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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / net / ceph / mon_client.c
blob1547107f48544e9690319e4fe9415968448a9f87
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/module.h>
5 #include <linux/types.h>
6 #include <linux/slab.h>
7 #include <linux/random.h>
8 #include <linux/sched.h>
9
10 #include <linux/ceph/ceph_features.h>
11 #include <linux/ceph/mon_client.h>
12 #include <linux/ceph/libceph.h>
13 #include <linux/ceph/debugfs.h>
14 #include <linux/ceph/decode.h>
15 #include <linux/ceph/auth.h>
16
17 /*
18 * Interact with Ceph monitor cluster. Handle requests for new map
19 * versions, and periodically resend as needed. Also implement
20 * statfs() and umount().
21 *
22 * A small cluster of Ceph "monitors" are responsible for managing critical
23 * cluster configuration and state information. An odd number (e.g., 3, 5)
24 * of cmon daemons use a modified version of the Paxos part-time parliament
25 * algorithm to manage the MDS map (mds cluster membership), OSD map, and
26 * list of clients who have mounted the file system.
27 *
28 * We maintain an open, active session with a monitor at all times in order to
29 * receive timely MDSMap updates. We periodically send a keepalive byte on the
30 * TCP socket to ensure we detect a failure. If the connection does break, we
31 * randomly hunt for a new monitor. Once the connection is reestablished, we
32 * resend any outstanding requests.
33 */
34
35 static const struct ceph_connection_operations mon_con_ops;
36
37 static int __validate_auth(struct ceph_mon_client *monc);
38
39 /*
40 * Decode a monmap blob (e.g., during mount).
41 */
42 struct ceph_monmap *ceph_monmap_decode(void *p, void *end)
43 {
44 struct ceph_monmap *m = NULL;
45 int i, err = -EINVAL;
46 struct ceph_fsid fsid;
47 u32 epoch, num_mon;
48 u32 len;
49
50 ceph_decode_32_safe(&p, end, len, bad);
51 ceph_decode_need(&p, end, len, bad);
52
53 dout("monmap_decode %p %p len %d\n", p, end, (int)(end-p));
54 p += sizeof(u16); /* skip version */
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
82 bad:
83 dout("monmap_decode failed with %d\n", err);
84 kfree(m);
85 return ERR_PTR(err);
86 }
87
88 /*
89 * return true if *addr is included in the monmap.
90 */
91 int 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 * Send an auth request.
103 */
104 static 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); /* keep our ref */
111 ceph_con_send(&monc->con, monc->m_auth);
112 }
113
114 /*
115 * Close monitor session, if any.
116 */
117 static 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 * Pick a new monitor at random and set cur_mon. If we are repicking
132 * (i.e. cur_mon is already set), be sure to pick a different one.
133 */
134 static 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 * Open a session with a new monitor.
167 */
168 static 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; /* i.e., expired */
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 * send an initial keepalive to ensure our timestamp is valid
190 * by the time we are in an OPENED state
191 */
192 ceph_con_keepalive(&monc->con);
193
194 /* initiate authentication handshake */
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
202 static 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 * Reschedule delayed work timer.
214 */
215 static 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
229 const 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 * Send subscribe request for one or more maps, according to
238 * monc->subs.
239 */
240 static 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; /* never 0 */
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); /* monmap sub is always there */
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
290 static 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 /*
303 * This is only needed for legacy (infernalis or older)
304 * MONs -- see delayed_work().
305 */
306 monc->sub_renew_after = monc->sub_renew_sent +
307 (seconds >> 1) * HZ - 1;
308 dout("%s sent %lu duration %d renew after %lu\n", __func__,
309 monc->sub_renew_sent, seconds, monc->sub_renew_after);
310 monc->sub_renew_sent = 0;
311 } else {
312 dout("%s sent %lu renew after %lu, ignoring\n", __func__,
313 monc->sub_renew_sent, monc->sub_renew_after);
314 }
315 mutex_unlock(&monc->mutex);
316 return;
317 bad:
318 pr_err("got corrupt subscribe-ack msg\n");
319 ceph_msg_dump(msg);
320 }
321
322 /*
323 * Register interest in a map
324 *
325 * @sub: one of CEPH_SUB_*
326 * @epoch: X for "every map since X", or 0 for "just the latest"
327 */
328 static bool __ceph_monc_want_map(struct ceph_mon_client *monc, int sub,
329 u32 epoch, bool continuous)
330 {
331 __le64 start = cpu_to_le64(epoch);
332 u8 flags = !continuous ? CEPH_SUBSCRIBE_ONETIME : 0;
333
334 dout("%s %s epoch %u continuous %d\n", __func__, ceph_sub_str[sub],
335 epoch, continuous);
336
337 if (monc->subs[sub].want &&
338 monc->subs[sub].item.start == start &&
339 monc->subs[sub].item.flags == flags)
340 return false;
341
342 monc->subs[sub].item.start = start;
343 monc->subs[sub].item.flags = flags;
344 monc->subs[sub].want = true;
345
346 return true;
347 }
348
349 bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
350 bool continuous)
351 {
352 bool need_request;
353
354 mutex_lock(&monc->mutex);
355 need_request = __ceph_monc_want_map(monc, sub, epoch, continuous);
356 mutex_unlock(&monc->mutex);
357
358 return need_request;
359 }
360 EXPORT_SYMBOL(ceph_monc_want_map);
361
362 /*
363 * Keep track of which maps we have
364 *
365 * @sub: one of CEPH_SUB_*
366 */
367 static void __ceph_monc_got_map(struct ceph_mon_client *monc, int sub,
368 u32 epoch)
369 {
370 dout("%s %s epoch %u\n", __func__, ceph_sub_str[sub], epoch);
371
372 if (monc->subs[sub].want) {
373 if (monc->subs[sub].item.flags & CEPH_SUBSCRIBE_ONETIME)
374 monc->subs[sub].want = false;
375 else
376 monc->subs[sub].item.start = cpu_to_le64(epoch + 1);
377 }
378
379 monc->subs[sub].have = epoch;
380 }
381
382 void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch)
383 {
384 mutex_lock(&monc->mutex);
385 __ceph_monc_got_map(monc, sub, epoch);
386 mutex_unlock(&monc->mutex);
387 }
388 EXPORT_SYMBOL(ceph_monc_got_map);
389
390 void ceph_monc_renew_subs(struct ceph_mon_client *monc)
391 {
392 mutex_lock(&monc->mutex);
393 __send_subscribe(monc);
394 mutex_unlock(&monc->mutex);
395 }
396 EXPORT_SYMBOL(ceph_monc_renew_subs);
397
398 /*
399 * Wait for an osdmap with a given epoch.
400 *
401 * @epoch: epoch to wait for
402 * @timeout: in jiffies, 0 means "wait forever"
403 */
404 int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
405 unsigned long timeout)
406 {
407 unsigned long started = jiffies;
408 long ret;
409
410 mutex_lock(&monc->mutex);
411 while (monc->subs[CEPH_SUB_OSDMAP].have < epoch) {
412 mutex_unlock(&monc->mutex);
413
414 if (timeout && time_after_eq(jiffies, started + timeout))
415 return -ETIMEDOUT;
416
417 ret = wait_event_interruptible_timeout(monc->client->auth_wq,
418 monc->subs[CEPH_SUB_OSDMAP].have >= epoch,
419 ceph_timeout_jiffies(timeout));
420 if (ret < 0)
421 return ret;
422
423 mutex_lock(&monc->mutex);
424 }
425
426 mutex_unlock(&monc->mutex);
427 return 0;
428 }
429 EXPORT_SYMBOL(ceph_monc_wait_osdmap);
430
431 /*
432 * Open a session with a random monitor. Request monmap and osdmap,
433 * which are waited upon in __ceph_open_session().
434 */
435 int ceph_monc_open_session(struct ceph_mon_client *monc)
436 {
437 mutex_lock(&monc->mutex);
438 __ceph_monc_want_map(monc, CEPH_SUB_MONMAP, 0, true);
439 __ceph_monc_want_map(monc, CEPH_SUB_OSDMAP, 0, false);
440 __open_session(monc);
441 __schedule_delayed(monc);
442 mutex_unlock(&monc->mutex);
443 return 0;
444 }
445 EXPORT_SYMBOL(ceph_monc_open_session);
446
447 static void ceph_monc_handle_map(struct ceph_mon_client *monc,
448 struct ceph_msg *msg)
449 {
450 struct ceph_client *client = monc->client;
451 struct ceph_monmap *monmap = NULL, *old = monc->monmap;
452 void *p, *end;
453
454 mutex_lock(&monc->mutex);
455
456 dout("handle_monmap\n");
457 p = msg->front.iov_base;
458 end = p + msg->front.iov_len;
459
460 monmap = ceph_monmap_decode(p, end);
461 if (IS_ERR(monmap)) {
462 pr_err("problem decoding monmap, %d\n",
463 (int)PTR_ERR(monmap));
464 goto out;
465 }
466
467 if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) {
468 kfree(monmap);
469 goto out;
470 }
471
472 client->monc.monmap = monmap;
473 kfree(old);
474
475 __ceph_monc_got_map(monc, CEPH_SUB_MONMAP, monc->monmap->epoch);
476 client->have_fsid = true;
477
478 out:
479 mutex_unlock(&monc->mutex);
480 wake_up_all(&client->auth_wq);
481 }
482
483 /*
484 * generic requests (currently statfs, mon_get_version)
485 */
486 DEFINE_RB_FUNCS(generic_request, struct ceph_mon_generic_request, tid, node)
487
488 static void release_generic_request(struct kref *kref)
489 {
490 struct ceph_mon_generic_request *req =
491 container_of(kref, struct ceph_mon_generic_request, kref);
492
493 dout("%s greq %p request %p reply %p\n", __func__, req, req->request,
494 req->reply);
495 WARN_ON(!RB_EMPTY_NODE(&req->node));
496
497 if (req->reply)
498 ceph_msg_put(req->reply);
499 if (req->request)
500 ceph_msg_put(req->request);
501
502 kfree(req);
503 }
504
505 static void put_generic_request(struct ceph_mon_generic_request *req)
506 {
507 if (req)
508 kref_put(&req->kref, release_generic_request);
509 }
510
511 static void get_generic_request(struct ceph_mon_generic_request *req)
512 {
513 kref_get(&req->kref);
514 }
515
516 static struct ceph_mon_generic_request *
517 alloc_generic_request(struct ceph_mon_client *monc, gfp_t gfp)
518 {
519 struct ceph_mon_generic_request *req;
520
521 req = kzalloc(sizeof(*req), gfp);
522 if (!req)
523 return NULL;
524
525 req->monc = monc;
526 kref_init(&req->kref);
527 RB_CLEAR_NODE(&req->node);
528 init_completion(&req->completion);
529
530 dout("%s greq %p\n", __func__, req);
531 return req;
532 }
533
534 static void register_generic_request(struct ceph_mon_generic_request *req)
535 {
536 struct ceph_mon_client *monc = req->monc;
537
538 WARN_ON(req->tid);
539
540 get_generic_request(req);
541 req->tid = ++monc->last_tid;
542 insert_generic_request(&monc->generic_request_tree, req);
543 }
544
545 static void send_generic_request(struct ceph_mon_client *monc,
546 struct ceph_mon_generic_request *req)
547 {
548 WARN_ON(!req->tid);
549
550 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
551 req->request->hdr.tid = cpu_to_le64(req->tid);
552 ceph_con_send(&monc->con, ceph_msg_get(req->request));
553 }
554
555 static void __finish_generic_request(struct ceph_mon_generic_request *req)
556 {
557 struct ceph_mon_client *monc = req->monc;
558
559 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
560 erase_generic_request(&monc->generic_request_tree, req);
561
562 ceph_msg_revoke(req->request);
563 ceph_msg_revoke_incoming(req->reply);
564 }
565
566 static void finish_generic_request(struct ceph_mon_generic_request *req)
567 {
568 __finish_generic_request(req);
569 put_generic_request(req);
570 }
571
572 static void complete_generic_request(struct ceph_mon_generic_request *req)
573 {
574 if (req->complete_cb)
575 req->complete_cb(req);
576 else
577 complete_all(&req->completion);
578 put_generic_request(req);
579 }
580
581 static void cancel_generic_request(struct ceph_mon_generic_request *req)
582 {
583 struct ceph_mon_client *monc = req->monc;
584 struct ceph_mon_generic_request *lookup_req;
585
586 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
587
588 mutex_lock(&monc->mutex);
589 lookup_req = lookup_generic_request(&monc->generic_request_tree,
590 req->tid);
591 if (lookup_req) {
592 WARN_ON(lookup_req != req);
593 finish_generic_request(req);
594 }
595
596 mutex_unlock(&monc->mutex);
597 }
598
599 static int wait_generic_request(struct ceph_mon_generic_request *req)
600 {
601 int ret;
602
603 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
604 ret = wait_for_completion_interruptible(&req->completion);
605 if (ret)
606 cancel_generic_request(req);
607 else
608 ret = req->result; /* completed */
609
610 return ret;
611 }
612
613 static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
614 struct ceph_msg_header *hdr,
615 int *skip)
616 {
617 struct ceph_mon_client *monc = con->private;
618 struct ceph_mon_generic_request *req;
619 u64 tid = le64_to_cpu(hdr->tid);
620 struct ceph_msg *m;
621
622 mutex_lock(&monc->mutex);
623 req = lookup_generic_request(&monc->generic_request_tree, tid);
624 if (!req) {
625 dout("get_generic_reply %lld dne\n", tid);
626 *skip = 1;
627 m = NULL;
628 } else {
629 dout("get_generic_reply %lld got %p\n", tid, req->reply);
630 *skip = 0;
631 m = ceph_msg_get(req->reply);
632 /*
633 * we don't need to track the connection reading into
634 * this reply because we only have one open connection
635 * at a time, ever.
636 */
637 }
638 mutex_unlock(&monc->mutex);
639 return m;
640 }
641
642 /*
643 * statfs
644 */
645 static void handle_statfs_reply(struct ceph_mon_client *monc,
646 struct ceph_msg *msg)
647 {
648 struct ceph_mon_generic_request *req;
649 struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
650 u64 tid = le64_to_cpu(msg->hdr.tid);
651
652 dout("%s msg %p tid %llu\n", __func__, msg, tid);
653
654 if (msg->front.iov_len != sizeof(*reply))
655 goto bad;
656
657 mutex_lock(&monc->mutex);
658 req = lookup_generic_request(&monc->generic_request_tree, tid);
659 if (!req) {
660 mutex_unlock(&monc->mutex);
661 return;
662 }
663
664 req->result = 0;
665 *req->u.st = reply->st; /* struct */
666 __finish_generic_request(req);
667 mutex_unlock(&monc->mutex);
668
669 complete_generic_request(req);
670 return;
671
672 bad:
673 pr_err("corrupt statfs reply, tid %llu\n", tid);
674 ceph_msg_dump(msg);
675 }
676
677 /*
678 * Do a synchronous statfs().
679 */
680 int ceph_monc_do_statfs(struct ceph_mon_client *monc, u64 data_pool,
681 struct ceph_statfs *buf)
682 {
683 struct ceph_mon_generic_request *req;
684 struct ceph_mon_statfs *h;
685 int ret = -ENOMEM;
686
687 req = alloc_generic_request(monc, GFP_NOFS);
688 if (!req)
689 goto out;
690
691 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS,
692 true);
693 if (!req->request)
694 goto out;
695
696 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 64, GFP_NOFS, true);
697 if (!req->reply)
698 goto out;
699
700 req->u.st = buf;
701 req->request->hdr.version = cpu_to_le16(2);
702
703 mutex_lock(&monc->mutex);
704 register_generic_request(req);
705 /* fill out request */
706 h = req->request->front.iov_base;
707 h->monhdr.have_version = 0;
708 h->monhdr.session_mon = cpu_to_le16(-1);
709 h->monhdr.session_mon_tid = 0;
710 h->fsid = monc->monmap->fsid;
711 h->contains_data_pool = (data_pool != CEPH_NOPOOL);
712 h->data_pool = cpu_to_le64(data_pool);
713 send_generic_request(monc, req);
714 mutex_unlock(&monc->mutex);
715
716 ret = wait_generic_request(req);
717 out:
718 put_generic_request(req);
719 return ret;
720 }
721 EXPORT_SYMBOL(ceph_monc_do_statfs);
722
723 static void handle_get_version_reply(struct ceph_mon_client *monc,
724 struct ceph_msg *msg)
725 {
726 struct ceph_mon_generic_request *req;
727 u64 tid = le64_to_cpu(msg->hdr.tid);
728 void *p = msg->front.iov_base;
729 void *end = p + msg->front_alloc_len;
730 u64 handle;
731
732 dout("%s msg %p tid %llu\n", __func__, msg, tid);
733
734 ceph_decode_need(&p, end, 2*sizeof(u64), bad);
735 handle = ceph_decode_64(&p);
736 if (tid != 0 && tid != handle)
737 goto bad;
738
739 mutex_lock(&monc->mutex);
740 req = lookup_generic_request(&monc->generic_request_tree, handle);
741 if (!req) {
742 mutex_unlock(&monc->mutex);
743 return;
744 }
745
746 req->result = 0;
747 req->u.newest = ceph_decode_64(&p);
748 __finish_generic_request(req);
749 mutex_unlock(&monc->mutex);
750
751 complete_generic_request(req);
752 return;
753
754 bad:
755 pr_err("corrupt mon_get_version reply, tid %llu\n", tid);
756 ceph_msg_dump(msg);
757 }
758
759 static struct ceph_mon_generic_request *
760 __ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
761 ceph_monc_callback_t cb, u64 private_data)
762 {
763 struct ceph_mon_generic_request *req;
764
765 req = alloc_generic_request(monc, GFP_NOIO);
766 if (!req)
767 goto err_put_req;
768
769 req->request = ceph_msg_new(CEPH_MSG_MON_GET_VERSION,
770 sizeof(u64) + sizeof(u32) + strlen(what),
771 GFP_NOIO, true);
772 if (!req->request)
773 goto err_put_req;
774
775 req->reply = ceph_msg_new(CEPH_MSG_MON_GET_VERSION_REPLY, 32, GFP_NOIO,
776 true);
777 if (!req->reply)
778 goto err_put_req;
779
780 req->complete_cb = cb;
781 req->private_data = private_data;
782
783 mutex_lock(&monc->mutex);
784 register_generic_request(req);
785 {
786 void *p = req->request->front.iov_base;
787 void *const end = p + req->request->front_alloc_len;
788
789 ceph_encode_64(&p, req->tid); /* handle */
790 ceph_encode_string(&p, end, what, strlen(what));
791 WARN_ON(p != end);
792 }
793 send_generic_request(monc, req);
794 mutex_unlock(&monc->mutex);
795
796 return req;
797
798 err_put_req:
799 put_generic_request(req);
800 return ERR_PTR(-ENOMEM);
801 }
802
803 /*
804 * Send MMonGetVersion and wait for the reply.
805 *
806 * @what: one of "mdsmap", "osdmap" or "monmap"
807 */
808 int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
809 u64 *newest)
810 {
811 struct ceph_mon_generic_request *req;
812 int ret;
813
814 req = __ceph_monc_get_version(monc, what, NULL, 0);
815 if (IS_ERR(req))
816 return PTR_ERR(req);
817
818 ret = wait_generic_request(req);
819 if (!ret)
820 *newest = req->u.newest;
821
822 put_generic_request(req);
823 return ret;
824 }
825 EXPORT_SYMBOL(ceph_monc_get_version);
826
827 /*
828 * Send MMonGetVersion,
829 *
830 * @what: one of "mdsmap", "osdmap" or "monmap"
831 */
832 int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
833 ceph_monc_callback_t cb, u64 private_data)
834 {
835 struct ceph_mon_generic_request *req;
836
837 req = __ceph_monc_get_version(monc, what, cb, private_data);
838 if (IS_ERR(req))
839 return PTR_ERR(req);
840
841 put_generic_request(req);
842 return 0;
843 }
844 EXPORT_SYMBOL(ceph_monc_get_version_async);
845
846 static void handle_command_ack(struct ceph_mon_client *monc,
847 struct ceph_msg *msg)
848 {
849 struct ceph_mon_generic_request *req;
850 void *p = msg->front.iov_base;
851 void *const end = p + msg->front_alloc_len;
852 u64 tid = le64_to_cpu(msg->hdr.tid);
853
854 dout("%s msg %p tid %llu\n", __func__, msg, tid);
855
856 ceph_decode_need(&p, end, sizeof(struct ceph_mon_request_header) +
857 sizeof(u32), bad);
858 p += sizeof(struct ceph_mon_request_header);
859
860 mutex_lock(&monc->mutex);
861 req = lookup_generic_request(&monc->generic_request_tree, tid);
862 if (!req) {
863 mutex_unlock(&monc->mutex);
864 return;
865 }
866
867 req->result = ceph_decode_32(&p);
868 __finish_generic_request(req);
869 mutex_unlock(&monc->mutex);
870
871 complete_generic_request(req);
872 return;
873
874 bad:
875 pr_err("corrupt mon_command ack, tid %llu\n", tid);
876 ceph_msg_dump(msg);
877 }
878
879 int ceph_monc_blacklist_add(struct ceph_mon_client *monc,
880 struct ceph_entity_addr *client_addr)
881 {
882 struct ceph_mon_generic_request *req;
883 struct ceph_mon_command *h;
884 int ret = -ENOMEM;
885 int len;
886
887 req = alloc_generic_request(monc, GFP_NOIO);
888 if (!req)
889 goto out;
890
891 req->request = ceph_msg_new(CEPH_MSG_MON_COMMAND, 256, GFP_NOIO, true);
892 if (!req->request)
893 goto out;
894
895 req->reply = ceph_msg_new(CEPH_MSG_MON_COMMAND_ACK, 512, GFP_NOIO,
896 true);
897 if (!req->reply)
898 goto out;
899
900 mutex_lock(&monc->mutex);
901 register_generic_request(req);
902 h = req->request->front.iov_base;
903 h->monhdr.have_version = 0;
904 h->monhdr.session_mon = cpu_to_le16(-1);
905 h->monhdr.session_mon_tid = 0;
906 h->fsid = monc->monmap->fsid;
907 h->num_strs = cpu_to_le32(1);
908 len = sprintf(h->str, "{ \"prefix\": \"osd blacklist\", \
909 \"blacklistop\": \"add\", \
910 \"addr\": \"%pISpc/%u\" }",
911 &client_addr->in_addr, le32_to_cpu(client_addr->nonce));
912 h->str_len = cpu_to_le32(len);
913 send_generic_request(monc, req);
914 mutex_unlock(&monc->mutex);
915
916 ret = wait_generic_request(req);
917 out:
918 put_generic_request(req);
919 return ret;
920 }
921 EXPORT_SYMBOL(ceph_monc_blacklist_add);
922
923 /*
924 * Resend pending generic requests.
925 */
926 static void __resend_generic_request(struct ceph_mon_client *monc)
927 {
928 struct ceph_mon_generic_request *req;
929 struct rb_node *p;
930
931 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
932 req = rb_entry(p, struct ceph_mon_generic_request, node);
933 ceph_msg_revoke(req->request);
934 ceph_msg_revoke_incoming(req->reply);
935 ceph_con_send(&monc->con, ceph_msg_get(req->request));
936 }
937 }
938
939 /*
940 * Delayed work. If we haven't mounted yet, retry. Otherwise,
941 * renew/retry subscription as needed (in case it is timing out, or we
942 * got an ENOMEM). And keep the monitor connection alive.
943 */
944 static void delayed_work(struct work_struct *work)
945 {
946 struct ceph_mon_client *monc =
947 container_of(work, struct ceph_mon_client, delayed_work.work);
948
949 dout("monc delayed_work\n");
950 mutex_lock(&monc->mutex);
951 if (monc->hunting) {
952 dout("%s continuing hunt\n", __func__);
953 reopen_session(monc);
954 } else {
955 int is_auth = ceph_auth_is_authenticated(monc->auth);
956 if (ceph_con_keepalive_expired(&monc->con,
957 CEPH_MONC_PING_TIMEOUT)) {
958 dout("monc keepalive timeout\n");
959 is_auth = 0;
960 reopen_session(monc);
961 }
962
963 if (!monc->hunting) {
964 ceph_con_keepalive(&monc->con);
965 __validate_auth(monc);
966 }
967
968 if (is_auth &&
969 !(monc->con.peer_features & CEPH_FEATURE_MON_STATEFUL_SUB)) {
970 unsigned long now = jiffies;
971
972 dout("%s renew subs? now %lu renew after %lu\n",
973 __func__, now, monc->sub_renew_after);
974 if (time_after_eq(now, monc->sub_renew_after))
975 __send_subscribe(monc);
976 }
977 }
978 __schedule_delayed(monc);
979 mutex_unlock(&monc->mutex);
980 }
981
982 /*
983 * On startup, we build a temporary monmap populated with the IPs
984 * provided by mount(2).
985 */
986 static int build_initial_monmap(struct ceph_mon_client *monc)
987 {
988 struct ceph_options *opt = monc->client->options;
989 struct ceph_entity_addr *mon_addr = opt->mon_addr;
990 int num_mon = opt->num_mon;
991 int i;
992
993 /* build initial monmap */
994 monc->monmap = kzalloc(sizeof(*monc->monmap) +
995 num_mon*sizeof(monc->monmap->mon_inst[0]),
996 GFP_KERNEL);
997 if (!monc->monmap)
998 return -ENOMEM;
999 for (i = 0; i < num_mon; i++) {
1000 monc->monmap->mon_inst[i].addr = mon_addr[i];
1001 monc->monmap->mon_inst[i].addr.nonce = 0;
1002 monc->monmap->mon_inst[i].name.type =
1003 CEPH_ENTITY_TYPE_MON;
1004 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
1005 }
1006 monc->monmap->num_mon = num_mon;
1007 return 0;
1008 }
1009
1010 int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
1011 {
1012 int err = 0;
1013
1014 dout("init\n");
1015 memset(monc, 0, sizeof(*monc));
1016 monc->client = cl;
1017 monc->monmap = NULL;
1018 mutex_init(&monc->mutex);
1019
1020 err = build_initial_monmap(monc);
1021 if (err)
1022 goto out;
1023
1024 /* connection */
1025 /* authentication */
1026 monc->auth = ceph_auth_init(cl->options->name,
1027 cl->options->key);
1028 if (IS_ERR(monc->auth)) {
1029 err = PTR_ERR(monc->auth);
1030 goto out_monmap;
1031 }
1032 monc->auth->want_keys =
1033 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
1034 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
1035
1036 /* msgs */
1037 err = -ENOMEM;
1038 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
1039 sizeof(struct ceph_mon_subscribe_ack),
1040 GFP_KERNEL, true);
1041 if (!monc->m_subscribe_ack)
1042 goto out_auth;
1043
1044 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 128,
1045 GFP_KERNEL, true);
1046 if (!monc->m_subscribe)
1047 goto out_subscribe_ack;
1048
1049 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096,
1050 GFP_KERNEL, true);
1051 if (!monc->m_auth_reply)
1052 goto out_subscribe;
1053
1054 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_KERNEL, true);
1055 monc->pending_auth = 0;
1056 if (!monc->m_auth)
1057 goto out_auth_reply;
1058
1059 ceph_con_init(&monc->con, monc, &mon_con_ops,
1060 &monc->client->msgr);
1061
1062 monc->cur_mon = -1;
1063 monc->had_a_connection = false;
1064 monc->hunt_mult = 1;
1065
1066 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
1067 monc->generic_request_tree = RB_ROOT;
1068 monc->last_tid = 0;
1069
1070 monc->fs_cluster_id = CEPH_FS_CLUSTER_ID_NONE;
1071
1072 return 0;
1073
1074 out_auth_reply:
1075 ceph_msg_put(monc->m_auth_reply);
1076 out_subscribe:
1077 ceph_msg_put(monc->m_subscribe);
1078 out_subscribe_ack:
1079 ceph_msg_put(monc->m_subscribe_ack);
1080 out_auth:
1081 ceph_auth_destroy(monc->auth);
1082 out_monmap:
1083 kfree(monc->monmap);
1084 out:
1085 return err;
1086 }
1087 EXPORT_SYMBOL(ceph_monc_init);
1088
1089 void ceph_monc_stop(struct ceph_mon_client *monc)
1090 {
1091 dout("stop\n");
1092 cancel_delayed_work_sync(&monc->delayed_work);
1093
1094 mutex_lock(&monc->mutex);
1095 __close_session(monc);
1096 monc->cur_mon = -1;
1097 mutex_unlock(&monc->mutex);
1098
1099 /*
1100 * flush msgr queue before we destroy ourselves to ensure that:
1101 * - any work that references our embedded con is finished.
1102 * - any osd_client or other work that may reference an authorizer
1103 * finishes before we shut down the auth subsystem.
1104 */
1105 ceph_msgr_flush();
1106
1107 ceph_auth_destroy(monc->auth);
1108
1109 WARN_ON(!RB_EMPTY_ROOT(&monc->generic_request_tree));
1110
1111 ceph_msg_put(monc->m_auth);
1112 ceph_msg_put(monc->m_auth_reply);
1113 ceph_msg_put(monc->m_subscribe);
1114 ceph_msg_put(monc->m_subscribe_ack);
1115
1116 kfree(monc->monmap);
1117 }
1118 EXPORT_SYMBOL(ceph_monc_stop);
1119
1120 static void finish_hunting(struct ceph_mon_client *monc)
1121 {
1122 if (monc->hunting) {
1123 dout("%s found mon%d\n", __func__, monc->cur_mon);
1124 monc->hunting = false;
1125 monc->had_a_connection = true;
1126 monc->hunt_mult /= 2; /* reduce by 50% */
1127 if (monc->hunt_mult < 1)
1128 monc->hunt_mult = 1;
1129 }
1130 }
1131
1132 static void handle_auth_reply(struct ceph_mon_client *monc,
1133 struct ceph_msg *msg)
1134 {
1135 int ret;
1136 int was_auth = 0;
1137
1138 mutex_lock(&monc->mutex);
1139 was_auth = ceph_auth_is_authenticated(monc->auth);
1140 monc->pending_auth = 0;
1141 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
1142 msg->front.iov_len,
1143 monc->m_auth->front.iov_base,
1144 monc->m_auth->front_alloc_len);
1145 if (ret > 0) {
1146 __send_prepared_auth_request(monc, ret);
1147 goto out;
1148 }
1149
1150 finish_hunting(monc);
1151
1152 if (ret < 0) {
1153 monc->client->auth_err = ret;
1154 } else if (!was_auth && ceph_auth_is_authenticated(monc->auth)) {
1155 dout("authenticated, starting session\n");
1156
1157 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
1158 monc->client->msgr.inst.name.num =
1159 cpu_to_le64(monc->auth->global_id);
1160
1161 __send_subscribe(monc);
1162 __resend_generic_request(monc);
1163
1164 pr_info("mon%d %s session established\n", monc->cur_mon,
1165 ceph_pr_addr(&monc->con.peer_addr.in_addr));
1166 }
1167
1168 out:
1169 mutex_unlock(&monc->mutex);
1170 if (monc->client->auth_err < 0)
1171 wake_up_all(&monc->client->auth_wq);
1172 }
1173
1174 static int __validate_auth(struct ceph_mon_client *monc)
1175 {
1176 int ret;
1177
1178 if (monc->pending_auth)
1179 return 0;
1180
1181 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
1182 monc->m_auth->front_alloc_len);
1183 if (ret <= 0)
1184 return ret; /* either an error, or no need to authenticate */
1185 __send_prepared_auth_request(monc, ret);
1186 return 0;
1187 }
1188
1189 int ceph_monc_validate_auth(struct ceph_mon_client *monc)
1190 {
1191 int ret;
1192
1193 mutex_lock(&monc->mutex);
1194 ret = __validate_auth(monc);
1195 mutex_unlock(&monc->mutex);
1196 return ret;
1197 }
1198 EXPORT_SYMBOL(ceph_monc_validate_auth);
1199
1200 /*
1201 * handle incoming message
1202 */
1203 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1204 {
1205 struct ceph_mon_client *monc = con->private;
1206 int type = le16_to_cpu(msg->hdr.type);
1207
1208 if (!monc)
1209 return;
1210
1211 switch (type) {
1212 case CEPH_MSG_AUTH_REPLY:
1213 handle_auth_reply(monc, msg);
1214 break;
1215
1216 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1217 handle_subscribe_ack(monc, msg);
1218 break;
1219
1220 case CEPH_MSG_STATFS_REPLY:
1221 handle_statfs_reply(monc, msg);
1222 break;
1223
1224 case CEPH_MSG_MON_GET_VERSION_REPLY:
1225 handle_get_version_reply(monc, msg);
1226 break;
1227
1228 case CEPH_MSG_MON_COMMAND_ACK:
1229 handle_command_ack(monc, msg);
1230 break;
1231
1232 case CEPH_MSG_MON_MAP:
1233 ceph_monc_handle_map(monc, msg);
1234 break;
1235
1236 case CEPH_MSG_OSD_MAP:
1237 ceph_osdc_handle_map(&monc->client->osdc, msg);
1238 break;
1239
1240 default:
1241 /* can the chained handler handle it? */
1242 if (monc->client->extra_mon_dispatch &&
1243 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1244 break;
1245
1246 pr_err("received unknown message type %d %s\n", type,
1247 ceph_msg_type_name(type));
1248 }
1249 ceph_msg_put(msg);
1250 }
1251
1252 /*
1253 * Allocate memory for incoming message
1254 */
1255 static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1256 struct ceph_msg_header *hdr,
1257 int *skip)
1258 {
1259 struct ceph_mon_client *monc = con->private;
1260 int type = le16_to_cpu(hdr->type);
1261 int front_len = le32_to_cpu(hdr->front_len);
1262 struct ceph_msg *m = NULL;
1263
1264 *skip = 0;
1265
1266 switch (type) {
1267 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1268 m = ceph_msg_get(monc->m_subscribe_ack);
1269 break;
1270 case CEPH_MSG_STATFS_REPLY:
1271 case CEPH_MSG_MON_COMMAND_ACK:
1272 return get_generic_reply(con, hdr, skip);
1273 case CEPH_MSG_AUTH_REPLY:
1274 m = ceph_msg_get(monc->m_auth_reply);
1275 break;
1276 case CEPH_MSG_MON_GET_VERSION_REPLY:
1277 if (le64_to_cpu(hdr->tid) != 0)
1278 return get_generic_reply(con, hdr, skip);
1279
1280 /*
1281 * Older OSDs don't set reply tid even if the orignal
1282 * request had a non-zero tid. Work around this weirdness
1283 * by allocating a new message.
1284 */
1285 /* fall through */
1286 case CEPH_MSG_MON_MAP:
1287 case CEPH_MSG_MDS_MAP:
1288 case CEPH_MSG_OSD_MAP:
1289 case CEPH_MSG_FS_MAP_USER:
1290 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1291 if (!m)
1292 return NULL; /* ENOMEM--return skip == 0 */
1293 break;
1294 }
1295
1296 if (!m) {
1297 pr_info("alloc_msg unknown type %d\n", type);
1298 *skip = 1;
1299 } else if (front_len > m->front_alloc_len) {
1300 pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
1301 front_len, m->front_alloc_len,
1302 (unsigned int)con->peer_name.type,
1303 le64_to_cpu(con->peer_name.num));
1304 ceph_msg_put(m);
1305 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1306 }
1307
1308 return m;
1309 }
1310
1311 /*
1312 * If the monitor connection resets, pick a new monitor and resubmit
1313 * any pending requests.
1314 */
1315 static void mon_fault(struct ceph_connection *con)
1316 {
1317 struct ceph_mon_client *monc = con->private;
1318
1319 mutex_lock(&monc->mutex);
1320 dout("%s mon%d\n", __func__, monc->cur_mon);
1321 if (monc->cur_mon >= 0) {
1322 if (!monc->hunting) {
1323 dout("%s hunting for new mon\n", __func__);
1324 reopen_session(monc);
1325 __schedule_delayed(monc);
1326 } else {
1327 dout("%s already hunting\n", __func__);
1328 }
1329 }
1330 mutex_unlock(&monc->mutex);
1331 }
1332
1333 /*
1334 * We can ignore refcounting on the connection struct, as all references
1335 * will come from the messenger workqueue, which is drained prior to
1336 * mon_client destruction.
1337 */
1338 static struct ceph_connection *con_get(struct ceph_connection *con)
1339 {
1340 return con;
1341 }
1342
1343 static void con_put(struct ceph_connection *con)
1344 {
1345 }
1346
1347 static const struct ceph_connection_operations mon_con_ops = {
1348 .get = con_get,
1349 .put = con_put,
1350 .dispatch = dispatch,
1351 .fault = mon_fault,
1352 .alloc_msg = mon_alloc_msg,
1353 };
CRIS linux kernel tree