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VFS: security/: d_inode() annotations
[mirror_ubuntu-bionic-kernel.git] / fs / ceph / mds_client.c
CommitLineData
3d14c5d2 1#include <linux/ceph/ceph_debug.h>
2f2dc053 2
496e5955 3#include <linux/fs.h>
2f2dc053 4#include <linux/wait.h>
5a0e3ad6 5#include <linux/slab.h>
54008399 6#include <linux/gfp.h>
2f2dc053 7#include <linux/sched.h>
3d14c5d2
YS		 8#include <linux/debugfs.h>
9#include <linux/seq_file.h>
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44 * are no longer valid.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,
1856 int mds)
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);
1940 head->num_releases = cpu_to_le16(releases);
1941
b8e69066 1942 /* time stamp */
1f041a89
YZ		 1943 {
1944 struct ceph_timespec ts;
1945 ceph_encode_timespec(&ts, &req->r_stamp);
1946 ceph_encode_copy(&p, &ts, sizeof(ts));
1947 }
b8e69066 1948
2f2dc053
SW		 1949 BUG_ON(p > end);
1950 msg->front.iov_len = p - msg->front.iov_base;
1951 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1952
25e6bae3
YZ		 1953 if (req->r_pagelist) {
1954 struct ceph_pagelist *pagelist = req->r_pagelist;
1955 atomic_inc(&pagelist->refcnt);
1956 ceph_msg_data_add_pagelist(msg, pagelist);
1957 msg->hdr.data_len = cpu_to_le32(pagelist->length);
1958 } else {
1959 msg->hdr.data_len = 0;
ebf18f47 1960 }
02afca6c 1961
2f2dc053
SW		 1962 msg->hdr.data_off = cpu_to_le16(0);
1963
1964out_free2:
1965 if (freepath2)
1966 kfree((char *)path2);
1967out_free1:
1968 if (freepath1)
1969 kfree((char *)path1);
1970out:
1971 return msg;
1972}
1973
1974/*
1975 * called under mdsc->mutex if error, under no mutex if
1976 * success.
1977 */
1978static void complete_request(struct ceph_mds_client *mdsc,
1979 struct ceph_mds_request *req)
1980{
1981 if (req->r_callback)
1982 req->r_callback(mdsc, req);
1983 else
03066f23 1984 complete_all(&req->r_completion);
2f2dc053
SW		 1985}
1986
1987/*
1988 * called under mdsc->mutex
1989 */
1990static int __prepare_send_request(struct ceph_mds_client *mdsc,
1991 struct ceph_mds_request *req,
1992 int mds)
1993{
1994 struct ceph_mds_request_head *rhead;
1995 struct ceph_msg *msg;
1996 int flags = 0;
1997
2f2dc053 1998 req->r_attempts++;
e55b71f8
GF		 1999 if (req->r_inode) {
2000 struct ceph_cap *cap =
2001 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2002
2003 if (cap)
2004 req->r_sent_on_mseq = cap->mseq;
2005 else
2006 req->r_sent_on_mseq = -1;
2007 }
2f2dc053
SW		 2008 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2009 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2010
01a92f17 2011 if (req->r_got_unsafe) {
c5c9a0bf 2012 void *p;
01a92f17
SW		 2013 /*
2014 * Replay. Do not regenerate message (and rebuild
2015 * paths, etc.); just use the original message.
2016 * Rebuilding paths will break for renames because
2017 * d_move mangles the src name.
2018 */
2019 msg = req->r_request;
2020 rhead = msg->front.iov_base;
2021
2022 flags = le32_to_cpu(rhead->flags);
2023 flags |= CEPH_MDS_FLAG_REPLAY;
2024 rhead->flags = cpu_to_le32(flags);
2025
2026 if (req->r_target_inode)
2027 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2028
2029 rhead->num_retry = req->r_attempts - 1;
e979cf50
SW		 2030
2031 /* remove cap/dentry releases from message */
2032 rhead->num_releases = 0;
c5c9a0bf
YZ		 2033
2034 /* time stamp */
2035 p = msg->front.iov_base + req->r_request_release_offset;
1f041a89
YZ		 2036 {
2037 struct ceph_timespec ts;
2038 ceph_encode_timespec(&ts, &req->r_stamp);
2039 ceph_encode_copy(&p, &ts, sizeof(ts));
2040 }
c5c9a0bf
YZ		 2041
2042 msg->front.iov_len = p - msg->front.iov_base;
2043 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 2044 return 0;
2045 }
2046
2f2dc053
SW		 2047 if (req->r_request) {
2048 ceph_msg_put(req->r_request);
2049 req->r_request = NULL;
2050 }
2051 msg = create_request_message(mdsc, req, mds);
2052 if (IS_ERR(msg)) {
e1518c7c 2053 req->r_err = PTR_ERR(msg);
2f2dc053 2054 complete_request(mdsc, req);
a79832f2 2055 return PTR_ERR(msg);
2f2dc053
SW		 2056 }
2057 req->r_request = msg;
2058
2059 rhead = msg->front.iov_base;
2f2dc053
SW		 2060 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2061 if (req->r_got_unsafe)
2062 flags |= CEPH_MDS_FLAG_REPLAY;
2063 if (req->r_locked_dir)
2064 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2065 rhead->flags = cpu_to_le32(flags);
2066 rhead->num_fwd = req->r_num_fwd;
2067 rhead->num_retry = req->r_attempts - 1;
01a92f17 2068 rhead->ino = 0;
2f2dc053
SW		 2069
2070 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2f2dc053
SW		 2071 return 0;
2072}
2073
2074/*
2075 * send request, or put it on the appropriate wait list.
2076 */
2077static int __do_request(struct ceph_mds_client *mdsc,
2078 struct ceph_mds_request *req)
2079{
2080 struct ceph_mds_session *session = NULL;
2081 int mds = -1;
2082 int err = -EAGAIN;
2083
eb1b8af3
YZ		 2084 if (req->r_err || req->r_got_result) {
2085 if (req->r_aborted)
2086 __unregister_request(mdsc, req);
2f2dc053 2087 goto out;
eb1b8af3 2088 }
2f2dc053
SW		 2089
2090 if (req->r_timeout &&
2091 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2092 dout("do_request timed out\n");
2093 err = -EIO;
2094 goto finish;
2095 }
2096
dc69e2e9
SW		 2097 put_request_session(req);
2098
2f2dc053
SW		 2099 mds = __choose_mds(mdsc, req);
2100 if (mds < 0 ||
2101 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2102 dout("do_request no mds or not active, waiting for map\n");
2103 list_add(&req->r_wait, &mdsc->waiting_for_map);
2104 goto out;
2105 }
2106
2107 /* get, open session */
2108 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 2109 if (!session) {
2f2dc053 2110 session = register_session(mdsc, mds);
9c423956
SW		 2111 if (IS_ERR(session)) {
2112 err = PTR_ERR(session);
2113 goto finish;
2114 }
2115 }
dc69e2e9
SW		 2116 req->r_session = get_session(session);
2117
2f2dc053 2118 dout("do_request mds%d session %p state %s\n", mds, session,
a687ecaf 2119 ceph_session_state_name(session->s_state));
2f2dc053
SW		 2120 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2121 session->s_state != CEPH_MDS_SESSION_HUNG) {
2122 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2123 session->s_state == CEPH_MDS_SESSION_CLOSING)
2124 __open_session(mdsc, session);
2125 list_add(&req->r_wait, &session->s_waiting);
2126 goto out_session;
2127 }
2128
2129 /* send request */
2f2dc053
SW		 2130 req->r_resend_mds = -1; /* forget any previous mds hint */
2131
2132 if (req->r_request_started == 0) /* note request start time */
2133 req->r_request_started = jiffies;
2134
2135 err = __prepare_send_request(mdsc, req, mds);
2136 if (!err) {
2137 ceph_msg_get(req->r_request);
2138 ceph_con_send(&session->s_con, req->r_request);
2139 }
2140
2141out_session:
2142 ceph_put_mds_session(session);
2143out:
2144 return err;
2145
2146finish:
e1518c7c 2147 req->r_err = err;
2f2dc053
SW		 2148 complete_request(mdsc, req);
2149 goto out;
2150}
2151
2152/*
2153 * called under mdsc->mutex
2154 */
2155static void __wake_requests(struct ceph_mds_client *mdsc,
2156 struct list_head *head)
2157{
ed75ec2c
YZ		 2158 struct ceph_mds_request *req;
2159 LIST_HEAD(tmp_list);
2160
2161 list_splice_init(head, &tmp_list);
2f2dc053 2162
ed75ec2c
YZ		 2163 while (!list_empty(&tmp_list)) {
2164 req = list_entry(tmp_list.next,
2165 struct ceph_mds_request, r_wait);
2f2dc053 2166 list_del_init(&req->r_wait);
7971bd92 2167 dout(" wake request %p tid %llu\n", req, req->r_tid);
2f2dc053
SW		 2168 __do_request(mdsc, req);
2169 }
2170}
2171
2172/*
2173 * Wake up threads with requests pending for @mds, so that they can
29790f26 2174 * resubmit their requests to a possibly different mds.
2f2dc053 2175 */
29790f26 2176static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 2177{
44ca18f2 2178 struct ceph_mds_request *req;
282c1052 2179 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053
SW		 2180
2181 dout("kick_requests mds%d\n", mds);
282c1052 2182 while (p) {
44ca18f2 2183 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 2184 p = rb_next(p);
44ca18f2
SW		 2185 if (req->r_got_unsafe)
2186 continue;
3de22be6
YZ		 2187 if (req->r_attempts > 0)
2188 continue; /* only new requests */
44ca18f2
SW		 2189 if (req->r_session &&
2190 req->r_session->s_mds == mds) {
2191 dout(" kicking tid %llu\n", req->r_tid);
03974e81 2192 list_del_init(&req->r_wait);
44ca18f2 2193 __do_request(mdsc, req);
2f2dc053
SW		 2194 }
2195 }
2196}
2197
2198void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2199 struct ceph_mds_request *req)
2200{
2201 dout("submit_request on %p\n", req);
2202 mutex_lock(&mdsc->mutex);
2203 __register_request(mdsc, req, NULL);
2204 __do_request(mdsc, req);
2205 mutex_unlock(&mdsc->mutex);
2206}
2207
2208/*
2209 * Synchrously perform an mds request. Take care of all of the
2210 * session setup, forwarding, retry details.
2211 */
2212int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2213 struct inode *dir,
2214 struct ceph_mds_request *req)
2215{
2216 int err;
2217
2218 dout("do_request on %p\n", req);
2219
2220 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2221 if (req->r_inode)
2222 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2223 if (req->r_locked_dir)
2224 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
844d87c3 2225 if (req->r_old_dentry_dir)
41b02e1f
SW		 2226 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2227 CEPH_CAP_PIN);
2f2dc053
SW		 2228
2229 /* issue */
2230 mutex_lock(&mdsc->mutex);
2231 __register_request(mdsc, req, dir);
2232 __do_request(mdsc, req);
2233
e1518c7c
SW		 2234 if (req->r_err) {
2235 err = req->r_err;
2236 __unregister_request(mdsc, req);
2237 dout("do_request early error %d\n", err);
2238 goto out;
2f2dc053
SW		 2239 }
2240
e1518c7c
SW		 2241 /* wait */
2242 mutex_unlock(&mdsc->mutex);
2243 dout("do_request waiting\n");
2244 if (req->r_timeout) {
aa91647c 2245 err = (long)wait_for_completion_killable_timeout(
e1518c7c
SW		 2246 &req->r_completion, req->r_timeout);
2247 if (err == 0)
2248 err = -EIO;
9280be24
YZ		 2249 } else if (req->r_wait_for_completion) {
2250 err = req->r_wait_for_completion(mdsc, req);
e1518c7c 2251 } else {
aa91647c 2252 err = wait_for_completion_killable(&req->r_completion);
e1518c7c
SW		 2253 }
2254 dout("do_request waited, got %d\n", err);
2255 mutex_lock(&mdsc->mutex);
5b1daecd 2256
e1518c7c
SW		 2257 /* only abort if we didn't race with a real reply */
2258 if (req->r_got_result) {
2259 err = le32_to_cpu(req->r_reply_info.head->result);
2260 } else if (err < 0) {
2261 dout("aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 2262
2263 /*
2264 * ensure we aren't running concurrently with
2265 * ceph_fill_trace or ceph_readdir_prepopulate, which
2266 * rely on locks (dir mutex) held by our caller.
2267 */
2268 mutex_lock(&req->r_fill_mutex);
e1518c7c
SW		 2269 req->r_err = err;
2270 req->r_aborted = true;
b4556396 2271 mutex_unlock(&req->r_fill_mutex);
5b1daecd 2272
e1518c7c 2273 if (req->r_locked_dir &&
167c9e35
SW		 2274 (req->r_op & CEPH_MDS_OP_WRITE))
2275 ceph_invalidate_dir_request(req);
2f2dc053 2276 } else {
e1518c7c 2277 err = req->r_err;
2f2dc053 2278 }
2f2dc053 2279
e1518c7c
SW		 2280out:
2281 mutex_unlock(&mdsc->mutex);
2f2dc053
SW		 2282 dout("do_request %p done, result %d\n", req, err);
2283 return err;
2284}
2285
167c9e35 2286/*
2f276c51 2287 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 2288 * namespace request.
2289 */
2290void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2291{
2292 struct inode *inode = req->r_locked_dir;
167c9e35 2293
2f276c51 2294 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
167c9e35 2295
2f276c51 2296 ceph_dir_clear_complete(inode);
167c9e35
SW		 2297 if (req->r_dentry)
2298 ceph_invalidate_dentry_lease(req->r_dentry);
2299 if (req->r_old_dentry)
2300 ceph_invalidate_dentry_lease(req->r_old_dentry);
2301}
2302
2f2dc053
SW		 2303/*
2304 * Handle mds reply.
2305 *
2306 * We take the session mutex and parse and process the reply immediately.
2307 * This preserves the logical ordering of replies, capabilities, etc., sent
2308 * by the MDS as they are applied to our local cache.
2309 */
2310static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2311{
2312 struct ceph_mds_client *mdsc = session->s_mdsc;
2313 struct ceph_mds_request *req;
2314 struct ceph_mds_reply_head *head = msg->front.iov_base;
2315 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
982d6011 2316 struct ceph_snap_realm *realm;
2f2dc053
SW		 2317 u64 tid;
2318 int err, result;
2600d2dd 2319 int mds = session->s_mds;
2f2dc053 2320
2f2dc053
SW		 2321 if (msg->front.iov_len < sizeof(*head)) {
2322 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
9ec7cab1 2323 ceph_msg_dump(msg);
2f2dc053
SW		 2324 return;
2325 }
2326
2327 /* get request, session */
6df058c0 2328 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2329 mutex_lock(&mdsc->mutex);
2330 req = __lookup_request(mdsc, tid);
2331 if (!req) {
2332 dout("handle_reply on unknown tid %llu\n", tid);
2333 mutex_unlock(&mdsc->mutex);
2334 return;
2335 }
2336 dout("handle_reply %p\n", req);
2f2dc053
SW		 2337
2338 /* correct session? */
d96d6049 2339 if (req->r_session != session) {
2f2dc053
SW		 2340 pr_err("mdsc_handle_reply got %llu on session mds%d"
2341 " not mds%d\n", tid, session->s_mds,
2342 req->r_session ? req->r_session->s_mds : -1);
2343 mutex_unlock(&mdsc->mutex);
2344 goto out;
2345 }
2346
2347 /* dup? */
2348 if ((req->r_got_unsafe && !head->safe) ||
2349 (req->r_got_safe && head->safe)) {
f3ae1b97 2350 pr_warn("got a dup %s reply on %llu from mds%d\n",
2f2dc053
SW		 2351 head->safe ? "safe" : "unsafe", tid, mds);
2352 mutex_unlock(&mdsc->mutex);
2353 goto out;
2354 }
85792d0d 2355 if (req->r_got_safe && !head->safe) {
f3ae1b97 2356 pr_warn("got unsafe after safe on %llu from mds%d\n",
85792d0d
SW		 2357 tid, mds);
2358 mutex_unlock(&mdsc->mutex);
2359 goto out;
2360 }
2f2dc053
SW		 2361
2362 result = le32_to_cpu(head->result);
2363
2364 /*
e55b71f8
GF		 2365 * Handle an ESTALE
2366 * if we're not talking to the authority, send to them
2367 * if the authority has changed while we weren't looking,
2368 * send to new authority
2369 * Otherwise we just have to return an ESTALE
2f2dc053
SW		 2370 */
2371 if (result == -ESTALE) {
e55b71f8 2372 dout("got ESTALE on request %llu", req->r_tid);
51da8e8c 2373 req->r_resend_mds = -1;
ca18bede 2374 if (req->r_direct_mode != USE_AUTH_MDS) {
e55b71f8
GF		 2375 dout("not using auth, setting for that now");
2376 req->r_direct_mode = USE_AUTH_MDS;
2f2dc053
SW		 2377 __do_request(mdsc, req);
2378 mutex_unlock(&mdsc->mutex);
2379 goto out;
e55b71f8 2380 } else {
ca18bede
YZ		 2381 int mds = __choose_mds(mdsc, req);
2382 if (mds >= 0 && mds != req->r_session->s_mds) {
2383 dout("but auth changed, so resending");
e55b71f8
GF		 2384 __do_request(mdsc, req);
2385 mutex_unlock(&mdsc->mutex);
2386 goto out;
2387 }
2f2dc053 2388 }
e55b71f8 2389 dout("have to return ESTALE on request %llu", req->r_tid);
2f2dc053
SW		 2390 }
2391
e55b71f8 2392
2f2dc053
SW		 2393 if (head->safe) {
2394 req->r_got_safe = true;
2395 __unregister_request(mdsc, req);
2f2dc053
SW		 2396
2397 if (req->r_got_unsafe) {
2398 /*
2399 * We already handled the unsafe response, now do the
2400 * cleanup. No need to examine the response; the MDS
2401 * doesn't include any result info in the safe
2402 * response. And even if it did, there is nothing
2403 * useful we could do with a revised return value.
2404 */
2405 dout("got safe reply %llu, mds%d\n", tid, mds);
2406 list_del_init(&req->r_unsafe_item);
2407
2408 /* last unsafe request during umount? */
44ca18f2 2409 if (mdsc->stopping && !__get_oldest_req(mdsc))
03066f23 2410 complete_all(&mdsc->safe_umount_waiters);
2f2dc053
SW		 2411 mutex_unlock(&mdsc->mutex);
2412 goto out;
2413 }
e1518c7c 2414 } else {
2f2dc053
SW		 2415 req->r_got_unsafe = true;
2416 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2417 }
2418
2419 dout("handle_reply tid %lld result %d\n", tid, result);
2420 rinfo = &req->r_reply_info;
14303d20 2421 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2f2dc053
SW		 2422 mutex_unlock(&mdsc->mutex);
2423
2424 mutex_lock(&session->s_mutex);
2425 if (err < 0) {
25933abd 2426 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
9ec7cab1 2427 ceph_msg_dump(msg);
2f2dc053
SW		 2428 goto out_err;
2429 }
2430
2431 /* snap trace */
982d6011 2432 realm = NULL;
2f2dc053
SW		 2433 if (rinfo->snapblob_len) {
2434 down_write(&mdsc->snap_rwsem);
2435 ceph_update_snap_trace(mdsc, rinfo->snapblob,
982d6011
YZ		 2436 rinfo->snapblob + rinfo->snapblob_len,
2437 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2438 &realm);
2f2dc053
SW		 2439 downgrade_write(&mdsc->snap_rwsem);
2440 } else {
2441 down_read(&mdsc->snap_rwsem);
2442 }
2443
2444 /* insert trace into our cache */
b4556396 2445 mutex_lock(&req->r_fill_mutex);
3d14c5d2 2446 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2f2dc053 2447 if (err == 0) {
6e8575fa 2448 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 2449 req->r_op == CEPH_MDS_OP_LSSNAP))
2f2dc053 2450 ceph_readdir_prepopulate(req, req->r_session);
37151668 2451 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2f2dc053 2452 }
b4556396 2453 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 2454
2455 up_read(&mdsc->snap_rwsem);
982d6011
YZ		 2456 if (realm)
2457 ceph_put_snap_realm(mdsc, realm);
2f2dc053 2458out_err:
e1518c7c
SW		 2459 mutex_lock(&mdsc->mutex);
2460 if (!req->r_aborted) {
2461 if (err) {
2462 req->r_err = err;
2463 } else {
2464 req->r_reply = msg;
2465 ceph_msg_get(msg);
2466 req->r_got_result = true;
2467 }
2f2dc053 2468 } else {
e1518c7c 2469 dout("reply arrived after request %lld was aborted\n", tid);
2f2dc053 2470 }
e1518c7c 2471 mutex_unlock(&mdsc->mutex);
2f2dc053 2472
ee6b272b 2473 ceph_add_cap_releases(mdsc, req->r_session);
2f2dc053
SW		 2474 mutex_unlock(&session->s_mutex);
2475
2476 /* kick calling process */
2477 complete_request(mdsc, req);
2478out:
2479 ceph_mdsc_put_request(req);
2480 return;
2481}
2482
2483
2484
2485/*
2486 * handle mds notification that our request has been forwarded.
2487 */
2600d2dd
SW		 2488static void handle_forward(struct ceph_mds_client *mdsc,
2489 struct ceph_mds_session *session,
2490 struct ceph_msg *msg)
2f2dc053
SW		 2491{
2492 struct ceph_mds_request *req;
a1ea787c 2493 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2494 u32 next_mds;
2495 u32 fwd_seq;
2f2dc053
SW		 2496 int err = -EINVAL;
2497 void *p = msg->front.iov_base;
2498 void *end = p + msg->front.iov_len;
2f2dc053 2499
a1ea787c 2500 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 2501 next_mds = ceph_decode_32(&p);
2502 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 2503
2504 mutex_lock(&mdsc->mutex);
2505 req = __lookup_request(mdsc, tid);
2506 if (!req) {
2a8e5e36 2507 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2f2dc053
SW		 2508 goto out; /* dup reply? */
2509 }
2510
2a8e5e36
SW		 2511 if (req->r_aborted) {
2512 dout("forward tid %llu aborted, unregistering\n", tid);
2513 __unregister_request(mdsc, req);
2514 } else if (fwd_seq <= req->r_num_fwd) {
2515 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2f2dc053
SW		 2516 tid, next_mds, req->r_num_fwd, fwd_seq);
2517 } else {
2518 /* resend. forward race not possible; mds would drop */
2a8e5e36
SW		 2519 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2520 BUG_ON(req->r_err);
2521 BUG_ON(req->r_got_result);
3de22be6 2522 req->r_attempts = 0;
2f2dc053
SW		 2523 req->r_num_fwd = fwd_seq;
2524 req->r_resend_mds = next_mds;
2525 put_request_session(req);
2526 __do_request(mdsc, req);
2527 }
2528 ceph_mdsc_put_request(req);
2529out:
2530 mutex_unlock(&mdsc->mutex);
2531 return;
2532
2533bad:
2534 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2535}
2536
2537/*
2538 * handle a mds session control message
2539 */
2540static void handle_session(struct ceph_mds_session *session,
2541 struct ceph_msg *msg)
2542{
2543 struct ceph_mds_client *mdsc = session->s_mdsc;
2544 u32 op;
2545 u64 seq;
2600d2dd 2546 int mds = session->s_mds;
2f2dc053
SW		 2547 struct ceph_mds_session_head *h = msg->front.iov_base;
2548 int wake = 0;
2549
2f2dc053
SW		 2550 /* decode */
2551 if (msg->front.iov_len != sizeof(*h))
2552 goto bad;
2553 op = le32_to_cpu(h->op);
2554 seq = le64_to_cpu(h->seq);
2555
2556 mutex_lock(&mdsc->mutex);
2600d2dd
SW		 2557 if (op == CEPH_SESSION_CLOSE)
2558 __unregister_session(mdsc, session);
2f2dc053
SW		 2559 /* FIXME: this ttl calculation is generous */
2560 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2561 mutex_unlock(&mdsc->mutex);
2562
2563 mutex_lock(&session->s_mutex);
2564
2565 dout("handle_session mds%d %s %p state %s seq %llu\n",
2566 mds, ceph_session_op_name(op), session,
a687ecaf 2567 ceph_session_state_name(session->s_state), seq);
2f2dc053
SW		 2568
2569 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2570 session->s_state = CEPH_MDS_SESSION_OPEN;
2571 pr_info("mds%d came back\n", session->s_mds);
2572 }
2573
2574 switch (op) {
2575 case CEPH_SESSION_OPEN:
29790f26
SW		 2576 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2577 pr_info("mds%d reconnect success\n", session->s_mds);
2f2dc053
SW		 2578 session->s_state = CEPH_MDS_SESSION_OPEN;
2579 renewed_caps(mdsc, session, 0);
2580 wake = 1;
2581 if (mdsc->stopping)
2582 __close_session(mdsc, session);
2583 break;
2584
2585 case CEPH_SESSION_RENEWCAPS:
2586 if (session->s_renew_seq == seq)
2587 renewed_caps(mdsc, session, 1);
2588 break;
2589
2590 case CEPH_SESSION_CLOSE:
29790f26
SW		 2591 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2592 pr_info("mds%d reconnect denied\n", session->s_mds);
2f2dc053 2593 remove_session_caps(session);
656e4382 2594 wake = 2; /* for good measure */
f3c60c59 2595 wake_up_all(&mdsc->session_close_wq);
2f2dc053
SW		 2596 break;
2597
2598 case CEPH_SESSION_STALE:
2599 pr_info("mds%d caps went stale, renewing\n",
2600 session->s_mds);
d8fb02ab 2601 spin_lock(&session->s_gen_ttl_lock);
2f2dc053 2602 session->s_cap_gen++;
1ce208a6 2603 session->s_cap_ttl = jiffies - 1;
d8fb02ab 2604 spin_unlock(&session->s_gen_ttl_lock);
2f2dc053
SW		 2605 send_renew_caps(mdsc, session);
2606 break;
2607
2608 case CEPH_SESSION_RECALL_STATE:
2609 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2610 break;
2611
186e4f7a
YZ		 2612 case CEPH_SESSION_FLUSHMSG:
2613 send_flushmsg_ack(mdsc, session, seq);
2614 break;
2615
03f4fcb0
YZ		 2616 case CEPH_SESSION_FORCE_RO:
2617 dout("force_session_readonly %p\n", session);
2618 spin_lock(&session->s_cap_lock);
2619 session->s_readonly = true;
2620 spin_unlock(&session->s_cap_lock);
2621 wake_up_session_caps(session, 0);
2622 break;
2623
2f2dc053
SW		 2624 default:
2625 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2626 WARN_ON(1);
2627 }
2628
2629 mutex_unlock(&session->s_mutex);
2630 if (wake) {
2631 mutex_lock(&mdsc->mutex);
2632 __wake_requests(mdsc, &session->s_waiting);
656e4382
YZ		 2633 if (wake == 2)
2634 kick_requests(mdsc, mds);
2f2dc053
SW		 2635 mutex_unlock(&mdsc->mutex);
2636 }
2637 return;
2638
2639bad:
2640 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2641 (int)msg->front.iov_len);
9ec7cab1 2642 ceph_msg_dump(msg);
2f2dc053
SW		 2643 return;
2644}
2645
2646
2647/*
2648 * called under session->mutex.
2649 */
2650static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2651 struct ceph_mds_session *session)
2652{
2653 struct ceph_mds_request *req, *nreq;
3de22be6 2654 struct rb_node *p;
2f2dc053
SW		 2655 int err;
2656
2657 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2658
2659 mutex_lock(&mdsc->mutex);
2660 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2661 err = __prepare_send_request(mdsc, req, session->s_mds);
2662 if (!err) {
2663 ceph_msg_get(req->r_request);
2664 ceph_con_send(&session->s_con, req->r_request);
2665 }
2666 }
3de22be6
YZ		 2667
2668 /*
2669 * also re-send old requests when MDS enters reconnect stage. So that MDS
2670 * can process completed request in clientreplay stage.
2671 */
2672 p = rb_first(&mdsc->request_tree);
2673 while (p) {
2674 req = rb_entry(p, struct ceph_mds_request, r_node);
2675 p = rb_next(p);
2676 if (req->r_got_unsafe)
2677 continue;
2678 if (req->r_attempts == 0)
2679 continue; /* only old requests */
2680 if (req->r_session &&
2681 req->r_session->s_mds == session->s_mds) {
2682 err = __prepare_send_request(mdsc, req, session->s_mds);
2683 if (!err) {
2684 ceph_msg_get(req->r_request);
2685 ceph_con_send(&session->s_con, req->r_request);
2686 }
2687 }
2688 }
2f2dc053
SW		 2689 mutex_unlock(&mdsc->mutex);
2690}
2691
2692/*
2693 * Encode information about a cap for a reconnect with the MDS.
2694 */
2f2dc053
SW		 2695static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2696 void *arg)
2697{
20cb34ae
SW		 2698 union {
2699 struct ceph_mds_cap_reconnect v2;
2700 struct ceph_mds_cap_reconnect_v1 v1;
2701 } rec;
2702 size_t reclen;
2f2dc053 2703 struct ceph_inode_info *ci;
20cb34ae
SW		 2704 struct ceph_reconnect_state *recon_state = arg;
2705 struct ceph_pagelist *pagelist = recon_state->pagelist;
2f2dc053
SW		 2706 char *path;
2707 int pathlen, err;
2708 u64 pathbase;
2709 struct dentry *dentry;
2710
2711 ci = cap->ci;
2712
2713 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2714 inode, ceph_vinop(inode), cap, cap->cap_id,
2715 ceph_cap_string(cap->issued));
93cea5be
SW		 2716 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2717 if (err)
2718 return err;
2f2dc053
SW		 2719
2720 dentry = d_find_alias(inode);
2721 if (dentry) {
2722 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2723 if (IS_ERR(path)) {
2724 err = PTR_ERR(path);
e072f8aa 2725 goto out_dput;
2f2dc053
SW		 2726 }
2727 } else {
2728 path = NULL;
2729 pathlen = 0;
2730 }
93cea5be
SW		 2731 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2732 if (err)
e072f8aa 2733 goto out_free;
2f2dc053 2734
be655596 2735 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 2736 cap->seq = 0; /* reset cap seq */
2737 cap->issue_seq = 0; /* and issue_seq */
667ca05c 2738 cap->mseq = 0; /* and migrate_seq */
99a9c273 2739 cap->cap_gen = cap->session->s_cap_gen;
20cb34ae
SW		 2740
2741 if (recon_state->flock) {
2742 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2743 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2744 rec.v2.issued = cpu_to_le32(cap->issued);
2745 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2746 rec.v2.pathbase = cpu_to_le64(pathbase);
2747 rec.v2.flock_len = 0;
2748 reclen = sizeof(rec.v2);
2749 } else {
2750 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2751 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2752 rec.v1.issued = cpu_to_le32(cap->issued);
2753 rec.v1.size = cpu_to_le64(inode->i_size);
2754 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2755 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2756 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2757 rec.v1.pathbase = cpu_to_le64(pathbase);
2758 reclen = sizeof(rec.v1);
2759 }
be655596 2760 spin_unlock(&ci->i_ceph_lock);
2f2dc053 2761
40819f6f
GF		 2762 if (recon_state->flock) {
2763 int num_fcntl_locks, num_flock_locks;
39be95e9
JS		 2764 struct ceph_filelock *flocks;
2765
2766encode_again:
39be95e9 2767 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
39be95e9
JS		 2768 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2769 sizeof(struct ceph_filelock), GFP_NOFS);
2770 if (!flocks) {
2771 err = -ENOMEM;
2772 goto out_free;
2773 }
39be95e9
JS		 2774 err = ceph_encode_locks_to_buffer(inode, flocks,
2775 num_fcntl_locks,
2776 num_flock_locks);
39be95e9
JS		 2777 if (err) {
2778 kfree(flocks);
2779 if (err == -ENOSPC)
2780 goto encode_again;
2781 goto out_free;
2782 }
2783 /*
2784 * number of encoded locks is stable, so copy to pagelist
2785 */
2786 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
2787 (num_fcntl_locks+num_flock_locks) *
2788 sizeof(struct ceph_filelock));
2789 err = ceph_pagelist_append(pagelist, &rec, reclen);
2790 if (!err)
2791 err = ceph_locks_to_pagelist(flocks, pagelist,
2792 num_fcntl_locks,
2793 num_flock_locks);
2794 kfree(flocks);
3612abbd
SW		 2795 } else {
2796 err = ceph_pagelist_append(pagelist, &rec, reclen);
40819f6f 2797 }
44c99757
YZ		 2798
2799 recon_state->nr_caps++;
e072f8aa 2800out_free:
2f2dc053 2801 kfree(path);
e072f8aa 2802out_dput:
2f2dc053 2803 dput(dentry);
93cea5be 2804 return err;
2f2dc053
SW		 2805}
2806
2807
2808/*
2809 * If an MDS fails and recovers, clients need to reconnect in order to
2810 * reestablish shared state. This includes all caps issued through
2811 * this session _and_ the snap_realm hierarchy. Because it's not
2812 * clear which snap realms the mds cares about, we send everything we
2813 * know about.. that ensures we'll then get any new info the
2814 * recovering MDS might have.
2815 *
2816 * This is a relatively heavyweight operation, but it's rare.
2817 *
2818 * called with mdsc->mutex held.
2819 */
34b6c855
SW		 2820static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2821 struct ceph_mds_session *session)
2f2dc053 2822{
2f2dc053 2823 struct ceph_msg *reply;
a105f00c 2824 struct rb_node *p;
34b6c855 2825 int mds = session->s_mds;
9abf82b8 2826 int err = -ENOMEM;
44c99757 2827 int s_nr_caps;
93cea5be 2828 struct ceph_pagelist *pagelist;
20cb34ae 2829 struct ceph_reconnect_state recon_state;
2f2dc053 2830
34b6c855 2831 pr_info("mds%d reconnect start\n", mds);
2f2dc053 2832
93cea5be
SW		 2833 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2834 if (!pagelist)
2835 goto fail_nopagelist;
2836 ceph_pagelist_init(pagelist);
2837
b61c2763 2838 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
a79832f2 2839 if (!reply)
93cea5be 2840 goto fail_nomsg;
93cea5be 2841
34b6c855
SW		 2842 mutex_lock(&session->s_mutex);
2843 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2844 session->s_seq = 0;
2f2dc053 2845
2f2dc053 2846 dout("session %p state %s\n", session,
a687ecaf 2847 ceph_session_state_name(session->s_state));
2f2dc053 2848
99a9c273
YZ		 2849 spin_lock(&session->s_gen_ttl_lock);
2850 session->s_cap_gen++;
2851 spin_unlock(&session->s_gen_ttl_lock);
2852
2853 spin_lock(&session->s_cap_lock);
03f4fcb0
YZ		 2854 /* don't know if session is readonly */
2855 session->s_readonly = 0;
99a9c273
YZ		 2856 /*
2857 * notify __ceph_remove_cap() that we are composing cap reconnect.
2858 * If a cap get released before being added to the cap reconnect,
2859 * __ceph_remove_cap() should skip queuing cap release.
2860 */
2861 session->s_cap_reconnect = 1;
e01a5946
SW		 2862 /* drop old cap expires; we're about to reestablish that state */
2863 discard_cap_releases(mdsc, session);
99a9c273 2864 spin_unlock(&session->s_cap_lock);
e01a5946 2865
5d23371f
YZ		 2866 /* trim unused caps to reduce MDS's cache rejoin time */
2867 shrink_dcache_parent(mdsc->fsc->sb->s_root);
2868
2869 ceph_con_close(&session->s_con);
2870 ceph_con_open(&session->s_con,
2871 CEPH_ENTITY_TYPE_MDS, mds,
2872 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2873
2874 /* replay unsafe requests */
2875 replay_unsafe_requests(mdsc, session);
2876
2877 down_read(&mdsc->snap_rwsem);
2878
2f2dc053 2879 /* traverse this session's caps */
44c99757
YZ		 2880 s_nr_caps = session->s_nr_caps;
2881 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
93cea5be
SW		 2882 if (err)
2883 goto fail;
20cb34ae 2884
44c99757 2885 recon_state.nr_caps = 0;
20cb34ae
SW		 2886 recon_state.pagelist = pagelist;
2887 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2888 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2f2dc053 2889 if (err < 0)
9abf82b8 2890 goto fail;
2f2dc053 2891
99a9c273
YZ		 2892 spin_lock(&session->s_cap_lock);
2893 session->s_cap_reconnect = 0;
2894 spin_unlock(&session->s_cap_lock);
2895
2f2dc053
SW		 2896 /*
2897 * snaprealms. we provide mds with the ino, seq (version), and
2898 * parent for all of our realms. If the mds has any newer info,
2899 * it will tell us.
2900 */
a105f00c
SW		 2901 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2902 struct ceph_snap_realm *realm =
2903 rb_entry(p, struct ceph_snap_realm, node);
93cea5be 2904 struct ceph_mds_snaprealm_reconnect sr_rec;
2f2dc053
SW		 2905
2906 dout(" adding snap realm %llx seq %lld parent %llx\n",
2907 realm->ino, realm->seq, realm->parent_ino);
93cea5be
SW		 2908 sr_rec.ino = cpu_to_le64(realm->ino);
2909 sr_rec.seq = cpu_to_le64(realm->seq);
2910 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2911 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2912 if (err)
2913 goto fail;
2f2dc053 2914 }
2f2dc053 2915
20cb34ae
SW		 2916 if (recon_state.flock)
2917 reply->hdr.version = cpu_to_le16(2);
44c99757
YZ		 2918
2919 /* raced with cap release? */
2920 if (s_nr_caps != recon_state.nr_caps) {
2921 struct page *page = list_first_entry(&pagelist->head,
2922 struct page, lru);
2923 __le32 *addr = kmap_atomic(page);
2924 *addr = cpu_to_le32(recon_state.nr_caps);
2925 kunmap_atomic(addr);
ebf18f47 2926 }
44c99757
YZ		 2927
2928 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2929 ceph_msg_data_add_pagelist(reply, pagelist);
2f2dc053
SW		 2930 ceph_con_send(&session->s_con, reply);
2931
9abf82b8
SW		 2932 mutex_unlock(&session->s_mutex);
2933
2934 mutex_lock(&mdsc->mutex);
2935 __wake_requests(mdsc, &session->s_waiting);
2936 mutex_unlock(&mdsc->mutex);
2937
2f2dc053 2938 up_read(&mdsc->snap_rwsem);
2f2dc053
SW		 2939 return;
2940
93cea5be 2941fail:
2f2dc053 2942 ceph_msg_put(reply);
9abf82b8
SW		 2943 up_read(&mdsc->snap_rwsem);
2944 mutex_unlock(&session->s_mutex);
93cea5be
SW		 2945fail_nomsg:
2946 ceph_pagelist_release(pagelist);
93cea5be 2947fail_nopagelist:
9abf82b8 2948 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
9abf82b8 2949 return;
2f2dc053
SW		 2950}
2951
2952
2953/*
2954 * compare old and new mdsmaps, kicking requests
2955 * and closing out old connections as necessary
2956 *
2957 * called under mdsc->mutex.
2958 */
2959static void check_new_map(struct ceph_mds_client *mdsc,
2960 struct ceph_mdsmap *newmap,
2961 struct ceph_mdsmap *oldmap)
2962{
2963 int i;
2964 int oldstate, newstate;
2965 struct ceph_mds_session *s;
2966
2967 dout("check_new_map new %u old %u\n",
2968 newmap->m_epoch, oldmap->m_epoch);
2969
2970 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2971 if (mdsc->sessions[i] == NULL)
2972 continue;
2973 s = mdsc->sessions[i];
2974 oldstate = ceph_mdsmap_get_state(oldmap, i);
2975 newstate = ceph_mdsmap_get_state(newmap, i);
2976
0deb01c9 2977 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2f2dc053 2978 i, ceph_mds_state_name(oldstate),
0deb01c9 2979 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2f2dc053 2980 ceph_mds_state_name(newstate),
0deb01c9 2981 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
a687ecaf 2982 ceph_session_state_name(s->s_state));
2f2dc053 2983
3e8f43a0
YZ		 2984 if (i >= newmap->m_max_mds ||
2985 memcmp(ceph_mdsmap_get_addr(oldmap, i),
2f2dc053
SW		 2986 ceph_mdsmap_get_addr(newmap, i),
2987 sizeof(struct ceph_entity_addr))) {
2988 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2989 /* the session never opened, just close it
2990 * out now */
2991 __wake_requests(mdsc, &s->s_waiting);
2600d2dd 2992 __unregister_session(mdsc, s);
2f2dc053
SW		 2993 } else {
2994 /* just close it */
2995 mutex_unlock(&mdsc->mutex);
2996 mutex_lock(&s->s_mutex);
2997 mutex_lock(&mdsc->mutex);
2998 ceph_con_close(&s->s_con);
2999 mutex_unlock(&s->s_mutex);
3000 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3001 }
2f2dc053
SW		 3002 } else if (oldstate == newstate) {
3003 continue; /* nothing new with this mds */
3004 }
3005
3006 /*
3007 * send reconnect?
3008 */
3009 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 3010 newstate >= CEPH_MDS_STATE_RECONNECT) {
3011 mutex_unlock(&mdsc->mutex);
3012 send_mds_reconnect(mdsc, s);
3013 mutex_lock(&mdsc->mutex);
3014 }
2f2dc053
SW		 3015
3016 /*
29790f26 3017 * kick request on any mds that has gone active.
2f2dc053
SW		 3018 */
3019 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3020 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 3021 if (oldstate != CEPH_MDS_STATE_CREATING &&
3022 oldstate != CEPH_MDS_STATE_STARTING)
3023 pr_info("mds%d recovery completed\n", s->s_mds);
3024 kick_requests(mdsc, i);
2f2dc053 3025 ceph_kick_flushing_caps(mdsc, s);
0dc2570f 3026 wake_up_session_caps(s, 1);
2f2dc053
SW		 3027 }
3028 }
cb170a22
SW		 3029
3030 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
3031 s = mdsc->sessions[i];
3032 if (!s)
3033 continue;
3034 if (!ceph_mdsmap_is_laggy(newmap, i))
3035 continue;
3036 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3037 s->s_state == CEPH_MDS_SESSION_HUNG ||
3038 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3039 dout(" connecting to export targets of laggy mds%d\n",
3040 i);
3041 __open_export_target_sessions(mdsc, s);
3042 }
3043 }
2f2dc053
SW		 3044}
3045
3046
3047
3048/*
3049 * leases
3050 */
3051
3052/*
3053 * caller must hold session s_mutex, dentry->d_lock
3054 */
3055void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3056{
3057 struct ceph_dentry_info *di = ceph_dentry(dentry);
3058
3059 ceph_put_mds_session(di->lease_session);
3060 di->lease_session = NULL;
3061}
3062
2600d2dd
SW		 3063static void handle_lease(struct ceph_mds_client *mdsc,
3064 struct ceph_mds_session *session,
3065 struct ceph_msg *msg)
2f2dc053 3066{
3d14c5d2 3067 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 3068 struct inode *inode;
2f2dc053
SW		 3069 struct dentry *parent, *dentry;
3070 struct ceph_dentry_info *di;
2600d2dd 3071 int mds = session->s_mds;
2f2dc053 3072 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 3073 u32 seq;
2f2dc053 3074 struct ceph_vino vino;
2f2dc053
SW		 3075 struct qstr dname;
3076 int release = 0;
3077
2f2dc053
SW		 3078 dout("handle_lease from mds%d\n", mds);
3079
3080 /* decode */
3081 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3082 goto bad;
3083 vino.ino = le64_to_cpu(h->ino);
3084 vino.snap = CEPH_NOSNAP;
1e5ea23d 3085 seq = le32_to_cpu(h->seq);
2f2dc053
SW		 3086 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3087 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3088 if (dname.len != get_unaligned_le32(h+1))
3089 goto bad;
3090
2f2dc053
SW		 3091 /* lookup inode */
3092 inode = ceph_find_inode(sb, vino);
2f90b852
SW		 3093 dout("handle_lease %s, ino %llx %p %.*s\n",
3094 ceph_lease_op_name(h->action), vino.ino, inode,
1e5ea23d 3095 dname.len, dname.name);
6cd3bcad
YZ		 3096
3097 mutex_lock(&session->s_mutex);
3098 session->s_seq++;
3099
2f2dc053
SW		 3100 if (inode == NULL) {
3101 dout("handle_lease no inode %llx\n", vino.ino);
3102 goto release;
3103 }
2f2dc053
SW		 3104
3105 /* dentry */
3106 parent = d_find_alias(inode);
3107 if (!parent) {
3108 dout("no parent dentry on inode %p\n", inode);
3109 WARN_ON(1);
3110 goto release; /* hrm... */
3111 }
3112 dname.hash = full_name_hash(dname.name, dname.len);
3113 dentry = d_lookup(parent, &dname);
3114 dput(parent);
3115 if (!dentry)
3116 goto release;
3117
3118 spin_lock(&dentry->d_lock);
3119 di = ceph_dentry(dentry);
3120 switch (h->action) {
3121 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 3122 if (di->lease_session == session) {
1e5ea23d
SW		 3123 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3124 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 3125 __ceph_mdsc_drop_dentry_lease(dentry);
3126 }
3127 release = 1;
3128 break;
3129
3130 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 3131 if (di->lease_session == session &&
2f2dc053
SW		 3132 di->lease_gen == session->s_cap_gen &&
3133 di->lease_renew_from &&
3134 di->lease_renew_after == 0) {
3135 unsigned long duration =
3136 le32_to_cpu(h->duration_ms) * HZ / 1000;
3137
1e5ea23d 3138 di->lease_seq = seq;
2f2dc053
SW		 3139 dentry->d_time = di->lease_renew_from + duration;
3140 di->lease_renew_after = di->lease_renew_from +
3141 (duration >> 1);
3142 di->lease_renew_from = 0;
3143 }
3144 break;
3145 }
3146 spin_unlock(&dentry->d_lock);
3147 dput(dentry);
3148
3149 if (!release)
3150 goto out;
3151
3152release:
3153 /* let's just reuse the same message */
3154 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3155 ceph_msg_get(msg);
3156 ceph_con_send(&session->s_con, msg);
3157
3158out:
3159 iput(inode);
3160 mutex_unlock(&session->s_mutex);
2f2dc053
SW		 3161 return;
3162
3163bad:
3164 pr_err("corrupt lease message\n");
9ec7cab1 3165 ceph_msg_dump(msg);
2f2dc053
SW		 3166}
3167
3168void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3169 struct inode *inode,
3170 struct dentry *dentry, char action,
3171 u32 seq)
3172{
3173 struct ceph_msg *msg;
3174 struct ceph_mds_lease *lease;
3175 int len = sizeof(*lease) + sizeof(u32);
3176 int dnamelen = 0;
3177
3178 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3179 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3180 dnamelen = dentry->d_name.len;
3181 len += dnamelen;
3182
b61c2763 3183 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 3184 if (!msg)
2f2dc053
SW		 3185 return;
3186 lease = msg->front.iov_base;
3187 lease->action = action;
2f2dc053
SW		 3188 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3189 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3190 lease->seq = cpu_to_le32(seq);
3191 put_unaligned_le32(dnamelen, lease + 1);
3192 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3193
3194 /*
3195 * if this is a preemptive lease RELEASE, no need to
3196 * flush request stream, since the actual request will
3197 * soon follow.
3198 */
3199 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3200
3201 ceph_con_send(&session->s_con, msg);
3202}
3203
3204/*
3205 * Preemptively release a lease we expect to invalidate anyway.
3206 * Pass @inode always, @dentry is optional.
3207 */
3208void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2f90b852 3209 struct dentry *dentry)
2f2dc053
SW		 3210{
3211 struct ceph_dentry_info *di;
3212 struct ceph_mds_session *session;
3213 u32 seq;
3214
3215 BUG_ON(inode == NULL);
3216 BUG_ON(dentry == NULL);
2f2dc053
SW		 3217
3218 /* is dentry lease valid? */
3219 spin_lock(&dentry->d_lock);
3220 di = ceph_dentry(dentry);
3221 if (!di || !di->lease_session ||
3222 di->lease_session->s_mds < 0 ||
3223 di->lease_gen != di->lease_session->s_cap_gen ||
3224 !time_before(jiffies, dentry->d_time)) {
3225 dout("lease_release inode %p dentry %p -- "
2f90b852
SW		 3226 "no lease\n",
3227 inode, dentry);
2f2dc053
SW		 3228 spin_unlock(&dentry->d_lock);
3229 return;
3230 }
3231
3232 /* we do have a lease on this dentry; note mds and seq */
3233 session = ceph_get_mds_session(di->lease_session);
3234 seq = di->lease_seq;
3235 __ceph_mdsc_drop_dentry_lease(dentry);
3236 spin_unlock(&dentry->d_lock);
3237
2f90b852
SW		 3238 dout("lease_release inode %p dentry %p to mds%d\n",
3239 inode, dentry, session->s_mds);
2f2dc053
SW		 3240 ceph_mdsc_lease_send_msg(session, inode, dentry,
3241 CEPH_MDS_LEASE_RELEASE, seq);
3242 ceph_put_mds_session(session);
3243}
3244
3245/*
3246 * drop all leases (and dentry refs) in preparation for umount
3247 */
3248static void drop_leases(struct ceph_mds_client *mdsc)
3249{
3250 int i;
3251
3252 dout("drop_leases\n");
3253 mutex_lock(&mdsc->mutex);
3254 for (i = 0; i < mdsc->max_sessions; i++) {
3255 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3256 if (!s)
3257 continue;
3258 mutex_unlock(&mdsc->mutex);
3259 mutex_lock(&s->s_mutex);
3260 mutex_unlock(&s->s_mutex);
3261 ceph_put_mds_session(s);
3262 mutex_lock(&mdsc->mutex);
3263 }
3264 mutex_unlock(&mdsc->mutex);
3265}
3266
3267
3268
3269/*
3270 * delayed work -- periodically trim expired leases, renew caps with mds
3271 */
3272static void schedule_delayed(struct ceph_mds_client *mdsc)
3273{
3274 int delay = 5;
3275 unsigned hz = round_jiffies_relative(HZ * delay);
3276 schedule_delayed_work(&mdsc->delayed_work, hz);
3277}
3278
3279static void delayed_work(struct work_struct *work)
3280{
3281 int i;
3282 struct ceph_mds_client *mdsc =
3283 container_of(work, struct ceph_mds_client, delayed_work.work);
3284 int renew_interval;
3285 int renew_caps;
3286
3287 dout("mdsc delayed_work\n");
afcdaea3 3288 ceph_check_delayed_caps(mdsc);
2f2dc053
SW		 3289
3290 mutex_lock(&mdsc->mutex);
3291 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3292 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3293 mdsc->last_renew_caps);
3294 if (renew_caps)
3295 mdsc->last_renew_caps = jiffies;
3296
3297 for (i = 0; i < mdsc->max_sessions; i++) {
3298 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3299 if (s == NULL)
3300 continue;
3301 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3302 dout("resending session close request for mds%d\n",
3303 s->s_mds);
3304 request_close_session(mdsc, s);
3305 ceph_put_mds_session(s);
3306 continue;
3307 }
3308 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3309 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3310 s->s_state = CEPH_MDS_SESSION_HUNG;
3311 pr_info("mds%d hung\n", s->s_mds);
3312 }
3313 }
3314 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3315 /* this mds is failed or recovering, just wait */
3316 ceph_put_mds_session(s);
3317 continue;
3318 }
3319 mutex_unlock(&mdsc->mutex);
3320
3321 mutex_lock(&s->s_mutex);
3322 if (renew_caps)
3323 send_renew_caps(mdsc, s);
3324 else
3325 ceph_con_keepalive(&s->s_con);
ee6b272b 3326 ceph_add_cap_releases(mdsc, s);
aab53dd9
SW		 3327 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3328 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 3329 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 3330 mutex_unlock(&s->s_mutex);
3331 ceph_put_mds_session(s);
3332
3333 mutex_lock(&mdsc->mutex);
3334 }
3335 mutex_unlock(&mdsc->mutex);
3336
3337 schedule_delayed(mdsc);
3338}
3339
3d14c5d2 3340int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 3341
2f2dc053 3342{
3d14c5d2
YS		 3343 struct ceph_mds_client *mdsc;
3344
3345 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3346 if (!mdsc)
3347 return -ENOMEM;
3348 mdsc->fsc = fsc;
3349 fsc->mdsc = mdsc;
2f2dc053
SW		 3350 mutex_init(&mdsc->mutex);
3351 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
fb3101b6 3352 if (mdsc->mdsmap == NULL) {
3353 kfree(mdsc);
2d06eeb8 3354 return -ENOMEM;
fb3101b6 3355 }
2d06eeb8 3356
2f2dc053 3357 init_completion(&mdsc->safe_umount_waiters);
f3c60c59 3358 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053
SW		 3359 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3360 mdsc->sessions = NULL;
86d8f67b 3361 atomic_set(&mdsc->num_sessions, 0);
2f2dc053
SW		 3362 mdsc->max_sessions = 0;
3363 mdsc->stopping = 0;
3364 init_rwsem(&mdsc->snap_rwsem);
a105f00c 3365 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 3366 INIT_LIST_HEAD(&mdsc->snap_empty);
3367 spin_lock_init(&mdsc->snap_empty_lock);
3368 mdsc->last_tid = 0;
44ca18f2 3369 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 3370 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3371 mdsc->last_renew_caps = jiffies;
3372 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3373 spin_lock_init(&mdsc->cap_delay_lock);
3374 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3375 spin_lock_init(&mdsc->snap_flush_lock);
3376 mdsc->cap_flush_seq = 0;
3377 INIT_LIST_HEAD(&mdsc->cap_dirty);
db354052 3378 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 3379 mdsc->num_cap_flushing = 0;
3380 spin_lock_init(&mdsc->cap_dirty_lock);
3381 init_waitqueue_head(&mdsc->cap_flushing_wq);
3382 spin_lock_init(&mdsc->dentry_lru_lock);
3383 INIT_LIST_HEAD(&mdsc->dentry_lru);
2d06eeb8 3384
37151668 3385 ceph_caps_init(mdsc);
3d14c5d2 3386 ceph_adjust_min_caps(mdsc, fsc->min_caps);
37151668 3387
5f44f142 3388 return 0;
2f2dc053
SW		 3389}
3390
3391/*
3392 * Wait for safe replies on open mds requests. If we time out, drop
3393 * all requests from the tree to avoid dangling dentry refs.
3394 */
3395static void wait_requests(struct ceph_mds_client *mdsc)
3396{
3397 struct ceph_mds_request *req;
3d14c5d2 3398 struct ceph_fs_client *fsc = mdsc->fsc;
2f2dc053
SW		 3399
3400 mutex_lock(&mdsc->mutex);
44ca18f2 3401 if (__get_oldest_req(mdsc)) {
2f2dc053 3402 mutex_unlock(&mdsc->mutex);
44ca18f2 3403
2f2dc053
SW		 3404 dout("wait_requests waiting for requests\n");
3405 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3d14c5d2 3406 fsc->client->options->mount_timeout * HZ);
2f2dc053
SW		 3407
3408 /* tear down remaining requests */
44ca18f2
SW		 3409 mutex_lock(&mdsc->mutex);
3410 while ((req = __get_oldest_req(mdsc))) {
2f2dc053
SW		 3411 dout("wait_requests timed out on tid %llu\n",
3412 req->r_tid);
44ca18f2 3413 __unregister_request(mdsc, req);
2f2dc053
SW		 3414 }
3415 }
3416 mutex_unlock(&mdsc->mutex);
3417 dout("wait_requests done\n");
3418}
3419
3420/*
3421 * called before mount is ro, and before dentries are torn down.
3422 * (hmm, does this still race with new lookups?)
3423 */
3424void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3425{
3426 dout("pre_umount\n");
3427 mdsc->stopping = 1;
3428
3429 drop_leases(mdsc);
afcdaea3 3430 ceph_flush_dirty_caps(mdsc);
2f2dc053 3431 wait_requests(mdsc);
17c688c3
SW		 3432
3433 /*
3434 * wait for reply handlers to drop their request refs and
3435 * their inode/dcache refs
3436 */
3437 ceph_msgr_flush();
2f2dc053
SW		 3438}
3439
3440/*
3441 * wait for all write mds requests to flush.
3442 */
3443static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3444{
80fc7314 3445 struct ceph_mds_request *req = NULL, *nextreq;
44ca18f2 3446 struct rb_node *n;
2f2dc053
SW		 3447
3448 mutex_lock(&mdsc->mutex);
3449 dout("wait_unsafe_requests want %lld\n", want_tid);
80fc7314 3450restart:
44ca18f2
SW		 3451 req = __get_oldest_req(mdsc);
3452 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 3453 /* find next request */
3454 n = rb_next(&req->r_node);
3455 if (n)
3456 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3457 else
3458 nextreq = NULL;
44ca18f2
SW		 3459 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
3460 /* write op */
3461 ceph_mdsc_get_request(req);
80fc7314
SW		 3462 if (nextreq)
3463 ceph_mdsc_get_request(nextreq);
44ca18f2
SW		 3464 mutex_unlock(&mdsc->mutex);
3465 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3466 req->r_tid, want_tid);
3467 wait_for_completion(&req->r_safe_completion);
3468 mutex_lock(&mdsc->mutex);
44ca18f2 3469 ceph_mdsc_put_request(req);
80fc7314
SW		 3470 if (!nextreq)
3471 break; /* next dne before, so we're done! */
3472 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3473 /* next request was removed from tree */
3474 ceph_mdsc_put_request(nextreq);
3475 goto restart;
3476 }
3477 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 3478 }
80fc7314 3479 req = nextreq;
2f2dc053
SW		 3480 }
3481 mutex_unlock(&mdsc->mutex);
3482 dout("wait_unsafe_requests done\n");
3483}
3484
3485void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3486{
3487 u64 want_tid, want_flush;
3488
3d14c5d2 3489 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 3490 return;
3491
2f2dc053
SW		 3492 dout("sync\n");
3493 mutex_lock(&mdsc->mutex);
3494 want_tid = mdsc->last_tid;
2f2dc053 3495 mutex_unlock(&mdsc->mutex);
2f2dc053 3496
afcdaea3 3497 ceph_flush_dirty_caps(mdsc);
d3383a8e
YZ		 3498 spin_lock(&mdsc->cap_dirty_lock);
3499 want_flush = mdsc->cap_flush_seq;
3500 spin_unlock(&mdsc->cap_dirty_lock);
3501
3502 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
2f2dc053
SW		 3503
3504 wait_unsafe_requests(mdsc, want_tid);
d3383a8e 3505 wait_caps_flush(mdsc, want_flush);
2f2dc053
SW		 3506}
3507
f3c60c59
SW		 3508/*
3509 * true if all sessions are closed, or we force unmount
3510 */
7fd7d101 3511static bool done_closing_sessions(struct ceph_mds_client *mdsc)
f3c60c59 3512{
3d14c5d2 3513 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
f3c60c59 3514 return true;
86d8f67b 3515 return atomic_read(&mdsc->num_sessions) == 0;
f3c60c59 3516}
2f2dc053
SW		 3517
3518/*
3519 * called after sb is ro.
3520 */
3521void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3522{
3523 struct ceph_mds_session *session;
3524 int i;
3d14c5d2
YS		 3525 struct ceph_fs_client *fsc = mdsc->fsc;
3526 unsigned long timeout = fsc->client->options->mount_timeout * HZ;
2f2dc053
SW		 3527
3528 dout("close_sessions\n");
3529
2f2dc053 3530 /* close sessions */
f3c60c59
SW		 3531 mutex_lock(&mdsc->mutex);
3532 for (i = 0; i < mdsc->max_sessions; i++) {
3533 session = __ceph_lookup_mds_session(mdsc, i);
3534 if (!session)
3535 continue;
2f2dc053 3536 mutex_unlock(&mdsc->mutex);
f3c60c59
SW		 3537 mutex_lock(&session->s_mutex);
3538 __close_session(mdsc, session);
3539 mutex_unlock(&session->s_mutex);
3540 ceph_put_mds_session(session);
2f2dc053
SW		 3541 mutex_lock(&mdsc->mutex);
3542 }
f3c60c59
SW		 3543 mutex_unlock(&mdsc->mutex);
3544
3545 dout("waiting for sessions to close\n");
3546 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3547 timeout);
2f2dc053
SW		 3548
3549 /* tear down remaining sessions */
f3c60c59 3550 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 3551 for (i = 0; i < mdsc->max_sessions; i++) {
3552 if (mdsc->sessions[i]) {
3553 session = get_session(mdsc->sessions[i]);
2600d2dd 3554 __unregister_session(mdsc, session);
2f2dc053
SW		 3555 mutex_unlock(&mdsc->mutex);
3556 mutex_lock(&session->s_mutex);
3557 remove_session_caps(session);
3558 mutex_unlock(&session->s_mutex);
3559 ceph_put_mds_session(session);
3560 mutex_lock(&mdsc->mutex);
3561 }
3562 }
2f2dc053 3563 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 3564 mutex_unlock(&mdsc->mutex);
3565
3566 ceph_cleanup_empty_realms(mdsc);
3567
3568 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3569
3570 dout("stopped\n");
3571}
3572
3d14c5d2 3573static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053
SW		 3574{
3575 dout("stop\n");
3576 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3577 if (mdsc->mdsmap)
3578 ceph_mdsmap_destroy(mdsc->mdsmap);
3579 kfree(mdsc->sessions);
37151668 3580 ceph_caps_finalize(mdsc);
2f2dc053
SW		 3581}
3582
3d14c5d2
YS		 3583void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3584{
3585 struct ceph_mds_client *mdsc = fsc->mdsc;
3586
ef550f6f 3587 dout("mdsc_destroy %p\n", mdsc);
3d14c5d2 3588 ceph_mdsc_stop(mdsc);
ef550f6f
SW		 3589
3590 /* flush out any connection work with references to us */
3591 ceph_msgr_flush();
3592
3d14c5d2
YS		 3593 fsc->mdsc = NULL;
3594 kfree(mdsc);
ef550f6f 3595 dout("mdsc_destroy %p done\n", mdsc);
3d14c5d2
YS		 3596}
3597
2f2dc053
SW		 3598
3599/*
3600 * handle mds map update.
3601 */
3602void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3603{
3604 u32 epoch;
3605 u32 maplen;
3606 void *p = msg->front.iov_base;
3607 void *end = p + msg->front.iov_len;
3608 struct ceph_mdsmap *newmap, *oldmap;
3609 struct ceph_fsid fsid;
3610 int err = -EINVAL;
3611
3612 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3613 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 3614 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 3615 return;
c89136ea
SW		 3616 epoch = ceph_decode_32(&p);
3617 maplen = ceph_decode_32(&p);
2f2dc053
SW		 3618 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3619
3620 /* do we need it? */
3d14c5d2 3621 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
2f2dc053
SW		 3622 mutex_lock(&mdsc->mutex);
3623 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3624 dout("handle_map epoch %u <= our %u\n",
3625 epoch, mdsc->mdsmap->m_epoch);
3626 mutex_unlock(&mdsc->mutex);
3627 return;
3628 }
3629
3630 newmap = ceph_mdsmap_decode(&p, end);
3631 if (IS_ERR(newmap)) {
3632 err = PTR_ERR(newmap);
3633 goto bad_unlock;
3634 }
3635
3636 /* swap into place */
3637 if (mdsc->mdsmap) {
3638 oldmap = mdsc->mdsmap;
3639 mdsc->mdsmap = newmap;
3640 check_new_map(mdsc, newmap, oldmap);
3641 ceph_mdsmap_destroy(oldmap);
3642 } else {
3643 mdsc->mdsmap = newmap; /* first mds map */
3644 }
3d14c5d2 3645 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
2f2dc053
SW		 3646
3647 __wake_requests(mdsc, &mdsc->waiting_for_map);
3648
3649 mutex_unlock(&mdsc->mutex);
3650 schedule_delayed(mdsc);
3651 return;
3652
3653bad_unlock:
3654 mutex_unlock(&mdsc->mutex);
3655bad:
3656 pr_err("error decoding mdsmap %d\n", err);
3657 return;
3658}
3659
3660static struct ceph_connection *con_get(struct ceph_connection *con)
3661{
3662 struct ceph_mds_session *s = con->private;
3663
3664 if (get_session(s)) {
2600d2dd 3665 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
2f2dc053
SW		 3666 return con;
3667 }
3668 dout("mdsc con_get %p FAIL\n", s);
3669 return NULL;
3670}
3671
3672static void con_put(struct ceph_connection *con)
3673{
3674 struct ceph_mds_session *s = con->private;
3675
7d8e18a6 3676 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
2f2dc053
SW		 3677 ceph_put_mds_session(s);
3678}
3679
3680/*
3681 * if the client is unresponsive for long enough, the mds will kill
3682 * the session entirely.
3683 */
3684static void peer_reset(struct ceph_connection *con)
3685{
3686 struct ceph_mds_session *s = con->private;
7e70f0ed 3687 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 3688
f3ae1b97 3689 pr_warn("mds%d closed our session\n", s->s_mds);
7e70f0ed 3690 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 3691}
3692
3693static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3694{
3695 struct ceph_mds_session *s = con->private;
3696 struct ceph_mds_client *mdsc = s->s_mdsc;
3697 int type = le16_to_cpu(msg->hdr.type);
3698
2600d2dd
SW		 3699 mutex_lock(&mdsc->mutex);
3700 if (__verify_registered_session(mdsc, s) < 0) {
3701 mutex_unlock(&mdsc->mutex);
3702 goto out;
3703 }
3704 mutex_unlock(&mdsc->mutex);
3705
2f2dc053
SW		 3706 switch (type) {
3707 case CEPH_MSG_MDS_MAP:
3708 ceph_mdsc_handle_map(mdsc, msg);
3709 break;
3710 case CEPH_MSG_CLIENT_SESSION:
3711 handle_session(s, msg);
3712 break;
3713 case CEPH_MSG_CLIENT_REPLY:
3714 handle_reply(s, msg);
3715 break;
3716 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 3717 handle_forward(mdsc, s, msg);
2f2dc053
SW		 3718 break;
3719 case CEPH_MSG_CLIENT_CAPS:
3720 ceph_handle_caps(s, msg);
3721 break;
3722 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 3723 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 3724 break;
3725 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 3726 handle_lease(mdsc, s, msg);
2f2dc053
SW		 3727 break;
3728
3729 default:
3730 pr_err("received unknown message type %d %s\n", type,
3731 ceph_msg_type_name(type));
3732 }
2600d2dd 3733out:
2f2dc053
SW		 3734 ceph_msg_put(msg);
3735}
3736
4e7a5dcd
SW		 3737/*
3738 * authentication
3739 */
a3530df3
AE		 3740
3741/*
3742 * Note: returned pointer is the address of a structure that's
3743 * managed separately. Caller must *not* attempt to free it.
3744 */
3745static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 3746 int *proto, int force_new)
4e7a5dcd
SW		 3747{
3748 struct ceph_mds_session *s = con->private;
3749 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3750 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 3751 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 3752
74f1869f 3753 if (force_new && auth->authorizer) {
27859f97 3754 ceph_auth_destroy_authorizer(ac, auth->authorizer);
74f1869f 3755 auth->authorizer = NULL;
4e7a5dcd 3756 }
27859f97
SW		 3757 if (!auth->authorizer) {
3758 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3759 auth);
0bed9b5c
SW		 3760 if (ret)
3761 return ERR_PTR(ret);
27859f97
SW		 3762 } else {
3763 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3764 auth);
a255651d 3765 if (ret)
a3530df3 3766 return ERR_PTR(ret);
4e7a5dcd 3767 }
4e7a5dcd 3768 *proto = ac->protocol;
74f1869f 3769
a3530df3 3770 return auth;
4e7a5dcd
SW		 3771}
3772
3773
3774static int verify_authorizer_reply(struct ceph_connection *con, int len)
3775{
3776 struct ceph_mds_session *s = con->private;
3777 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3778 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4e7a5dcd 3779
27859f97 3780 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
4e7a5dcd
SW		 3781}
3782
9bd2e6f8
SW		 3783static int invalidate_authorizer(struct ceph_connection *con)
3784{
3785 struct ceph_mds_session *s = con->private;
3786 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3787 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 3788
27859f97 3789 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 3790
3d14c5d2 3791 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 3792}
3793
53ded495
AE		 3794static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3795 struct ceph_msg_header *hdr, int *skip)
3796{
3797 struct ceph_msg *msg;
3798 int type = (int) le16_to_cpu(hdr->type);
3799 int front_len = (int) le32_to_cpu(hdr->front_len);
3800
3801 if (con->in_msg)
3802 return con->in_msg;
3803
3804 *skip = 0;
3805 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3806 if (!msg) {
3807 pr_err("unable to allocate msg type %d len %d\n",
3808 type, front_len);
3809 return NULL;
3810 }
53ded495
AE		 3811
3812 return msg;
3813}
3814
33d07337
YZ		 3815static int sign_message(struct ceph_connection *con, struct ceph_msg *msg)
3816{
3817 struct ceph_mds_session *s = con->private;
3818 struct ceph_auth_handshake *auth = &s->s_auth;
3819 return ceph_auth_sign_message(auth, msg);
3820}
3821
3822static int check_message_signature(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_check_message_signature(auth, msg);
3827}
3828
9e32789f 3829static const struct ceph_connection_operations mds_con_ops = {
2f2dc053
SW		 3830 .get = con_get,
3831 .put = con_put,
3832 .dispatch = dispatch,
4e7a5dcd
SW		 3833 .get_authorizer = get_authorizer,
3834 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 3835 .invalidate_authorizer = invalidate_authorizer,
2f2dc053 3836 .peer_reset = peer_reset,
53ded495 3837 .alloc_msg = mds_alloc_msg,
33d07337
YZ		 3838 .sign_message = sign_message,
3839 .check_message_signature = check_message_signature,
2f2dc053
SW		 3840};
3841
2f2dc053 3842/* eof */
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