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Merge tag 'trace-fix-filter-4.1-rc8' of git://git.kernel.org/pub/scm/linux/kernel...
[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 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 /* initiatiate authentication handshake */
153 ret = ceph_auth_build_hello(monc->auth,
154 monc->m_auth->front.iov_base,
155 monc->m_auth->front_alloc_len);
156 __send_prepared_auth_request(monc, ret);
157 } else {
158 dout("open_session mon%d already open\n", monc->cur_mon);
159 }
160 return 0;
161 }
162
163 static bool __sub_expired(struct ceph_mon_client *monc)
164 {
165 return time_after_eq(jiffies, monc->sub_renew_after);
166 }
167
168 /*
169 * Reschedule delayed work timer.
170 */
171 static void __schedule_delayed(struct ceph_mon_client *monc)
172 {
173 unsigned int delay;
174
175 if (monc->cur_mon < 0 || __sub_expired(monc))
176 delay = 10 * HZ;
177 else
178 delay = 20 * HZ;
179 dout("__schedule_delayed after %u\n", delay);
180 schedule_delayed_work(&monc->delayed_work, delay);
181 }
182
183 /*
184 * Send subscribe request for mdsmap and/or osdmap.
185 */
186 static void __send_subscribe(struct ceph_mon_client *monc)
187 {
188 dout("__send_subscribe sub_sent=%u exp=%u want_osd=%d\n",
189 (unsigned int)monc->sub_sent, __sub_expired(monc),
190 monc->want_next_osdmap);
191 if ((__sub_expired(monc) && !monc->sub_sent) ||
192 monc->want_next_osdmap == 1) {
193 struct ceph_msg *msg = monc->m_subscribe;
194 struct ceph_mon_subscribe_item *i;
195 void *p, *end;
196 int num;
197
198 p = msg->front.iov_base;
199 end = p + msg->front_alloc_len;
200
201 num = 1 + !!monc->want_next_osdmap + !!monc->want_mdsmap;
202 ceph_encode_32(&p, num);
203
204 if (monc->want_next_osdmap) {
205 dout("__send_subscribe to 'osdmap' %u\n",
206 (unsigned int)monc->have_osdmap);
207 ceph_encode_string(&p, end, "osdmap", 6);
208 i = p;
209 i->have = cpu_to_le64(monc->have_osdmap);
210 i->onetime = 1;
211 p += sizeof(*i);
212 monc->want_next_osdmap = 2; /* requested */
213 }
214 if (monc->want_mdsmap) {
215 dout("__send_subscribe to 'mdsmap' %u+\n",
216 (unsigned int)monc->have_mdsmap);
217 ceph_encode_string(&p, end, "mdsmap", 6);
218 i = p;
219 i->have = cpu_to_le64(monc->have_mdsmap);
220 i->onetime = 0;
221 p += sizeof(*i);
222 }
223 ceph_encode_string(&p, end, "monmap", 6);
224 i = p;
225 i->have = 0;
226 i->onetime = 0;
227 p += sizeof(*i);
228
229 msg->front.iov_len = p - msg->front.iov_base;
230 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
231 ceph_msg_revoke(msg);
232 ceph_con_send(&monc->con, ceph_msg_get(msg));
233
234 monc->sub_sent = jiffies | 1; /* never 0 */
235 }
236 }
237
238 static void handle_subscribe_ack(struct ceph_mon_client *monc,
239 struct ceph_msg *msg)
240 {
241 unsigned int seconds;
242 struct ceph_mon_subscribe_ack *h = msg->front.iov_base;
243
244 if (msg->front.iov_len < sizeof(*h))
245 goto bad;
246 seconds = le32_to_cpu(h->duration);
247
248 mutex_lock(&monc->mutex);
249 if (monc->hunting) {
250 pr_info("mon%d %s session established\n",
251 monc->cur_mon,
252 ceph_pr_addr(&monc->con.peer_addr.in_addr));
253 monc->hunting = false;
254 }
255 dout("handle_subscribe_ack after %d seconds\n", seconds);
256 monc->sub_renew_after = monc->sub_sent + (seconds >> 1)*HZ - 1;
257 monc->sub_sent = 0;
258 mutex_unlock(&monc->mutex);
259 return;
260 bad:
261 pr_err("got corrupt subscribe-ack msg\n");
262 ceph_msg_dump(msg);
263 }
264
265 /*
266 * Keep track of which maps we have
267 */
268 int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 got)
269 {
270 mutex_lock(&monc->mutex);
271 monc->have_mdsmap = got;
272 mutex_unlock(&monc->mutex);
273 return 0;
274 }
275 EXPORT_SYMBOL(ceph_monc_got_mdsmap);
276
277 int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 got)
278 {
279 mutex_lock(&monc->mutex);
280 monc->have_osdmap = got;
281 monc->want_next_osdmap = 0;
282 mutex_unlock(&monc->mutex);
283 return 0;
284 }
285
286 /*
287 * Register interest in the next osdmap
288 */
289 void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc)
290 {
291 dout("request_next_osdmap have %u\n", monc->have_osdmap);
292 mutex_lock(&monc->mutex);
293 if (!monc->want_next_osdmap)
294 monc->want_next_osdmap = 1;
295 if (monc->want_next_osdmap < 2)
296 __send_subscribe(monc);
297 mutex_unlock(&monc->mutex);
298 }
299 EXPORT_SYMBOL(ceph_monc_request_next_osdmap);
300
301 int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
302 unsigned long timeout)
303 {
304 unsigned long started = jiffies;
305 int ret;
306
307 mutex_lock(&monc->mutex);
308 while (monc->have_osdmap < epoch) {
309 mutex_unlock(&monc->mutex);
310
311 if (timeout != 0 && time_after_eq(jiffies, started + timeout))
312 return -ETIMEDOUT;
313
314 ret = wait_event_interruptible_timeout(monc->client->auth_wq,
315 monc->have_osdmap >= epoch, timeout);
316 if (ret < 0)
317 return ret;
318
319 mutex_lock(&monc->mutex);
320 }
321
322 mutex_unlock(&monc->mutex);
323 return 0;
324 }
325 EXPORT_SYMBOL(ceph_monc_wait_osdmap);
326
327 /*
328 *
329 */
330 int ceph_monc_open_session(struct ceph_mon_client *monc)
331 {
332 mutex_lock(&monc->mutex);
333 __open_session(monc);
334 __schedule_delayed(monc);
335 mutex_unlock(&monc->mutex);
336 return 0;
337 }
338 EXPORT_SYMBOL(ceph_monc_open_session);
339
340 /*
341 * We require the fsid and global_id in order to initialize our
342 * debugfs dir.
343 */
344 static bool have_debugfs_info(struct ceph_mon_client *monc)
345 {
346 dout("have_debugfs_info fsid %d globalid %lld\n",
347 (int)monc->client->have_fsid, monc->auth->global_id);
348 return monc->client->have_fsid && monc->auth->global_id > 0;
349 }
350
351 /*
352 * The monitor responds with mount ack indicate mount success. The
353 * included client ticket allows the client to talk to MDSs and OSDs.
354 */
355 static void ceph_monc_handle_map(struct ceph_mon_client *monc,
356 struct ceph_msg *msg)
357 {
358 struct ceph_client *client = monc->client;
359 struct ceph_monmap *monmap = NULL, *old = monc->monmap;
360 void *p, *end;
361 int had_debugfs_info, init_debugfs = 0;
362
363 mutex_lock(&monc->mutex);
364
365 had_debugfs_info = have_debugfs_info(monc);
366
367 dout("handle_monmap\n");
368 p = msg->front.iov_base;
369 end = p + msg->front.iov_len;
370
371 monmap = ceph_monmap_decode(p, end);
372 if (IS_ERR(monmap)) {
373 pr_err("problem decoding monmap, %d\n",
374 (int)PTR_ERR(monmap));
375 goto out;
376 }
377
378 if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) {
379 kfree(monmap);
380 goto out;
381 }
382
383 client->monc.monmap = monmap;
384 kfree(old);
385
386 if (!client->have_fsid) {
387 client->have_fsid = true;
388 if (!had_debugfs_info && have_debugfs_info(monc)) {
389 pr_info("client%lld fsid %pU\n",
390 ceph_client_id(monc->client),
391 &monc->client->fsid);
392 init_debugfs = 1;
393 }
394 mutex_unlock(&monc->mutex);
395
396 if (init_debugfs) {
397 /*
398 * do debugfs initialization without mutex to avoid
399 * creating a locking dependency
400 */
401 ceph_debugfs_client_init(monc->client);
402 }
403
404 goto out_unlocked;
405 }
406 out:
407 mutex_unlock(&monc->mutex);
408 out_unlocked:
409 wake_up_all(&client->auth_wq);
410 }
411
412 /*
413 * generic requests (currently statfs, mon_get_version)
414 */
415 static struct ceph_mon_generic_request *__lookup_generic_req(
416 struct ceph_mon_client *monc, u64 tid)
417 {
418 struct ceph_mon_generic_request *req;
419 struct rb_node *n = monc->generic_request_tree.rb_node;
420
421 while (n) {
422 req = rb_entry(n, struct ceph_mon_generic_request, node);
423 if (tid < req->tid)
424 n = n->rb_left;
425 else if (tid > req->tid)
426 n = n->rb_right;
427 else
428 return req;
429 }
430 return NULL;
431 }
432
433 static void __insert_generic_request(struct ceph_mon_client *monc,
434 struct ceph_mon_generic_request *new)
435 {
436 struct rb_node **p = &monc->generic_request_tree.rb_node;
437 struct rb_node *parent = NULL;
438 struct ceph_mon_generic_request *req = NULL;
439
440 while (*p) {
441 parent = *p;
442 req = rb_entry(parent, struct ceph_mon_generic_request, node);
443 if (new->tid < req->tid)
444 p = &(*p)->rb_left;
445 else if (new->tid > req->tid)
446 p = &(*p)->rb_right;
447 else
448 BUG();
449 }
450
451 rb_link_node(&new->node, parent, p);
452 rb_insert_color(&new->node, &monc->generic_request_tree);
453 }
454
455 static void release_generic_request(struct kref *kref)
456 {
457 struct ceph_mon_generic_request *req =
458 container_of(kref, struct ceph_mon_generic_request, kref);
459
460 if (req->reply)
461 ceph_msg_put(req->reply);
462 if (req->request)
463 ceph_msg_put(req->request);
464
465 kfree(req);
466 }
467
468 static void put_generic_request(struct ceph_mon_generic_request *req)
469 {
470 kref_put(&req->kref, release_generic_request);
471 }
472
473 static void get_generic_request(struct ceph_mon_generic_request *req)
474 {
475 kref_get(&req->kref);
476 }
477
478 static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
479 struct ceph_msg_header *hdr,
480 int *skip)
481 {
482 struct ceph_mon_client *monc = con->private;
483 struct ceph_mon_generic_request *req;
484 u64 tid = le64_to_cpu(hdr->tid);
485 struct ceph_msg *m;
486
487 mutex_lock(&monc->mutex);
488 req = __lookup_generic_req(monc, tid);
489 if (!req) {
490 dout("get_generic_reply %lld dne\n", tid);
491 *skip = 1;
492 m = NULL;
493 } else {
494 dout("get_generic_reply %lld got %p\n", tid, req->reply);
495 *skip = 0;
496 m = ceph_msg_get(req->reply);
497 /*
498 * we don't need to track the connection reading into
499 * this reply because we only have one open connection
500 * at a time, ever.
501 */
502 }
503 mutex_unlock(&monc->mutex);
504 return m;
505 }
506
507 static int __do_generic_request(struct ceph_mon_client *monc, u64 tid,
508 struct ceph_mon_generic_request *req)
509 {
510 int err;
511
512 /* register request */
513 req->tid = tid != 0 ? tid : ++monc->last_tid;
514 req->request->hdr.tid = cpu_to_le64(req->tid);
515 __insert_generic_request(monc, req);
516 monc->num_generic_requests++;
517 ceph_con_send(&monc->con, ceph_msg_get(req->request));
518 mutex_unlock(&monc->mutex);
519
520 err = wait_for_completion_interruptible(&req->completion);
521
522 mutex_lock(&monc->mutex);
523 rb_erase(&req->node, &monc->generic_request_tree);
524 monc->num_generic_requests--;
525
526 if (!err)
527 err = req->result;
528 return err;
529 }
530
531 static int do_generic_request(struct ceph_mon_client *monc,
532 struct ceph_mon_generic_request *req)
533 {
534 int err;
535
536 mutex_lock(&monc->mutex);
537 err = __do_generic_request(monc, 0, req);
538 mutex_unlock(&monc->mutex);
539
540 return err;
541 }
542
543 /*
544 * statfs
545 */
546 static void handle_statfs_reply(struct ceph_mon_client *monc,
547 struct ceph_msg *msg)
548 {
549 struct ceph_mon_generic_request *req;
550 struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
551 u64 tid = le64_to_cpu(msg->hdr.tid);
552
553 if (msg->front.iov_len != sizeof(*reply))
554 goto bad;
555 dout("handle_statfs_reply %p tid %llu\n", msg, tid);
556
557 mutex_lock(&monc->mutex);
558 req = __lookup_generic_req(monc, tid);
559 if (req) {
560 *(struct ceph_statfs *)req->buf = reply->st;
561 req->result = 0;
562 get_generic_request(req);
563 }
564 mutex_unlock(&monc->mutex);
565 if (req) {
566 complete_all(&req->completion);
567 put_generic_request(req);
568 }
569 return;
570
571 bad:
572 pr_err("corrupt statfs reply, tid %llu\n", tid);
573 ceph_msg_dump(msg);
574 }
575
576 /*
577 * Do a synchronous statfs().
578 */
579 int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf)
580 {
581 struct ceph_mon_generic_request *req;
582 struct ceph_mon_statfs *h;
583 int err;
584
585 req = kzalloc(sizeof(*req), GFP_NOFS);
586 if (!req)
587 return -ENOMEM;
588
589 kref_init(&req->kref);
590 req->buf = buf;
591 init_completion(&req->completion);
592
593 err = -ENOMEM;
594 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS,
595 true);
596 if (!req->request)
597 goto out;
598 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 1024, GFP_NOFS,
599 true);
600 if (!req->reply)
601 goto out;
602
603 /* fill out request */
604 h = req->request->front.iov_base;
605 h->monhdr.have_version = 0;
606 h->monhdr.session_mon = cpu_to_le16(-1);
607 h->monhdr.session_mon_tid = 0;
608 h->fsid = monc->monmap->fsid;
609
610 err = do_generic_request(monc, req);
611
612 out:
613 put_generic_request(req);
614 return err;
615 }
616 EXPORT_SYMBOL(ceph_monc_do_statfs);
617
618 static void handle_get_version_reply(struct ceph_mon_client *monc,
619 struct ceph_msg *msg)
620 {
621 struct ceph_mon_generic_request *req;
622 u64 tid = le64_to_cpu(msg->hdr.tid);
623 void *p = msg->front.iov_base;
624 void *end = p + msg->front_alloc_len;
625 u64 handle;
626
627 dout("%s %p tid %llu\n", __func__, msg, tid);
628
629 ceph_decode_need(&p, end, 2*sizeof(u64), bad);
630 handle = ceph_decode_64(&p);
631 if (tid != 0 && tid != handle)
632 goto bad;
633
634 mutex_lock(&monc->mutex);
635 req = __lookup_generic_req(monc, handle);
636 if (req) {
637 *(u64 *)req->buf = ceph_decode_64(&p);
638 req->result = 0;
639 get_generic_request(req);
640 }
641 mutex_unlock(&monc->mutex);
642 if (req) {
643 complete_all(&req->completion);
644 put_generic_request(req);
645 }
646
647 return;
648 bad:
649 pr_err("corrupt mon_get_version reply, tid %llu\n", tid);
650 ceph_msg_dump(msg);
651 }
652
653 /*
654 * Send MMonGetVersion and wait for the reply.
655 *
656 * @what: one of "mdsmap", "osdmap" or "monmap"
657 */
658 int ceph_monc_do_get_version(struct ceph_mon_client *monc, const char *what,
659 u64 *newest)
660 {
661 struct ceph_mon_generic_request *req;
662 void *p, *end;
663 u64 tid;
664 int err;
665
666 req = kzalloc(sizeof(*req), GFP_NOFS);
667 if (!req)
668 return -ENOMEM;
669
670 kref_init(&req->kref);
671 req->buf = newest;
672 init_completion(&req->completion);
673
674 req->request = ceph_msg_new(CEPH_MSG_MON_GET_VERSION,
675 sizeof(u64) + sizeof(u32) + strlen(what),
676 GFP_NOFS, true);
677 if (!req->request) {
678 err = -ENOMEM;
679 goto out;
680 }
681
682 req->reply = ceph_msg_new(CEPH_MSG_MON_GET_VERSION_REPLY, 1024,
683 GFP_NOFS, true);
684 if (!req->reply) {
685 err = -ENOMEM;
686 goto out;
687 }
688
689 p = req->request->front.iov_base;
690 end = p + req->request->front_alloc_len;
691
692 /* fill out request */
693 mutex_lock(&monc->mutex);
694 tid = ++monc->last_tid;
695 ceph_encode_64(&p, tid); /* handle */
696 ceph_encode_string(&p, end, what, strlen(what));
697
698 err = __do_generic_request(monc, tid, req);
699
700 mutex_unlock(&monc->mutex);
701 out:
702 put_generic_request(req);
703 return err;
704 }
705 EXPORT_SYMBOL(ceph_monc_do_get_version);
706
707 /*
708 * Resend pending generic requests.
709 */
710 static void __resend_generic_request(struct ceph_mon_client *monc)
711 {
712 struct ceph_mon_generic_request *req;
713 struct rb_node *p;
714
715 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
716 req = rb_entry(p, struct ceph_mon_generic_request, node);
717 ceph_msg_revoke(req->request);
718 ceph_msg_revoke_incoming(req->reply);
719 ceph_con_send(&monc->con, ceph_msg_get(req->request));
720 }
721 }
722
723 /*
724 * Delayed work. If we haven't mounted yet, retry. Otherwise,
725 * renew/retry subscription as needed (in case it is timing out, or we
726 * got an ENOMEM). And keep the monitor connection alive.
727 */
728 static void delayed_work(struct work_struct *work)
729 {
730 struct ceph_mon_client *monc =
731 container_of(work, struct ceph_mon_client, delayed_work.work);
732
733 dout("monc delayed_work\n");
734 mutex_lock(&monc->mutex);
735 if (monc->hunting) {
736 __close_session(monc);
737 __open_session(monc); /* continue hunting */
738 } else {
739 ceph_con_keepalive(&monc->con);
740
741 __validate_auth(monc);
742
743 if (ceph_auth_is_authenticated(monc->auth))
744 __send_subscribe(monc);
745 }
746 __schedule_delayed(monc);
747 mutex_unlock(&monc->mutex);
748 }
749
750 /*
751 * On startup, we build a temporary monmap populated with the IPs
752 * provided by mount(2).
753 */
754 static int build_initial_monmap(struct ceph_mon_client *monc)
755 {
756 struct ceph_options *opt = monc->client->options;
757 struct ceph_entity_addr *mon_addr = opt->mon_addr;
758 int num_mon = opt->num_mon;
759 int i;
760
761 /* build initial monmap */
762 monc->monmap = kzalloc(sizeof(*monc->monmap) +
763 num_mon*sizeof(monc->monmap->mon_inst[0]),
764 GFP_KERNEL);
765 if (!monc->monmap)
766 return -ENOMEM;
767 for (i = 0; i < num_mon; i++) {
768 monc->monmap->mon_inst[i].addr = mon_addr[i];
769 monc->monmap->mon_inst[i].addr.nonce = 0;
770 monc->monmap->mon_inst[i].name.type =
771 CEPH_ENTITY_TYPE_MON;
772 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
773 }
774 monc->monmap->num_mon = num_mon;
775 return 0;
776 }
777
778 int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
779 {
780 int err = 0;
781
782 dout("init\n");
783 memset(monc, 0, sizeof(*monc));
784 monc->client = cl;
785 monc->monmap = NULL;
786 mutex_init(&monc->mutex);
787
788 err = build_initial_monmap(monc);
789 if (err)
790 goto out;
791
792 /* connection */
793 /* authentication */
794 monc->auth = ceph_auth_init(cl->options->name,
795 cl->options->key);
796 if (IS_ERR(monc->auth)) {
797 err = PTR_ERR(monc->auth);
798 goto out_monmap;
799 }
800 monc->auth->want_keys =
801 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
802 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
803
804 /* msgs */
805 err = -ENOMEM;
806 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
807 sizeof(struct ceph_mon_subscribe_ack),
808 GFP_NOFS, true);
809 if (!monc->m_subscribe_ack)
810 goto out_auth;
811
812 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS,
813 true);
814 if (!monc->m_subscribe)
815 goto out_subscribe_ack;
816
817 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS,
818 true);
819 if (!monc->m_auth_reply)
820 goto out_subscribe;
821
822 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS, true);
823 monc->pending_auth = 0;
824 if (!monc->m_auth)
825 goto out_auth_reply;
826
827 ceph_con_init(&monc->con, monc, &mon_con_ops,
828 &monc->client->msgr);
829
830 monc->cur_mon = -1;
831 monc->hunting = true;
832 monc->sub_renew_after = jiffies;
833 monc->sub_sent = 0;
834
835 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
836 monc->generic_request_tree = RB_ROOT;
837 monc->num_generic_requests = 0;
838 monc->last_tid = 0;
839
840 monc->have_mdsmap = 0;
841 monc->have_osdmap = 0;
842 monc->want_next_osdmap = 1;
843 return 0;
844
845 out_auth_reply:
846 ceph_msg_put(monc->m_auth_reply);
847 out_subscribe:
848 ceph_msg_put(monc->m_subscribe);
849 out_subscribe_ack:
850 ceph_msg_put(monc->m_subscribe_ack);
851 out_auth:
852 ceph_auth_destroy(monc->auth);
853 out_monmap:
854 kfree(monc->monmap);
855 out:
856 return err;
857 }
858 EXPORT_SYMBOL(ceph_monc_init);
859
860 void ceph_monc_stop(struct ceph_mon_client *monc)
861 {
862 dout("stop\n");
863 cancel_delayed_work_sync(&monc->delayed_work);
864
865 mutex_lock(&monc->mutex);
866 __close_session(monc);
867
868 mutex_unlock(&monc->mutex);
869
870 /*
871 * flush msgr queue before we destroy ourselves to ensure that:
872 * - any work that references our embedded con is finished.
873 * - any osd_client or other work that may reference an authorizer
874 * finishes before we shut down the auth subsystem.
875 */
876 ceph_msgr_flush();
877
878 ceph_auth_destroy(monc->auth);
879
880 ceph_msg_put(monc->m_auth);
881 ceph_msg_put(monc->m_auth_reply);
882 ceph_msg_put(monc->m_subscribe);
883 ceph_msg_put(monc->m_subscribe_ack);
884
885 kfree(monc->monmap);
886 }
887 EXPORT_SYMBOL(ceph_monc_stop);
888
889 static void handle_auth_reply(struct ceph_mon_client *monc,
890 struct ceph_msg *msg)
891 {
892 int ret;
893 int was_auth = 0;
894 int had_debugfs_info, init_debugfs = 0;
895
896 mutex_lock(&monc->mutex);
897 had_debugfs_info = have_debugfs_info(monc);
898 was_auth = ceph_auth_is_authenticated(monc->auth);
899 monc->pending_auth = 0;
900 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
901 msg->front.iov_len,
902 monc->m_auth->front.iov_base,
903 monc->m_auth->front_alloc_len);
904 if (ret < 0) {
905 monc->client->auth_err = ret;
906 wake_up_all(&monc->client->auth_wq);
907 } else if (ret > 0) {
908 __send_prepared_auth_request(monc, ret);
909 } else if (!was_auth && ceph_auth_is_authenticated(monc->auth)) {
910 dout("authenticated, starting session\n");
911
912 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
913 monc->client->msgr.inst.name.num =
914 cpu_to_le64(monc->auth->global_id);
915
916 __send_subscribe(monc);
917 __resend_generic_request(monc);
918 }
919
920 if (!had_debugfs_info && have_debugfs_info(monc)) {
921 pr_info("client%lld fsid %pU\n",
922 ceph_client_id(monc->client),
923 &monc->client->fsid);
924 init_debugfs = 1;
925 }
926 mutex_unlock(&monc->mutex);
927
928 if (init_debugfs) {
929 /*
930 * do debugfs initialization without mutex to avoid
931 * creating a locking dependency
932 */
933 ceph_debugfs_client_init(monc->client);
934 }
935 }
936
937 static int __validate_auth(struct ceph_mon_client *monc)
938 {
939 int ret;
940
941 if (monc->pending_auth)
942 return 0;
943
944 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
945 monc->m_auth->front_alloc_len);
946 if (ret <= 0)
947 return ret; /* either an error, or no need to authenticate */
948 __send_prepared_auth_request(monc, ret);
949 return 0;
950 }
951
952 int ceph_monc_validate_auth(struct ceph_mon_client *monc)
953 {
954 int ret;
955
956 mutex_lock(&monc->mutex);
957 ret = __validate_auth(monc);
958 mutex_unlock(&monc->mutex);
959 return ret;
960 }
961 EXPORT_SYMBOL(ceph_monc_validate_auth);
962
963 /*
964 * handle incoming message
965 */
966 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
967 {
968 struct ceph_mon_client *monc = con->private;
969 int type = le16_to_cpu(msg->hdr.type);
970
971 if (!monc)
972 return;
973
974 switch (type) {
975 case CEPH_MSG_AUTH_REPLY:
976 handle_auth_reply(monc, msg);
977 break;
978
979 case CEPH_MSG_MON_SUBSCRIBE_ACK:
980 handle_subscribe_ack(monc, msg);
981 break;
982
983 case CEPH_MSG_STATFS_REPLY:
984 handle_statfs_reply(monc, msg);
985 break;
986
987 case CEPH_MSG_MON_GET_VERSION_REPLY:
988 handle_get_version_reply(monc, msg);
989 break;
990
991 case CEPH_MSG_MON_MAP:
992 ceph_monc_handle_map(monc, msg);
993 break;
994
995 case CEPH_MSG_OSD_MAP:
996 ceph_osdc_handle_map(&monc->client->osdc, msg);
997 break;
998
999 default:
1000 /* can the chained handler handle it? */
1001 if (monc->client->extra_mon_dispatch &&
1002 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1003 break;
1004
1005 pr_err("received unknown message type %d %s\n", type,
1006 ceph_msg_type_name(type));
1007 }
1008 ceph_msg_put(msg);
1009 }
1010
1011 /*
1012 * Allocate memory for incoming message
1013 */
1014 static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1015 struct ceph_msg_header *hdr,
1016 int *skip)
1017 {
1018 struct ceph_mon_client *monc = con->private;
1019 int type = le16_to_cpu(hdr->type);
1020 int front_len = le32_to_cpu(hdr->front_len);
1021 struct ceph_msg *m = NULL;
1022
1023 *skip = 0;
1024
1025 switch (type) {
1026 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1027 m = ceph_msg_get(monc->m_subscribe_ack);
1028 break;
1029 case CEPH_MSG_STATFS_REPLY:
1030 return get_generic_reply(con, hdr, skip);
1031 case CEPH_MSG_AUTH_REPLY:
1032 m = ceph_msg_get(monc->m_auth_reply);
1033 break;
1034 case CEPH_MSG_MON_GET_VERSION_REPLY:
1035 if (le64_to_cpu(hdr->tid) != 0)
1036 return get_generic_reply(con, hdr, skip);
1037
1038 /*
1039 * Older OSDs don't set reply tid even if the orignal
1040 * request had a non-zero tid. Workaround this weirdness
1041 * by falling through to the allocate case.
1042 */
1043 case CEPH_MSG_MON_MAP:
1044 case CEPH_MSG_MDS_MAP:
1045 case CEPH_MSG_OSD_MAP:
1046 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1047 if (!m)
1048 return NULL; /* ENOMEM--return skip == 0 */
1049 break;
1050 }
1051
1052 if (!m) {
1053 pr_info("alloc_msg unknown type %d\n", type);
1054 *skip = 1;
1055 } else if (front_len > m->front_alloc_len) {
1056 pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
1057 front_len, m->front_alloc_len,
1058 (unsigned int)con->peer_name.type,
1059 le64_to_cpu(con->peer_name.num));
1060 ceph_msg_put(m);
1061 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1062 }
1063
1064 return m;
1065 }
1066
1067 /*
1068 * If the monitor connection resets, pick a new monitor and resubmit
1069 * any pending requests.
1070 */
1071 static void mon_fault(struct ceph_connection *con)
1072 {
1073 struct ceph_mon_client *monc = con->private;
1074
1075 if (!monc)
1076 return;
1077
1078 dout("mon_fault\n");
1079 mutex_lock(&monc->mutex);
1080 if (!con->private)
1081 goto out;
1082
1083 if (!monc->hunting)
1084 pr_info("mon%d %s session lost, "
1085 "hunting for new mon\n", monc->cur_mon,
1086 ceph_pr_addr(&monc->con.peer_addr.in_addr));
1087
1088 __close_session(monc);
1089 if (!monc->hunting) {
1090 /* start hunting */
1091 monc->hunting = true;
1092 __open_session(monc);
1093 } else {
1094 /* already hunting, let's wait a bit */
1095 __schedule_delayed(monc);
1096 }
1097 out:
1098 mutex_unlock(&monc->mutex);
1099 }
1100
1101 /*
1102 * We can ignore refcounting on the connection struct, as all references
1103 * will come from the messenger workqueue, which is drained prior to
1104 * mon_client destruction.
1105 */
1106 static struct ceph_connection *con_get(struct ceph_connection *con)
1107 {
1108 return con;
1109 }
1110
1111 static void con_put(struct ceph_connection *con)
1112 {
1113 }
1114
1115 static const struct ceph_connection_operations mon_con_ops = {
1116 .get = con_get,
1117 .put = con_put,
1118 .dispatch = dispatch,
1119 .fault = mon_fault,
1120 .alloc_msg = mon_alloc_msg,
1121 };
Linux kernel - Deliverables
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