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tracing: Introduce TRACE_EVENT_FN_COND macro
[linux/fpc-iii.git] / net / ceph / mon_client.c
blobedda01626a459efbfdaeebd46fd6a0b13a037879
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 monc->cur_mon = -1;
126 monc->pending_auth = 0;
127 ceph_auth_reset(monc->auth);
128 }
129
130 /*
131 * Open a session with a (new) monitor.
132 */
133 static int __open_session(struct ceph_mon_client *monc)
134 {
135 char r;
136 int ret;
137
138 if (monc->cur_mon < 0) {
139 get_random_bytes(&r, 1);
140 monc->cur_mon = r % monc->monmap->num_mon;
141 dout("open_session num=%d r=%d -> mon%d\n",
142 monc->monmap->num_mon, r, monc->cur_mon);
143 monc->sub_sent = 0;
144 monc->sub_renew_after = jiffies; /* i.e., expired */
145 monc->want_next_osdmap = !!monc->want_next_osdmap;
146
147 dout("open_session mon%d opening\n", monc->cur_mon);
148 ceph_con_open(&monc->con,
149 CEPH_ENTITY_TYPE_MON, monc->cur_mon,
150 &monc->monmap->mon_inst[monc->cur_mon].addr);
151
152 /* send an initial keepalive to ensure our timestamp is
153 * valid by the time we are in an OPENED state */
154 ceph_con_keepalive(&monc->con);
155
156 /* initiatiate authentication handshake */
157 ret = ceph_auth_build_hello(monc->auth,
158 monc->m_auth->front.iov_base,
159 monc->m_auth->front_alloc_len);
160 __send_prepared_auth_request(monc, ret);
161 } else {
162 dout("open_session mon%d already open\n", monc->cur_mon);
163 }
164 return 0;
165 }
166
167 static bool __sub_expired(struct ceph_mon_client *monc)
168 {
169 return time_after_eq(jiffies, monc->sub_renew_after);
170 }
171
172 /*
173 * Reschedule delayed work timer.
174 */
175 static void __schedule_delayed(struct ceph_mon_client *monc)
176 {
177 struct ceph_options *opt = monc->client->options;
178 unsigned long delay;
179
180 if (monc->cur_mon < 0 || __sub_expired(monc)) {
181 delay = 10 * HZ;
182 } else {
183 delay = 20 * HZ;
184 if (opt->monc_ping_timeout > 0)
185 delay = min(delay, opt->monc_ping_timeout / 3);
186 }
187 dout("__schedule_delayed after %lu\n", delay);
188 schedule_delayed_work(&monc->delayed_work,
189 round_jiffies_relative(delay));
190 }
191
192 /*
193 * Send subscribe request for mdsmap and/or osdmap.
194 */
195 static void __send_subscribe(struct ceph_mon_client *monc)
196 {
197 dout("__send_subscribe sub_sent=%u exp=%u want_osd=%d\n",
198 (unsigned int)monc->sub_sent, __sub_expired(monc),
199 monc->want_next_osdmap);
200 if ((__sub_expired(monc) && !monc->sub_sent) ||
201 monc->want_next_osdmap == 1) {
202 struct ceph_msg *msg = monc->m_subscribe;
203 struct ceph_mon_subscribe_item *i;
204 void *p, *end;
205 int num;
206
207 p = msg->front.iov_base;
208 end = p + msg->front_alloc_len;
209
210 num = 1 + !!monc->want_next_osdmap + !!monc->want_mdsmap;
211 ceph_encode_32(&p, num);
212
213 if (monc->want_next_osdmap) {
214 dout("__send_subscribe to 'osdmap' %u\n",
215 (unsigned int)monc->have_osdmap);
216 ceph_encode_string(&p, end, "osdmap", 6);
217 i = p;
218 i->have = cpu_to_le64(monc->have_osdmap);
219 i->onetime = 1;
220 p += sizeof(*i);
221 monc->want_next_osdmap = 2; /* requested */
222 }
223 if (monc->want_mdsmap) {
224 dout("__send_subscribe to 'mdsmap' %u+\n",
225 (unsigned int)monc->have_mdsmap);
226 ceph_encode_string(&p, end, "mdsmap", 6);
227 i = p;
228 i->have = cpu_to_le64(monc->have_mdsmap);
229 i->onetime = 0;
230 p += sizeof(*i);
231 }
232 ceph_encode_string(&p, end, "monmap", 6);
233 i = p;
234 i->have = 0;
235 i->onetime = 0;
236 p += sizeof(*i);
237
238 msg->front.iov_len = p - msg->front.iov_base;
239 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
240 ceph_msg_revoke(msg);
241 ceph_con_send(&monc->con, ceph_msg_get(msg));
242
243 monc->sub_sent = jiffies | 1; /* never 0 */
244 }
245 }
246
247 static void handle_subscribe_ack(struct ceph_mon_client *monc,
248 struct ceph_msg *msg)
249 {
250 unsigned int seconds;
251 struct ceph_mon_subscribe_ack *h = msg->front.iov_base;
252
253 if (msg->front.iov_len < sizeof(*h))
254 goto bad;
255 seconds = le32_to_cpu(h->duration);
256
257 mutex_lock(&monc->mutex);
258 if (monc->hunting) {
259 pr_info("mon%d %s session established\n",
260 monc->cur_mon,
261 ceph_pr_addr(&monc->con.peer_addr.in_addr));
262 monc->hunting = false;
263 }
264 dout("handle_subscribe_ack after %d seconds\n", seconds);
265 monc->sub_renew_after = monc->sub_sent + (seconds >> 1)*HZ - 1;
266 monc->sub_sent = 0;
267 mutex_unlock(&monc->mutex);
268 return;
269 bad:
270 pr_err("got corrupt subscribe-ack msg\n");
271 ceph_msg_dump(msg);
272 }
273
274 /*
275 * Keep track of which maps we have
276 */
277 int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 got)
278 {
279 mutex_lock(&monc->mutex);
280 monc->have_mdsmap = got;
281 mutex_unlock(&monc->mutex);
282 return 0;
283 }
284 EXPORT_SYMBOL(ceph_monc_got_mdsmap);
285
286 int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 got)
287 {
288 mutex_lock(&monc->mutex);
289 monc->have_osdmap = got;
290 monc->want_next_osdmap = 0;
291 mutex_unlock(&monc->mutex);
292 return 0;
293 }
294
295 /*
296 * Register interest in the next osdmap
297 */
298 void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc)
299 {
300 dout("request_next_osdmap have %u\n", monc->have_osdmap);
301 mutex_lock(&monc->mutex);
302 if (!monc->want_next_osdmap)
303 monc->want_next_osdmap = 1;
304 if (monc->want_next_osdmap < 2)
305 __send_subscribe(monc);
306 mutex_unlock(&monc->mutex);
307 }
308 EXPORT_SYMBOL(ceph_monc_request_next_osdmap);
309
310 /*
311 * Wait for an osdmap with a given epoch.
312 *
313 * @epoch: epoch to wait for
314 * @timeout: in jiffies, 0 means "wait forever"
315 */
316 int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
317 unsigned long timeout)
318 {
319 unsigned long started = jiffies;
320 long ret;
321
322 mutex_lock(&monc->mutex);
323 while (monc->have_osdmap < epoch) {
324 mutex_unlock(&monc->mutex);
325
326 if (timeout && time_after_eq(jiffies, started + timeout))
327 return -ETIMEDOUT;
328
329 ret = wait_event_interruptible_timeout(monc->client->auth_wq,
330 monc->have_osdmap >= epoch,
331 ceph_timeout_jiffies(timeout));
332 if (ret < 0)
333 return ret;
334
335 mutex_lock(&monc->mutex);
336 }
337
338 mutex_unlock(&monc->mutex);
339 return 0;
340 }
341 EXPORT_SYMBOL(ceph_monc_wait_osdmap);
342
343 /*
344 *
345 */
346 int ceph_monc_open_session(struct ceph_mon_client *monc)
347 {
348 mutex_lock(&monc->mutex);
349 __open_session(monc);
350 __schedule_delayed(monc);
351 mutex_unlock(&monc->mutex);
352 return 0;
353 }
354 EXPORT_SYMBOL(ceph_monc_open_session);
355
356 /*
357 * We require the fsid and global_id in order to initialize our
358 * debugfs dir.
359 */
360 static bool have_debugfs_info(struct ceph_mon_client *monc)
361 {
362 dout("have_debugfs_info fsid %d globalid %lld\n",
363 (int)monc->client->have_fsid, monc->auth->global_id);
364 return monc->client->have_fsid && monc->auth->global_id > 0;
365 }
366
367 /*
368 * The monitor responds with mount ack indicate mount success. The
369 * included client ticket allows the client to talk to MDSs and OSDs.
370 */
371 static void ceph_monc_handle_map(struct ceph_mon_client *monc,
372 struct ceph_msg *msg)
373 {
374 struct ceph_client *client = monc->client;
375 struct ceph_monmap *monmap = NULL, *old = monc->monmap;
376 void *p, *end;
377 int had_debugfs_info, init_debugfs = 0;
378
379 mutex_lock(&monc->mutex);
380
381 had_debugfs_info = have_debugfs_info(monc);
382
383 dout("handle_monmap\n");
384 p = msg->front.iov_base;
385 end = p + msg->front.iov_len;
386
387 monmap = ceph_monmap_decode(p, end);
388 if (IS_ERR(monmap)) {
389 pr_err("problem decoding monmap, %d\n",
390 (int)PTR_ERR(monmap));
391 goto out;
392 }
393
394 if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) {
395 kfree(monmap);
396 goto out;
397 }
398
399 client->monc.monmap = monmap;
400 kfree(old);
401
402 if (!client->have_fsid) {
403 client->have_fsid = true;
404 if (!had_debugfs_info && have_debugfs_info(monc)) {
405 pr_info("client%lld fsid %pU\n",
406 ceph_client_id(monc->client),
407 &monc->client->fsid);
408 init_debugfs = 1;
409 }
410 mutex_unlock(&monc->mutex);
411
412 if (init_debugfs) {
413 /*
414 * do debugfs initialization without mutex to avoid
415 * creating a locking dependency
416 */
417 ceph_debugfs_client_init(monc->client);
418 }
419
420 goto out_unlocked;
421 }
422 out:
423 mutex_unlock(&monc->mutex);
424 out_unlocked:
425 wake_up_all(&client->auth_wq);
426 }
427
428 /*
429 * generic requests (currently statfs, mon_get_version)
430 */
431 static struct ceph_mon_generic_request *__lookup_generic_req(
432 struct ceph_mon_client *monc, u64 tid)
433 {
434 struct ceph_mon_generic_request *req;
435 struct rb_node *n = monc->generic_request_tree.rb_node;
436
437 while (n) {
438 req = rb_entry(n, struct ceph_mon_generic_request, node);
439 if (tid < req->tid)
440 n = n->rb_left;
441 else if (tid > req->tid)
442 n = n->rb_right;
443 else
444 return req;
445 }
446 return NULL;
447 }
448
449 static void __insert_generic_request(struct ceph_mon_client *monc,
450 struct ceph_mon_generic_request *new)
451 {
452 struct rb_node **p = &monc->generic_request_tree.rb_node;
453 struct rb_node *parent = NULL;
454 struct ceph_mon_generic_request *req = NULL;
455
456 while (*p) {
457 parent = *p;
458 req = rb_entry(parent, struct ceph_mon_generic_request, node);
459 if (new->tid < req->tid)
460 p = &(*p)->rb_left;
461 else if (new->tid > req->tid)
462 p = &(*p)->rb_right;
463 else
464 BUG();
465 }
466
467 rb_link_node(&new->node, parent, p);
468 rb_insert_color(&new->node, &monc->generic_request_tree);
469 }
470
471 static void release_generic_request(struct kref *kref)
472 {
473 struct ceph_mon_generic_request *req =
474 container_of(kref, struct ceph_mon_generic_request, kref);
475
476 if (req->reply)
477 ceph_msg_put(req->reply);
478 if (req->request)
479 ceph_msg_put(req->request);
480
481 kfree(req);
482 }
483
484 static void put_generic_request(struct ceph_mon_generic_request *req)
485 {
486 kref_put(&req->kref, release_generic_request);
487 }
488
489 static void get_generic_request(struct ceph_mon_generic_request *req)
490 {
491 kref_get(&req->kref);
492 }
493
494 static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
495 struct ceph_msg_header *hdr,
496 int *skip)
497 {
498 struct ceph_mon_client *monc = con->private;
499 struct ceph_mon_generic_request *req;
500 u64 tid = le64_to_cpu(hdr->tid);
501 struct ceph_msg *m;
502
503 mutex_lock(&monc->mutex);
504 req = __lookup_generic_req(monc, tid);
505 if (!req) {
506 dout("get_generic_reply %lld dne\n", tid);
507 *skip = 1;
508 m = NULL;
509 } else {
510 dout("get_generic_reply %lld got %p\n", tid, req->reply);
511 *skip = 0;
512 m = ceph_msg_get(req->reply);
513 /*
514 * we don't need to track the connection reading into
515 * this reply because we only have one open connection
516 * at a time, ever.
517 */
518 }
519 mutex_unlock(&monc->mutex);
520 return m;
521 }
522
523 static int __do_generic_request(struct ceph_mon_client *monc, u64 tid,
524 struct ceph_mon_generic_request *req)
525 {
526 int err;
527
528 /* register request */
529 req->tid = tid != 0 ? tid : ++monc->last_tid;
530 req->request->hdr.tid = cpu_to_le64(req->tid);
531 __insert_generic_request(monc, req);
532 monc->num_generic_requests++;
533 ceph_con_send(&monc->con, ceph_msg_get(req->request));
534 mutex_unlock(&monc->mutex);
535
536 err = wait_for_completion_interruptible(&req->completion);
537
538 mutex_lock(&monc->mutex);
539 rb_erase(&req->node, &monc->generic_request_tree);
540 monc->num_generic_requests--;
541
542 if (!err)
543 err = req->result;
544 return err;
545 }
546
547 static int do_generic_request(struct ceph_mon_client *monc,
548 struct ceph_mon_generic_request *req)
549 {
550 int err;
551
552 mutex_lock(&monc->mutex);
553 err = __do_generic_request(monc, 0, req);
554 mutex_unlock(&monc->mutex);
555
556 return err;
557 }
558
559 /*
560 * statfs
561 */
562 static void handle_statfs_reply(struct ceph_mon_client *monc,
563 struct ceph_msg *msg)
564 {
565 struct ceph_mon_generic_request *req;
566 struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
567 u64 tid = le64_to_cpu(msg->hdr.tid);
568
569 if (msg->front.iov_len != sizeof(*reply))
570 goto bad;
571 dout("handle_statfs_reply %p tid %llu\n", msg, tid);
572
573 mutex_lock(&monc->mutex);
574 req = __lookup_generic_req(monc, tid);
575 if (req) {
576 *(struct ceph_statfs *)req->buf = reply->st;
577 req->result = 0;
578 get_generic_request(req);
579 }
580 mutex_unlock(&monc->mutex);
581 if (req) {
582 complete_all(&req->completion);
583 put_generic_request(req);
584 }
585 return;
586
587 bad:
588 pr_err("corrupt statfs reply, tid %llu\n", tid);
589 ceph_msg_dump(msg);
590 }
591
592 /*
593 * Do a synchronous statfs().
594 */
595 int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf)
596 {
597 struct ceph_mon_generic_request *req;
598 struct ceph_mon_statfs *h;
599 int err;
600
601 req = kzalloc(sizeof(*req), GFP_NOFS);
602 if (!req)
603 return -ENOMEM;
604
605 kref_init(&req->kref);
606 req->buf = buf;
607 init_completion(&req->completion);
608
609 err = -ENOMEM;
610 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS,
611 true);
612 if (!req->request)
613 goto out;
614 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 1024, GFP_NOFS,
615 true);
616 if (!req->reply)
617 goto out;
618
619 /* fill out request */
620 h = req->request->front.iov_base;
621 h->monhdr.have_version = 0;
622 h->monhdr.session_mon = cpu_to_le16(-1);
623 h->monhdr.session_mon_tid = 0;
624 h->fsid = monc->monmap->fsid;
625
626 err = do_generic_request(monc, req);
627
628 out:
629 put_generic_request(req);
630 return err;
631 }
632 EXPORT_SYMBOL(ceph_monc_do_statfs);
633
634 static void handle_get_version_reply(struct ceph_mon_client *monc,
635 struct ceph_msg *msg)
636 {
637 struct ceph_mon_generic_request *req;
638 u64 tid = le64_to_cpu(msg->hdr.tid);
639 void *p = msg->front.iov_base;
640 void *end = p + msg->front_alloc_len;
641 u64 handle;
642
643 dout("%s %p tid %llu\n", __func__, msg, tid);
644
645 ceph_decode_need(&p, end, 2*sizeof(u64), bad);
646 handle = ceph_decode_64(&p);
647 if (tid != 0 && tid != handle)
648 goto bad;
649
650 mutex_lock(&monc->mutex);
651 req = __lookup_generic_req(monc, handle);
652 if (req) {
653 *(u64 *)req->buf = ceph_decode_64(&p);
654 req->result = 0;
655 get_generic_request(req);
656 }
657 mutex_unlock(&monc->mutex);
658 if (req) {
659 complete_all(&req->completion);
660 put_generic_request(req);
661 }
662
663 return;
664 bad:
665 pr_err("corrupt mon_get_version reply, tid %llu\n", tid);
666 ceph_msg_dump(msg);
667 }
668
669 /*
670 * Send MMonGetVersion and wait for the reply.
671 *
672 * @what: one of "mdsmap", "osdmap" or "monmap"
673 */
674 int ceph_monc_do_get_version(struct ceph_mon_client *monc, const char *what,
675 u64 *newest)
676 {
677 struct ceph_mon_generic_request *req;
678 void *p, *end;
679 u64 tid;
680 int err;
681
682 req = kzalloc(sizeof(*req), GFP_NOFS);
683 if (!req)
684 return -ENOMEM;
685
686 kref_init(&req->kref);
687 req->buf = newest;
688 init_completion(&req->completion);
689
690 req->request = ceph_msg_new(CEPH_MSG_MON_GET_VERSION,
691 sizeof(u64) + sizeof(u32) + strlen(what),
692 GFP_NOFS, true);
693 if (!req->request) {
694 err = -ENOMEM;
695 goto out;
696 }
697
698 req->reply = ceph_msg_new(CEPH_MSG_MON_GET_VERSION_REPLY, 1024,
699 GFP_NOFS, true);
700 if (!req->reply) {
701 err = -ENOMEM;
702 goto out;
703 }
704
705 p = req->request->front.iov_base;
706 end = p + req->request->front_alloc_len;
707
708 /* fill out request */
709 mutex_lock(&monc->mutex);
710 tid = ++monc->last_tid;
711 ceph_encode_64(&p, tid); /* handle */
712 ceph_encode_string(&p, end, what, strlen(what));
713
714 err = __do_generic_request(monc, tid, req);
715
716 mutex_unlock(&monc->mutex);
717 out:
718 put_generic_request(req);
719 return err;
720 }
721 EXPORT_SYMBOL(ceph_monc_do_get_version);
722
723 /*
724 * Resend pending generic requests.
725 */
726 static void __resend_generic_request(struct ceph_mon_client *monc)
727 {
728 struct ceph_mon_generic_request *req;
729 struct rb_node *p;
730
731 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
732 req = rb_entry(p, struct ceph_mon_generic_request, node);
733 ceph_msg_revoke(req->request);
734 ceph_msg_revoke_incoming(req->reply);
735 ceph_con_send(&monc->con, ceph_msg_get(req->request));
736 }
737 }
738
739 /*
740 * Delayed work. If we haven't mounted yet, retry. Otherwise,
741 * renew/retry subscription as needed (in case it is timing out, or we
742 * got an ENOMEM). And keep the monitor connection alive.
743 */
744 static void delayed_work(struct work_struct *work)
745 {
746 struct ceph_mon_client *monc =
747 container_of(work, struct ceph_mon_client, delayed_work.work);
748
749 dout("monc delayed_work\n");
750 mutex_lock(&monc->mutex);
751 if (monc->hunting) {
752 __close_session(monc);
753 __open_session(monc); /* continue hunting */
754 } else {
755 struct ceph_options *opt = monc->client->options;
756 int is_auth = ceph_auth_is_authenticated(monc->auth);
757 if (ceph_con_keepalive_expired(&monc->con,
758 opt->monc_ping_timeout)) {
759 dout("monc keepalive timeout\n");
760 is_auth = 0;
761 __close_session(monc);
762 monc->hunting = true;
763 __open_session(monc);
764 }
765
766 if (!monc->hunting) {
767 ceph_con_keepalive(&monc->con);
768 __validate_auth(monc);
769 }
770
771 if (is_auth)
772 __send_subscribe(monc);
773 }
774 __schedule_delayed(monc);
775 mutex_unlock(&monc->mutex);
776 }
777
778 /*
779 * On startup, we build a temporary monmap populated with the IPs
780 * provided by mount(2).
781 */
782 static int build_initial_monmap(struct ceph_mon_client *monc)
783 {
784 struct ceph_options *opt = monc->client->options;
785 struct ceph_entity_addr *mon_addr = opt->mon_addr;
786 int num_mon = opt->num_mon;
787 int i;
788
789 /* build initial monmap */
790 monc->monmap = kzalloc(sizeof(*monc->monmap) +
791 num_mon*sizeof(monc->monmap->mon_inst[0]),
792 GFP_KERNEL);
793 if (!monc->monmap)
794 return -ENOMEM;
795 for (i = 0; i < num_mon; i++) {
796 monc->monmap->mon_inst[i].addr = mon_addr[i];
797 monc->monmap->mon_inst[i].addr.nonce = 0;
798 monc->monmap->mon_inst[i].name.type =
799 CEPH_ENTITY_TYPE_MON;
800 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
801 }
802 monc->monmap->num_mon = num_mon;
803 return 0;
804 }
805
806 int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
807 {
808 int err = 0;
809
810 dout("init\n");
811 memset(monc, 0, sizeof(*monc));
812 monc->client = cl;
813 monc->monmap = NULL;
814 mutex_init(&monc->mutex);
815
816 err = build_initial_monmap(monc);
817 if (err)
818 goto out;
819
820 /* connection */
821 /* authentication */
822 monc->auth = ceph_auth_init(cl->options->name,
823 cl->options->key);
824 if (IS_ERR(monc->auth)) {
825 err = PTR_ERR(monc->auth);
826 goto out_monmap;
827 }
828 monc->auth->want_keys =
829 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
830 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
831
832 /* msgs */
833 err = -ENOMEM;
834 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
835 sizeof(struct ceph_mon_subscribe_ack),
836 GFP_NOFS, true);
837 if (!monc->m_subscribe_ack)
838 goto out_auth;
839
840 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS,
841 true);
842 if (!monc->m_subscribe)
843 goto out_subscribe_ack;
844
845 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS,
846 true);
847 if (!monc->m_auth_reply)
848 goto out_subscribe;
849
850 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS, true);
851 monc->pending_auth = 0;
852 if (!monc->m_auth)
853 goto out_auth_reply;
854
855 ceph_con_init(&monc->con, monc, &mon_con_ops,
856 &monc->client->msgr);
857
858 monc->cur_mon = -1;
859 monc->hunting = true;
860 monc->sub_renew_after = jiffies;
861 monc->sub_sent = 0;
862
863 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
864 monc->generic_request_tree = RB_ROOT;
865 monc->num_generic_requests = 0;
866 monc->last_tid = 0;
867
868 monc->have_mdsmap = 0;
869 monc->have_osdmap = 0;
870 monc->want_next_osdmap = 1;
871 return 0;
872
873 out_auth_reply:
874 ceph_msg_put(monc->m_auth_reply);
875 out_subscribe:
876 ceph_msg_put(monc->m_subscribe);
877 out_subscribe_ack:
878 ceph_msg_put(monc->m_subscribe_ack);
879 out_auth:
880 ceph_auth_destroy(monc->auth);
881 out_monmap:
882 kfree(monc->monmap);
883 out:
884 return err;
885 }
886 EXPORT_SYMBOL(ceph_monc_init);
887
888 void ceph_monc_stop(struct ceph_mon_client *monc)
889 {
890 dout("stop\n");
891 cancel_delayed_work_sync(&monc->delayed_work);
892
893 mutex_lock(&monc->mutex);
894 __close_session(monc);
895
896 mutex_unlock(&monc->mutex);
897
898 /*
899 * flush msgr queue before we destroy ourselves to ensure that:
900 * - any work that references our embedded con is finished.
901 * - any osd_client or other work that may reference an authorizer
902 * finishes before we shut down the auth subsystem.
903 */
904 ceph_msgr_flush();
905
906 ceph_auth_destroy(monc->auth);
907
908 ceph_msg_put(monc->m_auth);
909 ceph_msg_put(monc->m_auth_reply);
910 ceph_msg_put(monc->m_subscribe);
911 ceph_msg_put(monc->m_subscribe_ack);
912
913 kfree(monc->monmap);
914 }
915 EXPORT_SYMBOL(ceph_monc_stop);
916
917 static void handle_auth_reply(struct ceph_mon_client *monc,
918 struct ceph_msg *msg)
919 {
920 int ret;
921 int was_auth = 0;
922 int had_debugfs_info, init_debugfs = 0;
923
924 mutex_lock(&monc->mutex);
925 had_debugfs_info = have_debugfs_info(monc);
926 was_auth = ceph_auth_is_authenticated(monc->auth);
927 monc->pending_auth = 0;
928 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
929 msg->front.iov_len,
930 monc->m_auth->front.iov_base,
931 monc->m_auth->front_alloc_len);
932 if (ret < 0) {
933 monc->client->auth_err = ret;
934 wake_up_all(&monc->client->auth_wq);
935 } else if (ret > 0) {
936 __send_prepared_auth_request(monc, ret);
937 } else if (!was_auth && ceph_auth_is_authenticated(monc->auth)) {
938 dout("authenticated, starting session\n");
939
940 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
941 monc->client->msgr.inst.name.num =
942 cpu_to_le64(monc->auth->global_id);
943
944 __send_subscribe(monc);
945 __resend_generic_request(monc);
946 }
947
948 if (!had_debugfs_info && have_debugfs_info(monc)) {
949 pr_info("client%lld fsid %pU\n",
950 ceph_client_id(monc->client),
951 &monc->client->fsid);
952 init_debugfs = 1;
953 }
954 mutex_unlock(&monc->mutex);
955
956 if (init_debugfs) {
957 /*
958 * do debugfs initialization without mutex to avoid
959 * creating a locking dependency
960 */
961 ceph_debugfs_client_init(monc->client);
962 }
963 }
964
965 static int __validate_auth(struct ceph_mon_client *monc)
966 {
967 int ret;
968
969 if (monc->pending_auth)
970 return 0;
971
972 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
973 monc->m_auth->front_alloc_len);
974 if (ret <= 0)
975 return ret; /* either an error, or no need to authenticate */
976 __send_prepared_auth_request(monc, ret);
977 return 0;
978 }
979
980 int ceph_monc_validate_auth(struct ceph_mon_client *monc)
981 {
982 int ret;
983
984 mutex_lock(&monc->mutex);
985 ret = __validate_auth(monc);
986 mutex_unlock(&monc->mutex);
987 return ret;
988 }
989 EXPORT_SYMBOL(ceph_monc_validate_auth);
990
991 /*
992 * handle incoming message
993 */
994 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
995 {
996 struct ceph_mon_client *monc = con->private;
997 int type = le16_to_cpu(msg->hdr.type);
998
999 if (!monc)
1000 return;
1001
1002 switch (type) {
1003 case CEPH_MSG_AUTH_REPLY:
1004 handle_auth_reply(monc, msg);
1005 break;
1006
1007 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1008 handle_subscribe_ack(monc, msg);
1009 break;
1010
1011 case CEPH_MSG_STATFS_REPLY:
1012 handle_statfs_reply(monc, msg);
1013 break;
1014
1015 case CEPH_MSG_MON_GET_VERSION_REPLY:
1016 handle_get_version_reply(monc, msg);
1017 break;
1018
1019 case CEPH_MSG_MON_MAP:
1020 ceph_monc_handle_map(monc, msg);
1021 break;
1022
1023 case CEPH_MSG_OSD_MAP:
1024 ceph_osdc_handle_map(&monc->client->osdc, msg);
1025 break;
1026
1027 default:
1028 /* can the chained handler handle it? */
1029 if (monc->client->extra_mon_dispatch &&
1030 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1031 break;
1032
1033 pr_err("received unknown message type %d %s\n", type,
1034 ceph_msg_type_name(type));
1035 }
1036 ceph_msg_put(msg);
1037 }
1038
1039 /*
1040 * Allocate memory for incoming message
1041 */
1042 static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1043 struct ceph_msg_header *hdr,
1044 int *skip)
1045 {
1046 struct ceph_mon_client *monc = con->private;
1047 int type = le16_to_cpu(hdr->type);
1048 int front_len = le32_to_cpu(hdr->front_len);
1049 struct ceph_msg *m = NULL;
1050
1051 *skip = 0;
1052
1053 switch (type) {
1054 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1055 m = ceph_msg_get(monc->m_subscribe_ack);
1056 break;
1057 case CEPH_MSG_STATFS_REPLY:
1058 return get_generic_reply(con, hdr, skip);
1059 case CEPH_MSG_AUTH_REPLY:
1060 m = ceph_msg_get(monc->m_auth_reply);
1061 break;
1062 case CEPH_MSG_MON_GET_VERSION_REPLY:
1063 if (le64_to_cpu(hdr->tid) != 0)
1064 return get_generic_reply(con, hdr, skip);
1065
1066 /*
1067 * Older OSDs don't set reply tid even if the orignal
1068 * request had a non-zero tid. Workaround this weirdness
1069 * by falling through to the allocate case.
1070 */
1071 case CEPH_MSG_MON_MAP:
1072 case CEPH_MSG_MDS_MAP:
1073 case CEPH_MSG_OSD_MAP:
1074 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1075 if (!m)
1076 return NULL; /* ENOMEM--return skip == 0 */
1077 break;
1078 }
1079
1080 if (!m) {
1081 pr_info("alloc_msg unknown type %d\n", type);
1082 *skip = 1;
1083 } else if (front_len > m->front_alloc_len) {
1084 pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
1085 front_len, m->front_alloc_len,
1086 (unsigned int)con->peer_name.type,
1087 le64_to_cpu(con->peer_name.num));
1088 ceph_msg_put(m);
1089 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1090 }
1091
1092 return m;
1093 }
1094
1095 /*
1096 * If the monitor connection resets, pick a new monitor and resubmit
1097 * any pending requests.
1098 */
1099 static void mon_fault(struct ceph_connection *con)
1100 {
1101 struct ceph_mon_client *monc = con->private;
1102
1103 if (!monc)
1104 return;
1105
1106 dout("mon_fault\n");
1107 mutex_lock(&monc->mutex);
1108 if (!con->private)
1109 goto out;
1110
1111 if (!monc->hunting)
1112 pr_info("mon%d %s session lost, "
1113 "hunting for new mon\n", monc->cur_mon,
1114 ceph_pr_addr(&monc->con.peer_addr.in_addr));
1115
1116 __close_session(monc);
1117 if (!monc->hunting) {
1118 /* start hunting */
1119 monc->hunting = true;
1120 __open_session(monc);
1121 } else {
1122 /* already hunting, let's wait a bit */
1123 __schedule_delayed(monc);
1124 }
1125 out:
1126 mutex_unlock(&monc->mutex);
1127 }
1128
1129 /*
1130 * We can ignore refcounting on the connection struct, as all references
1131 * will come from the messenger workqueue, which is drained prior to
1132 * mon_client destruction.
1133 */
1134 static struct ceph_connection *con_get(struct ceph_connection *con)
1135 {
1136 return con;
1137 }
1138
1139 static void con_put(struct ceph_connection *con)
1140 {
1141 }
1142
1143 static const struct ceph_connection_operations mon_con_ops = {
1144 .get = con_get,
1145 .put = con_put,
1146 .dispatch = dispatch,
1147 .fault = mon_fault,
1148 .alloc_msg = mon_alloc_msg,
1149 };
Linux with added FPC-III support