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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
[linux/fpc-iii.git] / net / ceph / mon_client.c
blob875675765531361fffa503707a9a98e4596664dd
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/ceph_features.h>
10 #include <linux/ceph/mon_client.h>
11 #include <linux/ceph/libceph.h>
12 #include <linux/ceph/debugfs.h>
13 #include <linux/ceph/decode.h>
14 #include <linux/ceph/auth.h>
15
16 /*
17 * Interact with Ceph monitor cluster. Handle requests for new map
18 * versions, and periodically resend as needed. Also implement
19 * statfs() and umount().
20 *
21 * A small cluster of Ceph "monitors" are responsible for managing critical
22 * cluster configuration and state information. An odd number (e.g., 3, 5)
23 * of cmon daemons use a modified version of the Paxos part-time parliament
24 * algorithm to manage the MDS map (mds cluster membership), OSD map, and
25 * list of clients who have mounted the file system.
26 *
27 * We maintain an open, active session with a monitor at all times in order to
28 * receive timely MDSMap updates. We periodically send a keepalive byte on the
29 * TCP socket to ensure we detect a failure. If the connection does break, we
30 * randomly hunt for a new monitor. Once the connection is reestablished, we
31 * resend any outstanding requests.
32 */
33
34 static const struct ceph_connection_operations mon_con_ops;
35
36 static int __validate_auth(struct ceph_mon_client *monc);
37
38 /*
39 * Decode a monmap blob (e.g., during mount).
40 */
41 struct ceph_monmap *ceph_monmap_decode(void *p, void *end)
42 {
43 struct ceph_monmap *m = NULL;
44 int i, err = -EINVAL;
45 struct ceph_fsid fsid;
46 u32 epoch, num_mon;
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 p += sizeof(u16); /* skip version */
54
55 ceph_decode_need(&p, end, sizeof(fsid) + 2*sizeof(u32), bad);
56 ceph_decode_copy(&p, &fsid, sizeof(fsid));
57 epoch = ceph_decode_32(&p);
58
59 num_mon = ceph_decode_32(&p);
60 ceph_decode_need(&p, end, num_mon*sizeof(m->mon_inst[0]), bad);
61
62 if (num_mon >= CEPH_MAX_MON)
63 goto bad;
64 m = kmalloc(sizeof(*m) + sizeof(m->mon_inst[0])*num_mon, GFP_NOFS);
65 if (m == NULL)
66 return ERR_PTR(-ENOMEM);
67 m->fsid = fsid;
68 m->epoch = epoch;
69 m->num_mon = num_mon;
70 ceph_decode_copy(&p, m->mon_inst, num_mon*sizeof(m->mon_inst[0]));
71 for (i = 0; i < num_mon; i++)
72 ceph_decode_addr(&m->mon_inst[i].addr);
73
74 dout("monmap_decode epoch %d, num_mon %d\n", m->epoch,
75 m->num_mon);
76 for (i = 0; i < m->num_mon; i++)
77 dout("monmap_decode mon%d is %s\n", i,
78 ceph_pr_addr(&m->mon_inst[i].addr.in_addr));
79 return m;
80
81 bad:
82 dout("monmap_decode failed with %d\n", err);
83 kfree(m);
84 return ERR_PTR(err);
85 }
86
87 /*
88 * return true if *addr is included in the monmap.
89 */
90 int ceph_monmap_contains(struct ceph_monmap *m, struct ceph_entity_addr *addr)
91 {
92 int i;
93
94 for (i = 0; i < m->num_mon; i++)
95 if (memcmp(addr, &m->mon_inst[i].addr, sizeof(*addr)) == 0)
96 return 1;
97 return 0;
98 }
99
100 /*
101 * Send an auth request.
102 */
103 static void __send_prepared_auth_request(struct ceph_mon_client *monc, int len)
104 {
105 monc->pending_auth = 1;
106 monc->m_auth->front.iov_len = len;
107 monc->m_auth->hdr.front_len = cpu_to_le32(len);
108 ceph_msg_revoke(monc->m_auth);
109 ceph_msg_get(monc->m_auth); /* keep our ref */
110 ceph_con_send(&monc->con, monc->m_auth);
111 }
112
113 /*
114 * Close monitor session, if any.
115 */
116 static void __close_session(struct ceph_mon_client *monc)
117 {
118 dout("__close_session closing mon%d\n", monc->cur_mon);
119 ceph_msg_revoke(monc->m_auth);
120 ceph_msg_revoke_incoming(monc->m_auth_reply);
121 ceph_msg_revoke(monc->m_subscribe);
122 ceph_msg_revoke_incoming(monc->m_subscribe_ack);
123 ceph_con_close(&monc->con);
124
125 monc->pending_auth = 0;
126 ceph_auth_reset(monc->auth);
127 }
128
129 /*
130 * Pick a new monitor at random and set cur_mon. If we are repicking
131 * (i.e. cur_mon is already set), be sure to pick a different one.
132 */
133 static void pick_new_mon(struct ceph_mon_client *monc)
134 {
135 int old_mon = monc->cur_mon;
136
137 BUG_ON(monc->monmap->num_mon < 1);
138
139 if (monc->monmap->num_mon == 1) {
140 monc->cur_mon = 0;
141 } else {
142 int max = monc->monmap->num_mon;
143 int o = -1;
144 int n;
145
146 if (monc->cur_mon >= 0) {
147 if (monc->cur_mon < monc->monmap->num_mon)
148 o = monc->cur_mon;
149 if (o >= 0)
150 max--;
151 }
152
153 n = prandom_u32() % max;
154 if (o >= 0 && n >= o)
155 n++;
156
157 monc->cur_mon = n;
158 }
159
160 dout("%s mon%d -> mon%d out of %d mons\n", __func__, old_mon,
161 monc->cur_mon, monc->monmap->num_mon);
162 }
163
164 /*
165 * Open a session with a new monitor.
166 */
167 static void __open_session(struct ceph_mon_client *monc)
168 {
169 int ret;
170
171 pick_new_mon(monc);
172
173 monc->hunting = true;
174 if (monc->had_a_connection) {
175 monc->hunt_mult *= CEPH_MONC_HUNT_BACKOFF;
176 if (monc->hunt_mult > CEPH_MONC_HUNT_MAX_MULT)
177 monc->hunt_mult = CEPH_MONC_HUNT_MAX_MULT;
178 }
179
180 monc->sub_renew_after = jiffies; /* i.e., expired */
181 monc->sub_renew_sent = 0;
182
183 dout("%s opening mon%d\n", __func__, monc->cur_mon);
184 ceph_con_open(&monc->con, CEPH_ENTITY_TYPE_MON, monc->cur_mon,
185 &monc->monmap->mon_inst[monc->cur_mon].addr);
186
187 /*
188 * send an initial keepalive to ensure our timestamp is valid
189 * by the time we are in an OPENED state
190 */
191 ceph_con_keepalive(&monc->con);
192
193 /* initiate authentication handshake */
194 ret = ceph_auth_build_hello(monc->auth,
195 monc->m_auth->front.iov_base,
196 monc->m_auth->front_alloc_len);
197 BUG_ON(ret <= 0);
198 __send_prepared_auth_request(monc, ret);
199 }
200
201 static void reopen_session(struct ceph_mon_client *monc)
202 {
203 if (!monc->hunting)
204 pr_info("mon%d %s session lost, hunting for new mon\n",
205 monc->cur_mon, ceph_pr_addr(&monc->con.peer_addr.in_addr));
206
207 __close_session(monc);
208 __open_session(monc);
209 }
210
211 /*
212 * Reschedule delayed work timer.
213 */
214 static void __schedule_delayed(struct ceph_mon_client *monc)
215 {
216 unsigned long delay;
217
218 if (monc->hunting)
219 delay = CEPH_MONC_HUNT_INTERVAL * monc->hunt_mult;
220 else
221 delay = CEPH_MONC_PING_INTERVAL;
222
223 dout("__schedule_delayed after %lu\n", delay);
224 mod_delayed_work(system_wq, &monc->delayed_work,
225 round_jiffies_relative(delay));
226 }
227
228 const char *ceph_sub_str[] = {
229 [CEPH_SUB_MONMAP] = "monmap",
230 [CEPH_SUB_OSDMAP] = "osdmap",
231 [CEPH_SUB_FSMAP] = "fsmap.user",
232 [CEPH_SUB_MDSMAP] = "mdsmap",
233 };
234
235 /*
236 * Send subscribe request for one or more maps, according to
237 * monc->subs.
238 */
239 static void __send_subscribe(struct ceph_mon_client *monc)
240 {
241 struct ceph_msg *msg = monc->m_subscribe;
242 void *p = msg->front.iov_base;
243 void *const end = p + msg->front_alloc_len;
244 int num = 0;
245 int i;
246
247 dout("%s sent %lu\n", __func__, monc->sub_renew_sent);
248
249 BUG_ON(monc->cur_mon < 0);
250
251 if (!monc->sub_renew_sent)
252 monc->sub_renew_sent = jiffies | 1; /* never 0 */
253
254 msg->hdr.version = cpu_to_le16(2);
255
256 for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
257 if (monc->subs[i].want)
258 num++;
259 }
260 BUG_ON(num < 1); /* monmap sub is always there */
261 ceph_encode_32(&p, num);
262 for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
263 char buf[32];
264 int len;
265
266 if (!monc->subs[i].want)
267 continue;
268
269 len = sprintf(buf, "%s", ceph_sub_str[i]);
270 if (i == CEPH_SUB_MDSMAP &&
271 monc->fs_cluster_id != CEPH_FS_CLUSTER_ID_NONE)
272 len += sprintf(buf + len, ".%d", monc->fs_cluster_id);
273
274 dout("%s %s start %llu flags 0x%x\n", __func__, buf,
275 le64_to_cpu(monc->subs[i].item.start),
276 monc->subs[i].item.flags);
277 ceph_encode_string(&p, end, buf, len);
278 memcpy(p, &monc->subs[i].item, sizeof(monc->subs[i].item));
279 p += sizeof(monc->subs[i].item);
280 }
281
282 BUG_ON(p > end);
283 msg->front.iov_len = p - msg->front.iov_base;
284 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
285 ceph_msg_revoke(msg);
286 ceph_con_send(&monc->con, ceph_msg_get(msg));
287 }
288
289 static void handle_subscribe_ack(struct ceph_mon_client *monc,
290 struct ceph_msg *msg)
291 {
292 unsigned int seconds;
293 struct ceph_mon_subscribe_ack *h = msg->front.iov_base;
294
295 if (msg->front.iov_len < sizeof(*h))
296 goto bad;
297 seconds = le32_to_cpu(h->duration);
298
299 mutex_lock(&monc->mutex);
300 if (monc->sub_renew_sent) {
301 /*
302 * This is only needed for legacy (infernalis or older)
303 * MONs -- see delayed_work().
304 */
305 monc->sub_renew_after = monc->sub_renew_sent +
306 (seconds >> 1) * HZ - 1;
307 dout("%s sent %lu duration %d renew after %lu\n", __func__,
308 monc->sub_renew_sent, seconds, monc->sub_renew_after);
309 monc->sub_renew_sent = 0;
310 } else {
311 dout("%s sent %lu renew after %lu, ignoring\n", __func__,
312 monc->sub_renew_sent, monc->sub_renew_after);
313 }
314 mutex_unlock(&monc->mutex);
315 return;
316 bad:
317 pr_err("got corrupt subscribe-ack msg\n");
318 ceph_msg_dump(msg);
319 }
320
321 /*
322 * Register interest in a map
323 *
324 * @sub: one of CEPH_SUB_*
325 * @epoch: X for "every map since X", or 0 for "just the latest"
326 */
327 static bool __ceph_monc_want_map(struct ceph_mon_client *monc, int sub,
328 u32 epoch, bool continuous)
329 {
330 __le64 start = cpu_to_le64(epoch);
331 u8 flags = !continuous ? CEPH_SUBSCRIBE_ONETIME : 0;
332
333 dout("%s %s epoch %u continuous %d\n", __func__, ceph_sub_str[sub],
334 epoch, continuous);
335
336 if (monc->subs[sub].want &&
337 monc->subs[sub].item.start == start &&
338 monc->subs[sub].item.flags == flags)
339 return false;
340
341 monc->subs[sub].item.start = start;
342 monc->subs[sub].item.flags = flags;
343 monc->subs[sub].want = true;
344
345 return true;
346 }
347
348 bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
349 bool continuous)
350 {
351 bool need_request;
352
353 mutex_lock(&monc->mutex);
354 need_request = __ceph_monc_want_map(monc, sub, epoch, continuous);
355 mutex_unlock(&monc->mutex);
356
357 return need_request;
358 }
359 EXPORT_SYMBOL(ceph_monc_want_map);
360
361 /*
362 * Keep track of which maps we have
363 *
364 * @sub: one of CEPH_SUB_*
365 */
366 static void __ceph_monc_got_map(struct ceph_mon_client *monc, int sub,
367 u32 epoch)
368 {
369 dout("%s %s epoch %u\n", __func__, ceph_sub_str[sub], epoch);
370
371 if (monc->subs[sub].want) {
372 if (monc->subs[sub].item.flags & CEPH_SUBSCRIBE_ONETIME)
373 monc->subs[sub].want = false;
374 else
375 monc->subs[sub].item.start = cpu_to_le64(epoch + 1);
376 }
377
378 monc->subs[sub].have = epoch;
379 }
380
381 void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch)
382 {
383 mutex_lock(&monc->mutex);
384 __ceph_monc_got_map(monc, sub, epoch);
385 mutex_unlock(&monc->mutex);
386 }
387 EXPORT_SYMBOL(ceph_monc_got_map);
388
389 void ceph_monc_renew_subs(struct ceph_mon_client *monc)
390 {
391 mutex_lock(&monc->mutex);
392 __send_subscribe(monc);
393 mutex_unlock(&monc->mutex);
394 }
395 EXPORT_SYMBOL(ceph_monc_renew_subs);
396
397 /*
398 * Wait for an osdmap with a given epoch.
399 *
400 * @epoch: epoch to wait for
401 * @timeout: in jiffies, 0 means "wait forever"
402 */
403 int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
404 unsigned long timeout)
405 {
406 unsigned long started = jiffies;
407 long ret;
408
409 mutex_lock(&monc->mutex);
410 while (monc->subs[CEPH_SUB_OSDMAP].have < epoch) {
411 mutex_unlock(&monc->mutex);
412
413 if (timeout && time_after_eq(jiffies, started + timeout))
414 return -ETIMEDOUT;
415
416 ret = wait_event_interruptible_timeout(monc->client->auth_wq,
417 monc->subs[CEPH_SUB_OSDMAP].have >= epoch,
418 ceph_timeout_jiffies(timeout));
419 if (ret < 0)
420 return ret;
421
422 mutex_lock(&monc->mutex);
423 }
424
425 mutex_unlock(&monc->mutex);
426 return 0;
427 }
428 EXPORT_SYMBOL(ceph_monc_wait_osdmap);
429
430 /*
431 * Open a session with a random monitor. Request monmap and osdmap,
432 * which are waited upon in __ceph_open_session().
433 */
434 int ceph_monc_open_session(struct ceph_mon_client *monc)
435 {
436 mutex_lock(&monc->mutex);
437 __ceph_monc_want_map(monc, CEPH_SUB_MONMAP, 0, true);
438 __ceph_monc_want_map(monc, CEPH_SUB_OSDMAP, 0, false);
439 __open_session(monc);
440 __schedule_delayed(monc);
441 mutex_unlock(&monc->mutex);
442 return 0;
443 }
444 EXPORT_SYMBOL(ceph_monc_open_session);
445
446 static void ceph_monc_handle_map(struct ceph_mon_client *monc,
447 struct ceph_msg *msg)
448 {
449 struct ceph_client *client = monc->client;
450 struct ceph_monmap *monmap = NULL, *old = monc->monmap;
451 void *p, *end;
452
453 mutex_lock(&monc->mutex);
454
455 dout("handle_monmap\n");
456 p = msg->front.iov_base;
457 end = p + msg->front.iov_len;
458
459 monmap = ceph_monmap_decode(p, end);
460 if (IS_ERR(monmap)) {
461 pr_err("problem decoding monmap, %d\n",
462 (int)PTR_ERR(monmap));
463 goto out;
464 }
465
466 if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) {
467 kfree(monmap);
468 goto out;
469 }
470
471 client->monc.monmap = monmap;
472 kfree(old);
473
474 __ceph_monc_got_map(monc, CEPH_SUB_MONMAP, monc->monmap->epoch);
475 client->have_fsid = true;
476
477 out:
478 mutex_unlock(&monc->mutex);
479 wake_up_all(&client->auth_wq);
480 }
481
482 /*
483 * generic requests (currently statfs, mon_get_version)
484 */
485 DEFINE_RB_FUNCS(generic_request, struct ceph_mon_generic_request, tid, node)
486
487 static void release_generic_request(struct kref *kref)
488 {
489 struct ceph_mon_generic_request *req =
490 container_of(kref, struct ceph_mon_generic_request, kref);
491
492 dout("%s greq %p request %p reply %p\n", __func__, req, req->request,
493 req->reply);
494 WARN_ON(!RB_EMPTY_NODE(&req->node));
495
496 if (req->reply)
497 ceph_msg_put(req->reply);
498 if (req->request)
499 ceph_msg_put(req->request);
500
501 kfree(req);
502 }
503
504 static void put_generic_request(struct ceph_mon_generic_request *req)
505 {
506 if (req)
507 kref_put(&req->kref, release_generic_request);
508 }
509
510 static void get_generic_request(struct ceph_mon_generic_request *req)
511 {
512 kref_get(&req->kref);
513 }
514
515 static struct ceph_mon_generic_request *
516 alloc_generic_request(struct ceph_mon_client *monc, gfp_t gfp)
517 {
518 struct ceph_mon_generic_request *req;
519
520 req = kzalloc(sizeof(*req), gfp);
521 if (!req)
522 return NULL;
523
524 req->monc = monc;
525 kref_init(&req->kref);
526 RB_CLEAR_NODE(&req->node);
527 init_completion(&req->completion);
528
529 dout("%s greq %p\n", __func__, req);
530 return req;
531 }
532
533 static void register_generic_request(struct ceph_mon_generic_request *req)
534 {
535 struct ceph_mon_client *monc = req->monc;
536
537 WARN_ON(req->tid);
538
539 get_generic_request(req);
540 req->tid = ++monc->last_tid;
541 insert_generic_request(&monc->generic_request_tree, req);
542 }
543
544 static void send_generic_request(struct ceph_mon_client *monc,
545 struct ceph_mon_generic_request *req)
546 {
547 WARN_ON(!req->tid);
548
549 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
550 req->request->hdr.tid = cpu_to_le64(req->tid);
551 ceph_con_send(&monc->con, ceph_msg_get(req->request));
552 }
553
554 static void __finish_generic_request(struct ceph_mon_generic_request *req)
555 {
556 struct ceph_mon_client *monc = req->monc;
557
558 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
559 erase_generic_request(&monc->generic_request_tree, req);
560
561 ceph_msg_revoke(req->request);
562 ceph_msg_revoke_incoming(req->reply);
563 }
564
565 static void finish_generic_request(struct ceph_mon_generic_request *req)
566 {
567 __finish_generic_request(req);
568 put_generic_request(req);
569 }
570
571 static void complete_generic_request(struct ceph_mon_generic_request *req)
572 {
573 if (req->complete_cb)
574 req->complete_cb(req);
575 else
576 complete_all(&req->completion);
577 put_generic_request(req);
578 }
579
580 static void cancel_generic_request(struct ceph_mon_generic_request *req)
581 {
582 struct ceph_mon_client *monc = req->monc;
583 struct ceph_mon_generic_request *lookup_req;
584
585 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
586
587 mutex_lock(&monc->mutex);
588 lookup_req = lookup_generic_request(&monc->generic_request_tree,
589 req->tid);
590 if (lookup_req) {
591 WARN_ON(lookup_req != req);
592 finish_generic_request(req);
593 }
594
595 mutex_unlock(&monc->mutex);
596 }
597
598 static int wait_generic_request(struct ceph_mon_generic_request *req)
599 {
600 int ret;
601
602 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
603 ret = wait_for_completion_interruptible(&req->completion);
604 if (ret)
605 cancel_generic_request(req);
606 else
607 ret = req->result; /* completed */
608
609 return ret;
610 }
611
612 static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
613 struct ceph_msg_header *hdr,
614 int *skip)
615 {
616 struct ceph_mon_client *monc = con->private;
617 struct ceph_mon_generic_request *req;
618 u64 tid = le64_to_cpu(hdr->tid);
619 struct ceph_msg *m;
620
621 mutex_lock(&monc->mutex);
622 req = lookup_generic_request(&monc->generic_request_tree, tid);
623 if (!req) {
624 dout("get_generic_reply %lld dne\n", tid);
625 *skip = 1;
626 m = NULL;
627 } else {
628 dout("get_generic_reply %lld got %p\n", tid, req->reply);
629 *skip = 0;
630 m = ceph_msg_get(req->reply);
631 /*
632 * we don't need to track the connection reading into
633 * this reply because we only have one open connection
634 * at a time, ever.
635 */
636 }
637 mutex_unlock(&monc->mutex);
638 return m;
639 }
640
641 /*
642 * statfs
643 */
644 static void handle_statfs_reply(struct ceph_mon_client *monc,
645 struct ceph_msg *msg)
646 {
647 struct ceph_mon_generic_request *req;
648 struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
649 u64 tid = le64_to_cpu(msg->hdr.tid);
650
651 dout("%s msg %p tid %llu\n", __func__, msg, tid);
652
653 if (msg->front.iov_len != sizeof(*reply))
654 goto bad;
655
656 mutex_lock(&monc->mutex);
657 req = lookup_generic_request(&monc->generic_request_tree, tid);
658 if (!req) {
659 mutex_unlock(&monc->mutex);
660 return;
661 }
662
663 req->result = 0;
664 *req->u.st = reply->st; /* struct */
665 __finish_generic_request(req);
666 mutex_unlock(&monc->mutex);
667
668 complete_generic_request(req);
669 return;
670
671 bad:
672 pr_err("corrupt statfs reply, tid %llu\n", tid);
673 ceph_msg_dump(msg);
674 }
675
676 /*
677 * Do a synchronous statfs().
678 */
679 int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf)
680 {
681 struct ceph_mon_generic_request *req;
682 struct ceph_mon_statfs *h;
683 int ret = -ENOMEM;
684
685 req = alloc_generic_request(monc, GFP_NOFS);
686 if (!req)
687 goto out;
688
689 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS,
690 true);
691 if (!req->request)
692 goto out;
693
694 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 64, GFP_NOFS, true);
695 if (!req->reply)
696 goto out;
697
698 req->u.st = buf;
699
700 mutex_lock(&monc->mutex);
701 register_generic_request(req);
702 /* fill out request */
703 h = req->request->front.iov_base;
704 h->monhdr.have_version = 0;
705 h->monhdr.session_mon = cpu_to_le16(-1);
706 h->monhdr.session_mon_tid = 0;
707 h->fsid = monc->monmap->fsid;
708 send_generic_request(monc, req);
709 mutex_unlock(&monc->mutex);
710
711 ret = wait_generic_request(req);
712 out:
713 put_generic_request(req);
714 return ret;
715 }
716 EXPORT_SYMBOL(ceph_monc_do_statfs);
717
718 static void handle_get_version_reply(struct ceph_mon_client *monc,
719 struct ceph_msg *msg)
720 {
721 struct ceph_mon_generic_request *req;
722 u64 tid = le64_to_cpu(msg->hdr.tid);
723 void *p = msg->front.iov_base;
724 void *end = p + msg->front_alloc_len;
725 u64 handle;
726
727 dout("%s msg %p tid %llu\n", __func__, msg, tid);
728
729 ceph_decode_need(&p, end, 2*sizeof(u64), bad);
730 handle = ceph_decode_64(&p);
731 if (tid != 0 && tid != handle)
732 goto bad;
733
734 mutex_lock(&monc->mutex);
735 req = lookup_generic_request(&monc->generic_request_tree, handle);
736 if (!req) {
737 mutex_unlock(&monc->mutex);
738 return;
739 }
740
741 req->result = 0;
742 req->u.newest = ceph_decode_64(&p);
743 __finish_generic_request(req);
744 mutex_unlock(&monc->mutex);
745
746 complete_generic_request(req);
747 return;
748
749 bad:
750 pr_err("corrupt mon_get_version reply, tid %llu\n", tid);
751 ceph_msg_dump(msg);
752 }
753
754 static struct ceph_mon_generic_request *
755 __ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
756 ceph_monc_callback_t cb, u64 private_data)
757 {
758 struct ceph_mon_generic_request *req;
759
760 req = alloc_generic_request(monc, GFP_NOIO);
761 if (!req)
762 goto err_put_req;
763
764 req->request = ceph_msg_new(CEPH_MSG_MON_GET_VERSION,
765 sizeof(u64) + sizeof(u32) + strlen(what),
766 GFP_NOIO, true);
767 if (!req->request)
768 goto err_put_req;
769
770 req->reply = ceph_msg_new(CEPH_MSG_MON_GET_VERSION_REPLY, 32, GFP_NOIO,
771 true);
772 if (!req->reply)
773 goto err_put_req;
774
775 req->complete_cb = cb;
776 req->private_data = private_data;
777
778 mutex_lock(&monc->mutex);
779 register_generic_request(req);
780 {
781 void *p = req->request->front.iov_base;
782 void *const end = p + req->request->front_alloc_len;
783
784 ceph_encode_64(&p, req->tid); /* handle */
785 ceph_encode_string(&p, end, what, strlen(what));
786 WARN_ON(p != end);
787 }
788 send_generic_request(monc, req);
789 mutex_unlock(&monc->mutex);
790
791 return req;
792
793 err_put_req:
794 put_generic_request(req);
795 return ERR_PTR(-ENOMEM);
796 }
797
798 /*
799 * Send MMonGetVersion and wait for the reply.
800 *
801 * @what: one of "mdsmap", "osdmap" or "monmap"
802 */
803 int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
804 u64 *newest)
805 {
806 struct ceph_mon_generic_request *req;
807 int ret;
808
809 req = __ceph_monc_get_version(monc, what, NULL, 0);
810 if (IS_ERR(req))
811 return PTR_ERR(req);
812
813 ret = wait_generic_request(req);
814 if (!ret)
815 *newest = req->u.newest;
816
817 put_generic_request(req);
818 return ret;
819 }
820 EXPORT_SYMBOL(ceph_monc_get_version);
821
822 /*
823 * Send MMonGetVersion,
824 *
825 * @what: one of "mdsmap", "osdmap" or "monmap"
826 */
827 int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
828 ceph_monc_callback_t cb, u64 private_data)
829 {
830 struct ceph_mon_generic_request *req;
831
832 req = __ceph_monc_get_version(monc, what, cb, private_data);
833 if (IS_ERR(req))
834 return PTR_ERR(req);
835
836 put_generic_request(req);
837 return 0;
838 }
839 EXPORT_SYMBOL(ceph_monc_get_version_async);
840
841 static void handle_command_ack(struct ceph_mon_client *monc,
842 struct ceph_msg *msg)
843 {
844 struct ceph_mon_generic_request *req;
845 void *p = msg->front.iov_base;
846 void *const end = p + msg->front_alloc_len;
847 u64 tid = le64_to_cpu(msg->hdr.tid);
848
849 dout("%s msg %p tid %llu\n", __func__, msg, tid);
850
851 ceph_decode_need(&p, end, sizeof(struct ceph_mon_request_header) +
852 sizeof(u32), bad);
853 p += sizeof(struct ceph_mon_request_header);
854
855 mutex_lock(&monc->mutex);
856 req = lookup_generic_request(&monc->generic_request_tree, tid);
857 if (!req) {
858 mutex_unlock(&monc->mutex);
859 return;
860 }
861
862 req->result = ceph_decode_32(&p);
863 __finish_generic_request(req);
864 mutex_unlock(&monc->mutex);
865
866 complete_generic_request(req);
867 return;
868
869 bad:
870 pr_err("corrupt mon_command ack, tid %llu\n", tid);
871 ceph_msg_dump(msg);
872 }
873
874 int ceph_monc_blacklist_add(struct ceph_mon_client *monc,
875 struct ceph_entity_addr *client_addr)
876 {
877 struct ceph_mon_generic_request *req;
878 struct ceph_mon_command *h;
879 int ret = -ENOMEM;
880 int len;
881
882 req = alloc_generic_request(monc, GFP_NOIO);
883 if (!req)
884 goto out;
885
886 req->request = ceph_msg_new(CEPH_MSG_MON_COMMAND, 256, GFP_NOIO, true);
887 if (!req->request)
888 goto out;
889
890 req->reply = ceph_msg_new(CEPH_MSG_MON_COMMAND_ACK, 512, GFP_NOIO,
891 true);
892 if (!req->reply)
893 goto out;
894
895 mutex_lock(&monc->mutex);
896 register_generic_request(req);
897 h = req->request->front.iov_base;
898 h->monhdr.have_version = 0;
899 h->monhdr.session_mon = cpu_to_le16(-1);
900 h->monhdr.session_mon_tid = 0;
901 h->fsid = monc->monmap->fsid;
902 h->num_strs = cpu_to_le32(1);
903 len = sprintf(h->str, "{ \"prefix\": \"osd blacklist\", \
904 \"blacklistop\": \"add\", \
905 \"addr\": \"%pISpc/%u\" }",
906 &client_addr->in_addr, le32_to_cpu(client_addr->nonce));
907 h->str_len = cpu_to_le32(len);
908 send_generic_request(monc, req);
909 mutex_unlock(&monc->mutex);
910
911 ret = wait_generic_request(req);
912 out:
913 put_generic_request(req);
914 return ret;
915 }
916 EXPORT_SYMBOL(ceph_monc_blacklist_add);
917
918 /*
919 * Resend pending generic requests.
920 */
921 static void __resend_generic_request(struct ceph_mon_client *monc)
922 {
923 struct ceph_mon_generic_request *req;
924 struct rb_node *p;
925
926 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
927 req = rb_entry(p, struct ceph_mon_generic_request, node);
928 ceph_msg_revoke(req->request);
929 ceph_msg_revoke_incoming(req->reply);
930 ceph_con_send(&monc->con, ceph_msg_get(req->request));
931 }
932 }
933
934 /*
935 * Delayed work. If we haven't mounted yet, retry. Otherwise,
936 * renew/retry subscription as needed (in case it is timing out, or we
937 * got an ENOMEM). And keep the monitor connection alive.
938 */
939 static void delayed_work(struct work_struct *work)
940 {
941 struct ceph_mon_client *monc =
942 container_of(work, struct ceph_mon_client, delayed_work.work);
943
944 dout("monc delayed_work\n");
945 mutex_lock(&monc->mutex);
946 if (monc->hunting) {
947 dout("%s continuing hunt\n", __func__);
948 reopen_session(monc);
949 } else {
950 int is_auth = ceph_auth_is_authenticated(monc->auth);
951 if (ceph_con_keepalive_expired(&monc->con,
952 CEPH_MONC_PING_TIMEOUT)) {
953 dout("monc keepalive timeout\n");
954 is_auth = 0;
955 reopen_session(monc);
956 }
957
958 if (!monc->hunting) {
959 ceph_con_keepalive(&monc->con);
960 __validate_auth(monc);
961 }
962
963 if (is_auth &&
964 !(monc->con.peer_features & CEPH_FEATURE_MON_STATEFUL_SUB)) {
965 unsigned long now = jiffies;
966
967 dout("%s renew subs? now %lu renew after %lu\n",
968 __func__, now, monc->sub_renew_after);
969 if (time_after_eq(now, monc->sub_renew_after))
970 __send_subscribe(monc);
971 }
972 }
973 __schedule_delayed(monc);
974 mutex_unlock(&monc->mutex);
975 }
976
977 /*
978 * On startup, we build a temporary monmap populated with the IPs
979 * provided by mount(2).
980 */
981 static int build_initial_monmap(struct ceph_mon_client *monc)
982 {
983 struct ceph_options *opt = monc->client->options;
984 struct ceph_entity_addr *mon_addr = opt->mon_addr;
985 int num_mon = opt->num_mon;
986 int i;
987
988 /* build initial monmap */
989 monc->monmap = kzalloc(sizeof(*monc->monmap) +
990 num_mon*sizeof(monc->monmap->mon_inst[0]),
991 GFP_KERNEL);
992 if (!monc->monmap)
993 return -ENOMEM;
994 for (i = 0; i < num_mon; i++) {
995 monc->monmap->mon_inst[i].addr = mon_addr[i];
996 monc->monmap->mon_inst[i].addr.nonce = 0;
997 monc->monmap->mon_inst[i].name.type =
998 CEPH_ENTITY_TYPE_MON;
999 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
1000 }
1001 monc->monmap->num_mon = num_mon;
1002 return 0;
1003 }
1004
1005 int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
1006 {
1007 int err = 0;
1008
1009 dout("init\n");
1010 memset(monc, 0, sizeof(*monc));
1011 monc->client = cl;
1012 monc->monmap = NULL;
1013 mutex_init(&monc->mutex);
1014
1015 err = build_initial_monmap(monc);
1016 if (err)
1017 goto out;
1018
1019 /* connection */
1020 /* authentication */
1021 monc->auth = ceph_auth_init(cl->options->name,
1022 cl->options->key);
1023 if (IS_ERR(monc->auth)) {
1024 err = PTR_ERR(monc->auth);
1025 goto out_monmap;
1026 }
1027 monc->auth->want_keys =
1028 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
1029 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
1030
1031 /* msgs */
1032 err = -ENOMEM;
1033 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
1034 sizeof(struct ceph_mon_subscribe_ack),
1035 GFP_KERNEL, true);
1036 if (!monc->m_subscribe_ack)
1037 goto out_auth;
1038
1039 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 128,
1040 GFP_KERNEL, true);
1041 if (!monc->m_subscribe)
1042 goto out_subscribe_ack;
1043
1044 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096,
1045 GFP_KERNEL, true);
1046 if (!monc->m_auth_reply)
1047 goto out_subscribe;
1048
1049 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_KERNEL, true);
1050 monc->pending_auth = 0;
1051 if (!monc->m_auth)
1052 goto out_auth_reply;
1053
1054 ceph_con_init(&monc->con, monc, &mon_con_ops,
1055 &monc->client->msgr);
1056
1057 monc->cur_mon = -1;
1058 monc->had_a_connection = false;
1059 monc->hunt_mult = 1;
1060
1061 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
1062 monc->generic_request_tree = RB_ROOT;
1063 monc->last_tid = 0;
1064
1065 monc->fs_cluster_id = CEPH_FS_CLUSTER_ID_NONE;
1066
1067 return 0;
1068
1069 out_auth_reply:
1070 ceph_msg_put(monc->m_auth_reply);
1071 out_subscribe:
1072 ceph_msg_put(monc->m_subscribe);
1073 out_subscribe_ack:
1074 ceph_msg_put(monc->m_subscribe_ack);
1075 out_auth:
1076 ceph_auth_destroy(monc->auth);
1077 out_monmap:
1078 kfree(monc->monmap);
1079 out:
1080 return err;
1081 }
1082 EXPORT_SYMBOL(ceph_monc_init);
1083
1084 void ceph_monc_stop(struct ceph_mon_client *monc)
1085 {
1086 dout("stop\n");
1087 cancel_delayed_work_sync(&monc->delayed_work);
1088
1089 mutex_lock(&monc->mutex);
1090 __close_session(monc);
1091 monc->cur_mon = -1;
1092 mutex_unlock(&monc->mutex);
1093
1094 /*
1095 * flush msgr queue before we destroy ourselves to ensure that:
1096 * - any work that references our embedded con is finished.
1097 * - any osd_client or other work that may reference an authorizer
1098 * finishes before we shut down the auth subsystem.
1099 */
1100 ceph_msgr_flush();
1101
1102 ceph_auth_destroy(monc->auth);
1103
1104 WARN_ON(!RB_EMPTY_ROOT(&monc->generic_request_tree));
1105
1106 ceph_msg_put(monc->m_auth);
1107 ceph_msg_put(monc->m_auth_reply);
1108 ceph_msg_put(monc->m_subscribe);
1109 ceph_msg_put(monc->m_subscribe_ack);
1110
1111 kfree(monc->monmap);
1112 }
1113 EXPORT_SYMBOL(ceph_monc_stop);
1114
1115 static void finish_hunting(struct ceph_mon_client *monc)
1116 {
1117 if (monc->hunting) {
1118 dout("%s found mon%d\n", __func__, monc->cur_mon);
1119 monc->hunting = false;
1120 monc->had_a_connection = true;
1121 monc->hunt_mult /= 2; /* reduce by 50% */
1122 if (monc->hunt_mult < 1)
1123 monc->hunt_mult = 1;
1124 }
1125 }
1126
1127 static void handle_auth_reply(struct ceph_mon_client *monc,
1128 struct ceph_msg *msg)
1129 {
1130 int ret;
1131 int was_auth = 0;
1132
1133 mutex_lock(&monc->mutex);
1134 was_auth = ceph_auth_is_authenticated(monc->auth);
1135 monc->pending_auth = 0;
1136 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
1137 msg->front.iov_len,
1138 monc->m_auth->front.iov_base,
1139 monc->m_auth->front_alloc_len);
1140 if (ret > 0) {
1141 __send_prepared_auth_request(monc, ret);
1142 goto out;
1143 }
1144
1145 finish_hunting(monc);
1146
1147 if (ret < 0) {
1148 monc->client->auth_err = ret;
1149 } else if (!was_auth && ceph_auth_is_authenticated(monc->auth)) {
1150 dout("authenticated, starting session\n");
1151
1152 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
1153 monc->client->msgr.inst.name.num =
1154 cpu_to_le64(monc->auth->global_id);
1155
1156 __send_subscribe(monc);
1157 __resend_generic_request(monc);
1158
1159 pr_info("mon%d %s session established\n", monc->cur_mon,
1160 ceph_pr_addr(&monc->con.peer_addr.in_addr));
1161 }
1162
1163 out:
1164 mutex_unlock(&monc->mutex);
1165 if (monc->client->auth_err < 0)
1166 wake_up_all(&monc->client->auth_wq);
1167 }
1168
1169 static int __validate_auth(struct ceph_mon_client *monc)
1170 {
1171 int ret;
1172
1173 if (monc->pending_auth)
1174 return 0;
1175
1176 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
1177 monc->m_auth->front_alloc_len);
1178 if (ret <= 0)
1179 return ret; /* either an error, or no need to authenticate */
1180 __send_prepared_auth_request(monc, ret);
1181 return 0;
1182 }
1183
1184 int ceph_monc_validate_auth(struct ceph_mon_client *monc)
1185 {
1186 int ret;
1187
1188 mutex_lock(&monc->mutex);
1189 ret = __validate_auth(monc);
1190 mutex_unlock(&monc->mutex);
1191 return ret;
1192 }
1193 EXPORT_SYMBOL(ceph_monc_validate_auth);
1194
1195 /*
1196 * handle incoming message
1197 */
1198 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1199 {
1200 struct ceph_mon_client *monc = con->private;
1201 int type = le16_to_cpu(msg->hdr.type);
1202
1203 if (!monc)
1204 return;
1205
1206 switch (type) {
1207 case CEPH_MSG_AUTH_REPLY:
1208 handle_auth_reply(monc, msg);
1209 break;
1210
1211 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1212 handle_subscribe_ack(monc, msg);
1213 break;
1214
1215 case CEPH_MSG_STATFS_REPLY:
1216 handle_statfs_reply(monc, msg);
1217 break;
1218
1219 case CEPH_MSG_MON_GET_VERSION_REPLY:
1220 handle_get_version_reply(monc, msg);
1221 break;
1222
1223 case CEPH_MSG_MON_COMMAND_ACK:
1224 handle_command_ack(monc, msg);
1225 break;
1226
1227 case CEPH_MSG_MON_MAP:
1228 ceph_monc_handle_map(monc, msg);
1229 break;
1230
1231 case CEPH_MSG_OSD_MAP:
1232 ceph_osdc_handle_map(&monc->client->osdc, msg);
1233 break;
1234
1235 default:
1236 /* can the chained handler handle it? */
1237 if (monc->client->extra_mon_dispatch &&
1238 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1239 break;
1240
1241 pr_err("received unknown message type %d %s\n", type,
1242 ceph_msg_type_name(type));
1243 }
1244 ceph_msg_put(msg);
1245 }
1246
1247 /*
1248 * Allocate memory for incoming message
1249 */
1250 static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1251 struct ceph_msg_header *hdr,
1252 int *skip)
1253 {
1254 struct ceph_mon_client *monc = con->private;
1255 int type = le16_to_cpu(hdr->type);
1256 int front_len = le32_to_cpu(hdr->front_len);
1257 struct ceph_msg *m = NULL;
1258
1259 *skip = 0;
1260
1261 switch (type) {
1262 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1263 m = ceph_msg_get(monc->m_subscribe_ack);
1264 break;
1265 case CEPH_MSG_STATFS_REPLY:
1266 case CEPH_MSG_MON_COMMAND_ACK:
1267 return get_generic_reply(con, hdr, skip);
1268 case CEPH_MSG_AUTH_REPLY:
1269 m = ceph_msg_get(monc->m_auth_reply);
1270 break;
1271 case CEPH_MSG_MON_GET_VERSION_REPLY:
1272 if (le64_to_cpu(hdr->tid) != 0)
1273 return get_generic_reply(con, hdr, skip);
1274
1275 /*
1276 * Older OSDs don't set reply tid even if the orignal
1277 * request had a non-zero tid. Workaround this weirdness
1278 * by falling through to the allocate case.
1279 */
1280 case CEPH_MSG_MON_MAP:
1281 case CEPH_MSG_MDS_MAP:
1282 case CEPH_MSG_OSD_MAP:
1283 case CEPH_MSG_FS_MAP_USER:
1284 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1285 if (!m)
1286 return NULL; /* ENOMEM--return skip == 0 */
1287 break;
1288 }
1289
1290 if (!m) {
1291 pr_info("alloc_msg unknown type %d\n", type);
1292 *skip = 1;
1293 } else if (front_len > m->front_alloc_len) {
1294 pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
1295 front_len, m->front_alloc_len,
1296 (unsigned int)con->peer_name.type,
1297 le64_to_cpu(con->peer_name.num));
1298 ceph_msg_put(m);
1299 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1300 }
1301
1302 return m;
1303 }
1304
1305 /*
1306 * If the monitor connection resets, pick a new monitor and resubmit
1307 * any pending requests.
1308 */
1309 static void mon_fault(struct ceph_connection *con)
1310 {
1311 struct ceph_mon_client *monc = con->private;
1312
1313 mutex_lock(&monc->mutex);
1314 dout("%s mon%d\n", __func__, monc->cur_mon);
1315 if (monc->cur_mon >= 0) {
1316 if (!monc->hunting) {
1317 dout("%s hunting for new mon\n", __func__);
1318 reopen_session(monc);
1319 __schedule_delayed(monc);
1320 } else {
1321 dout("%s already hunting\n", __func__);
1322 }
1323 }
1324 mutex_unlock(&monc->mutex);
1325 }
1326
1327 /*
1328 * We can ignore refcounting on the connection struct, as all references
1329 * will come from the messenger workqueue, which is drained prior to
1330 * mon_client destruction.
1331 */
1332 static struct ceph_connection *con_get(struct ceph_connection *con)
1333 {
1334 return con;
1335 }
1336
1337 static void con_put(struct ceph_connection *con)
1338 {
1339 }
1340
1341 static const struct ceph_connection_operations mon_con_ops = {
1342 .get = con_get,
1343 .put = con_put,
1344 .dispatch = dispatch,
1345 .fault = mon_fault,
1346 .alloc_msg = mon_alloc_msg,
1347 };
Linux with added FPC-III support