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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu
[deliverable/linux.git] / net / ceph / mon_client.c
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 * Interact with Ceph monitor cluster. Handle requests for new map
17 * versions, and periodically resend as needed. Also implement
18 * statfs() and umount().
19 *
20 * A small cluster of Ceph "monitors" are responsible for managing critical
21 * cluster configuration and state information. An odd number (e.g., 3, 5)
22 * of cmon daemons use a modified version of the Paxos part-time parliament
23 * algorithm to manage the MDS map (mds cluster membership), OSD map, and
24 * list of clients who have mounted the file system.
25 *
26 * We maintain an open, active session with a monitor at all times in order to
27 * receive timely MDSMap updates. We periodically send a keepalive byte on the
28 * TCP socket to ensure we detect a failure. If the connection does break, we
29 * randomly hunt for a new monitor. Once the connection is reestablished, we
30 * resend any outstanding requests.
31 */
32
33 static const struct ceph_connection_operations mon_con_ops;
34
35 static int __validate_auth(struct ceph_mon_client *monc);
36
37 /*
38 * Decode a monmap blob (e.g., during mount).
39 */
40 struct 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
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 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;
313 bad:
314 pr_err("got corrupt subscribe-ack msg\n");
315 ceph_msg_dump(msg);
316 }
317
318 /*
319 * Register interest in a map
320 *
321 * @sub: one of CEPH_SUB_*
322 * @epoch: X for "every map since X", or 0 for "just the latest"
323 */
324 static 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
345 bool 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 }
356 EXPORT_SYMBOL(ceph_monc_want_map);
357
358 /*
359 * Keep track of which maps we have
360 *
361 * @sub: one of CEPH_SUB_*
362 */
363 static 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
378 void 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 }
384 EXPORT_SYMBOL(ceph_monc_got_map);
385
386 void 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 }
392 EXPORT_SYMBOL(ceph_monc_renew_subs);
393
394 /*
395 * Wait for an osdmap with a given epoch.
396 *
397 * @epoch: epoch to wait for
398 * @timeout: in jiffies, 0 means "wait forever"
399 */
400 int 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 }
425 EXPORT_SYMBOL(ceph_monc_wait_osdmap);
426
427 /*
428 * Open a session with a random monitor. Request monmap and osdmap,
429 * which are waited upon in __ceph_open_session().
430 */
431 int 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 }
441 EXPORT_SYMBOL(ceph_monc_open_session);
442
443 static 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
474 out:
475 mutex_unlock(&monc->mutex);
476 wake_up_all(&client->auth_wq);
477 }
478
479 /*
480 * generic requests (currently statfs, mon_get_version)
481 */
482 DEFINE_RB_FUNCS(generic_request, struct ceph_mon_generic_request, tid, node)
483
484 static 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
501 static void put_generic_request(struct ceph_mon_generic_request *req)
502 {
503 if (req)
504 kref_put(&req->kref, release_generic_request);
505 }
506
507 static void get_generic_request(struct ceph_mon_generic_request *req)
508 {
509 kref_get(&req->kref);
510 }
511
512 static struct ceph_mon_generic_request *
513 alloc_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
530 static 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
541 static 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
551 static 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
562 static void finish_generic_request(struct ceph_mon_generic_request *req)
563 {
564 __finish_generic_request(req);
565 put_generic_request(req);
566 }
567
568 static 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
577 static 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
595 static 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; /* completed */
605
606 return ret;
607 }
608
609 static 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 * we don't need to track the connection reading into
630 * this reply because we only have one open connection
631 * at a time, ever.
632 */
633 }
634 mutex_unlock(&monc->mutex);
635 return m;
636 }
637
638 /*
639 * statfs
640 */
641 static 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; /* struct */
662 __finish_generic_request(req);
663 mutex_unlock(&monc->mutex);
664
665 complete_generic_request(req);
666 return;
667
668 bad:
669 pr_err("corrupt statfs reply, tid %llu\n", tid);
670 ceph_msg_dump(msg);
671 }
672
673 /*
674 * Do a synchronous statfs().
675 */
676 int 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 /* fill out request */
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);
709 out:
710 put_generic_request(req);
711 return ret;
712 }
713 EXPORT_SYMBOL(ceph_monc_do_statfs);
714
715 static 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
746 bad:
747 pr_err("corrupt mon_get_version reply, tid %llu\n", tid);
748 ceph_msg_dump(msg);
749 }
750
751 static 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); /* handle */
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
790 err_put_req:
791 put_generic_request(req);
792 return ERR_PTR(-ENOMEM);
793 }
794
795 /*
796 * Send MMonGetVersion and wait for the reply.
797 *
798 * @what: one of "mdsmap", "osdmap" or "monmap"
799 */
800 int 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 }
817 EXPORT_SYMBOL(ceph_monc_get_version);
818
819 /*
820 * Send MMonGetVersion,
821 *
822 * @what: one of "mdsmap", "osdmap" or "monmap"
823 */
824 int 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 }
836 EXPORT_SYMBOL(ceph_monc_get_version_async);
837
838 /*
839 * Resend pending generic requests.
840 */
841 static void __resend_generic_request(struct ceph_mon_client *monc)
842 {
843 struct ceph_mon_generic_request *req;
844 struct rb_node *p;
845
846 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
847 req = rb_entry(p, struct ceph_mon_generic_request, node);
848 ceph_msg_revoke(req->request);
849 ceph_msg_revoke_incoming(req->reply);
850 ceph_con_send(&monc->con, ceph_msg_get(req->request));
851 }
852 }
853
854 /*
855 * Delayed work. If we haven't mounted yet, retry. Otherwise,
856 * renew/retry subscription as needed (in case it is timing out, or we
857 * got an ENOMEM). And keep the monitor connection alive.
858 */
859 static void delayed_work(struct work_struct *work)
860 {
861 struct ceph_mon_client *monc =
862 container_of(work, struct ceph_mon_client, delayed_work.work);
863
864 dout("monc delayed_work\n");
865 mutex_lock(&monc->mutex);
866 if (monc->hunting) {
867 dout("%s continuing hunt\n", __func__);
868 reopen_session(monc);
869 } else {
870 int is_auth = ceph_auth_is_authenticated(monc->auth);
871 if (ceph_con_keepalive_expired(&monc->con,
872 CEPH_MONC_PING_TIMEOUT)) {
873 dout("monc keepalive timeout\n");
874 is_auth = 0;
875 reopen_session(monc);
876 }
877
878 if (!monc->hunting) {
879 ceph_con_keepalive(&monc->con);
880 __validate_auth(monc);
881 }
882
883 if (is_auth) {
884 unsigned long now = jiffies;
885
886 dout("%s renew subs? now %lu renew after %lu\n",
887 __func__, now, monc->sub_renew_after);
888 if (time_after_eq(now, monc->sub_renew_after))
889 __send_subscribe(monc);
890 }
891 }
892 __schedule_delayed(monc);
893 mutex_unlock(&monc->mutex);
894 }
895
896 /*
897 * On startup, we build a temporary monmap populated with the IPs
898 * provided by mount(2).
899 */
900 static int build_initial_monmap(struct ceph_mon_client *monc)
901 {
902 struct ceph_options *opt = monc->client->options;
903 struct ceph_entity_addr *mon_addr = opt->mon_addr;
904 int num_mon = opt->num_mon;
905 int i;
906
907 /* build initial monmap */
908 monc->monmap = kzalloc(sizeof(*monc->monmap) +
909 num_mon*sizeof(monc->monmap->mon_inst[0]),
910 GFP_KERNEL);
911 if (!monc->monmap)
912 return -ENOMEM;
913 for (i = 0; i < num_mon; i++) {
914 monc->monmap->mon_inst[i].addr = mon_addr[i];
915 monc->monmap->mon_inst[i].addr.nonce = 0;
916 monc->monmap->mon_inst[i].name.type =
917 CEPH_ENTITY_TYPE_MON;
918 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
919 }
920 monc->monmap->num_mon = num_mon;
921 return 0;
922 }
923
924 int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
925 {
926 int err = 0;
927
928 dout("init\n");
929 memset(monc, 0, sizeof(*monc));
930 monc->client = cl;
931 monc->monmap = NULL;
932 mutex_init(&monc->mutex);
933
934 err = build_initial_monmap(monc);
935 if (err)
936 goto out;
937
938 /* connection */
939 /* authentication */
940 monc->auth = ceph_auth_init(cl->options->name,
941 cl->options->key);
942 if (IS_ERR(monc->auth)) {
943 err = PTR_ERR(monc->auth);
944 goto out_monmap;
945 }
946 monc->auth->want_keys =
947 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
948 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
949
950 /* msgs */
951 err = -ENOMEM;
952 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
953 sizeof(struct ceph_mon_subscribe_ack),
954 GFP_NOFS, true);
955 if (!monc->m_subscribe_ack)
956 goto out_auth;
957
958 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 128, GFP_NOFS,
959 true);
960 if (!monc->m_subscribe)
961 goto out_subscribe_ack;
962
963 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS,
964 true);
965 if (!monc->m_auth_reply)
966 goto out_subscribe;
967
968 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS, true);
969 monc->pending_auth = 0;
970 if (!monc->m_auth)
971 goto out_auth_reply;
972
973 ceph_con_init(&monc->con, monc, &mon_con_ops,
974 &monc->client->msgr);
975
976 monc->cur_mon = -1;
977 monc->had_a_connection = false;
978 monc->hunt_mult = 1;
979
980 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
981 monc->generic_request_tree = RB_ROOT;
982 monc->last_tid = 0;
983
984 monc->fs_cluster_id = CEPH_FS_CLUSTER_ID_NONE;
985
986 return 0;
987
988 out_auth_reply:
989 ceph_msg_put(monc->m_auth_reply);
990 out_subscribe:
991 ceph_msg_put(monc->m_subscribe);
992 out_subscribe_ack:
993 ceph_msg_put(monc->m_subscribe_ack);
994 out_auth:
995 ceph_auth_destroy(monc->auth);
996 out_monmap:
997 kfree(monc->monmap);
998 out:
999 return err;
1000 }
1001 EXPORT_SYMBOL(ceph_monc_init);
1002
1003 void ceph_monc_stop(struct ceph_mon_client *monc)
1004 {
1005 dout("stop\n");
1006 cancel_delayed_work_sync(&monc->delayed_work);
1007
1008 mutex_lock(&monc->mutex);
1009 __close_session(monc);
1010 monc->cur_mon = -1;
1011 mutex_unlock(&monc->mutex);
1012
1013 /*
1014 * flush msgr queue before we destroy ourselves to ensure that:
1015 * - any work that references our embedded con is finished.
1016 * - any osd_client or other work that may reference an authorizer
1017 * finishes before we shut down the auth subsystem.
1018 */
1019 ceph_msgr_flush();
1020
1021 ceph_auth_destroy(monc->auth);
1022
1023 WARN_ON(!RB_EMPTY_ROOT(&monc->generic_request_tree));
1024
1025 ceph_msg_put(monc->m_auth);
1026 ceph_msg_put(monc->m_auth_reply);
1027 ceph_msg_put(monc->m_subscribe);
1028 ceph_msg_put(monc->m_subscribe_ack);
1029
1030 kfree(monc->monmap);
1031 }
1032 EXPORT_SYMBOL(ceph_monc_stop);
1033
1034 static void finish_hunting(struct ceph_mon_client *monc)
1035 {
1036 if (monc->hunting) {
1037 dout("%s found mon%d\n", __func__, monc->cur_mon);
1038 monc->hunting = false;
1039 monc->had_a_connection = true;
1040 monc->hunt_mult /= 2; /* reduce by 50% */
1041 if (monc->hunt_mult < 1)
1042 monc->hunt_mult = 1;
1043 }
1044 }
1045
1046 static void handle_auth_reply(struct ceph_mon_client *monc,
1047 struct ceph_msg *msg)
1048 {
1049 int ret;
1050 int was_auth = 0;
1051
1052 mutex_lock(&monc->mutex);
1053 was_auth = ceph_auth_is_authenticated(monc->auth);
1054 monc->pending_auth = 0;
1055 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
1056 msg->front.iov_len,
1057 monc->m_auth->front.iov_base,
1058 monc->m_auth->front_alloc_len);
1059 if (ret > 0) {
1060 __send_prepared_auth_request(monc, ret);
1061 goto out;
1062 }
1063
1064 finish_hunting(monc);
1065
1066 if (ret < 0) {
1067 monc->client->auth_err = ret;
1068 } else if (!was_auth && ceph_auth_is_authenticated(monc->auth)) {
1069 dout("authenticated, starting session\n");
1070
1071 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
1072 monc->client->msgr.inst.name.num =
1073 cpu_to_le64(monc->auth->global_id);
1074
1075 __send_subscribe(monc);
1076 __resend_generic_request(monc);
1077
1078 pr_info("mon%d %s session established\n", monc->cur_mon,
1079 ceph_pr_addr(&monc->con.peer_addr.in_addr));
1080 }
1081
1082 out:
1083 mutex_unlock(&monc->mutex);
1084 if (monc->client->auth_err < 0)
1085 wake_up_all(&monc->client->auth_wq);
1086 }
1087
1088 static int __validate_auth(struct ceph_mon_client *monc)
1089 {
1090 int ret;
1091
1092 if (monc->pending_auth)
1093 return 0;
1094
1095 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
1096 monc->m_auth->front_alloc_len);
1097 if (ret <= 0)
1098 return ret; /* either an error, or no need to authenticate */
1099 __send_prepared_auth_request(monc, ret);
1100 return 0;
1101 }
1102
1103 int ceph_monc_validate_auth(struct ceph_mon_client *monc)
1104 {
1105 int ret;
1106
1107 mutex_lock(&monc->mutex);
1108 ret = __validate_auth(monc);
1109 mutex_unlock(&monc->mutex);
1110 return ret;
1111 }
1112 EXPORT_SYMBOL(ceph_monc_validate_auth);
1113
1114 /*
1115 * handle incoming message
1116 */
1117 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1118 {
1119 struct ceph_mon_client *monc = con->private;
1120 int type = le16_to_cpu(msg->hdr.type);
1121
1122 if (!monc)
1123 return;
1124
1125 switch (type) {
1126 case CEPH_MSG_AUTH_REPLY:
1127 handle_auth_reply(monc, msg);
1128 break;
1129
1130 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1131 handle_subscribe_ack(monc, msg);
1132 break;
1133
1134 case CEPH_MSG_STATFS_REPLY:
1135 handle_statfs_reply(monc, msg);
1136 break;
1137
1138 case CEPH_MSG_MON_GET_VERSION_REPLY:
1139 handle_get_version_reply(monc, msg);
1140 break;
1141
1142 case CEPH_MSG_MON_MAP:
1143 ceph_monc_handle_map(monc, msg);
1144 break;
1145
1146 case CEPH_MSG_OSD_MAP:
1147 ceph_osdc_handle_map(&monc->client->osdc, msg);
1148 break;
1149
1150 default:
1151 /* can the chained handler handle it? */
1152 if (monc->client->extra_mon_dispatch &&
1153 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1154 break;
1155
1156 pr_err("received unknown message type %d %s\n", type,
1157 ceph_msg_type_name(type));
1158 }
1159 ceph_msg_put(msg);
1160 }
1161
1162 /*
1163 * Allocate memory for incoming message
1164 */
1165 static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1166 struct ceph_msg_header *hdr,
1167 int *skip)
1168 {
1169 struct ceph_mon_client *monc = con->private;
1170 int type = le16_to_cpu(hdr->type);
1171 int front_len = le32_to_cpu(hdr->front_len);
1172 struct ceph_msg *m = NULL;
1173
1174 *skip = 0;
1175
1176 switch (type) {
1177 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1178 m = ceph_msg_get(monc->m_subscribe_ack);
1179 break;
1180 case CEPH_MSG_STATFS_REPLY:
1181 return get_generic_reply(con, hdr, skip);
1182 case CEPH_MSG_AUTH_REPLY:
1183 m = ceph_msg_get(monc->m_auth_reply);
1184 break;
1185 case CEPH_MSG_MON_GET_VERSION_REPLY:
1186 if (le64_to_cpu(hdr->tid) != 0)
1187 return get_generic_reply(con, hdr, skip);
1188
1189 /*
1190 * Older OSDs don't set reply tid even if the orignal
1191 * request had a non-zero tid. Workaround this weirdness
1192 * by falling through to the allocate case.
1193 */
1194 case CEPH_MSG_MON_MAP:
1195 case CEPH_MSG_MDS_MAP:
1196 case CEPH_MSG_OSD_MAP:
1197 case CEPH_MSG_FS_MAP_USER:
1198 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1199 if (!m)
1200 return NULL; /* ENOMEM--return skip == 0 */
1201 break;
1202 }
1203
1204 if (!m) {
1205 pr_info("alloc_msg unknown type %d\n", type);
1206 *skip = 1;
1207 } else if (front_len > m->front_alloc_len) {
1208 pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
1209 front_len, m->front_alloc_len,
1210 (unsigned int)con->peer_name.type,
1211 le64_to_cpu(con->peer_name.num));
1212 ceph_msg_put(m);
1213 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1214 }
1215
1216 return m;
1217 }
1218
1219 /*
1220 * If the monitor connection resets, pick a new monitor and resubmit
1221 * any pending requests.
1222 */
1223 static void mon_fault(struct ceph_connection *con)
1224 {
1225 struct ceph_mon_client *monc = con->private;
1226
1227 mutex_lock(&monc->mutex);
1228 dout("%s mon%d\n", __func__, monc->cur_mon);
1229 if (monc->cur_mon >= 0) {
1230 if (!monc->hunting) {
1231 dout("%s hunting for new mon\n", __func__);
1232 reopen_session(monc);
1233 __schedule_delayed(monc);
1234 } else {
1235 dout("%s already hunting\n", __func__);
1236 }
1237 }
1238 mutex_unlock(&monc->mutex);
1239 }
1240
1241 /*
1242 * We can ignore refcounting on the connection struct, as all references
1243 * will come from the messenger workqueue, which is drained prior to
1244 * mon_client destruction.
1245 */
1246 static struct ceph_connection *con_get(struct ceph_connection *con)
1247 {
1248 return con;
1249 }
1250
1251 static void con_put(struct ceph_connection *con)
1252 {
1253 }
1254
1255 static const struct ceph_connection_operations mon_con_ops = {
1256 .get = con_get,
1257 .put = con_put,
1258 .dispatch = dispatch,
1259 .fault = mon_fault,
1260 .alloc_msg = mon_alloc_msg,
1261 };
Linux kernel - Deliverables
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