979abfdd 1262 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 1263 oissued = __ceph_caps_issued_other(ci, cap);
1264
979abfdd 1265 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
2f2dc053 1266 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
979abfdd
YZ		 1267 ceph_cap_string(used), ceph_cap_string(wanted));
1268 if (cap == ci->i_auth_cap) {
1269 if (ci->i_dirty_caps | ci->i_flushing_caps)
1270 goto out;
1271 if ((used | wanted) & CEPH_CAP_ANY_WR)
1272 goto out;
1273 }
1274 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 1275 goto out; /* we need these caps */
1276
1277 session->s_trim_caps--;
1278 if (oissued) {
1279 /* we aren't the only cap.. just remove us */
a096b09a 1280 __ceph_remove_cap(cap, true);
2f2dc053
SW		 1281 } else {
1282 /* try to drop referring dentries */
be655596 1283 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1284 d_prune_aliases(inode);
1285 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1286 inode, cap, atomic_read(&inode->i_count));
1287 return 0;
1288 }
1289
1290out:
be655596 1291 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1292 return 0;
1293}
1294
1295/*
1296 * Trim session cap count down to some max number.
1297 */
1298static int trim_caps(struct ceph_mds_client *mdsc,
1299 struct ceph_mds_session *session,
1300 int max_caps)
1301{
1302 int trim_caps = session->s_nr_caps - max_caps;
1303
1304 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1305 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1306 if (trim_caps > 0) {
1307 session->s_trim_caps = trim_caps;
1308 iterate_session_caps(session, trim_caps_cb, session);
1309 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1310 session->s_mds, session->s_nr_caps, max_caps,
1311 trim_caps - session->s_trim_caps);
5dacf091 1312 session->s_trim_caps = 0;
2f2dc053 1313 }
a56371d9
YZ		 1314
1315 ceph_add_cap_releases(mdsc, session);
1316 ceph_send_cap_releases(mdsc, session);
2f2dc053
SW		 1317 return 0;
1318}
1319
1320/*
1321 * Allocate cap_release messages. If there is a partially full message
1322 * in the queue, try to allocate enough to cover it's remainder, so that
1323 * we can send it immediately.
1324 *
1325 * Called under s_mutex.
1326 */
2b2300d6 1327int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
ee6b272b 1328 struct ceph_mds_session *session)
2f2dc053 1329{
38e8883e 1330 struct ceph_msg *msg, *partial = NULL;
2f2dc053
SW		 1331 struct ceph_mds_cap_release *head;
1332 int err = -ENOMEM;
3d14c5d2 1333 int extra = mdsc->fsc->mount_options->cap_release_safety;
38e8883e 1334 int num;
2f2dc053 1335
38e8883e
SW		 1336 dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
1337 extra);
2f2dc053
SW		 1338
1339 spin_lock(&session->s_cap_lock);
1340
1341 if (!list_empty(&session->s_cap_releases)) {
1342 msg = list_first_entry(&session->s_cap_releases,
1343 struct ceph_msg,
1344 list_head);
1345 head = msg->front.iov_base;
38e8883e
SW		 1346 num = le32_to_cpu(head->num);
1347 if (num) {
1348 dout(" partial %p with (%d/%d)\n", msg, num,
1349 (int)CEPH_CAPS_PER_RELEASE);
1350 extra += CEPH_CAPS_PER_RELEASE - num;
1351 partial = msg;
1352 }
2f2dc053 1353 }
2f2dc053
SW		 1354 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1355 spin_unlock(&session->s_cap_lock);
34d23762 1356 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
b61c2763 1357 GFP_NOFS, false);
2f2dc053
SW		 1358 if (!msg)
1359 goto out_unlocked;
1360 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1361 (int)msg->front.iov_len);
1362 head = msg->front.iov_base;
1363 head->num = cpu_to_le32(0);
1364 msg->front.iov_len = sizeof(*head);
1365 spin_lock(&session->s_cap_lock);
1366 list_add(&msg->list_head, &session->s_cap_releases);
1367 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1368 }
1369
38e8883e
SW		 1370 if (partial) {
1371 head = partial->front.iov_base;
1372 num = le32_to_cpu(head->num);
1373 dout(" queueing partial %p with %d/%d\n", partial, num,
1374 (int)CEPH_CAPS_PER_RELEASE);
1375 list_move_tail(&partial->list_head,
1376 &session->s_cap_releases_done);
1377 session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
2f2dc053
SW		 1378 }
1379 err = 0;
1380 spin_unlock(&session->s_cap_lock);
1381out_unlocked:
1382 return err;
1383}
1384
1385/*
1386 * flush all dirty inode data to disk.
1387 *
1388 * returns true if we've flushed through want_flush_seq
1389 */
1390static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
1391{
1392 int mds, ret = 1;
1393
1394 dout("check_cap_flush want %lld\n", want_flush_seq);
1395 mutex_lock(&mdsc->mutex);
1396 for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
1397 struct ceph_mds_session *session = mdsc->sessions[mds];
1398
1399 if (!session)
1400 continue;
1401 get_session(session);
1402 mutex_unlock(&mdsc->mutex);
1403
1404 mutex_lock(&session->s_mutex);
1405 if (!list_empty(&session->s_cap_flushing)) {
1406 struct ceph_inode_info *ci =
1407 list_entry(session->s_cap_flushing.next,
1408 struct ceph_inode_info,
1409 i_flushing_item);
1410 struct inode *inode = &ci->vfs_inode;
1411
be655596 1412 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1413 if (ci->i_cap_flush_seq <= want_flush_seq) {
1414 dout("check_cap_flush still flushing %p "
1415 "seq %lld <= %lld to mds%d\n", inode,
1416 ci->i_cap_flush_seq, want_flush_seq,
1417 session->s_mds);
1418 ret = 0;
1419 }
be655596 1420 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1421 }
1422 mutex_unlock(&session->s_mutex);
1423 ceph_put_mds_session(session);
1424
1425 if (!ret)
1426 return ret;
1427 mutex_lock(&mdsc->mutex);
1428 }
1429
1430 mutex_unlock(&mdsc->mutex);
1431 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
1432 return ret;
1433}
1434
1435/*
1436 * called under s_mutex
1437 */
3d7ded4d
SW		 1438void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1439 struct ceph_mds_session *session)
2f2dc053
SW		 1440{
1441 struct ceph_msg *msg;
1442
1443 dout("send_cap_releases mds%d\n", session->s_mds);
0f8605f2
SW		 1444 spin_lock(&session->s_cap_lock);
1445 while (!list_empty(&session->s_cap_releases_done)) {
2f2dc053
SW		 1446 msg = list_first_entry(&session->s_cap_releases_done,
1447 struct ceph_msg, list_head);
1448 list_del_init(&msg->list_head);
1449 spin_unlock(&session->s_cap_lock);
1450 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1451 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1452 ceph_con_send(&session->s_con, msg);
0f8605f2 1453 spin_lock(&session->s_cap_lock);
2f2dc053
SW		 1454 }
1455 spin_unlock(&session->s_cap_lock);
1456}
1457
e01a5946
SW		 1458static void discard_cap_releases(struct ceph_mds_client *mdsc,
1459 struct ceph_mds_session *session)
1460{
1461 struct ceph_msg *msg;
1462 struct ceph_mds_cap_release *head;
1463 unsigned num;
1464
1465 dout("discard_cap_releases mds%d\n", session->s_mds);
e01a5946 1466
00bd8edb
YZ		 1467 if (!list_empty(&session->s_cap_releases)) {
1468 /* zero out the in-progress message */
1469 msg = list_first_entry(&session->s_cap_releases,
1470 struct ceph_msg, list_head);
1471 head = msg->front.iov_base;
1472 num = le32_to_cpu(head->num);
1473 dout("discard_cap_releases mds%d %p %u\n",
1474 session->s_mds, msg, num);
1475 head->num = cpu_to_le32(0);
1476 msg->front.iov_len = sizeof(*head);
1477 session->s_num_cap_releases += num;
1478 }
e01a5946
SW		 1479
1480 /* requeue completed messages */
1481 while (!list_empty(&session->s_cap_releases_done)) {
1482 msg = list_first_entry(&session->s_cap_releases_done,
1483 struct ceph_msg, list_head);
1484 list_del_init(&msg->list_head);
1485
1486 head = msg->front.iov_base;
1487 num = le32_to_cpu(head->num);
1488 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
1489 num);
1490 session->s_num_cap_releases += num;
1491 head->num = cpu_to_le32(0);
1492 msg->front.iov_len = sizeof(*head);
1493 list_add(&msg->list_head, &session->s_cap_releases);
1494 }
e01a5946
SW		 1495}
1496
2f2dc053
SW		 1497/*
1498 * requests
1499 */
1500
54008399
YZ		 1501int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1502 struct inode *dir)
1503{
1504 struct ceph_inode_info *ci = ceph_inode(dir);
1505 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1506 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1507 size_t size = sizeof(*rinfo->dir_in) + sizeof(*rinfo->dir_dname_len) +
1508 sizeof(*rinfo->dir_dname) + sizeof(*rinfo->dir_dlease);
1509 int order, num_entries;
1510
1511 spin_lock(&ci->i_ceph_lock);
1512 num_entries = ci->i_files + ci->i_subdirs;
1513 spin_unlock(&ci->i_ceph_lock);
1514 num_entries = max(num_entries, 1);
1515 num_entries = min(num_entries, opt->max_readdir);
1516
1517 order = get_order(size * num_entries);
1518 while (order >= 0) {
1519 rinfo->dir_in = (void*)__get_free_pages(GFP_NOFS | __GFP_NOWARN,
1520 order);
1521 if (rinfo->dir_in)
1522 break;
1523 order--;
1524 }
1525 if (!rinfo->dir_in)
1526 return -ENOMEM;
1527
1528 num_entries = (PAGE_SIZE << order) / size;
1529 num_entries = min(num_entries, opt->max_readdir);
1530
1531 rinfo->dir_buf_size = PAGE_SIZE << order;
1532 req->r_num_caps = num_entries + 1;
1533 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1534 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1535 return 0;
1536}
1537
2f2dc053
SW		 1538/*
1539 * Create an mds request.
1540 */
1541struct ceph_mds_request *
1542ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1543{
1544 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1545
1546 if (!req)
1547 return ERR_PTR(-ENOMEM);
1548
b4556396 1549 mutex_init(&req->r_fill_mutex);
37151668 1550 req->r_mdsc = mdsc;
2f2dc053
SW		 1551 req->r_started = jiffies;
1552 req->r_resend_mds = -1;
1553 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1554 req->r_fmode = -1;
153c8e6b 1555 kref_init(&req->r_kref);
2f2dc053
SW		 1556 INIT_LIST_HEAD(&req->r_wait);
1557 init_completion(&req->r_completion);
1558 init_completion(&req->r_safe_completion);
1559 INIT_LIST_HEAD(&req->r_unsafe_item);
1560
b8e69066
SW		 1561 req->r_stamp = CURRENT_TIME;
1562
2f2dc053
SW		 1563 req->r_op = op;
1564 req->r_direct_mode = mode;
1565 return req;
1566}
1567
1568/*
44ca18f2 1569 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 1570 *
1571 * called under mdsc->mutex.
1572 */
44ca18f2
SW		 1573static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1574{
1575 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1576 return NULL;
1577 return rb_entry(rb_first(&mdsc->request_tree),
1578 struct ceph_mds_request, r_node);
1579}
1580
2f2dc053
SW		 1581static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1582{
44ca18f2
SW		 1583 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1584
1585 if (req)
1586 return req->r_tid;
1587 return 0;
2f2dc053
SW		 1588}
1589
1590/*
1591 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1592 * on build_path_from_dentry in fs/cifs/dir.c.
1593 *
1594 * If @stop_on_nosnap, generate path relative to the first non-snapped
1595 * inode.
1596 *
1597 * Encode hidden .snap dirs as a double /, i.e.
1598 * foo/.snap/bar -> foo//bar
1599 */
1600char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1601 int stop_on_nosnap)
1602{
1603 struct dentry *temp;
1604 char *path;
1605 int len, pos;
1b71fe2e 1606 unsigned seq;
2f2dc053
SW		 1607
1608 if (dentry == NULL)
1609 return ERR_PTR(-EINVAL);
1610
1611retry:
1612 len = 0;
1b71fe2e
AV		 1613 seq = read_seqbegin(&rename_lock);
1614 rcu_read_lock();
2f2dc053
SW		 1615 for (temp = dentry; !IS_ROOT(temp);) {
1616 struct inode *inode = temp->d_inode;
1617 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1618 len++; /* slash only */
1619 else if (stop_on_nosnap && inode &&
1620 ceph_snap(inode) == CEPH_NOSNAP)
1621 break;
1622 else
1623 len += 1 + temp->d_name.len;
1624 temp = temp->d_parent;
2f2dc053 1625 }
1b71fe2e 1626 rcu_read_unlock();
2f2dc053
SW		 1627 if (len)
1628 len--; /* no leading '/' */
1629
1630 path = kmalloc(len+1, GFP_NOFS);
1631 if (path == NULL)
1632 return ERR_PTR(-ENOMEM);
1633 pos = len;
1634 path[pos] = 0; /* trailing null */
1b71fe2e 1635 rcu_read_lock();
2f2dc053 1636 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1b71fe2e 1637 struct inode *inode;
2f2dc053 1638
1b71fe2e
AV		 1639 spin_lock(&temp->d_lock);
1640 inode = temp->d_inode;
2f2dc053 1641 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
104648ad 1642 dout("build_path path+%d: %p SNAPDIR\n",
2f2dc053
SW		 1643 pos, temp);
1644 } else if (stop_on_nosnap && inode &&
1645 ceph_snap(inode) == CEPH_NOSNAP) {
9d5a09e6 1646 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1647 break;
1648 } else {
1649 pos -= temp->d_name.len;
1b71fe2e
AV		 1650 if (pos < 0) {
1651 spin_unlock(&temp->d_lock);
2f2dc053 1652 break;
1b71fe2e 1653 }
2f2dc053
SW		 1654 strncpy(path + pos, temp->d_name.name,
1655 temp->d_name.len);
2f2dc053 1656 }
1b71fe2e 1657 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1658 if (pos)
1659 path[--pos] = '/';
1660 temp = temp->d_parent;
2f2dc053 1661 }
1b71fe2e
AV		 1662 rcu_read_unlock();
1663 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
104648ad 1664 pr_err("build_path did not end path lookup where "
2f2dc053
SW		 1665 "expected, namelen is %d, pos is %d\n", len, pos);
1666 /* presumably this is only possible if racing with a
1667 rename of one of the parent directories (we can not
1668 lock the dentries above us to prevent this, but
1669 retrying should be harmless) */
1670 kfree(path);
1671 goto retry;
1672 }
1673
1674 *base = ceph_ino(temp->d_inode);
1675 *plen = len;
104648ad 1676 dout("build_path on %p %d built %llx '%.*s'\n",
84d08fa8 1677 dentry, d_count(dentry), *base, len, path);
2f2dc053
SW		 1678 return path;
1679}
1680
1681static int build_dentry_path(struct dentry *dentry,
1682 const char **ppath, int *ppathlen, u64 *pino,
1683 int *pfreepath)
1684{
1685 char *path;
1686
1687 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1688 *pino = ceph_ino(dentry->d_parent->d_inode);
1689 *ppath = dentry->d_name.name;
1690 *ppathlen = dentry->d_name.len;
1691 return 0;
1692 }
1693 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1694 if (IS_ERR(path))
1695 return PTR_ERR(path);
1696 *ppath = path;
1697 *pfreepath = 1;
1698 return 0;
1699}
1700
1701static int build_inode_path(struct inode *inode,
1702 const char **ppath, int *ppathlen, u64 *pino,
1703 int *pfreepath)
1704{
1705 struct dentry *dentry;
1706 char *path;
1707
1708 if (ceph_snap(inode) == CEPH_NOSNAP) {
1709 *pino = ceph_ino(inode);
1710 *ppathlen = 0;
1711 return 0;
1712 }
1713 dentry = d_find_alias(inode);
1714 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1715 dput(dentry);
1716 if (IS_ERR(path))
1717 return PTR_ERR(path);
1718 *ppath = path;
1719 *pfreepath = 1;
1720 return 0;
1721}
1722
1723/*
1724 * request arguments may be specified via an inode *, a dentry *, or
1725 * an explicit ino+path.
1726 */
1727static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1728 const char *rpath, u64 rino,
1729 const char **ppath, int *pathlen,
1730 u64 *ino, int *freepath)
1731{
1732 int r = 0;
1733
1734 if (rinode) {
1735 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1736 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1737 ceph_snap(rinode));
1738 } else if (rdentry) {
1739 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1740 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1741 *ppath);
795858db 1742 } else if (rpath || rino) {
2f2dc053
SW		 1743 *ino = rino;
1744 *ppath = rpath;
b000056a 1745 *pathlen = rpath ? strlen(rpath) : 0;
2f2dc053
SW		 1746 dout(" path %.*s\n", *pathlen, rpath);
1747 }
1748
1749 return r;
1750}
1751
1752/*
1753 * called under mdsc->mutex
1754 */
1755static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1756 struct ceph_mds_request *req,
1757 int mds)
1758{
1759 struct ceph_msg *msg;
1760 struct ceph_mds_request_head *head;
1761 const char *path1 = NULL;
1762 const char *path2 = NULL;
1763 u64 ino1 = 0, ino2 = 0;
1764 int pathlen1 = 0, pathlen2 = 0;
1765 int freepath1 = 0, freepath2 = 0;
1766 int len;
1767 u16 releases;
1768 void *p, *end;
1769 int ret;
1770
1771 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1772 req->r_path1, req->r_ino1.ino,
1773 &path1, &pathlen1, &ino1, &freepath1);
1774 if (ret < 0) {
1775 msg = ERR_PTR(ret);
1776 goto out;
1777 }
1778
1779 ret = set_request_path_attr(NULL, req->r_old_dentry,
1780 req->r_path2, req->r_ino2.ino,
1781 &path2, &pathlen2, &ino2, &freepath2);
1782 if (ret < 0) {
1783 msg = ERR_PTR(ret);
1784 goto out_free1;
1785 }
1786
1787 len = sizeof(*head) +
b8e69066
SW		 1788 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
1789 sizeof(struct timespec);
2f2dc053
SW		 1790
1791 /* calculate (max) length for cap releases */
1792 len += sizeof(struct ceph_mds_request_release) *
1793 (!!req->r_inode_drop + !!req->r_dentry_drop +
1794 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1795 if (req->r_dentry_drop)
1796 len += req->r_dentry->d_name.len;
1797 if (req->r_old_dentry_drop)
1798 len += req->r_old_dentry->d_name.len;
1799
b61c2763 1800 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
a79832f2
SW		 1801 if (!msg) {
1802 msg = ERR_PTR(-ENOMEM);
2f2dc053 1803 goto out_free2;
a79832f2 1804 }
2f2dc053 1805
b8e69066 1806 msg->hdr.version = 2;
6df058c0
SW		 1807 msg->hdr.tid = cpu_to_le64(req->r_tid);
1808
2f2dc053
SW		 1809 head = msg->front.iov_base;
1810 p = msg->front.iov_base + sizeof(*head);
1811 end = msg->front.iov_base + msg->front.iov_len;
1812
1813 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1814 head->op = cpu_to_le32(req->r_op);
ff3d0046
EB		 1815 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1816 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2f2dc053
SW		 1817 head->args = req->r_args;
1818
1819 ceph_encode_filepath(&p, end, ino1, path1);
1820 ceph_encode_filepath(&p, end, ino2, path2);
1821
e979cf50
SW		 1822 /* make note of release offset, in case we need to replay */
1823 req->r_request_release_offset = p - msg->front.iov_base;
1824
2f2dc053
SW		 1825 /* cap releases */
1826 releases = 0;
1827 if (req->r_inode_drop)
1828 releases += ceph_encode_inode_release(&p,
1829 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1830 mds, req->r_inode_drop, req->r_inode_unless, 0);
1831 if (req->r_dentry_drop)
1832 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1833 mds, req->r_dentry_drop, req->r_dentry_unless);
1834 if (req->r_old_dentry_drop)
1835 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1836 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1837 if (req->r_old_inode_drop)
1838 releases += ceph_encode_inode_release(&p,
1839 req->r_old_dentry->d_inode,
1840 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1841 head->num_releases = cpu_to_le16(releases);
1842
b8e69066
SW		 1843 /* time stamp */
1844 ceph_encode_copy(&p, &req->r_stamp, sizeof(req->r_stamp));
1845
2f2dc053
SW		 1846 BUG_ON(p > end);
1847 msg->front.iov_len = p - msg->front.iov_base;
1848 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1849
ebf18f47
AE		 1850 if (req->r_data_len) {
1851 /* outbound data set only by ceph_sync_setxattr() */
1852 BUG_ON(!req->r_pages);
90af3602 1853 ceph_msg_data_add_pages(msg, req->r_pages, req->r_data_len, 0);
ebf18f47 1854 }
02afca6c 1855
2f2dc053
SW		 1856 msg->hdr.data_len = cpu_to_le32(req->r_data_len);
1857 msg->hdr.data_off = cpu_to_le16(0);
1858
1859out_free2:
1860 if (freepath2)
1861 kfree((char *)path2);
1862out_free1:
1863 if (freepath1)
1864 kfree((char *)path1);
1865out:
1866 return msg;
1867}
1868
1869/*
1870 * called under mdsc->mutex if error, under no mutex if
1871 * success.
1872 */
1873static void complete_request(struct ceph_mds_client *mdsc,
1874 struct ceph_mds_request *req)
1875{
1876 if (req->r_callback)
1877 req->r_callback(mdsc, req);
1878 else
03066f23 1879 complete_all(&req->r_completion);
2f2dc053
SW		 1880}
1881
1882/*
1883 * called under mdsc->mutex
1884 */
1885static int __prepare_send_request(struct ceph_mds_client *mdsc,
1886 struct ceph_mds_request *req,
1887 int mds)
1888{
1889 struct ceph_mds_request_head *rhead;
1890 struct ceph_msg *msg;
1891 int flags = 0;
1892
2f2dc053 1893 req->r_attempts++;
e55b71f8
GF		 1894 if (req->r_inode) {
1895 struct ceph_cap *cap =
1896 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
1897
1898 if (cap)
1899 req->r_sent_on_mseq = cap->mseq;
1900 else
1901 req->r_sent_on_mseq = -1;
1902 }
2f2dc053
SW		 1903 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
1904 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
1905
01a92f17 1906 if (req->r_got_unsafe) {
c5c9a0bf 1907 void *p;
01a92f17
SW		 1908 /*
1909 * Replay. Do not regenerate message (and rebuild
1910 * paths, etc.); just use the original message.
1911 * Rebuilding paths will break for renames because
1912 * d_move mangles the src name.
1913 */
1914 msg = req->r_request;
1915 rhead = msg->front.iov_base;
1916
1917 flags = le32_to_cpu(rhead->flags);
1918 flags |= CEPH_MDS_FLAG_REPLAY;
1919 rhead->flags = cpu_to_le32(flags);
1920
1921 if (req->r_target_inode)
1922 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
1923
1924 rhead->num_retry = req->r_attempts - 1;
e979cf50
SW		 1925
1926 /* remove cap/dentry releases from message */
1927 rhead->num_releases = 0;
c5c9a0bf
YZ		 1928
1929 /* time stamp */
1930 p = msg->front.iov_base + req->r_request_release_offset;
1931 ceph_encode_copy(&p, &req->r_stamp, sizeof(req->r_stamp));
1932
1933 msg->front.iov_len = p - msg->front.iov_base;
1934 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 1935 return 0;
1936 }
1937
2f2dc053
SW		 1938 if (req->r_request) {
1939 ceph_msg_put(req->r_request);
1940 req->r_request = NULL;
1941 }
1942 msg = create_request_message(mdsc, req, mds);
1943 if (IS_ERR(msg)) {
e1518c7c 1944 req->r_err = PTR_ERR(msg);
2f2dc053 1945 complete_request(mdsc, req);
a79832f2 1946 return PTR_ERR(msg);
2f2dc053
SW		 1947 }
1948 req->r_request = msg;
1949
1950 rhead = msg->front.iov_base;
2f2dc053
SW		 1951 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
1952 if (req->r_got_unsafe)
1953 flags |= CEPH_MDS_FLAG_REPLAY;
1954 if (req->r_locked_dir)
1955 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
1956 rhead->flags = cpu_to_le32(flags);
1957 rhead->num_fwd = req->r_num_fwd;
1958 rhead->num_retry = req->r_attempts - 1;
01a92f17 1959 rhead->ino = 0;
2f2dc053
SW		 1960
1961 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2f2dc053
SW		 1962 return 0;
1963}
1964
1965/*
1966 * send request, or put it on the appropriate wait list.
1967 */
1968static int __do_request(struct ceph_mds_client *mdsc,
1969 struct ceph_mds_request *req)
1970{
1971 struct ceph_mds_session *session = NULL;
1972 int mds = -1;
1973 int err = -EAGAIN;
1974
eb1b8af3
YZ		 1975 if (req->r_err || req->r_got_result) {
1976 if (req->r_aborted)
1977 __unregister_request(mdsc, req);
2f2dc053 1978 goto out;
eb1b8af3 1979 }
2f2dc053
SW		 1980
1981 if (req->r_timeout &&
1982 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
1983 dout("do_request timed out\n");
1984 err = -EIO;
1985 goto finish;
1986 }
1987
dc69e2e9
SW		 1988 put_request_session(req);
1989
2f2dc053
SW		 1990 mds = __choose_mds(mdsc, req);
1991 if (mds < 0 ||
1992 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
1993 dout("do_request no mds or not active, waiting for map\n");
1994 list_add(&req->r_wait, &mdsc->waiting_for_map);
1995 goto out;
1996 }
1997
1998 /* get, open session */
1999 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 2000 if (!session) {
2f2dc053 2001 session = register_session(mdsc, mds);
9c423956
SW		 2002 if (IS_ERR(session)) {
2003 err = PTR_ERR(session);
2004 goto finish;
2005 }
2006 }
dc69e2e9
SW		 2007 req->r_session = get_session(session);
2008
2f2dc053
SW		 2009 dout("do_request mds%d session %p state %s\n", mds, session,
2010 session_state_name(session->s_state));
2011 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2012 session->s_state != CEPH_MDS_SESSION_HUNG) {
2013 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2014 session->s_state == CEPH_MDS_SESSION_CLOSING)
2015 __open_session(mdsc, session);
2016 list_add(&req->r_wait, &session->s_waiting);
2017 goto out_session;
2018 }
2019
2020 /* send request */
2f2dc053
SW		 2021 req->r_resend_mds = -1; /* forget any previous mds hint */
2022
2023 if (req->r_request_started == 0) /* note request start time */
2024 req->r_request_started = jiffies;
2025
2026 err = __prepare_send_request(mdsc, req, mds);
2027 if (!err) {
2028 ceph_msg_get(req->r_request);
2029 ceph_con_send(&session->s_con, req->r_request);
2030 }
2031
2032out_session:
2033 ceph_put_mds_session(session);
2034out:
2035 return err;
2036
2037finish:
e1518c7c 2038 req->r_err = err;
2f2dc053
SW		 2039 complete_request(mdsc, req);
2040 goto out;
2041}
2042
2043/*
2044 * called under mdsc->mutex
2045 */
2046static void __wake_requests(struct ceph_mds_client *mdsc,
2047 struct list_head *head)
2048{
ed75ec2c
YZ		 2049 struct ceph_mds_request *req;
2050 LIST_HEAD(tmp_list);
2051
2052 list_splice_init(head, &tmp_list);
2f2dc053 2053
ed75ec2c
YZ		 2054 while (!list_empty(&tmp_list)) {
2055 req = list_entry(tmp_list.next,
2056 struct ceph_mds_request, r_wait);
2f2dc053 2057 list_del_init(&req->r_wait);
7971bd92 2058 dout(" wake request %p tid %llu\n", req, req->r_tid);
2f2dc053
SW		 2059 __do_request(mdsc, req);
2060 }
2061}
2062
2063/*
2064 * Wake up threads with requests pending for @mds, so that they can
29790f26 2065 * resubmit their requests to a possibly different mds.
2f2dc053 2066 */
29790f26 2067static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 2068{
44ca18f2 2069 struct ceph_mds_request *req;
282c1052 2070 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053
SW		 2071
2072 dout("kick_requests mds%d\n", mds);
282c1052 2073 while (p) {
44ca18f2 2074 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 2075 p = rb_next(p);
44ca18f2
SW		 2076 if (req->r_got_unsafe)
2077 continue;
2078 if (req->r_session &&
2079 req->r_session->s_mds == mds) {
2080 dout(" kicking tid %llu\n", req->r_tid);
44ca18f2 2081 __do_request(mdsc, req);
2f2dc053
SW		 2082 }
2083 }
2084}
2085
2086void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2087 struct ceph_mds_request *req)
2088{
2089 dout("submit_request on %p\n", req);
2090 mutex_lock(&mdsc->mutex);
2091 __register_request(mdsc, req, NULL);
2092 __do_request(mdsc, req);
2093 mutex_unlock(&mdsc->mutex);
2094}
2095
2096/*
2097 * Synchrously perform an mds request. Take care of all of the
2098 * session setup, forwarding, retry details.
2099 */
2100int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2101 struct inode *dir,
2102 struct ceph_mds_request *req)
2103{
2104 int err;
2105
2106 dout("do_request on %p\n", req);
2107
2108 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2109 if (req->r_inode)
2110 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2111 if (req->r_locked_dir)
2112 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
844d87c3 2113 if (req->r_old_dentry_dir)
41b02e1f
SW		 2114 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2115 CEPH_CAP_PIN);
2f2dc053
SW		 2116
2117 /* issue */
2118 mutex_lock(&mdsc->mutex);
2119 __register_request(mdsc, req, dir);
2120 __do_request(mdsc, req);
2121
e1518c7c
SW		 2122 if (req->r_err) {
2123 err = req->r_err;
2124 __unregister_request(mdsc, req);
2125 dout("do_request early error %d\n", err);
2126 goto out;
2f2dc053
SW		 2127 }
2128
e1518c7c
SW		 2129 /* wait */
2130 mutex_unlock(&mdsc->mutex);
2131 dout("do_request waiting\n");
2132 if (req->r_timeout) {
aa91647c 2133 err = (long)wait_for_completion_killable_timeout(
e1518c7c
SW		 2134 &req->r_completion, req->r_timeout);
2135 if (err == 0)
2136 err = -EIO;
2137 } else {
aa91647c 2138 err = wait_for_completion_killable(&req->r_completion);
e1518c7c
SW		 2139 }
2140 dout("do_request waited, got %d\n", err);
2141 mutex_lock(&mdsc->mutex);
5b1daecd 2142
e1518c7c
SW		 2143 /* only abort if we didn't race with a real reply */
2144 if (req->r_got_result) {
2145 err = le32_to_cpu(req->r_reply_info.head->result);
2146 } else if (err < 0) {
2147 dout("aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 2148
2149 /*
2150 * ensure we aren't running concurrently with
2151 * ceph_fill_trace or ceph_readdir_prepopulate, which
2152 * rely on locks (dir mutex) held by our caller.
2153 */
2154 mutex_lock(&req->r_fill_mutex);
e1518c7c
SW		 2155 req->r_err = err;
2156 req->r_aborted = true;
b4556396 2157 mutex_unlock(&req->r_fill_mutex);
5b1daecd 2158
e1518c7c 2159 if (req->r_locked_dir &&
167c9e35
SW		 2160 (req->r_op & CEPH_MDS_OP_WRITE))
2161 ceph_invalidate_dir_request(req);
2f2dc053 2162 } else {
e1518c7c 2163 err = req->r_err;
2f2dc053 2164 }
2f2dc053 2165
e1518c7c
SW		 2166out:
2167 mutex_unlock(&mdsc->mutex);
2f2dc053
SW		 2168 dout("do_request %p done, result %d\n", req, err);
2169 return err;
2170}
2171
167c9e35 2172/*
2f276c51 2173 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 2174 * namespace request.
2175 */
2176void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2177{
2178 struct inode *inode = req->r_locked_dir;
167c9e35 2179
2f276c51 2180 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
167c9e35 2181
2f276c51 2182 ceph_dir_clear_complete(inode);
167c9e35
SW		 2183 if (req->r_dentry)
2184 ceph_invalidate_dentry_lease(req->r_dentry);
2185 if (req->r_old_dentry)
2186 ceph_invalidate_dentry_lease(req->r_old_dentry);
2187}
2188
2f2dc053
SW		 2189/*
2190 * Handle mds reply.
2191 *
2192 * We take the session mutex and parse and process the reply immediately.
2193 * This preserves the logical ordering of replies, capabilities, etc., sent
2194 * by the MDS as they are applied to our local cache.
2195 */
2196static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2197{
2198 struct ceph_mds_client *mdsc = session->s_mdsc;
2199 struct ceph_mds_request *req;
2200 struct ceph_mds_reply_head *head = msg->front.iov_base;
2201 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2202 u64 tid;
2203 int err, result;
2600d2dd 2204 int mds = session->s_mds;
2f2dc053 2205
2f2dc053
SW		 2206 if (msg->front.iov_len < sizeof(*head)) {
2207 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
9ec7cab1 2208 ceph_msg_dump(msg);
2f2dc053
SW		 2209 return;
2210 }
2211
2212 /* get request, session */
6df058c0 2213 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2214 mutex_lock(&mdsc->mutex);
2215 req = __lookup_request(mdsc, tid);
2216 if (!req) {
2217 dout("handle_reply on unknown tid %llu\n", tid);
2218 mutex_unlock(&mdsc->mutex);
2219 return;
2220 }
2221 dout("handle_reply %p\n", req);
2f2dc053
SW		 2222
2223 /* correct session? */
d96d6049 2224 if (req->r_session != session) {
2f2dc053
SW		 2225 pr_err("mdsc_handle_reply got %llu on session mds%d"
2226 " not mds%d\n", tid, session->s_mds,
2227 req->r_session ? req->r_session->s_mds : -1);
2228 mutex_unlock(&mdsc->mutex);
2229 goto out;
2230 }
2231
2232 /* dup? */
2233 if ((req->r_got_unsafe && !head->safe) ||
2234 (req->r_got_safe && head->safe)) {
f3ae1b97 2235 pr_warn("got a dup %s reply on %llu from mds%d\n",
2f2dc053
SW		 2236 head->safe ? "safe" : "unsafe", tid, mds);
2237 mutex_unlock(&mdsc->mutex);
2238 goto out;
2239 }
85792d0d 2240 if (req->r_got_safe && !head->safe) {
f3ae1b97 2241 pr_warn("got unsafe after safe on %llu from mds%d\n",
85792d0d
SW		 2242 tid, mds);
2243 mutex_unlock(&mdsc->mutex);
2244 goto out;
2245 }
2f2dc053
SW		 2246
2247 result = le32_to_cpu(head->result);
2248
2249 /*
e55b71f8
GF		 2250 * Handle an ESTALE
2251 * if we're not talking to the authority, send to them
2252 * if the authority has changed while we weren't looking,
2253 * send to new authority
2254 * Otherwise we just have to return an ESTALE
2f2dc053
SW		 2255 */
2256 if (result == -ESTALE) {
e55b71f8 2257 dout("got ESTALE on request %llu", req->r_tid);
51da8e8c 2258 req->r_resend_mds = -1;
ca18bede 2259 if (req->r_direct_mode != USE_AUTH_MDS) {
e55b71f8
GF		 2260 dout("not using auth, setting for that now");
2261 req->r_direct_mode = USE_AUTH_MDS;
2f2dc053
SW		 2262 __do_request(mdsc, req);
2263 mutex_unlock(&mdsc->mutex);
2264 goto out;
e55b71f8 2265 } else {
ca18bede
YZ		 2266 int mds = __choose_mds(mdsc, req);
2267 if (mds >= 0 && mds != req->r_session->s_mds) {
2268 dout("but auth changed, so resending");
e55b71f8
GF		 2269 __do_request(mdsc, req);
2270 mutex_unlock(&mdsc->mutex);
2271 goto out;
2272 }
2f2dc053 2273 }
e55b71f8 2274 dout("have to return ESTALE on request %llu", req->r_tid);
2f2dc053
SW		 2275 }
2276
e55b71f8 2277
2f2dc053
SW		 2278 if (head->safe) {
2279 req->r_got_safe = true;
2280 __unregister_request(mdsc, req);
2f2dc053
SW		 2281
2282 if (req->r_got_unsafe) {
2283 /*
2284 * We already handled the unsafe response, now do the
2285 * cleanup. No need to examine the response; the MDS
2286 * doesn't include any result info in the safe
2287 * response. And even if it did, there is nothing
2288 * useful we could do with a revised return value.
2289 */
2290 dout("got safe reply %llu, mds%d\n", tid, mds);
2291 list_del_init(&req->r_unsafe_item);
2292
2293 /* last unsafe request during umount? */
44ca18f2 2294 if (mdsc->stopping && !__get_oldest_req(mdsc))
03066f23 2295 complete_all(&mdsc->safe_umount_waiters);
2f2dc053
SW		 2296 mutex_unlock(&mdsc->mutex);
2297 goto out;
2298 }
e1518c7c 2299 } else {
2f2dc053
SW		 2300 req->r_got_unsafe = true;
2301 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2302 }
2303
2304 dout("handle_reply tid %lld result %d\n", tid, result);
2305 rinfo = &req->r_reply_info;
14303d20 2306 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2f2dc053
SW		 2307 mutex_unlock(&mdsc->mutex);
2308
2309 mutex_lock(&session->s_mutex);
2310 if (err < 0) {
25933abd 2311 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
9ec7cab1 2312 ceph_msg_dump(msg);
2f2dc053
SW		 2313 goto out_err;
2314 }
2315
2316 /* snap trace */
2317 if (rinfo->snapblob_len) {
2318 down_write(&mdsc->snap_rwsem);
2319 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2320 rinfo->snapblob + rinfo->snapblob_len,
2321 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
2322 downgrade_write(&mdsc->snap_rwsem);
2323 } else {
2324 down_read(&mdsc->snap_rwsem);
2325 }
2326
2327 /* insert trace into our cache */
b4556396 2328 mutex_lock(&req->r_fill_mutex);
3d14c5d2 2329 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2f2dc053 2330 if (err == 0) {
6e8575fa 2331 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 2332 req->r_op == CEPH_MDS_OP_LSSNAP))
2f2dc053 2333 ceph_readdir_prepopulate(req, req->r_session);
37151668 2334 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2f2dc053 2335 }
b4556396 2336 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 2337
2338 up_read(&mdsc->snap_rwsem);
2339out_err:
e1518c7c
SW		 2340 mutex_lock(&mdsc->mutex);
2341 if (!req->r_aborted) {
2342 if (err) {
2343 req->r_err = err;
2344 } else {
2345 req->r_reply = msg;
2346 ceph_msg_get(msg);
2347 req->r_got_result = true;
2348 }
2f2dc053 2349 } else {
e1518c7c 2350 dout("reply arrived after request %lld was aborted\n", tid);
2f2dc053 2351 }
e1518c7c 2352 mutex_unlock(&mdsc->mutex);
2f2dc053 2353
ee6b272b 2354 ceph_add_cap_releases(mdsc, req->r_session);
2f2dc053
SW		 2355 mutex_unlock(&session->s_mutex);
2356
2357 /* kick calling process */
2358 complete_request(mdsc, req);
2359out:
2360 ceph_mdsc_put_request(req);
2361 return;
2362}
2363
2364
2365
2366/*
2367 * handle mds notification that our request has been forwarded.
2368 */
2600d2dd
SW		 2369static void handle_forward(struct ceph_mds_client *mdsc,
2370 struct ceph_mds_session *session,
2371 struct ceph_msg *msg)
2f2dc053
SW		 2372{
2373 struct ceph_mds_request *req;
a1ea787c 2374 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2375 u32 next_mds;
2376 u32 fwd_seq;
2f2dc053
SW		 2377 int err = -EINVAL;
2378 void *p = msg->front.iov_base;
2379 void *end = p + msg->front.iov_len;
2f2dc053 2380
a1ea787c 2381 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 2382 next_mds = ceph_decode_32(&p);
2383 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 2384
2385 mutex_lock(&mdsc->mutex);
2386 req = __lookup_request(mdsc, tid);
2387 if (!req) {
2a8e5e36 2388 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2f2dc053
SW		 2389 goto out; /* dup reply? */
2390 }
2391
2a8e5e36
SW		 2392 if (req->r_aborted) {
2393 dout("forward tid %llu aborted, unregistering\n", tid);
2394 __unregister_request(mdsc, req);
2395 } else if (fwd_seq <= req->r_num_fwd) {
2396 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2f2dc053
SW		 2397 tid, next_mds, req->r_num_fwd, fwd_seq);
2398 } else {
2399 /* resend. forward race not possible; mds would drop */
2a8e5e36
SW		 2400 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2401 BUG_ON(req->r_err);
2402 BUG_ON(req->r_got_result);
2f2dc053
SW		 2403 req->r_num_fwd = fwd_seq;
2404 req->r_resend_mds = next_mds;
2405 put_request_session(req);
2406 __do_request(mdsc, req);
2407 }
2408 ceph_mdsc_put_request(req);
2409out:
2410 mutex_unlock(&mdsc->mutex);
2411 return;
2412
2413bad:
2414 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2415}
2416
2417/*
2418 * handle a mds session control message
2419 */
2420static void handle_session(struct ceph_mds_session *session,
2421 struct ceph_msg *msg)
2422{
2423 struct ceph_mds_client *mdsc = session->s_mdsc;
2424 u32 op;
2425 u64 seq;
2600d2dd 2426 int mds = session->s_mds;
2f2dc053
SW		 2427 struct ceph_mds_session_head *h = msg->front.iov_base;
2428 int wake = 0;
2429
2f2dc053
SW		 2430 /* decode */
2431 if (msg->front.iov_len != sizeof(*h))
2432 goto bad;
2433 op = le32_to_cpu(h->op);
2434 seq = le64_to_cpu(h->seq);
2435
2436 mutex_lock(&mdsc->mutex);
2600d2dd
SW		 2437 if (op == CEPH_SESSION_CLOSE)
2438 __unregister_session(mdsc, session);
2f2dc053
SW		 2439 /* FIXME: this ttl calculation is generous */
2440 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2441 mutex_unlock(&mdsc->mutex);
2442
2443 mutex_lock(&session->s_mutex);
2444
2445 dout("handle_session mds%d %s %p state %s seq %llu\n",
2446 mds, ceph_session_op_name(op), session,
2447 session_state_name(session->s_state), seq);
2448
2449 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2450 session->s_state = CEPH_MDS_SESSION_OPEN;
2451 pr_info("mds%d came back\n", session->s_mds);
2452 }
2453
2454 switch (op) {
2455 case CEPH_SESSION_OPEN:
29790f26
SW		 2456 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2457 pr_info("mds%d reconnect success\n", session->s_mds);
2f2dc053
SW		 2458 session->s_state = CEPH_MDS_SESSION_OPEN;
2459 renewed_caps(mdsc, session, 0);
2460 wake = 1;
2461 if (mdsc->stopping)
2462 __close_session(mdsc, session);
2463 break;
2464
2465 case CEPH_SESSION_RENEWCAPS:
2466 if (session->s_renew_seq == seq)
2467 renewed_caps(mdsc, session, 1);
2468 break;
2469
2470 case CEPH_SESSION_CLOSE:
29790f26
SW		 2471 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2472 pr_info("mds%d reconnect denied\n", session->s_mds);
2f2dc053
SW		 2473 remove_session_caps(session);
2474 wake = 1; /* for good measure */
f3c60c59 2475 wake_up_all(&mdsc->session_close_wq);
29790f26 2476 kick_requests(mdsc, mds);
2f2dc053
SW		 2477 break;
2478
2479 case CEPH_SESSION_STALE:
2480 pr_info("mds%d caps went stale, renewing\n",
2481 session->s_mds);
d8fb02ab 2482 spin_lock(&session->s_gen_ttl_lock);
2f2dc053 2483 session->s_cap_gen++;
1ce208a6 2484 session->s_cap_ttl = jiffies - 1;
d8fb02ab 2485 spin_unlock(&session->s_gen_ttl_lock);
2f2dc053
SW		 2486 send_renew_caps(mdsc, session);
2487 break;
2488
2489 case CEPH_SESSION_RECALL_STATE:
2490 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2491 break;
2492
186e4f7a
YZ		 2493 case CEPH_SESSION_FLUSHMSG:
2494 send_flushmsg_ack(mdsc, session, seq);
2495 break;
2496
2f2dc053
SW		 2497 default:
2498 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2499 WARN_ON(1);
2500 }
2501
2502 mutex_unlock(&session->s_mutex);
2503 if (wake) {
2504 mutex_lock(&mdsc->mutex);
2505 __wake_requests(mdsc, &session->s_waiting);
2506 mutex_unlock(&mdsc->mutex);
2507 }
2508 return;
2509
2510bad:
2511 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2512 (int)msg->front.iov_len);
9ec7cab1 2513 ceph_msg_dump(msg);
2f2dc053
SW		 2514 return;
2515}
2516
2517
2518/*
2519 * called under session->mutex.
2520 */
2521static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2522 struct ceph_mds_session *session)
2523{
2524 struct ceph_mds_request *req, *nreq;
2525 int err;
2526
2527 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2528
2529 mutex_lock(&mdsc->mutex);
2530 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2531 err = __prepare_send_request(mdsc, req, session->s_mds);
2532 if (!err) {
2533 ceph_msg_get(req->r_request);
2534 ceph_con_send(&session->s_con, req->r_request);
2535 }
2536 }
2537 mutex_unlock(&mdsc->mutex);
2538}
2539
2540/*
2541 * Encode information about a cap for a reconnect with the MDS.
2542 */
2f2dc053
SW		 2543static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2544 void *arg)
2545{
20cb34ae
SW		 2546 union {
2547 struct ceph_mds_cap_reconnect v2;
2548 struct ceph_mds_cap_reconnect_v1 v1;
2549 } rec;
2550 size_t reclen;
2f2dc053 2551 struct ceph_inode_info *ci;
20cb34ae
SW		 2552 struct ceph_reconnect_state *recon_state = arg;
2553 struct ceph_pagelist *pagelist = recon_state->pagelist;
2f2dc053
SW		 2554 char *path;
2555 int pathlen, err;
2556 u64 pathbase;
2557 struct dentry *dentry;
2558
2559 ci = cap->ci;
2560
2561 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2562 inode, ceph_vinop(inode), cap, cap->cap_id,
2563 ceph_cap_string(cap->issued));
93cea5be
SW		 2564 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2565 if (err)
2566 return err;
2f2dc053
SW		 2567
2568 dentry = d_find_alias(inode);
2569 if (dentry) {
2570 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2571 if (IS_ERR(path)) {
2572 err = PTR_ERR(path);
e072f8aa 2573 goto out_dput;
2f2dc053
SW		 2574 }
2575 } else {
2576 path = NULL;
2577 pathlen = 0;
2578 }
93cea5be
SW		 2579 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2580 if (err)
e072f8aa 2581 goto out_free;
2f2dc053 2582
be655596 2583 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 2584 cap->seq = 0; /* reset cap seq */
2585 cap->issue_seq = 0; /* and issue_seq */
667ca05c 2586 cap->mseq = 0; /* and migrate_seq */
99a9c273 2587 cap->cap_gen = cap->session->s_cap_gen;
20cb34ae
SW		 2588
2589 if (recon_state->flock) {
2590 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2591 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2592 rec.v2.issued = cpu_to_le32(cap->issued);
2593 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2594 rec.v2.pathbase = cpu_to_le64(pathbase);
2595 rec.v2.flock_len = 0;
2596 reclen = sizeof(rec.v2);
2597 } else {
2598 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2599 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2600 rec.v1.issued = cpu_to_le32(cap->issued);
2601 rec.v1.size = cpu_to_le64(inode->i_size);
2602 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2603 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2604 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2605 rec.v1.pathbase = cpu_to_le64(pathbase);
2606 reclen = sizeof(rec.v1);
2607 }
be655596 2608 spin_unlock(&ci->i_ceph_lock);
2f2dc053 2609
40819f6f
GF		 2610 if (recon_state->flock) {
2611 int num_fcntl_locks, num_flock_locks;
39be95e9
JS		 2612 struct ceph_filelock *flocks;
2613
2614encode_again:
1c8c601a 2615 spin_lock(&inode->i_lock);
39be95e9 2616 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
1c8c601a 2617 spin_unlock(&inode->i_lock);
39be95e9
JS		 2618 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2619 sizeof(struct ceph_filelock), GFP_NOFS);
2620 if (!flocks) {
2621 err = -ENOMEM;
2622 goto out_free;
2623 }
1c8c601a 2624 spin_lock(&inode->i_lock);
39be95e9
JS		 2625 err = ceph_encode_locks_to_buffer(inode, flocks,
2626 num_fcntl_locks,
2627 num_flock_locks);
1c8c601a 2628 spin_unlock(&inode->i_lock);
39be95e9
JS		 2629 if (err) {
2630 kfree(flocks);
2631 if (err == -ENOSPC)
2632 goto encode_again;
2633 goto out_free;
2634 }
2635 /*
2636 * number of encoded locks is stable, so copy to pagelist
2637 */
2638 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
2639 (num_fcntl_locks+num_flock_locks) *
2640 sizeof(struct ceph_filelock));
2641 err = ceph_pagelist_append(pagelist, &rec, reclen);
2642 if (!err)
2643 err = ceph_locks_to_pagelist(flocks, pagelist,
2644 num_fcntl_locks,
2645 num_flock_locks);
2646 kfree(flocks);
3612abbd
SW		 2647 } else {
2648 err = ceph_pagelist_append(pagelist, &rec, reclen);
40819f6f 2649 }
44c99757
YZ		 2650
2651 recon_state->nr_caps++;
e072f8aa 2652out_free:
2f2dc053 2653 kfree(path);
e072f8aa 2654out_dput:
2f2dc053 2655 dput(dentry);
93cea5be 2656 return err;
2f2dc053
SW		 2657}
2658
2659
2660/*
2661 * If an MDS fails and recovers, clients need to reconnect in order to
2662 * reestablish shared state. This includes all caps issued through
2663 * this session _and_ the snap_realm hierarchy. Because it's not
2664 * clear which snap realms the mds cares about, we send everything we
2665 * know about.. that ensures we'll then get any new info the
2666 * recovering MDS might have.
2667 *
2668 * This is a relatively heavyweight operation, but it's rare.
2669 *
2670 * called with mdsc->mutex held.
2671 */
34b6c855
SW		 2672static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2673 struct ceph_mds_session *session)
2f2dc053 2674{
2f2dc053 2675 struct ceph_msg *reply;
a105f00c 2676 struct rb_node *p;
34b6c855 2677 int mds = session->s_mds;
9abf82b8 2678 int err = -ENOMEM;
44c99757 2679 int s_nr_caps;
93cea5be 2680 struct ceph_pagelist *pagelist;
20cb34ae 2681 struct ceph_reconnect_state recon_state;
2f2dc053 2682
34b6c855 2683 pr_info("mds%d reconnect start\n", mds);
2f2dc053 2684
93cea5be
SW		 2685 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2686 if (!pagelist)
2687 goto fail_nopagelist;
2688 ceph_pagelist_init(pagelist);
2689
b61c2763 2690 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
a79832f2 2691 if (!reply)
93cea5be 2692 goto fail_nomsg;
93cea5be 2693
34b6c855
SW		 2694 mutex_lock(&session->s_mutex);
2695 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2696 session->s_seq = 0;
2f2dc053 2697
a53aab64 2698 ceph_con_close(&session->s_con);
34b6c855 2699 ceph_con_open(&session->s_con,
b7a9e5dd 2700 CEPH_ENTITY_TYPE_MDS, mds,
34b6c855 2701 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2f2dc053 2702
34b6c855
SW		 2703 /* replay unsafe requests */
2704 replay_unsafe_requests(mdsc, session);
2f2dc053
SW		 2705
2706 down_read(&mdsc->snap_rwsem);
2707
2f2dc053
SW		 2708 dout("session %p state %s\n", session,
2709 session_state_name(session->s_state));
2710
99a9c273
YZ		 2711 spin_lock(&session->s_gen_ttl_lock);
2712 session->s_cap_gen++;
2713 spin_unlock(&session->s_gen_ttl_lock);
2714
2715 spin_lock(&session->s_cap_lock);
2716 /*
2717 * notify __ceph_remove_cap() that we are composing cap reconnect.
2718 * If a cap get released before being added to the cap reconnect,
2719 * __ceph_remove_cap() should skip queuing cap release.
2720 */
2721 session->s_cap_reconnect = 1;
e01a5946
SW		 2722 /* drop old cap expires; we're about to reestablish that state */
2723 discard_cap_releases(mdsc, session);
99a9c273 2724 spin_unlock(&session->s_cap_lock);
e01a5946 2725
2f2dc053 2726 /* traverse this session's caps */
44c99757
YZ		 2727 s_nr_caps = session->s_nr_caps;
2728 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
93cea5be
SW		 2729 if (err)
2730 goto fail;
20cb34ae 2731
44c99757 2732 recon_state.nr_caps = 0;
20cb34ae
SW		 2733 recon_state.pagelist = pagelist;
2734 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2735 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2f2dc053 2736 if (err < 0)
9abf82b8 2737 goto fail;
2f2dc053 2738
99a9c273
YZ		 2739 spin_lock(&session->s_cap_lock);
2740 session->s_cap_reconnect = 0;
2741 spin_unlock(&session->s_cap_lock);
2742
2f2dc053
SW		 2743 /*
2744 * snaprealms. we provide mds with the ino, seq (version), and
2745 * parent for all of our realms. If the mds has any newer info,
2746 * it will tell us.
2747 */
a105f00c
SW		 2748 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2749 struct ceph_snap_realm *realm =
2750 rb_entry(p, struct ceph_snap_realm, node);
93cea5be 2751 struct ceph_mds_snaprealm_reconnect sr_rec;
2f2dc053
SW		 2752
2753 dout(" adding snap realm %llx seq %lld parent %llx\n",
2754 realm->ino, realm->seq, realm->parent_ino);
93cea5be
SW		 2755 sr_rec.ino = cpu_to_le64(realm->ino);
2756 sr_rec.seq = cpu_to_le64(realm->seq);
2757 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2758 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2759 if (err)
2760 goto fail;
2f2dc053 2761 }
2f2dc053 2762
20cb34ae
SW		 2763 if (recon_state.flock)
2764 reply->hdr.version = cpu_to_le16(2);
44c99757
YZ		 2765
2766 /* raced with cap release? */
2767 if (s_nr_caps != recon_state.nr_caps) {
2768 struct page *page = list_first_entry(&pagelist->head,
2769 struct page, lru);
2770 __le32 *addr = kmap_atomic(page);
2771 *addr = cpu_to_le32(recon_state.nr_caps);
2772 kunmap_atomic(addr);
ebf18f47 2773 }
44c99757
YZ		 2774
2775 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2776 ceph_msg_data_add_pagelist(reply, pagelist);
2f2dc053
SW		 2777 ceph_con_send(&session->s_con, reply);
2778
9abf82b8
SW		 2779 mutex_unlock(&session->s_mutex);
2780
2781 mutex_lock(&mdsc->mutex);
2782 __wake_requests(mdsc, &session->s_waiting);
2783 mutex_unlock(&mdsc->mutex);
2784
2f2dc053 2785 up_read(&mdsc->snap_rwsem);
2f2dc053
SW		 2786 return;
2787
93cea5be 2788fail:
2f2dc053 2789 ceph_msg_put(reply);
9abf82b8
SW		 2790 up_read(&mdsc->snap_rwsem);
2791 mutex_unlock(&session->s_mutex);
93cea5be
SW		 2792fail_nomsg:
2793 ceph_pagelist_release(pagelist);
2794 kfree(pagelist);
2795fail_nopagelist:
9abf82b8 2796 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
9abf82b8 2797 return;
2f2dc053
SW		 2798}
2799
2800
2801/*
2802 * compare old and new mdsmaps, kicking requests
2803 * and closing out old connections as necessary
2804 *
2805 * called under mdsc->mutex.
2806 */
2807static void check_new_map(struct ceph_mds_client *mdsc,
2808 struct ceph_mdsmap *newmap,
2809 struct ceph_mdsmap *oldmap)
2810{
2811 int i;
2812 int oldstate, newstate;
2813 struct ceph_mds_session *s;
2814
2815 dout("check_new_map new %u old %u\n",
2816 newmap->m_epoch, oldmap->m_epoch);
2817
2818 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2819 if (mdsc->sessions[i] == NULL)
2820 continue;
2821 s = mdsc->sessions[i];
2822 oldstate = ceph_mdsmap_get_state(oldmap, i);
2823 newstate = ceph_mdsmap_get_state(newmap, i);
2824
0deb01c9 2825 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2f2dc053 2826 i, ceph_mds_state_name(oldstate),
0deb01c9 2827 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2f2dc053 2828 ceph_mds_state_name(newstate),
0deb01c9 2829 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
2f2dc053
SW		 2830 session_state_name(s->s_state));
2831
3e8f43a0
YZ		 2832 if (i >= newmap->m_max_mds ||
2833 memcmp(ceph_mdsmap_get_addr(oldmap, i),
2f2dc053
SW		 2834 ceph_mdsmap_get_addr(newmap, i),
2835 sizeof(struct ceph_entity_addr))) {
2836 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2837 /* the session never opened, just close it
2838 * out now */
2839 __wake_requests(mdsc, &s->s_waiting);
2600d2dd 2840 __unregister_session(mdsc, s);
2f2dc053
SW		 2841 } else {
2842 /* just close it */
2843 mutex_unlock(&mdsc->mutex);
2844 mutex_lock(&s->s_mutex);
2845 mutex_lock(&mdsc->mutex);
2846 ceph_con_close(&s->s_con);
2847 mutex_unlock(&s->s_mutex);
2848 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2849 }
2850
2851 /* kick any requests waiting on the recovering mds */
29790f26 2852 kick_requests(mdsc, i);
2f2dc053
SW		 2853 } else if (oldstate == newstate) {
2854 continue; /* nothing new with this mds */
2855 }
2856
2857 /*
2858 * send reconnect?
2859 */
2860 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 2861 newstate >= CEPH_MDS_STATE_RECONNECT) {
2862 mutex_unlock(&mdsc->mutex);
2863 send_mds_reconnect(mdsc, s);
2864 mutex_lock(&mdsc->mutex);
2865 }
2f2dc053
SW		 2866
2867 /*
29790f26 2868 * kick request on any mds that has gone active.
2f2dc053
SW		 2869 */
2870 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
2871 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 2872 if (oldstate != CEPH_MDS_STATE_CREATING &&
2873 oldstate != CEPH_MDS_STATE_STARTING)
2874 pr_info("mds%d recovery completed\n", s->s_mds);
2875 kick_requests(mdsc, i);
2f2dc053 2876 ceph_kick_flushing_caps(mdsc, s);
0dc2570f 2877 wake_up_session_caps(s, 1);
2f2dc053
SW		 2878 }
2879 }
cb170a22
SW		 2880
2881 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
2882 s = mdsc->sessions[i];
2883 if (!s)
2884 continue;
2885 if (!ceph_mdsmap_is_laggy(newmap, i))
2886 continue;
2887 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2888 s->s_state == CEPH_MDS_SESSION_HUNG ||
2889 s->s_state == CEPH_MDS_SESSION_CLOSING) {
2890 dout(" connecting to export targets of laggy mds%d\n",
2891 i);
2892 __open_export_target_sessions(mdsc, s);
2893 }
2894 }
2f2dc053
SW		 2895}
2896
2897
2898
2899/*
2900 * leases
2901 */
2902
2903/*
2904 * caller must hold session s_mutex, dentry->d_lock
2905 */
2906void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
2907{
2908 struct ceph_dentry_info *di = ceph_dentry(dentry);
2909
2910 ceph_put_mds_session(di->lease_session);
2911 di->lease_session = NULL;
2912}
2913
2600d2dd
SW		 2914static void handle_lease(struct ceph_mds_client *mdsc,
2915 struct ceph_mds_session *session,
2916 struct ceph_msg *msg)
2f2dc053 2917{
3d14c5d2 2918 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 2919 struct inode *inode;
2f2dc053
SW		 2920 struct dentry *parent, *dentry;
2921 struct ceph_dentry_info *di;
2600d2dd 2922 int mds = session->s_mds;
2f2dc053 2923 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 2924 u32 seq;
2f2dc053 2925 struct ceph_vino vino;
2f2dc053
SW		 2926 struct qstr dname;
2927 int release = 0;
2928
2f2dc053
SW		 2929 dout("handle_lease from mds%d\n", mds);
2930
2931 /* decode */
2932 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
2933 goto bad;
2934 vino.ino = le64_to_cpu(h->ino);
2935 vino.snap = CEPH_NOSNAP;
1e5ea23d 2936 seq = le32_to_cpu(h->seq);
2f2dc053
SW		 2937 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
2938 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
2939 if (dname.len != get_unaligned_le32(h+1))
2940 goto bad;
2941
2f2dc053
SW		 2942 mutex_lock(&session->s_mutex);
2943 session->s_seq++;
2944
2945 /* lookup inode */
2946 inode = ceph_find_inode(sb, vino);
2f90b852
SW		 2947 dout("handle_lease %s, ino %llx %p %.*s\n",
2948 ceph_lease_op_name(h->action), vino.ino, inode,
1e5ea23d 2949 dname.len, dname.name);
2f2dc053
SW		 2950 if (inode == NULL) {
2951 dout("handle_lease no inode %llx\n", vino.ino);
2952 goto release;
2953 }
2f2dc053
SW		 2954
2955 /* dentry */
2956 parent = d_find_alias(inode);
2957 if (!parent) {
2958 dout("no parent dentry on inode %p\n", inode);
2959 WARN_ON(1);
2960 goto release; /* hrm... */
2961 }
2962 dname.hash = full_name_hash(dname.name, dname.len);
2963 dentry = d_lookup(parent, &dname);
2964 dput(parent);
2965 if (!dentry)
2966 goto release;
2967
2968 spin_lock(&dentry->d_lock);
2969 di = ceph_dentry(dentry);
2970 switch (h->action) {
2971 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 2972 if (di->lease_session == session) {
1e5ea23d
SW		 2973 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
2974 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 2975 __ceph_mdsc_drop_dentry_lease(dentry);
2976 }
2977 release = 1;
2978 break;
2979
2980 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 2981 if (di->lease_session == session &&
2f2dc053
SW		 2982 di->lease_gen == session->s_cap_gen &&
2983 di->lease_renew_from &&
2984 di->lease_renew_after == 0) {
2985 unsigned long duration =
2986 le32_to_cpu(h->duration_ms) * HZ / 1000;
2987
1e5ea23d 2988 di->lease_seq = seq;
2f2dc053
SW		 2989 dentry->d_time = di->lease_renew_from + duration;
2990 di->lease_renew_after = di->lease_renew_from +
2991 (duration >> 1);
2992 di->lease_renew_from = 0;
2993 }
2994 break;
2995 }
2996 spin_unlock(&dentry->d_lock);
2997 dput(dentry);
2998
2999 if (!release)
3000 goto out;
3001
3002release:
3003 /* let's just reuse the same message */
3004 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3005 ceph_msg_get(msg);
3006 ceph_con_send(&session->s_con, msg);
3007
3008out:
3009 iput(inode);
3010 mutex_unlock(&session->s_mutex);
2f2dc053
SW		 3011 return;
3012
3013bad:
3014 pr_err("corrupt lease message\n");
9ec7cab1 3015 ceph_msg_dump(msg);
2f2dc053
SW		 3016}
3017
3018void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3019 struct inode *inode,
3020 struct dentry *dentry, char action,
3021 u32 seq)
3022{
3023 struct ceph_msg *msg;
3024 struct ceph_mds_lease *lease;
3025 int len = sizeof(*lease) + sizeof(u32);
3026 int dnamelen = 0;
3027
3028 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3029 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3030 dnamelen = dentry->d_name.len;
3031 len += dnamelen;
3032
b61c2763 3033 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 3034 if (!msg)
2f2dc053
SW		 3035 return;
3036 lease = msg->front.iov_base;
3037 lease->action = action;
2f2dc053
SW		 3038 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3039 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3040 lease->seq = cpu_to_le32(seq);
3041 put_unaligned_le32(dnamelen, lease + 1);
3042 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3043
3044 /*
3045 * if this is a preemptive lease RELEASE, no need to
3046 * flush request stream, since the actual request will
3047 * soon follow.
3048 */
3049 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3050
3051 ceph_con_send(&session->s_con, msg);
3052}
3053
3054/*
3055 * Preemptively release a lease we expect to invalidate anyway.
3056 * Pass @inode always, @dentry is optional.
3057 */
3058void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2f90b852 3059 struct dentry *dentry)
2f2dc053
SW		 3060{
3061 struct ceph_dentry_info *di;
3062 struct ceph_mds_session *session;
3063 u32 seq;
3064
3065 BUG_ON(inode == NULL);
3066 BUG_ON(dentry == NULL);
2f2dc053
SW		 3067
3068 /* is dentry lease valid? */
3069 spin_lock(&dentry->d_lock);
3070 di = ceph_dentry(dentry);
3071 if (!di || !di->lease_session ||
3072 di->lease_session->s_mds < 0 ||
3073 di->lease_gen != di->lease_session->s_cap_gen ||
3074 !time_before(jiffies, dentry->d_time)) {
3075 dout("lease_release inode %p dentry %p -- "
2f90b852
SW		 3076 "no lease\n",
3077 inode, dentry);
2f2dc053
SW		 3078 spin_unlock(&dentry->d_lock);
3079 return;
3080 }
3081
3082 /* we do have a lease on this dentry; note mds and seq */
3083 session = ceph_get_mds_session(di->lease_session);
3084 seq = di->lease_seq;
3085 __ceph_mdsc_drop_dentry_lease(dentry);
3086 spin_unlock(&dentry->d_lock);
3087
2f90b852
SW		 3088 dout("lease_release inode %p dentry %p to mds%d\n",
3089 inode, dentry, session->s_mds);
2f2dc053
SW		 3090 ceph_mdsc_lease_send_msg(session, inode, dentry,
3091 CEPH_MDS_LEASE_RELEASE, seq);
3092 ceph_put_mds_session(session);
3093}
3094
3095/*
3096 * drop all leases (and dentry refs) in preparation for umount
3097 */
3098static void drop_leases(struct ceph_mds_client *mdsc)
3099{
3100 int i;
3101
3102 dout("drop_leases\n");
3103 mutex_lock(&mdsc->mutex);
3104 for (i = 0; i < mdsc->max_sessions; i++) {
3105 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3106 if (!s)
3107 continue;
3108 mutex_unlock(&mdsc->mutex);
3109 mutex_lock(&s->s_mutex);
3110 mutex_unlock(&s->s_mutex);
3111 ceph_put_mds_session(s);
3112 mutex_lock(&mdsc->mutex);
3113 }
3114 mutex_unlock(&mdsc->mutex);
3115}
3116
3117
3118
3119/*
3120 * delayed work -- periodically trim expired leases, renew caps with mds
3121 */
3122static void schedule_delayed(struct ceph_mds_client *mdsc)
3123{
3124 int delay = 5;
3125 unsigned hz = round_jiffies_relative(HZ * delay);
3126 schedule_delayed_work(&mdsc->delayed_work, hz);
3127}
3128
3129static void delayed_work(struct work_struct *work)
3130{
3131 int i;
3132 struct ceph_mds_client *mdsc =
3133 container_of(work, struct ceph_mds_client, delayed_work.work);
3134 int renew_interval;
3135 int renew_caps;
3136
3137 dout("mdsc delayed_work\n");
afcdaea3 3138 ceph_check_delayed_caps(mdsc);
2f2dc053
SW		 3139
3140 mutex_lock(&mdsc->mutex);
3141 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3142 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3143 mdsc->last_renew_caps);
3144 if (renew_caps)
3145 mdsc->last_renew_caps = jiffies;
3146
3147 for (i = 0; i < mdsc->max_sessions; i++) {
3148 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3149 if (s == NULL)
3150 continue;
3151 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3152 dout("resending session close request for mds%d\n",
3153 s->s_mds);
3154 request_close_session(mdsc, s);
3155 ceph_put_mds_session(s);
3156 continue;
3157 }
3158 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3159 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3160 s->s_state = CEPH_MDS_SESSION_HUNG;
3161 pr_info("mds%d hung\n", s->s_mds);
3162 }
3163 }
3164 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3165 /* this mds is failed or recovering, just wait */
3166 ceph_put_mds_session(s);
3167 continue;
3168 }
3169 mutex_unlock(&mdsc->mutex);
3170
3171 mutex_lock(&s->s_mutex);
3172 if (renew_caps)
3173 send_renew_caps(mdsc, s);
3174 else
3175 ceph_con_keepalive(&s->s_con);
ee6b272b 3176 ceph_add_cap_releases(mdsc, s);
aab53dd9
SW		 3177 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3178 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 3179 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 3180 mutex_unlock(&s->s_mutex);
3181 ceph_put_mds_session(s);
3182
3183 mutex_lock(&mdsc->mutex);
3184 }
3185 mutex_unlock(&mdsc->mutex);
3186
3187 schedule_delayed(mdsc);
3188}
3189
3d14c5d2 3190int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 3191
2f2dc053 3192{
3d14c5d2
YS		 3193 struct ceph_mds_client *mdsc;
3194
3195 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3196 if (!mdsc)
3197 return -ENOMEM;
3198 mdsc->fsc = fsc;
3199 fsc->mdsc = mdsc;
2f2dc053
SW		 3200 mutex_init(&mdsc->mutex);
3201 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
fb3101b6 3202 if (mdsc->mdsmap == NULL) {
3203 kfree(mdsc);
2d06eeb8 3204 return -ENOMEM;
fb3101b6 3205 }
2d06eeb8 3206
2f2dc053 3207 init_completion(&mdsc->safe_umount_waiters);
f3c60c59 3208 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053
SW		 3209 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3210 mdsc->sessions = NULL;
3211 mdsc->max_sessions = 0;
3212 mdsc->stopping = 0;
3213 init_rwsem(&mdsc->snap_rwsem);
a105f00c 3214 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 3215 INIT_LIST_HEAD(&mdsc->snap_empty);
3216 spin_lock_init(&mdsc->snap_empty_lock);
3217 mdsc->last_tid = 0;
44ca18f2 3218 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 3219 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3220 mdsc->last_renew_caps = jiffies;
3221 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3222 spin_lock_init(&mdsc->cap_delay_lock);
3223 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3224 spin_lock_init(&mdsc->snap_flush_lock);
3225 mdsc->cap_flush_seq = 0;
3226 INIT_LIST_HEAD(&mdsc->cap_dirty);
db354052 3227 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 3228 mdsc->num_cap_flushing = 0;
3229 spin_lock_init(&mdsc->cap_dirty_lock);
3230 init_waitqueue_head(&mdsc->cap_flushing_wq);
3231 spin_lock_init(&mdsc->dentry_lru_lock);
3232 INIT_LIST_HEAD(&mdsc->dentry_lru);
2d06eeb8 3233
37151668 3234 ceph_caps_init(mdsc);
3d14c5d2 3235 ceph_adjust_min_caps(mdsc, fsc->min_caps);
37151668 3236
5f44f142 3237 return 0;
2f2dc053
SW		 3238}
3239
3240/*
3241 * Wait for safe replies on open mds requests. If we time out, drop
3242 * all requests from the tree to avoid dangling dentry refs.
3243 */
3244static void wait_requests(struct ceph_mds_client *mdsc)
3245{
3246 struct ceph_mds_request *req;
3d14c5d2 3247 struct ceph_fs_client *fsc = mdsc->fsc;
2f2dc053
SW		 3248
3249 mutex_lock(&mdsc->mutex);
44ca18f2 3250 if (__get_oldest_req(mdsc)) {
2f2dc053 3251 mutex_unlock(&mdsc->mutex);
44ca18f2 3252
2f2dc053
SW		 3253 dout("wait_requests waiting for requests\n");
3254 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3d14c5d2 3255 fsc->client->options->mount_timeout * HZ);
2f2dc053
SW		 3256
3257 /* tear down remaining requests */
44ca18f2
SW		 3258 mutex_lock(&mdsc->mutex);
3259 while ((req = __get_oldest_req(mdsc))) {
2f2dc053
SW		 3260 dout("wait_requests timed out on tid %llu\n",
3261 req->r_tid);
44ca18f2 3262 __unregister_request(mdsc, req);
2f2dc053
SW		 3263 }
3264 }
3265 mutex_unlock(&mdsc->mutex);
3266 dout("wait_requests done\n");
3267}
3268
3269/*
3270 * called before mount is ro, and before dentries are torn down.
3271 * (hmm, does this still race with new lookups?)
3272 */
3273void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3274{
3275 dout("pre_umount\n");
3276 mdsc->stopping = 1;
3277
3278 drop_leases(mdsc);
afcdaea3 3279 ceph_flush_dirty_caps(mdsc);
2f2dc053 3280 wait_requests(mdsc);
17c688c3
SW		 3281
3282 /*
3283 * wait for reply handlers to drop their request refs and
3284 * their inode/dcache refs
3285 */
3286 ceph_msgr_flush();
2f2dc053
SW		 3287}
3288
3289/*
3290 * wait for all write mds requests to flush.
3291 */
3292static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3293{
80fc7314 3294 struct ceph_mds_request *req = NULL, *nextreq;
44ca18f2 3295 struct rb_node *n;
2f2dc053
SW		 3296
3297 mutex_lock(&mdsc->mutex);
3298 dout("wait_unsafe_requests want %lld\n", want_tid);
80fc7314 3299restart:
44ca18f2
SW		 3300 req = __get_oldest_req(mdsc);
3301 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 3302 /* find next request */
3303 n = rb_next(&req->r_node);
3304 if (n)
3305 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3306 else
3307 nextreq = NULL;
44ca18f2
SW		 3308 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
3309 /* write op */
3310 ceph_mdsc_get_request(req);
80fc7314
SW		 3311 if (nextreq)
3312 ceph_mdsc_get_request(nextreq);
44ca18f2
SW		 3313 mutex_unlock(&mdsc->mutex);
3314 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3315 req->r_tid, want_tid);
3316 wait_for_completion(&req->r_safe_completion);
3317 mutex_lock(&mdsc->mutex);
44ca18f2 3318 ceph_mdsc_put_request(req);
80fc7314
SW		 3319 if (!nextreq)
3320 break; /* next dne before, so we're done! */
3321 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3322 /* next request was removed from tree */
3323 ceph_mdsc_put_request(nextreq);
3324 goto restart;
3325 }
3326 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 3327 }
80fc7314 3328 req = nextreq;
2f2dc053
SW		 3329 }
3330 mutex_unlock(&mdsc->mutex);
3331 dout("wait_unsafe_requests done\n");
3332}
3333
3334void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3335{
3336 u64 want_tid, want_flush;
3337
3d14c5d2 3338 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 3339 return;
3340
2f2dc053
SW		 3341 dout("sync\n");
3342 mutex_lock(&mdsc->mutex);
3343 want_tid = mdsc->last_tid;
3344 want_flush = mdsc->cap_flush_seq;
3345 mutex_unlock(&mdsc->mutex);
3346 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
3347
afcdaea3 3348 ceph_flush_dirty_caps(mdsc);
2f2dc053
SW		 3349
3350 wait_unsafe_requests(mdsc, want_tid);
3351 wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
3352}
3353
f3c60c59
SW		 3354/*
3355 * true if all sessions are closed, or we force unmount
3356 */
7fd7d101 3357static bool done_closing_sessions(struct ceph_mds_client *mdsc)
f3c60c59
SW		 3358{
3359 int i, n = 0;
3360
3d14c5d2 3361 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
f3c60c59
SW		 3362 return true;
3363
3364 mutex_lock(&mdsc->mutex);
3365 for (i = 0; i < mdsc->max_sessions; i++)
3366 if (mdsc->sessions[i])
3367 n++;
3368 mutex_unlock(&mdsc->mutex);
3369 return n == 0;
3370}
2f2dc053
SW		 3371
3372/*
3373 * called after sb is ro.
3374 */
3375void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3376{
3377 struct ceph_mds_session *session;
3378 int i;
3d14c5d2
YS		 3379 struct ceph_fs_client *fsc = mdsc->fsc;
3380 unsigned long timeout = fsc->client->options->mount_timeout * HZ;
2f2dc053
SW		 3381
3382 dout("close_sessions\n");
3383
2f2dc053 3384 /* close sessions */
f3c60c59
SW		 3385 mutex_lock(&mdsc->mutex);
3386 for (i = 0; i < mdsc->max_sessions; i++) {
3387 session = __ceph_lookup_mds_session(mdsc, i);
3388 if (!session)
3389 continue;
2f2dc053 3390 mutex_unlock(&mdsc->mutex);
f3c60c59
SW		 3391 mutex_lock(&session->s_mutex);
3392 __close_session(mdsc, session);
3393 mutex_unlock(&session->s_mutex);
3394 ceph_put_mds_session(session);
2f2dc053
SW		 3395 mutex_lock(&mdsc->mutex);
3396 }
f3c60c59
SW		 3397 mutex_unlock(&mdsc->mutex);
3398
3399 dout("waiting for sessions to close\n");
3400 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3401 timeout);
2f2dc053
SW		 3402
3403 /* tear down remaining sessions */
f3c60c59 3404 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 3405 for (i = 0; i < mdsc->max_sessions; i++) {
3406 if (mdsc->sessions[i]) {
3407 session = get_session(mdsc->sessions[i]);
2600d2dd 3408 __unregister_session(mdsc, session);
2f2dc053
SW		 3409 mutex_unlock(&mdsc->mutex);
3410 mutex_lock(&session->s_mutex);
3411 remove_session_caps(session);
3412 mutex_unlock(&session->s_mutex);
3413 ceph_put_mds_session(session);
3414 mutex_lock(&mdsc->mutex);
3415 }
3416 }
2f2dc053 3417 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 3418 mutex_unlock(&mdsc->mutex);
3419
3420 ceph_cleanup_empty_realms(mdsc);
3421
3422 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3423
3424 dout("stopped\n");
3425}
3426
3d14c5d2 3427static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053
SW		 3428{
3429 dout("stop\n");
3430 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3431 if (mdsc->mdsmap)
3432 ceph_mdsmap_destroy(mdsc->mdsmap);
3433 kfree(mdsc->sessions);
37151668 3434 ceph_caps_finalize(mdsc);
2f2dc053
SW		 3435}
3436
3d14c5d2
YS		 3437void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3438{
3439 struct ceph_mds_client *mdsc = fsc->mdsc;
3440
ef550f6f 3441 dout("mdsc_destroy %p\n", mdsc);
3d14c5d2 3442 ceph_mdsc_stop(mdsc);
ef550f6f
SW		 3443
3444 /* flush out any connection work with references to us */
3445 ceph_msgr_flush();
3446
3d14c5d2
YS		 3447 fsc->mdsc = NULL;
3448 kfree(mdsc);
ef550f6f 3449 dout("mdsc_destroy %p done\n", mdsc);
3d14c5d2
YS		 3450}
3451
2f2dc053
SW		 3452
3453/*
3454 * handle mds map update.
3455 */
3456void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3457{
3458 u32 epoch;
3459 u32 maplen;
3460 void *p = msg->front.iov_base;
3461 void *end = p + msg->front.iov_len;
3462 struct ceph_mdsmap *newmap, *oldmap;
3463 struct ceph_fsid fsid;
3464 int err = -EINVAL;
3465
3466 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3467 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 3468 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 3469 return;
c89136ea
SW		 3470 epoch = ceph_decode_32(&p);
3471 maplen = ceph_decode_32(&p);
2f2dc053
SW		 3472 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3473
3474 /* do we need it? */
3d14c5d2 3475 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
2f2dc053
SW		 3476 mutex_lock(&mdsc->mutex);
3477 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3478 dout("handle_map epoch %u <= our %u\n",
3479 epoch, mdsc->mdsmap->m_epoch);
3480 mutex_unlock(&mdsc->mutex);
3481 return;
3482 }
3483
3484 newmap = ceph_mdsmap_decode(&p, end);
3485 if (IS_ERR(newmap)) {
3486 err = PTR_ERR(newmap);
3487 goto bad_unlock;
3488 }
3489
3490 /* swap into place */
3491 if (mdsc->mdsmap) {
3492 oldmap = mdsc->mdsmap;
3493 mdsc->mdsmap = newmap;
3494 check_new_map(mdsc, newmap, oldmap);
3495 ceph_mdsmap_destroy(oldmap);
3496 } else {
3497 mdsc->mdsmap = newmap; /* first mds map */
3498 }
3d14c5d2 3499 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
2f2dc053
SW		 3500
3501 __wake_requests(mdsc, &mdsc->waiting_for_map);
3502
3503 mutex_unlock(&mdsc->mutex);
3504 schedule_delayed(mdsc);
3505 return;
3506
3507bad_unlock:
3508 mutex_unlock(&mdsc->mutex);
3509bad:
3510 pr_err("error decoding mdsmap %d\n", err);
3511 return;
3512}
3513
3514static struct ceph_connection *con_get(struct ceph_connection *con)
3515{
3516 struct ceph_mds_session *s = con->private;
3517
3518 if (get_session(s)) {
2600d2dd 3519 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
2f2dc053
SW		 3520 return con;
3521 }
3522 dout("mdsc con_get %p FAIL\n", s);
3523 return NULL;
3524}
3525
3526static void con_put(struct ceph_connection *con)
3527{
3528 struct ceph_mds_session *s = con->private;
3529
7d8e18a6 3530 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
2f2dc053
SW		 3531 ceph_put_mds_session(s);
3532}
3533
3534/*
3535 * if the client is unresponsive for long enough, the mds will kill
3536 * the session entirely.
3537 */
3538static void peer_reset(struct ceph_connection *con)
3539{
3540 struct ceph_mds_session *s = con->private;
7e70f0ed 3541 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 3542
f3ae1b97 3543 pr_warn("mds%d closed our session\n", s->s_mds);
7e70f0ed 3544 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 3545}
3546
3547static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3548{
3549 struct ceph_mds_session *s = con->private;
3550 struct ceph_mds_client *mdsc = s->s_mdsc;
3551 int type = le16_to_cpu(msg->hdr.type);
3552
2600d2dd
SW		 3553 mutex_lock(&mdsc->mutex);
3554 if (__verify_registered_session(mdsc, s) < 0) {
3555 mutex_unlock(&mdsc->mutex);
3556 goto out;
3557 }
3558 mutex_unlock(&mdsc->mutex);
3559
2f2dc053
SW		 3560 switch (type) {
3561 case CEPH_MSG_MDS_MAP:
3562 ceph_mdsc_handle_map(mdsc, msg);
3563 break;
3564 case CEPH_MSG_CLIENT_SESSION:
3565 handle_session(s, msg);
3566 break;
3567 case CEPH_MSG_CLIENT_REPLY:
3568 handle_reply(s, msg);
3569 break;
3570 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 3571 handle_forward(mdsc, s, msg);
2f2dc053
SW		 3572 break;
3573 case CEPH_MSG_CLIENT_CAPS:
3574 ceph_handle_caps(s, msg);
3575 break;
3576 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 3577 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 3578 break;
3579 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 3580 handle_lease(mdsc, s, msg);
2f2dc053
SW		 3581 break;
3582
3583 default:
3584 pr_err("received unknown message type %d %s\n", type,
3585 ceph_msg_type_name(type));
3586 }
2600d2dd 3587out:
2f2dc053
SW		 3588 ceph_msg_put(msg);
3589}
3590
4e7a5dcd
SW		 3591/*
3592 * authentication
3593 */
a3530df3
AE		 3594
3595/*
3596 * Note: returned pointer is the address of a structure that's
3597 * managed separately. Caller must *not* attempt to free it.
3598 */
3599static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 3600 int *proto, int force_new)
4e7a5dcd
SW		 3601{
3602 struct ceph_mds_session *s = con->private;
3603 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3604 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 3605 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 3606
74f1869f 3607 if (force_new && auth->authorizer) {
27859f97 3608 ceph_auth_destroy_authorizer(ac, auth->authorizer);
74f1869f 3609 auth->authorizer = NULL;
4e7a5dcd 3610 }
27859f97
SW		 3611 if (!auth->authorizer) {
3612 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3613 auth);
0bed9b5c
SW		 3614 if (ret)
3615 return ERR_PTR(ret);
27859f97
SW		 3616 } else {
3617 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3618 auth);
a255651d 3619 if (ret)
a3530df3 3620 return ERR_PTR(ret);
4e7a5dcd 3621 }
4e7a5dcd 3622 *proto = ac->protocol;
74f1869f 3623
a3530df3 3624 return auth;
4e7a5dcd
SW		 3625}
3626
3627
3628static int verify_authorizer_reply(struct ceph_connection *con, int len)
3629{
3630 struct ceph_mds_session *s = con->private;
3631 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3632 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4e7a5dcd 3633
27859f97 3634 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
4e7a5dcd
SW		 3635}
3636
9bd2e6f8
SW		 3637static int invalidate_authorizer(struct ceph_connection *con)
3638{
3639 struct ceph_mds_session *s = con->private;
3640 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3641 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 3642
27859f97 3643 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 3644
3d14c5d2 3645 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 3646}
3647
53ded495
AE		 3648static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3649 struct ceph_msg_header *hdr, int *skip)
3650{
3651 struct ceph_msg *msg;
3652 int type = (int) le16_to_cpu(hdr->type);
3653 int front_len = (int) le32_to_cpu(hdr->front_len);
3654
3655 if (con->in_msg)
3656 return con->in_msg;
3657
3658 *skip = 0;
3659 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3660 if (!msg) {
3661 pr_err("unable to allocate msg type %d len %d\n",
3662 type, front_len);
3663 return NULL;
3664 }
53ded495
AE		 3665
3666 return msg;
3667}
3668
9e32789f 3669static const struct ceph_connection_operations mds_con_ops = {
2f2dc053
SW		 3670 .get = con_get,
3671 .put = con_put,
3672 .dispatch = dispatch,
4e7a5dcd
SW		 3673 .get_authorizer = get_authorizer,
3674 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 3675 .invalidate_authorizer = invalidate_authorizer,
2f2dc053 3676 .peer_reset = peer_reset,
53ded495 3677 .alloc_msg = mds_alloc_msg,
2f2dc053
SW		 3678};
3679
2f2dc053 3680/* eof */
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