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ceph: remove redundant declaration
[mirror_ubuntu-hirsute-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>
dbd0c8bf 10#include <linux/utsname.h>
2f2dc053 11
2f2dc053 12#include "super.h"
3d14c5d2
YS		 13#include "mds_client.h"
14
1fe60e51 15#include <linux/ceph/ceph_features.h>
3d14c5d2
YS		 16#include <linux/ceph/messenger.h>
17#include <linux/ceph/decode.h>
18#include <linux/ceph/pagelist.h>
19#include <linux/ceph/auth.h>
20#include <linux/ceph/debugfs.h>
2f2dc053
SW		 21
22/*
23 * A cluster of MDS (metadata server) daemons is responsible for
24 * managing the file system namespace (the directory hierarchy and
25 * inodes) and for coordinating shared access to storage. Metadata is
26 * partitioning hierarchically across a number of servers, and that
27 * partition varies over time as the cluster adjusts the distribution
28 * in order to balance load.
29 *
30 * The MDS client is primarily responsible to managing synchronous
31 * metadata requests for operations like open, unlink, and so forth.
32 * If there is a MDS failure, we find out about it when we (possibly
33 * request and) receive a new MDS map, and can resubmit affected
34 * requests.
35 *
36 * For the most part, though, we take advantage of a lossless
37 * communications channel to the MDS, and do not need to worry about
38 * timing out or resubmitting requests.
39 *
40 * We maintain a stateful "session" with each MDS we interact with.
41 * Within each session, we sent periodic heartbeat messages to ensure
42 * any capabilities or leases we have been issues remain valid. If
43 * the session times out and goes stale, our leases and capabilities
44 * are no longer valid.
45 */
46
20cb34ae 47struct ceph_reconnect_state {
44c99757 48 int nr_caps;
20cb34ae
SW		 49 struct ceph_pagelist *pagelist;
50 bool flock;
51};
52
2f2dc053
SW		 53static void __wake_requests(struct ceph_mds_client *mdsc,
54 struct list_head *head);
55
9e32789f 56static const struct ceph_connection_operations mds_con_ops;
2f2dc053
SW		 57
58
59/*
60 * mds reply parsing
61 */
62
63/*
64 * parse individual inode info
65 */
66static int parse_reply_info_in(void **p, void *end,
14303d20 67 struct ceph_mds_reply_info_in *info,
12b4629a 68 u64 features)
2f2dc053
SW		 69{
70 int err = -EIO;
71
72 info->in = *p;
73 *p += sizeof(struct ceph_mds_reply_inode) +
74 sizeof(*info->in->fragtree.splits) *
75 le32_to_cpu(info->in->fragtree.nsplits);
76
77 ceph_decode_32_safe(p, end, info->symlink_len, bad);
78 ceph_decode_need(p, end, info->symlink_len, bad);
79 info->symlink = *p;
80 *p += info->symlink_len;
81
14303d20
SW		 82 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
83 ceph_decode_copy_safe(p, end, &info->dir_layout,
84 sizeof(info->dir_layout), bad);
85 else
86 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
87
2f2dc053
SW		 88 ceph_decode_32_safe(p, end, info->xattr_len, bad);
89 ceph_decode_need(p, end, info->xattr_len, bad);
90 info->xattr_data = *p;
91 *p += info->xattr_len;
fb01d1f8
YZ		 92
93 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
94 ceph_decode_64_safe(p, end, info->inline_version, bad);
95 ceph_decode_32_safe(p, end, info->inline_len, bad);
96 ceph_decode_need(p, end, info->inline_len, bad);
97 info->inline_data = *p;
98 *p += info->inline_len;
99 } else
100 info->inline_version = CEPH_INLINE_NONE;
101
2f2dc053
SW		 102 return 0;
103bad:
104 return err;
105}
106
107/*
108 * parse a normal reply, which may contain a (dir+)dentry and/or a
109 * target inode.
110 */
111static int parse_reply_info_trace(void **p, void *end,
14303d20 112 struct ceph_mds_reply_info_parsed *info,
12b4629a 113 u64 features)
2f2dc053
SW		 114{
115 int err;
116
117 if (info->head->is_dentry) {
14303d20 118 err = parse_reply_info_in(p, end, &info->diri, features);
2f2dc053
SW		 119 if (err < 0)
120 goto out_bad;
121
122 if (unlikely(*p + sizeof(*info->dirfrag) > end))
123 goto bad;
124 info->dirfrag = *p;
125 *p += sizeof(*info->dirfrag) +
126 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
127 if (unlikely(*p > end))
128 goto bad;
129
130 ceph_decode_32_safe(p, end, info->dname_len, bad);
131 ceph_decode_need(p, end, info->dname_len, bad);
132 info->dname = *p;
133 *p += info->dname_len;
134 info->dlease = *p;
135 *p += sizeof(*info->dlease);
136 }
137
138 if (info->head->is_target) {
14303d20 139 err = parse_reply_info_in(p, end, &info->targeti, features);
2f2dc053
SW		 140 if (err < 0)
141 goto out_bad;
142 }
143
144 if (unlikely(*p != end))
145 goto bad;
146 return 0;
147
148bad:
149 err = -EIO;
150out_bad:
151 pr_err("problem parsing mds trace %d\n", err);
152 return err;
153}
154
155/*
156 * parse readdir results
157 */
158static int parse_reply_info_dir(void **p, void *end,
14303d20 159 struct ceph_mds_reply_info_parsed *info,
12b4629a 160 u64 features)
2f2dc053
SW		 161{
162 u32 num, i = 0;
163 int err;
164
165 info->dir_dir = *p;
166 if (*p + sizeof(*info->dir_dir) > end)
167 goto bad;
168 *p += sizeof(*info->dir_dir) +
169 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
170 if (*p > end)
171 goto bad;
172
173 ceph_decode_need(p, end, sizeof(num) + 2, bad);
c89136ea
SW		 174 num = ceph_decode_32(p);
175 info->dir_end = ceph_decode_8(p);
176 info->dir_complete = ceph_decode_8(p);
2f2dc053
SW		 177 if (num == 0)
178 goto done;
179
54008399 180 BUG_ON(!info->dir_in);
2f2dc053
SW		 181 info->dir_dname = (void *)(info->dir_in + num);
182 info->dir_dname_len = (void *)(info->dir_dname + num);
183 info->dir_dlease = (void *)(info->dir_dname_len + num);
54008399
YZ		 184 if ((unsigned long)(info->dir_dlease + num) >
185 (unsigned long)info->dir_in + info->dir_buf_size) {
186 pr_err("dir contents are larger than expected\n");
187 WARN_ON(1);
188 goto bad;
189 }
2f2dc053 190
54008399 191 info->dir_nr = num;
2f2dc053
SW		 192 while (num) {
193 /* dentry */
194 ceph_decode_need(p, end, sizeof(u32)*2, bad);
c89136ea 195 info->dir_dname_len[i] = ceph_decode_32(p);
2f2dc053
SW		 196 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
197 info->dir_dname[i] = *p;
198 *p += info->dir_dname_len[i];
199 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
200 info->dir_dname[i]);
201 info->dir_dlease[i] = *p;
202 *p += sizeof(struct ceph_mds_reply_lease);
203
204 /* inode */
14303d20 205 err = parse_reply_info_in(p, end, &info->dir_in[i], features);
2f2dc053
SW		 206 if (err < 0)
207 goto out_bad;
208 i++;
209 num--;
210 }
211
212done:
213 if (*p != end)
214 goto bad;
215 return 0;
216
217bad:
218 err = -EIO;
219out_bad:
220 pr_err("problem parsing dir contents %d\n", err);
221 return err;
222}
223
25933abd
HS		 224/*
225 * parse fcntl F_GETLK results
226 */
227static int parse_reply_info_filelock(void **p, void *end,
14303d20 228 struct ceph_mds_reply_info_parsed *info,
12b4629a 229 u64 features)
25933abd
HS		 230{
231 if (*p + sizeof(*info->filelock_reply) > end)
232 goto bad;
233
234 info->filelock_reply = *p;
235 *p += sizeof(*info->filelock_reply);
236
237 if (unlikely(*p != end))
238 goto bad;
239 return 0;
240
241bad:
242 return -EIO;
243}
244
6e8575fa
SL		 245/*
246 * parse create results
247 */
248static int parse_reply_info_create(void **p, void *end,
249 struct ceph_mds_reply_info_parsed *info,
12b4629a 250 u64 features)
6e8575fa
SL		 251{
252 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
253 if (*p == end) {
254 info->has_create_ino = false;
255 } else {
256 info->has_create_ino = true;
257 info->ino = ceph_decode_64(p);
258 }
259 }
260
261 if (unlikely(*p != end))
262 goto bad;
263 return 0;
264
265bad:
266 return -EIO;
267}
268
25933abd
HS		 269/*
270 * parse extra results
271 */
272static int parse_reply_info_extra(void **p, void *end,
14303d20 273 struct ceph_mds_reply_info_parsed *info,
12b4629a 274 u64 features)
25933abd
HS		 275{
276 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
14303d20 277 return parse_reply_info_filelock(p, end, info, features);
8a034497
YZ		 278 else if (info->head->op == CEPH_MDS_OP_READDIR ||
279 info->head->op == CEPH_MDS_OP_LSSNAP)
14303d20 280 return parse_reply_info_dir(p, end, info, features);
6e8575fa
SL		 281 else if (info->head->op == CEPH_MDS_OP_CREATE)
282 return parse_reply_info_create(p, end, info, features);
283 else
284 return -EIO;
25933abd
HS		 285}
286
2f2dc053
SW		 287/*
288 * parse entire mds reply
289 */
290static int parse_reply_info(struct ceph_msg *msg,
14303d20 291 struct ceph_mds_reply_info_parsed *info,
12b4629a 292 u64 features)
2f2dc053
SW		 293{
294 void *p, *end;
295 u32 len;
296 int err;
297
298 info->head = msg->front.iov_base;
299 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
300 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
301
302 /* trace */
303 ceph_decode_32_safe(&p, end, len, bad);
304 if (len > 0) {
32852a81 305 ceph_decode_need(&p, end, len, bad);
14303d20 306 err = parse_reply_info_trace(&p, p+len, info, features);
2f2dc053
SW		 307 if (err < 0)
308 goto out_bad;
309 }
310
25933abd 311 /* extra */
2f2dc053
SW		 312 ceph_decode_32_safe(&p, end, len, bad);
313 if (len > 0) {
32852a81 314 ceph_decode_need(&p, end, len, bad);
14303d20 315 err = parse_reply_info_extra(&p, p+len, info, features);
2f2dc053
SW		 316 if (err < 0)
317 goto out_bad;
318 }
319
320 /* snap blob */
321 ceph_decode_32_safe(&p, end, len, bad);
322 info->snapblob_len = len;
323 info->snapblob = p;
324 p += len;
325
326 if (p != end)
327 goto bad;
328 return 0;
329
330bad:
331 err = -EIO;
332out_bad:
333 pr_err("mds parse_reply err %d\n", err);
334 return err;
335}
336
337static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
338{
54008399
YZ		 339 if (!info->dir_in)
340 return;
341 free_pages((unsigned long)info->dir_in, get_order(info->dir_buf_size));
2f2dc053
SW		 342}
343
344
345/*
346 * sessions
347 */
a687ecaf 348const char *ceph_session_state_name(int s)
2f2dc053
SW		 349{
350 switch (s) {
351 case CEPH_MDS_SESSION_NEW: return "new";
352 case CEPH_MDS_SESSION_OPENING: return "opening";
353 case CEPH_MDS_SESSION_OPEN: return "open";
354 case CEPH_MDS_SESSION_HUNG: return "hung";
355 case CEPH_MDS_SESSION_CLOSING: return "closing";
44ca18f2 356 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
2f2dc053
SW		 357 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
358 default: return "???";
359 }
360}
361
362static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
363{
364 if (atomic_inc_not_zero(&s->s_ref)) {
365 dout("mdsc get_session %p %d -> %d\n", s,
366 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
367 return s;
368 } else {
369 dout("mdsc get_session %p 0 -- FAIL", s);
370 return NULL;
371 }
372}
373
374void ceph_put_mds_session(struct ceph_mds_session *s)
375{
376 dout("mdsc put_session %p %d -> %d\n", s,
377 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
4e7a5dcd 378 if (atomic_dec_and_test(&s->s_ref)) {
6c4a1915 379 if (s->s_auth.authorizer)
27859f97
SW		 380 ceph_auth_destroy_authorizer(
381 s->s_mdsc->fsc->client->monc.auth,
382 s->s_auth.authorizer);
2f2dc053 383 kfree(s);
4e7a5dcd 384 }
2f2dc053
SW		 385}
386
387/*
388 * called under mdsc->mutex
389 */
390struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
391 int mds)
392{
393 struct ceph_mds_session *session;
394
395 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
396 return NULL;
397 session = mdsc->sessions[mds];
398 dout("lookup_mds_session %p %d\n", session,
399 atomic_read(&session->s_ref));
400 get_session(session);
401 return session;
402}
403
404static bool __have_session(struct ceph_mds_client *mdsc, int mds)
405{
406 if (mds >= mdsc->max_sessions)
407 return false;
408 return mdsc->sessions[mds];
409}
410
2600d2dd
SW		 411static int __verify_registered_session(struct ceph_mds_client *mdsc,
412 struct ceph_mds_session *s)
413{
414 if (s->s_mds >= mdsc->max_sessions ||
415 mdsc->sessions[s->s_mds] != s)
416 return -ENOENT;
417 return 0;
418}
419
2f2dc053
SW		 420/*
421 * create+register a new session for given mds.
422 * called under mdsc->mutex.
423 */
424static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
425 int mds)
426{
427 struct ceph_mds_session *s;
428
c338c07c
NY		 429 if (mds >= mdsc->mdsmap->m_max_mds)
430 return ERR_PTR(-EINVAL);
431
2f2dc053 432 s = kzalloc(sizeof(*s), GFP_NOFS);
4736b009
DC		 433 if (!s)
434 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 435 s->s_mdsc = mdsc;
436 s->s_mds = mds;
437 s->s_state = CEPH_MDS_SESSION_NEW;
438 s->s_ttl = 0;
439 s->s_seq = 0;
440 mutex_init(&s->s_mutex);
441
b7a9e5dd 442 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
2f2dc053 443
d8fb02ab 444 spin_lock_init(&s->s_gen_ttl_lock);
2f2dc053 445 s->s_cap_gen = 0;
1ce208a6 446 s->s_cap_ttl = jiffies - 1;
d8fb02ab
AE		 447
448 spin_lock_init(&s->s_cap_lock);
2f2dc053
SW		 449 s->s_renew_requested = 0;
450 s->s_renew_seq = 0;
451 INIT_LIST_HEAD(&s->s_caps);
452 s->s_nr_caps = 0;
5dacf091 453 s->s_trim_caps = 0;
2f2dc053
SW		 454 atomic_set(&s->s_ref, 1);
455 INIT_LIST_HEAD(&s->s_waiting);
456 INIT_LIST_HEAD(&s->s_unsafe);
457 s->s_num_cap_releases = 0;
99a9c273 458 s->s_cap_reconnect = 0;
7c1332b8 459 s->s_cap_iterator = NULL;
2f2dc053
SW		 460 INIT_LIST_HEAD(&s->s_cap_releases);
461 INIT_LIST_HEAD(&s->s_cap_releases_done);
462 INIT_LIST_HEAD(&s->s_cap_flushing);
463 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
464
465 dout("register_session mds%d\n", mds);
466 if (mds >= mdsc->max_sessions) {
467 int newmax = 1 << get_count_order(mds+1);
468 struct ceph_mds_session **sa;
469
470 dout("register_session realloc to %d\n", newmax);
471 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
472 if (sa == NULL)
42ce56e5 473 goto fail_realloc;
2f2dc053
SW		 474 if (mdsc->sessions) {
475 memcpy(sa, mdsc->sessions,
476 mdsc->max_sessions * sizeof(void *));
477 kfree(mdsc->sessions);
478 }
479 mdsc->sessions = sa;
480 mdsc->max_sessions = newmax;
481 }
482 mdsc->sessions[mds] = s;
86d8f67b 483 atomic_inc(&mdsc->num_sessions);
2f2dc053 484 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
42ce56e5 485
b7a9e5dd
SW		 486 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
487 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
42ce56e5 488
2f2dc053 489 return s;
42ce56e5
SW		 490
491fail_realloc:
492 kfree(s);
493 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 494}
495
496/*
497 * called under mdsc->mutex
498 */
2600d2dd 499static void __unregister_session(struct ceph_mds_client *mdsc,
42ce56e5 500 struct ceph_mds_session *s)
2f2dc053 501{
2600d2dd
SW		 502 dout("__unregister_session mds%d %p\n", s->s_mds, s);
503 BUG_ON(mdsc->sessions[s->s_mds] != s);
42ce56e5
SW		 504 mdsc->sessions[s->s_mds] = NULL;
505 ceph_con_close(&s->s_con);
506 ceph_put_mds_session(s);
86d8f67b 507 atomic_dec(&mdsc->num_sessions);
2f2dc053
SW		 508}
509
510/*
511 * drop session refs in request.
512 *
513 * should be last request ref, or hold mdsc->mutex
514 */
515static void put_request_session(struct ceph_mds_request *req)
516{
517 if (req->r_session) {
518 ceph_put_mds_session(req->r_session);
519 req->r_session = NULL;
520 }
521}
522
153c8e6b 523void ceph_mdsc_release_request(struct kref *kref)
2f2dc053 524{
153c8e6b
SW		 525 struct ceph_mds_request *req = container_of(kref,
526 struct ceph_mds_request,
527 r_kref);
54008399 528 destroy_reply_info(&req->r_reply_info);
153c8e6b
SW		 529 if (req->r_request)
530 ceph_msg_put(req->r_request);
54008399 531 if (req->r_reply)
153c8e6b 532 ceph_msg_put(req->r_reply);
153c8e6b 533 if (req->r_inode) {
41b02e1f 534 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
153c8e6b
SW		 535 iput(req->r_inode);
536 }
537 if (req->r_locked_dir)
41b02e1f 538 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
e96a650a 539 iput(req->r_target_inode);
153c8e6b
SW		 540 if (req->r_dentry)
541 dput(req->r_dentry);
844d87c3
SW		 542 if (req->r_old_dentry)
543 dput(req->r_old_dentry);
544 if (req->r_old_dentry_dir) {
41b02e1f
SW		 545 /*
546 * track (and drop pins for) r_old_dentry_dir
547 * separately, since r_old_dentry's d_parent may have
548 * changed between the dir mutex being dropped and
549 * this request being freed.
550 */
551 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
552 CEPH_CAP_PIN);
41b02e1f 553 iput(req->r_old_dentry_dir);
2f2dc053 554 }
153c8e6b
SW		 555 kfree(req->r_path1);
556 kfree(req->r_path2);
25e6bae3
YZ		 557 if (req->r_pagelist)
558 ceph_pagelist_release(req->r_pagelist);
153c8e6b 559 put_request_session(req);
37151668 560 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
153c8e6b 561 kfree(req);
2f2dc053
SW		 562}
563
564/*
565 * lookup session, bump ref if found.
566 *
567 * called under mdsc->mutex.
568 */
569static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
570 u64 tid)
571{
572 struct ceph_mds_request *req;
44ca18f2
SW		 573 struct rb_node *n = mdsc->request_tree.rb_node;
574
575 while (n) {
576 req = rb_entry(n, struct ceph_mds_request, r_node);
577 if (tid < req->r_tid)
578 n = n->rb_left;
579 else if (tid > req->r_tid)
580 n = n->rb_right;
581 else {
582 ceph_mdsc_get_request(req);
583 return req;
584 }
585 }
586 return NULL;
587}
588
589static void __insert_request(struct ceph_mds_client *mdsc,
590 struct ceph_mds_request *new)
591{
592 struct rb_node **p = &mdsc->request_tree.rb_node;
593 struct rb_node *parent = NULL;
594 struct ceph_mds_request *req = NULL;
595
596 while (*p) {
597 parent = *p;
598 req = rb_entry(parent, struct ceph_mds_request, r_node);
599 if (new->r_tid < req->r_tid)
600 p = &(*p)->rb_left;
601 else if (new->r_tid > req->r_tid)
602 p = &(*p)->rb_right;
603 else
604 BUG();
605 }
606
607 rb_link_node(&new->r_node, parent, p);
608 rb_insert_color(&new->r_node, &mdsc->request_tree);
2f2dc053
SW		 609}
610
611/*
612 * Register an in-flight request, and assign a tid. Link to directory
613 * are modifying (if any).
614 *
615 * Called under mdsc->mutex.
616 */
617static void __register_request(struct ceph_mds_client *mdsc,
618 struct ceph_mds_request *req,
619 struct inode *dir)
620{
621 req->r_tid = ++mdsc->last_tid;
622 if (req->r_num_caps)
37151668
YS		 623 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
624 req->r_num_caps);
2f2dc053
SW		 625 dout("__register_request %p tid %lld\n", req, req->r_tid);
626 ceph_mdsc_get_request(req);
44ca18f2 627 __insert_request(mdsc, req);
2f2dc053 628
cb4276cc
SW		 629 req->r_uid = current_fsuid();
630 req->r_gid = current_fsgid();
631
2f2dc053
SW		 632 if (dir) {
633 struct ceph_inode_info *ci = ceph_inode(dir);
634
3b663780 635 ihold(dir);
2f2dc053
SW		 636 spin_lock(&ci->i_unsafe_lock);
637 req->r_unsafe_dir = dir;
638 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
639 spin_unlock(&ci->i_unsafe_lock);
640 }
641}
642
643static void __unregister_request(struct ceph_mds_client *mdsc,
644 struct ceph_mds_request *req)
645{
646 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
44ca18f2 647 rb_erase(&req->r_node, &mdsc->request_tree);
80fc7314 648 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 649
650 if (req->r_unsafe_dir) {
651 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
652
653 spin_lock(&ci->i_unsafe_lock);
654 list_del_init(&req->r_unsafe_dir_item);
655 spin_unlock(&ci->i_unsafe_lock);
3b663780
SW		 656
657 iput(req->r_unsafe_dir);
658 req->r_unsafe_dir = NULL;
2f2dc053 659 }
94aa8ae1 660
fc55d2c9
YZ		 661 complete_all(&req->r_safe_completion);
662
94aa8ae1 663 ceph_mdsc_put_request(req);
2f2dc053
SW		 664}
665
666/*
667 * Choose mds to send request to next. If there is a hint set in the
668 * request (e.g., due to a prior forward hint from the mds), use that.
669 * Otherwise, consult frag tree and/or caps to identify the
670 * appropriate mds. If all else fails, choose randomly.
671 *
672 * Called under mdsc->mutex.
673 */
7fd7d101 674static struct dentry *get_nonsnap_parent(struct dentry *dentry)
eb6bb1c5 675{
d79698da
SW		 676 /*
677 * we don't need to worry about protecting the d_parent access
678 * here because we never renaming inside the snapped namespace
679 * except to resplice to another snapdir, and either the old or new
680 * result is a valid result.
681 */
eb6bb1c5
SW		 682 while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
683 dentry = dentry->d_parent;
684 return dentry;
685}
686
2f2dc053
SW		 687static int __choose_mds(struct ceph_mds_client *mdsc,
688 struct ceph_mds_request *req)
689{
690 struct inode *inode;
691 struct ceph_inode_info *ci;
692 struct ceph_cap *cap;
693 int mode = req->r_direct_mode;
694 int mds = -1;
695 u32 hash = req->r_direct_hash;
696 bool is_hash = req->r_direct_is_hash;
697
698 /*
699 * is there a specific mds we should try? ignore hint if we have
700 * no session and the mds is not up (active or recovering).
701 */
702 if (req->r_resend_mds >= 0 &&
703 (__have_session(mdsc, req->r_resend_mds) ||
704 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
705 dout("choose_mds using resend_mds mds%d\n",
706 req->r_resend_mds);
707 return req->r_resend_mds;
708 }
709
710 if (mode == USE_RANDOM_MDS)
711 goto random;
712
713 inode = NULL;
714 if (req->r_inode) {
715 inode = req->r_inode;
716 } else if (req->r_dentry) {
d79698da
SW		 717 /* ignore race with rename; old or new d_parent is okay */
718 struct dentry *parent = req->r_dentry->d_parent;
719 struct inode *dir = parent->d_inode;
eb6bb1c5 720
3d14c5d2 721 if (dir->i_sb != mdsc->fsc->sb) {
eb6bb1c5
SW		 722 /* not this fs! */
723 inode = req->r_dentry->d_inode;
724 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
725 /* direct snapped/virtual snapdir requests
726 * based on parent dir inode */
d79698da 727 struct dentry *dn = get_nonsnap_parent(parent);
eb6bb1c5
SW		 728 inode = dn->d_inode;
729 dout("__choose_mds using nonsnap parent %p\n", inode);
ca18bede 730 } else {
eb6bb1c5 731 /* dentry target */
2f2dc053 732 inode = req->r_dentry->d_inode;
ca18bede
YZ		 733 if (!inode || mode == USE_AUTH_MDS) {
734 /* dir + name */
735 inode = dir;
736 hash = ceph_dentry_hash(dir, req->r_dentry);
737 is_hash = true;
738 }
2f2dc053
SW		 739 }
740 }
eb6bb1c5 741
2f2dc053
SW		 742 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
743 (int)hash, mode);
744 if (!inode)
745 goto random;
746 ci = ceph_inode(inode);
747
748 if (is_hash && S_ISDIR(inode->i_mode)) {
749 struct ceph_inode_frag frag;
750 int found;
751
752 ceph_choose_frag(ci, hash, &frag, &found);
753 if (found) {
754 if (mode == USE_ANY_MDS && frag.ndist > 0) {
755 u8 r;
756
757 /* choose a random replica */
758 get_random_bytes(&r, 1);
759 r %= frag.ndist;
760 mds = frag.dist[r];
761 dout("choose_mds %p %llx.%llx "
762 "frag %u mds%d (%d/%d)\n",
763 inode, ceph_vinop(inode),
d66bbd44 764 frag.frag, mds,
2f2dc053 765 (int)r, frag.ndist);
d66bbd44
SW		 766 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
767 CEPH_MDS_STATE_ACTIVE)
768 return mds;
2f2dc053
SW		 769 }
770
771 /* since this file/dir wasn't known to be
772 * replicated, then we want to look for the
773 * authoritative mds. */
774 mode = USE_AUTH_MDS;
775 if (frag.mds >= 0) {
776 /* choose auth mds */
777 mds = frag.mds;
778 dout("choose_mds %p %llx.%llx "
779 "frag %u mds%d (auth)\n",
780 inode, ceph_vinop(inode), frag.frag, mds);
d66bbd44
SW		 781 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
782 CEPH_MDS_STATE_ACTIVE)
783 return mds;
2f2dc053
SW		 784 }
785 }
786 }
787
be655596 788 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 789 cap = NULL;
790 if (mode == USE_AUTH_MDS)
791 cap = ci->i_auth_cap;
792 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
793 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
794 if (!cap) {
be655596 795 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 796 goto random;
797 }
798 mds = cap->session->s_mds;
799 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
800 inode, ceph_vinop(inode), mds,
801 cap == ci->i_auth_cap ? "auth " : "", cap);
be655596 802 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 803 return mds;
804
805random:
806 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
807 dout("choose_mds chose random mds%d\n", mds);
808 return mds;
809}
810
811
812/*
813 * session messages
814 */
815static struct ceph_msg *create_session_msg(u32 op, u64 seq)
816{
817 struct ceph_msg *msg;
818 struct ceph_mds_session_head *h;
819
b61c2763
SW		 820 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
821 false);
a79832f2 822 if (!msg) {
2f2dc053 823 pr_err("create_session_msg ENOMEM creating msg\n");
a79832f2 824 return NULL;
2f2dc053
SW		 825 }
826 h = msg->front.iov_base;
827 h->op = cpu_to_le32(op);
828 h->seq = cpu_to_le64(seq);
dbd0c8bf
JS		 829
830 return msg;
831}
832
833/*
834 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
835 * to include additional client metadata fields.
836 */
837static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
838{
839 struct ceph_msg *msg;
840 struct ceph_mds_session_head *h;
841 int i = -1;
842 int metadata_bytes = 0;
843 int metadata_key_count = 0;
844 struct ceph_options *opt = mdsc->fsc->client->options;
845 void *p;
846
a6a5ce4f 847 const char* metadata[][2] = {
dbd0c8bf 848 {"hostname", utsname()->nodename},
a6a5ce4f 849 {"kernel_version", utsname()->release},
dbd0c8bf
JS		 850 {"entity_id", opt->name ? opt->name : ""},
851 {NULL, NULL}
852 };
853
854 /* Calculate serialized length of metadata */
855 metadata_bytes = 4; /* map length */
856 for (i = 0; metadata[i][0] != NULL; ++i) {
857 metadata_bytes += 8 + strlen(metadata[i][0]) +
858 strlen(metadata[i][1]);
859 metadata_key_count++;
860 }
861
862 /* Allocate the message */
863 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
864 GFP_NOFS, false);
865 if (!msg) {
866 pr_err("create_session_msg ENOMEM creating msg\n");
867 return NULL;
868 }
869 h = msg->front.iov_base;
870 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
871 h->seq = cpu_to_le64(seq);
872
873 /*
874 * Serialize client metadata into waiting buffer space, using
875 * the format that userspace expects for map<string, string>
7cfa0313
JS		 876 *
877 * ClientSession messages with metadata are v2
dbd0c8bf 878 */
7cfa0313
JS		 879 msg->hdr.version = cpu_to_le16(2);
880 msg->hdr.compat_version = cpu_to_le16(1);
dbd0c8bf
JS		 881
882 /* The write pointer, following the session_head structure */
883 p = msg->front.iov_base + sizeof(*h);
884
885 /* Number of entries in the map */
886 ceph_encode_32(&p, metadata_key_count);
887
888 /* Two length-prefixed strings for each entry in the map */
889 for (i = 0; metadata[i][0] != NULL; ++i) {
890 size_t const key_len = strlen(metadata[i][0]);
891 size_t const val_len = strlen(metadata[i][1]);
892
893 ceph_encode_32(&p, key_len);
894 memcpy(p, metadata[i][0], key_len);
895 p += key_len;
896 ceph_encode_32(&p, val_len);
897 memcpy(p, metadata[i][1], val_len);
898 p += val_len;
899 }
900
2f2dc053
SW		 901 return msg;
902}
903
904/*
905 * send session open request.
906 *
907 * called under mdsc->mutex
908 */
909static int __open_session(struct ceph_mds_client *mdsc,
910 struct ceph_mds_session *session)
911{
912 struct ceph_msg *msg;
913 int mstate;
914 int mds = session->s_mds;
2f2dc053
SW		 915
916 /* wait for mds to go active? */
917 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
918 dout("open_session to mds%d (%s)\n", mds,
919 ceph_mds_state_name(mstate));
920 session->s_state = CEPH_MDS_SESSION_OPENING;
921 session->s_renew_requested = jiffies;
922
923 /* send connect message */
dbd0c8bf 924 msg = create_session_open_msg(mdsc, session->s_seq);
a79832f2
SW		 925 if (!msg)
926 return -ENOMEM;
2f2dc053 927 ceph_con_send(&session->s_con, msg);
2f2dc053
SW		 928 return 0;
929}
930
ed0552a1
SW		 931/*
932 * open sessions for any export targets for the given mds
933 *
934 * called under mdsc->mutex
935 */
5d72d13c
YZ		 936static struct ceph_mds_session *
937__open_export_target_session(struct ceph_mds_client *mdsc, int target)
938{
939 struct ceph_mds_session *session;
940
941 session = __ceph_lookup_mds_session(mdsc, target);
942 if (!session) {
943 session = register_session(mdsc, target);
944 if (IS_ERR(session))
945 return session;
946 }
947 if (session->s_state == CEPH_MDS_SESSION_NEW ||
948 session->s_state == CEPH_MDS_SESSION_CLOSING)
949 __open_session(mdsc, session);
950
951 return session;
952}
953
954struct ceph_mds_session *
955ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
956{
957 struct ceph_mds_session *session;
958
959 dout("open_export_target_session to mds%d\n", target);
960
961 mutex_lock(&mdsc->mutex);
962 session = __open_export_target_session(mdsc, target);
963 mutex_unlock(&mdsc->mutex);
964
965 return session;
966}
967
ed0552a1
SW		 968static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
969 struct ceph_mds_session *session)
970{
971 struct ceph_mds_info *mi;
972 struct ceph_mds_session *ts;
973 int i, mds = session->s_mds;
ed0552a1
SW		 974
975 if (mds >= mdsc->mdsmap->m_max_mds)
976 return;
5d72d13c 977
ed0552a1
SW		 978 mi = &mdsc->mdsmap->m_info[mds];
979 dout("open_export_target_sessions for mds%d (%d targets)\n",
980 session->s_mds, mi->num_export_targets);
981
982 for (i = 0; i < mi->num_export_targets; i++) {
5d72d13c
YZ		 983 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
984 if (!IS_ERR(ts))
985 ceph_put_mds_session(ts);
ed0552a1
SW		 986 }
987}
988
154f42c2
SW		 989void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
990 struct ceph_mds_session *session)
991{
992 mutex_lock(&mdsc->mutex);
993 __open_export_target_sessions(mdsc, session);
994 mutex_unlock(&mdsc->mutex);
995}
996
2f2dc053
SW		 997/*
998 * session caps
999 */
1000
1001/*
1002 * Free preallocated cap messages assigned to this session
1003 */
1004static void cleanup_cap_releases(struct ceph_mds_session *session)
1005{
1006 struct ceph_msg *msg;
1007
1008 spin_lock(&session->s_cap_lock);
1009 while (!list_empty(&session->s_cap_releases)) {
1010 msg = list_first_entry(&session->s_cap_releases,
1011 struct ceph_msg, list_head);
1012 list_del_init(&msg->list_head);
1013 ceph_msg_put(msg);
1014 }
1015 while (!list_empty(&session->s_cap_releases_done)) {
1016 msg = list_first_entry(&session->s_cap_releases_done,
1017 struct ceph_msg, list_head);
1018 list_del_init(&msg->list_head);
1019 ceph_msg_put(msg);
1020 }
1021 spin_unlock(&session->s_cap_lock);
1022}
1023
1024/*
f818a736
SW		 1025 * Helper to safely iterate over all caps associated with a session, with
1026 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 1027 *
f818a736 1028 * Caller must hold session s_mutex.
2f2dc053
SW		 1029 */
1030static int iterate_session_caps(struct ceph_mds_session *session,
1031 int (*cb)(struct inode *, struct ceph_cap *,
1032 void *), void *arg)
1033{
7c1332b8
SW		 1034 struct list_head *p;
1035 struct ceph_cap *cap;
1036 struct inode *inode, *last_inode = NULL;
1037 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 1038 int ret;
1039
1040 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1041 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1042 p = session->s_caps.next;
1043 while (p != &session->s_caps) {
1044 cap = list_entry(p, struct ceph_cap, session_caps);
2f2dc053 1045 inode = igrab(&cap->ci->vfs_inode);
7c1332b8
SW		 1046 if (!inode) {
1047 p = p->next;
2f2dc053 1048 continue;
7c1332b8
SW		 1049 }
1050 session->s_cap_iterator = cap;
2f2dc053 1051 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 1052
1053 if (last_inode) {
1054 iput(last_inode);
1055 last_inode = NULL;
1056 }
1057 if (old_cap) {
37151668 1058 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 1059 old_cap = NULL;
1060 }
1061
2f2dc053 1062 ret = cb(inode, cap, arg);
7c1332b8
SW		 1063 last_inode = inode;
1064
2f2dc053 1065 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1066 p = p->next;
1067 if (cap->ci == NULL) {
1068 dout("iterate_session_caps finishing cap %p removal\n",
1069 cap);
1070 BUG_ON(cap->session != session);
1071 list_del_init(&cap->session_caps);
1072 session->s_nr_caps--;
1073 cap->session = NULL;
1074 old_cap = cap; /* put_cap it w/o locks held */
1075 }
5dacf091
SW		 1076 if (ret < 0)
1077 goto out;
2f2dc053 1078 }
5dacf091
SW		 1079 ret = 0;
1080out:
7c1332b8 1081 session->s_cap_iterator = NULL;
2f2dc053 1082 spin_unlock(&session->s_cap_lock);
7c1332b8 1083
e96a650a 1084 iput(last_inode);
7c1332b8 1085 if (old_cap)
37151668 1086 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1087
5dacf091 1088 return ret;
2f2dc053
SW		 1089}
1090
1091static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
6c99f254 1092 void *arg)
2f2dc053
SW		 1093{
1094 struct ceph_inode_info *ci = ceph_inode(inode);
6c99f254
SW		 1095 int drop = 0;
1096
2f2dc053
SW		 1097 dout("removing cap %p, ci is %p, inode is %p\n",
1098 cap, ci, &ci->vfs_inode);
be655596 1099 spin_lock(&ci->i_ceph_lock);
a096b09a 1100 __ceph_remove_cap(cap, false);
6c99f254
SW		 1101 if (!__ceph_is_any_real_caps(ci)) {
1102 struct ceph_mds_client *mdsc =
3d14c5d2 1103 ceph_sb_to_client(inode->i_sb)->mdsc;
6c99f254
SW		 1104
1105 spin_lock(&mdsc->cap_dirty_lock);
1106 if (!list_empty(&ci->i_dirty_item)) {
1107 pr_info(" dropping dirty %s state for %p %lld\n",
1108 ceph_cap_string(ci->i_dirty_caps),
1109 inode, ceph_ino(inode));
1110 ci->i_dirty_caps = 0;
1111 list_del_init(&ci->i_dirty_item);
1112 drop = 1;
1113 }
1114 if (!list_empty(&ci->i_flushing_item)) {
1115 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
1116 ceph_cap_string(ci->i_flushing_caps),
1117 inode, ceph_ino(inode));
1118 ci->i_flushing_caps = 0;
1119 list_del_init(&ci->i_flushing_item);
1120 mdsc->num_cap_flushing--;
1121 drop = 1;
1122 }
1123 if (drop && ci->i_wrbuffer_ref) {
1124 pr_info(" dropping dirty data for %p %lld\n",
1125 inode, ceph_ino(inode));
1126 ci->i_wrbuffer_ref = 0;
1127 ci->i_wrbuffer_ref_head = 0;
1128 drop++;
1129 }
1130 spin_unlock(&mdsc->cap_dirty_lock);
1131 }
be655596 1132 spin_unlock(&ci->i_ceph_lock);
6c99f254
SW		 1133 while (drop--)
1134 iput(inode);
2f2dc053
SW		 1135 return 0;
1136}
1137
1138/*
1139 * caller must hold session s_mutex
1140 */
1141static void remove_session_caps(struct ceph_mds_session *session)
1142{
1143 dout("remove_session_caps on %p\n", session);
1144 iterate_session_caps(session, remove_session_caps_cb, NULL);
6f60f889
YZ		 1145
1146 spin_lock(&session->s_cap_lock);
1147 if (session->s_nr_caps > 0) {
1148 struct super_block *sb = session->s_mdsc->fsc->sb;
1149 struct inode *inode;
1150 struct ceph_cap *cap, *prev = NULL;
1151 struct ceph_vino vino;
1152 /*
1153 * iterate_session_caps() skips inodes that are being
1154 * deleted, we need to wait until deletions are complete.
1155 * __wait_on_freeing_inode() is designed for the job,
1156 * but it is not exported, so use lookup inode function
1157 * to access it.
1158 */
1159 while (!list_empty(&session->s_caps)) {
1160 cap = list_entry(session->s_caps.next,
1161 struct ceph_cap, session_caps);
1162 if (cap == prev)
1163 break;
1164 prev = cap;
1165 vino = cap->ci->i_vino;
1166 spin_unlock(&session->s_cap_lock);
1167
ed284c49 1168 inode = ceph_find_inode(sb, vino);
6f60f889
YZ		 1169 iput(inode);
1170
1171 spin_lock(&session->s_cap_lock);
1172 }
1173 }
1174 spin_unlock(&session->s_cap_lock);
1175
2f2dc053 1176 BUG_ON(session->s_nr_caps > 0);
6c99f254 1177 BUG_ON(!list_empty(&session->s_cap_flushing));
2f2dc053
SW		 1178 cleanup_cap_releases(session);
1179}
1180
1181/*
1182 * wake up any threads waiting on this session's caps. if the cap is
1183 * old (didn't get renewed on the client reconnect), remove it now.
1184 *
1185 * caller must hold s_mutex.
1186 */
1187static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1188 void *arg)
1189{
0dc2570f
SW		 1190 struct ceph_inode_info *ci = ceph_inode(inode);
1191
03066f23 1192 wake_up_all(&ci->i_cap_wq);
0dc2570f 1193 if (arg) {
be655596 1194 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1195 ci->i_wanted_max_size = 0;
1196 ci->i_requested_max_size = 0;
be655596 1197 spin_unlock(&ci->i_ceph_lock);
0dc2570f 1198 }
2f2dc053
SW		 1199 return 0;
1200}
1201
0dc2570f
SW		 1202static void wake_up_session_caps(struct ceph_mds_session *session,
1203 int reconnect)
2f2dc053
SW		 1204{
1205 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
0dc2570f
SW		 1206 iterate_session_caps(session, wake_up_session_cb,
1207 (void *)(unsigned long)reconnect);
2f2dc053
SW		 1208}
1209
1210/*
1211 * Send periodic message to MDS renewing all currently held caps. The
1212 * ack will reset the expiration for all caps from this session.
1213 *
1214 * caller holds s_mutex
1215 */
1216static int send_renew_caps(struct ceph_mds_client *mdsc,
1217 struct ceph_mds_session *session)
1218{
1219 struct ceph_msg *msg;
1220 int state;
1221
1222 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1223 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1224 pr_info("mds%d caps stale\n", session->s_mds);
e4cb4cb8 1225 session->s_renew_requested = jiffies;
2f2dc053
SW		 1226
1227 /* do not try to renew caps until a recovering mds has reconnected
1228 * with its clients. */
1229 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1230 if (state < CEPH_MDS_STATE_RECONNECT) {
1231 dout("send_renew_caps ignoring mds%d (%s)\n",
1232 session->s_mds, ceph_mds_state_name(state));
1233 return 0;
1234 }
1235
1236 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1237 ceph_mds_state_name(state));
2f2dc053
SW		 1238 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1239 ++session->s_renew_seq);
a79832f2
SW		 1240 if (!msg)
1241 return -ENOMEM;
2f2dc053
SW		 1242 ceph_con_send(&session->s_con, msg);
1243 return 0;
1244}
1245
186e4f7a
YZ		 1246static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1247 struct ceph_mds_session *session, u64 seq)
1248{
1249 struct ceph_msg *msg;
1250
1251 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
a687ecaf 1252 session->s_mds, ceph_session_state_name(session->s_state), seq);
186e4f7a
YZ		 1253 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1254 if (!msg)
1255 return -ENOMEM;
1256 ceph_con_send(&session->s_con, msg);
1257 return 0;
1258}
1259
1260
2f2dc053
SW		 1261/*
1262 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 1263 *
1264 * Called under session->s_mutex
2f2dc053
SW		 1265 */
1266static void renewed_caps(struct ceph_mds_client *mdsc,
1267 struct ceph_mds_session *session, int is_renew)
1268{
1269 int was_stale;
1270 int wake = 0;
1271
1272 spin_lock(&session->s_cap_lock);
1ce208a6 1273 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 1274
1275 session->s_cap_ttl = session->s_renew_requested +
1276 mdsc->mdsmap->m_session_timeout*HZ;
1277
1278 if (was_stale) {
1279 if (time_before(jiffies, session->s_cap_ttl)) {
1280 pr_info("mds%d caps renewed\n", session->s_mds);
1281 wake = 1;
1282 } else {
1283 pr_info("mds%d caps still stale\n", session->s_mds);
1284 }
1285 }
1286 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1287 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1288 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1289 spin_unlock(&session->s_cap_lock);
1290
1291 if (wake)
0dc2570f 1292 wake_up_session_caps(session, 0);
2f2dc053
SW		 1293}
1294
1295/*
1296 * send a session close request
1297 */
1298static int request_close_session(struct ceph_mds_client *mdsc,
1299 struct ceph_mds_session *session)
1300{
1301 struct ceph_msg *msg;
2f2dc053
SW		 1302
1303 dout("request_close_session mds%d state %s seq %lld\n",
a687ecaf 1304 session->s_mds, ceph_session_state_name(session->s_state),
2f2dc053
SW		 1305 session->s_seq);
1306 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
a79832f2
SW		 1307 if (!msg)
1308 return -ENOMEM;
1309 ceph_con_send(&session->s_con, msg);
1310 return 0;
2f2dc053
SW		 1311}
1312
1313/*
1314 * Called with s_mutex held.
1315 */
1316static int __close_session(struct ceph_mds_client *mdsc,
1317 struct ceph_mds_session *session)
1318{
1319 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1320 return 0;
1321 session->s_state = CEPH_MDS_SESSION_CLOSING;
1322 return request_close_session(mdsc, session);
1323}
1324
1325/*
1326 * Trim old(er) caps.
1327 *
1328 * Because we can't cache an inode without one or more caps, we do
1329 * this indirectly: if a cap is unused, we prune its aliases, at which
1330 * point the inode will hopefully get dropped to.
1331 *
1332 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1333 * memory pressure from the MDS, though, so it needn't be perfect.
1334 */
1335static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1336{
1337 struct ceph_mds_session *session = arg;
1338 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 1339 int used, wanted, oissued, mine;
2f2dc053
SW		 1340
1341 if (session->s_trim_caps <= 0)
1342 return -1;
1343
be655596 1344 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1345 mine = cap->issued | cap->implemented;
1346 used = __ceph_caps_used(ci);
979abfdd 1347 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 1348 oissued = __ceph_caps_issued_other(ci, cap);
1349
979abfdd 1350 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
2f2dc053 1351 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
979abfdd
YZ		 1352 ceph_cap_string(used), ceph_cap_string(wanted));
1353 if (cap == ci->i_auth_cap) {
1354 if (ci->i_dirty_caps | ci->i_flushing_caps)
1355 goto out;
1356 if ((used | wanted) & CEPH_CAP_ANY_WR)
1357 goto out;
1358 }
1359 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 1360 goto out; /* we need these caps */
1361
1362 session->s_trim_caps--;
1363 if (oissued) {
1364 /* we aren't the only cap.. just remove us */
a096b09a 1365 __ceph_remove_cap(cap, true);
2f2dc053
SW		 1366 } else {
1367 /* try to drop referring dentries */
be655596 1368 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1369 d_prune_aliases(inode);
1370 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1371 inode, cap, atomic_read(&inode->i_count));
1372 return 0;
1373 }
1374
1375out:
be655596 1376 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1377 return 0;
1378}
1379
1380/*
1381 * Trim session cap count down to some max number.
1382 */
1383static int trim_caps(struct ceph_mds_client *mdsc,
1384 struct ceph_mds_session *session,
1385 int max_caps)
1386{
1387 int trim_caps = session->s_nr_caps - max_caps;
1388
1389 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1390 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1391 if (trim_caps > 0) {
1392 session->s_trim_caps = trim_caps;
1393 iterate_session_caps(session, trim_caps_cb, session);
1394 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1395 session->s_mds, session->s_nr_caps, max_caps,
1396 trim_caps - session->s_trim_caps);
5dacf091 1397 session->s_trim_caps = 0;
2f2dc053 1398 }
a56371d9
YZ		 1399
1400 ceph_add_cap_releases(mdsc, session);
1401 ceph_send_cap_releases(mdsc, session);
2f2dc053
SW		 1402 return 0;
1403}
1404
1405/*
1406 * Allocate cap_release messages. If there is a partially full message
1407 * in the queue, try to allocate enough to cover it's remainder, so that
1408 * we can send it immediately.
1409 *
1410 * Called under s_mutex.
1411 */
2b2300d6 1412int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
ee6b272b 1413 struct ceph_mds_session *session)
2f2dc053 1414{
38e8883e 1415 struct ceph_msg *msg, *partial = NULL;
2f2dc053
SW		 1416 struct ceph_mds_cap_release *head;
1417 int err = -ENOMEM;
3d14c5d2 1418 int extra = mdsc->fsc->mount_options->cap_release_safety;
38e8883e 1419 int num;
2f2dc053 1420
38e8883e
SW		 1421 dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
1422 extra);
2f2dc053
SW		 1423
1424 spin_lock(&session->s_cap_lock);
1425
1426 if (!list_empty(&session->s_cap_releases)) {
1427 msg = list_first_entry(&session->s_cap_releases,
1428 struct ceph_msg,
1429 list_head);
1430 head = msg->front.iov_base;
38e8883e
SW		 1431 num = le32_to_cpu(head->num);
1432 if (num) {
1433 dout(" partial %p with (%d/%d)\n", msg, num,
1434 (int)CEPH_CAPS_PER_RELEASE);
1435 extra += CEPH_CAPS_PER_RELEASE - num;
1436 partial = msg;
1437 }
2f2dc053 1438 }
2f2dc053
SW		 1439 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1440 spin_unlock(&session->s_cap_lock);
34d23762 1441 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
b61c2763 1442 GFP_NOFS, false);
2f2dc053
SW		 1443 if (!msg)
1444 goto out_unlocked;
1445 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1446 (int)msg->front.iov_len);
1447 head = msg->front.iov_base;
1448 head->num = cpu_to_le32(0);
1449 msg->front.iov_len = sizeof(*head);
1450 spin_lock(&session->s_cap_lock);
1451 list_add(&msg->list_head, &session->s_cap_releases);
1452 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1453 }
1454
38e8883e
SW		 1455 if (partial) {
1456 head = partial->front.iov_base;
1457 num = le32_to_cpu(head->num);
1458 dout(" queueing partial %p with %d/%d\n", partial, num,
1459 (int)CEPH_CAPS_PER_RELEASE);
1460 list_move_tail(&partial->list_head,
1461 &session->s_cap_releases_done);
1462 session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
2f2dc053
SW		 1463 }
1464 err = 0;
1465 spin_unlock(&session->s_cap_lock);
1466out_unlocked:
1467 return err;
1468}
1469
d3383a8e
YZ		 1470static int check_cap_flush(struct inode *inode, u64 want_flush_seq)
1471{
1472 struct ceph_inode_info *ci = ceph_inode(inode);
1473 int ret;
1474 spin_lock(&ci->i_ceph_lock);
1475 if (ci->i_flushing_caps)
1476 ret = ci->i_cap_flush_seq >= want_flush_seq;
1477 else
1478 ret = 1;
1479 spin_unlock(&ci->i_ceph_lock);
1480 return ret;
1481}
1482
2f2dc053
SW		 1483/*
1484 * flush all dirty inode data to disk.
1485 *
1486 * returns true if we've flushed through want_flush_seq
1487 */
d3383a8e 1488static void wait_caps_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
2f2dc053 1489{
d3383a8e 1490 int mds;
2f2dc053
SW		 1491
1492 dout("check_cap_flush want %lld\n", want_flush_seq);
1493 mutex_lock(&mdsc->mutex);
d3383a8e 1494 for (mds = 0; mds < mdsc->max_sessions; mds++) {
2f2dc053 1495 struct ceph_mds_session *session = mdsc->sessions[mds];
d3383a8e 1496 struct inode *inode = NULL;
2f2dc053
SW		 1497
1498 if (!session)
1499 continue;
1500 get_session(session);
1501 mutex_unlock(&mdsc->mutex);
1502
1503 mutex_lock(&session->s_mutex);
1504 if (!list_empty(&session->s_cap_flushing)) {
1505 struct ceph_inode_info *ci =
1506 list_entry(session->s_cap_flushing.next,
1507 struct ceph_inode_info,
1508 i_flushing_item);
2f2dc053 1509
d3383a8e 1510 if (!check_cap_flush(&ci->vfs_inode, want_flush_seq)) {
2f2dc053 1511 dout("check_cap_flush still flushing %p "
d3383a8e
YZ		 1512 "seq %lld <= %lld to mds%d\n",
1513 &ci->vfs_inode, ci->i_cap_flush_seq,
1514 want_flush_seq, session->s_mds);
1515 inode = igrab(&ci->vfs_inode);
2f2dc053 1516 }
2f2dc053
SW		 1517 }
1518 mutex_unlock(&session->s_mutex);
1519 ceph_put_mds_session(session);
1520
d3383a8e
YZ		 1521 if (inode) {
1522 wait_event(mdsc->cap_flushing_wq,
1523 check_cap_flush(inode, want_flush_seq));
1524 iput(inode);
1525 }
1526
2f2dc053
SW		 1527 mutex_lock(&mdsc->mutex);
1528 }
1529
1530 mutex_unlock(&mdsc->mutex);
1531 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
2f2dc053
SW		 1532}
1533
1534/*
1535 * called under s_mutex
1536 */
3d7ded4d
SW		 1537void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1538 struct ceph_mds_session *session)
2f2dc053
SW		 1539{
1540 struct ceph_msg *msg;
1541
1542 dout("send_cap_releases mds%d\n", session->s_mds);
0f8605f2
SW		 1543 spin_lock(&session->s_cap_lock);
1544 while (!list_empty(&session->s_cap_releases_done)) {
2f2dc053
SW		 1545 msg = list_first_entry(&session->s_cap_releases_done,
1546 struct ceph_msg, list_head);
1547 list_del_init(&msg->list_head);
1548 spin_unlock(&session->s_cap_lock);
1549 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1550 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1551 ceph_con_send(&session->s_con, msg);
0f8605f2 1552 spin_lock(&session->s_cap_lock);
2f2dc053
SW		 1553 }
1554 spin_unlock(&session->s_cap_lock);
1555}
1556
e01a5946
SW		 1557static void discard_cap_releases(struct ceph_mds_client *mdsc,
1558 struct ceph_mds_session *session)
1559{
1560 struct ceph_msg *msg;
1561 struct ceph_mds_cap_release *head;
1562 unsigned num;
1563
1564 dout("discard_cap_releases mds%d\n", session->s_mds);
e01a5946 1565
00bd8edb
YZ		 1566 if (!list_empty(&session->s_cap_releases)) {
1567 /* zero out the in-progress message */
1568 msg = list_first_entry(&session->s_cap_releases,
1569 struct ceph_msg, list_head);
1570 head = msg->front.iov_base;
1571 num = le32_to_cpu(head->num);
1572 dout("discard_cap_releases mds%d %p %u\n",
1573 session->s_mds, msg, num);
1574 head->num = cpu_to_le32(0);
1575 msg->front.iov_len = sizeof(*head);
1576 session->s_num_cap_releases += num;
1577 }
e01a5946
SW		 1578
1579 /* requeue completed messages */
1580 while (!list_empty(&session->s_cap_releases_done)) {
1581 msg = list_first_entry(&session->s_cap_releases_done,
1582 struct ceph_msg, list_head);
1583 list_del_init(&msg->list_head);
1584
1585 head = msg->front.iov_base;
1586 num = le32_to_cpu(head->num);
1587 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
1588 num);
1589 session->s_num_cap_releases += num;
1590 head->num = cpu_to_le32(0);
1591 msg->front.iov_len = sizeof(*head);
1592 list_add(&msg->list_head, &session->s_cap_releases);
1593 }
e01a5946
SW		 1594}
1595
2f2dc053
SW		 1596/*
1597 * requests
1598 */
1599
54008399
YZ		 1600int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1601 struct inode *dir)
1602{
1603 struct ceph_inode_info *ci = ceph_inode(dir);
1604 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1605 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1606 size_t size = sizeof(*rinfo->dir_in) + sizeof(*rinfo->dir_dname_len) +
1607 sizeof(*rinfo->dir_dname) + sizeof(*rinfo->dir_dlease);
1608 int order, num_entries;
1609
1610 spin_lock(&ci->i_ceph_lock);
1611 num_entries = ci->i_files + ci->i_subdirs;
1612 spin_unlock(&ci->i_ceph_lock);
1613 num_entries = max(num_entries, 1);
1614 num_entries = min(num_entries, opt->max_readdir);
1615
1616 order = get_order(size * num_entries);
1617 while (order >= 0) {
1618 rinfo->dir_in = (void*)__get_free_pages(GFP_NOFS | __GFP_NOWARN,
1619 order);
1620 if (rinfo->dir_in)
1621 break;
1622 order--;
1623 }
1624 if (!rinfo->dir_in)
1625 return -ENOMEM;
1626
1627 num_entries = (PAGE_SIZE << order) / size;
1628 num_entries = min(num_entries, opt->max_readdir);
1629
1630 rinfo->dir_buf_size = PAGE_SIZE << order;
1631 req->r_num_caps = num_entries + 1;
1632 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1633 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1634 return 0;
1635}
1636
2f2dc053
SW		 1637/*
1638 * Create an mds request.
1639 */
1640struct ceph_mds_request *
1641ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1642{
1643 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1644
1645 if (!req)
1646 return ERR_PTR(-ENOMEM);
1647
b4556396 1648 mutex_init(&req->r_fill_mutex);
37151668 1649 req->r_mdsc = mdsc;
2f2dc053
SW		 1650 req->r_started = jiffies;
1651 req->r_resend_mds = -1;
1652 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1653 req->r_fmode = -1;
153c8e6b 1654 kref_init(&req->r_kref);
2f2dc053
SW		 1655 INIT_LIST_HEAD(&req->r_wait);
1656 init_completion(&req->r_completion);
1657 init_completion(&req->r_safe_completion);
1658 INIT_LIST_HEAD(&req->r_unsafe_item);
1659
b8e69066
SW		 1660 req->r_stamp = CURRENT_TIME;
1661
2f2dc053
SW		 1662 req->r_op = op;
1663 req->r_direct_mode = mode;
1664 return req;
1665}
1666
1667/*
44ca18f2 1668 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 1669 *
1670 * called under mdsc->mutex.
1671 */
44ca18f2
SW		 1672static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1673{
1674 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1675 return NULL;
1676 return rb_entry(rb_first(&mdsc->request_tree),
1677 struct ceph_mds_request, r_node);
1678}
1679
2f2dc053
SW		 1680static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1681{
44ca18f2
SW		 1682 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1683
1684 if (req)
1685 return req->r_tid;
1686 return 0;
2f2dc053
SW		 1687}
1688
1689/*
1690 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1691 * on build_path_from_dentry in fs/cifs/dir.c.
1692 *
1693 * If @stop_on_nosnap, generate path relative to the first non-snapped
1694 * inode.
1695 *
1696 * Encode hidden .snap dirs as a double /, i.e.
1697 * foo/.snap/bar -> foo//bar
1698 */
1699char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1700 int stop_on_nosnap)
1701{
1702 struct dentry *temp;
1703 char *path;
1704 int len, pos;
1b71fe2e 1705 unsigned seq;
2f2dc053
SW		 1706
1707 if (dentry == NULL)
1708 return ERR_PTR(-EINVAL);
1709
1710retry:
1711 len = 0;
1b71fe2e
AV		 1712 seq = read_seqbegin(&rename_lock);
1713 rcu_read_lock();
2f2dc053
SW		 1714 for (temp = dentry; !IS_ROOT(temp);) {
1715 struct inode *inode = temp->d_inode;
1716 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1717 len++; /* slash only */
1718 else if (stop_on_nosnap && inode &&
1719 ceph_snap(inode) == CEPH_NOSNAP)
1720 break;
1721 else
1722 len += 1 + temp->d_name.len;
1723 temp = temp->d_parent;
2f2dc053 1724 }
1b71fe2e 1725 rcu_read_unlock();
2f2dc053
SW		 1726 if (len)
1727 len--; /* no leading '/' */
1728
1729 path = kmalloc(len+1, GFP_NOFS);
1730 if (path == NULL)
1731 return ERR_PTR(-ENOMEM);
1732 pos = len;
1733 path[pos] = 0; /* trailing null */
1b71fe2e 1734 rcu_read_lock();
2f2dc053 1735 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1b71fe2e 1736 struct inode *inode;
2f2dc053 1737
1b71fe2e
AV		 1738 spin_lock(&temp->d_lock);
1739 inode = temp->d_inode;
2f2dc053 1740 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
104648ad 1741 dout("build_path path+%d: %p SNAPDIR\n",
2f2dc053
SW		 1742 pos, temp);
1743 } else if (stop_on_nosnap && inode &&
1744 ceph_snap(inode) == CEPH_NOSNAP) {
9d5a09e6 1745 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1746 break;
1747 } else {
1748 pos -= temp->d_name.len;
1b71fe2e
AV		 1749 if (pos < 0) {
1750 spin_unlock(&temp->d_lock);
2f2dc053 1751 break;
1b71fe2e 1752 }
2f2dc053
SW		 1753 strncpy(path + pos, temp->d_name.name,
1754 temp->d_name.len);
2f2dc053 1755 }
1b71fe2e 1756 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1757 if (pos)
1758 path[--pos] = '/';
1759 temp = temp->d_parent;
2f2dc053 1760 }
1b71fe2e
AV		 1761 rcu_read_unlock();
1762 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
104648ad 1763 pr_err("build_path did not end path lookup where "
2f2dc053
SW		 1764 "expected, namelen is %d, pos is %d\n", len, pos);
1765 /* presumably this is only possible if racing with a
1766 rename of one of the parent directories (we can not
1767 lock the dentries above us to prevent this, but
1768 retrying should be harmless) */
1769 kfree(path);
1770 goto retry;
1771 }
1772
1773 *base = ceph_ino(temp->d_inode);
1774 *plen = len;
104648ad 1775 dout("build_path on %p %d built %llx '%.*s'\n",
84d08fa8 1776 dentry, d_count(dentry), *base, len, path);
2f2dc053
SW		 1777 return path;
1778}
1779
1780static int build_dentry_path(struct dentry *dentry,
1781 const char **ppath, int *ppathlen, u64 *pino,
1782 int *pfreepath)
1783{
1784 char *path;
1785
1786 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1787 *pino = ceph_ino(dentry->d_parent->d_inode);
1788 *ppath = dentry->d_name.name;
1789 *ppathlen = dentry->d_name.len;
1790 return 0;
1791 }
1792 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1793 if (IS_ERR(path))
1794 return PTR_ERR(path);
1795 *ppath = path;
1796 *pfreepath = 1;
1797 return 0;
1798}
1799
1800static int build_inode_path(struct inode *inode,
1801 const char **ppath, int *ppathlen, u64 *pino,
1802 int *pfreepath)
1803{
1804 struct dentry *dentry;
1805 char *path;
1806
1807 if (ceph_snap(inode) == CEPH_NOSNAP) {
1808 *pino = ceph_ino(inode);
1809 *ppathlen = 0;
1810 return 0;
1811 }
1812 dentry = d_find_alias(inode);
1813 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1814 dput(dentry);
1815 if (IS_ERR(path))
1816 return PTR_ERR(path);
1817 *ppath = path;
1818 *pfreepath = 1;
1819 return 0;
1820}
1821
1822/*
1823 * request arguments may be specified via an inode *, a dentry *, or
1824 * an explicit ino+path.
1825 */
1826static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1827 const char *rpath, u64 rino,
1828 const char **ppath, int *pathlen,
1829 u64 *ino, int *freepath)
1830{
1831 int r = 0;
1832
1833 if (rinode) {
1834 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1835 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1836 ceph_snap(rinode));
1837 } else if (rdentry) {
1838 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1839 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1840 *ppath);
795858db 1841 } else if (rpath || rino) {
2f2dc053
SW		 1842 *ino = rino;
1843 *ppath = rpath;
b000056a 1844 *pathlen = rpath ? strlen(rpath) : 0;
2f2dc053
SW		 1845 dout(" path %.*s\n", *pathlen, rpath);
1846 }
1847
1848 return r;
1849}
1850
1851/*
1852 * called under mdsc->mutex
1853 */
1854static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1855 struct ceph_mds_request *req,
6e6f0923 1856 int mds, bool drop_cap_releases)
2f2dc053
SW		 1857{
1858 struct ceph_msg *msg;
1859 struct ceph_mds_request_head *head;
1860 const char *path1 = NULL;
1861 const char *path2 = NULL;
1862 u64 ino1 = 0, ino2 = 0;
1863 int pathlen1 = 0, pathlen2 = 0;
1864 int freepath1 = 0, freepath2 = 0;
1865 int len;
1866 u16 releases;
1867 void *p, *end;
1868 int ret;
1869
1870 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1871 req->r_path1, req->r_ino1.ino,
1872 &path1, &pathlen1, &ino1, &freepath1);
1873 if (ret < 0) {
1874 msg = ERR_PTR(ret);
1875 goto out;
1876 }
1877
1878 ret = set_request_path_attr(NULL, req->r_old_dentry,
1879 req->r_path2, req->r_ino2.ino,
1880 &path2, &pathlen2, &ino2, &freepath2);
1881 if (ret < 0) {
1882 msg = ERR_PTR(ret);
1883 goto out_free1;
1884 }
1885
1886 len = sizeof(*head) +
b8e69066
SW		 1887 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
1888 sizeof(struct timespec);
2f2dc053
SW		 1889
1890 /* calculate (max) length for cap releases */
1891 len += sizeof(struct ceph_mds_request_release) *
1892 (!!req->r_inode_drop + !!req->r_dentry_drop +
1893 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1894 if (req->r_dentry_drop)
1895 len += req->r_dentry->d_name.len;
1896 if (req->r_old_dentry_drop)
1897 len += req->r_old_dentry->d_name.len;
1898
b61c2763 1899 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
a79832f2
SW		 1900 if (!msg) {
1901 msg = ERR_PTR(-ENOMEM);
2f2dc053 1902 goto out_free2;
a79832f2 1903 }
2f2dc053 1904
7cfa0313 1905 msg->hdr.version = cpu_to_le16(2);
6df058c0
SW		 1906 msg->hdr.tid = cpu_to_le64(req->r_tid);
1907
2f2dc053
SW		 1908 head = msg->front.iov_base;
1909 p = msg->front.iov_base + sizeof(*head);
1910 end = msg->front.iov_base + msg->front.iov_len;
1911
1912 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1913 head->op = cpu_to_le32(req->r_op);
ff3d0046
EB		 1914 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1915 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2f2dc053
SW		 1916 head->args = req->r_args;
1917
1918 ceph_encode_filepath(&p, end, ino1, path1);
1919 ceph_encode_filepath(&p, end, ino2, path2);
1920
e979cf50
SW		 1921 /* make note of release offset, in case we need to replay */
1922 req->r_request_release_offset = p - msg->front.iov_base;
1923
2f2dc053
SW		 1924 /* cap releases */
1925 releases = 0;
1926 if (req->r_inode_drop)
1927 releases += ceph_encode_inode_release(&p,
1928 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1929 mds, req->r_inode_drop, req->r_inode_unless, 0);
1930 if (req->r_dentry_drop)
1931 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1932 mds, req->r_dentry_drop, req->r_dentry_unless);
1933 if (req->r_old_dentry_drop)
1934 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1935 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1936 if (req->r_old_inode_drop)
1937 releases += ceph_encode_inode_release(&p,
1938 req->r_old_dentry->d_inode,
1939 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
6e6f0923
YZ		 1940
1941 if (drop_cap_releases) {
1942 releases = 0;
1943 p = msg->front.iov_base + req->r_request_release_offset;
1944 }
1945
2f2dc053
SW		 1946 head->num_releases = cpu_to_le16(releases);
1947
b8e69066 1948 /* time stamp */
1f041a89
YZ		 1949 {
1950 struct ceph_timespec ts;
1951 ceph_encode_timespec(&ts, &req->r_stamp);
1952 ceph_encode_copy(&p, &ts, sizeof(ts));
1953 }
b8e69066 1954
2f2dc053
SW		 1955 BUG_ON(p > end);
1956 msg->front.iov_len = p - msg->front.iov_base;
1957 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1958
25e6bae3
YZ		 1959 if (req->r_pagelist) {
1960 struct ceph_pagelist *pagelist = req->r_pagelist;
1961 atomic_inc(&pagelist->refcnt);
1962 ceph_msg_data_add_pagelist(msg, pagelist);
1963 msg->hdr.data_len = cpu_to_le32(pagelist->length);
1964 } else {
1965 msg->hdr.data_len = 0;
ebf18f47 1966 }
02afca6c 1967
2f2dc053
SW		 1968 msg->hdr.data_off = cpu_to_le16(0);
1969
1970out_free2:
1971 if (freepath2)
1972 kfree((char *)path2);
1973out_free1:
1974 if (freepath1)
1975 kfree((char *)path1);
1976out:
1977 return msg;
1978}
1979
1980/*
1981 * called under mdsc->mutex if error, under no mutex if
1982 * success.
1983 */
1984static void complete_request(struct ceph_mds_client *mdsc,
1985 struct ceph_mds_request *req)
1986{
1987 if (req->r_callback)
1988 req->r_callback(mdsc, req);
1989 else
03066f23 1990 complete_all(&req->r_completion);
2f2dc053
SW		 1991}
1992
1993/*
1994 * called under mdsc->mutex
1995 */
1996static int __prepare_send_request(struct ceph_mds_client *mdsc,
1997 struct ceph_mds_request *req,
6e6f0923 1998 int mds, bool drop_cap_releases)
2f2dc053
SW		 1999{
2000 struct ceph_mds_request_head *rhead;
2001 struct ceph_msg *msg;
2002 int flags = 0;
2003
2f2dc053 2004 req->r_attempts++;
e55b71f8
GF		 2005 if (req->r_inode) {
2006 struct ceph_cap *cap =
2007 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2008
2009 if (cap)
2010 req->r_sent_on_mseq = cap->mseq;
2011 else
2012 req->r_sent_on_mseq = -1;
2013 }
2f2dc053
SW		 2014 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2015 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2016
01a92f17 2017 if (req->r_got_unsafe) {
c5c9a0bf 2018 void *p;
01a92f17
SW		 2019 /*
2020 * Replay. Do not regenerate message (and rebuild
2021 * paths, etc.); just use the original message.
2022 * Rebuilding paths will break for renames because
2023 * d_move mangles the src name.
2024 */
2025 msg = req->r_request;
2026 rhead = msg->front.iov_base;
2027
2028 flags = le32_to_cpu(rhead->flags);
2029 flags |= CEPH_MDS_FLAG_REPLAY;
2030 rhead->flags = cpu_to_le32(flags);
2031
2032 if (req->r_target_inode)
2033 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2034
2035 rhead->num_retry = req->r_attempts - 1;
e979cf50
SW		 2036
2037 /* remove cap/dentry releases from message */
2038 rhead->num_releases = 0;
c5c9a0bf
YZ		 2039
2040 /* time stamp */
2041 p = msg->front.iov_base + req->r_request_release_offset;
1f041a89
YZ		 2042 {
2043 struct ceph_timespec ts;
2044 ceph_encode_timespec(&ts, &req->r_stamp);
2045 ceph_encode_copy(&p, &ts, sizeof(ts));
2046 }
c5c9a0bf
YZ		 2047
2048 msg->front.iov_len = p - msg->front.iov_base;
2049 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 2050 return 0;
2051 }
2052
2f2dc053
SW		 2053 if (req->r_request) {
2054 ceph_msg_put(req->r_request);
2055 req->r_request = NULL;
2056 }
6e6f0923 2057 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2f2dc053 2058 if (IS_ERR(msg)) {
e1518c7c 2059 req->r_err = PTR_ERR(msg);
2f2dc053 2060 complete_request(mdsc, req);
a79832f2 2061 return PTR_ERR(msg);
2f2dc053
SW		 2062 }
2063 req->r_request = msg;
2064
2065 rhead = msg->front.iov_base;
2f2dc053
SW		 2066 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2067 if (req->r_got_unsafe)
2068 flags |= CEPH_MDS_FLAG_REPLAY;
2069 if (req->r_locked_dir)
2070 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2071 rhead->flags = cpu_to_le32(flags);
2072 rhead->num_fwd = req->r_num_fwd;
2073 rhead->num_retry = req->r_attempts - 1;
01a92f17 2074 rhead->ino = 0;
2f2dc053
SW		 2075
2076 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2f2dc053
SW		 2077 return 0;
2078}
2079
2080/*
2081 * send request, or put it on the appropriate wait list.
2082 */
2083static int __do_request(struct ceph_mds_client *mdsc,
2084 struct ceph_mds_request *req)
2085{
2086 struct ceph_mds_session *session = NULL;
2087 int mds = -1;
2088 int err = -EAGAIN;
2089
eb1b8af3
YZ		 2090 if (req->r_err || req->r_got_result) {
2091 if (req->r_aborted)
2092 __unregister_request(mdsc, req);
2f2dc053 2093 goto out;
eb1b8af3 2094 }
2f2dc053
SW		 2095
2096 if (req->r_timeout &&
2097 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2098 dout("do_request timed out\n");
2099 err = -EIO;
2100 goto finish;
2101 }
2102
dc69e2e9
SW		 2103 put_request_session(req);
2104
2f2dc053
SW		 2105 mds = __choose_mds(mdsc, req);
2106 if (mds < 0 ||
2107 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2108 dout("do_request no mds or not active, waiting for map\n");
2109 list_add(&req->r_wait, &mdsc->waiting_for_map);
2110 goto out;
2111 }
2112
2113 /* get, open session */
2114 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 2115 if (!session) {
2f2dc053 2116 session = register_session(mdsc, mds);
9c423956
SW		 2117 if (IS_ERR(session)) {
2118 err = PTR_ERR(session);
2119 goto finish;
2120 }
2121 }
dc69e2e9
SW		 2122 req->r_session = get_session(session);
2123
2f2dc053 2124 dout("do_request mds%d session %p state %s\n", mds, session,
a687ecaf 2125 ceph_session_state_name(session->s_state));
2f2dc053
SW		 2126 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2127 session->s_state != CEPH_MDS_SESSION_HUNG) {
2128 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2129 session->s_state == CEPH_MDS_SESSION_CLOSING)
2130 __open_session(mdsc, session);
2131 list_add(&req->r_wait, &session->s_waiting);
2132 goto out_session;
2133 }
2134
2135 /* send request */
2f2dc053
SW		 2136 req->r_resend_mds = -1; /* forget any previous mds hint */
2137
2138 if (req->r_request_started == 0) /* note request start time */
2139 req->r_request_started = jiffies;
2140
6e6f0923 2141 err = __prepare_send_request(mdsc, req, mds, false);
2f2dc053
SW		 2142 if (!err) {
2143 ceph_msg_get(req->r_request);
2144 ceph_con_send(&session->s_con, req->r_request);
2145 }
2146
2147out_session:
2148 ceph_put_mds_session(session);
2149out:
2150 return err;
2151
2152finish:
e1518c7c 2153 req->r_err = err;
2f2dc053
SW		 2154 complete_request(mdsc, req);
2155 goto out;
2156}
2157
2158/*
2159 * called under mdsc->mutex
2160 */
2161static void __wake_requests(struct ceph_mds_client *mdsc,
2162 struct list_head *head)
2163{
ed75ec2c
YZ		 2164 struct ceph_mds_request *req;
2165 LIST_HEAD(tmp_list);
2166
2167 list_splice_init(head, &tmp_list);
2f2dc053 2168
ed75ec2c
YZ		 2169 while (!list_empty(&tmp_list)) {
2170 req = list_entry(tmp_list.next,
2171 struct ceph_mds_request, r_wait);
2f2dc053 2172 list_del_init(&req->r_wait);
7971bd92 2173 dout(" wake request %p tid %llu\n", req, req->r_tid);
2f2dc053
SW		 2174 __do_request(mdsc, req);
2175 }
2176}
2177
2178/*
2179 * Wake up threads with requests pending for @mds, so that they can
29790f26 2180 * resubmit their requests to a possibly different mds.
2f2dc053 2181 */
29790f26 2182static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 2183{
44ca18f2 2184 struct ceph_mds_request *req;
282c1052 2185 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053
SW		 2186
2187 dout("kick_requests mds%d\n", mds);
282c1052 2188 while (p) {
44ca18f2 2189 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 2190 p = rb_next(p);
44ca18f2
SW		 2191 if (req->r_got_unsafe)
2192 continue;
3de22be6
YZ		 2193 if (req->r_attempts > 0)
2194 continue; /* only new requests */
44ca18f2
SW		 2195 if (req->r_session &&
2196 req->r_session->s_mds == mds) {
2197 dout(" kicking tid %llu\n", req->r_tid);
03974e81 2198 list_del_init(&req->r_wait);
44ca18f2 2199 __do_request(mdsc, req);
2f2dc053
SW		 2200 }
2201 }
2202}
2203
2204void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2205 struct ceph_mds_request *req)
2206{
2207 dout("submit_request on %p\n", req);
2208 mutex_lock(&mdsc->mutex);
2209 __register_request(mdsc, req, NULL);
2210 __do_request(mdsc, req);
2211 mutex_unlock(&mdsc->mutex);
2212}
2213
2214/*
2215 * Synchrously perform an mds request. Take care of all of the
2216 * session setup, forwarding, retry details.
2217 */
2218int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2219 struct inode *dir,
2220 struct ceph_mds_request *req)
2221{
2222 int err;
2223
2224 dout("do_request on %p\n", req);
2225
2226 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2227 if (req->r_inode)
2228 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2229 if (req->r_locked_dir)
2230 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
844d87c3 2231 if (req->r_old_dentry_dir)
41b02e1f
SW		 2232 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2233 CEPH_CAP_PIN);
2f2dc053
SW		 2234
2235 /* issue */
2236 mutex_lock(&mdsc->mutex);
2237 __register_request(mdsc, req, dir);
2238 __do_request(mdsc, req);
2239
e1518c7c
SW		 2240 if (req->r_err) {
2241 err = req->r_err;
2242 __unregister_request(mdsc, req);
2243 dout("do_request early error %d\n", err);
2244 goto out;
2f2dc053
SW		 2245 }
2246
e1518c7c
SW		 2247 /* wait */
2248 mutex_unlock(&mdsc->mutex);
2249 dout("do_request waiting\n");
2250 if (req->r_timeout) {
aa91647c 2251 err = (long)wait_for_completion_killable_timeout(
e1518c7c
SW		 2252 &req->r_completion, req->r_timeout);
2253 if (err == 0)
2254 err = -EIO;
9280be24
YZ		 2255 } else if (req->r_wait_for_completion) {
2256 err = req->r_wait_for_completion(mdsc, req);
e1518c7c 2257 } else {
aa91647c 2258 err = wait_for_completion_killable(&req->r_completion);
e1518c7c
SW		 2259 }
2260 dout("do_request waited, got %d\n", err);
2261 mutex_lock(&mdsc->mutex);
5b1daecd 2262
e1518c7c
SW		 2263 /* only abort if we didn't race with a real reply */
2264 if (req->r_got_result) {
2265 err = le32_to_cpu(req->r_reply_info.head->result);
2266 } else if (err < 0) {
2267 dout("aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 2268
2269 /*
2270 * ensure we aren't running concurrently with
2271 * ceph_fill_trace or ceph_readdir_prepopulate, which
2272 * rely on locks (dir mutex) held by our caller.
2273 */
2274 mutex_lock(&req->r_fill_mutex);
e1518c7c
SW		 2275 req->r_err = err;
2276 req->r_aborted = true;
b4556396 2277 mutex_unlock(&req->r_fill_mutex);
5b1daecd 2278
e1518c7c 2279 if (req->r_locked_dir &&
167c9e35
SW		 2280 (req->r_op & CEPH_MDS_OP_WRITE))
2281 ceph_invalidate_dir_request(req);
2f2dc053 2282 } else {
e1518c7c 2283 err = req->r_err;
2f2dc053 2284 }
2f2dc053 2285
e1518c7c
SW		 2286out:
2287 mutex_unlock(&mdsc->mutex);
2f2dc053
SW		 2288 dout("do_request %p done, result %d\n", req, err);
2289 return err;
2290}
2291
167c9e35 2292/*
2f276c51 2293 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 2294 * namespace request.
2295 */
2296void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2297{
2298 struct inode *inode = req->r_locked_dir;
167c9e35 2299
2f276c51 2300 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
167c9e35 2301
2f276c51 2302 ceph_dir_clear_complete(inode);
167c9e35
SW		 2303 if (req->r_dentry)
2304 ceph_invalidate_dentry_lease(req->r_dentry);
2305 if (req->r_old_dentry)
2306 ceph_invalidate_dentry_lease(req->r_old_dentry);
2307}
2308
2f2dc053
SW		 2309/*
2310 * Handle mds reply.
2311 *
2312 * We take the session mutex and parse and process the reply immediately.
2313 * This preserves the logical ordering of replies, capabilities, etc., sent
2314 * by the MDS as they are applied to our local cache.
2315 */
2316static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2317{
2318 struct ceph_mds_client *mdsc = session->s_mdsc;
2319 struct ceph_mds_request *req;
2320 struct ceph_mds_reply_head *head = msg->front.iov_base;
2321 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
982d6011 2322 struct ceph_snap_realm *realm;
2f2dc053
SW		 2323 u64 tid;
2324 int err, result;
2600d2dd 2325 int mds = session->s_mds;
2f2dc053 2326
2f2dc053
SW		 2327 if (msg->front.iov_len < sizeof(*head)) {
2328 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
9ec7cab1 2329 ceph_msg_dump(msg);
2f2dc053
SW		 2330 return;
2331 }
2332
2333 /* get request, session */
6df058c0 2334 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2335 mutex_lock(&mdsc->mutex);
2336 req = __lookup_request(mdsc, tid);
2337 if (!req) {
2338 dout("handle_reply on unknown tid %llu\n", tid);
2339 mutex_unlock(&mdsc->mutex);
2340 return;
2341 }
2342 dout("handle_reply %p\n", req);
2f2dc053
SW		 2343
2344 /* correct session? */
d96d6049 2345 if (req->r_session != session) {
2f2dc053
SW		 2346 pr_err("mdsc_handle_reply got %llu on session mds%d"
2347 " not mds%d\n", tid, session->s_mds,
2348 req->r_session ? req->r_session->s_mds : -1);
2349 mutex_unlock(&mdsc->mutex);
2350 goto out;
2351 }
2352
2353 /* dup? */
2354 if ((req->r_got_unsafe && !head->safe) ||
2355 (req->r_got_safe && head->safe)) {
f3ae1b97 2356 pr_warn("got a dup %s reply on %llu from mds%d\n",
2f2dc053
SW		 2357 head->safe ? "safe" : "unsafe", tid, mds);
2358 mutex_unlock(&mdsc->mutex);
2359 goto out;
2360 }
85792d0d 2361 if (req->r_got_safe && !head->safe) {
f3ae1b97 2362 pr_warn("got unsafe after safe on %llu from mds%d\n",
85792d0d
SW		 2363 tid, mds);
2364 mutex_unlock(&mdsc->mutex);
2365 goto out;
2366 }
2f2dc053
SW		 2367
2368 result = le32_to_cpu(head->result);
2369
2370 /*
e55b71f8
GF		 2371 * Handle an ESTALE
2372 * if we're not talking to the authority, send to them
2373 * if the authority has changed while we weren't looking,
2374 * send to new authority
2375 * Otherwise we just have to return an ESTALE
2f2dc053
SW		 2376 */
2377 if (result == -ESTALE) {
e55b71f8 2378 dout("got ESTALE on request %llu", req->r_tid);
51da8e8c 2379 req->r_resend_mds = -1;
ca18bede 2380 if (req->r_direct_mode != USE_AUTH_MDS) {
e55b71f8
GF		 2381 dout("not using auth, setting for that now");
2382 req->r_direct_mode = USE_AUTH_MDS;
2f2dc053
SW		 2383 __do_request(mdsc, req);
2384 mutex_unlock(&mdsc->mutex);
2385 goto out;
e55b71f8 2386 } else {
ca18bede
YZ		 2387 int mds = __choose_mds(mdsc, req);
2388 if (mds >= 0 && mds != req->r_session->s_mds) {
2389 dout("but auth changed, so resending");
e55b71f8
GF		 2390 __do_request(mdsc, req);
2391 mutex_unlock(&mdsc->mutex);
2392 goto out;
2393 }
2f2dc053 2394 }
e55b71f8 2395 dout("have to return ESTALE on request %llu", req->r_tid);
2f2dc053
SW		 2396 }
2397
e55b71f8 2398
2f2dc053
SW		 2399 if (head->safe) {
2400 req->r_got_safe = true;
2401 __unregister_request(mdsc, req);
2f2dc053
SW		 2402
2403 if (req->r_got_unsafe) {
2404 /*
2405 * We already handled the unsafe response, now do the
2406 * cleanup. No need to examine the response; the MDS
2407 * doesn't include any result info in the safe
2408 * response. And even if it did, there is nothing
2409 * useful we could do with a revised return value.
2410 */
2411 dout("got safe reply %llu, mds%d\n", tid, mds);
2412 list_del_init(&req->r_unsafe_item);
2413
2414 /* last unsafe request during umount? */
44ca18f2 2415 if (mdsc->stopping && !__get_oldest_req(mdsc))
03066f23 2416 complete_all(&mdsc->safe_umount_waiters);
2f2dc053
SW		 2417 mutex_unlock(&mdsc->mutex);
2418 goto out;
2419 }
e1518c7c 2420 } else {
2f2dc053
SW		 2421 req->r_got_unsafe = true;
2422 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2423 }
2424
2425 dout("handle_reply tid %lld result %d\n", tid, result);
2426 rinfo = &req->r_reply_info;
14303d20 2427 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2f2dc053
SW		 2428 mutex_unlock(&mdsc->mutex);
2429
2430 mutex_lock(&session->s_mutex);
2431 if (err < 0) {
25933abd 2432 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
9ec7cab1 2433 ceph_msg_dump(msg);
2f2dc053
SW		 2434 goto out_err;
2435 }
2436
2437 /* snap trace */
982d6011 2438 realm = NULL;
2f2dc053
SW		 2439 if (rinfo->snapblob_len) {
2440 down_write(&mdsc->snap_rwsem);
2441 ceph_update_snap_trace(mdsc, rinfo->snapblob,
982d6011
YZ		 2442 rinfo->snapblob + rinfo->snapblob_len,
2443 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2444 &realm);
2f2dc053
SW		 2445 downgrade_write(&mdsc->snap_rwsem);
2446 } else {
2447 down_read(&mdsc->snap_rwsem);
2448 }
2449
2450 /* insert trace into our cache */
b4556396 2451 mutex_lock(&req->r_fill_mutex);
3d14c5d2 2452 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2f2dc053 2453 if (err == 0) {
6e8575fa 2454 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 2455 req->r_op == CEPH_MDS_OP_LSSNAP))
2f2dc053 2456 ceph_readdir_prepopulate(req, req->r_session);
37151668 2457 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2f2dc053 2458 }
b4556396 2459 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 2460
2461 up_read(&mdsc->snap_rwsem);
982d6011
YZ		 2462 if (realm)
2463 ceph_put_snap_realm(mdsc, realm);
2f2dc053 2464out_err:
e1518c7c
SW		 2465 mutex_lock(&mdsc->mutex);
2466 if (!req->r_aborted) {
2467 if (err) {
2468 req->r_err = err;
2469 } else {
2470 req->r_reply = msg;
2471 ceph_msg_get(msg);
2472 req->r_got_result = true;
2473 }
2f2dc053 2474 } else {
e1518c7c 2475 dout("reply arrived after request %lld was aborted\n", tid);
2f2dc053 2476 }
e1518c7c 2477 mutex_unlock(&mdsc->mutex);
2f2dc053 2478
ee6b272b 2479 ceph_add_cap_releases(mdsc, req->r_session);
2f2dc053
SW		 2480 mutex_unlock(&session->s_mutex);
2481
2482 /* kick calling process */
2483 complete_request(mdsc, req);
2484out:
2485 ceph_mdsc_put_request(req);
2486 return;
2487}
2488
2489
2490
2491/*
2492 * handle mds notification that our request has been forwarded.
2493 */
2600d2dd
SW		 2494static void handle_forward(struct ceph_mds_client *mdsc,
2495 struct ceph_mds_session *session,
2496 struct ceph_msg *msg)
2f2dc053
SW		 2497{
2498 struct ceph_mds_request *req;
a1ea787c 2499 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2500 u32 next_mds;
2501 u32 fwd_seq;
2f2dc053
SW		 2502 int err = -EINVAL;
2503 void *p = msg->front.iov_base;
2504 void *end = p + msg->front.iov_len;
2f2dc053 2505
a1ea787c 2506 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 2507 next_mds = ceph_decode_32(&p);
2508 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 2509
2510 mutex_lock(&mdsc->mutex);
2511 req = __lookup_request(mdsc, tid);
2512 if (!req) {
2a8e5e36 2513 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2f2dc053
SW		 2514 goto out; /* dup reply? */
2515 }
2516
2a8e5e36
SW		 2517 if (req->r_aborted) {
2518 dout("forward tid %llu aborted, unregistering\n", tid);
2519 __unregister_request(mdsc, req);
2520 } else if (fwd_seq <= req->r_num_fwd) {
2521 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2f2dc053
SW		 2522 tid, next_mds, req->r_num_fwd, fwd_seq);
2523 } else {
2524 /* resend. forward race not possible; mds would drop */
2a8e5e36
SW		 2525 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2526 BUG_ON(req->r_err);
2527 BUG_ON(req->r_got_result);
3de22be6 2528 req->r_attempts = 0;
2f2dc053
SW		 2529 req->r_num_fwd = fwd_seq;
2530 req->r_resend_mds = next_mds;
2531 put_request_session(req);
2532 __do_request(mdsc, req);
2533 }
2534 ceph_mdsc_put_request(req);
2535out:
2536 mutex_unlock(&mdsc->mutex);
2537 return;
2538
2539bad:
2540 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2541}
2542
2543/*
2544 * handle a mds session control message
2545 */
2546static void handle_session(struct ceph_mds_session *session,
2547 struct ceph_msg *msg)
2548{
2549 struct ceph_mds_client *mdsc = session->s_mdsc;
2550 u32 op;
2551 u64 seq;
2600d2dd 2552 int mds = session->s_mds;
2f2dc053
SW		 2553 struct ceph_mds_session_head *h = msg->front.iov_base;
2554 int wake = 0;
2555
2f2dc053
SW		 2556 /* decode */
2557 if (msg->front.iov_len != sizeof(*h))
2558 goto bad;
2559 op = le32_to_cpu(h->op);
2560 seq = le64_to_cpu(h->seq);
2561
2562 mutex_lock(&mdsc->mutex);
2600d2dd
SW		 2563 if (op == CEPH_SESSION_CLOSE)
2564 __unregister_session(mdsc, session);
2f2dc053
SW		 2565 /* FIXME: this ttl calculation is generous */
2566 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2567 mutex_unlock(&mdsc->mutex);
2568
2569 mutex_lock(&session->s_mutex);
2570
2571 dout("handle_session mds%d %s %p state %s seq %llu\n",
2572 mds, ceph_session_op_name(op), session,
a687ecaf 2573 ceph_session_state_name(session->s_state), seq);
2f2dc053
SW		 2574
2575 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2576 session->s_state = CEPH_MDS_SESSION_OPEN;
2577 pr_info("mds%d came back\n", session->s_mds);
2578 }
2579
2580 switch (op) {
2581 case CEPH_SESSION_OPEN:
29790f26
SW		 2582 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2583 pr_info("mds%d reconnect success\n", session->s_mds);
2f2dc053
SW		 2584 session->s_state = CEPH_MDS_SESSION_OPEN;
2585 renewed_caps(mdsc, session, 0);
2586 wake = 1;
2587 if (mdsc->stopping)
2588 __close_session(mdsc, session);
2589 break;
2590
2591 case CEPH_SESSION_RENEWCAPS:
2592 if (session->s_renew_seq == seq)
2593 renewed_caps(mdsc, session, 1);
2594 break;
2595
2596 case CEPH_SESSION_CLOSE:
29790f26
SW		 2597 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2598 pr_info("mds%d reconnect denied\n", session->s_mds);
2f2dc053 2599 remove_session_caps(session);
656e4382 2600 wake = 2; /* for good measure */
f3c60c59 2601 wake_up_all(&mdsc->session_close_wq);
2f2dc053
SW		 2602 break;
2603
2604 case CEPH_SESSION_STALE:
2605 pr_info("mds%d caps went stale, renewing\n",
2606 session->s_mds);
d8fb02ab 2607 spin_lock(&session->s_gen_ttl_lock);
2f2dc053 2608 session->s_cap_gen++;
1ce208a6 2609 session->s_cap_ttl = jiffies - 1;
d8fb02ab 2610 spin_unlock(&session->s_gen_ttl_lock);
2f2dc053
SW		 2611 send_renew_caps(mdsc, session);
2612 break;
2613
2614 case CEPH_SESSION_RECALL_STATE:
2615 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2616 break;
2617
186e4f7a
YZ		 2618 case CEPH_SESSION_FLUSHMSG:
2619 send_flushmsg_ack(mdsc, session, seq);
2620 break;
2621
03f4fcb0
YZ		 2622 case CEPH_SESSION_FORCE_RO:
2623 dout("force_session_readonly %p\n", session);
2624 spin_lock(&session->s_cap_lock);
2625 session->s_readonly = true;
2626 spin_unlock(&session->s_cap_lock);
2627 wake_up_session_caps(session, 0);
2628 break;
2629
2f2dc053
SW		 2630 default:
2631 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2632 WARN_ON(1);
2633 }
2634
2635 mutex_unlock(&session->s_mutex);
2636 if (wake) {
2637 mutex_lock(&mdsc->mutex);
2638 __wake_requests(mdsc, &session->s_waiting);
656e4382
YZ		 2639 if (wake == 2)
2640 kick_requests(mdsc, mds);
2f2dc053
SW		 2641 mutex_unlock(&mdsc->mutex);
2642 }
2643 return;
2644
2645bad:
2646 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2647 (int)msg->front.iov_len);
9ec7cab1 2648 ceph_msg_dump(msg);
2f2dc053
SW		 2649 return;
2650}
2651
2652
2653/*
2654 * called under session->mutex.
2655 */
2656static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2657 struct ceph_mds_session *session)
2658{
2659 struct ceph_mds_request *req, *nreq;
3de22be6 2660 struct rb_node *p;
2f2dc053
SW		 2661 int err;
2662
2663 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2664
2665 mutex_lock(&mdsc->mutex);
2666 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
6e6f0923 2667 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2f2dc053
SW		 2668 if (!err) {
2669 ceph_msg_get(req->r_request);
2670 ceph_con_send(&session->s_con, req->r_request);
2671 }
2672 }
3de22be6
YZ		 2673
2674 /*
2675 * also re-send old requests when MDS enters reconnect stage. So that MDS
2676 * can process completed request in clientreplay stage.
2677 */
2678 p = rb_first(&mdsc->request_tree);
2679 while (p) {
2680 req = rb_entry(p, struct ceph_mds_request, r_node);
2681 p = rb_next(p);
2682 if (req->r_got_unsafe)
2683 continue;
2684 if (req->r_attempts == 0)
2685 continue; /* only old requests */
2686 if (req->r_session &&
2687 req->r_session->s_mds == session->s_mds) {
6e6f0923
YZ		 2688 err = __prepare_send_request(mdsc, req,
2689 session->s_mds, true);
3de22be6
YZ		 2690 if (!err) {
2691 ceph_msg_get(req->r_request);
2692 ceph_con_send(&session->s_con, req->r_request);
2693 }
2694 }
2695 }
2f2dc053
SW		 2696 mutex_unlock(&mdsc->mutex);
2697}
2698
2699/*
2700 * Encode information about a cap for a reconnect with the MDS.
2701 */
2f2dc053
SW		 2702static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2703 void *arg)
2704{
20cb34ae
SW		 2705 union {
2706 struct ceph_mds_cap_reconnect v2;
2707 struct ceph_mds_cap_reconnect_v1 v1;
2708 } rec;
2709 size_t reclen;
2f2dc053 2710 struct ceph_inode_info *ci;
20cb34ae
SW		 2711 struct ceph_reconnect_state *recon_state = arg;
2712 struct ceph_pagelist *pagelist = recon_state->pagelist;
2f2dc053
SW		 2713 char *path;
2714 int pathlen, err;
2715 u64 pathbase;
2716 struct dentry *dentry;
2717
2718 ci = cap->ci;
2719
2720 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2721 inode, ceph_vinop(inode), cap, cap->cap_id,
2722 ceph_cap_string(cap->issued));
93cea5be
SW		 2723 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2724 if (err)
2725 return err;
2f2dc053
SW		 2726
2727 dentry = d_find_alias(inode);
2728 if (dentry) {
2729 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2730 if (IS_ERR(path)) {
2731 err = PTR_ERR(path);
e072f8aa 2732 goto out_dput;
2f2dc053
SW		 2733 }
2734 } else {
2735 path = NULL;
2736 pathlen = 0;
2737 }
93cea5be
SW		 2738 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2739 if (err)
e072f8aa 2740 goto out_free;
2f2dc053 2741
be655596 2742 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 2743 cap->seq = 0; /* reset cap seq */
2744 cap->issue_seq = 0; /* and issue_seq */
667ca05c 2745 cap->mseq = 0; /* and migrate_seq */
99a9c273 2746 cap->cap_gen = cap->session->s_cap_gen;
20cb34ae
SW		 2747
2748 if (recon_state->flock) {
2749 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2750 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2751 rec.v2.issued = cpu_to_le32(cap->issued);
2752 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2753 rec.v2.pathbase = cpu_to_le64(pathbase);
2754 rec.v2.flock_len = 0;
2755 reclen = sizeof(rec.v2);
2756 } else {
2757 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2758 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2759 rec.v1.issued = cpu_to_le32(cap->issued);
2760 rec.v1.size = cpu_to_le64(inode->i_size);
2761 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2762 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2763 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2764 rec.v1.pathbase = cpu_to_le64(pathbase);
2765 reclen = sizeof(rec.v1);
2766 }
be655596 2767 spin_unlock(&ci->i_ceph_lock);
2f2dc053 2768
40819f6f
GF		 2769 if (recon_state->flock) {
2770 int num_fcntl_locks, num_flock_locks;
39be95e9
JS		 2771 struct ceph_filelock *flocks;
2772
2773encode_again:
39be95e9 2774 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
39be95e9
JS		 2775 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2776 sizeof(struct ceph_filelock), GFP_NOFS);
2777 if (!flocks) {
2778 err = -ENOMEM;
2779 goto out_free;
2780 }
39be95e9
JS		 2781 err = ceph_encode_locks_to_buffer(inode, flocks,
2782 num_fcntl_locks,
2783 num_flock_locks);
39be95e9
JS		 2784 if (err) {
2785 kfree(flocks);
2786 if (err == -ENOSPC)
2787 goto encode_again;
2788 goto out_free;
2789 }
2790 /*
2791 * number of encoded locks is stable, so copy to pagelist
2792 */
2793 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
2794 (num_fcntl_locks+num_flock_locks) *
2795 sizeof(struct ceph_filelock));
2796 err = ceph_pagelist_append(pagelist, &rec, reclen);
2797 if (!err)
2798 err = ceph_locks_to_pagelist(flocks, pagelist,
2799 num_fcntl_locks,
2800 num_flock_locks);
2801 kfree(flocks);
3612abbd
SW		 2802 } else {
2803 err = ceph_pagelist_append(pagelist, &rec, reclen);
40819f6f 2804 }
44c99757
YZ		 2805
2806 recon_state->nr_caps++;
e072f8aa 2807out_free:
2f2dc053 2808 kfree(path);
e072f8aa 2809out_dput:
2f2dc053 2810 dput(dentry);
93cea5be 2811 return err;
2f2dc053
SW		 2812}
2813
2814
2815/*
2816 * If an MDS fails and recovers, clients need to reconnect in order to
2817 * reestablish shared state. This includes all caps issued through
2818 * this session _and_ the snap_realm hierarchy. Because it's not
2819 * clear which snap realms the mds cares about, we send everything we
2820 * know about.. that ensures we'll then get any new info the
2821 * recovering MDS might have.
2822 *
2823 * This is a relatively heavyweight operation, but it's rare.
2824 *
2825 * called with mdsc->mutex held.
2826 */
34b6c855
SW		 2827static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2828 struct ceph_mds_session *session)
2f2dc053 2829{
2f2dc053 2830 struct ceph_msg *reply;
a105f00c 2831 struct rb_node *p;
34b6c855 2832 int mds = session->s_mds;
9abf82b8 2833 int err = -ENOMEM;
44c99757 2834 int s_nr_caps;
93cea5be 2835 struct ceph_pagelist *pagelist;
20cb34ae 2836 struct ceph_reconnect_state recon_state;
2f2dc053 2837
34b6c855 2838 pr_info("mds%d reconnect start\n", mds);
2f2dc053 2839
93cea5be
SW		 2840 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2841 if (!pagelist)
2842 goto fail_nopagelist;
2843 ceph_pagelist_init(pagelist);
2844
b61c2763 2845 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
a79832f2 2846 if (!reply)
93cea5be 2847 goto fail_nomsg;
93cea5be 2848
34b6c855
SW		 2849 mutex_lock(&session->s_mutex);
2850 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2851 session->s_seq = 0;
2f2dc053 2852
2f2dc053 2853 dout("session %p state %s\n", session,
a687ecaf 2854 ceph_session_state_name(session->s_state));
2f2dc053 2855
99a9c273
YZ		 2856 spin_lock(&session->s_gen_ttl_lock);
2857 session->s_cap_gen++;
2858 spin_unlock(&session->s_gen_ttl_lock);
2859
2860 spin_lock(&session->s_cap_lock);
03f4fcb0
YZ		 2861 /* don't know if session is readonly */
2862 session->s_readonly = 0;
99a9c273
YZ		 2863 /*
2864 * notify __ceph_remove_cap() that we are composing cap reconnect.
2865 * If a cap get released before being added to the cap reconnect,
2866 * __ceph_remove_cap() should skip queuing cap release.
2867 */
2868 session->s_cap_reconnect = 1;
e01a5946
SW		 2869 /* drop old cap expires; we're about to reestablish that state */
2870 discard_cap_releases(mdsc, session);
99a9c273 2871 spin_unlock(&session->s_cap_lock);
e01a5946 2872
5d23371f
YZ		 2873 /* trim unused caps to reduce MDS's cache rejoin time */
2874 shrink_dcache_parent(mdsc->fsc->sb->s_root);
2875
2876 ceph_con_close(&session->s_con);
2877 ceph_con_open(&session->s_con,
2878 CEPH_ENTITY_TYPE_MDS, mds,
2879 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2880
2881 /* replay unsafe requests */
2882 replay_unsafe_requests(mdsc, session);
2883
2884 down_read(&mdsc->snap_rwsem);
2885
2f2dc053 2886 /* traverse this session's caps */
44c99757
YZ		 2887 s_nr_caps = session->s_nr_caps;
2888 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
93cea5be
SW		 2889 if (err)
2890 goto fail;
20cb34ae 2891
44c99757 2892 recon_state.nr_caps = 0;
20cb34ae
SW		 2893 recon_state.pagelist = pagelist;
2894 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2895 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2f2dc053 2896 if (err < 0)
9abf82b8 2897 goto fail;
2f2dc053 2898
99a9c273
YZ		 2899 spin_lock(&session->s_cap_lock);
2900 session->s_cap_reconnect = 0;
2901 spin_unlock(&session->s_cap_lock);
2902
2f2dc053
SW		 2903 /*
2904 * snaprealms. we provide mds with the ino, seq (version), and
2905 * parent for all of our realms. If the mds has any newer info,
2906 * it will tell us.
2907 */
a105f00c
SW		 2908 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2909 struct ceph_snap_realm *realm =
2910 rb_entry(p, struct ceph_snap_realm, node);
93cea5be 2911 struct ceph_mds_snaprealm_reconnect sr_rec;
2f2dc053
SW		 2912
2913 dout(" adding snap realm %llx seq %lld parent %llx\n",
2914 realm->ino, realm->seq, realm->parent_ino);
93cea5be
SW		 2915 sr_rec.ino = cpu_to_le64(realm->ino);
2916 sr_rec.seq = cpu_to_le64(realm->seq);
2917 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2918 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2919 if (err)
2920 goto fail;
2f2dc053 2921 }
2f2dc053 2922
20cb34ae
SW		 2923 if (recon_state.flock)
2924 reply->hdr.version = cpu_to_le16(2);
44c99757
YZ		 2925
2926 /* raced with cap release? */
2927 if (s_nr_caps != recon_state.nr_caps) {
2928 struct page *page = list_first_entry(&pagelist->head,
2929 struct page, lru);
2930 __le32 *addr = kmap_atomic(page);
2931 *addr = cpu_to_le32(recon_state.nr_caps);
2932 kunmap_atomic(addr);
ebf18f47 2933 }
44c99757
YZ		 2934
2935 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2936 ceph_msg_data_add_pagelist(reply, pagelist);
2f2dc053
SW		 2937 ceph_con_send(&session->s_con, reply);
2938
9abf82b8
SW		 2939 mutex_unlock(&session->s_mutex);
2940
2941 mutex_lock(&mdsc->mutex);
2942 __wake_requests(mdsc, &session->s_waiting);
2943 mutex_unlock(&mdsc->mutex);
2944
2f2dc053 2945 up_read(&mdsc->snap_rwsem);
2f2dc053
SW		 2946 return;
2947
93cea5be 2948fail:
2f2dc053 2949 ceph_msg_put(reply);
9abf82b8
SW		 2950 up_read(&mdsc->snap_rwsem);
2951 mutex_unlock(&session->s_mutex);
93cea5be
SW		 2952fail_nomsg:
2953 ceph_pagelist_release(pagelist);
93cea5be 2954fail_nopagelist:
9abf82b8 2955 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
9abf82b8 2956 return;
2f2dc053
SW		 2957}
2958
2959
2960/*
2961 * compare old and new mdsmaps, kicking requests
2962 * and closing out old connections as necessary
2963 *
2964 * called under mdsc->mutex.
2965 */
2966static void check_new_map(struct ceph_mds_client *mdsc,
2967 struct ceph_mdsmap *newmap,
2968 struct ceph_mdsmap *oldmap)
2969{
2970 int i;
2971 int oldstate, newstate;
2972 struct ceph_mds_session *s;
2973
2974 dout("check_new_map new %u old %u\n",
2975 newmap->m_epoch, oldmap->m_epoch);
2976
2977 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2978 if (mdsc->sessions[i] == NULL)
2979 continue;
2980 s = mdsc->sessions[i];
2981 oldstate = ceph_mdsmap_get_state(oldmap, i);
2982 newstate = ceph_mdsmap_get_state(newmap, i);
2983
0deb01c9 2984 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2f2dc053 2985 i, ceph_mds_state_name(oldstate),
0deb01c9 2986 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2f2dc053 2987 ceph_mds_state_name(newstate),
0deb01c9 2988 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
a687ecaf 2989 ceph_session_state_name(s->s_state));
2f2dc053 2990
3e8f43a0
YZ		 2991 if (i >= newmap->m_max_mds ||
2992 memcmp(ceph_mdsmap_get_addr(oldmap, i),
2f2dc053
SW		 2993 ceph_mdsmap_get_addr(newmap, i),
2994 sizeof(struct ceph_entity_addr))) {
2995 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2996 /* the session never opened, just close it
2997 * out now */
2998 __wake_requests(mdsc, &s->s_waiting);
2600d2dd 2999 __unregister_session(mdsc, s);
2f2dc053
SW		 3000 } else {
3001 /* just close it */
3002 mutex_unlock(&mdsc->mutex);
3003 mutex_lock(&s->s_mutex);
3004 mutex_lock(&mdsc->mutex);
3005 ceph_con_close(&s->s_con);
3006 mutex_unlock(&s->s_mutex);
3007 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3008 }
2f2dc053
SW		 3009 } else if (oldstate == newstate) {
3010 continue; /* nothing new with this mds */
3011 }
3012
3013 /*
3014 * send reconnect?
3015 */
3016 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 3017 newstate >= CEPH_MDS_STATE_RECONNECT) {
3018 mutex_unlock(&mdsc->mutex);
3019 send_mds_reconnect(mdsc, s);
3020 mutex_lock(&mdsc->mutex);
3021 }
2f2dc053
SW		 3022
3023 /*
29790f26 3024 * kick request on any mds that has gone active.
2f2dc053
SW		 3025 */
3026 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3027 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 3028 if (oldstate != CEPH_MDS_STATE_CREATING &&
3029 oldstate != CEPH_MDS_STATE_STARTING)
3030 pr_info("mds%d recovery completed\n", s->s_mds);
3031 kick_requests(mdsc, i);
2f2dc053 3032 ceph_kick_flushing_caps(mdsc, s);
0dc2570f 3033 wake_up_session_caps(s, 1);
2f2dc053
SW		 3034 }
3035 }
cb170a22
SW		 3036
3037 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
3038 s = mdsc->sessions[i];
3039 if (!s)
3040 continue;
3041 if (!ceph_mdsmap_is_laggy(newmap, i))
3042 continue;
3043 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3044 s->s_state == CEPH_MDS_SESSION_HUNG ||
3045 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3046 dout(" connecting to export targets of laggy mds%d\n",
3047 i);
3048 __open_export_target_sessions(mdsc, s);
3049 }
3050 }
2f2dc053
SW		 3051}
3052
3053
3054
3055/*
3056 * leases
3057 */
3058
3059/*
3060 * caller must hold session s_mutex, dentry->d_lock
3061 */
3062void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3063{
3064 struct ceph_dentry_info *di = ceph_dentry(dentry);
3065
3066 ceph_put_mds_session(di->lease_session);
3067 di->lease_session = NULL;
3068}
3069
2600d2dd
SW		 3070static void handle_lease(struct ceph_mds_client *mdsc,
3071 struct ceph_mds_session *session,
3072 struct ceph_msg *msg)
2f2dc053 3073{
3d14c5d2 3074 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 3075 struct inode *inode;
2f2dc053
SW		 3076 struct dentry *parent, *dentry;
3077 struct ceph_dentry_info *di;
2600d2dd 3078 int mds = session->s_mds;
2f2dc053 3079 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 3080 u32 seq;
2f2dc053 3081 struct ceph_vino vino;
2f2dc053
SW		 3082 struct qstr dname;
3083 int release = 0;
3084
2f2dc053
SW		 3085 dout("handle_lease from mds%d\n", mds);
3086
3087 /* decode */
3088 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3089 goto bad;
3090 vino.ino = le64_to_cpu(h->ino);
3091 vino.snap = CEPH_NOSNAP;
1e5ea23d 3092 seq = le32_to_cpu(h->seq);
2f2dc053
SW		 3093 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3094 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3095 if (dname.len != get_unaligned_le32(h+1))
3096 goto bad;
3097
2f2dc053
SW		 3098 /* lookup inode */
3099 inode = ceph_find_inode(sb, vino);
2f90b852
SW		 3100 dout("handle_lease %s, ino %llx %p %.*s\n",
3101 ceph_lease_op_name(h->action), vino.ino, inode,
1e5ea23d 3102 dname.len, dname.name);
6cd3bcad
YZ		 3103
3104 mutex_lock(&session->s_mutex);
3105 session->s_seq++;
3106
2f2dc053
SW		 3107 if (inode == NULL) {
3108 dout("handle_lease no inode %llx\n", vino.ino);
3109 goto release;
3110 }
2f2dc053
SW		 3111
3112 /* dentry */
3113 parent = d_find_alias(inode);
3114 if (!parent) {
3115 dout("no parent dentry on inode %p\n", inode);
3116 WARN_ON(1);
3117 goto release; /* hrm... */
3118 }
3119 dname.hash = full_name_hash(dname.name, dname.len);
3120 dentry = d_lookup(parent, &dname);
3121 dput(parent);
3122 if (!dentry)
3123 goto release;
3124
3125 spin_lock(&dentry->d_lock);
3126 di = ceph_dentry(dentry);
3127 switch (h->action) {
3128 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 3129 if (di->lease_session == session) {
1e5ea23d
SW		 3130 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3131 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 3132 __ceph_mdsc_drop_dentry_lease(dentry);
3133 }
3134 release = 1;
3135 break;
3136
3137 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 3138 if (di->lease_session == session &&
2f2dc053
SW		 3139 di->lease_gen == session->s_cap_gen &&
3140 di->lease_renew_from &&
3141 di->lease_renew_after == 0) {
3142 unsigned long duration =
3143 le32_to_cpu(h->duration_ms) * HZ / 1000;
3144
1e5ea23d 3145 di->lease_seq = seq;
2f2dc053
SW		 3146 dentry->d_time = di->lease_renew_from + duration;
3147 di->lease_renew_after = di->lease_renew_from +
3148 (duration >> 1);
3149 di->lease_renew_from = 0;
3150 }
3151 break;
3152 }
3153 spin_unlock(&dentry->d_lock);
3154 dput(dentry);
3155
3156 if (!release)
3157 goto out;
3158
3159release:
3160 /* let's just reuse the same message */
3161 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3162 ceph_msg_get(msg);
3163 ceph_con_send(&session->s_con, msg);
3164
3165out:
3166 iput(inode);
3167 mutex_unlock(&session->s_mutex);
2f2dc053
SW		 3168 return;
3169
3170bad:
3171 pr_err("corrupt lease message\n");
9ec7cab1 3172 ceph_msg_dump(msg);
2f2dc053
SW		 3173}
3174
3175void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3176 struct inode *inode,
3177 struct dentry *dentry, char action,
3178 u32 seq)
3179{
3180 struct ceph_msg *msg;
3181 struct ceph_mds_lease *lease;
3182 int len = sizeof(*lease) + sizeof(u32);
3183 int dnamelen = 0;
3184
3185 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3186 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3187 dnamelen = dentry->d_name.len;
3188 len += dnamelen;
3189
b61c2763 3190 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 3191 if (!msg)
2f2dc053
SW		 3192 return;
3193 lease = msg->front.iov_base;
3194 lease->action = action;
2f2dc053
SW		 3195 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3196 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3197 lease->seq = cpu_to_le32(seq);
3198 put_unaligned_le32(dnamelen, lease + 1);
3199 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3200
3201 /*
3202 * if this is a preemptive lease RELEASE, no need to
3203 * flush request stream, since the actual request will
3204 * soon follow.
3205 */
3206 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3207
3208 ceph_con_send(&session->s_con, msg);
3209}
3210
3211/*
3212 * Preemptively release a lease we expect to invalidate anyway.
3213 * Pass @inode always, @dentry is optional.
3214 */
3215void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2f90b852 3216 struct dentry *dentry)
2f2dc053
SW		 3217{
3218 struct ceph_dentry_info *di;
3219 struct ceph_mds_session *session;
3220 u32 seq;
3221
3222 BUG_ON(inode == NULL);
3223 BUG_ON(dentry == NULL);
2f2dc053
SW		 3224
3225 /* is dentry lease valid? */
3226 spin_lock(&dentry->d_lock);
3227 di = ceph_dentry(dentry);
3228 if (!di || !di->lease_session ||
3229 di->lease_session->s_mds < 0 ||
3230 di->lease_gen != di->lease_session->s_cap_gen ||
3231 !time_before(jiffies, dentry->d_time)) {
3232 dout("lease_release inode %p dentry %p -- "
2f90b852
SW		 3233 "no lease\n",
3234 inode, dentry);
2f2dc053
SW		 3235 spin_unlock(&dentry->d_lock);
3236 return;
3237 }
3238
3239 /* we do have a lease on this dentry; note mds and seq */
3240 session = ceph_get_mds_session(di->lease_session);
3241 seq = di->lease_seq;
3242 __ceph_mdsc_drop_dentry_lease(dentry);
3243 spin_unlock(&dentry->d_lock);
3244
2f90b852
SW		 3245 dout("lease_release inode %p dentry %p to mds%d\n",
3246 inode, dentry, session->s_mds);
2f2dc053
SW		 3247 ceph_mdsc_lease_send_msg(session, inode, dentry,
3248 CEPH_MDS_LEASE_RELEASE, seq);
3249 ceph_put_mds_session(session);
3250}
3251
3252/*
3253 * drop all leases (and dentry refs) in preparation for umount
3254 */
3255static void drop_leases(struct ceph_mds_client *mdsc)
3256{
3257 int i;
3258
3259 dout("drop_leases\n");
3260 mutex_lock(&mdsc->mutex);
3261 for (i = 0; i < mdsc->max_sessions; i++) {
3262 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3263 if (!s)
3264 continue;
3265 mutex_unlock(&mdsc->mutex);
3266 mutex_lock(&s->s_mutex);
3267 mutex_unlock(&s->s_mutex);
3268 ceph_put_mds_session(s);
3269 mutex_lock(&mdsc->mutex);
3270 }
3271 mutex_unlock(&mdsc->mutex);
3272}
3273
3274
3275
3276/*
3277 * delayed work -- periodically trim expired leases, renew caps with mds
3278 */
3279static void schedule_delayed(struct ceph_mds_client *mdsc)
3280{
3281 int delay = 5;
3282 unsigned hz = round_jiffies_relative(HZ * delay);
3283 schedule_delayed_work(&mdsc->delayed_work, hz);
3284}
3285
3286static void delayed_work(struct work_struct *work)
3287{
3288 int i;
3289 struct ceph_mds_client *mdsc =
3290 container_of(work, struct ceph_mds_client, delayed_work.work);
3291 int renew_interval;
3292 int renew_caps;
3293
3294 dout("mdsc delayed_work\n");
afcdaea3 3295 ceph_check_delayed_caps(mdsc);
2f2dc053
SW		 3296
3297 mutex_lock(&mdsc->mutex);
3298 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3299 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3300 mdsc->last_renew_caps);
3301 if (renew_caps)
3302 mdsc->last_renew_caps = jiffies;
3303
3304 for (i = 0; i < mdsc->max_sessions; i++) {
3305 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3306 if (s == NULL)
3307 continue;
3308 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3309 dout("resending session close request for mds%d\n",
3310 s->s_mds);
3311 request_close_session(mdsc, s);
3312 ceph_put_mds_session(s);
3313 continue;
3314 }
3315 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3316 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3317 s->s_state = CEPH_MDS_SESSION_HUNG;
3318 pr_info("mds%d hung\n", s->s_mds);
3319 }
3320 }
3321 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3322 /* this mds is failed or recovering, just wait */
3323 ceph_put_mds_session(s);
3324 continue;
3325 }
3326 mutex_unlock(&mdsc->mutex);
3327
3328 mutex_lock(&s->s_mutex);
3329 if (renew_caps)
3330 send_renew_caps(mdsc, s);
3331 else
3332 ceph_con_keepalive(&s->s_con);
ee6b272b 3333 ceph_add_cap_releases(mdsc, s);
aab53dd9
SW		 3334 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3335 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 3336 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 3337 mutex_unlock(&s->s_mutex);
3338 ceph_put_mds_session(s);
3339
3340 mutex_lock(&mdsc->mutex);
3341 }
3342 mutex_unlock(&mdsc->mutex);
3343
3344 schedule_delayed(mdsc);
3345}
3346
3d14c5d2 3347int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 3348
2f2dc053 3349{
3d14c5d2
YS		 3350 struct ceph_mds_client *mdsc;
3351
3352 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3353 if (!mdsc)
3354 return -ENOMEM;
3355 mdsc->fsc = fsc;
3356 fsc->mdsc = mdsc;
2f2dc053
SW		 3357 mutex_init(&mdsc->mutex);
3358 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
fb3101b6 3359 if (mdsc->mdsmap == NULL) {
3360 kfree(mdsc);
2d06eeb8 3361 return -ENOMEM;
fb3101b6 3362 }
2d06eeb8 3363
2f2dc053 3364 init_completion(&mdsc->safe_umount_waiters);
f3c60c59 3365 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053
SW		 3366 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3367 mdsc->sessions = NULL;
86d8f67b 3368 atomic_set(&mdsc->num_sessions, 0);
2f2dc053
SW		 3369 mdsc->max_sessions = 0;
3370 mdsc->stopping = 0;
3371 init_rwsem(&mdsc->snap_rwsem);
a105f00c 3372 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 3373 INIT_LIST_HEAD(&mdsc->snap_empty);
3374 spin_lock_init(&mdsc->snap_empty_lock);
3375 mdsc->last_tid = 0;
44ca18f2 3376 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 3377 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3378 mdsc->last_renew_caps = jiffies;
3379 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3380 spin_lock_init(&mdsc->cap_delay_lock);
3381 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3382 spin_lock_init(&mdsc->snap_flush_lock);
3383 mdsc->cap_flush_seq = 0;
3384 INIT_LIST_HEAD(&mdsc->cap_dirty);
db354052 3385 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 3386 mdsc->num_cap_flushing = 0;
3387 spin_lock_init(&mdsc->cap_dirty_lock);
3388 init_waitqueue_head(&mdsc->cap_flushing_wq);
3389 spin_lock_init(&mdsc->dentry_lru_lock);
3390 INIT_LIST_HEAD(&mdsc->dentry_lru);
2d06eeb8 3391
37151668 3392 ceph_caps_init(mdsc);
3d14c5d2 3393 ceph_adjust_min_caps(mdsc, fsc->min_caps);
37151668 3394
5f44f142 3395 return 0;
2f2dc053
SW		 3396}
3397
3398/*
3399 * Wait for safe replies on open mds requests. If we time out, drop
3400 * all requests from the tree to avoid dangling dentry refs.
3401 */
3402static void wait_requests(struct ceph_mds_client *mdsc)
3403{
3404 struct ceph_mds_request *req;
3d14c5d2 3405 struct ceph_fs_client *fsc = mdsc->fsc;
2f2dc053
SW		 3406
3407 mutex_lock(&mdsc->mutex);
44ca18f2 3408 if (__get_oldest_req(mdsc)) {
2f2dc053 3409 mutex_unlock(&mdsc->mutex);
44ca18f2 3410
2f2dc053
SW		 3411 dout("wait_requests waiting for requests\n");
3412 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3d14c5d2 3413 fsc->client->options->mount_timeout * HZ);
2f2dc053
SW		 3414
3415 /* tear down remaining requests */
44ca18f2
SW		 3416 mutex_lock(&mdsc->mutex);
3417 while ((req = __get_oldest_req(mdsc))) {
2f2dc053
SW		 3418 dout("wait_requests timed out on tid %llu\n",
3419 req->r_tid);
44ca18f2 3420 __unregister_request(mdsc, req);
2f2dc053
SW		 3421 }
3422 }
3423 mutex_unlock(&mdsc->mutex);
3424 dout("wait_requests done\n");
3425}
3426
3427/*
3428 * called before mount is ro, and before dentries are torn down.
3429 * (hmm, does this still race with new lookups?)
3430 */
3431void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3432{
3433 dout("pre_umount\n");
3434 mdsc->stopping = 1;
3435
3436 drop_leases(mdsc);
afcdaea3 3437 ceph_flush_dirty_caps(mdsc);
2f2dc053 3438 wait_requests(mdsc);
17c688c3
SW		 3439
3440 /*
3441 * wait for reply handlers to drop their request refs and
3442 * their inode/dcache refs
3443 */
3444 ceph_msgr_flush();
2f2dc053
SW		 3445}
3446
3447/*
3448 * wait for all write mds requests to flush.
3449 */
3450static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3451{
80fc7314 3452 struct ceph_mds_request *req = NULL, *nextreq;
44ca18f2 3453 struct rb_node *n;
2f2dc053
SW		 3454
3455 mutex_lock(&mdsc->mutex);
3456 dout("wait_unsafe_requests want %lld\n", want_tid);
80fc7314 3457restart:
44ca18f2
SW		 3458 req = __get_oldest_req(mdsc);
3459 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 3460 /* find next request */
3461 n = rb_next(&req->r_node);
3462 if (n)
3463 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3464 else
3465 nextreq = NULL;
44ca18f2
SW		 3466 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
3467 /* write op */
3468 ceph_mdsc_get_request(req);
80fc7314
SW		 3469 if (nextreq)
3470 ceph_mdsc_get_request(nextreq);
44ca18f2
SW		 3471 mutex_unlock(&mdsc->mutex);
3472 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3473 req->r_tid, want_tid);
3474 wait_for_completion(&req->r_safe_completion);
3475 mutex_lock(&mdsc->mutex);
44ca18f2 3476 ceph_mdsc_put_request(req);
80fc7314
SW		 3477 if (!nextreq)
3478 break; /* next dne before, so we're done! */
3479 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3480 /* next request was removed from tree */
3481 ceph_mdsc_put_request(nextreq);
3482 goto restart;
3483 }
3484 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 3485 }
80fc7314 3486 req = nextreq;
2f2dc053
SW		 3487 }
3488 mutex_unlock(&mdsc->mutex);
3489 dout("wait_unsafe_requests done\n");
3490}
3491
3492void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3493{
3494 u64 want_tid, want_flush;
3495
3d14c5d2 3496 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 3497 return;
3498
2f2dc053
SW		 3499 dout("sync\n");
3500 mutex_lock(&mdsc->mutex);
3501 want_tid = mdsc->last_tid;
2f2dc053 3502 mutex_unlock(&mdsc->mutex);
2f2dc053 3503
afcdaea3 3504 ceph_flush_dirty_caps(mdsc);
d3383a8e
YZ		 3505 spin_lock(&mdsc->cap_dirty_lock);
3506 want_flush = mdsc->cap_flush_seq;
3507 spin_unlock(&mdsc->cap_dirty_lock);
3508
3509 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
2f2dc053
SW		 3510
3511 wait_unsafe_requests(mdsc, want_tid);
d3383a8e 3512 wait_caps_flush(mdsc, want_flush);
2f2dc053
SW		 3513}
3514
f3c60c59
SW		 3515/*
3516 * true if all sessions are closed, or we force unmount
3517 */
7fd7d101 3518static bool done_closing_sessions(struct ceph_mds_client *mdsc)
f3c60c59 3519{
3d14c5d2 3520 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
f3c60c59 3521 return true;
86d8f67b 3522 return atomic_read(&mdsc->num_sessions) == 0;
f3c60c59 3523}
2f2dc053
SW		 3524
3525/*
3526 * called after sb is ro.
3527 */
3528void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3529{
3530 struct ceph_mds_session *session;
3531 int i;
3d14c5d2
YS		 3532 struct ceph_fs_client *fsc = mdsc->fsc;
3533 unsigned long timeout = fsc->client->options->mount_timeout * HZ;
2f2dc053
SW		 3534
3535 dout("close_sessions\n");
3536
2f2dc053 3537 /* close sessions */
f3c60c59
SW		 3538 mutex_lock(&mdsc->mutex);
3539 for (i = 0; i < mdsc->max_sessions; i++) {
3540 session = __ceph_lookup_mds_session(mdsc, i);
3541 if (!session)
3542 continue;
2f2dc053 3543 mutex_unlock(&mdsc->mutex);
f3c60c59
SW		 3544 mutex_lock(&session->s_mutex);
3545 __close_session(mdsc, session);
3546 mutex_unlock(&session->s_mutex);
3547 ceph_put_mds_session(session);
2f2dc053
SW		 3548 mutex_lock(&mdsc->mutex);
3549 }
f3c60c59
SW		 3550 mutex_unlock(&mdsc->mutex);
3551
3552 dout("waiting for sessions to close\n");
3553 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3554 timeout);
2f2dc053
SW		 3555
3556 /* tear down remaining sessions */
f3c60c59 3557 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 3558 for (i = 0; i < mdsc->max_sessions; i++) {
3559 if (mdsc->sessions[i]) {
3560 session = get_session(mdsc->sessions[i]);
2600d2dd 3561 __unregister_session(mdsc, session);
2f2dc053
SW		 3562 mutex_unlock(&mdsc->mutex);
3563 mutex_lock(&session->s_mutex);
3564 remove_session_caps(session);
3565 mutex_unlock(&session->s_mutex);
3566 ceph_put_mds_session(session);
3567 mutex_lock(&mdsc->mutex);
3568 }
3569 }
2f2dc053 3570 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 3571 mutex_unlock(&mdsc->mutex);
3572
3573 ceph_cleanup_empty_realms(mdsc);
3574
3575 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3576
3577 dout("stopped\n");
3578}
3579
3d14c5d2 3580static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053
SW		 3581{
3582 dout("stop\n");
3583 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3584 if (mdsc->mdsmap)
3585 ceph_mdsmap_destroy(mdsc->mdsmap);
3586 kfree(mdsc->sessions);
37151668 3587 ceph_caps_finalize(mdsc);
2f2dc053
SW		 3588}
3589
3d14c5d2
YS		 3590void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3591{
3592 struct ceph_mds_client *mdsc = fsc->mdsc;
3593
ef550f6f 3594 dout("mdsc_destroy %p\n", mdsc);
3d14c5d2 3595 ceph_mdsc_stop(mdsc);
ef550f6f
SW		 3596
3597 /* flush out any connection work with references to us */
3598 ceph_msgr_flush();
3599
3d14c5d2
YS		 3600 fsc->mdsc = NULL;
3601 kfree(mdsc);
ef550f6f 3602 dout("mdsc_destroy %p done\n", mdsc);
3d14c5d2
YS		 3603}
3604
2f2dc053
SW		 3605
3606/*
3607 * handle mds map update.
3608 */
3609void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3610{
3611 u32 epoch;
3612 u32 maplen;
3613 void *p = msg->front.iov_base;
3614 void *end = p + msg->front.iov_len;
3615 struct ceph_mdsmap *newmap, *oldmap;
3616 struct ceph_fsid fsid;
3617 int err = -EINVAL;
3618
3619 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3620 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 3621 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 3622 return;
c89136ea
SW		 3623 epoch = ceph_decode_32(&p);
3624 maplen = ceph_decode_32(&p);
2f2dc053
SW		 3625 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3626
3627 /* do we need it? */
3d14c5d2 3628 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
2f2dc053
SW		 3629 mutex_lock(&mdsc->mutex);
3630 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3631 dout("handle_map epoch %u <= our %u\n",
3632 epoch, mdsc->mdsmap->m_epoch);
3633 mutex_unlock(&mdsc->mutex);
3634 return;
3635 }
3636
3637 newmap = ceph_mdsmap_decode(&p, end);
3638 if (IS_ERR(newmap)) {
3639 err = PTR_ERR(newmap);
3640 goto bad_unlock;
3641 }
3642
3643 /* swap into place */
3644 if (mdsc->mdsmap) {
3645 oldmap = mdsc->mdsmap;
3646 mdsc->mdsmap = newmap;
3647 check_new_map(mdsc, newmap, oldmap);
3648 ceph_mdsmap_destroy(oldmap);
3649 } else {
3650 mdsc->mdsmap = newmap; /* first mds map */
3651 }
3d14c5d2 3652 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
2f2dc053
SW		 3653
3654 __wake_requests(mdsc, &mdsc->waiting_for_map);
3655
3656 mutex_unlock(&mdsc->mutex);
3657 schedule_delayed(mdsc);
3658 return;
3659
3660bad_unlock:
3661 mutex_unlock(&mdsc->mutex);
3662bad:
3663 pr_err("error decoding mdsmap %d\n", err);
3664 return;
3665}
3666
3667static struct ceph_connection *con_get(struct ceph_connection *con)
3668{
3669 struct ceph_mds_session *s = con->private;
3670
3671 if (get_session(s)) {
2600d2dd 3672 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
2f2dc053
SW		 3673 return con;
3674 }
3675 dout("mdsc con_get %p FAIL\n", s);
3676 return NULL;
3677}
3678
3679static void con_put(struct ceph_connection *con)
3680{
3681 struct ceph_mds_session *s = con->private;
3682
7d8e18a6 3683 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
2f2dc053
SW		 3684 ceph_put_mds_session(s);
3685}
3686
3687/*
3688 * if the client is unresponsive for long enough, the mds will kill
3689 * the session entirely.
3690 */
3691static void peer_reset(struct ceph_connection *con)
3692{
3693 struct ceph_mds_session *s = con->private;
7e70f0ed 3694 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 3695
f3ae1b97 3696 pr_warn("mds%d closed our session\n", s->s_mds);
7e70f0ed 3697 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 3698}
3699
3700static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3701{
3702 struct ceph_mds_session *s = con->private;
3703 struct ceph_mds_client *mdsc = s->s_mdsc;
3704 int type = le16_to_cpu(msg->hdr.type);
3705
2600d2dd
SW		 3706 mutex_lock(&mdsc->mutex);
3707 if (__verify_registered_session(mdsc, s) < 0) {
3708 mutex_unlock(&mdsc->mutex);
3709 goto out;
3710 }
3711 mutex_unlock(&mdsc->mutex);
3712
2f2dc053
SW		 3713 switch (type) {
3714 case CEPH_MSG_MDS_MAP:
3715 ceph_mdsc_handle_map(mdsc, msg);
3716 break;
3717 case CEPH_MSG_CLIENT_SESSION:
3718 handle_session(s, msg);
3719 break;
3720 case CEPH_MSG_CLIENT_REPLY:
3721 handle_reply(s, msg);
3722 break;
3723 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 3724 handle_forward(mdsc, s, msg);
2f2dc053
SW		 3725 break;
3726 case CEPH_MSG_CLIENT_CAPS:
3727 ceph_handle_caps(s, msg);
3728 break;
3729 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 3730 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 3731 break;
3732 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 3733 handle_lease(mdsc, s, msg);
2f2dc053
SW		 3734 break;
3735
3736 default:
3737 pr_err("received unknown message type %d %s\n", type,
3738 ceph_msg_type_name(type));
3739 }
2600d2dd 3740out:
2f2dc053
SW		 3741 ceph_msg_put(msg);
3742}
3743
4e7a5dcd
SW		 3744/*
3745 * authentication
3746 */
a3530df3
AE		 3747
3748/*
3749 * Note: returned pointer is the address of a structure that's
3750 * managed separately. Caller must *not* attempt to free it.
3751 */
3752static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 3753 int *proto, int force_new)
4e7a5dcd
SW		 3754{
3755 struct ceph_mds_session *s = con->private;
3756 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3757 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 3758 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 3759
74f1869f 3760 if (force_new && auth->authorizer) {
27859f97 3761 ceph_auth_destroy_authorizer(ac, auth->authorizer);
74f1869f 3762 auth->authorizer = NULL;
4e7a5dcd 3763 }
27859f97
SW		 3764 if (!auth->authorizer) {
3765 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3766 auth);
0bed9b5c
SW		 3767 if (ret)
3768 return ERR_PTR(ret);
27859f97
SW		 3769 } else {
3770 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3771 auth);
a255651d 3772 if (ret)
a3530df3 3773 return ERR_PTR(ret);
4e7a5dcd 3774 }
4e7a5dcd 3775 *proto = ac->protocol;
74f1869f 3776
a3530df3 3777 return auth;
4e7a5dcd
SW		 3778}
3779
3780
3781static int verify_authorizer_reply(struct ceph_connection *con, int len)
3782{
3783 struct ceph_mds_session *s = con->private;
3784 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3785 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4e7a5dcd 3786
27859f97 3787 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
4e7a5dcd
SW		 3788}
3789
9bd2e6f8
SW		 3790static int invalidate_authorizer(struct ceph_connection *con)
3791{
3792 struct ceph_mds_session *s = con->private;
3793 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3794 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 3795
27859f97 3796 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 3797
3d14c5d2 3798 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 3799}
3800
53ded495
AE		 3801static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3802 struct ceph_msg_header *hdr, int *skip)
3803{
3804 struct ceph_msg *msg;
3805 int type = (int) le16_to_cpu(hdr->type);
3806 int front_len = (int) le32_to_cpu(hdr->front_len);
3807
3808 if (con->in_msg)
3809 return con->in_msg;
3810
3811 *skip = 0;
3812 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3813 if (!msg) {
3814 pr_err("unable to allocate msg type %d len %d\n",
3815 type, front_len);
3816 return NULL;
3817 }
53ded495
AE		 3818
3819 return msg;
3820}
3821
33d07337
YZ		 3822static int sign_message(struct ceph_connection *con, struct ceph_msg *msg)
3823{
3824 struct ceph_mds_session *s = con->private;
3825 struct ceph_auth_handshake *auth = &s->s_auth;
3826 return ceph_auth_sign_message(auth, msg);
3827}
3828
3829static int check_message_signature(struct ceph_connection *con, struct ceph_msg *msg)
3830{
3831 struct ceph_mds_session *s = con->private;
3832 struct ceph_auth_handshake *auth = &s->s_auth;
3833 return ceph_auth_check_message_signature(auth, msg);
3834}
3835
9e32789f 3836static const struct ceph_connection_operations mds_con_ops = {
2f2dc053
SW		 3837 .get = con_get,
3838 .put = con_put,
3839 .dispatch = dispatch,
4e7a5dcd
SW		 3840 .get_authorizer = get_authorizer,
3841 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 3842 .invalidate_authorizer = invalidate_authorizer,
2f2dc053 3843 .peer_reset = peer_reset,
53ded495 3844 .alloc_msg = mds_alloc_msg,
33d07337
YZ		 3845 .sign_message = sign_message,
3846 .check_message_signature = check_message_signature,
2f2dc053
SW		 3847};
3848
2f2dc053 3849/* eof */
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