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Sage Weil2f2dc052009-10-06 11:31:09 -07001#include "ceph_debug.h"
2
3#include <linux/wait.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09004#include <linux/slab.h>
Sage Weil2f2dc052009-10-06 11:31:09 -07005#include <linux/sched.h>
6
7#include "mds_client.h"
8#include "mon_client.h"
9#include "super.h"
10#include "messenger.h"
11#include "decode.h"
Sage Weil4e7a5dc2009-11-18 16:19:57 -080012#include "auth.h"
Sage Weil93cea5b2009-12-23 12:21:51 -080013#include "pagelist.h"
Sage Weil2f2dc052009-10-06 11:31:09 -070014
15/*
16 * A cluster of MDS (metadata server) daemons is responsible for
17 * managing the file system namespace (the directory hierarchy and
18 * inodes) and for coordinating shared access to storage. Metadata is
19 * partitioning hierarchically across a number of servers, and that
20 * partition varies over time as the cluster adjusts the distribution
21 * in order to balance load.
22 *
23 * The MDS client is primarily responsible to managing synchronous
24 * metadata requests for operations like open, unlink, and so forth.
25 * If there is a MDS failure, we find out about it when we (possibly
26 * request and) receive a new MDS map, and can resubmit affected
27 * requests.
28 *
29 * For the most part, though, we take advantage of a lossless
30 * communications channel to the MDS, and do not need to worry about
31 * timing out or resubmitting requests.
32 *
33 * We maintain a stateful "session" with each MDS we interact with.
34 * Within each session, we sent periodic heartbeat messages to ensure
35 * any capabilities or leases we have been issues remain valid. If
36 * the session times out and goes stale, our leases and capabilities
37 * are no longer valid.
38 */
39
40static void __wake_requests(struct ceph_mds_client *mdsc,
41 struct list_head *head);
42
43const static struct ceph_connection_operations mds_con_ops;
44
45
46/*
47 * mds reply parsing
48 */
49
50/*
51 * parse individual inode info
52 */
53static int parse_reply_info_in(void **p, void *end,
54 struct ceph_mds_reply_info_in *info)
55{
56 int err = -EIO;
57
58 info->in = *p;
59 *p += sizeof(struct ceph_mds_reply_inode) +
60 sizeof(*info->in->fragtree.splits) *
61 le32_to_cpu(info->in->fragtree.nsplits);
62
63 ceph_decode_32_safe(p, end, info->symlink_len, bad);
64 ceph_decode_need(p, end, info->symlink_len, bad);
65 info->symlink = *p;
66 *p += info->symlink_len;
67
68 ceph_decode_32_safe(p, end, info->xattr_len, bad);
69 ceph_decode_need(p, end, info->xattr_len, bad);
70 info->xattr_data = *p;
71 *p += info->xattr_len;
72 return 0;
73bad:
74 return err;
75}
76
77/*
78 * parse a normal reply, which may contain a (dir+)dentry and/or a
79 * target inode.
80 */
81static int parse_reply_info_trace(void **p, void *end,
82 struct ceph_mds_reply_info_parsed *info)
83{
84 int err;
85
86 if (info->head->is_dentry) {
87 err = parse_reply_info_in(p, end, &info->diri);
88 if (err < 0)
89 goto out_bad;
90
91 if (unlikely(*p + sizeof(*info->dirfrag) > end))
92 goto bad;
93 info->dirfrag = *p;
94 *p += sizeof(*info->dirfrag) +
95 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
96 if (unlikely(*p > end))
97 goto bad;
98
99 ceph_decode_32_safe(p, end, info->dname_len, bad);
100 ceph_decode_need(p, end, info->dname_len, bad);
101 info->dname = *p;
102 *p += info->dname_len;
103 info->dlease = *p;
104 *p += sizeof(*info->dlease);
105 }
106
107 if (info->head->is_target) {
108 err = parse_reply_info_in(p, end, &info->targeti);
109 if (err < 0)
110 goto out_bad;
111 }
112
113 if (unlikely(*p != end))
114 goto bad;
115 return 0;
116
117bad:
118 err = -EIO;
119out_bad:
120 pr_err("problem parsing mds trace %d\n", err);
121 return err;
122}
123
124/*
125 * parse readdir results
126 */
127static int parse_reply_info_dir(void **p, void *end,
128 struct ceph_mds_reply_info_parsed *info)
129{
130 u32 num, i = 0;
131 int err;
132
133 info->dir_dir = *p;
134 if (*p + sizeof(*info->dir_dir) > end)
135 goto bad;
136 *p += sizeof(*info->dir_dir) +
137 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
138 if (*p > end)
139 goto bad;
140
141 ceph_decode_need(p, end, sizeof(num) + 2, bad);
Sage Weilc89136e2009-10-14 09:59:09 -0700142 num = ceph_decode_32(p);
143 info->dir_end = ceph_decode_8(p);
144 info->dir_complete = ceph_decode_8(p);
Sage Weil2f2dc052009-10-06 11:31:09 -0700145 if (num == 0)
146 goto done;
147
148 /* alloc large array */
149 info->dir_nr = num;
150 info->dir_in = kcalloc(num, sizeof(*info->dir_in) +
151 sizeof(*info->dir_dname) +
152 sizeof(*info->dir_dname_len) +
153 sizeof(*info->dir_dlease),
154 GFP_NOFS);
155 if (info->dir_in == NULL) {
156 err = -ENOMEM;
157 goto out_bad;
158 }
159 info->dir_dname = (void *)(info->dir_in + num);
160 info->dir_dname_len = (void *)(info->dir_dname + num);
161 info->dir_dlease = (void *)(info->dir_dname_len + num);
162
163 while (num) {
164 /* dentry */
165 ceph_decode_need(p, end, sizeof(u32)*2, bad);
Sage Weilc89136e2009-10-14 09:59:09 -0700166 info->dir_dname_len[i] = ceph_decode_32(p);
Sage Weil2f2dc052009-10-06 11:31:09 -0700167 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
168 info->dir_dname[i] = *p;
169 *p += info->dir_dname_len[i];
170 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
171 info->dir_dname[i]);
172 info->dir_dlease[i] = *p;
173 *p += sizeof(struct ceph_mds_reply_lease);
174
175 /* inode */
176 err = parse_reply_info_in(p, end, &info->dir_in[i]);
177 if (err < 0)
178 goto out_bad;
179 i++;
180 num--;
181 }
182
183done:
184 if (*p != end)
185 goto bad;
186 return 0;
187
188bad:
189 err = -EIO;
190out_bad:
191 pr_err("problem parsing dir contents %d\n", err);
192 return err;
193}
194
195/*
196 * parse entire mds reply
197 */
198static int parse_reply_info(struct ceph_msg *msg,
199 struct ceph_mds_reply_info_parsed *info)
200{
201 void *p, *end;
202 u32 len;
203 int err;
204
205 info->head = msg->front.iov_base;
206 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
207 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
208
209 /* trace */
210 ceph_decode_32_safe(&p, end, len, bad);
211 if (len > 0) {
212 err = parse_reply_info_trace(&p, p+len, info);
213 if (err < 0)
214 goto out_bad;
215 }
216
217 /* dir content */
218 ceph_decode_32_safe(&p, end, len, bad);
219 if (len > 0) {
220 err = parse_reply_info_dir(&p, p+len, info);
221 if (err < 0)
222 goto out_bad;
223 }
224
225 /* snap blob */
226 ceph_decode_32_safe(&p, end, len, bad);
227 info->snapblob_len = len;
228 info->snapblob = p;
229 p += len;
230
231 if (p != end)
232 goto bad;
233 return 0;
234
235bad:
236 err = -EIO;
237out_bad:
238 pr_err("mds parse_reply err %d\n", err);
239 return err;
240}
241
242static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
243{
244 kfree(info->dir_in);
245}
246
247
248/*
249 * sessions
250 */
251static const char *session_state_name(int s)
252{
253 switch (s) {
254 case CEPH_MDS_SESSION_NEW: return "new";
255 case CEPH_MDS_SESSION_OPENING: return "opening";
256 case CEPH_MDS_SESSION_OPEN: return "open";
257 case CEPH_MDS_SESSION_HUNG: return "hung";
258 case CEPH_MDS_SESSION_CLOSING: return "closing";
Sage Weil44ca18f2010-02-15 12:08:46 -0800259 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
Sage Weil2f2dc052009-10-06 11:31:09 -0700260 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
261 default: return "???";
262 }
263}
264
265static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
266{
267 if (atomic_inc_not_zero(&s->s_ref)) {
268 dout("mdsc get_session %p %d -> %d\n", s,
269 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
270 return s;
271 } else {
272 dout("mdsc get_session %p 0 -- FAIL", s);
273 return NULL;
274 }
275}
276
277void ceph_put_mds_session(struct ceph_mds_session *s)
278{
279 dout("mdsc put_session %p %d -> %d\n", s,
280 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800281 if (atomic_dec_and_test(&s->s_ref)) {
282 if (s->s_authorizer)
283 s->s_mdsc->client->monc.auth->ops->destroy_authorizer(
284 s->s_mdsc->client->monc.auth, s->s_authorizer);
Sage Weil2f2dc052009-10-06 11:31:09 -0700285 kfree(s);
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800286 }
Sage Weil2f2dc052009-10-06 11:31:09 -0700287}
288
289/*
290 * called under mdsc->mutex
291 */
292struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
293 int mds)
294{
295 struct ceph_mds_session *session;
296
297 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
298 return NULL;
299 session = mdsc->sessions[mds];
300 dout("lookup_mds_session %p %d\n", session,
301 atomic_read(&session->s_ref));
302 get_session(session);
303 return session;
304}
305
306static bool __have_session(struct ceph_mds_client *mdsc, int mds)
307{
308 if (mds >= mdsc->max_sessions)
309 return false;
310 return mdsc->sessions[mds];
311}
312
Sage Weil2600d2d2010-02-22 15:12:16 -0800313static int __verify_registered_session(struct ceph_mds_client *mdsc,
314 struct ceph_mds_session *s)
315{
316 if (s->s_mds >= mdsc->max_sessions ||
317 mdsc->sessions[s->s_mds] != s)
318 return -ENOENT;
319 return 0;
320}
321
Sage Weil2f2dc052009-10-06 11:31:09 -0700322/*
323 * create+register a new session for given mds.
324 * called under mdsc->mutex.
325 */
326static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
327 int mds)
328{
329 struct ceph_mds_session *s;
330
331 s = kzalloc(sizeof(*s), GFP_NOFS);
Dan Carpenter4736b002010-03-20 15:30:16 +0300332 if (!s)
333 return ERR_PTR(-ENOMEM);
Sage Weil2f2dc052009-10-06 11:31:09 -0700334 s->s_mdsc = mdsc;
335 s->s_mds = mds;
336 s->s_state = CEPH_MDS_SESSION_NEW;
337 s->s_ttl = 0;
338 s->s_seq = 0;
339 mutex_init(&s->s_mutex);
340
341 ceph_con_init(mdsc->client->msgr, &s->s_con);
342 s->s_con.private = s;
343 s->s_con.ops = &mds_con_ops;
344 s->s_con.peer_name.type = CEPH_ENTITY_TYPE_MDS;
345 s->s_con.peer_name.num = cpu_to_le64(mds);
Sage Weil2f2dc052009-10-06 11:31:09 -0700346
347 spin_lock_init(&s->s_cap_lock);
348 s->s_cap_gen = 0;
349 s->s_cap_ttl = 0;
350 s->s_renew_requested = 0;
351 s->s_renew_seq = 0;
352 INIT_LIST_HEAD(&s->s_caps);
353 s->s_nr_caps = 0;
Sage Weil5dacf092009-12-21 20:40:34 -0800354 s->s_trim_caps = 0;
Sage Weil2f2dc052009-10-06 11:31:09 -0700355 atomic_set(&s->s_ref, 1);
356 INIT_LIST_HEAD(&s->s_waiting);
357 INIT_LIST_HEAD(&s->s_unsafe);
358 s->s_num_cap_releases = 0;
Sage Weil7c1332b2010-02-16 11:39:45 -0800359 s->s_cap_iterator = NULL;
Sage Weil2f2dc052009-10-06 11:31:09 -0700360 INIT_LIST_HEAD(&s->s_cap_releases);
361 INIT_LIST_HEAD(&s->s_cap_releases_done);
362 INIT_LIST_HEAD(&s->s_cap_flushing);
363 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
364
365 dout("register_session mds%d\n", mds);
366 if (mds >= mdsc->max_sessions) {
367 int newmax = 1 << get_count_order(mds+1);
368 struct ceph_mds_session **sa;
369
370 dout("register_session realloc to %d\n", newmax);
371 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
372 if (sa == NULL)
Sage Weil42ce56e2009-11-18 11:22:36 -0800373 goto fail_realloc;
Sage Weil2f2dc052009-10-06 11:31:09 -0700374 if (mdsc->sessions) {
375 memcpy(sa, mdsc->sessions,
376 mdsc->max_sessions * sizeof(void *));
377 kfree(mdsc->sessions);
378 }
379 mdsc->sessions = sa;
380 mdsc->max_sessions = newmax;
381 }
382 mdsc->sessions[mds] = s;
383 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
Sage Weil42ce56e2009-11-18 11:22:36 -0800384
385 ceph_con_open(&s->s_con, ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
386
Sage Weil2f2dc052009-10-06 11:31:09 -0700387 return s;
Sage Weil42ce56e2009-11-18 11:22:36 -0800388
389fail_realloc:
390 kfree(s);
391 return ERR_PTR(-ENOMEM);
Sage Weil2f2dc052009-10-06 11:31:09 -0700392}
393
394/*
395 * called under mdsc->mutex
396 */
Sage Weil2600d2d2010-02-22 15:12:16 -0800397static void __unregister_session(struct ceph_mds_client *mdsc,
Sage Weil42ce56e2009-11-18 11:22:36 -0800398 struct ceph_mds_session *s)
Sage Weil2f2dc052009-10-06 11:31:09 -0700399{
Sage Weil2600d2d2010-02-22 15:12:16 -0800400 dout("__unregister_session mds%d %p\n", s->s_mds, s);
401 BUG_ON(mdsc->sessions[s->s_mds] != s);
Sage Weil42ce56e2009-11-18 11:22:36 -0800402 mdsc->sessions[s->s_mds] = NULL;
403 ceph_con_close(&s->s_con);
404 ceph_put_mds_session(s);
Sage Weil2f2dc052009-10-06 11:31:09 -0700405}
406
407/*
408 * drop session refs in request.
409 *
410 * should be last request ref, or hold mdsc->mutex
411 */
412static void put_request_session(struct ceph_mds_request *req)
413{
414 if (req->r_session) {
415 ceph_put_mds_session(req->r_session);
416 req->r_session = NULL;
417 }
418}
419
Sage Weil153c8e62009-12-07 12:31:09 -0800420void ceph_mdsc_release_request(struct kref *kref)
Sage Weil2f2dc052009-10-06 11:31:09 -0700421{
Sage Weil153c8e62009-12-07 12:31:09 -0800422 struct ceph_mds_request *req = container_of(kref,
423 struct ceph_mds_request,
424 r_kref);
425 if (req->r_request)
426 ceph_msg_put(req->r_request);
427 if (req->r_reply) {
428 ceph_msg_put(req->r_reply);
429 destroy_reply_info(&req->r_reply_info);
Sage Weil2f2dc052009-10-06 11:31:09 -0700430 }
Sage Weil153c8e62009-12-07 12:31:09 -0800431 if (req->r_inode) {
432 ceph_put_cap_refs(ceph_inode(req->r_inode),
433 CEPH_CAP_PIN);
434 iput(req->r_inode);
435 }
436 if (req->r_locked_dir)
437 ceph_put_cap_refs(ceph_inode(req->r_locked_dir),
438 CEPH_CAP_PIN);
439 if (req->r_target_inode)
440 iput(req->r_target_inode);
441 if (req->r_dentry)
442 dput(req->r_dentry);
443 if (req->r_old_dentry) {
444 ceph_put_cap_refs(
445 ceph_inode(req->r_old_dentry->d_parent->d_inode),
446 CEPH_CAP_PIN);
447 dput(req->r_old_dentry);
448 }
449 kfree(req->r_path1);
450 kfree(req->r_path2);
451 put_request_session(req);
452 ceph_unreserve_caps(&req->r_caps_reservation);
453 kfree(req);
Sage Weil2f2dc052009-10-06 11:31:09 -0700454}
455
456/*
457 * lookup session, bump ref if found.
458 *
459 * called under mdsc->mutex.
460 */
461static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
462 u64 tid)
463{
464 struct ceph_mds_request *req;
Sage Weil44ca18f2010-02-15 12:08:46 -0800465 struct rb_node *n = mdsc->request_tree.rb_node;
466
467 while (n) {
468 req = rb_entry(n, struct ceph_mds_request, r_node);
469 if (tid < req->r_tid)
470 n = n->rb_left;
471 else if (tid > req->r_tid)
472 n = n->rb_right;
473 else {
474 ceph_mdsc_get_request(req);
475 return req;
476 }
477 }
478 return NULL;
479}
480
481static void __insert_request(struct ceph_mds_client *mdsc,
482 struct ceph_mds_request *new)
483{
484 struct rb_node **p = &mdsc->request_tree.rb_node;
485 struct rb_node *parent = NULL;
486 struct ceph_mds_request *req = NULL;
487
488 while (*p) {
489 parent = *p;
490 req = rb_entry(parent, struct ceph_mds_request, r_node);
491 if (new->r_tid < req->r_tid)
492 p = &(*p)->rb_left;
493 else if (new->r_tid > req->r_tid)
494 p = &(*p)->rb_right;
495 else
496 BUG();
497 }
498
499 rb_link_node(&new->r_node, parent, p);
500 rb_insert_color(&new->r_node, &mdsc->request_tree);
Sage Weil2f2dc052009-10-06 11:31:09 -0700501}
502
503/*
504 * Register an in-flight request, and assign a tid. Link to directory
505 * are modifying (if any).
506 *
507 * Called under mdsc->mutex.
508 */
509static void __register_request(struct ceph_mds_client *mdsc,
510 struct ceph_mds_request *req,
511 struct inode *dir)
512{
513 req->r_tid = ++mdsc->last_tid;
514 if (req->r_num_caps)
515 ceph_reserve_caps(&req->r_caps_reservation, req->r_num_caps);
516 dout("__register_request %p tid %lld\n", req, req->r_tid);
517 ceph_mdsc_get_request(req);
Sage Weil44ca18f2010-02-15 12:08:46 -0800518 __insert_request(mdsc, req);
Sage Weil2f2dc052009-10-06 11:31:09 -0700519
520 if (dir) {
521 struct ceph_inode_info *ci = ceph_inode(dir);
522
523 spin_lock(&ci->i_unsafe_lock);
524 req->r_unsafe_dir = dir;
525 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
526 spin_unlock(&ci->i_unsafe_lock);
527 }
528}
529
530static void __unregister_request(struct ceph_mds_client *mdsc,
531 struct ceph_mds_request *req)
532{
533 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
Sage Weil44ca18f2010-02-15 12:08:46 -0800534 rb_erase(&req->r_node, &mdsc->request_tree);
Sage Weil80fc7312010-03-16 15:28:54 -0700535 RB_CLEAR_NODE(&req->r_node);
Sage Weil2f2dc052009-10-06 11:31:09 -0700536
537 if (req->r_unsafe_dir) {
538 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
539
540 spin_lock(&ci->i_unsafe_lock);
541 list_del_init(&req->r_unsafe_dir_item);
542 spin_unlock(&ci->i_unsafe_lock);
543 }
Sage Weil94aa8ae2010-03-28 21:22:50 -0700544
545 ceph_mdsc_put_request(req);
Sage Weil2f2dc052009-10-06 11:31:09 -0700546}
547
548/*
549 * Choose mds to send request to next. If there is a hint set in the
550 * request (e.g., due to a prior forward hint from the mds), use that.
551 * Otherwise, consult frag tree and/or caps to identify the
552 * appropriate mds. If all else fails, choose randomly.
553 *
554 * Called under mdsc->mutex.
555 */
556static int __choose_mds(struct ceph_mds_client *mdsc,
557 struct ceph_mds_request *req)
558{
559 struct inode *inode;
560 struct ceph_inode_info *ci;
561 struct ceph_cap *cap;
562 int mode = req->r_direct_mode;
563 int mds = -1;
564 u32 hash = req->r_direct_hash;
565 bool is_hash = req->r_direct_is_hash;
566
567 /*
568 * is there a specific mds we should try? ignore hint if we have
569 * no session and the mds is not up (active or recovering).
570 */
571 if (req->r_resend_mds >= 0 &&
572 (__have_session(mdsc, req->r_resend_mds) ||
573 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
574 dout("choose_mds using resend_mds mds%d\n",
575 req->r_resend_mds);
576 return req->r_resend_mds;
577 }
578
579 if (mode == USE_RANDOM_MDS)
580 goto random;
581
582 inode = NULL;
583 if (req->r_inode) {
584 inode = req->r_inode;
585 } else if (req->r_dentry) {
586 if (req->r_dentry->d_inode) {
587 inode = req->r_dentry->d_inode;
588 } else {
589 inode = req->r_dentry->d_parent->d_inode;
590 hash = req->r_dentry->d_name.hash;
591 is_hash = true;
592 }
593 }
594 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
595 (int)hash, mode);
596 if (!inode)
597 goto random;
598 ci = ceph_inode(inode);
599
600 if (is_hash && S_ISDIR(inode->i_mode)) {
601 struct ceph_inode_frag frag;
602 int found;
603
604 ceph_choose_frag(ci, hash, &frag, &found);
605 if (found) {
606 if (mode == USE_ANY_MDS && frag.ndist > 0) {
607 u8 r;
608
609 /* choose a random replica */
610 get_random_bytes(&r, 1);
611 r %= frag.ndist;
612 mds = frag.dist[r];
613 dout("choose_mds %p %llx.%llx "
614 "frag %u mds%d (%d/%d)\n",
615 inode, ceph_vinop(inode),
616 frag.frag, frag.mds,
617 (int)r, frag.ndist);
618 return mds;
619 }
620
621 /* since this file/dir wasn't known to be
622 * replicated, then we want to look for the
623 * authoritative mds. */
624 mode = USE_AUTH_MDS;
625 if (frag.mds >= 0) {
626 /* choose auth mds */
627 mds = frag.mds;
628 dout("choose_mds %p %llx.%llx "
629 "frag %u mds%d (auth)\n",
630 inode, ceph_vinop(inode), frag.frag, mds);
631 return mds;
632 }
633 }
634 }
635
636 spin_lock(&inode->i_lock);
637 cap = NULL;
638 if (mode == USE_AUTH_MDS)
639 cap = ci->i_auth_cap;
640 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
641 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
642 if (!cap) {
643 spin_unlock(&inode->i_lock);
644 goto random;
645 }
646 mds = cap->session->s_mds;
647 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
648 inode, ceph_vinop(inode), mds,
649 cap == ci->i_auth_cap ? "auth " : "", cap);
650 spin_unlock(&inode->i_lock);
651 return mds;
652
653random:
654 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
655 dout("choose_mds chose random mds%d\n", mds);
656 return mds;
657}
658
659
660/*
661 * session messages
662 */
663static struct ceph_msg *create_session_msg(u32 op, u64 seq)
664{
665 struct ceph_msg *msg;
666 struct ceph_mds_session_head *h;
667
Sage Weilbb257662010-04-01 16:07:23 -0700668 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h));
Sage Weila79832f2010-04-01 16:06:19 -0700669 if (!msg) {
Sage Weil2f2dc052009-10-06 11:31:09 -0700670 pr_err("create_session_msg ENOMEM creating msg\n");
Sage Weila79832f2010-04-01 16:06:19 -0700671 return NULL;
Sage Weil2f2dc052009-10-06 11:31:09 -0700672 }
673 h = msg->front.iov_base;
674 h->op = cpu_to_le32(op);
675 h->seq = cpu_to_le64(seq);
676 return msg;
677}
678
679/*
680 * send session open request.
681 *
682 * called under mdsc->mutex
683 */
684static int __open_session(struct ceph_mds_client *mdsc,
685 struct ceph_mds_session *session)
686{
687 struct ceph_msg *msg;
688 int mstate;
689 int mds = session->s_mds;
Sage Weil2f2dc052009-10-06 11:31:09 -0700690
691 /* wait for mds to go active? */
692 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
693 dout("open_session to mds%d (%s)\n", mds,
694 ceph_mds_state_name(mstate));
695 session->s_state = CEPH_MDS_SESSION_OPENING;
696 session->s_renew_requested = jiffies;
697
698 /* send connect message */
699 msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq);
Sage Weila79832f2010-04-01 16:06:19 -0700700 if (!msg)
701 return -ENOMEM;
Sage Weil2f2dc052009-10-06 11:31:09 -0700702 ceph_con_send(&session->s_con, msg);
Sage Weil2f2dc052009-10-06 11:31:09 -0700703 return 0;
704}
705
706/*
707 * session caps
708 */
709
710/*
711 * Free preallocated cap messages assigned to this session
712 */
713static void cleanup_cap_releases(struct ceph_mds_session *session)
714{
715 struct ceph_msg *msg;
716
717 spin_lock(&session->s_cap_lock);
718 while (!list_empty(&session->s_cap_releases)) {
719 msg = list_first_entry(&session->s_cap_releases,
720 struct ceph_msg, list_head);
721 list_del_init(&msg->list_head);
722 ceph_msg_put(msg);
723 }
724 while (!list_empty(&session->s_cap_releases_done)) {
725 msg = list_first_entry(&session->s_cap_releases_done,
726 struct ceph_msg, list_head);
727 list_del_init(&msg->list_head);
728 ceph_msg_put(msg);
729 }
730 spin_unlock(&session->s_cap_lock);
731}
732
733/*
Sage Weilf818a732010-05-11 20:56:31 -0700734 * Helper to safely iterate over all caps associated with a session, with
735 * special care taken to handle a racing __ceph_remove_cap().
Sage Weil2f2dc052009-10-06 11:31:09 -0700736 *
Sage Weilf818a732010-05-11 20:56:31 -0700737 * Caller must hold session s_mutex.
Sage Weil2f2dc052009-10-06 11:31:09 -0700738 */
739static int iterate_session_caps(struct ceph_mds_session *session,
740 int (*cb)(struct inode *, struct ceph_cap *,
741 void *), void *arg)
742{
Sage Weil7c1332b2010-02-16 11:39:45 -0800743 struct list_head *p;
744 struct ceph_cap *cap;
745 struct inode *inode, *last_inode = NULL;
746 struct ceph_cap *old_cap = NULL;
Sage Weil2f2dc052009-10-06 11:31:09 -0700747 int ret;
748
749 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
750 spin_lock(&session->s_cap_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -0800751 p = session->s_caps.next;
752 while (p != &session->s_caps) {
753 cap = list_entry(p, struct ceph_cap, session_caps);
Sage Weil2f2dc052009-10-06 11:31:09 -0700754 inode = igrab(&cap->ci->vfs_inode);
Sage Weil7c1332b2010-02-16 11:39:45 -0800755 if (!inode) {
756 p = p->next;
Sage Weil2f2dc052009-10-06 11:31:09 -0700757 continue;
Sage Weil7c1332b2010-02-16 11:39:45 -0800758 }
759 session->s_cap_iterator = cap;
Sage Weil2f2dc052009-10-06 11:31:09 -0700760 spin_unlock(&session->s_cap_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -0800761
762 if (last_inode) {
763 iput(last_inode);
764 last_inode = NULL;
765 }
766 if (old_cap) {
767 ceph_put_cap(old_cap);
768 old_cap = NULL;
769 }
770
Sage Weil2f2dc052009-10-06 11:31:09 -0700771 ret = cb(inode, cap, arg);
Sage Weil7c1332b2010-02-16 11:39:45 -0800772 last_inode = inode;
773
Sage Weil2f2dc052009-10-06 11:31:09 -0700774 spin_lock(&session->s_cap_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -0800775 p = p->next;
776 if (cap->ci == NULL) {
777 dout("iterate_session_caps finishing cap %p removal\n",
778 cap);
779 BUG_ON(cap->session != session);
780 list_del_init(&cap->session_caps);
781 session->s_nr_caps--;
782 cap->session = NULL;
783 old_cap = cap; /* put_cap it w/o locks held */
784 }
Sage Weil5dacf092009-12-21 20:40:34 -0800785 if (ret < 0)
786 goto out;
Sage Weil2f2dc052009-10-06 11:31:09 -0700787 }
Sage Weil5dacf092009-12-21 20:40:34 -0800788 ret = 0;
789out:
Sage Weil7c1332b2010-02-16 11:39:45 -0800790 session->s_cap_iterator = NULL;
Sage Weil2f2dc052009-10-06 11:31:09 -0700791 spin_unlock(&session->s_cap_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -0800792
793 if (last_inode)
794 iput(last_inode);
795 if (old_cap)
796 ceph_put_cap(old_cap);
797
Sage Weil5dacf092009-12-21 20:40:34 -0800798 return ret;
Sage Weil2f2dc052009-10-06 11:31:09 -0700799}
800
801static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
802 void *arg)
803{
804 struct ceph_inode_info *ci = ceph_inode(inode);
805 dout("removing cap %p, ci is %p, inode is %p\n",
806 cap, ci, &ci->vfs_inode);
807 ceph_remove_cap(cap);
808 return 0;
809}
810
811/*
812 * caller must hold session s_mutex
813 */
814static void remove_session_caps(struct ceph_mds_session *session)
815{
816 dout("remove_session_caps on %p\n", session);
817 iterate_session_caps(session, remove_session_caps_cb, NULL);
818 BUG_ON(session->s_nr_caps > 0);
819 cleanup_cap_releases(session);
820}
821
822/*
823 * wake up any threads waiting on this session's caps. if the cap is
824 * old (didn't get renewed on the client reconnect), remove it now.
825 *
826 * caller must hold s_mutex.
827 */
828static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
829 void *arg)
830{
Sage Weil0dc25702009-11-20 13:43:45 -0800831 struct ceph_inode_info *ci = ceph_inode(inode);
832
833 wake_up(&ci->i_cap_wq);
834 if (arg) {
835 spin_lock(&inode->i_lock);
836 ci->i_wanted_max_size = 0;
837 ci->i_requested_max_size = 0;
838 spin_unlock(&inode->i_lock);
839 }
Sage Weil2f2dc052009-10-06 11:31:09 -0700840 return 0;
841}
842
Sage Weil0dc25702009-11-20 13:43:45 -0800843static void wake_up_session_caps(struct ceph_mds_session *session,
844 int reconnect)
Sage Weil2f2dc052009-10-06 11:31:09 -0700845{
846 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
Sage Weil0dc25702009-11-20 13:43:45 -0800847 iterate_session_caps(session, wake_up_session_cb,
848 (void *)(unsigned long)reconnect);
Sage Weil2f2dc052009-10-06 11:31:09 -0700849}
850
851/*
852 * Send periodic message to MDS renewing all currently held caps. The
853 * ack will reset the expiration for all caps from this session.
854 *
855 * caller holds s_mutex
856 */
857static int send_renew_caps(struct ceph_mds_client *mdsc,
858 struct ceph_mds_session *session)
859{
860 struct ceph_msg *msg;
861 int state;
862
863 if (time_after_eq(jiffies, session->s_cap_ttl) &&
864 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
865 pr_info("mds%d caps stale\n", session->s_mds);
Sage Weile4cb4cb2010-03-18 13:43:09 -0700866 session->s_renew_requested = jiffies;
Sage Weil2f2dc052009-10-06 11:31:09 -0700867
868 /* do not try to renew caps until a recovering mds has reconnected
869 * with its clients. */
870 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
871 if (state < CEPH_MDS_STATE_RECONNECT) {
872 dout("send_renew_caps ignoring mds%d (%s)\n",
873 session->s_mds, ceph_mds_state_name(state));
874 return 0;
875 }
876
877 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
878 ceph_mds_state_name(state));
Sage Weil2f2dc052009-10-06 11:31:09 -0700879 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
880 ++session->s_renew_seq);
Sage Weila79832f2010-04-01 16:06:19 -0700881 if (!msg)
882 return -ENOMEM;
Sage Weil2f2dc052009-10-06 11:31:09 -0700883 ceph_con_send(&session->s_con, msg);
884 return 0;
885}
886
887/*
888 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
Sage Weil0dc25702009-11-20 13:43:45 -0800889 *
890 * Called under session->s_mutex
Sage Weil2f2dc052009-10-06 11:31:09 -0700891 */
892static void renewed_caps(struct ceph_mds_client *mdsc,
893 struct ceph_mds_session *session, int is_renew)
894{
895 int was_stale;
896 int wake = 0;
897
898 spin_lock(&session->s_cap_lock);
899 was_stale = is_renew && (session->s_cap_ttl == 0 ||
900 time_after_eq(jiffies, session->s_cap_ttl));
901
902 session->s_cap_ttl = session->s_renew_requested +
903 mdsc->mdsmap->m_session_timeout*HZ;
904
905 if (was_stale) {
906 if (time_before(jiffies, session->s_cap_ttl)) {
907 pr_info("mds%d caps renewed\n", session->s_mds);
908 wake = 1;
909 } else {
910 pr_info("mds%d caps still stale\n", session->s_mds);
911 }
912 }
913 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
914 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
915 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
916 spin_unlock(&session->s_cap_lock);
917
918 if (wake)
Sage Weil0dc25702009-11-20 13:43:45 -0800919 wake_up_session_caps(session, 0);
Sage Weil2f2dc052009-10-06 11:31:09 -0700920}
921
922/*
923 * send a session close request
924 */
925static int request_close_session(struct ceph_mds_client *mdsc,
926 struct ceph_mds_session *session)
927{
928 struct ceph_msg *msg;
Sage Weil2f2dc052009-10-06 11:31:09 -0700929
930 dout("request_close_session mds%d state %s seq %lld\n",
931 session->s_mds, session_state_name(session->s_state),
932 session->s_seq);
933 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
Sage Weila79832f2010-04-01 16:06:19 -0700934 if (!msg)
935 return -ENOMEM;
936 ceph_con_send(&session->s_con, msg);
937 return 0;
Sage Weil2f2dc052009-10-06 11:31:09 -0700938}
939
940/*
941 * Called with s_mutex held.
942 */
943static int __close_session(struct ceph_mds_client *mdsc,
944 struct ceph_mds_session *session)
945{
946 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
947 return 0;
948 session->s_state = CEPH_MDS_SESSION_CLOSING;
949 return request_close_session(mdsc, session);
950}
951
952/*
953 * Trim old(er) caps.
954 *
955 * Because we can't cache an inode without one or more caps, we do
956 * this indirectly: if a cap is unused, we prune its aliases, at which
957 * point the inode will hopefully get dropped to.
958 *
959 * Yes, this is a bit sloppy. Our only real goal here is to respond to
960 * memory pressure from the MDS, though, so it needn't be perfect.
961 */
962static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
963{
964 struct ceph_mds_session *session = arg;
965 struct ceph_inode_info *ci = ceph_inode(inode);
966 int used, oissued, mine;
967
968 if (session->s_trim_caps <= 0)
969 return -1;
970
971 spin_lock(&inode->i_lock);
972 mine = cap->issued | cap->implemented;
973 used = __ceph_caps_used(ci);
974 oissued = __ceph_caps_issued_other(ci, cap);
975
976 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
977 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
978 ceph_cap_string(used));
979 if (ci->i_dirty_caps)
980 goto out; /* dirty caps */
981 if ((used & ~oissued) & mine)
982 goto out; /* we need these caps */
983
984 session->s_trim_caps--;
985 if (oissued) {
986 /* we aren't the only cap.. just remove us */
Sage Weil7c1332b2010-02-16 11:39:45 -0800987 __ceph_remove_cap(cap);
Sage Weil2f2dc052009-10-06 11:31:09 -0700988 } else {
989 /* try to drop referring dentries */
990 spin_unlock(&inode->i_lock);
991 d_prune_aliases(inode);
992 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
993 inode, cap, atomic_read(&inode->i_count));
994 return 0;
995 }
996
997out:
998 spin_unlock(&inode->i_lock);
999 return 0;
1000}
1001
1002/*
1003 * Trim session cap count down to some max number.
1004 */
1005static int trim_caps(struct ceph_mds_client *mdsc,
1006 struct ceph_mds_session *session,
1007 int max_caps)
1008{
1009 int trim_caps = session->s_nr_caps - max_caps;
1010
1011 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1012 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1013 if (trim_caps > 0) {
1014 session->s_trim_caps = trim_caps;
1015 iterate_session_caps(session, trim_caps_cb, session);
1016 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1017 session->s_mds, session->s_nr_caps, max_caps,
1018 trim_caps - session->s_trim_caps);
Sage Weil5dacf092009-12-21 20:40:34 -08001019 session->s_trim_caps = 0;
Sage Weil2f2dc052009-10-06 11:31:09 -07001020 }
1021 return 0;
1022}
1023
1024/*
1025 * Allocate cap_release messages. If there is a partially full message
1026 * in the queue, try to allocate enough to cover it's remainder, so that
1027 * we can send it immediately.
1028 *
1029 * Called under s_mutex.
1030 */
1031static int add_cap_releases(struct ceph_mds_client *mdsc,
1032 struct ceph_mds_session *session,
1033 int extra)
1034{
1035 struct ceph_msg *msg;
1036 struct ceph_mds_cap_release *head;
1037 int err = -ENOMEM;
1038
1039 if (extra < 0)
Sage Weil6b805182009-10-27 11:50:50 -07001040 extra = mdsc->client->mount_args->cap_release_safety;
Sage Weil2f2dc052009-10-06 11:31:09 -07001041
1042 spin_lock(&session->s_cap_lock);
1043
1044 if (!list_empty(&session->s_cap_releases)) {
1045 msg = list_first_entry(&session->s_cap_releases,
1046 struct ceph_msg,
1047 list_head);
1048 head = msg->front.iov_base;
1049 extra += CEPH_CAPS_PER_RELEASE - le32_to_cpu(head->num);
1050 }
1051
1052 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1053 spin_unlock(&session->s_cap_lock);
Sage Weilbb257662010-04-01 16:07:23 -07001054 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE);
Sage Weil2f2dc052009-10-06 11:31:09 -07001055 if (!msg)
1056 goto out_unlocked;
1057 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1058 (int)msg->front.iov_len);
1059 head = msg->front.iov_base;
1060 head->num = cpu_to_le32(0);
1061 msg->front.iov_len = sizeof(*head);
1062 spin_lock(&session->s_cap_lock);
1063 list_add(&msg->list_head, &session->s_cap_releases);
1064 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1065 }
1066
1067 if (!list_empty(&session->s_cap_releases)) {
1068 msg = list_first_entry(&session->s_cap_releases,
1069 struct ceph_msg,
1070 list_head);
1071 head = msg->front.iov_base;
1072 if (head->num) {
1073 dout(" queueing non-full %p (%d)\n", msg,
1074 le32_to_cpu(head->num));
1075 list_move_tail(&msg->list_head,
1076 &session->s_cap_releases_done);
1077 session->s_num_cap_releases -=
1078 CEPH_CAPS_PER_RELEASE - le32_to_cpu(head->num);
1079 }
1080 }
1081 err = 0;
1082 spin_unlock(&session->s_cap_lock);
1083out_unlocked:
1084 return err;
1085}
1086
1087/*
1088 * flush all dirty inode data to disk.
1089 *
1090 * returns true if we've flushed through want_flush_seq
1091 */
1092static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
1093{
1094 int mds, ret = 1;
1095
1096 dout("check_cap_flush want %lld\n", want_flush_seq);
1097 mutex_lock(&mdsc->mutex);
1098 for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
1099 struct ceph_mds_session *session = mdsc->sessions[mds];
1100
1101 if (!session)
1102 continue;
1103 get_session(session);
1104 mutex_unlock(&mdsc->mutex);
1105
1106 mutex_lock(&session->s_mutex);
1107 if (!list_empty(&session->s_cap_flushing)) {
1108 struct ceph_inode_info *ci =
1109 list_entry(session->s_cap_flushing.next,
1110 struct ceph_inode_info,
1111 i_flushing_item);
1112 struct inode *inode = &ci->vfs_inode;
1113
1114 spin_lock(&inode->i_lock);
1115 if (ci->i_cap_flush_seq <= want_flush_seq) {
1116 dout("check_cap_flush still flushing %p "
1117 "seq %lld <= %lld to mds%d\n", inode,
1118 ci->i_cap_flush_seq, want_flush_seq,
1119 session->s_mds);
1120 ret = 0;
1121 }
1122 spin_unlock(&inode->i_lock);
1123 }
1124 mutex_unlock(&session->s_mutex);
1125 ceph_put_mds_session(session);
1126
1127 if (!ret)
1128 return ret;
1129 mutex_lock(&mdsc->mutex);
1130 }
1131
1132 mutex_unlock(&mdsc->mutex);
1133 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
1134 return ret;
1135}
1136
1137/*
1138 * called under s_mutex
1139 */
1140static void send_cap_releases(struct ceph_mds_client *mdsc,
1141 struct ceph_mds_session *session)
1142{
1143 struct ceph_msg *msg;
1144
1145 dout("send_cap_releases mds%d\n", session->s_mds);
1146 while (1) {
1147 spin_lock(&session->s_cap_lock);
1148 if (list_empty(&session->s_cap_releases_done))
1149 break;
1150 msg = list_first_entry(&session->s_cap_releases_done,
1151 struct ceph_msg, list_head);
1152 list_del_init(&msg->list_head);
1153 spin_unlock(&session->s_cap_lock);
1154 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1155 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1156 ceph_con_send(&session->s_con, msg);
1157 }
1158 spin_unlock(&session->s_cap_lock);
1159}
1160
1161/*
1162 * requests
1163 */
1164
1165/*
1166 * Create an mds request.
1167 */
1168struct ceph_mds_request *
1169ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1170{
1171 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1172
1173 if (!req)
1174 return ERR_PTR(-ENOMEM);
1175
Sage Weilb4556392010-05-13 12:01:13 -07001176 mutex_init(&req->r_fill_mutex);
Sage Weil2f2dc052009-10-06 11:31:09 -07001177 req->r_started = jiffies;
1178 req->r_resend_mds = -1;
1179 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1180 req->r_fmode = -1;
Sage Weil153c8e62009-12-07 12:31:09 -08001181 kref_init(&req->r_kref);
Sage Weil2f2dc052009-10-06 11:31:09 -07001182 INIT_LIST_HEAD(&req->r_wait);
1183 init_completion(&req->r_completion);
1184 init_completion(&req->r_safe_completion);
1185 INIT_LIST_HEAD(&req->r_unsafe_item);
1186
1187 req->r_op = op;
1188 req->r_direct_mode = mode;
1189 return req;
1190}
1191
1192/*
Sage Weil44ca18f2010-02-15 12:08:46 -08001193 * return oldest (lowest) request, tid in request tree, 0 if none.
Sage Weil2f2dc052009-10-06 11:31:09 -07001194 *
1195 * called under mdsc->mutex.
1196 */
Sage Weil44ca18f2010-02-15 12:08:46 -08001197static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1198{
1199 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1200 return NULL;
1201 return rb_entry(rb_first(&mdsc->request_tree),
1202 struct ceph_mds_request, r_node);
1203}
1204
Sage Weil2f2dc052009-10-06 11:31:09 -07001205static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1206{
Sage Weil44ca18f2010-02-15 12:08:46 -08001207 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1208
1209 if (req)
1210 return req->r_tid;
1211 return 0;
Sage Weil2f2dc052009-10-06 11:31:09 -07001212}
1213
1214/*
1215 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1216 * on build_path_from_dentry in fs/cifs/dir.c.
1217 *
1218 * If @stop_on_nosnap, generate path relative to the first non-snapped
1219 * inode.
1220 *
1221 * Encode hidden .snap dirs as a double /, i.e.
1222 * foo/.snap/bar -> foo//bar
1223 */
1224char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1225 int stop_on_nosnap)
1226{
1227 struct dentry *temp;
1228 char *path;
1229 int len, pos;
1230
1231 if (dentry == NULL)
1232 return ERR_PTR(-EINVAL);
1233
1234retry:
1235 len = 0;
1236 for (temp = dentry; !IS_ROOT(temp);) {
1237 struct inode *inode = temp->d_inode;
1238 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1239 len++; /* slash only */
1240 else if (stop_on_nosnap && inode &&
1241 ceph_snap(inode) == CEPH_NOSNAP)
1242 break;
1243 else
1244 len += 1 + temp->d_name.len;
1245 temp = temp->d_parent;
1246 if (temp == NULL) {
1247 pr_err("build_path_dentry corrupt dentry %p\n", dentry);
1248 return ERR_PTR(-EINVAL);
1249 }
1250 }
1251 if (len)
1252 len--; /* no leading '/' */
1253
1254 path = kmalloc(len+1, GFP_NOFS);
1255 if (path == NULL)
1256 return ERR_PTR(-ENOMEM);
1257 pos = len;
1258 path[pos] = 0; /* trailing null */
1259 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1260 struct inode *inode = temp->d_inode;
1261
1262 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
Sage Weil104648a2010-03-18 10:14:30 -07001263 dout("build_path path+%d: %p SNAPDIR\n",
Sage Weil2f2dc052009-10-06 11:31:09 -07001264 pos, temp);
1265 } else if (stop_on_nosnap && inode &&
1266 ceph_snap(inode) == CEPH_NOSNAP) {
1267 break;
1268 } else {
1269 pos -= temp->d_name.len;
1270 if (pos < 0)
1271 break;
1272 strncpy(path + pos, temp->d_name.name,
1273 temp->d_name.len);
Sage Weil2f2dc052009-10-06 11:31:09 -07001274 }
1275 if (pos)
1276 path[--pos] = '/';
1277 temp = temp->d_parent;
1278 if (temp == NULL) {
Sage Weil104648a2010-03-18 10:14:30 -07001279 pr_err("build_path corrupt dentry\n");
Sage Weil2f2dc052009-10-06 11:31:09 -07001280 kfree(path);
1281 return ERR_PTR(-EINVAL);
1282 }
1283 }
1284 if (pos != 0) {
Sage Weil104648a2010-03-18 10:14:30 -07001285 pr_err("build_path did not end path lookup where "
Sage Weil2f2dc052009-10-06 11:31:09 -07001286 "expected, namelen is %d, pos is %d\n", len, pos);
1287 /* presumably this is only possible if racing with a
1288 rename of one of the parent directories (we can not
1289 lock the dentries above us to prevent this, but
1290 retrying should be harmless) */
1291 kfree(path);
1292 goto retry;
1293 }
1294
1295 *base = ceph_ino(temp->d_inode);
1296 *plen = len;
Sage Weil104648a2010-03-18 10:14:30 -07001297 dout("build_path on %p %d built %llx '%.*s'\n",
Sage Weil2f2dc052009-10-06 11:31:09 -07001298 dentry, atomic_read(&dentry->d_count), *base, len, path);
1299 return path;
1300}
1301
1302static int build_dentry_path(struct dentry *dentry,
1303 const char **ppath, int *ppathlen, u64 *pino,
1304 int *pfreepath)
1305{
1306 char *path;
1307
1308 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1309 *pino = ceph_ino(dentry->d_parent->d_inode);
1310 *ppath = dentry->d_name.name;
1311 *ppathlen = dentry->d_name.len;
1312 return 0;
1313 }
1314 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1315 if (IS_ERR(path))
1316 return PTR_ERR(path);
1317 *ppath = path;
1318 *pfreepath = 1;
1319 return 0;
1320}
1321
1322static int build_inode_path(struct inode *inode,
1323 const char **ppath, int *ppathlen, u64 *pino,
1324 int *pfreepath)
1325{
1326 struct dentry *dentry;
1327 char *path;
1328
1329 if (ceph_snap(inode) == CEPH_NOSNAP) {
1330 *pino = ceph_ino(inode);
1331 *ppathlen = 0;
1332 return 0;
1333 }
1334 dentry = d_find_alias(inode);
1335 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1336 dput(dentry);
1337 if (IS_ERR(path))
1338 return PTR_ERR(path);
1339 *ppath = path;
1340 *pfreepath = 1;
1341 return 0;
1342}
1343
1344/*
1345 * request arguments may be specified via an inode *, a dentry *, or
1346 * an explicit ino+path.
1347 */
1348static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1349 const char *rpath, u64 rino,
1350 const char **ppath, int *pathlen,
1351 u64 *ino, int *freepath)
1352{
1353 int r = 0;
1354
1355 if (rinode) {
1356 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1357 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1358 ceph_snap(rinode));
1359 } else if (rdentry) {
1360 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1361 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1362 *ppath);
1363 } else if (rpath) {
1364 *ino = rino;
1365 *ppath = rpath;
1366 *pathlen = strlen(rpath);
1367 dout(" path %.*s\n", *pathlen, rpath);
1368 }
1369
1370 return r;
1371}
1372
1373/*
1374 * called under mdsc->mutex
1375 */
1376static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1377 struct ceph_mds_request *req,
1378 int mds)
1379{
1380 struct ceph_msg *msg;
1381 struct ceph_mds_request_head *head;
1382 const char *path1 = NULL;
1383 const char *path2 = NULL;
1384 u64 ino1 = 0, ino2 = 0;
1385 int pathlen1 = 0, pathlen2 = 0;
1386 int freepath1 = 0, freepath2 = 0;
1387 int len;
1388 u16 releases;
1389 void *p, *end;
1390 int ret;
1391
1392 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1393 req->r_path1, req->r_ino1.ino,
1394 &path1, &pathlen1, &ino1, &freepath1);
1395 if (ret < 0) {
1396 msg = ERR_PTR(ret);
1397 goto out;
1398 }
1399
1400 ret = set_request_path_attr(NULL, req->r_old_dentry,
1401 req->r_path2, req->r_ino2.ino,
1402 &path2, &pathlen2, &ino2, &freepath2);
1403 if (ret < 0) {
1404 msg = ERR_PTR(ret);
1405 goto out_free1;
1406 }
1407
1408 len = sizeof(*head) +
Sage Weilac8839d2010-01-27 14:28:10 -08001409 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
Sage Weil2f2dc052009-10-06 11:31:09 -07001410
1411 /* calculate (max) length for cap releases */
1412 len += sizeof(struct ceph_mds_request_release) *
1413 (!!req->r_inode_drop + !!req->r_dentry_drop +
1414 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1415 if (req->r_dentry_drop)
1416 len += req->r_dentry->d_name.len;
1417 if (req->r_old_dentry_drop)
1418 len += req->r_old_dentry->d_name.len;
1419
Sage Weilbb257662010-04-01 16:07:23 -07001420 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len);
Sage Weila79832f2010-04-01 16:06:19 -07001421 if (!msg) {
1422 msg = ERR_PTR(-ENOMEM);
Sage Weil2f2dc052009-10-06 11:31:09 -07001423 goto out_free2;
Sage Weila79832f2010-04-01 16:06:19 -07001424 }
Sage Weil2f2dc052009-10-06 11:31:09 -07001425
Sage Weil6df058c2009-12-22 11:24:33 -08001426 msg->hdr.tid = cpu_to_le64(req->r_tid);
1427
Sage Weil2f2dc052009-10-06 11:31:09 -07001428 head = msg->front.iov_base;
1429 p = msg->front.iov_base + sizeof(*head);
1430 end = msg->front.iov_base + msg->front.iov_len;
1431
1432 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1433 head->op = cpu_to_le32(req->r_op);
1434 head->caller_uid = cpu_to_le32(current_fsuid());
1435 head->caller_gid = cpu_to_le32(current_fsgid());
1436 head->args = req->r_args;
1437
1438 ceph_encode_filepath(&p, end, ino1, path1);
1439 ceph_encode_filepath(&p, end, ino2, path2);
1440
1441 /* cap releases */
1442 releases = 0;
1443 if (req->r_inode_drop)
1444 releases += ceph_encode_inode_release(&p,
1445 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1446 mds, req->r_inode_drop, req->r_inode_unless, 0);
1447 if (req->r_dentry_drop)
1448 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1449 mds, req->r_dentry_drop, req->r_dentry_unless);
1450 if (req->r_old_dentry_drop)
1451 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1452 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1453 if (req->r_old_inode_drop)
1454 releases += ceph_encode_inode_release(&p,
1455 req->r_old_dentry->d_inode,
1456 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1457 head->num_releases = cpu_to_le16(releases);
1458
1459 BUG_ON(p > end);
1460 msg->front.iov_len = p - msg->front.iov_base;
1461 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1462
1463 msg->pages = req->r_pages;
1464 msg->nr_pages = req->r_num_pages;
1465 msg->hdr.data_len = cpu_to_le32(req->r_data_len);
1466 msg->hdr.data_off = cpu_to_le16(0);
1467
1468out_free2:
1469 if (freepath2)
1470 kfree((char *)path2);
1471out_free1:
1472 if (freepath1)
1473 kfree((char *)path1);
1474out:
1475 return msg;
1476}
1477
1478/*
1479 * called under mdsc->mutex if error, under no mutex if
1480 * success.
1481 */
1482static void complete_request(struct ceph_mds_client *mdsc,
1483 struct ceph_mds_request *req)
1484{
1485 if (req->r_callback)
1486 req->r_callback(mdsc, req);
1487 else
1488 complete(&req->r_completion);
1489}
1490
1491/*
1492 * called under mdsc->mutex
1493 */
1494static int __prepare_send_request(struct ceph_mds_client *mdsc,
1495 struct ceph_mds_request *req,
1496 int mds)
1497{
1498 struct ceph_mds_request_head *rhead;
1499 struct ceph_msg *msg;
1500 int flags = 0;
1501
1502 req->r_mds = mds;
1503 req->r_attempts++;
1504 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
1505 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
1506
1507 if (req->r_request) {
1508 ceph_msg_put(req->r_request);
1509 req->r_request = NULL;
1510 }
1511 msg = create_request_message(mdsc, req, mds);
1512 if (IS_ERR(msg)) {
Sage Weile1518c72010-05-13 11:19:06 -07001513 req->r_err = PTR_ERR(msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07001514 complete_request(mdsc, req);
Sage Weila79832f2010-04-01 16:06:19 -07001515 return PTR_ERR(msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07001516 }
1517 req->r_request = msg;
1518
1519 rhead = msg->front.iov_base;
Sage Weil2f2dc052009-10-06 11:31:09 -07001520 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
1521 if (req->r_got_unsafe)
1522 flags |= CEPH_MDS_FLAG_REPLAY;
1523 if (req->r_locked_dir)
1524 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
1525 rhead->flags = cpu_to_le32(flags);
1526 rhead->num_fwd = req->r_num_fwd;
1527 rhead->num_retry = req->r_attempts - 1;
1528
1529 dout(" r_locked_dir = %p\n", req->r_locked_dir);
1530
1531 if (req->r_target_inode && req->r_got_unsafe)
1532 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
1533 else
1534 rhead->ino = 0;
1535 return 0;
1536}
1537
1538/*
1539 * send request, or put it on the appropriate wait list.
1540 */
1541static int __do_request(struct ceph_mds_client *mdsc,
1542 struct ceph_mds_request *req)
1543{
1544 struct ceph_mds_session *session = NULL;
1545 int mds = -1;
1546 int err = -EAGAIN;
1547
Sage Weile1518c72010-05-13 11:19:06 -07001548 if (req->r_err || req->r_got_result)
Sage Weil2f2dc052009-10-06 11:31:09 -07001549 goto out;
1550
1551 if (req->r_timeout &&
1552 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
1553 dout("do_request timed out\n");
1554 err = -EIO;
1555 goto finish;
1556 }
1557
1558 mds = __choose_mds(mdsc, req);
1559 if (mds < 0 ||
1560 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
1561 dout("do_request no mds or not active, waiting for map\n");
1562 list_add(&req->r_wait, &mdsc->waiting_for_map);
1563 goto out;
1564 }
1565
1566 /* get, open session */
1567 session = __ceph_lookup_mds_session(mdsc, mds);
Sage Weil9c4239562010-03-20 20:43:28 -07001568 if (!session) {
Sage Weil2f2dc052009-10-06 11:31:09 -07001569 session = register_session(mdsc, mds);
Sage Weil9c4239562010-03-20 20:43:28 -07001570 if (IS_ERR(session)) {
1571 err = PTR_ERR(session);
1572 goto finish;
1573 }
1574 }
Sage Weil2f2dc052009-10-06 11:31:09 -07001575 dout("do_request mds%d session %p state %s\n", mds, session,
1576 session_state_name(session->s_state));
1577 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
1578 session->s_state != CEPH_MDS_SESSION_HUNG) {
1579 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1580 session->s_state == CEPH_MDS_SESSION_CLOSING)
1581 __open_session(mdsc, session);
1582 list_add(&req->r_wait, &session->s_waiting);
1583 goto out_session;
1584 }
1585
1586 /* send request */
1587 req->r_session = get_session(session);
1588 req->r_resend_mds = -1; /* forget any previous mds hint */
1589
1590 if (req->r_request_started == 0) /* note request start time */
1591 req->r_request_started = jiffies;
1592
1593 err = __prepare_send_request(mdsc, req, mds);
1594 if (!err) {
1595 ceph_msg_get(req->r_request);
1596 ceph_con_send(&session->s_con, req->r_request);
1597 }
1598
1599out_session:
1600 ceph_put_mds_session(session);
1601out:
1602 return err;
1603
1604finish:
Sage Weile1518c72010-05-13 11:19:06 -07001605 req->r_err = err;
Sage Weil2f2dc052009-10-06 11:31:09 -07001606 complete_request(mdsc, req);
1607 goto out;
1608}
1609
1610/*
1611 * called under mdsc->mutex
1612 */
1613static void __wake_requests(struct ceph_mds_client *mdsc,
1614 struct list_head *head)
1615{
1616 struct ceph_mds_request *req, *nreq;
1617
1618 list_for_each_entry_safe(req, nreq, head, r_wait) {
1619 list_del_init(&req->r_wait);
1620 __do_request(mdsc, req);
1621 }
1622}
1623
1624/*
1625 * Wake up threads with requests pending for @mds, so that they can
1626 * resubmit their requests to a possibly different mds. If @all is set,
1627 * wake up if their requests has been forwarded to @mds, too.
1628 */
1629static void kick_requests(struct ceph_mds_client *mdsc, int mds, int all)
1630{
Sage Weil44ca18f2010-02-15 12:08:46 -08001631 struct ceph_mds_request *req;
1632 struct rb_node *p;
Sage Weil2f2dc052009-10-06 11:31:09 -07001633
1634 dout("kick_requests mds%d\n", mds);
Sage Weil44ca18f2010-02-15 12:08:46 -08001635 for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
1636 req = rb_entry(p, struct ceph_mds_request, r_node);
1637 if (req->r_got_unsafe)
1638 continue;
1639 if (req->r_session &&
1640 req->r_session->s_mds == mds) {
1641 dout(" kicking tid %llu\n", req->r_tid);
1642 put_request_session(req);
1643 __do_request(mdsc, req);
Sage Weil2f2dc052009-10-06 11:31:09 -07001644 }
1645 }
1646}
1647
1648void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
1649 struct ceph_mds_request *req)
1650{
1651 dout("submit_request on %p\n", req);
1652 mutex_lock(&mdsc->mutex);
1653 __register_request(mdsc, req, NULL);
1654 __do_request(mdsc, req);
1655 mutex_unlock(&mdsc->mutex);
1656}
1657
1658/*
1659 * Synchrously perform an mds request. Take care of all of the
1660 * session setup, forwarding, retry details.
1661 */
1662int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
1663 struct inode *dir,
1664 struct ceph_mds_request *req)
1665{
1666 int err;
1667
1668 dout("do_request on %p\n", req);
1669
1670 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
1671 if (req->r_inode)
1672 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
1673 if (req->r_locked_dir)
1674 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
1675 if (req->r_old_dentry)
1676 ceph_get_cap_refs(
1677 ceph_inode(req->r_old_dentry->d_parent->d_inode),
1678 CEPH_CAP_PIN);
1679
1680 /* issue */
1681 mutex_lock(&mdsc->mutex);
1682 __register_request(mdsc, req, dir);
1683 __do_request(mdsc, req);
1684
Sage Weile1518c72010-05-13 11:19:06 -07001685 if (req->r_err) {
Sage Weil2f2dc052009-10-06 11:31:09 -07001686 err = req->r_err;
Sage Weile1518c72010-05-13 11:19:06 -07001687 __unregister_request(mdsc, req);
1688 dout("do_request early error %d\n", err);
1689 goto out;
Sage Weil2f2dc052009-10-06 11:31:09 -07001690 }
Sage Weil2f2dc052009-10-06 11:31:09 -07001691
Sage Weile1518c72010-05-13 11:19:06 -07001692 /* wait */
1693 mutex_unlock(&mdsc->mutex);
1694 dout("do_request waiting\n");
1695 if (req->r_timeout) {
1696 err = (long)wait_for_completion_interruptible_timeout(
1697 &req->r_completion, req->r_timeout);
1698 if (err == 0)
1699 err = -EIO;
1700 } else {
1701 err = wait_for_completion_interruptible(&req->r_completion);
1702 }
1703 dout("do_request waited, got %d\n", err);
1704 mutex_lock(&mdsc->mutex);
1705
1706 /* only abort if we didn't race with a real reply */
1707 if (req->r_got_result) {
1708 err = le32_to_cpu(req->r_reply_info.head->result);
1709 } else if (err < 0) {
1710 dout("aborted request %lld with %d\n", req->r_tid, err);
Sage Weilb4556392010-05-13 12:01:13 -07001711
1712 /*
1713 * ensure we aren't running concurrently with
1714 * ceph_fill_trace or ceph_readdir_prepopulate, which
1715 * rely on locks (dir mutex) held by our caller.
1716 */
1717 mutex_lock(&req->r_fill_mutex);
Sage Weile1518c72010-05-13 11:19:06 -07001718 req->r_err = err;
1719 req->r_aborted = true;
Sage Weilb4556392010-05-13 12:01:13 -07001720 mutex_unlock(&req->r_fill_mutex);
Sage Weile1518c72010-05-13 11:19:06 -07001721
1722 if (req->r_locked_dir &&
1723 (req->r_op & CEPH_MDS_OP_WRITE)) {
1724 struct ceph_inode_info *ci =
1725 ceph_inode(req->r_locked_dir);
1726
Sage Weil81a6cf22010-05-14 09:35:38 -07001727 dout("aborted, clearing I_COMPLETE on %p, leases\n",
Sage Weile1518c72010-05-13 11:19:06 -07001728 req->r_locked_dir);
1729 spin_lock(&req->r_locked_dir->i_lock);
1730 ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
1731 ci->i_release_count++;
1732 spin_unlock(&req->r_locked_dir->i_lock);
Sage Weil81a6cf22010-05-14 09:35:38 -07001733
1734 if (req->r_dentry)
1735 ceph_invalidate_dentry_lease(req->r_dentry);
1736 if (req->r_old_dentry)
1737 ceph_invalidate_dentry_lease(req->r_old_dentry);
Sage Weile1518c72010-05-13 11:19:06 -07001738 }
1739 } else {
1740 err = req->r_err;
1741 }
1742
1743out:
1744 mutex_unlock(&mdsc->mutex);
Sage Weil2f2dc052009-10-06 11:31:09 -07001745 dout("do_request %p done, result %d\n", req, err);
1746 return err;
1747}
1748
1749/*
1750 * Handle mds reply.
1751 *
1752 * We take the session mutex and parse and process the reply immediately.
1753 * This preserves the logical ordering of replies, capabilities, etc., sent
1754 * by the MDS as they are applied to our local cache.
1755 */
1756static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
1757{
1758 struct ceph_mds_client *mdsc = session->s_mdsc;
1759 struct ceph_mds_request *req;
1760 struct ceph_mds_reply_head *head = msg->front.iov_base;
1761 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
1762 u64 tid;
1763 int err, result;
Sage Weil2600d2d2010-02-22 15:12:16 -08001764 int mds = session->s_mds;
Sage Weil2f2dc052009-10-06 11:31:09 -07001765
Sage Weil2f2dc052009-10-06 11:31:09 -07001766 if (msg->front.iov_len < sizeof(*head)) {
1767 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
Sage Weil9ec7cab2009-12-14 15:13:47 -08001768 ceph_msg_dump(msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07001769 return;
1770 }
1771
1772 /* get request, session */
Sage Weil6df058c2009-12-22 11:24:33 -08001773 tid = le64_to_cpu(msg->hdr.tid);
Sage Weil2f2dc052009-10-06 11:31:09 -07001774 mutex_lock(&mdsc->mutex);
1775 req = __lookup_request(mdsc, tid);
1776 if (!req) {
1777 dout("handle_reply on unknown tid %llu\n", tid);
1778 mutex_unlock(&mdsc->mutex);
1779 return;
1780 }
1781 dout("handle_reply %p\n", req);
Sage Weil2f2dc052009-10-06 11:31:09 -07001782
1783 /* correct session? */
Sage Weild96d6042010-03-20 20:50:58 -07001784 if (req->r_session != session) {
Sage Weil2f2dc052009-10-06 11:31:09 -07001785 pr_err("mdsc_handle_reply got %llu on session mds%d"
1786 " not mds%d\n", tid, session->s_mds,
1787 req->r_session ? req->r_session->s_mds : -1);
1788 mutex_unlock(&mdsc->mutex);
1789 goto out;
1790 }
1791
1792 /* dup? */
1793 if ((req->r_got_unsafe && !head->safe) ||
1794 (req->r_got_safe && head->safe)) {
1795 pr_warning("got a dup %s reply on %llu from mds%d\n",
1796 head->safe ? "safe" : "unsafe", tid, mds);
1797 mutex_unlock(&mdsc->mutex);
1798 goto out;
1799 }
1800
1801 result = le32_to_cpu(head->result);
1802
1803 /*
1804 * Tolerate 2 consecutive ESTALEs from the same mds.
1805 * FIXME: we should be looking at the cap migrate_seq.
1806 */
1807 if (result == -ESTALE) {
1808 req->r_direct_mode = USE_AUTH_MDS;
1809 req->r_num_stale++;
1810 if (req->r_num_stale <= 2) {
1811 __do_request(mdsc, req);
1812 mutex_unlock(&mdsc->mutex);
1813 goto out;
1814 }
1815 } else {
1816 req->r_num_stale = 0;
1817 }
1818
1819 if (head->safe) {
1820 req->r_got_safe = true;
1821 __unregister_request(mdsc, req);
1822 complete(&req->r_safe_completion);
1823
1824 if (req->r_got_unsafe) {
1825 /*
1826 * We already handled the unsafe response, now do the
1827 * cleanup. No need to examine the response; the MDS
1828 * doesn't include any result info in the safe
1829 * response. And even if it did, there is nothing
1830 * useful we could do with a revised return value.
1831 */
1832 dout("got safe reply %llu, mds%d\n", tid, mds);
1833 list_del_init(&req->r_unsafe_item);
1834
1835 /* last unsafe request during umount? */
Sage Weil44ca18f2010-02-15 12:08:46 -08001836 if (mdsc->stopping && !__get_oldest_req(mdsc))
Sage Weil2f2dc052009-10-06 11:31:09 -07001837 complete(&mdsc->safe_umount_waiters);
1838 mutex_unlock(&mdsc->mutex);
1839 goto out;
1840 }
Sage Weile1518c72010-05-13 11:19:06 -07001841 } else {
Sage Weil2f2dc052009-10-06 11:31:09 -07001842 req->r_got_unsafe = true;
1843 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
1844 }
1845
1846 dout("handle_reply tid %lld result %d\n", tid, result);
1847 rinfo = &req->r_reply_info;
1848 err = parse_reply_info(msg, rinfo);
1849 mutex_unlock(&mdsc->mutex);
1850
1851 mutex_lock(&session->s_mutex);
1852 if (err < 0) {
1853 pr_err("mdsc_handle_reply got corrupt reply mds%d\n", mds);
Sage Weil9ec7cab2009-12-14 15:13:47 -08001854 ceph_msg_dump(msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07001855 goto out_err;
1856 }
1857
1858 /* snap trace */
1859 if (rinfo->snapblob_len) {
1860 down_write(&mdsc->snap_rwsem);
1861 ceph_update_snap_trace(mdsc, rinfo->snapblob,
1862 rinfo->snapblob + rinfo->snapblob_len,
1863 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
1864 downgrade_write(&mdsc->snap_rwsem);
1865 } else {
1866 down_read(&mdsc->snap_rwsem);
1867 }
1868
1869 /* insert trace into our cache */
Sage Weilb4556392010-05-13 12:01:13 -07001870 mutex_lock(&req->r_fill_mutex);
Sage Weil2f2dc052009-10-06 11:31:09 -07001871 err = ceph_fill_trace(mdsc->client->sb, req, req->r_session);
1872 if (err == 0) {
1873 if (result == 0 && rinfo->dir_nr)
1874 ceph_readdir_prepopulate(req, req->r_session);
1875 ceph_unreserve_caps(&req->r_caps_reservation);
1876 }
Sage Weilb4556392010-05-13 12:01:13 -07001877 mutex_unlock(&req->r_fill_mutex);
Sage Weil2f2dc052009-10-06 11:31:09 -07001878
1879 up_read(&mdsc->snap_rwsem);
1880out_err:
Sage Weile1518c72010-05-13 11:19:06 -07001881 mutex_lock(&mdsc->mutex);
1882 if (!req->r_aborted) {
1883 if (err) {
1884 req->r_err = err;
1885 } else {
1886 req->r_reply = msg;
1887 ceph_msg_get(msg);
1888 req->r_got_result = true;
1889 }
Sage Weil2f2dc052009-10-06 11:31:09 -07001890 } else {
Sage Weile1518c72010-05-13 11:19:06 -07001891 dout("reply arrived after request %lld was aborted\n", tid);
Sage Weil2f2dc052009-10-06 11:31:09 -07001892 }
Sage Weile1518c72010-05-13 11:19:06 -07001893 mutex_unlock(&mdsc->mutex);
Sage Weil2f2dc052009-10-06 11:31:09 -07001894
1895 add_cap_releases(mdsc, req->r_session, -1);
1896 mutex_unlock(&session->s_mutex);
1897
1898 /* kick calling process */
1899 complete_request(mdsc, req);
1900out:
1901 ceph_mdsc_put_request(req);
1902 return;
1903}
1904
1905
1906
1907/*
1908 * handle mds notification that our request has been forwarded.
1909 */
Sage Weil2600d2d2010-02-22 15:12:16 -08001910static void handle_forward(struct ceph_mds_client *mdsc,
1911 struct ceph_mds_session *session,
1912 struct ceph_msg *msg)
Sage Weil2f2dc052009-10-06 11:31:09 -07001913{
1914 struct ceph_mds_request *req;
Sage Weila1ea7872010-02-23 14:02:44 -08001915 u64 tid = le64_to_cpu(msg->hdr.tid);
Sage Weil2f2dc052009-10-06 11:31:09 -07001916 u32 next_mds;
1917 u32 fwd_seq;
Sage Weil2f2dc052009-10-06 11:31:09 -07001918 int err = -EINVAL;
1919 void *p = msg->front.iov_base;
1920 void *end = p + msg->front.iov_len;
Sage Weil2f2dc052009-10-06 11:31:09 -07001921
Sage Weila1ea7872010-02-23 14:02:44 -08001922 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
Sage Weilc89136e2009-10-14 09:59:09 -07001923 next_mds = ceph_decode_32(&p);
1924 fwd_seq = ceph_decode_32(&p);
Sage Weil2f2dc052009-10-06 11:31:09 -07001925
1926 mutex_lock(&mdsc->mutex);
1927 req = __lookup_request(mdsc, tid);
1928 if (!req) {
Sage Weil080af172010-02-25 16:40:07 -08001929 dout("forward %llu to mds%d - req dne\n", tid, next_mds);
Sage Weil2f2dc052009-10-06 11:31:09 -07001930 goto out; /* dup reply? */
1931 }
1932
Sage Weil2f2dc052009-10-06 11:31:09 -07001933 if (fwd_seq <= req->r_num_fwd) {
1934 dout("forward %llu to mds%d - old seq %d <= %d\n",
1935 tid, next_mds, req->r_num_fwd, fwd_seq);
1936 } else {
1937 /* resend. forward race not possible; mds would drop */
1938 dout("forward %llu to mds%d (we resend)\n", tid, next_mds);
1939 req->r_num_fwd = fwd_seq;
1940 req->r_resend_mds = next_mds;
1941 put_request_session(req);
1942 __do_request(mdsc, req);
1943 }
1944 ceph_mdsc_put_request(req);
1945out:
1946 mutex_unlock(&mdsc->mutex);
1947 return;
1948
1949bad:
1950 pr_err("mdsc_handle_forward decode error err=%d\n", err);
1951}
1952
1953/*
1954 * handle a mds session control message
1955 */
1956static void handle_session(struct ceph_mds_session *session,
1957 struct ceph_msg *msg)
1958{
1959 struct ceph_mds_client *mdsc = session->s_mdsc;
1960 u32 op;
1961 u64 seq;
Sage Weil2600d2d2010-02-22 15:12:16 -08001962 int mds = session->s_mds;
Sage Weil2f2dc052009-10-06 11:31:09 -07001963 struct ceph_mds_session_head *h = msg->front.iov_base;
1964 int wake = 0;
1965
Sage Weil2f2dc052009-10-06 11:31:09 -07001966 /* decode */
1967 if (msg->front.iov_len != sizeof(*h))
1968 goto bad;
1969 op = le32_to_cpu(h->op);
1970 seq = le64_to_cpu(h->seq);
1971
1972 mutex_lock(&mdsc->mutex);
Sage Weil2600d2d2010-02-22 15:12:16 -08001973 if (op == CEPH_SESSION_CLOSE)
1974 __unregister_session(mdsc, session);
Sage Weil2f2dc052009-10-06 11:31:09 -07001975 /* FIXME: this ttl calculation is generous */
1976 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
1977 mutex_unlock(&mdsc->mutex);
1978
1979 mutex_lock(&session->s_mutex);
1980
1981 dout("handle_session mds%d %s %p state %s seq %llu\n",
1982 mds, ceph_session_op_name(op), session,
1983 session_state_name(session->s_state), seq);
1984
1985 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
1986 session->s_state = CEPH_MDS_SESSION_OPEN;
1987 pr_info("mds%d came back\n", session->s_mds);
1988 }
1989
1990 switch (op) {
1991 case CEPH_SESSION_OPEN:
1992 session->s_state = CEPH_MDS_SESSION_OPEN;
1993 renewed_caps(mdsc, session, 0);
1994 wake = 1;
1995 if (mdsc->stopping)
1996 __close_session(mdsc, session);
1997 break;
1998
1999 case CEPH_SESSION_RENEWCAPS:
2000 if (session->s_renew_seq == seq)
2001 renewed_caps(mdsc, session, 1);
2002 break;
2003
2004 case CEPH_SESSION_CLOSE:
Sage Weil2f2dc052009-10-06 11:31:09 -07002005 remove_session_caps(session);
2006 wake = 1; /* for good measure */
2007 complete(&mdsc->session_close_waiters);
2008 kick_requests(mdsc, mds, 0); /* cur only */
2009 break;
2010
2011 case CEPH_SESSION_STALE:
2012 pr_info("mds%d caps went stale, renewing\n",
2013 session->s_mds);
2014 spin_lock(&session->s_cap_lock);
2015 session->s_cap_gen++;
2016 session->s_cap_ttl = 0;
2017 spin_unlock(&session->s_cap_lock);
2018 send_renew_caps(mdsc, session);
2019 break;
2020
2021 case CEPH_SESSION_RECALL_STATE:
2022 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2023 break;
2024
2025 default:
2026 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2027 WARN_ON(1);
2028 }
2029
2030 mutex_unlock(&session->s_mutex);
2031 if (wake) {
2032 mutex_lock(&mdsc->mutex);
2033 __wake_requests(mdsc, &session->s_waiting);
2034 mutex_unlock(&mdsc->mutex);
2035 }
2036 return;
2037
2038bad:
2039 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2040 (int)msg->front.iov_len);
Sage Weil9ec7cab2009-12-14 15:13:47 -08002041 ceph_msg_dump(msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07002042 return;
2043}
2044
2045
2046/*
2047 * called under session->mutex.
2048 */
2049static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2050 struct ceph_mds_session *session)
2051{
2052 struct ceph_mds_request *req, *nreq;
2053 int err;
2054
2055 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2056
2057 mutex_lock(&mdsc->mutex);
2058 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2059 err = __prepare_send_request(mdsc, req, session->s_mds);
2060 if (!err) {
2061 ceph_msg_get(req->r_request);
2062 ceph_con_send(&session->s_con, req->r_request);
2063 }
2064 }
2065 mutex_unlock(&mdsc->mutex);
2066}
2067
2068/*
2069 * Encode information about a cap for a reconnect with the MDS.
2070 */
Sage Weil2f2dc052009-10-06 11:31:09 -07002071static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2072 void *arg)
2073{
Sage Weil93cea5b2009-12-23 12:21:51 -08002074 struct ceph_mds_cap_reconnect rec;
Sage Weil2f2dc052009-10-06 11:31:09 -07002075 struct ceph_inode_info *ci;
Sage Weil93cea5b2009-12-23 12:21:51 -08002076 struct ceph_pagelist *pagelist = arg;
Sage Weil2f2dc052009-10-06 11:31:09 -07002077 char *path;
2078 int pathlen, err;
2079 u64 pathbase;
2080 struct dentry *dentry;
2081
2082 ci = cap->ci;
2083
2084 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2085 inode, ceph_vinop(inode), cap, cap->cap_id,
2086 ceph_cap_string(cap->issued));
Sage Weil93cea5b2009-12-23 12:21:51 -08002087 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2088 if (err)
2089 return err;
Sage Weil2f2dc052009-10-06 11:31:09 -07002090
2091 dentry = d_find_alias(inode);
2092 if (dentry) {
2093 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2094 if (IS_ERR(path)) {
2095 err = PTR_ERR(path);
2096 BUG_ON(err);
2097 }
2098 } else {
2099 path = NULL;
2100 pathlen = 0;
2101 }
Sage Weil93cea5b2009-12-23 12:21:51 -08002102 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2103 if (err)
2104 goto out;
Sage Weil2f2dc052009-10-06 11:31:09 -07002105
Sage Weil2f2dc052009-10-06 11:31:09 -07002106 spin_lock(&inode->i_lock);
2107 cap->seq = 0; /* reset cap seq */
2108 cap->issue_seq = 0; /* and issue_seq */
Sage Weil93cea5b2009-12-23 12:21:51 -08002109 rec.cap_id = cpu_to_le64(cap->cap_id);
2110 rec.pathbase = cpu_to_le64(pathbase);
2111 rec.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2112 rec.issued = cpu_to_le32(cap->issued);
2113 rec.size = cpu_to_le64(inode->i_size);
2114 ceph_encode_timespec(&rec.mtime, &inode->i_mtime);
2115 ceph_encode_timespec(&rec.atime, &inode->i_atime);
2116 rec.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
Sage Weil2f2dc052009-10-06 11:31:09 -07002117 spin_unlock(&inode->i_lock);
2118
Sage Weil93cea5b2009-12-23 12:21:51 -08002119 err = ceph_pagelist_append(pagelist, &rec, sizeof(rec));
2120
2121out:
Sage Weil2f2dc052009-10-06 11:31:09 -07002122 kfree(path);
2123 dput(dentry);
Sage Weil93cea5b2009-12-23 12:21:51 -08002124 return err;
Sage Weil2f2dc052009-10-06 11:31:09 -07002125}
2126
2127
2128/*
2129 * If an MDS fails and recovers, clients need to reconnect in order to
2130 * reestablish shared state. This includes all caps issued through
2131 * this session _and_ the snap_realm hierarchy. Because it's not
2132 * clear which snap realms the mds cares about, we send everything we
2133 * know about.. that ensures we'll then get any new info the
2134 * recovering MDS might have.
2135 *
2136 * This is a relatively heavyweight operation, but it's rare.
2137 *
2138 * called with mdsc->mutex held.
2139 */
2140static void send_mds_reconnect(struct ceph_mds_client *mdsc, int mds)
2141{
Sage Weil93cea5b2009-12-23 12:21:51 -08002142 struct ceph_mds_session *session = NULL;
Sage Weil2f2dc052009-10-06 11:31:09 -07002143 struct ceph_msg *reply;
Sage Weila105f002010-02-15 14:37:55 -08002144 struct rb_node *p;
Sage Weil9abf82b2010-05-10 21:58:38 -07002145 int err = -ENOMEM;
Sage Weil93cea5b2009-12-23 12:21:51 -08002146 struct ceph_pagelist *pagelist;
Sage Weil2f2dc052009-10-06 11:31:09 -07002147
2148 pr_info("reconnect to recovering mds%d\n", mds);
2149
Sage Weil93cea5b2009-12-23 12:21:51 -08002150 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2151 if (!pagelist)
2152 goto fail_nopagelist;
2153 ceph_pagelist_init(pagelist);
2154
Sage Weila79832f2010-04-01 16:06:19 -07002155 err = -ENOMEM;
Sage Weilbb257662010-04-01 16:07:23 -07002156 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0);
Sage Weila79832f2010-04-01 16:06:19 -07002157 if (!reply)
Sage Weil93cea5b2009-12-23 12:21:51 -08002158 goto fail_nomsg;
Sage Weil93cea5b2009-12-23 12:21:51 -08002159
Sage Weil2f2dc052009-10-06 11:31:09 -07002160 /* find session */
2161 session = __ceph_lookup_mds_session(mdsc, mds);
2162 mutex_unlock(&mdsc->mutex); /* drop lock for duration */
2163
2164 if (session) {
2165 mutex_lock(&session->s_mutex);
2166
2167 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2168 session->s_seq = 0;
2169
2170 ceph_con_open(&session->s_con,
2171 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2172
2173 /* replay unsafe requests */
2174 replay_unsafe_requests(mdsc, session);
Sage Weil2f2dc052009-10-06 11:31:09 -07002175 } else {
2176 dout("no session for mds%d, will send short reconnect\n",
2177 mds);
2178 }
2179
2180 down_read(&mdsc->snap_rwsem);
2181
Sage Weil93cea5b2009-12-23 12:21:51 -08002182 if (!session)
Sage Weil2f2dc052009-10-06 11:31:09 -07002183 goto send;
Sage Weil2f2dc052009-10-06 11:31:09 -07002184 dout("session %p state %s\n", session,
2185 session_state_name(session->s_state));
2186
2187 /* traverse this session's caps */
Sage Weil93cea5b2009-12-23 12:21:51 -08002188 err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps);
2189 if (err)
2190 goto fail;
2191 err = iterate_session_caps(session, encode_caps_cb, pagelist);
Sage Weil2f2dc052009-10-06 11:31:09 -07002192 if (err < 0)
Sage Weil9abf82b2010-05-10 21:58:38 -07002193 goto fail;
Sage Weil2f2dc052009-10-06 11:31:09 -07002194
2195 /*
2196 * snaprealms. we provide mds with the ino, seq (version), and
2197 * parent for all of our realms. If the mds has any newer info,
2198 * it will tell us.
2199 */
Sage Weila105f002010-02-15 14:37:55 -08002200 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2201 struct ceph_snap_realm *realm =
2202 rb_entry(p, struct ceph_snap_realm, node);
Sage Weil93cea5b2009-12-23 12:21:51 -08002203 struct ceph_mds_snaprealm_reconnect sr_rec;
Sage Weil2f2dc052009-10-06 11:31:09 -07002204
2205 dout(" adding snap realm %llx seq %lld parent %llx\n",
2206 realm->ino, realm->seq, realm->parent_ino);
Sage Weil93cea5b2009-12-23 12:21:51 -08002207 sr_rec.ino = cpu_to_le64(realm->ino);
2208 sr_rec.seq = cpu_to_le64(realm->seq);
2209 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2210 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2211 if (err)
2212 goto fail;
Sage Weil2f2dc052009-10-06 11:31:09 -07002213 }
Sage Weil2f2dc052009-10-06 11:31:09 -07002214
2215send:
Sage Weil93cea5b2009-12-23 12:21:51 -08002216 reply->pagelist = pagelist;
2217 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2218 reply->nr_pages = calc_pages_for(0, pagelist->length);
Sage Weil2f2dc052009-10-06 11:31:09 -07002219 ceph_con_send(&session->s_con, reply);
2220
Sage Weil9abf82b2010-05-10 21:58:38 -07002221 session->s_state = CEPH_MDS_SESSION_OPEN;
2222 mutex_unlock(&session->s_mutex);
Sage Weil2f2dc052009-10-06 11:31:09 -07002223
Sage Weil9abf82b2010-05-10 21:58:38 -07002224 mutex_lock(&mdsc->mutex);
2225 __wake_requests(mdsc, &session->s_waiting);
2226 mutex_unlock(&mdsc->mutex);
2227
2228 ceph_put_mds_session(session);
2229
Sage Weil2f2dc052009-10-06 11:31:09 -07002230 up_read(&mdsc->snap_rwsem);
Sage Weil2f2dc052009-10-06 11:31:09 -07002231 mutex_lock(&mdsc->mutex);
2232 return;
2233
Sage Weil93cea5b2009-12-23 12:21:51 -08002234fail:
Sage Weil2f2dc052009-10-06 11:31:09 -07002235 ceph_msg_put(reply);
Sage Weil9abf82b2010-05-10 21:58:38 -07002236 up_read(&mdsc->snap_rwsem);
2237 mutex_unlock(&session->s_mutex);
2238 ceph_put_mds_session(session);
Sage Weil93cea5b2009-12-23 12:21:51 -08002239fail_nomsg:
2240 ceph_pagelist_release(pagelist);
2241 kfree(pagelist);
2242fail_nopagelist:
Sage Weil9abf82b2010-05-10 21:58:38 -07002243 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
2244 mutex_lock(&mdsc->mutex);
2245 return;
Sage Weil2f2dc052009-10-06 11:31:09 -07002246}
2247
2248
2249/*
2250 * compare old and new mdsmaps, kicking requests
2251 * and closing out old connections as necessary
2252 *
2253 * called under mdsc->mutex.
2254 */
2255static void check_new_map(struct ceph_mds_client *mdsc,
2256 struct ceph_mdsmap *newmap,
2257 struct ceph_mdsmap *oldmap)
2258{
2259 int i;
2260 int oldstate, newstate;
2261 struct ceph_mds_session *s;
2262
2263 dout("check_new_map new %u old %u\n",
2264 newmap->m_epoch, oldmap->m_epoch);
2265
2266 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2267 if (mdsc->sessions[i] == NULL)
2268 continue;
2269 s = mdsc->sessions[i];
2270 oldstate = ceph_mdsmap_get_state(oldmap, i);
2271 newstate = ceph_mdsmap_get_state(newmap, i);
2272
2273 dout("check_new_map mds%d state %s -> %s (session %s)\n",
2274 i, ceph_mds_state_name(oldstate),
2275 ceph_mds_state_name(newstate),
2276 session_state_name(s->s_state));
2277
2278 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
2279 ceph_mdsmap_get_addr(newmap, i),
2280 sizeof(struct ceph_entity_addr))) {
2281 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2282 /* the session never opened, just close it
2283 * out now */
2284 __wake_requests(mdsc, &s->s_waiting);
Sage Weil2600d2d2010-02-22 15:12:16 -08002285 __unregister_session(mdsc, s);
Sage Weil2f2dc052009-10-06 11:31:09 -07002286 } else {
2287 /* just close it */
2288 mutex_unlock(&mdsc->mutex);
2289 mutex_lock(&s->s_mutex);
2290 mutex_lock(&mdsc->mutex);
2291 ceph_con_close(&s->s_con);
2292 mutex_unlock(&s->s_mutex);
2293 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2294 }
2295
2296 /* kick any requests waiting on the recovering mds */
2297 kick_requests(mdsc, i, 1);
2298 } else if (oldstate == newstate) {
2299 continue; /* nothing new with this mds */
2300 }
2301
2302 /*
2303 * send reconnect?
2304 */
2305 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
2306 newstate >= CEPH_MDS_STATE_RECONNECT)
2307 send_mds_reconnect(mdsc, i);
2308
2309 /*
2310 * kick requests on any mds that has gone active.
2311 *
2312 * kick requests on cur or forwarder: we may have sent
2313 * the request to mds1, mds1 told us it forwarded it
2314 * to mds2, but then we learn mds1 failed and can't be
2315 * sure it successfully forwarded our request before
2316 * it died.
2317 */
2318 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
2319 newstate >= CEPH_MDS_STATE_ACTIVE) {
Sage Weilfef320f2009-11-11 15:50:12 -08002320 pr_info("mds%d reconnect completed\n", s->s_mds);
Sage Weil2f2dc052009-10-06 11:31:09 -07002321 kick_requests(mdsc, i, 1);
2322 ceph_kick_flushing_caps(mdsc, s);
Sage Weil0dc25702009-11-20 13:43:45 -08002323 wake_up_session_caps(s, 1);
Sage Weil2f2dc052009-10-06 11:31:09 -07002324 }
2325 }
2326}
2327
2328
2329
2330/*
2331 * leases
2332 */
2333
2334/*
2335 * caller must hold session s_mutex, dentry->d_lock
2336 */
2337void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
2338{
2339 struct ceph_dentry_info *di = ceph_dentry(dentry);
2340
2341 ceph_put_mds_session(di->lease_session);
2342 di->lease_session = NULL;
2343}
2344
Sage Weil2600d2d2010-02-22 15:12:16 -08002345static void handle_lease(struct ceph_mds_client *mdsc,
2346 struct ceph_mds_session *session,
2347 struct ceph_msg *msg)
Sage Weil2f2dc052009-10-06 11:31:09 -07002348{
2349 struct super_block *sb = mdsc->client->sb;
2350 struct inode *inode;
Sage Weil2f2dc052009-10-06 11:31:09 -07002351 struct ceph_inode_info *ci;
2352 struct dentry *parent, *dentry;
2353 struct ceph_dentry_info *di;
Sage Weil2600d2d2010-02-22 15:12:16 -08002354 int mds = session->s_mds;
Sage Weil2f2dc052009-10-06 11:31:09 -07002355 struct ceph_mds_lease *h = msg->front.iov_base;
2356 struct ceph_vino vino;
2357 int mask;
2358 struct qstr dname;
2359 int release = 0;
2360
Sage Weil2f2dc052009-10-06 11:31:09 -07002361 dout("handle_lease from mds%d\n", mds);
2362
2363 /* decode */
2364 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
2365 goto bad;
2366 vino.ino = le64_to_cpu(h->ino);
2367 vino.snap = CEPH_NOSNAP;
2368 mask = le16_to_cpu(h->mask);
2369 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
2370 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
2371 if (dname.len != get_unaligned_le32(h+1))
2372 goto bad;
2373
Sage Weil2f2dc052009-10-06 11:31:09 -07002374 mutex_lock(&session->s_mutex);
2375 session->s_seq++;
2376
2377 /* lookup inode */
2378 inode = ceph_find_inode(sb, vino);
2379 dout("handle_lease '%s', mask %d, ino %llx %p\n",
2380 ceph_lease_op_name(h->action), mask, vino.ino, inode);
2381 if (inode == NULL) {
2382 dout("handle_lease no inode %llx\n", vino.ino);
2383 goto release;
2384 }
2385 ci = ceph_inode(inode);
2386
2387 /* dentry */
2388 parent = d_find_alias(inode);
2389 if (!parent) {
2390 dout("no parent dentry on inode %p\n", inode);
2391 WARN_ON(1);
2392 goto release; /* hrm... */
2393 }
2394 dname.hash = full_name_hash(dname.name, dname.len);
2395 dentry = d_lookup(parent, &dname);
2396 dput(parent);
2397 if (!dentry)
2398 goto release;
2399
2400 spin_lock(&dentry->d_lock);
2401 di = ceph_dentry(dentry);
2402 switch (h->action) {
2403 case CEPH_MDS_LEASE_REVOKE:
2404 if (di && di->lease_session == session) {
2405 h->seq = cpu_to_le32(di->lease_seq);
2406 __ceph_mdsc_drop_dentry_lease(dentry);
2407 }
2408 release = 1;
2409 break;
2410
2411 case CEPH_MDS_LEASE_RENEW:
2412 if (di && di->lease_session == session &&
2413 di->lease_gen == session->s_cap_gen &&
2414 di->lease_renew_from &&
2415 di->lease_renew_after == 0) {
2416 unsigned long duration =
2417 le32_to_cpu(h->duration_ms) * HZ / 1000;
2418
2419 di->lease_seq = le32_to_cpu(h->seq);
2420 dentry->d_time = di->lease_renew_from + duration;
2421 di->lease_renew_after = di->lease_renew_from +
2422 (duration >> 1);
2423 di->lease_renew_from = 0;
2424 }
2425 break;
2426 }
2427 spin_unlock(&dentry->d_lock);
2428 dput(dentry);
2429
2430 if (!release)
2431 goto out;
2432
2433release:
2434 /* let's just reuse the same message */
2435 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
2436 ceph_msg_get(msg);
2437 ceph_con_send(&session->s_con, msg);
2438
2439out:
2440 iput(inode);
2441 mutex_unlock(&session->s_mutex);
Sage Weil2f2dc052009-10-06 11:31:09 -07002442 return;
2443
2444bad:
2445 pr_err("corrupt lease message\n");
Sage Weil9ec7cab2009-12-14 15:13:47 -08002446 ceph_msg_dump(msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07002447}
2448
2449void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2450 struct inode *inode,
2451 struct dentry *dentry, char action,
2452 u32 seq)
2453{
2454 struct ceph_msg *msg;
2455 struct ceph_mds_lease *lease;
2456 int len = sizeof(*lease) + sizeof(u32);
2457 int dnamelen = 0;
2458
2459 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2460 inode, dentry, ceph_lease_op_name(action), session->s_mds);
2461 dnamelen = dentry->d_name.len;
2462 len += dnamelen;
2463
Sage Weilbb257662010-04-01 16:07:23 -07002464 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len);
Sage Weila79832f2010-04-01 16:06:19 -07002465 if (!msg)
Sage Weil2f2dc052009-10-06 11:31:09 -07002466 return;
2467 lease = msg->front.iov_base;
2468 lease->action = action;
2469 lease->mask = cpu_to_le16(CEPH_LOCK_DN);
2470 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
2471 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
2472 lease->seq = cpu_to_le32(seq);
2473 put_unaligned_le32(dnamelen, lease + 1);
2474 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
2475
2476 /*
2477 * if this is a preemptive lease RELEASE, no need to
2478 * flush request stream, since the actual request will
2479 * soon follow.
2480 */
2481 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
2482
2483 ceph_con_send(&session->s_con, msg);
2484}
2485
2486/*
2487 * Preemptively release a lease we expect to invalidate anyway.
2488 * Pass @inode always, @dentry is optional.
2489 */
2490void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2491 struct dentry *dentry, int mask)
2492{
2493 struct ceph_dentry_info *di;
2494 struct ceph_mds_session *session;
2495 u32 seq;
2496
2497 BUG_ON(inode == NULL);
2498 BUG_ON(dentry == NULL);
2499 BUG_ON(mask != CEPH_LOCK_DN);
2500
2501 /* is dentry lease valid? */
2502 spin_lock(&dentry->d_lock);
2503 di = ceph_dentry(dentry);
2504 if (!di || !di->lease_session ||
2505 di->lease_session->s_mds < 0 ||
2506 di->lease_gen != di->lease_session->s_cap_gen ||
2507 !time_before(jiffies, dentry->d_time)) {
2508 dout("lease_release inode %p dentry %p -- "
2509 "no lease on %d\n",
2510 inode, dentry, mask);
2511 spin_unlock(&dentry->d_lock);
2512 return;
2513 }
2514
2515 /* we do have a lease on this dentry; note mds and seq */
2516 session = ceph_get_mds_session(di->lease_session);
2517 seq = di->lease_seq;
2518 __ceph_mdsc_drop_dentry_lease(dentry);
2519 spin_unlock(&dentry->d_lock);
2520
2521 dout("lease_release inode %p dentry %p mask %d to mds%d\n",
2522 inode, dentry, mask, session->s_mds);
2523 ceph_mdsc_lease_send_msg(session, inode, dentry,
2524 CEPH_MDS_LEASE_RELEASE, seq);
2525 ceph_put_mds_session(session);
2526}
2527
2528/*
2529 * drop all leases (and dentry refs) in preparation for umount
2530 */
2531static void drop_leases(struct ceph_mds_client *mdsc)
2532{
2533 int i;
2534
2535 dout("drop_leases\n");
2536 mutex_lock(&mdsc->mutex);
2537 for (i = 0; i < mdsc->max_sessions; i++) {
2538 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2539 if (!s)
2540 continue;
2541 mutex_unlock(&mdsc->mutex);
2542 mutex_lock(&s->s_mutex);
2543 mutex_unlock(&s->s_mutex);
2544 ceph_put_mds_session(s);
2545 mutex_lock(&mdsc->mutex);
2546 }
2547 mutex_unlock(&mdsc->mutex);
2548}
2549
2550
2551
2552/*
2553 * delayed work -- periodically trim expired leases, renew caps with mds
2554 */
2555static void schedule_delayed(struct ceph_mds_client *mdsc)
2556{
2557 int delay = 5;
2558 unsigned hz = round_jiffies_relative(HZ * delay);
2559 schedule_delayed_work(&mdsc->delayed_work, hz);
2560}
2561
2562static void delayed_work(struct work_struct *work)
2563{
2564 int i;
2565 struct ceph_mds_client *mdsc =
2566 container_of(work, struct ceph_mds_client, delayed_work.work);
2567 int renew_interval;
2568 int renew_caps;
2569
2570 dout("mdsc delayed_work\n");
Sage Weilafcdaea2009-10-14 14:27:38 -07002571 ceph_check_delayed_caps(mdsc);
Sage Weil2f2dc052009-10-06 11:31:09 -07002572
2573 mutex_lock(&mdsc->mutex);
2574 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
2575 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
2576 mdsc->last_renew_caps);
2577 if (renew_caps)
2578 mdsc->last_renew_caps = jiffies;
2579
2580 for (i = 0; i < mdsc->max_sessions; i++) {
2581 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2582 if (s == NULL)
2583 continue;
2584 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
2585 dout("resending session close request for mds%d\n",
2586 s->s_mds);
2587 request_close_session(mdsc, s);
2588 ceph_put_mds_session(s);
2589 continue;
2590 }
2591 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
2592 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
2593 s->s_state = CEPH_MDS_SESSION_HUNG;
2594 pr_info("mds%d hung\n", s->s_mds);
2595 }
2596 }
2597 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
2598 /* this mds is failed or recovering, just wait */
2599 ceph_put_mds_session(s);
2600 continue;
2601 }
2602 mutex_unlock(&mdsc->mutex);
2603
2604 mutex_lock(&s->s_mutex);
2605 if (renew_caps)
2606 send_renew_caps(mdsc, s);
2607 else
2608 ceph_con_keepalive(&s->s_con);
2609 add_cap_releases(mdsc, s, -1);
2610 send_cap_releases(mdsc, s);
2611 mutex_unlock(&s->s_mutex);
2612 ceph_put_mds_session(s);
2613
2614 mutex_lock(&mdsc->mutex);
2615 }
2616 mutex_unlock(&mdsc->mutex);
2617
2618 schedule_delayed(mdsc);
2619}
2620
2621
Sage Weil5f44f142009-11-18 14:52:18 -08002622int ceph_mdsc_init(struct ceph_mds_client *mdsc, struct ceph_client *client)
Sage Weil2f2dc052009-10-06 11:31:09 -07002623{
2624 mdsc->client = client;
2625 mutex_init(&mdsc->mutex);
2626 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
Cheng Renquan2d06eeb2010-03-26 18:04:40 +08002627 if (mdsc->mdsmap == NULL)
2628 return -ENOMEM;
2629
Sage Weil2f2dc052009-10-06 11:31:09 -07002630 init_completion(&mdsc->safe_umount_waiters);
2631 init_completion(&mdsc->session_close_waiters);
2632 INIT_LIST_HEAD(&mdsc->waiting_for_map);
2633 mdsc->sessions = NULL;
2634 mdsc->max_sessions = 0;
2635 mdsc->stopping = 0;
2636 init_rwsem(&mdsc->snap_rwsem);
Sage Weila105f002010-02-15 14:37:55 -08002637 mdsc->snap_realms = RB_ROOT;
Sage Weil2f2dc052009-10-06 11:31:09 -07002638 INIT_LIST_HEAD(&mdsc->snap_empty);
2639 spin_lock_init(&mdsc->snap_empty_lock);
2640 mdsc->last_tid = 0;
Sage Weil44ca18f2010-02-15 12:08:46 -08002641 mdsc->request_tree = RB_ROOT;
Sage Weil2f2dc052009-10-06 11:31:09 -07002642 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
2643 mdsc->last_renew_caps = jiffies;
2644 INIT_LIST_HEAD(&mdsc->cap_delay_list);
2645 spin_lock_init(&mdsc->cap_delay_lock);
2646 INIT_LIST_HEAD(&mdsc->snap_flush_list);
2647 spin_lock_init(&mdsc->snap_flush_lock);
2648 mdsc->cap_flush_seq = 0;
2649 INIT_LIST_HEAD(&mdsc->cap_dirty);
2650 mdsc->num_cap_flushing = 0;
2651 spin_lock_init(&mdsc->cap_dirty_lock);
2652 init_waitqueue_head(&mdsc->cap_flushing_wq);
2653 spin_lock_init(&mdsc->dentry_lru_lock);
2654 INIT_LIST_HEAD(&mdsc->dentry_lru);
Cheng Renquan2d06eeb2010-03-26 18:04:40 +08002655
Sage Weil5f44f142009-11-18 14:52:18 -08002656 return 0;
Sage Weil2f2dc052009-10-06 11:31:09 -07002657}
2658
2659/*
2660 * Wait for safe replies on open mds requests. If we time out, drop
2661 * all requests from the tree to avoid dangling dentry refs.
2662 */
2663static void wait_requests(struct ceph_mds_client *mdsc)
2664{
2665 struct ceph_mds_request *req;
2666 struct ceph_client *client = mdsc->client;
2667
2668 mutex_lock(&mdsc->mutex);
Sage Weil44ca18f2010-02-15 12:08:46 -08002669 if (__get_oldest_req(mdsc)) {
Sage Weil2f2dc052009-10-06 11:31:09 -07002670 mutex_unlock(&mdsc->mutex);
Sage Weil44ca18f2010-02-15 12:08:46 -08002671
Sage Weil2f2dc052009-10-06 11:31:09 -07002672 dout("wait_requests waiting for requests\n");
2673 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
Sage Weil6b805182009-10-27 11:50:50 -07002674 client->mount_args->mount_timeout * HZ);
Sage Weil2f2dc052009-10-06 11:31:09 -07002675
2676 /* tear down remaining requests */
Sage Weil44ca18f2010-02-15 12:08:46 -08002677 mutex_lock(&mdsc->mutex);
2678 while ((req = __get_oldest_req(mdsc))) {
Sage Weil2f2dc052009-10-06 11:31:09 -07002679 dout("wait_requests timed out on tid %llu\n",
2680 req->r_tid);
Sage Weil44ca18f2010-02-15 12:08:46 -08002681 __unregister_request(mdsc, req);
Sage Weil2f2dc052009-10-06 11:31:09 -07002682 }
2683 }
2684 mutex_unlock(&mdsc->mutex);
2685 dout("wait_requests done\n");
2686}
2687
2688/*
2689 * called before mount is ro, and before dentries are torn down.
2690 * (hmm, does this still race with new lookups?)
2691 */
2692void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
2693{
2694 dout("pre_umount\n");
2695 mdsc->stopping = 1;
2696
2697 drop_leases(mdsc);
Sage Weilafcdaea2009-10-14 14:27:38 -07002698 ceph_flush_dirty_caps(mdsc);
Sage Weil2f2dc052009-10-06 11:31:09 -07002699 wait_requests(mdsc);
2700}
2701
2702/*
2703 * wait for all write mds requests to flush.
2704 */
2705static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
2706{
Sage Weil80fc7312010-03-16 15:28:54 -07002707 struct ceph_mds_request *req = NULL, *nextreq;
Sage Weil44ca18f2010-02-15 12:08:46 -08002708 struct rb_node *n;
Sage Weil2f2dc052009-10-06 11:31:09 -07002709
2710 mutex_lock(&mdsc->mutex);
2711 dout("wait_unsafe_requests want %lld\n", want_tid);
Sage Weil80fc7312010-03-16 15:28:54 -07002712restart:
Sage Weil44ca18f2010-02-15 12:08:46 -08002713 req = __get_oldest_req(mdsc);
2714 while (req && req->r_tid <= want_tid) {
Sage Weil80fc7312010-03-16 15:28:54 -07002715 /* find next request */
2716 n = rb_next(&req->r_node);
2717 if (n)
2718 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
2719 else
2720 nextreq = NULL;
Sage Weil44ca18f2010-02-15 12:08:46 -08002721 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
2722 /* write op */
2723 ceph_mdsc_get_request(req);
Sage Weil80fc7312010-03-16 15:28:54 -07002724 if (nextreq)
2725 ceph_mdsc_get_request(nextreq);
Sage Weil44ca18f2010-02-15 12:08:46 -08002726 mutex_unlock(&mdsc->mutex);
2727 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
2728 req->r_tid, want_tid);
2729 wait_for_completion(&req->r_safe_completion);
2730 mutex_lock(&mdsc->mutex);
Sage Weil44ca18f2010-02-15 12:08:46 -08002731 ceph_mdsc_put_request(req);
Sage Weil80fc7312010-03-16 15:28:54 -07002732 if (!nextreq)
2733 break; /* next dne before, so we're done! */
2734 if (RB_EMPTY_NODE(&nextreq->r_node)) {
2735 /* next request was removed from tree */
2736 ceph_mdsc_put_request(nextreq);
2737 goto restart;
2738 }
2739 ceph_mdsc_put_request(nextreq); /* won't go away */
Sage Weil44ca18f2010-02-15 12:08:46 -08002740 }
Sage Weil80fc7312010-03-16 15:28:54 -07002741 req = nextreq;
Sage Weil2f2dc052009-10-06 11:31:09 -07002742 }
2743 mutex_unlock(&mdsc->mutex);
2744 dout("wait_unsafe_requests done\n");
2745}
2746
2747void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
2748{
2749 u64 want_tid, want_flush;
2750
2751 dout("sync\n");
2752 mutex_lock(&mdsc->mutex);
2753 want_tid = mdsc->last_tid;
2754 want_flush = mdsc->cap_flush_seq;
2755 mutex_unlock(&mdsc->mutex);
2756 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
2757
Sage Weilafcdaea2009-10-14 14:27:38 -07002758 ceph_flush_dirty_caps(mdsc);
Sage Weil2f2dc052009-10-06 11:31:09 -07002759
2760 wait_unsafe_requests(mdsc, want_tid);
2761 wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
2762}
2763
2764
2765/*
2766 * called after sb is ro.
2767 */
2768void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
2769{
2770 struct ceph_mds_session *session;
2771 int i;
2772 int n;
2773 struct ceph_client *client = mdsc->client;
Sage Weil6b805182009-10-27 11:50:50 -07002774 unsigned long started, timeout = client->mount_args->mount_timeout * HZ;
Sage Weil2f2dc052009-10-06 11:31:09 -07002775
2776 dout("close_sessions\n");
2777
2778 mutex_lock(&mdsc->mutex);
2779
2780 /* close sessions */
2781 started = jiffies;
2782 while (time_before(jiffies, started + timeout)) {
2783 dout("closing sessions\n");
2784 n = 0;
2785 for (i = 0; i < mdsc->max_sessions; i++) {
2786 session = __ceph_lookup_mds_session(mdsc, i);
2787 if (!session)
2788 continue;
2789 mutex_unlock(&mdsc->mutex);
2790 mutex_lock(&session->s_mutex);
2791 __close_session(mdsc, session);
2792 mutex_unlock(&session->s_mutex);
2793 ceph_put_mds_session(session);
2794 mutex_lock(&mdsc->mutex);
2795 n++;
2796 }
2797 if (n == 0)
2798 break;
2799
2800 if (client->mount_state == CEPH_MOUNT_SHUTDOWN)
2801 break;
2802
2803 dout("waiting for sessions to close\n");
2804 mutex_unlock(&mdsc->mutex);
2805 wait_for_completion_timeout(&mdsc->session_close_waiters,
2806 timeout);
2807 mutex_lock(&mdsc->mutex);
2808 }
2809
2810 /* tear down remaining sessions */
2811 for (i = 0; i < mdsc->max_sessions; i++) {
2812 if (mdsc->sessions[i]) {
2813 session = get_session(mdsc->sessions[i]);
Sage Weil2600d2d2010-02-22 15:12:16 -08002814 __unregister_session(mdsc, session);
Sage Weil2f2dc052009-10-06 11:31:09 -07002815 mutex_unlock(&mdsc->mutex);
2816 mutex_lock(&session->s_mutex);
2817 remove_session_caps(session);
2818 mutex_unlock(&session->s_mutex);
2819 ceph_put_mds_session(session);
2820 mutex_lock(&mdsc->mutex);
2821 }
2822 }
2823
2824 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2825
2826 mutex_unlock(&mdsc->mutex);
2827
2828 ceph_cleanup_empty_realms(mdsc);
2829
2830 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
2831
2832 dout("stopped\n");
2833}
2834
2835void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2836{
2837 dout("stop\n");
2838 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
2839 if (mdsc->mdsmap)
2840 ceph_mdsmap_destroy(mdsc->mdsmap);
2841 kfree(mdsc->sessions);
2842}
2843
2844
2845/*
2846 * handle mds map update.
2847 */
2848void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
2849{
2850 u32 epoch;
2851 u32 maplen;
2852 void *p = msg->front.iov_base;
2853 void *end = p + msg->front.iov_len;
2854 struct ceph_mdsmap *newmap, *oldmap;
2855 struct ceph_fsid fsid;
2856 int err = -EINVAL;
2857
2858 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
2859 ceph_decode_copy(&p, &fsid, sizeof(fsid));
Sage Weil07433042009-11-18 16:50:41 -08002860 if (ceph_check_fsid(mdsc->client, &fsid) < 0)
2861 return;
Sage Weilc89136e2009-10-14 09:59:09 -07002862 epoch = ceph_decode_32(&p);
2863 maplen = ceph_decode_32(&p);
Sage Weil2f2dc052009-10-06 11:31:09 -07002864 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
2865
2866 /* do we need it? */
2867 ceph_monc_got_mdsmap(&mdsc->client->monc, epoch);
2868 mutex_lock(&mdsc->mutex);
2869 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
2870 dout("handle_map epoch %u <= our %u\n",
2871 epoch, mdsc->mdsmap->m_epoch);
2872 mutex_unlock(&mdsc->mutex);
2873 return;
2874 }
2875
2876 newmap = ceph_mdsmap_decode(&p, end);
2877 if (IS_ERR(newmap)) {
2878 err = PTR_ERR(newmap);
2879 goto bad_unlock;
2880 }
2881
2882 /* swap into place */
2883 if (mdsc->mdsmap) {
2884 oldmap = mdsc->mdsmap;
2885 mdsc->mdsmap = newmap;
2886 check_new_map(mdsc, newmap, oldmap);
2887 ceph_mdsmap_destroy(oldmap);
2888 } else {
2889 mdsc->mdsmap = newmap; /* first mds map */
2890 }
2891 mdsc->client->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
2892
2893 __wake_requests(mdsc, &mdsc->waiting_for_map);
2894
2895 mutex_unlock(&mdsc->mutex);
2896 schedule_delayed(mdsc);
2897 return;
2898
2899bad_unlock:
2900 mutex_unlock(&mdsc->mutex);
2901bad:
2902 pr_err("error decoding mdsmap %d\n", err);
2903 return;
2904}
2905
2906static struct ceph_connection *con_get(struct ceph_connection *con)
2907{
2908 struct ceph_mds_session *s = con->private;
2909
2910 if (get_session(s)) {
Sage Weil2600d2d2010-02-22 15:12:16 -08002911 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
Sage Weil2f2dc052009-10-06 11:31:09 -07002912 return con;
2913 }
2914 dout("mdsc con_get %p FAIL\n", s);
2915 return NULL;
2916}
2917
2918static void con_put(struct ceph_connection *con)
2919{
2920 struct ceph_mds_session *s = con->private;
2921
Sage Weil2f2dc052009-10-06 11:31:09 -07002922 ceph_put_mds_session(s);
Sage Weil2600d2d2010-02-22 15:12:16 -08002923 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref));
Sage Weil2f2dc052009-10-06 11:31:09 -07002924}
2925
2926/*
2927 * if the client is unresponsive for long enough, the mds will kill
2928 * the session entirely.
2929 */
2930static void peer_reset(struct ceph_connection *con)
2931{
2932 struct ceph_mds_session *s = con->private;
2933
2934 pr_err("mds%d gave us the boot. IMPLEMENT RECONNECT.\n",
2935 s->s_mds);
2936}
2937
2938static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2939{
2940 struct ceph_mds_session *s = con->private;
2941 struct ceph_mds_client *mdsc = s->s_mdsc;
2942 int type = le16_to_cpu(msg->hdr.type);
2943
Sage Weil2600d2d2010-02-22 15:12:16 -08002944 mutex_lock(&mdsc->mutex);
2945 if (__verify_registered_session(mdsc, s) < 0) {
2946 mutex_unlock(&mdsc->mutex);
2947 goto out;
2948 }
2949 mutex_unlock(&mdsc->mutex);
2950
Sage Weil2f2dc052009-10-06 11:31:09 -07002951 switch (type) {
2952 case CEPH_MSG_MDS_MAP:
2953 ceph_mdsc_handle_map(mdsc, msg);
2954 break;
2955 case CEPH_MSG_CLIENT_SESSION:
2956 handle_session(s, msg);
2957 break;
2958 case CEPH_MSG_CLIENT_REPLY:
2959 handle_reply(s, msg);
2960 break;
2961 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
Sage Weil2600d2d2010-02-22 15:12:16 -08002962 handle_forward(mdsc, s, msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07002963 break;
2964 case CEPH_MSG_CLIENT_CAPS:
2965 ceph_handle_caps(s, msg);
2966 break;
2967 case CEPH_MSG_CLIENT_SNAP:
Sage Weil2600d2d2010-02-22 15:12:16 -08002968 ceph_handle_snap(mdsc, s, msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07002969 break;
2970 case CEPH_MSG_CLIENT_LEASE:
Sage Weil2600d2d2010-02-22 15:12:16 -08002971 handle_lease(mdsc, s, msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07002972 break;
2973
2974 default:
2975 pr_err("received unknown message type %d %s\n", type,
2976 ceph_msg_type_name(type));
2977 }
Sage Weil2600d2d2010-02-22 15:12:16 -08002978out:
Sage Weil2f2dc052009-10-06 11:31:09 -07002979 ceph_msg_put(msg);
2980}
2981
Sage Weil4e7a5dc2009-11-18 16:19:57 -08002982/*
2983 * authentication
2984 */
2985static int get_authorizer(struct ceph_connection *con,
2986 void **buf, int *len, int *proto,
2987 void **reply_buf, int *reply_len, int force_new)
2988{
2989 struct ceph_mds_session *s = con->private;
2990 struct ceph_mds_client *mdsc = s->s_mdsc;
2991 struct ceph_auth_client *ac = mdsc->client->monc.auth;
2992 int ret = 0;
2993
2994 if (force_new && s->s_authorizer) {
2995 ac->ops->destroy_authorizer(ac, s->s_authorizer);
2996 s->s_authorizer = NULL;
2997 }
2998 if (s->s_authorizer == NULL) {
2999 if (ac->ops->create_authorizer) {
3000 ret = ac->ops->create_authorizer(
3001 ac, CEPH_ENTITY_TYPE_MDS,
3002 &s->s_authorizer,
3003 &s->s_authorizer_buf,
3004 &s->s_authorizer_buf_len,
3005 &s->s_authorizer_reply_buf,
3006 &s->s_authorizer_reply_buf_len);
3007 if (ret)
3008 return ret;
3009 }
3010 }
3011
3012 *proto = ac->protocol;
3013 *buf = s->s_authorizer_buf;
3014 *len = s->s_authorizer_buf_len;
3015 *reply_buf = s->s_authorizer_reply_buf;
3016 *reply_len = s->s_authorizer_reply_buf_len;
3017 return 0;
3018}
3019
3020
3021static int verify_authorizer_reply(struct ceph_connection *con, int len)
3022{
3023 struct ceph_mds_session *s = con->private;
3024 struct ceph_mds_client *mdsc = s->s_mdsc;
3025 struct ceph_auth_client *ac = mdsc->client->monc.auth;
3026
3027 return ac->ops->verify_authorizer_reply(ac, s->s_authorizer, len);
3028}
3029
Sage Weil9bd2e6f2010-02-02 16:21:06 -08003030static int invalidate_authorizer(struct ceph_connection *con)
3031{
3032 struct ceph_mds_session *s = con->private;
3033 struct ceph_mds_client *mdsc = s->s_mdsc;
3034 struct ceph_auth_client *ac = mdsc->client->monc.auth;
3035
3036 if (ac->ops->invalidate_authorizer)
3037 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3038
3039 return ceph_monc_validate_auth(&mdsc->client->monc);
3040}
3041
Sage Weil2f2dc052009-10-06 11:31:09 -07003042const static struct ceph_connection_operations mds_con_ops = {
3043 .get = con_get,
3044 .put = con_put,
3045 .dispatch = dispatch,
Sage Weil4e7a5dc2009-11-18 16:19:57 -08003046 .get_authorizer = get_authorizer,
3047 .verify_authorizer_reply = verify_authorizer_reply,
Sage Weil9bd2e6f2010-02-02 16:21:06 -08003048 .invalidate_authorizer = invalidate_authorizer,
Sage Weil2f2dc052009-10-06 11:31:09 -07003049 .peer_reset = peer_reset,
Sage Weil2f2dc052009-10-06 11:31:09 -07003050};
3051
3052
3053
3054
3055/* eof */