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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/module.h>
5#include <linux/types.h>
6#include <linux/slab.h>
7#include <linux/random.h>
8#include <linux/sched.h>
9
10#include <linux/ceph/ceph_features.h>
11#include <linux/ceph/mon_client.h>
12#include <linux/ceph/libceph.h>
13#include <linux/ceph/debugfs.h>
14#include <linux/ceph/decode.h>
15#include <linux/ceph/auth.h>
16
17/*
18 * Interact with Ceph monitor cluster. Handle requests for new map
19 * versions, and periodically resend as needed. Also implement
20 * statfs() and umount().
21 *
22 * A small cluster of Ceph "monitors" are responsible for managing critical
23 * cluster configuration and state information. An odd number (e.g., 3, 5)
24 * of cmon daemons use a modified version of the Paxos part-time parliament
25 * algorithm to manage the MDS map (mds cluster membership), OSD map, and
26 * list of clients who have mounted the file system.
27 *
28 * We maintain an open, active session with a monitor at all times in order to
29 * receive timely MDSMap updates. We periodically send a keepalive byte on the
30 * TCP socket to ensure we detect a failure. If the connection does break, we
31 * randomly hunt for a new monitor. Once the connection is reestablished, we
32 * resend any outstanding requests.
33 */
34
35static const struct ceph_connection_operations mon_con_ops;
36
37static int __validate_auth(struct ceph_mon_client *monc);
38
39static int decode_mon_info(void **p, void *end, bool msgr2,
40 struct ceph_entity_addr *addr)
41{
42 void *mon_info_end;
43 u32 struct_len;
44 u8 struct_v;
45 int ret;
46
47 ret = ceph_start_decoding(p, end, 1, "mon_info_t", &struct_v,
48 &struct_len);
49 if (ret)
50 return ret;
51
52 mon_info_end = *p + struct_len;
53 ceph_decode_skip_string(p, end, e_inval); /* skip mon name */
54 ret = ceph_decode_entity_addrvec(p, end, msgr2, addr);
55 if (ret)
56 return ret;
57
58 *p = mon_info_end;
59 return 0;
60
61e_inval:
62 return -EINVAL;
63}
64
65/*
66 * Decode a monmap blob (e.g., during mount).
67 *
68 * Assume MonMap v3 (i.e. encoding with MONNAMES and MONENC).
69 */
70static struct ceph_monmap *ceph_monmap_decode(void **p, void *end, bool msgr2)
71{
72 struct ceph_monmap *monmap = NULL;
73 struct ceph_fsid fsid;
74 u32 struct_len;
75 int blob_len;
76 int num_mon;
77 u8 struct_v;
78 u32 epoch;
79 int ret;
80 int i;
81
82 ceph_decode_32_safe(p, end, blob_len, e_inval);
83 ceph_decode_need(p, end, blob_len, e_inval);
84
85 ret = ceph_start_decoding(p, end, 6, "monmap", &struct_v, &struct_len);
86 if (ret)
87 goto fail;
88
89 dout("%s struct_v %d\n", __func__, struct_v);
90 ceph_decode_copy_safe(p, end, &fsid, sizeof(fsid), e_inval);
91 ceph_decode_32_safe(p, end, epoch, e_inval);
92 if (struct_v >= 6) {
93 u32 feat_struct_len;
94 u8 feat_struct_v;
95
96 *p += sizeof(struct ceph_timespec); /* skip last_changed */
97 *p += sizeof(struct ceph_timespec); /* skip created */
98
99 ret = ceph_start_decoding(p, end, 1, "mon_feature_t",
100 &feat_struct_v, &feat_struct_len);
101 if (ret)
102 goto fail;
103
104 *p += feat_struct_len; /* skip persistent_features */
105
106 ret = ceph_start_decoding(p, end, 1, "mon_feature_t",
107 &feat_struct_v, &feat_struct_len);
108 if (ret)
109 goto fail;
110
111 *p += feat_struct_len; /* skip optional_features */
112 }
113 ceph_decode_32_safe(p, end, num_mon, e_inval);
114
115 dout("%s fsid %pU epoch %u num_mon %d\n", __func__, &fsid, epoch,
116 num_mon);
117 if (num_mon > CEPH_MAX_MON)
118 goto e_inval;
119
120 monmap = kmalloc(struct_size(monmap, mon_inst, num_mon), GFP_NOIO);
121 if (!monmap) {
122 ret = -ENOMEM;
123 goto fail;
124 }
125 monmap->fsid = fsid;
126 monmap->epoch = epoch;
127 monmap->num_mon = num_mon;
128
129 /* legacy_mon_addr map or mon_info map */
130 for (i = 0; i < num_mon; i++) {
131 struct ceph_entity_inst *inst = &monmap->mon_inst[i];
132
133 ceph_decode_skip_string(p, end, e_inval); /* skip mon name */
134 inst->name.type = CEPH_ENTITY_TYPE_MON;
135 inst->name.num = cpu_to_le64(i);
136
137 if (struct_v >= 6)
138 ret = decode_mon_info(p, end, msgr2, &inst->addr);
139 else
140 ret = ceph_decode_entity_addr(p, end, &inst->addr);
141 if (ret)
142 goto fail;
143
144 dout("%s mon%d addr %s\n", __func__, i,
145 ceph_pr_addr(&inst->addr));
146 }
147
148 return monmap;
149
150e_inval:
151 ret = -EINVAL;
152fail:
153 kfree(monmap);
154 return ERR_PTR(ret);
155}
156
157/*
158 * return true if *addr is included in the monmap.
159 */
160int ceph_monmap_contains(struct ceph_monmap *m, struct ceph_entity_addr *addr)
161{
162 int i;
163
164 for (i = 0; i < m->num_mon; i++) {
165 if (ceph_addr_equal_no_type(addr, &m->mon_inst[i].addr))
166 return 1;
167 }
168
169 return 0;
170}
171
172/*
173 * Send an auth request.
174 */
175static void __send_prepared_auth_request(struct ceph_mon_client *monc, int len)
176{
177 monc->pending_auth = 1;
178 monc->m_auth->front.iov_len = len;
179 monc->m_auth->hdr.front_len = cpu_to_le32(len);
180 ceph_msg_revoke(monc->m_auth);
181 ceph_msg_get(monc->m_auth); /* keep our ref */
182 ceph_con_send(&monc->con, monc->m_auth);
183}
184
185/*
186 * Close monitor session, if any.
187 */
188static void __close_session(struct ceph_mon_client *monc)
189{
190 dout("__close_session closing mon%d\n", monc->cur_mon);
191 ceph_msg_revoke(monc->m_auth);
192 ceph_msg_revoke_incoming(monc->m_auth_reply);
193 ceph_msg_revoke(monc->m_subscribe);
194 ceph_msg_revoke_incoming(monc->m_subscribe_ack);
195 ceph_con_close(&monc->con);
196
197 monc->pending_auth = 0;
198 ceph_auth_reset(monc->auth);
199}
200
201/*
202 * Pick a new monitor at random and set cur_mon. If we are repicking
203 * (i.e. cur_mon is already set), be sure to pick a different one.
204 */
205static void pick_new_mon(struct ceph_mon_client *monc)
206{
207 int old_mon = monc->cur_mon;
208
209 BUG_ON(monc->monmap->num_mon < 1);
210
211 if (monc->monmap->num_mon == 1) {
212 monc->cur_mon = 0;
213 } else {
214 int max = monc->monmap->num_mon;
215 int o = -1;
216 int n;
217
218 if (monc->cur_mon >= 0) {
219 if (monc->cur_mon < monc->monmap->num_mon)
220 o = monc->cur_mon;
221 if (o >= 0)
222 max--;
223 }
224
225 n = get_random_u32_below(max);
226 if (o >= 0 && n >= o)
227 n++;
228
229 monc->cur_mon = n;
230 }
231
232 dout("%s mon%d -> mon%d out of %d mons\n", __func__, old_mon,
233 monc->cur_mon, monc->monmap->num_mon);
234}
235
236/*
237 * Open a session with a new monitor.
238 */
239static void __open_session(struct ceph_mon_client *monc)
240{
241 int ret;
242
243 pick_new_mon(monc);
244
245 monc->hunting = true;
246 if (monc->had_a_connection) {
247 monc->hunt_mult *= CEPH_MONC_HUNT_BACKOFF;
248 if (monc->hunt_mult > CEPH_MONC_HUNT_MAX_MULT)
249 monc->hunt_mult = CEPH_MONC_HUNT_MAX_MULT;
250 }
251
252 monc->sub_renew_after = jiffies; /* i.e., expired */
253 monc->sub_renew_sent = 0;
254
255 dout("%s opening mon%d\n", __func__, monc->cur_mon);
256 ceph_con_open(&monc->con, CEPH_ENTITY_TYPE_MON, monc->cur_mon,
257 &monc->monmap->mon_inst[monc->cur_mon].addr);
258
259 /*
260 * Queue a keepalive to ensure that in case of an early fault
261 * the messenger doesn't put us into STANDBY state and instead
262 * retries. This also ensures that our timestamp is valid by
263 * the time we finish hunting and delayed_work() checks it.
264 */
265 ceph_con_keepalive(&monc->con);
266 if (ceph_msgr2(monc->client)) {
267 monc->pending_auth = 1;
268 return;
269 }
270
271 /* initiate authentication handshake */
272 ret = ceph_auth_build_hello(monc->auth,
273 monc->m_auth->front.iov_base,
274 monc->m_auth->front_alloc_len);
275 BUG_ON(ret <= 0);
276 __send_prepared_auth_request(monc, ret);
277}
278
279static void reopen_session(struct ceph_mon_client *monc)
280{
281 if (!monc->hunting)
282 pr_info("mon%d %s session lost, hunting for new mon\n",
283 monc->cur_mon, ceph_pr_addr(&monc->con.peer_addr));
284
285 __close_session(monc);
286 __open_session(monc);
287}
288
289void ceph_monc_reopen_session(struct ceph_mon_client *monc)
290{
291 mutex_lock(&monc->mutex);
292 reopen_session(monc);
293 mutex_unlock(&monc->mutex);
294}
295
296static void un_backoff(struct ceph_mon_client *monc)
297{
298 monc->hunt_mult /= 2; /* reduce by 50% */
299 if (monc->hunt_mult < 1)
300 monc->hunt_mult = 1;
301 dout("%s hunt_mult now %d\n", __func__, monc->hunt_mult);
302}
303
304/*
305 * Reschedule delayed work timer.
306 */
307static void __schedule_delayed(struct ceph_mon_client *monc)
308{
309 unsigned long delay;
310
311 if (monc->hunting)
312 delay = CEPH_MONC_HUNT_INTERVAL * monc->hunt_mult;
313 else
314 delay = CEPH_MONC_PING_INTERVAL;
315
316 dout("__schedule_delayed after %lu\n", delay);
317 mod_delayed_work(system_wq, &monc->delayed_work,
318 round_jiffies_relative(delay));
319}
320
321const char *ceph_sub_str[] = {
322 [CEPH_SUB_MONMAP] = "monmap",
323 [CEPH_SUB_OSDMAP] = "osdmap",
324 [CEPH_SUB_FSMAP] = "fsmap.user",
325 [CEPH_SUB_MDSMAP] = "mdsmap",
326};
327
328/*
329 * Send subscribe request for one or more maps, according to
330 * monc->subs.
331 */
332static void __send_subscribe(struct ceph_mon_client *monc)
333{
334 struct ceph_msg *msg = monc->m_subscribe;
335 void *p = msg->front.iov_base;
336 void *const end = p + msg->front_alloc_len;
337 int num = 0;
338 int i;
339
340 dout("%s sent %lu\n", __func__, monc->sub_renew_sent);
341
342 BUG_ON(monc->cur_mon < 0);
343
344 if (!monc->sub_renew_sent)
345 monc->sub_renew_sent = jiffies | 1; /* never 0 */
346
347 msg->hdr.version = cpu_to_le16(2);
348
349 for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
350 if (monc->subs[i].want)
351 num++;
352 }
353 BUG_ON(num < 1); /* monmap sub is always there */
354 ceph_encode_32(&p, num);
355 for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
356 char buf[32];
357 int len;
358
359 if (!monc->subs[i].want)
360 continue;
361
362 len = sprintf(buf, "%s", ceph_sub_str[i]);
363 if (i == CEPH_SUB_MDSMAP &&
364 monc->fs_cluster_id != CEPH_FS_CLUSTER_ID_NONE)
365 len += sprintf(buf + len, ".%d", monc->fs_cluster_id);
366
367 dout("%s %s start %llu flags 0x%x\n", __func__, buf,
368 le64_to_cpu(monc->subs[i].item.start),
369 monc->subs[i].item.flags);
370 ceph_encode_string(&p, end, buf, len);
371 memcpy(p, &monc->subs[i].item, sizeof(monc->subs[i].item));
372 p += sizeof(monc->subs[i].item);
373 }
374
375 BUG_ON(p > end);
376 msg->front.iov_len = p - msg->front.iov_base;
377 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
378 ceph_msg_revoke(msg);
379 ceph_con_send(&monc->con, ceph_msg_get(msg));
380}
381
382static void handle_subscribe_ack(struct ceph_mon_client *monc,
383 struct ceph_msg *msg)
384{
385 unsigned int seconds;
386 struct ceph_mon_subscribe_ack *h = msg->front.iov_base;
387
388 if (msg->front.iov_len < sizeof(*h))
389 goto bad;
390 seconds = le32_to_cpu(h->duration);
391
392 mutex_lock(&monc->mutex);
393 if (monc->sub_renew_sent) {
394 /*
395 * This is only needed for legacy (infernalis or older)
396 * MONs -- see delayed_work().
397 */
398 monc->sub_renew_after = monc->sub_renew_sent +
399 (seconds >> 1) * HZ - 1;
400 dout("%s sent %lu duration %d renew after %lu\n", __func__,
401 monc->sub_renew_sent, seconds, monc->sub_renew_after);
402 monc->sub_renew_sent = 0;
403 } else {
404 dout("%s sent %lu renew after %lu, ignoring\n", __func__,
405 monc->sub_renew_sent, monc->sub_renew_after);
406 }
407 mutex_unlock(&monc->mutex);
408 return;
409bad:
410 pr_err("got corrupt subscribe-ack msg\n");
411 ceph_msg_dump(msg);
412}
413
414/*
415 * Register interest in a map
416 *
417 * @sub: one of CEPH_SUB_*
418 * @epoch: X for "every map since X", or 0 for "just the latest"
419 */
420static bool __ceph_monc_want_map(struct ceph_mon_client *monc, int sub,
421 u32 epoch, bool continuous)
422{
423 __le64 start = cpu_to_le64(epoch);
424 u8 flags = !continuous ? CEPH_SUBSCRIBE_ONETIME : 0;
425
426 dout("%s %s epoch %u continuous %d\n", __func__, ceph_sub_str[sub],
427 epoch, continuous);
428
429 if (monc->subs[sub].want &&
430 monc->subs[sub].item.start == start &&
431 monc->subs[sub].item.flags == flags)
432 return false;
433
434 monc->subs[sub].item.start = start;
435 monc->subs[sub].item.flags = flags;
436 monc->subs[sub].want = true;
437
438 return true;
439}
440
441bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
442 bool continuous)
443{
444 bool need_request;
445
446 mutex_lock(&monc->mutex);
447 need_request = __ceph_monc_want_map(monc, sub, epoch, continuous);
448 mutex_unlock(&monc->mutex);
449
450 return need_request;
451}
452EXPORT_SYMBOL(ceph_monc_want_map);
453
454/*
455 * Keep track of which maps we have
456 *
457 * @sub: one of CEPH_SUB_*
458 */
459static void __ceph_monc_got_map(struct ceph_mon_client *monc, int sub,
460 u32 epoch)
461{
462 dout("%s %s epoch %u\n", __func__, ceph_sub_str[sub], epoch);
463
464 if (monc->subs[sub].want) {
465 if (monc->subs[sub].item.flags & CEPH_SUBSCRIBE_ONETIME)
466 monc->subs[sub].want = false;
467 else
468 monc->subs[sub].item.start = cpu_to_le64(epoch + 1);
469 }
470
471 monc->subs[sub].have = epoch;
472}
473
474void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch)
475{
476 mutex_lock(&monc->mutex);
477 __ceph_monc_got_map(monc, sub, epoch);
478 mutex_unlock(&monc->mutex);
479}
480EXPORT_SYMBOL(ceph_monc_got_map);
481
482void ceph_monc_renew_subs(struct ceph_mon_client *monc)
483{
484 mutex_lock(&monc->mutex);
485 __send_subscribe(monc);
486 mutex_unlock(&monc->mutex);
487}
488EXPORT_SYMBOL(ceph_monc_renew_subs);
489
490/*
491 * Wait for an osdmap with a given epoch.
492 *
493 * @epoch: epoch to wait for
494 * @timeout: in jiffies, 0 means "wait forever"
495 */
496int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
497 unsigned long timeout)
498{
499 unsigned long started = jiffies;
500 long ret;
501
502 mutex_lock(&monc->mutex);
503 while (monc->subs[CEPH_SUB_OSDMAP].have < epoch) {
504 mutex_unlock(&monc->mutex);
505
506 if (timeout && time_after_eq(jiffies, started + timeout))
507 return -ETIMEDOUT;
508
509 ret = wait_event_interruptible_timeout(monc->client->auth_wq,
510 monc->subs[CEPH_SUB_OSDMAP].have >= epoch,
511 ceph_timeout_jiffies(timeout));
512 if (ret < 0)
513 return ret;
514
515 mutex_lock(&monc->mutex);
516 }
517
518 mutex_unlock(&monc->mutex);
519 return 0;
520}
521EXPORT_SYMBOL(ceph_monc_wait_osdmap);
522
523/*
524 * Open a session with a random monitor. Request monmap and osdmap,
525 * which are waited upon in __ceph_open_session().
526 */
527int ceph_monc_open_session(struct ceph_mon_client *monc)
528{
529 mutex_lock(&monc->mutex);
530 __ceph_monc_want_map(monc, CEPH_SUB_MONMAP, 0, true);
531 __ceph_monc_want_map(monc, CEPH_SUB_OSDMAP, 0, false);
532 __open_session(monc);
533 __schedule_delayed(monc);
534 mutex_unlock(&monc->mutex);
535 return 0;
536}
537EXPORT_SYMBOL(ceph_monc_open_session);
538
539static void ceph_monc_handle_map(struct ceph_mon_client *monc,
540 struct ceph_msg *msg)
541{
542 struct ceph_client *client = monc->client;
543 struct ceph_monmap *monmap;
544 void *p, *end;
545
546 mutex_lock(&monc->mutex);
547
548 dout("handle_monmap\n");
549 p = msg->front.iov_base;
550 end = p + msg->front.iov_len;
551
552 monmap = ceph_monmap_decode(&p, end, ceph_msgr2(client));
553 if (IS_ERR(monmap)) {
554 pr_err("problem decoding monmap, %d\n",
555 (int)PTR_ERR(monmap));
556 ceph_msg_dump(msg);
557 goto out;
558 }
559
560 if (ceph_check_fsid(client, &monmap->fsid) < 0) {
561 kfree(monmap);
562 goto out;
563 }
564
565 kfree(monc->monmap);
566 monc->monmap = monmap;
567
568 __ceph_monc_got_map(monc, CEPH_SUB_MONMAP, monc->monmap->epoch);
569 client->have_fsid = true;
570
571out:
572 mutex_unlock(&monc->mutex);
573 wake_up_all(&client->auth_wq);
574}
575
576/*
577 * generic requests (currently statfs, mon_get_version)
578 */
579DEFINE_RB_FUNCS(generic_request, struct ceph_mon_generic_request, tid, node)
580
581static void release_generic_request(struct kref *kref)
582{
583 struct ceph_mon_generic_request *req =
584 container_of(kref, struct ceph_mon_generic_request, kref);
585
586 dout("%s greq %p request %p reply %p\n", __func__, req, req->request,
587 req->reply);
588 WARN_ON(!RB_EMPTY_NODE(&req->node));
589
590 if (req->reply)
591 ceph_msg_put(req->reply);
592 if (req->request)
593 ceph_msg_put(req->request);
594
595 kfree(req);
596}
597
598static void put_generic_request(struct ceph_mon_generic_request *req)
599{
600 if (req)
601 kref_put(&req->kref, release_generic_request);
602}
603
604static void get_generic_request(struct ceph_mon_generic_request *req)
605{
606 kref_get(&req->kref);
607}
608
609static struct ceph_mon_generic_request *
610alloc_generic_request(struct ceph_mon_client *monc, gfp_t gfp)
611{
612 struct ceph_mon_generic_request *req;
613
614 req = kzalloc(sizeof(*req), gfp);
615 if (!req)
616 return NULL;
617
618 req->monc = monc;
619 kref_init(&req->kref);
620 RB_CLEAR_NODE(&req->node);
621 init_completion(&req->completion);
622
623 dout("%s greq %p\n", __func__, req);
624 return req;
625}
626
627static void register_generic_request(struct ceph_mon_generic_request *req)
628{
629 struct ceph_mon_client *monc = req->monc;
630
631 WARN_ON(req->tid);
632
633 get_generic_request(req);
634 req->tid = ++monc->last_tid;
635 insert_generic_request(&monc->generic_request_tree, req);
636}
637
638static void send_generic_request(struct ceph_mon_client *monc,
639 struct ceph_mon_generic_request *req)
640{
641 WARN_ON(!req->tid);
642
643 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
644 req->request->hdr.tid = cpu_to_le64(req->tid);
645 ceph_con_send(&monc->con, ceph_msg_get(req->request));
646}
647
648static void __finish_generic_request(struct ceph_mon_generic_request *req)
649{
650 struct ceph_mon_client *monc = req->monc;
651
652 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
653 erase_generic_request(&monc->generic_request_tree, req);
654
655 ceph_msg_revoke(req->request);
656 ceph_msg_revoke_incoming(req->reply);
657}
658
659static void finish_generic_request(struct ceph_mon_generic_request *req)
660{
661 __finish_generic_request(req);
662 put_generic_request(req);
663}
664
665static void complete_generic_request(struct ceph_mon_generic_request *req)
666{
667 if (req->complete_cb)
668 req->complete_cb(req);
669 else
670 complete_all(&req->completion);
671 put_generic_request(req);
672}
673
674static void cancel_generic_request(struct ceph_mon_generic_request *req)
675{
676 struct ceph_mon_client *monc = req->monc;
677 struct ceph_mon_generic_request *lookup_req;
678
679 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
680
681 mutex_lock(&monc->mutex);
682 lookup_req = lookup_generic_request(&monc->generic_request_tree,
683 req->tid);
684 if (lookup_req) {
685 WARN_ON(lookup_req != req);
686 finish_generic_request(req);
687 }
688
689 mutex_unlock(&monc->mutex);
690}
691
692static int wait_generic_request(struct ceph_mon_generic_request *req)
693{
694 int ret;
695
696 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
697 ret = wait_for_completion_interruptible(&req->completion);
698 if (ret)
699 cancel_generic_request(req);
700 else
701 ret = req->result; /* completed */
702
703 return ret;
704}
705
706static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
707 struct ceph_msg_header *hdr,
708 int *skip)
709{
710 struct ceph_mon_client *monc = con->private;
711 struct ceph_mon_generic_request *req;
712 u64 tid = le64_to_cpu(hdr->tid);
713 struct ceph_msg *m;
714
715 mutex_lock(&monc->mutex);
716 req = lookup_generic_request(&monc->generic_request_tree, tid);
717 if (!req) {
718 dout("get_generic_reply %lld dne\n", tid);
719 *skip = 1;
720 m = NULL;
721 } else {
722 dout("get_generic_reply %lld got %p\n", tid, req->reply);
723 *skip = 0;
724 m = ceph_msg_get(req->reply);
725 /*
726 * we don't need to track the connection reading into
727 * this reply because we only have one open connection
728 * at a time, ever.
729 */
730 }
731 mutex_unlock(&monc->mutex);
732 return m;
733}
734
735/*
736 * statfs
737 */
738static void handle_statfs_reply(struct ceph_mon_client *monc,
739 struct ceph_msg *msg)
740{
741 struct ceph_mon_generic_request *req;
742 struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
743 u64 tid = le64_to_cpu(msg->hdr.tid);
744
745 dout("%s msg %p tid %llu\n", __func__, msg, tid);
746
747 if (msg->front.iov_len != sizeof(*reply))
748 goto bad;
749
750 mutex_lock(&monc->mutex);
751 req = lookup_generic_request(&monc->generic_request_tree, tid);
752 if (!req) {
753 mutex_unlock(&monc->mutex);
754 return;
755 }
756
757 req->result = 0;
758 *req->u.st = reply->st; /* struct */
759 __finish_generic_request(req);
760 mutex_unlock(&monc->mutex);
761
762 complete_generic_request(req);
763 return;
764
765bad:
766 pr_err("corrupt statfs reply, tid %llu\n", tid);
767 ceph_msg_dump(msg);
768}
769
770/*
771 * Do a synchronous statfs().
772 */
773int ceph_monc_do_statfs(struct ceph_mon_client *monc, u64 data_pool,
774 struct ceph_statfs *buf)
775{
776 struct ceph_mon_generic_request *req;
777 struct ceph_mon_statfs *h;
778 int ret = -ENOMEM;
779
780 req = alloc_generic_request(monc, GFP_NOFS);
781 if (!req)
782 goto out;
783
784 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS,
785 true);
786 if (!req->request)
787 goto out;
788
789 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 64, GFP_NOFS, true);
790 if (!req->reply)
791 goto out;
792
793 req->u.st = buf;
794 req->request->hdr.version = cpu_to_le16(2);
795
796 mutex_lock(&monc->mutex);
797 register_generic_request(req);
798 /* fill out request */
799 h = req->request->front.iov_base;
800 h->monhdr.have_version = 0;
801 h->monhdr.session_mon = cpu_to_le16(-1);
802 h->monhdr.session_mon_tid = 0;
803 h->fsid = monc->monmap->fsid;
804 h->contains_data_pool = (data_pool != CEPH_NOPOOL);
805 h->data_pool = cpu_to_le64(data_pool);
806 send_generic_request(monc, req);
807 mutex_unlock(&monc->mutex);
808
809 ret = wait_generic_request(req);
810out:
811 put_generic_request(req);
812 return ret;
813}
814EXPORT_SYMBOL(ceph_monc_do_statfs);
815
816static void handle_get_version_reply(struct ceph_mon_client *monc,
817 struct ceph_msg *msg)
818{
819 struct ceph_mon_generic_request *req;
820 u64 tid = le64_to_cpu(msg->hdr.tid);
821 void *p = msg->front.iov_base;
822 void *end = p + msg->front_alloc_len;
823 u64 handle;
824
825 dout("%s msg %p tid %llu\n", __func__, msg, tid);
826
827 ceph_decode_need(&p, end, 2*sizeof(u64), bad);
828 handle = ceph_decode_64(&p);
829 if (tid != 0 && tid != handle)
830 goto bad;
831
832 mutex_lock(&monc->mutex);
833 req = lookup_generic_request(&monc->generic_request_tree, handle);
834 if (!req) {
835 mutex_unlock(&monc->mutex);
836 return;
837 }
838
839 req->result = 0;
840 req->u.newest = ceph_decode_64(&p);
841 __finish_generic_request(req);
842 mutex_unlock(&monc->mutex);
843
844 complete_generic_request(req);
845 return;
846
847bad:
848 pr_err("corrupt mon_get_version reply, tid %llu\n", tid);
849 ceph_msg_dump(msg);
850}
851
852static struct ceph_mon_generic_request *
853__ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
854 ceph_monc_callback_t cb, u64 private_data)
855{
856 struct ceph_mon_generic_request *req;
857
858 req = alloc_generic_request(monc, GFP_NOIO);
859 if (!req)
860 goto err_put_req;
861
862 req->request = ceph_msg_new(CEPH_MSG_MON_GET_VERSION,
863 sizeof(u64) + sizeof(u32) + strlen(what),
864 GFP_NOIO, true);
865 if (!req->request)
866 goto err_put_req;
867
868 req->reply = ceph_msg_new(CEPH_MSG_MON_GET_VERSION_REPLY, 32, GFP_NOIO,
869 true);
870 if (!req->reply)
871 goto err_put_req;
872
873 req->complete_cb = cb;
874 req->private_data = private_data;
875
876 mutex_lock(&monc->mutex);
877 register_generic_request(req);
878 {
879 void *p = req->request->front.iov_base;
880 void *const end = p + req->request->front_alloc_len;
881
882 ceph_encode_64(&p, req->tid); /* handle */
883 ceph_encode_string(&p, end, what, strlen(what));
884 WARN_ON(p != end);
885 }
886 send_generic_request(monc, req);
887 mutex_unlock(&monc->mutex);
888
889 return req;
890
891err_put_req:
892 put_generic_request(req);
893 return ERR_PTR(-ENOMEM);
894}
895
896/*
897 * Send MMonGetVersion and wait for the reply.
898 *
899 * @what: one of "mdsmap", "osdmap" or "monmap"
900 */
901int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
902 u64 *newest)
903{
904 struct ceph_mon_generic_request *req;
905 int ret;
906
907 req = __ceph_monc_get_version(monc, what, NULL, 0);
908 if (IS_ERR(req))
909 return PTR_ERR(req);
910
911 ret = wait_generic_request(req);
912 if (!ret)
913 *newest = req->u.newest;
914
915 put_generic_request(req);
916 return ret;
917}
918EXPORT_SYMBOL(ceph_monc_get_version);
919
920/*
921 * Send MMonGetVersion,
922 *
923 * @what: one of "mdsmap", "osdmap" or "monmap"
924 */
925int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
926 ceph_monc_callback_t cb, u64 private_data)
927{
928 struct ceph_mon_generic_request *req;
929
930 req = __ceph_monc_get_version(monc, what, cb, private_data);
931 if (IS_ERR(req))
932 return PTR_ERR(req);
933
934 put_generic_request(req);
935 return 0;
936}
937EXPORT_SYMBOL(ceph_monc_get_version_async);
938
939static void handle_command_ack(struct ceph_mon_client *monc,
940 struct ceph_msg *msg)
941{
942 struct ceph_mon_generic_request *req;
943 void *p = msg->front.iov_base;
944 void *const end = p + msg->front_alloc_len;
945 u64 tid = le64_to_cpu(msg->hdr.tid);
946
947 dout("%s msg %p tid %llu\n", __func__, msg, tid);
948
949 ceph_decode_need(&p, end, sizeof(struct ceph_mon_request_header) +
950 sizeof(u32), bad);
951 p += sizeof(struct ceph_mon_request_header);
952
953 mutex_lock(&monc->mutex);
954 req = lookup_generic_request(&monc->generic_request_tree, tid);
955 if (!req) {
956 mutex_unlock(&monc->mutex);
957 return;
958 }
959
960 req->result = ceph_decode_32(&p);
961 __finish_generic_request(req);
962 mutex_unlock(&monc->mutex);
963
964 complete_generic_request(req);
965 return;
966
967bad:
968 pr_err("corrupt mon_command ack, tid %llu\n", tid);
969 ceph_msg_dump(msg);
970}
971
972static __printf(2, 0)
973int do_mon_command_vargs(struct ceph_mon_client *monc, const char *fmt,
974 va_list ap)
975{
976 struct ceph_mon_generic_request *req;
977 struct ceph_mon_command *h;
978 int ret = -ENOMEM;
979 int len;
980
981 req = alloc_generic_request(monc, GFP_NOIO);
982 if (!req)
983 goto out;
984
985 req->request = ceph_msg_new(CEPH_MSG_MON_COMMAND, 256, GFP_NOIO, true);
986 if (!req->request)
987 goto out;
988
989 req->reply = ceph_msg_new(CEPH_MSG_MON_COMMAND_ACK, 512, GFP_NOIO,
990 true);
991 if (!req->reply)
992 goto out;
993
994 mutex_lock(&monc->mutex);
995 register_generic_request(req);
996 h = req->request->front.iov_base;
997 h->monhdr.have_version = 0;
998 h->monhdr.session_mon = cpu_to_le16(-1);
999 h->monhdr.session_mon_tid = 0;
1000 h->fsid = monc->monmap->fsid;
1001 h->num_strs = cpu_to_le32(1);
1002 len = vsprintf(h->str, fmt, ap);
1003 h->str_len = cpu_to_le32(len);
1004 send_generic_request(monc, req);
1005 mutex_unlock(&monc->mutex);
1006
1007 ret = wait_generic_request(req);
1008out:
1009 put_generic_request(req);
1010 return ret;
1011}
1012
1013static __printf(2, 3)
1014int do_mon_command(struct ceph_mon_client *monc, const char *fmt, ...)
1015{
1016 va_list ap;
1017 int ret;
1018
1019 va_start(ap, fmt);
1020 ret = do_mon_command_vargs(monc, fmt, ap);
1021 va_end(ap);
1022 return ret;
1023}
1024
1025int ceph_monc_blocklist_add(struct ceph_mon_client *monc,
1026 struct ceph_entity_addr *client_addr)
1027{
1028 int ret;
1029
1030 ret = do_mon_command(monc,
1031 "{ \"prefix\": \"osd blocklist\", \
1032 \"blocklistop\": \"add\", \
1033 \"addr\": \"%pISpc/%u\" }",
1034 &client_addr->in_addr,
1035 le32_to_cpu(client_addr->nonce));
1036 if (ret == -EINVAL) {
1037 /*
1038 * The monitor returns EINVAL on an unrecognized command.
1039 * Try the legacy command -- it is exactly the same except
1040 * for the name.
1041 */
1042 ret = do_mon_command(monc,
1043 "{ \"prefix\": \"osd blacklist\", \
1044 \"blacklistop\": \"add\", \
1045 \"addr\": \"%pISpc/%u\" }",
1046 &client_addr->in_addr,
1047 le32_to_cpu(client_addr->nonce));
1048 }
1049 if (ret)
1050 return ret;
1051
1052 /*
1053 * Make sure we have the osdmap that includes the blocklist
1054 * entry. This is needed to ensure that the OSDs pick up the
1055 * new blocklist before processing any future requests from
1056 * this client.
1057 */
1058 return ceph_wait_for_latest_osdmap(monc->client, 0);
1059}
1060EXPORT_SYMBOL(ceph_monc_blocklist_add);
1061
1062/*
1063 * Resend pending generic requests.
1064 */
1065static void __resend_generic_request(struct ceph_mon_client *monc)
1066{
1067 struct ceph_mon_generic_request *req;
1068 struct rb_node *p;
1069
1070 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
1071 req = rb_entry(p, struct ceph_mon_generic_request, node);
1072 ceph_msg_revoke(req->request);
1073 ceph_msg_revoke_incoming(req->reply);
1074 ceph_con_send(&monc->con, ceph_msg_get(req->request));
1075 }
1076}
1077
1078/*
1079 * Delayed work. If we haven't mounted yet, retry. Otherwise,
1080 * renew/retry subscription as needed (in case it is timing out, or we
1081 * got an ENOMEM). And keep the monitor connection alive.
1082 */
1083static void delayed_work(struct work_struct *work)
1084{
1085 struct ceph_mon_client *monc =
1086 container_of(work, struct ceph_mon_client, delayed_work.work);
1087
1088 dout("monc delayed_work\n");
1089 mutex_lock(&monc->mutex);
1090 if (monc->hunting) {
1091 dout("%s continuing hunt\n", __func__);
1092 reopen_session(monc);
1093 } else {
1094 int is_auth = ceph_auth_is_authenticated(monc->auth);
1095 if (ceph_con_keepalive_expired(&monc->con,
1096 CEPH_MONC_PING_TIMEOUT)) {
1097 dout("monc keepalive timeout\n");
1098 is_auth = 0;
1099 reopen_session(monc);
1100 }
1101
1102 if (!monc->hunting) {
1103 ceph_con_keepalive(&monc->con);
1104 __validate_auth(monc);
1105 un_backoff(monc);
1106 }
1107
1108 if (is_auth &&
1109 !(monc->con.peer_features & CEPH_FEATURE_MON_STATEFUL_SUB)) {
1110 unsigned long now = jiffies;
1111
1112 dout("%s renew subs? now %lu renew after %lu\n",
1113 __func__, now, monc->sub_renew_after);
1114 if (time_after_eq(now, monc->sub_renew_after))
1115 __send_subscribe(monc);
1116 }
1117 }
1118 __schedule_delayed(monc);
1119 mutex_unlock(&monc->mutex);
1120}
1121
1122/*
1123 * On startup, we build a temporary monmap populated with the IPs
1124 * provided by mount(2).
1125 */
1126static int build_initial_monmap(struct ceph_mon_client *monc)
1127{
1128 __le32 my_type = ceph_msgr2(monc->client) ?
1129 CEPH_ENTITY_ADDR_TYPE_MSGR2 : CEPH_ENTITY_ADDR_TYPE_LEGACY;
1130 struct ceph_options *opt = monc->client->options;
1131 int num_mon = opt->num_mon;
1132 int i;
1133
1134 /* build initial monmap */
1135 monc->monmap = kzalloc(struct_size(monc->monmap, mon_inst, num_mon),
1136 GFP_KERNEL);
1137 if (!monc->monmap)
1138 return -ENOMEM;
1139
1140 for (i = 0; i < num_mon; i++) {
1141 struct ceph_entity_inst *inst = &monc->monmap->mon_inst[i];
1142
1143 memcpy(&inst->addr.in_addr, &opt->mon_addr[i].in_addr,
1144 sizeof(inst->addr.in_addr));
1145 inst->addr.type = my_type;
1146 inst->addr.nonce = 0;
1147 inst->name.type = CEPH_ENTITY_TYPE_MON;
1148 inst->name.num = cpu_to_le64(i);
1149 }
1150 monc->monmap->num_mon = num_mon;
1151 return 0;
1152}
1153
1154int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
1155{
1156 int err;
1157
1158 dout("init\n");
1159 memset(monc, 0, sizeof(*monc));
1160 monc->client = cl;
1161 mutex_init(&monc->mutex);
1162
1163 err = build_initial_monmap(monc);
1164 if (err)
1165 goto out;
1166
1167 /* connection */
1168 /* authentication */
1169 monc->auth = ceph_auth_init(cl->options->name, cl->options->key,
1170 cl->options->con_modes);
1171 if (IS_ERR(monc->auth)) {
1172 err = PTR_ERR(monc->auth);
1173 goto out_monmap;
1174 }
1175 monc->auth->want_keys =
1176 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
1177 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
1178
1179 /* msgs */
1180 err = -ENOMEM;
1181 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
1182 sizeof(struct ceph_mon_subscribe_ack),
1183 GFP_KERNEL, true);
1184 if (!monc->m_subscribe_ack)
1185 goto out_auth;
1186
1187 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 128,
1188 GFP_KERNEL, true);
1189 if (!monc->m_subscribe)
1190 goto out_subscribe_ack;
1191
1192 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096,
1193 GFP_KERNEL, true);
1194 if (!monc->m_auth_reply)
1195 goto out_subscribe;
1196
1197 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_KERNEL, true);
1198 monc->pending_auth = 0;
1199 if (!monc->m_auth)
1200 goto out_auth_reply;
1201
1202 ceph_con_init(&monc->con, monc, &mon_con_ops,
1203 &monc->client->msgr);
1204
1205 monc->cur_mon = -1;
1206 monc->had_a_connection = false;
1207 monc->hunt_mult = 1;
1208
1209 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
1210 monc->generic_request_tree = RB_ROOT;
1211 monc->last_tid = 0;
1212
1213 monc->fs_cluster_id = CEPH_FS_CLUSTER_ID_NONE;
1214
1215 return 0;
1216
1217out_auth_reply:
1218 ceph_msg_put(monc->m_auth_reply);
1219out_subscribe:
1220 ceph_msg_put(monc->m_subscribe);
1221out_subscribe_ack:
1222 ceph_msg_put(monc->m_subscribe_ack);
1223out_auth:
1224 ceph_auth_destroy(monc->auth);
1225out_monmap:
1226 kfree(monc->monmap);
1227out:
1228 return err;
1229}
1230EXPORT_SYMBOL(ceph_monc_init);
1231
1232void ceph_monc_stop(struct ceph_mon_client *monc)
1233{
1234 dout("stop\n");
1235 cancel_delayed_work_sync(&monc->delayed_work);
1236
1237 mutex_lock(&monc->mutex);
1238 __close_session(monc);
1239 monc->cur_mon = -1;
1240 mutex_unlock(&monc->mutex);
1241
1242 /*
1243 * flush msgr queue before we destroy ourselves to ensure that:
1244 * - any work that references our embedded con is finished.
1245 * - any osd_client or other work that may reference an authorizer
1246 * finishes before we shut down the auth subsystem.
1247 */
1248 ceph_msgr_flush();
1249
1250 ceph_auth_destroy(monc->auth);
1251
1252 WARN_ON(!RB_EMPTY_ROOT(&monc->generic_request_tree));
1253
1254 ceph_msg_put(monc->m_auth);
1255 ceph_msg_put(monc->m_auth_reply);
1256 ceph_msg_put(monc->m_subscribe);
1257 ceph_msg_put(monc->m_subscribe_ack);
1258
1259 kfree(monc->monmap);
1260}
1261EXPORT_SYMBOL(ceph_monc_stop);
1262
1263static void finish_hunting(struct ceph_mon_client *monc)
1264{
1265 if (monc->hunting) {
1266 dout("%s found mon%d\n", __func__, monc->cur_mon);
1267 monc->hunting = false;
1268 monc->had_a_connection = true;
1269 un_backoff(monc);
1270 __schedule_delayed(monc);
1271 }
1272}
1273
1274static void finish_auth(struct ceph_mon_client *monc, int auth_err,
1275 bool was_authed)
1276{
1277 dout("%s auth_err %d was_authed %d\n", __func__, auth_err, was_authed);
1278 WARN_ON(auth_err > 0);
1279
1280 monc->pending_auth = 0;
1281 if (auth_err) {
1282 monc->client->auth_err = auth_err;
1283 wake_up_all(&monc->client->auth_wq);
1284 return;
1285 }
1286
1287 if (!was_authed && ceph_auth_is_authenticated(monc->auth)) {
1288 dout("%s authenticated, starting session global_id %llu\n",
1289 __func__, monc->auth->global_id);
1290
1291 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
1292 monc->client->msgr.inst.name.num =
1293 cpu_to_le64(monc->auth->global_id);
1294
1295 __send_subscribe(monc);
1296 __resend_generic_request(monc);
1297
1298 pr_info("mon%d %s session established\n", monc->cur_mon,
1299 ceph_pr_addr(&monc->con.peer_addr));
1300 }
1301}
1302
1303static void handle_auth_reply(struct ceph_mon_client *monc,
1304 struct ceph_msg *msg)
1305{
1306 bool was_authed;
1307 int ret;
1308
1309 mutex_lock(&monc->mutex);
1310 was_authed = ceph_auth_is_authenticated(monc->auth);
1311 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
1312 msg->front.iov_len,
1313 monc->m_auth->front.iov_base,
1314 monc->m_auth->front_alloc_len);
1315 if (ret > 0) {
1316 __send_prepared_auth_request(monc, ret);
1317 } else {
1318 finish_auth(monc, ret, was_authed);
1319 finish_hunting(monc);
1320 }
1321 mutex_unlock(&monc->mutex);
1322}
1323
1324static int __validate_auth(struct ceph_mon_client *monc)
1325{
1326 int ret;
1327
1328 if (monc->pending_auth)
1329 return 0;
1330
1331 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
1332 monc->m_auth->front_alloc_len);
1333 if (ret <= 0)
1334 return ret; /* either an error, or no need to authenticate */
1335 __send_prepared_auth_request(monc, ret);
1336 return 0;
1337}
1338
1339int ceph_monc_validate_auth(struct ceph_mon_client *monc)
1340{
1341 int ret;
1342
1343 mutex_lock(&monc->mutex);
1344 ret = __validate_auth(monc);
1345 mutex_unlock(&monc->mutex);
1346 return ret;
1347}
1348EXPORT_SYMBOL(ceph_monc_validate_auth);
1349
1350static int mon_get_auth_request(struct ceph_connection *con,
1351 void *buf, int *buf_len,
1352 void **authorizer, int *authorizer_len)
1353{
1354 struct ceph_mon_client *monc = con->private;
1355 int ret;
1356
1357 mutex_lock(&monc->mutex);
1358 ret = ceph_auth_get_request(monc->auth, buf, *buf_len);
1359 mutex_unlock(&monc->mutex);
1360 if (ret < 0)
1361 return ret;
1362
1363 *buf_len = ret;
1364 *authorizer = NULL;
1365 *authorizer_len = 0;
1366 return 0;
1367}
1368
1369static int mon_handle_auth_reply_more(struct ceph_connection *con,
1370 void *reply, int reply_len,
1371 void *buf, int *buf_len,
1372 void **authorizer, int *authorizer_len)
1373{
1374 struct ceph_mon_client *monc = con->private;
1375 int ret;
1376
1377 mutex_lock(&monc->mutex);
1378 ret = ceph_auth_handle_reply_more(monc->auth, reply, reply_len,
1379 buf, *buf_len);
1380 mutex_unlock(&monc->mutex);
1381 if (ret < 0)
1382 return ret;
1383
1384 *buf_len = ret;
1385 *authorizer = NULL;
1386 *authorizer_len = 0;
1387 return 0;
1388}
1389
1390static int mon_handle_auth_done(struct ceph_connection *con,
1391 u64 global_id, void *reply, int reply_len,
1392 u8 *session_key, int *session_key_len,
1393 u8 *con_secret, int *con_secret_len)
1394{
1395 struct ceph_mon_client *monc = con->private;
1396 bool was_authed;
1397 int ret;
1398
1399 mutex_lock(&monc->mutex);
1400 WARN_ON(!monc->hunting);
1401 was_authed = ceph_auth_is_authenticated(monc->auth);
1402 ret = ceph_auth_handle_reply_done(monc->auth, global_id,
1403 reply, reply_len,
1404 session_key, session_key_len,
1405 con_secret, con_secret_len);
1406 finish_auth(monc, ret, was_authed);
1407 if (!ret)
1408 finish_hunting(monc);
1409 mutex_unlock(&monc->mutex);
1410 return 0;
1411}
1412
1413static int mon_handle_auth_bad_method(struct ceph_connection *con,
1414 int used_proto, int result,
1415 const int *allowed_protos, int proto_cnt,
1416 const int *allowed_modes, int mode_cnt)
1417{
1418 struct ceph_mon_client *monc = con->private;
1419 bool was_authed;
1420
1421 mutex_lock(&monc->mutex);
1422 WARN_ON(!monc->hunting);
1423 was_authed = ceph_auth_is_authenticated(monc->auth);
1424 ceph_auth_handle_bad_method(monc->auth, used_proto, result,
1425 allowed_protos, proto_cnt,
1426 allowed_modes, mode_cnt);
1427 finish_auth(monc, -EACCES, was_authed);
1428 mutex_unlock(&monc->mutex);
1429 return 0;
1430}
1431
1432/*
1433 * handle incoming message
1434 */
1435static void mon_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1436{
1437 struct ceph_mon_client *monc = con->private;
1438 int type = le16_to_cpu(msg->hdr.type);
1439
1440 switch (type) {
1441 case CEPH_MSG_AUTH_REPLY:
1442 handle_auth_reply(monc, msg);
1443 break;
1444
1445 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1446 handle_subscribe_ack(monc, msg);
1447 break;
1448
1449 case CEPH_MSG_STATFS_REPLY:
1450 handle_statfs_reply(monc, msg);
1451 break;
1452
1453 case CEPH_MSG_MON_GET_VERSION_REPLY:
1454 handle_get_version_reply(monc, msg);
1455 break;
1456
1457 case CEPH_MSG_MON_COMMAND_ACK:
1458 handle_command_ack(monc, msg);
1459 break;
1460
1461 case CEPH_MSG_MON_MAP:
1462 ceph_monc_handle_map(monc, msg);
1463 break;
1464
1465 case CEPH_MSG_OSD_MAP:
1466 ceph_osdc_handle_map(&monc->client->osdc, msg);
1467 break;
1468
1469 default:
1470 /* can the chained handler handle it? */
1471 if (monc->client->extra_mon_dispatch &&
1472 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1473 break;
1474
1475 pr_err("received unknown message type %d %s\n", type,
1476 ceph_msg_type_name(type));
1477 }
1478 ceph_msg_put(msg);
1479}
1480
1481/*
1482 * Allocate memory for incoming message
1483 */
1484static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1485 struct ceph_msg_header *hdr,
1486 int *skip)
1487{
1488 struct ceph_mon_client *monc = con->private;
1489 int type = le16_to_cpu(hdr->type);
1490 int front_len = le32_to_cpu(hdr->front_len);
1491 struct ceph_msg *m = NULL;
1492
1493 *skip = 0;
1494
1495 switch (type) {
1496 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1497 m = ceph_msg_get(monc->m_subscribe_ack);
1498 break;
1499 case CEPH_MSG_STATFS_REPLY:
1500 case CEPH_MSG_MON_COMMAND_ACK:
1501 return get_generic_reply(con, hdr, skip);
1502 case CEPH_MSG_AUTH_REPLY:
1503 m = ceph_msg_get(monc->m_auth_reply);
1504 break;
1505 case CEPH_MSG_MON_GET_VERSION_REPLY:
1506 if (le64_to_cpu(hdr->tid) != 0)
1507 return get_generic_reply(con, hdr, skip);
1508
1509 /*
1510 * Older OSDs don't set reply tid even if the original
1511 * request had a non-zero tid. Work around this weirdness
1512 * by allocating a new message.
1513 */
1514 fallthrough;
1515 case CEPH_MSG_MON_MAP:
1516 case CEPH_MSG_MDS_MAP:
1517 case CEPH_MSG_OSD_MAP:
1518 case CEPH_MSG_FS_MAP_USER:
1519 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1520 if (!m)
1521 return NULL; /* ENOMEM--return skip == 0 */
1522 break;
1523 }
1524
1525 if (!m) {
1526 pr_info("alloc_msg unknown type %d\n", type);
1527 *skip = 1;
1528 } else if (front_len > m->front_alloc_len) {
1529 pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
1530 front_len, m->front_alloc_len,
1531 (unsigned int)con->peer_name.type,
1532 le64_to_cpu(con->peer_name.num));
1533 ceph_msg_put(m);
1534 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1535 }
1536
1537 return m;
1538}
1539
1540/*
1541 * If the monitor connection resets, pick a new monitor and resubmit
1542 * any pending requests.
1543 */
1544static void mon_fault(struct ceph_connection *con)
1545{
1546 struct ceph_mon_client *monc = con->private;
1547
1548 mutex_lock(&monc->mutex);
1549 dout("%s mon%d\n", __func__, monc->cur_mon);
1550 if (monc->cur_mon >= 0) {
1551 if (!monc->hunting) {
1552 dout("%s hunting for new mon\n", __func__);
1553 reopen_session(monc);
1554 __schedule_delayed(monc);
1555 } else {
1556 dout("%s already hunting\n", __func__);
1557 }
1558 }
1559 mutex_unlock(&monc->mutex);
1560}
1561
1562/*
1563 * We can ignore refcounting on the connection struct, as all references
1564 * will come from the messenger workqueue, which is drained prior to
1565 * mon_client destruction.
1566 */
1567static struct ceph_connection *mon_get_con(struct ceph_connection *con)
1568{
1569 return con;
1570}
1571
1572static void mon_put_con(struct ceph_connection *con)
1573{
1574}
1575
1576static const struct ceph_connection_operations mon_con_ops = {
1577 .get = mon_get_con,
1578 .put = mon_put_con,
1579 .alloc_msg = mon_alloc_msg,
1580 .dispatch = mon_dispatch,
1581 .fault = mon_fault,
1582 .get_auth_request = mon_get_auth_request,
1583 .handle_auth_reply_more = mon_handle_auth_reply_more,
1584 .handle_auth_done = mon_handle_auth_done,
1585 .handle_auth_bad_method = mon_handle_auth_bad_method,
1586};
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
33static const struct ceph_connection_operations mon_con_ops;
34
35static int __validate_auth(struct ceph_mon_client *monc);
36
37/*
38 * Decode a monmap blob (e.g., during mount).
39 */
40struct 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
82bad:
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 */
91int 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 */
104static 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 */
117static 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 */
134static 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 */
168static 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
202static 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 */
215static 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
229const char *ceph_sub_str[] = {
230 [CEPH_SUB_MDSMAP] = "mdsmap",
231 [CEPH_SUB_MONMAP] = "monmap",
232 [CEPH_SUB_OSDMAP] = "osdmap",
233};
234
235/*
236 * Send subscribe request for one or more maps, according to
237 * monc->subs.
238 */
239static void __send_subscribe(struct ceph_mon_client *monc)
240{
241 struct ceph_msg *msg = monc->m_subscribe;
242 void *p = msg->front.iov_base;
243 void *const end = p + msg->front_alloc_len;
244 int num = 0;
245 int i;
246
247 dout("%s sent %lu\n", __func__, monc->sub_renew_sent);
248
249 BUG_ON(monc->cur_mon < 0);
250
251 if (!monc->sub_renew_sent)
252 monc->sub_renew_sent = jiffies | 1; /* never 0 */
253
254 msg->hdr.version = cpu_to_le16(2);
255
256 for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
257 if (monc->subs[i].want)
258 num++;
259 }
260 BUG_ON(num < 1); /* monmap sub is always there */
261 ceph_encode_32(&p, num);
262 for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
263 const char *s = ceph_sub_str[i];
264
265 if (!monc->subs[i].want)
266 continue;
267
268 dout("%s %s start %llu flags 0x%x\n", __func__, s,
269 le64_to_cpu(monc->subs[i].item.start),
270 monc->subs[i].item.flags);
271 ceph_encode_string(&p, end, s, strlen(s));
272 memcpy(p, &monc->subs[i].item, sizeof(monc->subs[i].item));
273 p += sizeof(monc->subs[i].item);
274 }
275
276 BUG_ON(p != (end - 35 - (ARRAY_SIZE(monc->subs) - num) * 19));
277 msg->front.iov_len = p - msg->front.iov_base;
278 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
279 ceph_msg_revoke(msg);
280 ceph_con_send(&monc->con, ceph_msg_get(msg));
281}
282
283static void handle_subscribe_ack(struct ceph_mon_client *monc,
284 struct ceph_msg *msg)
285{
286 unsigned int seconds;
287 struct ceph_mon_subscribe_ack *h = msg->front.iov_base;
288
289 if (msg->front.iov_len < sizeof(*h))
290 goto bad;
291 seconds = le32_to_cpu(h->duration);
292
293 mutex_lock(&monc->mutex);
294 if (monc->sub_renew_sent) {
295 monc->sub_renew_after = monc->sub_renew_sent +
296 (seconds >> 1) * HZ - 1;
297 dout("%s sent %lu duration %d renew after %lu\n", __func__,
298 monc->sub_renew_sent, seconds, monc->sub_renew_after);
299 monc->sub_renew_sent = 0;
300 } else {
301 dout("%s sent %lu renew after %lu, ignoring\n", __func__,
302 monc->sub_renew_sent, monc->sub_renew_after);
303 }
304 mutex_unlock(&monc->mutex);
305 return;
306bad:
307 pr_err("got corrupt subscribe-ack msg\n");
308 ceph_msg_dump(msg);
309}
310
311/*
312 * Register interest in a map
313 *
314 * @sub: one of CEPH_SUB_*
315 * @epoch: X for "every map since X", or 0 for "just the latest"
316 */
317static bool __ceph_monc_want_map(struct ceph_mon_client *monc, int sub,
318 u32 epoch, bool continuous)
319{
320 __le64 start = cpu_to_le64(epoch);
321 u8 flags = !continuous ? CEPH_SUBSCRIBE_ONETIME : 0;
322
323 dout("%s %s epoch %u continuous %d\n", __func__, ceph_sub_str[sub],
324 epoch, continuous);
325
326 if (monc->subs[sub].want &&
327 monc->subs[sub].item.start == start &&
328 monc->subs[sub].item.flags == flags)
329 return false;
330
331 monc->subs[sub].item.start = start;
332 monc->subs[sub].item.flags = flags;
333 monc->subs[sub].want = true;
334
335 return true;
336}
337
338bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
339 bool continuous)
340{
341 bool need_request;
342
343 mutex_lock(&monc->mutex);
344 need_request = __ceph_monc_want_map(monc, sub, epoch, continuous);
345 mutex_unlock(&monc->mutex);
346
347 return need_request;
348}
349EXPORT_SYMBOL(ceph_monc_want_map);
350
351/*
352 * Keep track of which maps we have
353 *
354 * @sub: one of CEPH_SUB_*
355 */
356static void __ceph_monc_got_map(struct ceph_mon_client *monc, int sub,
357 u32 epoch)
358{
359 dout("%s %s epoch %u\n", __func__, ceph_sub_str[sub], epoch);
360
361 if (monc->subs[sub].want) {
362 if (monc->subs[sub].item.flags & CEPH_SUBSCRIBE_ONETIME)
363 monc->subs[sub].want = false;
364 else
365 monc->subs[sub].item.start = cpu_to_le64(epoch + 1);
366 }
367
368 monc->subs[sub].have = epoch;
369}
370
371void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch)
372{
373 mutex_lock(&monc->mutex);
374 __ceph_monc_got_map(monc, sub, epoch);
375 mutex_unlock(&monc->mutex);
376}
377EXPORT_SYMBOL(ceph_monc_got_map);
378
379/*
380 * Register interest in the next osdmap
381 */
382void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc)
383{
384 dout("%s have %u\n", __func__, monc->subs[CEPH_SUB_OSDMAP].have);
385 mutex_lock(&monc->mutex);
386 if (__ceph_monc_want_map(monc, CEPH_SUB_OSDMAP,
387 monc->subs[CEPH_SUB_OSDMAP].have + 1, false))
388 __send_subscribe(monc);
389 mutex_unlock(&monc->mutex);
390}
391EXPORT_SYMBOL(ceph_monc_request_next_osdmap);
392
393/*
394 * Wait for an osdmap with a given epoch.
395 *
396 * @epoch: epoch to wait for
397 * @timeout: in jiffies, 0 means "wait forever"
398 */
399int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
400 unsigned long timeout)
401{
402 unsigned long started = jiffies;
403 long ret;
404
405 mutex_lock(&monc->mutex);
406 while (monc->subs[CEPH_SUB_OSDMAP].have < epoch) {
407 mutex_unlock(&monc->mutex);
408
409 if (timeout && time_after_eq(jiffies, started + timeout))
410 return -ETIMEDOUT;
411
412 ret = wait_event_interruptible_timeout(monc->client->auth_wq,
413 monc->subs[CEPH_SUB_OSDMAP].have >= epoch,
414 ceph_timeout_jiffies(timeout));
415 if (ret < 0)
416 return ret;
417
418 mutex_lock(&monc->mutex);
419 }
420
421 mutex_unlock(&monc->mutex);
422 return 0;
423}
424EXPORT_SYMBOL(ceph_monc_wait_osdmap);
425
426/*
427 * Open a session with a random monitor. Request monmap and osdmap,
428 * which are waited upon in __ceph_open_session().
429 */
430int ceph_monc_open_session(struct ceph_mon_client *monc)
431{
432 mutex_lock(&monc->mutex);
433 __ceph_monc_want_map(monc, CEPH_SUB_MONMAP, 0, true);
434 __ceph_monc_want_map(monc, CEPH_SUB_OSDMAP, 0, false);
435 __open_session(monc);
436 __schedule_delayed(monc);
437 mutex_unlock(&monc->mutex);
438 return 0;
439}
440EXPORT_SYMBOL(ceph_monc_open_session);
441
442static void ceph_monc_handle_map(struct ceph_mon_client *monc,
443 struct ceph_msg *msg)
444{
445 struct ceph_client *client = monc->client;
446 struct ceph_monmap *monmap = NULL, *old = monc->monmap;
447 void *p, *end;
448
449 mutex_lock(&monc->mutex);
450
451 dout("handle_monmap\n");
452 p = msg->front.iov_base;
453 end = p + msg->front.iov_len;
454
455 monmap = ceph_monmap_decode(p, end);
456 if (IS_ERR(monmap)) {
457 pr_err("problem decoding monmap, %d\n",
458 (int)PTR_ERR(monmap));
459 goto out;
460 }
461
462 if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) {
463 kfree(monmap);
464 goto out;
465 }
466
467 client->monc.monmap = monmap;
468 kfree(old);
469
470 __ceph_monc_got_map(monc, CEPH_SUB_MONMAP, monc->monmap->epoch);
471 client->have_fsid = true;
472
473out:
474 mutex_unlock(&monc->mutex);
475 wake_up_all(&client->auth_wq);
476}
477
478/*
479 * generic requests (currently statfs, mon_get_version)
480 */
481static struct ceph_mon_generic_request *__lookup_generic_req(
482 struct ceph_mon_client *monc, u64 tid)
483{
484 struct ceph_mon_generic_request *req;
485 struct rb_node *n = monc->generic_request_tree.rb_node;
486
487 while (n) {
488 req = rb_entry(n, struct ceph_mon_generic_request, node);
489 if (tid < req->tid)
490 n = n->rb_left;
491 else if (tid > req->tid)
492 n = n->rb_right;
493 else
494 return req;
495 }
496 return NULL;
497}
498
499static void __insert_generic_request(struct ceph_mon_client *monc,
500 struct ceph_mon_generic_request *new)
501{
502 struct rb_node **p = &monc->generic_request_tree.rb_node;
503 struct rb_node *parent = NULL;
504 struct ceph_mon_generic_request *req = NULL;
505
506 while (*p) {
507 parent = *p;
508 req = rb_entry(parent, struct ceph_mon_generic_request, node);
509 if (new->tid < req->tid)
510 p = &(*p)->rb_left;
511 else if (new->tid > req->tid)
512 p = &(*p)->rb_right;
513 else
514 BUG();
515 }
516
517 rb_link_node(&new->node, parent, p);
518 rb_insert_color(&new->node, &monc->generic_request_tree);
519}
520
521static void release_generic_request(struct kref *kref)
522{
523 struct ceph_mon_generic_request *req =
524 container_of(kref, struct ceph_mon_generic_request, kref);
525
526 if (req->reply)
527 ceph_msg_put(req->reply);
528 if (req->request)
529 ceph_msg_put(req->request);
530
531 kfree(req);
532}
533
534static void put_generic_request(struct ceph_mon_generic_request *req)
535{
536 kref_put(&req->kref, release_generic_request);
537}
538
539static void get_generic_request(struct ceph_mon_generic_request *req)
540{
541 kref_get(&req->kref);
542}
543
544static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
545 struct ceph_msg_header *hdr,
546 int *skip)
547{
548 struct ceph_mon_client *monc = con->private;
549 struct ceph_mon_generic_request *req;
550 u64 tid = le64_to_cpu(hdr->tid);
551 struct ceph_msg *m;
552
553 mutex_lock(&monc->mutex);
554 req = __lookup_generic_req(monc, tid);
555 if (!req) {
556 dout("get_generic_reply %lld dne\n", tid);
557 *skip = 1;
558 m = NULL;
559 } else {
560 dout("get_generic_reply %lld got %p\n", tid, req->reply);
561 *skip = 0;
562 m = ceph_msg_get(req->reply);
563 /*
564 * we don't need to track the connection reading into
565 * this reply because we only have one open connection
566 * at a time, ever.
567 */
568 }
569 mutex_unlock(&monc->mutex);
570 return m;
571}
572
573static int __do_generic_request(struct ceph_mon_client *monc, u64 tid,
574 struct ceph_mon_generic_request *req)
575{
576 int err;
577
578 /* register request */
579 req->tid = tid != 0 ? tid : ++monc->last_tid;
580 req->request->hdr.tid = cpu_to_le64(req->tid);
581 __insert_generic_request(monc, req);
582 monc->num_generic_requests++;
583 ceph_con_send(&monc->con, ceph_msg_get(req->request));
584 mutex_unlock(&monc->mutex);
585
586 err = wait_for_completion_interruptible(&req->completion);
587
588 mutex_lock(&monc->mutex);
589 rb_erase(&req->node, &monc->generic_request_tree);
590 monc->num_generic_requests--;
591
592 if (!err)
593 err = req->result;
594 return err;
595}
596
597static int do_generic_request(struct ceph_mon_client *monc,
598 struct ceph_mon_generic_request *req)
599{
600 int err;
601
602 mutex_lock(&monc->mutex);
603 err = __do_generic_request(monc, 0, req);
604 mutex_unlock(&monc->mutex);
605
606 return err;
607}
608
609/*
610 * statfs
611 */
612static void handle_statfs_reply(struct ceph_mon_client *monc,
613 struct ceph_msg *msg)
614{
615 struct ceph_mon_generic_request *req;
616 struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
617 u64 tid = le64_to_cpu(msg->hdr.tid);
618
619 if (msg->front.iov_len != sizeof(*reply))
620 goto bad;
621 dout("handle_statfs_reply %p tid %llu\n", msg, tid);
622
623 mutex_lock(&monc->mutex);
624 req = __lookup_generic_req(monc, tid);
625 if (req) {
626 *(struct ceph_statfs *)req->buf = reply->st;
627 req->result = 0;
628 get_generic_request(req);
629 }
630 mutex_unlock(&monc->mutex);
631 if (req) {
632 complete_all(&req->completion);
633 put_generic_request(req);
634 }
635 return;
636
637bad:
638 pr_err("corrupt statfs reply, tid %llu\n", tid);
639 ceph_msg_dump(msg);
640}
641
642/*
643 * Do a synchronous statfs().
644 */
645int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf)
646{
647 struct ceph_mon_generic_request *req;
648 struct ceph_mon_statfs *h;
649 int err;
650
651 req = kzalloc(sizeof(*req), GFP_NOFS);
652 if (!req)
653 return -ENOMEM;
654
655 kref_init(&req->kref);
656 req->buf = buf;
657 init_completion(&req->completion);
658
659 err = -ENOMEM;
660 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS,
661 true);
662 if (!req->request)
663 goto out;
664 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 1024, GFP_NOFS,
665 true);
666 if (!req->reply)
667 goto out;
668
669 /* fill out request */
670 h = req->request->front.iov_base;
671 h->monhdr.have_version = 0;
672 h->monhdr.session_mon = cpu_to_le16(-1);
673 h->monhdr.session_mon_tid = 0;
674 h->fsid = monc->monmap->fsid;
675
676 err = do_generic_request(monc, req);
677
678out:
679 put_generic_request(req);
680 return err;
681}
682EXPORT_SYMBOL(ceph_monc_do_statfs);
683
684static void handle_get_version_reply(struct ceph_mon_client *monc,
685 struct ceph_msg *msg)
686{
687 struct ceph_mon_generic_request *req;
688 u64 tid = le64_to_cpu(msg->hdr.tid);
689 void *p = msg->front.iov_base;
690 void *end = p + msg->front_alloc_len;
691 u64 handle;
692
693 dout("%s %p tid %llu\n", __func__, msg, tid);
694
695 ceph_decode_need(&p, end, 2*sizeof(u64), bad);
696 handle = ceph_decode_64(&p);
697 if (tid != 0 && tid != handle)
698 goto bad;
699
700 mutex_lock(&monc->mutex);
701 req = __lookup_generic_req(monc, handle);
702 if (req) {
703 *(u64 *)req->buf = ceph_decode_64(&p);
704 req->result = 0;
705 get_generic_request(req);
706 }
707 mutex_unlock(&monc->mutex);
708 if (req) {
709 complete_all(&req->completion);
710 put_generic_request(req);
711 }
712
713 return;
714bad:
715 pr_err("corrupt mon_get_version reply, tid %llu\n", tid);
716 ceph_msg_dump(msg);
717}
718
719/*
720 * Send MMonGetVersion and wait for the reply.
721 *
722 * @what: one of "mdsmap", "osdmap" or "monmap"
723 */
724int ceph_monc_do_get_version(struct ceph_mon_client *monc, const char *what,
725 u64 *newest)
726{
727 struct ceph_mon_generic_request *req;
728 void *p, *end;
729 u64 tid;
730 int err;
731
732 req = kzalloc(sizeof(*req), GFP_NOFS);
733 if (!req)
734 return -ENOMEM;
735
736 kref_init(&req->kref);
737 req->buf = newest;
738 init_completion(&req->completion);
739
740 req->request = ceph_msg_new(CEPH_MSG_MON_GET_VERSION,
741 sizeof(u64) + sizeof(u32) + strlen(what),
742 GFP_NOFS, true);
743 if (!req->request) {
744 err = -ENOMEM;
745 goto out;
746 }
747
748 req->reply = ceph_msg_new(CEPH_MSG_MON_GET_VERSION_REPLY, 1024,
749 GFP_NOFS, true);
750 if (!req->reply) {
751 err = -ENOMEM;
752 goto out;
753 }
754
755 p = req->request->front.iov_base;
756 end = p + req->request->front_alloc_len;
757
758 /* fill out request */
759 mutex_lock(&monc->mutex);
760 tid = ++monc->last_tid;
761 ceph_encode_64(&p, tid); /* handle */
762 ceph_encode_string(&p, end, what, strlen(what));
763
764 err = __do_generic_request(monc, tid, req);
765
766 mutex_unlock(&monc->mutex);
767out:
768 put_generic_request(req);
769 return err;
770}
771EXPORT_SYMBOL(ceph_monc_do_get_version);
772
773/*
774 * Resend pending generic requests.
775 */
776static void __resend_generic_request(struct ceph_mon_client *monc)
777{
778 struct ceph_mon_generic_request *req;
779 struct rb_node *p;
780
781 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
782 req = rb_entry(p, struct ceph_mon_generic_request, node);
783 ceph_msg_revoke(req->request);
784 ceph_msg_revoke_incoming(req->reply);
785 ceph_con_send(&monc->con, ceph_msg_get(req->request));
786 }
787}
788
789/*
790 * Delayed work. If we haven't mounted yet, retry. Otherwise,
791 * renew/retry subscription as needed (in case it is timing out, or we
792 * got an ENOMEM). And keep the monitor connection alive.
793 */
794static void delayed_work(struct work_struct *work)
795{
796 struct ceph_mon_client *monc =
797 container_of(work, struct ceph_mon_client, delayed_work.work);
798
799 dout("monc delayed_work\n");
800 mutex_lock(&monc->mutex);
801 if (monc->hunting) {
802 dout("%s continuing hunt\n", __func__);
803 reopen_session(monc);
804 } else {
805 int is_auth = ceph_auth_is_authenticated(monc->auth);
806 if (ceph_con_keepalive_expired(&monc->con,
807 CEPH_MONC_PING_TIMEOUT)) {
808 dout("monc keepalive timeout\n");
809 is_auth = 0;
810 reopen_session(monc);
811 }
812
813 if (!monc->hunting) {
814 ceph_con_keepalive(&monc->con);
815 __validate_auth(monc);
816 }
817
818 if (is_auth) {
819 unsigned long now = jiffies;
820
821 dout("%s renew subs? now %lu renew after %lu\n",
822 __func__, now, monc->sub_renew_after);
823 if (time_after_eq(now, monc->sub_renew_after))
824 __send_subscribe(monc);
825 }
826 }
827 __schedule_delayed(monc);
828 mutex_unlock(&monc->mutex);
829}
830
831/*
832 * On startup, we build a temporary monmap populated with the IPs
833 * provided by mount(2).
834 */
835static int build_initial_monmap(struct ceph_mon_client *monc)
836{
837 struct ceph_options *opt = monc->client->options;
838 struct ceph_entity_addr *mon_addr = opt->mon_addr;
839 int num_mon = opt->num_mon;
840 int i;
841
842 /* build initial monmap */
843 monc->monmap = kzalloc(sizeof(*monc->monmap) +
844 num_mon*sizeof(monc->monmap->mon_inst[0]),
845 GFP_KERNEL);
846 if (!monc->monmap)
847 return -ENOMEM;
848 for (i = 0; i < num_mon; i++) {
849 monc->monmap->mon_inst[i].addr = mon_addr[i];
850 monc->monmap->mon_inst[i].addr.nonce = 0;
851 monc->monmap->mon_inst[i].name.type =
852 CEPH_ENTITY_TYPE_MON;
853 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
854 }
855 monc->monmap->num_mon = num_mon;
856 return 0;
857}
858
859int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
860{
861 int err = 0;
862
863 dout("init\n");
864 memset(monc, 0, sizeof(*monc));
865 monc->client = cl;
866 monc->monmap = NULL;
867 mutex_init(&monc->mutex);
868
869 err = build_initial_monmap(monc);
870 if (err)
871 goto out;
872
873 /* connection */
874 /* authentication */
875 monc->auth = ceph_auth_init(cl->options->name,
876 cl->options->key);
877 if (IS_ERR(monc->auth)) {
878 err = PTR_ERR(monc->auth);
879 goto out_monmap;
880 }
881 monc->auth->want_keys =
882 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
883 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
884
885 /* msgs */
886 err = -ENOMEM;
887 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
888 sizeof(struct ceph_mon_subscribe_ack),
889 GFP_NOFS, true);
890 if (!monc->m_subscribe_ack)
891 goto out_auth;
892
893 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS,
894 true);
895 if (!monc->m_subscribe)
896 goto out_subscribe_ack;
897
898 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS,
899 true);
900 if (!monc->m_auth_reply)
901 goto out_subscribe;
902
903 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS, true);
904 monc->pending_auth = 0;
905 if (!monc->m_auth)
906 goto out_auth_reply;
907
908 ceph_con_init(&monc->con, monc, &mon_con_ops,
909 &monc->client->msgr);
910
911 monc->cur_mon = -1;
912 monc->had_a_connection = false;
913 monc->hunt_mult = 1;
914
915 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
916 monc->generic_request_tree = RB_ROOT;
917 monc->num_generic_requests = 0;
918 monc->last_tid = 0;
919
920 return 0;
921
922out_auth_reply:
923 ceph_msg_put(monc->m_auth_reply);
924out_subscribe:
925 ceph_msg_put(monc->m_subscribe);
926out_subscribe_ack:
927 ceph_msg_put(monc->m_subscribe_ack);
928out_auth:
929 ceph_auth_destroy(monc->auth);
930out_monmap:
931 kfree(monc->monmap);
932out:
933 return err;
934}
935EXPORT_SYMBOL(ceph_monc_init);
936
937void ceph_monc_stop(struct ceph_mon_client *monc)
938{
939 dout("stop\n");
940 cancel_delayed_work_sync(&monc->delayed_work);
941
942 mutex_lock(&monc->mutex);
943 __close_session(monc);
944 monc->cur_mon = -1;
945 mutex_unlock(&monc->mutex);
946
947 /*
948 * flush msgr queue before we destroy ourselves to ensure that:
949 * - any work that references our embedded con is finished.
950 * - any osd_client or other work that may reference an authorizer
951 * finishes before we shut down the auth subsystem.
952 */
953 ceph_msgr_flush();
954
955 ceph_auth_destroy(monc->auth);
956
957 ceph_msg_put(monc->m_auth);
958 ceph_msg_put(monc->m_auth_reply);
959 ceph_msg_put(monc->m_subscribe);
960 ceph_msg_put(monc->m_subscribe_ack);
961
962 kfree(monc->monmap);
963}
964EXPORT_SYMBOL(ceph_monc_stop);
965
966static void finish_hunting(struct ceph_mon_client *monc)
967{
968 if (monc->hunting) {
969 dout("%s found mon%d\n", __func__, monc->cur_mon);
970 monc->hunting = false;
971 monc->had_a_connection = true;
972 monc->hunt_mult /= 2; /* reduce by 50% */
973 if (monc->hunt_mult < 1)
974 monc->hunt_mult = 1;
975 }
976}
977
978static void handle_auth_reply(struct ceph_mon_client *monc,
979 struct ceph_msg *msg)
980{
981 int ret;
982 int was_auth = 0;
983
984 mutex_lock(&monc->mutex);
985 was_auth = ceph_auth_is_authenticated(monc->auth);
986 monc->pending_auth = 0;
987 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
988 msg->front.iov_len,
989 monc->m_auth->front.iov_base,
990 monc->m_auth->front_alloc_len);
991 if (ret > 0) {
992 __send_prepared_auth_request(monc, ret);
993 goto out;
994 }
995
996 finish_hunting(monc);
997
998 if (ret < 0) {
999 monc->client->auth_err = ret;
1000 } else if (!was_auth && ceph_auth_is_authenticated(monc->auth)) {
1001 dout("authenticated, starting session\n");
1002
1003 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
1004 monc->client->msgr.inst.name.num =
1005 cpu_to_le64(monc->auth->global_id);
1006
1007 __send_subscribe(monc);
1008 __resend_generic_request(monc);
1009
1010 pr_info("mon%d %s session established\n", monc->cur_mon,
1011 ceph_pr_addr(&monc->con.peer_addr.in_addr));
1012 }
1013
1014out:
1015 mutex_unlock(&monc->mutex);
1016 if (monc->client->auth_err < 0)
1017 wake_up_all(&monc->client->auth_wq);
1018}
1019
1020static int __validate_auth(struct ceph_mon_client *monc)
1021{
1022 int ret;
1023
1024 if (monc->pending_auth)
1025 return 0;
1026
1027 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
1028 monc->m_auth->front_alloc_len);
1029 if (ret <= 0)
1030 return ret; /* either an error, or no need to authenticate */
1031 __send_prepared_auth_request(monc, ret);
1032 return 0;
1033}
1034
1035int ceph_monc_validate_auth(struct ceph_mon_client *monc)
1036{
1037 int ret;
1038
1039 mutex_lock(&monc->mutex);
1040 ret = __validate_auth(monc);
1041 mutex_unlock(&monc->mutex);
1042 return ret;
1043}
1044EXPORT_SYMBOL(ceph_monc_validate_auth);
1045
1046/*
1047 * handle incoming message
1048 */
1049static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1050{
1051 struct ceph_mon_client *monc = con->private;
1052 int type = le16_to_cpu(msg->hdr.type);
1053
1054 if (!monc)
1055 return;
1056
1057 switch (type) {
1058 case CEPH_MSG_AUTH_REPLY:
1059 handle_auth_reply(monc, msg);
1060 break;
1061
1062 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1063 handle_subscribe_ack(monc, msg);
1064 break;
1065
1066 case CEPH_MSG_STATFS_REPLY:
1067 handle_statfs_reply(monc, msg);
1068 break;
1069
1070 case CEPH_MSG_MON_GET_VERSION_REPLY:
1071 handle_get_version_reply(monc, msg);
1072 break;
1073
1074 case CEPH_MSG_MON_MAP:
1075 ceph_monc_handle_map(monc, msg);
1076 break;
1077
1078 case CEPH_MSG_OSD_MAP:
1079 ceph_osdc_handle_map(&monc->client->osdc, msg);
1080 break;
1081
1082 default:
1083 /* can the chained handler handle it? */
1084 if (monc->client->extra_mon_dispatch &&
1085 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1086 break;
1087
1088 pr_err("received unknown message type %d %s\n", type,
1089 ceph_msg_type_name(type));
1090 }
1091 ceph_msg_put(msg);
1092}
1093
1094/*
1095 * Allocate memory for incoming message
1096 */
1097static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1098 struct ceph_msg_header *hdr,
1099 int *skip)
1100{
1101 struct ceph_mon_client *monc = con->private;
1102 int type = le16_to_cpu(hdr->type);
1103 int front_len = le32_to_cpu(hdr->front_len);
1104 struct ceph_msg *m = NULL;
1105
1106 *skip = 0;
1107
1108 switch (type) {
1109 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1110 m = ceph_msg_get(monc->m_subscribe_ack);
1111 break;
1112 case CEPH_MSG_STATFS_REPLY:
1113 return get_generic_reply(con, hdr, skip);
1114 case CEPH_MSG_AUTH_REPLY:
1115 m = ceph_msg_get(monc->m_auth_reply);
1116 break;
1117 case CEPH_MSG_MON_GET_VERSION_REPLY:
1118 if (le64_to_cpu(hdr->tid) != 0)
1119 return get_generic_reply(con, hdr, skip);
1120
1121 /*
1122 * Older OSDs don't set reply tid even if the orignal
1123 * request had a non-zero tid. Workaround this weirdness
1124 * by falling through to the allocate case.
1125 */
1126 case CEPH_MSG_MON_MAP:
1127 case CEPH_MSG_MDS_MAP:
1128 case CEPH_MSG_OSD_MAP:
1129 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1130 if (!m)
1131 return NULL; /* ENOMEM--return skip == 0 */
1132 break;
1133 }
1134
1135 if (!m) {
1136 pr_info("alloc_msg unknown type %d\n", type);
1137 *skip = 1;
1138 } else if (front_len > m->front_alloc_len) {
1139 pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
1140 front_len, m->front_alloc_len,
1141 (unsigned int)con->peer_name.type,
1142 le64_to_cpu(con->peer_name.num));
1143 ceph_msg_put(m);
1144 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1145 }
1146
1147 return m;
1148}
1149
1150/*
1151 * If the monitor connection resets, pick a new monitor and resubmit
1152 * any pending requests.
1153 */
1154static void mon_fault(struct ceph_connection *con)
1155{
1156 struct ceph_mon_client *monc = con->private;
1157
1158 mutex_lock(&monc->mutex);
1159 dout("%s mon%d\n", __func__, monc->cur_mon);
1160 if (monc->cur_mon >= 0) {
1161 if (!monc->hunting) {
1162 dout("%s hunting for new mon\n", __func__);
1163 reopen_session(monc);
1164 __schedule_delayed(monc);
1165 } else {
1166 dout("%s already hunting\n", __func__);
1167 }
1168 }
1169 mutex_unlock(&monc->mutex);
1170}
1171
1172/*
1173 * We can ignore refcounting on the connection struct, as all references
1174 * will come from the messenger workqueue, which is drained prior to
1175 * mon_client destruction.
1176 */
1177static struct ceph_connection *con_get(struct ceph_connection *con)
1178{
1179 return con;
1180}
1181
1182static void con_put(struct ceph_connection *con)
1183{
1184}
1185
1186static const struct ceph_connection_operations mon_con_ops = {
1187 .get = con_get,
1188 .put = con_put,
1189 .dispatch = dispatch,
1190 .fault = mon_fault,
1191 .alloc_msg = mon_alloc_msg,
1192};