1#include <linux/ceph/ceph_debug.h>
2
3#include <linux/module.h>
4#include <linux/types.h>
5#include <linux/slab.h>
6#include <linux/random.h>
7#include <linux/sched.h>
8
9#include <linux/ceph/mon_client.h>
10#include <linux/ceph/libceph.h>
11#include <linux/ceph/debugfs.h>
12#include <linux/ceph/decode.h>
13#include <linux/ceph/auth.h>
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33static const struct ceph_connection_operations mon_con_ops;
34
35static int __validate_auth(struct ceph_mon_client *monc);
36
37
38
39
40struct ceph_monmap *ceph_monmap_decode(void *p, void *end)
41{
42 struct ceph_monmap *m = NULL;
43 int i, err = -EINVAL;
44 struct ceph_fsid fsid;
45 u32 epoch, num_mon;
46 u16 version;
47 u32 len;
48
49 ceph_decode_32_safe(&p, end, len, bad);
50 ceph_decode_need(&p, end, len, bad);
51
52 dout("monmap_decode %p %p len %d\n", p, end, (int)(end-p));
53
54 ceph_decode_16_safe(&p, end, version, bad);
55
56 ceph_decode_need(&p, end, sizeof(fsid) + 2*sizeof(u32), bad);
57 ceph_decode_copy(&p, &fsid, sizeof(fsid));
58 epoch = ceph_decode_32(&p);
59
60 num_mon = ceph_decode_32(&p);
61 ceph_decode_need(&p, end, num_mon*sizeof(m->mon_inst[0]), bad);
62
63 if (num_mon >= CEPH_MAX_MON)
64 goto bad;
65 m = kmalloc(sizeof(*m) + sizeof(m->mon_inst[0])*num_mon, GFP_NOFS);
66 if (m == NULL)
67 return ERR_PTR(-ENOMEM);
68 m->fsid = fsid;
69 m->epoch = epoch;
70 m->num_mon = num_mon;
71 ceph_decode_copy(&p, m->mon_inst, num_mon*sizeof(m->mon_inst[0]));
72 for (i = 0; i < num_mon; i++)
73 ceph_decode_addr(&m->mon_inst[i].addr);
74
75 dout("monmap_decode epoch %d, num_mon %d\n", m->epoch,
76 m->num_mon);
77 for (i = 0; i < m->num_mon; i++)
78 dout("monmap_decode mon%d is %s\n", i,
79 ceph_pr_addr(&m->mon_inst[i].addr.in_addr));
80 return m;
81
82bad:
83 dout("monmap_decode failed with %d\n", err);
84 kfree(m);
85 return ERR_PTR(err);
86}
87
88
89
90
91int ceph_monmap_contains(struct ceph_monmap *m, struct ceph_entity_addr *addr)
92{
93 int i;
94
95 for (i = 0; i < m->num_mon; i++)
96 if (memcmp(addr, &m->mon_inst[i].addr, sizeof(*addr)) == 0)
97 return 1;
98 return 0;
99}
100
101
102
103
104static void __send_prepared_auth_request(struct ceph_mon_client *monc, int len)
105{
106 monc->pending_auth = 1;
107 monc->m_auth->front.iov_len = len;
108 monc->m_auth->hdr.front_len = cpu_to_le32(len);
109 ceph_msg_revoke(monc->m_auth);
110 ceph_msg_get(monc->m_auth);
111 ceph_con_send(&monc->con, monc->m_auth);
112}
113
114
115
116
117static void __close_session(struct ceph_mon_client *monc)
118{
119 dout("__close_session closing mon%d\n", monc->cur_mon);
120 ceph_msg_revoke(monc->m_auth);
121 ceph_msg_revoke_incoming(monc->m_auth_reply);
122 ceph_msg_revoke(monc->m_subscribe);
123 ceph_msg_revoke_incoming(monc->m_subscribe_ack);
124 ceph_con_close(&monc->con);
125
126 monc->pending_auth = 0;
127 ceph_auth_reset(monc->auth);
128}
129
130
131
132
133
134static void pick_new_mon(struct ceph_mon_client *monc)
135{
136 int old_mon = monc->cur_mon;
137
138 BUG_ON(monc->monmap->num_mon < 1);
139
140 if (monc->monmap->num_mon == 1) {
141 monc->cur_mon = 0;
142 } else {
143 int max = monc->monmap->num_mon;
144 int o = -1;
145 int n;
146
147 if (monc->cur_mon >= 0) {
148 if (monc->cur_mon < monc->monmap->num_mon)
149 o = monc->cur_mon;
150 if (o >= 0)
151 max--;
152 }
153
154 n = prandom_u32() % max;
155 if (o >= 0 && n >= o)
156 n++;
157
158 monc->cur_mon = n;
159 }
160
161 dout("%s mon%d -> mon%d out of %d mons\n", __func__, old_mon,
162 monc->cur_mon, monc->monmap->num_mon);
163}
164
165
166
167
168static void __open_session(struct ceph_mon_client *monc)
169{
170 int ret;
171
172 pick_new_mon(monc);
173
174 monc->hunting = true;
175 if (monc->had_a_connection) {
176 monc->hunt_mult *= CEPH_MONC_HUNT_BACKOFF;
177 if (monc->hunt_mult > CEPH_MONC_HUNT_MAX_MULT)
178 monc->hunt_mult = CEPH_MONC_HUNT_MAX_MULT;
179 }
180
181 monc->sub_renew_after = jiffies;
182 monc->sub_renew_sent = 0;
183
184 dout("%s opening mon%d\n", __func__, monc->cur_mon);
185 ceph_con_open(&monc->con, CEPH_ENTITY_TYPE_MON, monc->cur_mon,
186 &monc->monmap->mon_inst[monc->cur_mon].addr);
187
188
189
190
191
192 ceph_con_keepalive(&monc->con);
193
194
195 ret = ceph_auth_build_hello(monc->auth,
196 monc->m_auth->front.iov_base,
197 monc->m_auth->front_alloc_len);
198 BUG_ON(ret <= 0);
199 __send_prepared_auth_request(monc, ret);
200}
201
202static void reopen_session(struct ceph_mon_client *monc)
203{
204 if (!monc->hunting)
205 pr_info("mon%d %s session lost, hunting for new mon\n",
206 monc->cur_mon, ceph_pr_addr(&monc->con.peer_addr.in_addr));
207
208 __close_session(monc);
209 __open_session(monc);
210}
211
212
213
214
215static void __schedule_delayed(struct ceph_mon_client *monc)
216{
217 unsigned long delay;
218
219 if (monc->hunting)
220 delay = CEPH_MONC_HUNT_INTERVAL * monc->hunt_mult;
221 else
222 delay = CEPH_MONC_PING_INTERVAL;
223
224 dout("__schedule_delayed after %lu\n", delay);
225 mod_delayed_work(system_wq, &monc->delayed_work,
226 round_jiffies_relative(delay));
227}
228
229const char *ceph_sub_str[] = {
230 [CEPH_SUB_MONMAP] = "monmap",
231 [CEPH_SUB_OSDMAP] = "osdmap",
232 [CEPH_SUB_FSMAP] = "fsmap.user",
233 [CEPH_SUB_MDSMAP] = "mdsmap",
234};
235
236
237
238
239
240static void __send_subscribe(struct ceph_mon_client *monc)
241{
242 struct ceph_msg *msg = monc->m_subscribe;
243 void *p = msg->front.iov_base;
244 void *const end = p + msg->front_alloc_len;
245 int num = 0;
246 int i;
247
248 dout("%s sent %lu\n", __func__, monc->sub_renew_sent);
249
250 BUG_ON(monc->cur_mon < 0);
251
252 if (!monc->sub_renew_sent)
253 monc->sub_renew_sent = jiffies | 1;
254
255 msg->hdr.version = cpu_to_le16(2);
256
257 for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
258 if (monc->subs[i].want)
259 num++;
260 }
261 BUG_ON(num < 1);
262 ceph_encode_32(&p, num);
263 for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
264 char buf[32];
265 int len;
266
267 if (!monc->subs[i].want)
268 continue;
269
270 len = sprintf(buf, "%s", ceph_sub_str[i]);
271 if (i == CEPH_SUB_MDSMAP &&
272 monc->fs_cluster_id != CEPH_FS_CLUSTER_ID_NONE)
273 len += sprintf(buf + len, ".%d", monc->fs_cluster_id);
274
275 dout("%s %s start %llu flags 0x%x\n", __func__, buf,
276 le64_to_cpu(monc->subs[i].item.start),
277 monc->subs[i].item.flags);
278 ceph_encode_string(&p, end, buf, len);
279 memcpy(p, &monc->subs[i].item, sizeof(monc->subs[i].item));
280 p += sizeof(monc->subs[i].item);
281 }
282
283 BUG_ON(p > end);
284 msg->front.iov_len = p - msg->front.iov_base;
285 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
286 ceph_msg_revoke(msg);
287 ceph_con_send(&monc->con, ceph_msg_get(msg));
288}
289
290static void handle_subscribe_ack(struct ceph_mon_client *monc,
291 struct ceph_msg *msg)
292{
293 unsigned int seconds;
294 struct ceph_mon_subscribe_ack *h = msg->front.iov_base;
295
296 if (msg->front.iov_len < sizeof(*h))
297 goto bad;
298 seconds = le32_to_cpu(h->duration);
299
300 mutex_lock(&monc->mutex);
301 if (monc->sub_renew_sent) {
302 monc->sub_renew_after = monc->sub_renew_sent +
303 (seconds >> 1) * HZ - 1;
304 dout("%s sent %lu duration %d renew after %lu\n", __func__,
305 monc->sub_renew_sent, seconds, monc->sub_renew_after);
306 monc->sub_renew_sent = 0;
307 } else {
308 dout("%s sent %lu renew after %lu, ignoring\n", __func__,
309 monc->sub_renew_sent, monc->sub_renew_after);
310 }
311 mutex_unlock(&monc->mutex);
312 return;
313bad:
314 pr_err("got corrupt subscribe-ack msg\n");
315 ceph_msg_dump(msg);
316}
317
318
319
320
321
322
323
324static bool __ceph_monc_want_map(struct ceph_mon_client *monc, int sub,
325 u32 epoch, bool continuous)
326{
327 __le64 start = cpu_to_le64(epoch);
328 u8 flags = !continuous ? CEPH_SUBSCRIBE_ONETIME : 0;
329
330 dout("%s %s epoch %u continuous %d\n", __func__, ceph_sub_str[sub],
331 epoch, continuous);
332
333 if (monc->subs[sub].want &&
334 monc->subs[sub].item.start == start &&
335 monc->subs[sub].item.flags == flags)
336 return false;
337
338 monc->subs[sub].item.start = start;
339 monc->subs[sub].item.flags = flags;
340 monc->subs[sub].want = true;
341
342 return true;
343}
344
345bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
346 bool continuous)
347{
348 bool need_request;
349
350 mutex_lock(&monc->mutex);
351 need_request = __ceph_monc_want_map(monc, sub, epoch, continuous);
352 mutex_unlock(&monc->mutex);
353
354 return need_request;
355}
356EXPORT_SYMBOL(ceph_monc_want_map);
357
358
359
360
361
362
363static void __ceph_monc_got_map(struct ceph_mon_client *monc, int sub,
364 u32 epoch)
365{
366 dout("%s %s epoch %u\n", __func__, ceph_sub_str[sub], epoch);
367
368 if (monc->subs[sub].want) {
369 if (monc->subs[sub].item.flags & CEPH_SUBSCRIBE_ONETIME)
370 monc->subs[sub].want = false;
371 else
372 monc->subs[sub].item.start = cpu_to_le64(epoch + 1);
373 }
374
375 monc->subs[sub].have = epoch;
376}
377
378void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch)
379{
380 mutex_lock(&monc->mutex);
381 __ceph_monc_got_map(monc, sub, epoch);
382 mutex_unlock(&monc->mutex);
383}
384EXPORT_SYMBOL(ceph_monc_got_map);
385
386void ceph_monc_renew_subs(struct ceph_mon_client *monc)
387{
388 mutex_lock(&monc->mutex);
389 __send_subscribe(monc);
390 mutex_unlock(&monc->mutex);
391}
392EXPORT_SYMBOL(ceph_monc_renew_subs);
393
394
395
396
397
398
399
400int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
401 unsigned long timeout)
402{
403 unsigned long started = jiffies;
404 long ret;
405
406 mutex_lock(&monc->mutex);
407 while (monc->subs[CEPH_SUB_OSDMAP].have < epoch) {
408 mutex_unlock(&monc->mutex);
409
410 if (timeout && time_after_eq(jiffies, started + timeout))
411 return -ETIMEDOUT;
412
413 ret = wait_event_interruptible_timeout(monc->client->auth_wq,
414 monc->subs[CEPH_SUB_OSDMAP].have >= epoch,
415 ceph_timeout_jiffies(timeout));
416 if (ret < 0)
417 return ret;
418
419 mutex_lock(&monc->mutex);
420 }
421
422 mutex_unlock(&monc->mutex);
423 return 0;
424}
425EXPORT_SYMBOL(ceph_monc_wait_osdmap);
426
427
428
429
430
431int ceph_monc_open_session(struct ceph_mon_client *monc)
432{
433 mutex_lock(&monc->mutex);
434 __ceph_monc_want_map(monc, CEPH_SUB_MONMAP, 0, true);
435 __ceph_monc_want_map(monc, CEPH_SUB_OSDMAP, 0, false);
436 __open_session(monc);
437 __schedule_delayed(monc);
438 mutex_unlock(&monc->mutex);
439 return 0;
440}
441EXPORT_SYMBOL(ceph_monc_open_session);
442
443static void ceph_monc_handle_map(struct ceph_mon_client *monc,
444 struct ceph_msg *msg)
445{
446 struct ceph_client *client = monc->client;
447 struct ceph_monmap *monmap = NULL, *old = monc->monmap;
448 void *p, *end;
449
450 mutex_lock(&monc->mutex);
451
452 dout("handle_monmap\n");
453 p = msg->front.iov_base;
454 end = p + msg->front.iov_len;
455
456 monmap = ceph_monmap_decode(p, end);
457 if (IS_ERR(monmap)) {
458 pr_err("problem decoding monmap, %d\n",
459 (int)PTR_ERR(monmap));
460 goto out;
461 }
462
463 if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) {
464 kfree(monmap);
465 goto out;
466 }
467
468 client->monc.monmap = monmap;
469 kfree(old);
470
471 __ceph_monc_got_map(monc, CEPH_SUB_MONMAP, monc->monmap->epoch);
472 client->have_fsid = true;
473
474out:
475 mutex_unlock(&monc->mutex);
476 wake_up_all(&client->auth_wq);
477}
478
479
480
481
482DEFINE_RB_FUNCS(generic_request, struct ceph_mon_generic_request, tid, node)
483
484static void release_generic_request(struct kref *kref)
485{
486 struct ceph_mon_generic_request *req =
487 container_of(kref, struct ceph_mon_generic_request, kref);
488
489 dout("%s greq %p request %p reply %p\n", __func__, req, req->request,
490 req->reply);
491 WARN_ON(!RB_EMPTY_NODE(&req->node));
492
493 if (req->reply)
494 ceph_msg_put(req->reply);
495 if (req->request)
496 ceph_msg_put(req->request);
497
498 kfree(req);
499}
500
501static void put_generic_request(struct ceph_mon_generic_request *req)
502{
503 if (req)
504 kref_put(&req->kref, release_generic_request);
505}
506
507static void get_generic_request(struct ceph_mon_generic_request *req)
508{
509 kref_get(&req->kref);
510}
511
512static struct ceph_mon_generic_request *
513alloc_generic_request(struct ceph_mon_client *monc, gfp_t gfp)
514{
515 struct ceph_mon_generic_request *req;
516
517 req = kzalloc(sizeof(*req), gfp);
518 if (!req)
519 return NULL;
520
521 req->monc = monc;
522 kref_init(&req->kref);
523 RB_CLEAR_NODE(&req->node);
524 init_completion(&req->completion);
525
526 dout("%s greq %p\n", __func__, req);
527 return req;
528}
529
530static void register_generic_request(struct ceph_mon_generic_request *req)
531{
532 struct ceph_mon_client *monc = req->monc;
533
534 WARN_ON(req->tid);
535
536 get_generic_request(req);
537 req->tid = ++monc->last_tid;
538 insert_generic_request(&monc->generic_request_tree, req);
539}
540
541static void send_generic_request(struct ceph_mon_client *monc,
542 struct ceph_mon_generic_request *req)
543{
544 WARN_ON(!req->tid);
545
546 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
547 req->request->hdr.tid = cpu_to_le64(req->tid);
548 ceph_con_send(&monc->con, ceph_msg_get(req->request));
549}
550
551static void __finish_generic_request(struct ceph_mon_generic_request *req)
552{
553 struct ceph_mon_client *monc = req->monc;
554
555 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
556 erase_generic_request(&monc->generic_request_tree, req);
557
558 ceph_msg_revoke(req->request);
559 ceph_msg_revoke_incoming(req->reply);
560}
561
562static void finish_generic_request(struct ceph_mon_generic_request *req)
563{
564 __finish_generic_request(req);
565 put_generic_request(req);
566}
567
568static void complete_generic_request(struct ceph_mon_generic_request *req)
569{
570 if (req->complete_cb)
571 req->complete_cb(req);
572 else
573 complete_all(&req->completion);
574 put_generic_request(req);
575}
576
577static void cancel_generic_request(struct ceph_mon_generic_request *req)
578{
579 struct ceph_mon_client *monc = req->monc;
580 struct ceph_mon_generic_request *lookup_req;
581
582 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
583
584 mutex_lock(&monc->mutex);
585 lookup_req = lookup_generic_request(&monc->generic_request_tree,
586 req->tid);
587 if (lookup_req) {
588 WARN_ON(lookup_req != req);
589 finish_generic_request(req);
590 }
591
592 mutex_unlock(&monc->mutex);
593}
594
595static int wait_generic_request(struct ceph_mon_generic_request *req)
596{
597 int ret;
598
599 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
600 ret = wait_for_completion_interruptible(&req->completion);
601 if (ret)
602 cancel_generic_request(req);
603 else
604 ret = req->result;
605
606 return ret;
607}
608
609static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
610 struct ceph_msg_header *hdr,
611 int *skip)
612{
613 struct ceph_mon_client *monc = con->private;
614 struct ceph_mon_generic_request *req;
615 u64 tid = le64_to_cpu(hdr->tid);
616 struct ceph_msg *m;
617
618 mutex_lock(&monc->mutex);
619 req = lookup_generic_request(&monc->generic_request_tree, tid);
620 if (!req) {
621 dout("get_generic_reply %lld dne\n", tid);
622 *skip = 1;
623 m = NULL;
624 } else {
625 dout("get_generic_reply %lld got %p\n", tid, req->reply);
626 *skip = 0;
627 m = ceph_msg_get(req->reply);
628
629
630
631
632
633 }
634 mutex_unlock(&monc->mutex);
635 return m;
636}
637
638
639
640
641static void handle_statfs_reply(struct ceph_mon_client *monc,
642 struct ceph_msg *msg)
643{
644 struct ceph_mon_generic_request *req;
645 struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
646 u64 tid = le64_to_cpu(msg->hdr.tid);
647
648 dout("%s msg %p tid %llu\n", __func__, msg, tid);
649
650 if (msg->front.iov_len != sizeof(*reply))
651 goto bad;
652
653 mutex_lock(&monc->mutex);
654 req = lookup_generic_request(&monc->generic_request_tree, tid);
655 if (!req) {
656 mutex_unlock(&monc->mutex);
657 return;
658 }
659
660 req->result = 0;
661 *req->u.st = reply->st;
662 __finish_generic_request(req);
663 mutex_unlock(&monc->mutex);
664
665 complete_generic_request(req);
666 return;
667
668bad:
669 pr_err("corrupt statfs reply, tid %llu\n", tid);
670 ceph_msg_dump(msg);
671}
672
673
674
675
676int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf)
677{
678 struct ceph_mon_generic_request *req;
679 struct ceph_mon_statfs *h;
680 int ret = -ENOMEM;
681
682 req = alloc_generic_request(monc, GFP_NOFS);
683 if (!req)
684 goto out;
685
686 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS,
687 true);
688 if (!req->request)
689 goto out;
690
691 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 64, GFP_NOFS, true);
692 if (!req->reply)
693 goto out;
694
695 req->u.st = buf;
696
697 mutex_lock(&monc->mutex);
698 register_generic_request(req);
699
700 h = req->request->front.iov_base;
701 h->monhdr.have_version = 0;
702 h->monhdr.session_mon = cpu_to_le16(-1);
703 h->monhdr.session_mon_tid = 0;
704 h->fsid = monc->monmap->fsid;
705 send_generic_request(monc, req);
706 mutex_unlock(&monc->mutex);
707
708 ret = wait_generic_request(req);
709out:
710 put_generic_request(req);
711 return ret;
712}
713EXPORT_SYMBOL(ceph_monc_do_statfs);
714
715static void handle_get_version_reply(struct ceph_mon_client *monc,
716 struct ceph_msg *msg)
717{
718 struct ceph_mon_generic_request *req;
719 u64 tid = le64_to_cpu(msg->hdr.tid);
720 void *p = msg->front.iov_base;
721 void *end = p + msg->front_alloc_len;
722 u64 handle;
723
724 dout("%s msg %p tid %llu\n", __func__, msg, tid);
725
726 ceph_decode_need(&p, end, 2*sizeof(u64), bad);
727 handle = ceph_decode_64(&p);
728 if (tid != 0 && tid != handle)
729 goto bad;
730
731 mutex_lock(&monc->mutex);
732 req = lookup_generic_request(&monc->generic_request_tree, handle);
733 if (!req) {
734 mutex_unlock(&monc->mutex);
735 return;
736 }
737
738 req->result = 0;
739 req->u.newest = ceph_decode_64(&p);
740 __finish_generic_request(req);
741 mutex_unlock(&monc->mutex);
742
743 complete_generic_request(req);
744 return;
745
746bad:
747 pr_err("corrupt mon_get_version reply, tid %llu\n", tid);
748 ceph_msg_dump(msg);
749}
750
751static struct ceph_mon_generic_request *
752__ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
753 ceph_monc_callback_t cb, u64 private_data)
754{
755 struct ceph_mon_generic_request *req;
756
757 req = alloc_generic_request(monc, GFP_NOIO);
758 if (!req)
759 goto err_put_req;
760
761 req->request = ceph_msg_new(CEPH_MSG_MON_GET_VERSION,
762 sizeof(u64) + sizeof(u32) + strlen(what),
763 GFP_NOIO, true);
764 if (!req->request)
765 goto err_put_req;
766
767 req->reply = ceph_msg_new(CEPH_MSG_MON_GET_VERSION_REPLY, 32, GFP_NOIO,
768 true);
769 if (!req->reply)
770 goto err_put_req;
771
772 req->complete_cb = cb;
773 req->private_data = private_data;
774
775 mutex_lock(&monc->mutex);
776 register_generic_request(req);
777 {
778 void *p = req->request->front.iov_base;
779 void *const end = p + req->request->front_alloc_len;
780
781 ceph_encode_64(&p, req->tid);
782 ceph_encode_string(&p, end, what, strlen(what));
783 WARN_ON(p != end);
784 }
785 send_generic_request(monc, req);
786 mutex_unlock(&monc->mutex);
787
788 return req;
789
790err_put_req:
791 put_generic_request(req);
792 return ERR_PTR(-ENOMEM);
793}
794
795
796
797
798
799
800int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
801 u64 *newest)
802{
803 struct ceph_mon_generic_request *req;
804 int ret;
805
806 req = __ceph_monc_get_version(monc, what, NULL, 0);
807 if (IS_ERR(req))
808 return PTR_ERR(req);
809
810 ret = wait_generic_request(req);
811 if (!ret)
812 *newest = req->u.newest;
813
814 put_generic_request(req);
815 return ret;
816}
817EXPORT_SYMBOL(ceph_monc_get_version);
818
819
820
821
822
823
824int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
825 ceph_monc_callback_t cb, u64 private_data)
826{
827 struct ceph_mon_generic_request *req;
828
829 req = __ceph_monc_get_version(monc, what, cb, private_data);
830 if (IS_ERR(req))
831 return PTR_ERR(req);
832
833 put_generic_request(req);
834 return 0;
835}
836EXPORT_SYMBOL(ceph_monc_get_version_async);
837
838static void handle_command_ack(struct ceph_mon_client *monc,
839 struct ceph_msg *msg)
840{
841 struct ceph_mon_generic_request *req;
842 void *p = msg->front.iov_base;
843 void *const end = p + msg->front_alloc_len;
844 u64 tid = le64_to_cpu(msg->hdr.tid);
845
846 dout("%s msg %p tid %llu\n", __func__, msg, tid);
847
848 ceph_decode_need(&p, end, sizeof(struct ceph_mon_request_header) +
849 sizeof(u32), bad);
850 p += sizeof(struct ceph_mon_request_header);
851
852 mutex_lock(&monc->mutex);
853 req = lookup_generic_request(&monc->generic_request_tree, tid);
854 if (!req) {
855 mutex_unlock(&monc->mutex);
856 return;
857 }
858
859 req->result = ceph_decode_32(&p);
860 __finish_generic_request(req);
861 mutex_unlock(&monc->mutex);
862
863 complete_generic_request(req);
864 return;
865
866bad:
867 pr_err("corrupt mon_command ack, tid %llu\n", tid);
868 ceph_msg_dump(msg);
869}
870
871int ceph_monc_blacklist_add(struct ceph_mon_client *monc,
872 struct ceph_entity_addr *client_addr)
873{
874 struct ceph_mon_generic_request *req;
875 struct ceph_mon_command *h;
876 int ret = -ENOMEM;
877 int len;
878
879 req = alloc_generic_request(monc, GFP_NOIO);
880 if (!req)
881 goto out;
882
883 req->request = ceph_msg_new(CEPH_MSG_MON_COMMAND, 256, GFP_NOIO, true);
884 if (!req->request)
885 goto out;
886
887 req->reply = ceph_msg_new(CEPH_MSG_MON_COMMAND_ACK, 512, GFP_NOIO,
888 true);
889 if (!req->reply)
890 goto out;
891
892 mutex_lock(&monc->mutex);
893 register_generic_request(req);
894 h = req->request->front.iov_base;
895 h->monhdr.have_version = 0;
896 h->monhdr.session_mon = cpu_to_le16(-1);
897 h->monhdr.session_mon_tid = 0;
898 h->fsid = monc->monmap->fsid;
899 h->num_strs = cpu_to_le32(1);
900 len = sprintf(h->str, "{ \"prefix\": \"osd blacklist\", \
901 \"blacklistop\": \"add\", \
902 \"addr\": \"%pISpc/%u\" }",
903 &client_addr->in_addr, le32_to_cpu(client_addr->nonce));
904 h->str_len = cpu_to_le32(len);
905 send_generic_request(monc, req);
906 mutex_unlock(&monc->mutex);
907
908 ret = wait_generic_request(req);
909out:
910 put_generic_request(req);
911 return ret;
912}
913EXPORT_SYMBOL(ceph_monc_blacklist_add);
914
915
916
917
918static void __resend_generic_request(struct ceph_mon_client *monc)
919{
920 struct ceph_mon_generic_request *req;
921 struct rb_node *p;
922
923 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
924 req = rb_entry(p, struct ceph_mon_generic_request, node);
925 ceph_msg_revoke(req->request);
926 ceph_msg_revoke_incoming(req->reply);
927 ceph_con_send(&monc->con, ceph_msg_get(req->request));
928 }
929}
930
931
932
933
934
935
936static void delayed_work(struct work_struct *work)
937{
938 struct ceph_mon_client *monc =
939 container_of(work, struct ceph_mon_client, delayed_work.work);
940
941 dout("monc delayed_work\n");
942 mutex_lock(&monc->mutex);
943 if (monc->hunting) {
944 dout("%s continuing hunt\n", __func__);
945 reopen_session(monc);
946 } else {
947 int is_auth = ceph_auth_is_authenticated(monc->auth);
948 if (ceph_con_keepalive_expired(&monc->con,
949 CEPH_MONC_PING_TIMEOUT)) {
950 dout("monc keepalive timeout\n");
951 is_auth = 0;
952 reopen_session(monc);
953 }
954
955 if (!monc->hunting) {
956 ceph_con_keepalive(&monc->con);
957 __validate_auth(monc);
958 }
959
960 if (is_auth) {
961 unsigned long now = jiffies;
962
963 dout("%s renew subs? now %lu renew after %lu\n",
964 __func__, now, monc->sub_renew_after);
965 if (time_after_eq(now, monc->sub_renew_after))
966 __send_subscribe(monc);
967 }
968 }
969 __schedule_delayed(monc);
970 mutex_unlock(&monc->mutex);
971}
972
973
974
975
976
977static int build_initial_monmap(struct ceph_mon_client *monc)
978{
979 struct ceph_options *opt = monc->client->options;
980 struct ceph_entity_addr *mon_addr = opt->mon_addr;
981 int num_mon = opt->num_mon;
982 int i;
983
984
985 monc->monmap = kzalloc(sizeof(*monc->monmap) +
986 num_mon*sizeof(monc->monmap->mon_inst[0]),
987 GFP_KERNEL);
988 if (!monc->monmap)
989 return -ENOMEM;
990 for (i = 0; i < num_mon; i++) {
991 monc->monmap->mon_inst[i].addr = mon_addr[i];
992 monc->monmap->mon_inst[i].addr.nonce = 0;
993 monc->monmap->mon_inst[i].name.type =
994 CEPH_ENTITY_TYPE_MON;
995 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
996 }
997 monc->monmap->num_mon = num_mon;
998 return 0;
999}
1000
1001int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
1002{
1003 int err = 0;
1004
1005 dout("init\n");
1006 memset(monc, 0, sizeof(*monc));
1007 monc->client = cl;
1008 monc->monmap = NULL;
1009 mutex_init(&monc->mutex);
1010
1011 err = build_initial_monmap(monc);
1012 if (err)
1013 goto out;
1014
1015
1016
1017 monc->auth = ceph_auth_init(cl->options->name,
1018 cl->options->key);
1019 if (IS_ERR(monc->auth)) {
1020 err = PTR_ERR(monc->auth);
1021 goto out_monmap;
1022 }
1023 monc->auth->want_keys =
1024 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
1025 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
1026
1027
1028 err = -ENOMEM;
1029 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
1030 sizeof(struct ceph_mon_subscribe_ack),
1031 GFP_NOFS, true);
1032 if (!monc->m_subscribe_ack)
1033 goto out_auth;
1034
1035 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 128, GFP_NOFS,
1036 true);
1037 if (!monc->m_subscribe)
1038 goto out_subscribe_ack;
1039
1040 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS,
1041 true);
1042 if (!monc->m_auth_reply)
1043 goto out_subscribe;
1044
1045 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS, true);
1046 monc->pending_auth = 0;
1047 if (!monc->m_auth)
1048 goto out_auth_reply;
1049
1050 ceph_con_init(&monc->con, monc, &mon_con_ops,
1051 &monc->client->msgr);
1052
1053 monc->cur_mon = -1;
1054 monc->had_a_connection = false;
1055 monc->hunt_mult = 1;
1056
1057 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
1058 monc->generic_request_tree = RB_ROOT;
1059 monc->last_tid = 0;
1060
1061 monc->fs_cluster_id = CEPH_FS_CLUSTER_ID_NONE;
1062
1063 return 0;
1064
1065out_auth_reply:
1066 ceph_msg_put(monc->m_auth_reply);
1067out_subscribe:
1068 ceph_msg_put(monc->m_subscribe);
1069out_subscribe_ack:
1070 ceph_msg_put(monc->m_subscribe_ack);
1071out_auth:
1072 ceph_auth_destroy(monc->auth);
1073out_monmap:
1074 kfree(monc->monmap);
1075out:
1076 return err;
1077}
1078EXPORT_SYMBOL(ceph_monc_init);
1079
1080void ceph_monc_stop(struct ceph_mon_client *monc)
1081{
1082 dout("stop\n");
1083 cancel_delayed_work_sync(&monc->delayed_work);
1084
1085 mutex_lock(&monc->mutex);
1086 __close_session(monc);
1087 monc->cur_mon = -1;
1088 mutex_unlock(&monc->mutex);
1089
1090
1091
1092
1093
1094
1095
1096 ceph_msgr_flush();
1097
1098 ceph_auth_destroy(monc->auth);
1099
1100 WARN_ON(!RB_EMPTY_ROOT(&monc->generic_request_tree));
1101
1102 ceph_msg_put(monc->m_auth);
1103 ceph_msg_put(monc->m_auth_reply);
1104 ceph_msg_put(monc->m_subscribe);
1105 ceph_msg_put(monc->m_subscribe_ack);
1106
1107 kfree(monc->monmap);
1108}
1109EXPORT_SYMBOL(ceph_monc_stop);
1110
1111static void finish_hunting(struct ceph_mon_client *monc)
1112{
1113 if (monc->hunting) {
1114 dout("%s found mon%d\n", __func__, monc->cur_mon);
1115 monc->hunting = false;
1116 monc->had_a_connection = true;
1117 monc->hunt_mult /= 2;
1118 if (monc->hunt_mult < 1)
1119 monc->hunt_mult = 1;
1120 }
1121}
1122
1123static void handle_auth_reply(struct ceph_mon_client *monc,
1124 struct ceph_msg *msg)
1125{
1126 int ret;
1127 int was_auth = 0;
1128
1129 mutex_lock(&monc->mutex);
1130 was_auth = ceph_auth_is_authenticated(monc->auth);
1131 monc->pending_auth = 0;
1132 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
1133 msg->front.iov_len,
1134 monc->m_auth->front.iov_base,
1135 monc->m_auth->front_alloc_len);
1136 if (ret > 0) {
1137 __send_prepared_auth_request(monc, ret);
1138 goto out;
1139 }
1140
1141 finish_hunting(monc);
1142
1143 if (ret < 0) {
1144 monc->client->auth_err = ret;
1145 } else if (!was_auth && ceph_auth_is_authenticated(monc->auth)) {
1146 dout("authenticated, starting session\n");
1147
1148 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
1149 monc->client->msgr.inst.name.num =
1150 cpu_to_le64(monc->auth->global_id);
1151
1152 __send_subscribe(monc);
1153 __resend_generic_request(monc);
1154
1155 pr_info("mon%d %s session established\n", monc->cur_mon,
1156 ceph_pr_addr(&monc->con.peer_addr.in_addr));
1157 }
1158
1159out:
1160 mutex_unlock(&monc->mutex);
1161 if (monc->client->auth_err < 0)
1162 wake_up_all(&monc->client->auth_wq);
1163}
1164
1165static int __validate_auth(struct ceph_mon_client *monc)
1166{
1167 int ret;
1168
1169 if (monc->pending_auth)
1170 return 0;
1171
1172 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
1173 monc->m_auth->front_alloc_len);
1174 if (ret <= 0)
1175 return ret;
1176 __send_prepared_auth_request(monc, ret);
1177 return 0;
1178}
1179
1180int ceph_monc_validate_auth(struct ceph_mon_client *monc)
1181{
1182 int ret;
1183
1184 mutex_lock(&monc->mutex);
1185 ret = __validate_auth(monc);
1186 mutex_unlock(&monc->mutex);
1187 return ret;
1188}
1189EXPORT_SYMBOL(ceph_monc_validate_auth);
1190
1191
1192
1193
1194static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1195{
1196 struct ceph_mon_client *monc = con->private;
1197 int type = le16_to_cpu(msg->hdr.type);
1198
1199 if (!monc)
1200 return;
1201
1202 switch (type) {
1203 case CEPH_MSG_AUTH_REPLY:
1204 handle_auth_reply(monc, msg);
1205 break;
1206
1207 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1208 handle_subscribe_ack(monc, msg);
1209 break;
1210
1211 case CEPH_MSG_STATFS_REPLY:
1212 handle_statfs_reply(monc, msg);
1213 break;
1214
1215 case CEPH_MSG_MON_GET_VERSION_REPLY:
1216 handle_get_version_reply(monc, msg);
1217 break;
1218
1219 case CEPH_MSG_MON_COMMAND_ACK:
1220 handle_command_ack(monc, msg);
1221 break;
1222
1223 case CEPH_MSG_MON_MAP:
1224 ceph_monc_handle_map(monc, msg);
1225 break;
1226
1227 case CEPH_MSG_OSD_MAP:
1228 ceph_osdc_handle_map(&monc->client->osdc, msg);
1229 break;
1230
1231 default:
1232
1233 if (monc->client->extra_mon_dispatch &&
1234 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1235 break;
1236
1237 pr_err("received unknown message type %d %s\n", type,
1238 ceph_msg_type_name(type));
1239 }
1240 ceph_msg_put(msg);
1241}
1242
1243
1244
1245
1246static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1247 struct ceph_msg_header *hdr,
1248 int *skip)
1249{
1250 struct ceph_mon_client *monc = con->private;
1251 int type = le16_to_cpu(hdr->type);
1252 int front_len = le32_to_cpu(hdr->front_len);
1253 struct ceph_msg *m = NULL;
1254
1255 *skip = 0;
1256
1257 switch (type) {
1258 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1259 m = ceph_msg_get(monc->m_subscribe_ack);
1260 break;
1261 case CEPH_MSG_STATFS_REPLY:
1262 case CEPH_MSG_MON_COMMAND_ACK:
1263 return get_generic_reply(con, hdr, skip);
1264 case CEPH_MSG_AUTH_REPLY:
1265 m = ceph_msg_get(monc->m_auth_reply);
1266 break;
1267 case CEPH_MSG_MON_GET_VERSION_REPLY:
1268 if (le64_to_cpu(hdr->tid) != 0)
1269 return get_generic_reply(con, hdr, skip);
1270
1271
1272
1273
1274
1275
1276 case CEPH_MSG_MON_MAP:
1277 case CEPH_MSG_MDS_MAP:
1278 case CEPH_MSG_OSD_MAP:
1279 case CEPH_MSG_FS_MAP_USER:
1280 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1281 if (!m)
1282 return NULL;
1283 break;
1284 }
1285
1286 if (!m) {
1287 pr_info("alloc_msg unknown type %d\n", type);
1288 *skip = 1;
1289 } else if (front_len > m->front_alloc_len) {
1290 pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
1291 front_len, m->front_alloc_len,
1292 (unsigned int)con->peer_name.type,
1293 le64_to_cpu(con->peer_name.num));
1294 ceph_msg_put(m);
1295 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1296 }
1297
1298 return m;
1299}
1300
1301
1302
1303
1304
1305static void mon_fault(struct ceph_connection *con)
1306{
1307 struct ceph_mon_client *monc = con->private;
1308
1309 mutex_lock(&monc->mutex);
1310 dout("%s mon%d\n", __func__, monc->cur_mon);
1311 if (monc->cur_mon >= 0) {
1312 if (!monc->hunting) {
1313 dout("%s hunting for new mon\n", __func__);
1314 reopen_session(monc);
1315 __schedule_delayed(monc);
1316 } else {
1317 dout("%s already hunting\n", __func__);
1318 }
1319 }
1320 mutex_unlock(&monc->mutex);
1321}
1322
1323
1324
1325
1326
1327
1328static struct ceph_connection *con_get(struct ceph_connection *con)
1329{
1330 return con;
1331}
1332
1333static void con_put(struct ceph_connection *con)
1334{
1335}
1336
1337static const struct ceph_connection_operations mon_con_ops = {
1338 .get = con_get,
1339 .put = con_put,
1340 .dispatch = dispatch,
1341 .fault = mon_fault,
1342 .alloc_msg = mon_alloc_msg,
1343};
1344