Merge tag 'v3.10.55' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.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
300 /*
301 *
302 */
303 int ceph_monc_open_session(struct ceph_mon_client *monc)
304 {
305 mutex_lock(&monc->mutex);
306 __open_session(monc);
307 __schedule_delayed(monc);
308 mutex_unlock(&monc->mutex);
309 return 0;
310 }
311 EXPORT_SYMBOL(ceph_monc_open_session);
312
313 /*
314 * We require the fsid and global_id in order to initialize our
315 * debugfs dir.
316 */
317 static bool have_debugfs_info(struct ceph_mon_client *monc)
318 {
319 dout("have_debugfs_info fsid %d globalid %lld\n",
320 (int)monc->client->have_fsid, monc->auth->global_id);
321 return monc->client->have_fsid && monc->auth->global_id > 0;
322 }
323
324 /*
325 * The monitor responds with mount ack indicate mount success. The
326 * included client ticket allows the client to talk to MDSs and OSDs.
327 */
328 static void ceph_monc_handle_map(struct ceph_mon_client *monc,
329 struct ceph_msg *msg)
330 {
331 struct ceph_client *client = monc->client;
332 struct ceph_monmap *monmap = NULL, *old = monc->monmap;
333 void *p, *end;
334 int had_debugfs_info, init_debugfs = 0;
335
336 mutex_lock(&monc->mutex);
337
338 had_debugfs_info = have_debugfs_info(monc);
339
340 dout("handle_monmap\n");
341 p = msg->front.iov_base;
342 end = p + msg->front.iov_len;
343
344 monmap = ceph_monmap_decode(p, end);
345 if (IS_ERR(monmap)) {
346 pr_err("problem decoding monmap, %d\n",
347 (int)PTR_ERR(monmap));
348 goto out;
349 }
350
351 if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) {
352 kfree(monmap);
353 goto out;
354 }
355
356 client->monc.monmap = monmap;
357 kfree(old);
358
359 if (!client->have_fsid) {
360 client->have_fsid = true;
361 if (!had_debugfs_info && have_debugfs_info(monc)) {
362 pr_info("client%lld fsid %pU\n",
363 ceph_client_id(monc->client),
364 &monc->client->fsid);
365 init_debugfs = 1;
366 }
367 mutex_unlock(&monc->mutex);
368
369 if (init_debugfs) {
370 /*
371 * do debugfs initialization without mutex to avoid
372 * creating a locking dependency
373 */
374 ceph_debugfs_client_init(monc->client);
375 }
376
377 goto out_unlocked;
378 }
379 out:
380 mutex_unlock(&monc->mutex);
381 out_unlocked:
382 wake_up_all(&client->auth_wq);
383 }
384
385 /*
386 * generic requests (e.g., statfs, poolop)
387 */
388 static struct ceph_mon_generic_request *__lookup_generic_req(
389 struct ceph_mon_client *monc, u64 tid)
390 {
391 struct ceph_mon_generic_request *req;
392 struct rb_node *n = monc->generic_request_tree.rb_node;
393
394 while (n) {
395 req = rb_entry(n, struct ceph_mon_generic_request, node);
396 if (tid < req->tid)
397 n = n->rb_left;
398 else if (tid > req->tid)
399 n = n->rb_right;
400 else
401 return req;
402 }
403 return NULL;
404 }
405
406 static void __insert_generic_request(struct ceph_mon_client *monc,
407 struct ceph_mon_generic_request *new)
408 {
409 struct rb_node **p = &monc->generic_request_tree.rb_node;
410 struct rb_node *parent = NULL;
411 struct ceph_mon_generic_request *req = NULL;
412
413 while (*p) {
414 parent = *p;
415 req = rb_entry(parent, struct ceph_mon_generic_request, node);
416 if (new->tid < req->tid)
417 p = &(*p)->rb_left;
418 else if (new->tid > req->tid)
419 p = &(*p)->rb_right;
420 else
421 BUG();
422 }
423
424 rb_link_node(&new->node, parent, p);
425 rb_insert_color(&new->node, &monc->generic_request_tree);
426 }
427
428 static void release_generic_request(struct kref *kref)
429 {
430 struct ceph_mon_generic_request *req =
431 container_of(kref, struct ceph_mon_generic_request, kref);
432
433 if (req->reply)
434 ceph_msg_put(req->reply);
435 if (req->request)
436 ceph_msg_put(req->request);
437
438 kfree(req);
439 }
440
441 static void put_generic_request(struct ceph_mon_generic_request *req)
442 {
443 kref_put(&req->kref, release_generic_request);
444 }
445
446 static void get_generic_request(struct ceph_mon_generic_request *req)
447 {
448 kref_get(&req->kref);
449 }
450
451 static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
452 struct ceph_msg_header *hdr,
453 int *skip)
454 {
455 struct ceph_mon_client *monc = con->private;
456 struct ceph_mon_generic_request *req;
457 u64 tid = le64_to_cpu(hdr->tid);
458 struct ceph_msg *m;
459
460 mutex_lock(&monc->mutex);
461 req = __lookup_generic_req(monc, tid);
462 if (!req) {
463 dout("get_generic_reply %lld dne\n", tid);
464 *skip = 1;
465 m = NULL;
466 } else {
467 dout("get_generic_reply %lld got %p\n", tid, req->reply);
468 *skip = 0;
469 m = ceph_msg_get(req->reply);
470 /*
471 * we don't need to track the connection reading into
472 * this reply because we only have one open connection
473 * at a time, ever.
474 */
475 }
476 mutex_unlock(&monc->mutex);
477 return m;
478 }
479
480 static int do_generic_request(struct ceph_mon_client *monc,
481 struct ceph_mon_generic_request *req)
482 {
483 int err;
484
485 /* register request */
486 mutex_lock(&monc->mutex);
487 req->tid = ++monc->last_tid;
488 req->request->hdr.tid = cpu_to_le64(req->tid);
489 __insert_generic_request(monc, req);
490 monc->num_generic_requests++;
491 ceph_con_send(&monc->con, ceph_msg_get(req->request));
492 mutex_unlock(&monc->mutex);
493
494 err = wait_for_completion_interruptible(&req->completion);
495
496 mutex_lock(&monc->mutex);
497 rb_erase(&req->node, &monc->generic_request_tree);
498 monc->num_generic_requests--;
499 mutex_unlock(&monc->mutex);
500
501 if (!err)
502 err = req->result;
503 return err;
504 }
505
506 /*
507 * statfs
508 */
509 static void handle_statfs_reply(struct ceph_mon_client *monc,
510 struct ceph_msg *msg)
511 {
512 struct ceph_mon_generic_request *req;
513 struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
514 u64 tid = le64_to_cpu(msg->hdr.tid);
515
516 if (msg->front.iov_len != sizeof(*reply))
517 goto bad;
518 dout("handle_statfs_reply %p tid %llu\n", msg, tid);
519
520 mutex_lock(&monc->mutex);
521 req = __lookup_generic_req(monc, tid);
522 if (req) {
523 *(struct ceph_statfs *)req->buf = reply->st;
524 req->result = 0;
525 get_generic_request(req);
526 }
527 mutex_unlock(&monc->mutex);
528 if (req) {
529 complete_all(&req->completion);
530 put_generic_request(req);
531 }
532 return;
533
534 bad:
535 pr_err("corrupt generic reply, tid %llu\n", tid);
536 ceph_msg_dump(msg);
537 }
538
539 /*
540 * Do a synchronous statfs().
541 */
542 int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf)
543 {
544 struct ceph_mon_generic_request *req;
545 struct ceph_mon_statfs *h;
546 int err;
547
548 req = kzalloc(sizeof(*req), GFP_NOFS);
549 if (!req)
550 return -ENOMEM;
551
552 kref_init(&req->kref);
553 req->buf = buf;
554 req->buf_len = sizeof(*buf);
555 init_completion(&req->completion);
556
557 err = -ENOMEM;
558 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS,
559 true);
560 if (!req->request)
561 goto out;
562 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 1024, GFP_NOFS,
563 true);
564 if (!req->reply)
565 goto out;
566
567 /* fill out request */
568 h = req->request->front.iov_base;
569 h->monhdr.have_version = 0;
570 h->monhdr.session_mon = cpu_to_le16(-1);
571 h->monhdr.session_mon_tid = 0;
572 h->fsid = monc->monmap->fsid;
573
574 err = do_generic_request(monc, req);
575
576 out:
577 kref_put(&req->kref, release_generic_request);
578 return err;
579 }
580 EXPORT_SYMBOL(ceph_monc_do_statfs);
581
582 /*
583 * pool ops
584 */
585 static int get_poolop_reply_buf(const char *src, size_t src_len,
586 char *dst, size_t dst_len)
587 {
588 u32 buf_len;
589
590 if (src_len != sizeof(u32) + dst_len)
591 return -EINVAL;
592
593 buf_len = le32_to_cpu(*(u32 *)src);
594 if (buf_len != dst_len)
595 return -EINVAL;
596
597 memcpy(dst, src + sizeof(u32), dst_len);
598 return 0;
599 }
600
601 static void handle_poolop_reply(struct ceph_mon_client *monc,
602 struct ceph_msg *msg)
603 {
604 struct ceph_mon_generic_request *req;
605 struct ceph_mon_poolop_reply *reply = msg->front.iov_base;
606 u64 tid = le64_to_cpu(msg->hdr.tid);
607
608 if (msg->front.iov_len < sizeof(*reply))
609 goto bad;
610 dout("handle_poolop_reply %p tid %llu\n", msg, tid);
611
612 mutex_lock(&monc->mutex);
613 req = __lookup_generic_req(monc, tid);
614 if (req) {
615 if (req->buf_len &&
616 get_poolop_reply_buf(msg->front.iov_base + sizeof(*reply),
617 msg->front.iov_len - sizeof(*reply),
618 req->buf, req->buf_len) < 0) {
619 mutex_unlock(&monc->mutex);
620 goto bad;
621 }
622 req->result = le32_to_cpu(reply->reply_code);
623 get_generic_request(req);
624 }
625 mutex_unlock(&monc->mutex);
626 if (req) {
627 complete(&req->completion);
628 put_generic_request(req);
629 }
630 return;
631
632 bad:
633 pr_err("corrupt generic reply, tid %llu\n", tid);
634 ceph_msg_dump(msg);
635 }
636
637 /*
638 * Do a synchronous pool op.
639 */
640 static int do_poolop(struct ceph_mon_client *monc, u32 op,
641 u32 pool, u64 snapid,
642 char *buf, int len)
643 {
644 struct ceph_mon_generic_request *req;
645 struct ceph_mon_poolop *h;
646 int err;
647
648 req = kzalloc(sizeof(*req), GFP_NOFS);
649 if (!req)
650 return -ENOMEM;
651
652 kref_init(&req->kref);
653 req->buf = buf;
654 req->buf_len = len;
655 init_completion(&req->completion);
656
657 err = -ENOMEM;
658 req->request = ceph_msg_new(CEPH_MSG_POOLOP, sizeof(*h), GFP_NOFS,
659 true);
660 if (!req->request)
661 goto out;
662 req->reply = ceph_msg_new(CEPH_MSG_POOLOP_REPLY, 1024, GFP_NOFS,
663 true);
664 if (!req->reply)
665 goto out;
666
667 /* fill out request */
668 req->request->hdr.version = cpu_to_le16(2);
669 h = req->request->front.iov_base;
670 h->monhdr.have_version = 0;
671 h->monhdr.session_mon = cpu_to_le16(-1);
672 h->monhdr.session_mon_tid = 0;
673 h->fsid = monc->monmap->fsid;
674 h->pool = cpu_to_le32(pool);
675 h->op = cpu_to_le32(op);
676 h->auid = 0;
677 h->snapid = cpu_to_le64(snapid);
678 h->name_len = 0;
679
680 err = do_generic_request(monc, req);
681
682 out:
683 kref_put(&req->kref, release_generic_request);
684 return err;
685 }
686
687 int ceph_monc_create_snapid(struct ceph_mon_client *monc,
688 u32 pool, u64 *snapid)
689 {
690 return do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP,
691 pool, 0, (char *)snapid, sizeof(*snapid));
692
693 }
694 EXPORT_SYMBOL(ceph_monc_create_snapid);
695
696 int ceph_monc_delete_snapid(struct ceph_mon_client *monc,
697 u32 pool, u64 snapid)
698 {
699 return do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP,
700 pool, snapid, NULL, 0);
701
702 }
703
704 /*
705 * Resend pending generic requests.
706 */
707 static void __resend_generic_request(struct ceph_mon_client *monc)
708 {
709 struct ceph_mon_generic_request *req;
710 struct rb_node *p;
711
712 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
713 req = rb_entry(p, struct ceph_mon_generic_request, node);
714 ceph_msg_revoke(req->request);
715 ceph_msg_revoke_incoming(req->reply);
716 ceph_con_send(&monc->con, ceph_msg_get(req->request));
717 }
718 }
719
720 /*
721 * Delayed work. If we haven't mounted yet, retry. Otherwise,
722 * renew/retry subscription as needed (in case it is timing out, or we
723 * got an ENOMEM). And keep the monitor connection alive.
724 */
725 static void delayed_work(struct work_struct *work)
726 {
727 struct ceph_mon_client *monc =
728 container_of(work, struct ceph_mon_client, delayed_work.work);
729
730 dout("monc delayed_work\n");
731 mutex_lock(&monc->mutex);
732 if (monc->hunting) {
733 __close_session(monc);
734 __open_session(monc); /* continue hunting */
735 } else {
736 ceph_con_keepalive(&monc->con);
737
738 __validate_auth(monc);
739
740 if (ceph_auth_is_authenticated(monc->auth))
741 __send_subscribe(monc);
742 }
743 __schedule_delayed(monc);
744 mutex_unlock(&monc->mutex);
745 }
746
747 /*
748 * On startup, we build a temporary monmap populated with the IPs
749 * provided by mount(2).
750 */
751 static int build_initial_monmap(struct ceph_mon_client *monc)
752 {
753 struct ceph_options *opt = monc->client->options;
754 struct ceph_entity_addr *mon_addr = opt->mon_addr;
755 int num_mon = opt->num_mon;
756 int i;
757
758 /* build initial monmap */
759 monc->monmap = kzalloc(sizeof(*monc->monmap) +
760 num_mon*sizeof(monc->monmap->mon_inst[0]),
761 GFP_KERNEL);
762 if (!monc->monmap)
763 return -ENOMEM;
764 for (i = 0; i < num_mon; i++) {
765 monc->monmap->mon_inst[i].addr = mon_addr[i];
766 monc->monmap->mon_inst[i].addr.nonce = 0;
767 monc->monmap->mon_inst[i].name.type =
768 CEPH_ENTITY_TYPE_MON;
769 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
770 }
771 monc->monmap->num_mon = num_mon;
772 return 0;
773 }
774
775 int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
776 {
777 int err = 0;
778
779 dout("init\n");
780 memset(monc, 0, sizeof(*monc));
781 monc->client = cl;
782 monc->monmap = NULL;
783 mutex_init(&monc->mutex);
784
785 err = build_initial_monmap(monc);
786 if (err)
787 goto out;
788
789 /* connection */
790 /* authentication */
791 monc->auth = ceph_auth_init(cl->options->name,
792 cl->options->key);
793 if (IS_ERR(monc->auth)) {
794 err = PTR_ERR(monc->auth);
795 goto out_monmap;
796 }
797 monc->auth->want_keys =
798 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
799 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
800
801 /* msgs */
802 err = -ENOMEM;
803 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
804 sizeof(struct ceph_mon_subscribe_ack),
805 GFP_NOFS, true);
806 if (!monc->m_subscribe_ack)
807 goto out_auth;
808
809 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS,
810 true);
811 if (!monc->m_subscribe)
812 goto out_subscribe_ack;
813
814 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS,
815 true);
816 if (!monc->m_auth_reply)
817 goto out_subscribe;
818
819 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS, true);
820 monc->pending_auth = 0;
821 if (!monc->m_auth)
822 goto out_auth_reply;
823
824 ceph_con_init(&monc->con, monc, &mon_con_ops,
825 &monc->client->msgr);
826
827 monc->cur_mon = -1;
828 monc->hunting = true;
829 monc->sub_renew_after = jiffies;
830 monc->sub_sent = 0;
831
832 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
833 monc->generic_request_tree = RB_ROOT;
834 monc->num_generic_requests = 0;
835 monc->last_tid = 0;
836
837 monc->have_mdsmap = 0;
838 monc->have_osdmap = 0;
839 monc->want_next_osdmap = 1;
840 return 0;
841
842 out_auth_reply:
843 ceph_msg_put(monc->m_auth_reply);
844 out_subscribe:
845 ceph_msg_put(monc->m_subscribe);
846 out_subscribe_ack:
847 ceph_msg_put(monc->m_subscribe_ack);
848 out_auth:
849 ceph_auth_destroy(monc->auth);
850 out_monmap:
851 kfree(monc->monmap);
852 out:
853 return err;
854 }
855 EXPORT_SYMBOL(ceph_monc_init);
856
857 void ceph_monc_stop(struct ceph_mon_client *monc)
858 {
859 dout("stop\n");
860 cancel_delayed_work_sync(&monc->delayed_work);
861
862 mutex_lock(&monc->mutex);
863 __close_session(monc);
864
865 mutex_unlock(&monc->mutex);
866
867 /*
868 * flush msgr queue before we destroy ourselves to ensure that:
869 * - any work that references our embedded con is finished.
870 * - any osd_client or other work that may reference an authorizer
871 * finishes before we shut down the auth subsystem.
872 */
873 ceph_msgr_flush();
874
875 ceph_auth_destroy(monc->auth);
876
877 ceph_msg_put(monc->m_auth);
878 ceph_msg_put(monc->m_auth_reply);
879 ceph_msg_put(monc->m_subscribe);
880 ceph_msg_put(monc->m_subscribe_ack);
881
882 kfree(monc->monmap);
883 }
884 EXPORT_SYMBOL(ceph_monc_stop);
885
886 static void handle_auth_reply(struct ceph_mon_client *monc,
887 struct ceph_msg *msg)
888 {
889 int ret;
890 int was_auth = 0;
891 int had_debugfs_info, init_debugfs = 0;
892
893 mutex_lock(&monc->mutex);
894 had_debugfs_info = have_debugfs_info(monc);
895 was_auth = ceph_auth_is_authenticated(monc->auth);
896 monc->pending_auth = 0;
897 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
898 msg->front.iov_len,
899 monc->m_auth->front.iov_base,
900 monc->m_auth->front_alloc_len);
901 if (ret < 0) {
902 monc->client->auth_err = ret;
903 wake_up_all(&monc->client->auth_wq);
904 } else if (ret > 0) {
905 __send_prepared_auth_request(monc, ret);
906 } else if (!was_auth && ceph_auth_is_authenticated(monc->auth)) {
907 dout("authenticated, starting session\n");
908
909 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
910 monc->client->msgr.inst.name.num =
911 cpu_to_le64(monc->auth->global_id);
912
913 __send_subscribe(monc);
914 __resend_generic_request(monc);
915 }
916
917 if (!had_debugfs_info && have_debugfs_info(monc)) {
918 pr_info("client%lld fsid %pU\n",
919 ceph_client_id(monc->client),
920 &monc->client->fsid);
921 init_debugfs = 1;
922 }
923 mutex_unlock(&monc->mutex);
924
925 if (init_debugfs) {
926 /*
927 * do debugfs initialization without mutex to avoid
928 * creating a locking dependency
929 */
930 ceph_debugfs_client_init(monc->client);
931 }
932 }
933
934 static int __validate_auth(struct ceph_mon_client *monc)
935 {
936 int ret;
937
938 if (monc->pending_auth)
939 return 0;
940
941 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
942 monc->m_auth->front_alloc_len);
943 if (ret <= 0)
944 return ret; /* either an error, or no need to authenticate */
945 __send_prepared_auth_request(monc, ret);
946 return 0;
947 }
948
949 int ceph_monc_validate_auth(struct ceph_mon_client *monc)
950 {
951 int ret;
952
953 mutex_lock(&monc->mutex);
954 ret = __validate_auth(monc);
955 mutex_unlock(&monc->mutex);
956 return ret;
957 }
958 EXPORT_SYMBOL(ceph_monc_validate_auth);
959
960 /*
961 * handle incoming message
962 */
963 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
964 {
965 struct ceph_mon_client *monc = con->private;
966 int type = le16_to_cpu(msg->hdr.type);
967
968 if (!monc)
969 return;
970
971 switch (type) {
972 case CEPH_MSG_AUTH_REPLY:
973 handle_auth_reply(monc, msg);
974 break;
975
976 case CEPH_MSG_MON_SUBSCRIBE_ACK:
977 handle_subscribe_ack(monc, msg);
978 break;
979
980 case CEPH_MSG_STATFS_REPLY:
981 handle_statfs_reply(monc, msg);
982 break;
983
984 case CEPH_MSG_POOLOP_REPLY:
985 handle_poolop_reply(monc, msg);
986 break;
987
988 case CEPH_MSG_MON_MAP:
989 ceph_monc_handle_map(monc, msg);
990 break;
991
992 case CEPH_MSG_OSD_MAP:
993 ceph_osdc_handle_map(&monc->client->osdc, msg);
994 break;
995
996 default:
997 /* can the chained handler handle it? */
998 if (monc->client->extra_mon_dispatch &&
999 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1000 break;
1001
1002 pr_err("received unknown message type %d %s\n", type,
1003 ceph_msg_type_name(type));
1004 }
1005 ceph_msg_put(msg);
1006 }
1007
1008 /*
1009 * Allocate memory for incoming message
1010 */
1011 static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1012 struct ceph_msg_header *hdr,
1013 int *skip)
1014 {
1015 struct ceph_mon_client *monc = con->private;
1016 int type = le16_to_cpu(hdr->type);
1017 int front_len = le32_to_cpu(hdr->front_len);
1018 struct ceph_msg *m = NULL;
1019
1020 *skip = 0;
1021
1022 switch (type) {
1023 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1024 m = ceph_msg_get(monc->m_subscribe_ack);
1025 break;
1026 case CEPH_MSG_POOLOP_REPLY:
1027 case CEPH_MSG_STATFS_REPLY:
1028 return get_generic_reply(con, hdr, skip);
1029 case CEPH_MSG_AUTH_REPLY:
1030 m = ceph_msg_get(monc->m_auth_reply);
1031 break;
1032 case CEPH_MSG_MON_MAP:
1033 case CEPH_MSG_MDS_MAP:
1034 case CEPH_MSG_OSD_MAP:
1035 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1036 if (!m)
1037 return NULL; /* ENOMEM--return skip == 0 */
1038 break;
1039 }
1040
1041 if (!m) {
1042 pr_info("alloc_msg unknown type %d\n", type);
1043 *skip = 1;
1044 } else if (front_len > m->front_alloc_len) {
1045 pr_warning("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
1046 front_len, m->front_alloc_len,
1047 (unsigned int)con->peer_name.type,
1048 le64_to_cpu(con->peer_name.num));
1049 ceph_msg_put(m);
1050 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1051 }
1052
1053 return m;
1054 }
1055
1056 /*
1057 * If the monitor connection resets, pick a new monitor and resubmit
1058 * any pending requests.
1059 */
1060 static void mon_fault(struct ceph_connection *con)
1061 {
1062 struct ceph_mon_client *monc = con->private;
1063
1064 if (!monc)
1065 return;
1066
1067 dout("mon_fault\n");
1068 mutex_lock(&monc->mutex);
1069 if (!con->private)
1070 goto out;
1071
1072 if (!monc->hunting)
1073 pr_info("mon%d %s session lost, "
1074 "hunting for new mon\n", monc->cur_mon,
1075 ceph_pr_addr(&monc->con.peer_addr.in_addr));
1076
1077 __close_session(monc);
1078 if (!monc->hunting) {
1079 /* start hunting */
1080 monc->hunting = true;
1081 __open_session(monc);
1082 } else {
1083 /* already hunting, let's wait a bit */
1084 __schedule_delayed(monc);
1085 }
1086 out:
1087 mutex_unlock(&monc->mutex);
1088 }
1089
1090 /*
1091 * We can ignore refcounting on the connection struct, as all references
1092 * will come from the messenger workqueue, which is drained prior to
1093 * mon_client destruction.
1094 */
1095 static struct ceph_connection *con_get(struct ceph_connection *con)
1096 {
1097 return con;
1098 }
1099
1100 static void con_put(struct ceph_connection *con)
1101 {
1102 }
1103
1104 static const struct ceph_connection_operations mon_con_ops = {
1105 .get = con_get,
1106 .put = con_put,
1107 .dispatch = dispatch,
1108 .fault = mon_fault,
1109 .alloc_msg = mon_alloc_msg,
1110 };