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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 u32 blob_len;
76 u32 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 %u\n", __func__, &fsid, epoch,
116 num_mon);
117 if (num_mon == 0 || num_mon > CEPH_MAX_MON)
118 goto e_inval;
119
120 monmap = kmalloc_flex(*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 BUG_ON(len > monc->m_auth->front_alloc_len);
178
179 monc->pending_auth = 1;
180 monc->m_auth->front.iov_len = len;
181 monc->m_auth->hdr.front_len = cpu_to_le32(len);
182 ceph_msg_revoke(monc->m_auth);
183 ceph_msg_get(monc->m_auth); /* keep our ref */
184 ceph_con_send(&monc->con, monc->m_auth);
185}
186
187/*
188 * Close monitor session, if any.
189 */
190static void __close_session(struct ceph_mon_client *monc)
191{
192 dout("__close_session closing mon%d\n", monc->cur_mon);
193 ceph_msg_revoke(monc->m_auth);
194 ceph_msg_revoke_incoming(monc->m_auth_reply);
195 ceph_msg_revoke(monc->m_subscribe);
196 ceph_msg_revoke_incoming(monc->m_subscribe_ack);
197 ceph_con_close(&monc->con);
198
199 monc->pending_auth = 0;
200 ceph_auth_reset(monc->auth);
201}
202
203/*
204 * Pick a new monitor at random and set cur_mon. If we are repicking
205 * (i.e. cur_mon is already set), be sure to pick a different one.
206 */
207static void pick_new_mon(struct ceph_mon_client *monc)
208{
209 int old_mon = monc->cur_mon;
210
211 BUG_ON(monc->monmap->num_mon < 1);
212
213 if (monc->monmap->num_mon == 1) {
214 monc->cur_mon = 0;
215 } else {
216 int max = monc->monmap->num_mon;
217 int o = -1;
218 int n;
219
220 if (monc->cur_mon >= 0) {
221 if (monc->cur_mon < monc->monmap->num_mon)
222 o = monc->cur_mon;
223 if (o >= 0)
224 max--;
225 }
226
227 n = get_random_u32_below(max);
228 if (o >= 0 && n >= o)
229 n++;
230
231 monc->cur_mon = n;
232 }
233
234 dout("%s mon%d -> mon%d out of %d mons\n", __func__, old_mon,
235 monc->cur_mon, monc->monmap->num_mon);
236}
237
238/*
239 * Open a session with a new monitor.
240 */
241static void __open_session(struct ceph_mon_client *monc)
242{
243 int ret;
244
245 pick_new_mon(monc);
246
247 monc->hunting = true;
248 if (monc->had_a_connection) {
249 monc->hunt_mult *= CEPH_MONC_HUNT_BACKOFF;
250 if (monc->hunt_mult > CEPH_MONC_HUNT_MAX_MULT)
251 monc->hunt_mult = CEPH_MONC_HUNT_MAX_MULT;
252 }
253
254 monc->sub_renew_after = jiffies; /* i.e., expired */
255 monc->sub_renew_sent = 0;
256
257 dout("%s opening mon%d\n", __func__, monc->cur_mon);
258 ceph_con_open(&monc->con, CEPH_ENTITY_TYPE_MON, monc->cur_mon,
259 &monc->monmap->mon_inst[monc->cur_mon].addr);
260
261 /*
262 * Queue a keepalive to ensure that in case of an early fault
263 * the messenger doesn't put us into STANDBY state and instead
264 * retries. This also ensures that our timestamp is valid by
265 * the time we finish hunting and delayed_work() checks it.
266 */
267 ceph_con_keepalive(&monc->con);
268 if (ceph_msgr2(monc->client)) {
269 monc->pending_auth = 1;
270 return;
271 }
272
273 /* initiate authentication handshake */
274 ret = ceph_auth_build_hello(monc->auth,
275 monc->m_auth->front.iov_base,
276 monc->m_auth->front_alloc_len);
277 BUG_ON(ret <= 0);
278 __send_prepared_auth_request(monc, ret);
279}
280
281static void reopen_session(struct ceph_mon_client *monc)
282{
283 if (!monc->hunting)
284 pr_info("mon%d %s session lost, hunting for new mon\n",
285 monc->cur_mon, ceph_pr_addr(&monc->con.peer_addr));
286
287 __close_session(monc);
288 __open_session(monc);
289}
290
291void ceph_monc_reopen_session(struct ceph_mon_client *monc)
292{
293 mutex_lock(&monc->mutex);
294 reopen_session(monc);
295 mutex_unlock(&monc->mutex);
296}
297
298static void un_backoff(struct ceph_mon_client *monc)
299{
300 monc->hunt_mult /= 2; /* reduce by 50% */
301 if (monc->hunt_mult < 1)
302 monc->hunt_mult = 1;
303 dout("%s hunt_mult now %d\n", __func__, monc->hunt_mult);
304}
305
306/*
307 * Reschedule delayed work timer.
308 */
309static void __schedule_delayed(struct ceph_mon_client *monc)
310{
311 unsigned long delay;
312
313 if (monc->hunting)
314 delay = CEPH_MONC_HUNT_INTERVAL * monc->hunt_mult;
315 else
316 delay = CEPH_MONC_PING_INTERVAL;
317
318 dout("__schedule_delayed after %lu\n", delay);
319 mod_delayed_work(system_percpu_wq, &monc->delayed_work,
320 round_jiffies_relative(delay));
321}
322
323const char *ceph_sub_str[] = {
324 [CEPH_SUB_MONMAP] = "monmap",
325 [CEPH_SUB_OSDMAP] = "osdmap",
326 [CEPH_SUB_FSMAP] = "fsmap.user",
327 [CEPH_SUB_MDSMAP] = "mdsmap",
328};
329
330/*
331 * Send subscribe request for one or more maps, according to
332 * monc->subs.
333 */
334static void __send_subscribe(struct ceph_mon_client *monc)
335{
336 struct ceph_msg *msg = monc->m_subscribe;
337 void *p = msg->front.iov_base;
338 void *const end = p + msg->front_alloc_len;
339 int num = 0;
340 int i;
341
342 dout("%s sent %lu\n", __func__, monc->sub_renew_sent);
343
344 BUG_ON(monc->cur_mon < 0);
345
346 if (!monc->sub_renew_sent)
347 monc->sub_renew_sent = jiffies | 1; /* never 0 */
348
349 msg->hdr.version = cpu_to_le16(2);
350
351 for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
352 if (monc->subs[i].want)
353 num++;
354 }
355 BUG_ON(num < 1); /* monmap sub is always there */
356 ceph_encode_32(&p, num);
357 for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
358 char buf[32];
359 int len;
360
361 if (!monc->subs[i].want)
362 continue;
363
364 len = sprintf(buf, "%s", ceph_sub_str[i]);
365 if (i == CEPH_SUB_MDSMAP &&
366 monc->fs_cluster_id != CEPH_FS_CLUSTER_ID_NONE)
367 len += sprintf(buf + len, ".%d", monc->fs_cluster_id);
368
369 dout("%s %s start %llu flags 0x%x\n", __func__, buf,
370 le64_to_cpu(monc->subs[i].item.start),
371 monc->subs[i].item.flags);
372 ceph_encode_string(&p, end, buf, len);
373 memcpy(p, &monc->subs[i].item, sizeof(monc->subs[i].item));
374 p += sizeof(monc->subs[i].item);
375 }
376
377 BUG_ON(p > end);
378 msg->front.iov_len = p - msg->front.iov_base;
379 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
380 ceph_msg_revoke(msg);
381 ceph_con_send(&monc->con, ceph_msg_get(msg));
382}
383
384static void handle_subscribe_ack(struct ceph_mon_client *monc,
385 struct ceph_msg *msg)
386{
387 unsigned int seconds;
388 struct ceph_mon_subscribe_ack *h = msg->front.iov_base;
389
390 if (msg->front.iov_len < sizeof(*h))
391 goto bad;
392 seconds = le32_to_cpu(h->duration);
393
394 mutex_lock(&monc->mutex);
395 if (monc->sub_renew_sent) {
396 /*
397 * This is only needed for legacy (infernalis or older)
398 * MONs -- see delayed_work().
399 */
400 monc->sub_renew_after = monc->sub_renew_sent +
401 (seconds >> 1) * HZ - 1;
402 dout("%s sent %lu duration %d renew after %lu\n", __func__,
403 monc->sub_renew_sent, seconds, monc->sub_renew_after);
404 monc->sub_renew_sent = 0;
405 } else {
406 dout("%s sent %lu renew after %lu, ignoring\n", __func__,
407 monc->sub_renew_sent, monc->sub_renew_after);
408 }
409 mutex_unlock(&monc->mutex);
410 return;
411bad:
412 pr_err("got corrupt subscribe-ack msg\n");
413 ceph_msg_dump(msg);
414}
415
416/*
417 * Register interest in a map
418 *
419 * @sub: one of CEPH_SUB_*
420 * @epoch: X for "every map since X", or 0 for "just the latest"
421 */
422static bool __ceph_monc_want_map(struct ceph_mon_client *monc, int sub,
423 u32 epoch, bool continuous)
424{
425 __le64 start = cpu_to_le64(epoch);
426 u8 flags = !continuous ? CEPH_SUBSCRIBE_ONETIME : 0;
427
428 dout("%s %s epoch %u continuous %d\n", __func__, ceph_sub_str[sub],
429 epoch, continuous);
430
431 if (monc->subs[sub].want &&
432 monc->subs[sub].item.start == start &&
433 monc->subs[sub].item.flags == flags)
434 return false;
435
436 monc->subs[sub].item.start = start;
437 monc->subs[sub].item.flags = flags;
438 monc->subs[sub].want = true;
439
440 return true;
441}
442
443bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
444 bool continuous)
445{
446 bool need_request;
447
448 mutex_lock(&monc->mutex);
449 need_request = __ceph_monc_want_map(monc, sub, epoch, continuous);
450 mutex_unlock(&monc->mutex);
451
452 return need_request;
453}
454EXPORT_SYMBOL(ceph_monc_want_map);
455
456/*
457 * Keep track of which maps we have
458 *
459 * @sub: one of CEPH_SUB_*
460 */
461static void __ceph_monc_got_map(struct ceph_mon_client *monc, int sub,
462 u32 epoch)
463{
464 dout("%s %s epoch %u\n", __func__, ceph_sub_str[sub], epoch);
465
466 if (monc->subs[sub].want) {
467 if (monc->subs[sub].item.flags & CEPH_SUBSCRIBE_ONETIME)
468 monc->subs[sub].want = false;
469 else
470 monc->subs[sub].item.start = cpu_to_le64(epoch + 1);
471 }
472
473 monc->subs[sub].have = epoch;
474}
475
476void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch)
477{
478 mutex_lock(&monc->mutex);
479 __ceph_monc_got_map(monc, sub, epoch);
480 mutex_unlock(&monc->mutex);
481}
482EXPORT_SYMBOL(ceph_monc_got_map);
483
484void ceph_monc_renew_subs(struct ceph_mon_client *monc)
485{
486 mutex_lock(&monc->mutex);
487 __send_subscribe(monc);
488 mutex_unlock(&monc->mutex);
489}
490EXPORT_SYMBOL(ceph_monc_renew_subs);
491
492/*
493 * Wait for an osdmap with a given epoch.
494 *
495 * @epoch: epoch to wait for
496 * @timeout: in jiffies, 0 means "wait forever"
497 */
498int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
499 unsigned long timeout)
500{
501 unsigned long started = jiffies;
502 long ret;
503
504 mutex_lock(&monc->mutex);
505 while (monc->subs[CEPH_SUB_OSDMAP].have < epoch) {
506 mutex_unlock(&monc->mutex);
507
508 if (timeout && time_after_eq(jiffies, started + timeout))
509 return -ETIMEDOUT;
510
511 ret = wait_event_interruptible_timeout(monc->client->auth_wq,
512 monc->subs[CEPH_SUB_OSDMAP].have >= epoch,
513 ceph_timeout_jiffies(timeout));
514 if (ret < 0)
515 return ret;
516
517 mutex_lock(&monc->mutex);
518 }
519
520 mutex_unlock(&monc->mutex);
521 return 0;
522}
523EXPORT_SYMBOL(ceph_monc_wait_osdmap);
524
525/*
526 * Open a session with a random monitor. Request monmap and osdmap,
527 * which are waited upon in __ceph_open_session().
528 */
529int ceph_monc_open_session(struct ceph_mon_client *monc)
530{
531 mutex_lock(&monc->mutex);
532 __ceph_monc_want_map(monc, CEPH_SUB_MONMAP, 0, true);
533 __ceph_monc_want_map(monc, CEPH_SUB_OSDMAP, 0, false);
534 __open_session(monc);
535 __schedule_delayed(monc);
536 mutex_unlock(&monc->mutex);
537 return 0;
538}
539EXPORT_SYMBOL(ceph_monc_open_session);
540
541static void ceph_monc_handle_map(struct ceph_mon_client *monc,
542 struct ceph_msg *msg)
543{
544 struct ceph_client *client = monc->client;
545 struct ceph_monmap *monmap;
546 void *p, *end;
547
548 mutex_lock(&monc->mutex);
549
550 dout("handle_monmap\n");
551 p = msg->front.iov_base;
552 end = p + msg->front.iov_len;
553
554 monmap = ceph_monmap_decode(&p, end, ceph_msgr2(client));
555 if (IS_ERR(monmap)) {
556 pr_err("problem decoding monmap, %d\n",
557 (int)PTR_ERR(monmap));
558 ceph_msg_dump(msg);
559 goto out;
560 }
561
562 if (ceph_check_fsid(client, &monmap->fsid) < 0) {
563 kfree(monmap);
564 goto out;
565 }
566
567 kfree(monc->monmap);
568 monc->monmap = monmap;
569
570 __ceph_monc_got_map(monc, CEPH_SUB_MONMAP, monc->monmap->epoch);
571 client->have_fsid = true;
572
573out:
574 mutex_unlock(&monc->mutex);
575 wake_up_all(&client->auth_wq);
576}
577
578/*
579 * generic requests (currently statfs, mon_get_version)
580 */
581DEFINE_RB_FUNCS(generic_request, struct ceph_mon_generic_request, tid, node)
582
583static void release_generic_request(struct kref *kref)
584{
585 struct ceph_mon_generic_request *req =
586 container_of(kref, struct ceph_mon_generic_request, kref);
587
588 dout("%s greq %p request %p reply %p\n", __func__, req, req->request,
589 req->reply);
590 WARN_ON(!RB_EMPTY_NODE(&req->node));
591
592 if (req->reply)
593 ceph_msg_put(req->reply);
594 if (req->request)
595 ceph_msg_put(req->request);
596
597 kfree(req);
598}
599
600static void put_generic_request(struct ceph_mon_generic_request *req)
601{
602 if (req)
603 kref_put(&req->kref, release_generic_request);
604}
605
606static void get_generic_request(struct ceph_mon_generic_request *req)
607{
608 kref_get(&req->kref);
609}
610
611static struct ceph_mon_generic_request *
612alloc_generic_request(struct ceph_mon_client *monc, gfp_t gfp)
613{
614 struct ceph_mon_generic_request *req;
615
616 req = kzalloc_obj(*req, gfp);
617 if (!req)
618 return NULL;
619
620 req->monc = monc;
621 kref_init(&req->kref);
622 RB_CLEAR_NODE(&req->node);
623 init_completion(&req->completion);
624
625 dout("%s greq %p\n", __func__, req);
626 return req;
627}
628
629static void register_generic_request(struct ceph_mon_generic_request *req)
630{
631 struct ceph_mon_client *monc = req->monc;
632
633 WARN_ON(req->tid);
634
635 get_generic_request(req);
636 req->tid = ++monc->last_tid;
637 insert_generic_request(&monc->generic_request_tree, req);
638}
639
640static void send_generic_request(struct ceph_mon_client *monc,
641 struct ceph_mon_generic_request *req)
642{
643 WARN_ON(!req->tid);
644
645 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
646 req->request->hdr.tid = cpu_to_le64(req->tid);
647 ceph_con_send(&monc->con, ceph_msg_get(req->request));
648}
649
650static void __finish_generic_request(struct ceph_mon_generic_request *req)
651{
652 struct ceph_mon_client *monc = req->monc;
653
654 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
655 erase_generic_request(&monc->generic_request_tree, req);
656
657 ceph_msg_revoke(req->request);
658 ceph_msg_revoke_incoming(req->reply);
659}
660
661static void finish_generic_request(struct ceph_mon_generic_request *req)
662{
663 __finish_generic_request(req);
664 put_generic_request(req);
665}
666
667static void complete_generic_request(struct ceph_mon_generic_request *req)
668{
669 if (req->complete_cb)
670 req->complete_cb(req);
671 else
672 complete_all(&req->completion);
673 put_generic_request(req);
674}
675
676static void cancel_generic_request(struct ceph_mon_generic_request *req)
677{
678 struct ceph_mon_client *monc = req->monc;
679 struct ceph_mon_generic_request *lookup_req;
680
681 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
682
683 mutex_lock(&monc->mutex);
684 lookup_req = lookup_generic_request(&monc->generic_request_tree,
685 req->tid);
686 if (lookup_req) {
687 WARN_ON(lookup_req != req);
688 finish_generic_request(req);
689 }
690
691 mutex_unlock(&monc->mutex);
692}
693
694static int wait_generic_request(struct ceph_mon_generic_request *req)
695{
696 int ret;
697
698 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
699 ret = wait_for_completion_interruptible(&req->completion);
700 if (ret)
701 cancel_generic_request(req);
702 else
703 ret = req->result; /* completed */
704
705 return ret;
706}
707
708static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
709 struct ceph_msg_header *hdr,
710 int *skip)
711{
712 struct ceph_mon_client *monc = con->private;
713 struct ceph_mon_generic_request *req;
714 u64 tid = le64_to_cpu(hdr->tid);
715 struct ceph_msg *m;
716
717 mutex_lock(&monc->mutex);
718 req = lookup_generic_request(&monc->generic_request_tree, tid);
719 if (!req) {
720 dout("get_generic_reply %lld dne\n", tid);
721 *skip = 1;
722 m = NULL;
723 } else {
724 dout("get_generic_reply %lld got %p\n", tid, req->reply);
725 *skip = 0;
726 m = ceph_msg_get(req->reply);
727 /*
728 * we don't need to track the connection reading into
729 * this reply because we only have one open connection
730 * at a time, ever.
731 */
732 }
733 mutex_unlock(&monc->mutex);
734 return m;
735}
736
737/*
738 * statfs
739 */
740static void handle_statfs_reply(struct ceph_mon_client *monc,
741 struct ceph_msg *msg)
742{
743 struct ceph_mon_generic_request *req;
744 struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
745 u64 tid = le64_to_cpu(msg->hdr.tid);
746
747 dout("%s msg %p tid %llu\n", __func__, msg, tid);
748
749 if (msg->front.iov_len != sizeof(*reply))
750 goto bad;
751
752 mutex_lock(&monc->mutex);
753 req = lookup_generic_request(&monc->generic_request_tree, tid);
754 if (!req) {
755 mutex_unlock(&monc->mutex);
756 return;
757 }
758
759 req->result = 0;
760 *req->u.st = reply->st; /* struct */
761 __finish_generic_request(req);
762 mutex_unlock(&monc->mutex);
763
764 complete_generic_request(req);
765 return;
766
767bad:
768 pr_err("corrupt statfs reply, tid %llu\n", tid);
769 ceph_msg_dump(msg);
770}
771
772/*
773 * Do a synchronous statfs().
774 */
775int ceph_monc_do_statfs(struct ceph_mon_client *monc, u64 data_pool,
776 struct ceph_statfs *buf)
777{
778 struct ceph_mon_generic_request *req;
779 struct ceph_mon_statfs *h;
780 int ret = -ENOMEM;
781
782 req = alloc_generic_request(monc, GFP_NOFS);
783 if (!req)
784 goto out;
785
786 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS,
787 true);
788 if (!req->request)
789 goto out;
790
791 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 64, GFP_NOFS, true);
792 if (!req->reply)
793 goto out;
794
795 req->u.st = buf;
796 req->request->hdr.version = cpu_to_le16(2);
797
798 mutex_lock(&monc->mutex);
799 register_generic_request(req);
800 /* fill out request */
801 h = req->request->front.iov_base;
802 h->monhdr.have_version = 0;
803 h->monhdr.session_mon = cpu_to_le16(-1);
804 h->monhdr.session_mon_tid = 0;
805 h->fsid = monc->monmap->fsid;
806 h->contains_data_pool = (data_pool != CEPH_NOPOOL);
807 h->data_pool = cpu_to_le64(data_pool);
808 send_generic_request(monc, req);
809 mutex_unlock(&monc->mutex);
810
811 ret = wait_generic_request(req);
812out:
813 put_generic_request(req);
814 return ret;
815}
816EXPORT_SYMBOL(ceph_monc_do_statfs);
817
818static void handle_get_version_reply(struct ceph_mon_client *monc,
819 struct ceph_msg *msg)
820{
821 struct ceph_mon_generic_request *req;
822 u64 tid = le64_to_cpu(msg->hdr.tid);
823 void *p = msg->front.iov_base;
824 void *const end = p + msg->front.iov_len;
825 u64 handle;
826
827 dout("%s msg %p tid %llu\n", __func__, msg, tid);
828
829 ceph_decode_need(&p, end, 2*sizeof(u64), bad);
830 handle = ceph_decode_64(&p);
831 if (tid != 0 && tid != handle)
832 goto bad;
833
834 mutex_lock(&monc->mutex);
835 req = lookup_generic_request(&monc->generic_request_tree, handle);
836 if (!req) {
837 mutex_unlock(&monc->mutex);
838 return;
839 }
840
841 req->result = 0;
842 req->u.newest = ceph_decode_64(&p);
843 __finish_generic_request(req);
844 mutex_unlock(&monc->mutex);
845
846 complete_generic_request(req);
847 return;
848
849bad:
850 pr_err("corrupt mon_get_version reply, tid %llu\n", tid);
851 ceph_msg_dump(msg);
852}
853
854static struct ceph_mon_generic_request *
855__ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
856 ceph_monc_callback_t cb, u64 private_data)
857{
858 struct ceph_mon_generic_request *req;
859
860 req = alloc_generic_request(monc, GFP_NOIO);
861 if (!req)
862 goto err_put_req;
863
864 req->request = ceph_msg_new(CEPH_MSG_MON_GET_VERSION,
865 sizeof(u64) + sizeof(u32) + strlen(what),
866 GFP_NOIO, true);
867 if (!req->request)
868 goto err_put_req;
869
870 req->reply = ceph_msg_new(CEPH_MSG_MON_GET_VERSION_REPLY, 32, GFP_NOIO,
871 true);
872 if (!req->reply)
873 goto err_put_req;
874
875 req->complete_cb = cb;
876 req->private_data = private_data;
877
878 mutex_lock(&monc->mutex);
879 register_generic_request(req);
880 {
881 void *p = req->request->front.iov_base;
882 void *const end = p + req->request->front_alloc_len;
883
884 ceph_encode_64(&p, req->tid); /* handle */
885 ceph_encode_string(&p, end, what, strlen(what));
886 WARN_ON(p != end);
887 }
888 send_generic_request(monc, req);
889 mutex_unlock(&monc->mutex);
890
891 return req;
892
893err_put_req:
894 put_generic_request(req);
895 return ERR_PTR(-ENOMEM);
896}
897
898/*
899 * Send MMonGetVersion and wait for the reply.
900 *
901 * @what: one of "mdsmap", "osdmap" or "monmap"
902 */
903int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
904 u64 *newest)
905{
906 struct ceph_mon_generic_request *req;
907 int ret;
908
909 req = __ceph_monc_get_version(monc, what, NULL, 0);
910 if (IS_ERR(req))
911 return PTR_ERR(req);
912
913 ret = wait_generic_request(req);
914 if (!ret)
915 *newest = req->u.newest;
916
917 put_generic_request(req);
918 return ret;
919}
920EXPORT_SYMBOL(ceph_monc_get_version);
921
922/*
923 * Send MMonGetVersion,
924 *
925 * @what: one of "mdsmap", "osdmap" or "monmap"
926 */
927int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
928 ceph_monc_callback_t cb, u64 private_data)
929{
930 struct ceph_mon_generic_request *req;
931
932 req = __ceph_monc_get_version(monc, what, cb, private_data);
933 if (IS_ERR(req))
934 return PTR_ERR(req);
935
936 put_generic_request(req);
937 return 0;
938}
939EXPORT_SYMBOL(ceph_monc_get_version_async);
940
941static void handle_command_ack(struct ceph_mon_client *monc,
942 struct ceph_msg *msg)
943{
944 struct ceph_mon_generic_request *req;
945 void *p = msg->front.iov_base;
946 void *const end = p + msg->front_alloc_len;
947 u64 tid = le64_to_cpu(msg->hdr.tid);
948
949 dout("%s msg %p tid %llu\n", __func__, msg, tid);
950
951 ceph_decode_need(&p, end, sizeof(struct ceph_mon_request_header) +
952 sizeof(u32), bad);
953 p += sizeof(struct ceph_mon_request_header);
954
955 mutex_lock(&monc->mutex);
956 req = lookup_generic_request(&monc->generic_request_tree, tid);
957 if (!req) {
958 mutex_unlock(&monc->mutex);
959 return;
960 }
961
962 req->result = ceph_decode_32(&p);
963 __finish_generic_request(req);
964 mutex_unlock(&monc->mutex);
965
966 complete_generic_request(req);
967 return;
968
969bad:
970 pr_err("corrupt mon_command ack, tid %llu\n", tid);
971 ceph_msg_dump(msg);
972}
973
974static __printf(2, 0)
975int do_mon_command_vargs(struct ceph_mon_client *monc, const char *fmt,
976 va_list ap)
977{
978 struct ceph_mon_generic_request *req;
979 struct ceph_mon_command *h;
980 int ret = -ENOMEM;
981 int len;
982
983 req = alloc_generic_request(monc, GFP_NOIO);
984 if (!req)
985 goto out;
986
987 req->request = ceph_msg_new(CEPH_MSG_MON_COMMAND, 256, GFP_NOIO, true);
988 if (!req->request)
989 goto out;
990
991 req->reply = ceph_msg_new(CEPH_MSG_MON_COMMAND_ACK, 512, GFP_NOIO,
992 true);
993 if (!req->reply)
994 goto out;
995
996 mutex_lock(&monc->mutex);
997 register_generic_request(req);
998 h = req->request->front.iov_base;
999 h->monhdr.have_version = 0;
1000 h->monhdr.session_mon = cpu_to_le16(-1);
1001 h->monhdr.session_mon_tid = 0;
1002 h->fsid = monc->monmap->fsid;
1003 h->num_strs = cpu_to_le32(1);
1004 len = vsprintf(h->str, fmt, ap);
1005 h->str_len = cpu_to_le32(len);
1006 send_generic_request(monc, req);
1007 mutex_unlock(&monc->mutex);
1008
1009 ret = wait_generic_request(req);
1010out:
1011 put_generic_request(req);
1012 return ret;
1013}
1014
1015static __printf(2, 3)
1016int do_mon_command(struct ceph_mon_client *monc, const char *fmt, ...)
1017{
1018 va_list ap;
1019 int ret;
1020
1021 va_start(ap, fmt);
1022 ret = do_mon_command_vargs(monc, fmt, ap);
1023 va_end(ap);
1024 return ret;
1025}
1026
1027int ceph_monc_blocklist_add(struct ceph_mon_client *monc,
1028 struct ceph_entity_addr *client_addr)
1029{
1030 int ret;
1031
1032 ret = do_mon_command(monc,
1033 "{ \"prefix\": \"osd blocklist\", \
1034 \"blocklistop\": \"add\", \
1035 \"addr\": \"%pISpc/%u\" }",
1036 &client_addr->in_addr,
1037 le32_to_cpu(client_addr->nonce));
1038 if (ret == -EINVAL) {
1039 /*
1040 * The monitor returns EINVAL on an unrecognized command.
1041 * Try the legacy command -- it is exactly the same except
1042 * for the name.
1043 */
1044 ret = do_mon_command(monc,
1045 "{ \"prefix\": \"osd blacklist\", \
1046 \"blacklistop\": \"add\", \
1047 \"addr\": \"%pISpc/%u\" }",
1048 &client_addr->in_addr,
1049 le32_to_cpu(client_addr->nonce));
1050 }
1051 if (ret)
1052 return ret;
1053
1054 /*
1055 * Make sure we have the osdmap that includes the blocklist
1056 * entry. This is needed to ensure that the OSDs pick up the
1057 * new blocklist before processing any future requests from
1058 * this client.
1059 */
1060 return ceph_wait_for_latest_osdmap(monc->client, 0);
1061}
1062EXPORT_SYMBOL(ceph_monc_blocklist_add);
1063
1064/*
1065 * Resend pending generic requests.
1066 */
1067static void __resend_generic_request(struct ceph_mon_client *monc)
1068{
1069 struct ceph_mon_generic_request *req;
1070 struct rb_node *p;
1071
1072 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
1073 req = rb_entry(p, struct ceph_mon_generic_request, node);
1074 ceph_msg_revoke(req->request);
1075 ceph_msg_revoke_incoming(req->reply);
1076 ceph_con_send(&monc->con, ceph_msg_get(req->request));
1077 }
1078}
1079
1080/*
1081 * Delayed work. If we haven't mounted yet, retry. Otherwise,
1082 * renew/retry subscription as needed (in case it is timing out, or we
1083 * got an ENOMEM). And keep the monitor connection alive.
1084 */
1085static void delayed_work(struct work_struct *work)
1086{
1087 struct ceph_mon_client *monc =
1088 container_of(work, struct ceph_mon_client, delayed_work.work);
1089
1090 mutex_lock(&monc->mutex);
1091 dout("%s mon%d\n", __func__, monc->cur_mon);
1092 if (monc->cur_mon < 0) {
1093 goto out;
1094 }
1095
1096 if (monc->hunting) {
1097 dout("%s continuing hunt\n", __func__);
1098 reopen_session(monc);
1099 } else {
1100 int is_auth = ceph_auth_is_authenticated(monc->auth);
1101
1102 dout("%s is_authed %d\n", __func__, is_auth);
1103 if (ceph_con_keepalive_expired(&monc->con,
1104 CEPH_MONC_PING_TIMEOUT)) {
1105 dout("monc keepalive timeout\n");
1106 is_auth = 0;
1107 reopen_session(monc);
1108 }
1109
1110 if (!monc->hunting) {
1111 ceph_con_keepalive(&monc->con);
1112 __validate_auth(monc);
1113 un_backoff(monc);
1114 }
1115
1116 if (is_auth &&
1117 !(monc->con.peer_features & CEPH_FEATURE_MON_STATEFUL_SUB)) {
1118 unsigned long now = jiffies;
1119
1120 dout("%s renew subs? now %lu renew after %lu\n",
1121 __func__, now, monc->sub_renew_after);
1122 if (time_after_eq(now, monc->sub_renew_after))
1123 __send_subscribe(monc);
1124 }
1125 }
1126 __schedule_delayed(monc);
1127
1128out:
1129 mutex_unlock(&monc->mutex);
1130}
1131
1132/*
1133 * On startup, we build a temporary monmap populated with the IPs
1134 * provided by mount(2).
1135 */
1136static int build_initial_monmap(struct ceph_mon_client *monc)
1137{
1138 __le32 my_type = ceph_msgr2(monc->client) ?
1139 CEPH_ENTITY_ADDR_TYPE_MSGR2 : CEPH_ENTITY_ADDR_TYPE_LEGACY;
1140 struct ceph_options *opt = monc->client->options;
1141 int num_mon = opt->num_mon;
1142 int i;
1143
1144 /* build initial monmap */
1145 monc->monmap = kzalloc_flex(*monc->monmap, mon_inst, num_mon);
1146 if (!monc->monmap)
1147 return -ENOMEM;
1148 monc->monmap->num_mon = num_mon;
1149
1150 for (i = 0; i < num_mon; i++) {
1151 struct ceph_entity_inst *inst = &monc->monmap->mon_inst[i];
1152
1153 memcpy(&inst->addr.in_addr, &opt->mon_addr[i].in_addr,
1154 sizeof(inst->addr.in_addr));
1155 inst->addr.type = my_type;
1156 inst->addr.nonce = 0;
1157 inst->name.type = CEPH_ENTITY_TYPE_MON;
1158 inst->name.num = cpu_to_le64(i);
1159 }
1160 return 0;
1161}
1162
1163int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
1164{
1165 int err;
1166
1167 dout("init\n");
1168 memset(monc, 0, sizeof(*monc));
1169 monc->client = cl;
1170 mutex_init(&monc->mutex);
1171
1172 err = build_initial_monmap(monc);
1173 if (err)
1174 goto out;
1175
1176 /* connection */
1177 /* authentication */
1178 monc->auth = ceph_auth_init(cl->options->name, cl->options->key,
1179 cl->options->con_modes);
1180 if (IS_ERR(monc->auth)) {
1181 err = PTR_ERR(monc->auth);
1182 goto out_monmap;
1183 }
1184 monc->auth->want_keys =
1185 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
1186 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
1187
1188 /* msgs */
1189 err = -ENOMEM;
1190 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
1191 sizeof(struct ceph_mon_subscribe_ack),
1192 GFP_KERNEL, true);
1193 if (!monc->m_subscribe_ack)
1194 goto out_auth;
1195
1196 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 128,
1197 GFP_KERNEL, true);
1198 if (!monc->m_subscribe)
1199 goto out_subscribe_ack;
1200
1201 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096,
1202 GFP_KERNEL, true);
1203 if (!monc->m_auth_reply)
1204 goto out_subscribe;
1205
1206 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_KERNEL, true);
1207 monc->pending_auth = 0;
1208 if (!monc->m_auth)
1209 goto out_auth_reply;
1210
1211 ceph_con_init(&monc->con, monc, &mon_con_ops,
1212 &monc->client->msgr);
1213
1214 monc->cur_mon = -1;
1215 monc->had_a_connection = false;
1216 monc->hunt_mult = 1;
1217
1218 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
1219 monc->generic_request_tree = RB_ROOT;
1220 monc->last_tid = 0;
1221
1222 monc->fs_cluster_id = CEPH_FS_CLUSTER_ID_NONE;
1223
1224 return 0;
1225
1226out_auth_reply:
1227 ceph_msg_put(monc->m_auth_reply);
1228out_subscribe:
1229 ceph_msg_put(monc->m_subscribe);
1230out_subscribe_ack:
1231 ceph_msg_put(monc->m_subscribe_ack);
1232out_auth:
1233 ceph_auth_destroy(monc->auth);
1234out_monmap:
1235 kfree(monc->monmap);
1236out:
1237 return err;
1238}
1239EXPORT_SYMBOL(ceph_monc_init);
1240
1241void ceph_monc_stop(struct ceph_mon_client *monc)
1242{
1243 dout("stop\n");
1244
1245 mutex_lock(&monc->mutex);
1246 __close_session(monc);
1247 monc->hunting = false;
1248 monc->cur_mon = -1;
1249 mutex_unlock(&monc->mutex);
1250
1251 cancel_delayed_work_sync(&monc->delayed_work);
1252
1253 /*
1254 * flush msgr queue before we destroy ourselves to ensure that:
1255 * - any work that references our embedded con is finished.
1256 * - any osd_client or other work that may reference an authorizer
1257 * finishes before we shut down the auth subsystem.
1258 */
1259 ceph_msgr_flush();
1260
1261 ceph_auth_destroy(monc->auth);
1262
1263 WARN_ON(!RB_EMPTY_ROOT(&monc->generic_request_tree));
1264
1265 ceph_msg_put(monc->m_auth);
1266 ceph_msg_put(monc->m_auth_reply);
1267 ceph_msg_put(monc->m_subscribe);
1268 ceph_msg_put(monc->m_subscribe_ack);
1269
1270 kfree(monc->monmap);
1271}
1272EXPORT_SYMBOL(ceph_monc_stop);
1273
1274static void finish_hunting(struct ceph_mon_client *monc)
1275{
1276 if (monc->hunting) {
1277 dout("%s found mon%d\n", __func__, monc->cur_mon);
1278 monc->hunting = false;
1279 monc->had_a_connection = true;
1280 un_backoff(monc);
1281 __schedule_delayed(monc);
1282 }
1283}
1284
1285static void finish_auth(struct ceph_mon_client *monc, int auth_err,
1286 bool was_authed)
1287{
1288 dout("%s auth_err %d was_authed %d\n", __func__, auth_err, was_authed);
1289 WARN_ON(auth_err > 0);
1290
1291 monc->pending_auth = 0;
1292 if (auth_err) {
1293 monc->client->auth_err = auth_err;
1294 wake_up_all(&monc->client->auth_wq);
1295 return;
1296 }
1297
1298 if (!was_authed && ceph_auth_is_authenticated(monc->auth)) {
1299 dout("%s authenticated, starting session global_id %llu\n",
1300 __func__, monc->auth->global_id);
1301
1302 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
1303 monc->client->msgr.inst.name.num =
1304 cpu_to_le64(monc->auth->global_id);
1305
1306 __send_subscribe(monc);
1307 __resend_generic_request(monc);
1308
1309 pr_info("mon%d %s session established\n", monc->cur_mon,
1310 ceph_pr_addr(&monc->con.peer_addr));
1311 }
1312}
1313
1314static void handle_auth_reply(struct ceph_mon_client *monc,
1315 struct ceph_msg *msg)
1316{
1317 bool was_authed;
1318 int ret;
1319
1320 mutex_lock(&monc->mutex);
1321 was_authed = ceph_auth_is_authenticated(monc->auth);
1322 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
1323 msg->front.iov_len,
1324 monc->m_auth->front.iov_base,
1325 monc->m_auth->front_alloc_len);
1326 if (ret > 0) {
1327 __send_prepared_auth_request(monc, ret);
1328 } else {
1329 finish_auth(monc, ret, was_authed);
1330 finish_hunting(monc);
1331 }
1332 mutex_unlock(&monc->mutex);
1333}
1334
1335static int __validate_auth(struct ceph_mon_client *monc)
1336{
1337 int ret;
1338
1339 if (monc->pending_auth)
1340 return 0;
1341
1342 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
1343 monc->m_auth->front_alloc_len);
1344 if (ret <= 0)
1345 return ret; /* either an error, or no need to authenticate */
1346 __send_prepared_auth_request(monc, ret);
1347 return 0;
1348}
1349
1350int ceph_monc_validate_auth(struct ceph_mon_client *monc)
1351{
1352 int ret;
1353
1354 mutex_lock(&monc->mutex);
1355 ret = __validate_auth(monc);
1356 mutex_unlock(&monc->mutex);
1357 return ret;
1358}
1359EXPORT_SYMBOL(ceph_monc_validate_auth);
1360
1361static int mon_get_auth_request(struct ceph_connection *con,
1362 void *buf, int *buf_len,
1363 void **authorizer, int *authorizer_len)
1364{
1365 struct ceph_mon_client *monc = con->private;
1366 int ret;
1367
1368 mutex_lock(&monc->mutex);
1369 ret = ceph_auth_get_request(monc->auth, buf, *buf_len);
1370 mutex_unlock(&monc->mutex);
1371 if (ret < 0)
1372 return ret;
1373
1374 *buf_len = ret;
1375 *authorizer = NULL;
1376 *authorizer_len = 0;
1377 return 0;
1378}
1379
1380static int mon_handle_auth_reply_more(struct ceph_connection *con,
1381 void *reply, int reply_len,
1382 void *buf, int *buf_len,
1383 void **authorizer, int *authorizer_len)
1384{
1385 struct ceph_mon_client *monc = con->private;
1386 int ret;
1387
1388 mutex_lock(&monc->mutex);
1389 ret = ceph_auth_handle_reply_more(monc->auth, reply, reply_len,
1390 buf, *buf_len);
1391 mutex_unlock(&monc->mutex);
1392 if (ret < 0)
1393 return ret;
1394
1395 *buf_len = ret;
1396 *authorizer = NULL;
1397 *authorizer_len = 0;
1398 return 0;
1399}
1400
1401static int mon_handle_auth_done(struct ceph_connection *con,
1402 u64 global_id, void *reply, int reply_len,
1403 u8 *session_key, int *session_key_len,
1404 u8 *con_secret, int *con_secret_len)
1405{
1406 struct ceph_mon_client *monc = con->private;
1407 bool was_authed;
1408 int ret;
1409
1410 mutex_lock(&monc->mutex);
1411 WARN_ON(!monc->hunting);
1412 was_authed = ceph_auth_is_authenticated(monc->auth);
1413 ret = ceph_auth_handle_reply_done(monc->auth, global_id,
1414 reply, reply_len,
1415 session_key, session_key_len,
1416 con_secret, con_secret_len);
1417 finish_auth(monc, ret, was_authed);
1418 if (!ret)
1419 finish_hunting(monc);
1420 mutex_unlock(&monc->mutex);
1421 return ret;
1422}
1423
1424static int mon_handle_auth_bad_method(struct ceph_connection *con,
1425 int used_proto, int result,
1426 const int *allowed_protos, int proto_cnt,
1427 const int *allowed_modes, int mode_cnt)
1428{
1429 struct ceph_mon_client *monc = con->private;
1430 bool was_authed;
1431
1432 mutex_lock(&monc->mutex);
1433 WARN_ON(!monc->hunting);
1434 was_authed = ceph_auth_is_authenticated(monc->auth);
1435 ceph_auth_handle_bad_method(monc->auth, used_proto, result,
1436 allowed_protos, proto_cnt,
1437 allowed_modes, mode_cnt);
1438 finish_auth(monc, -EACCES, was_authed);
1439 mutex_unlock(&monc->mutex);
1440 return 0;
1441}
1442
1443/*
1444 * handle incoming message
1445 */
1446static void mon_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1447{
1448 struct ceph_mon_client *monc = con->private;
1449 int type = le16_to_cpu(msg->hdr.type);
1450
1451 switch (type) {
1452 case CEPH_MSG_AUTH_REPLY:
1453 handle_auth_reply(monc, msg);
1454 break;
1455
1456 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1457 handle_subscribe_ack(monc, msg);
1458 break;
1459
1460 case CEPH_MSG_STATFS_REPLY:
1461 handle_statfs_reply(monc, msg);
1462 break;
1463
1464 case CEPH_MSG_MON_GET_VERSION_REPLY:
1465 handle_get_version_reply(monc, msg);
1466 break;
1467
1468 case CEPH_MSG_MON_COMMAND_ACK:
1469 handle_command_ack(monc, msg);
1470 break;
1471
1472 case CEPH_MSG_MON_MAP:
1473 ceph_monc_handle_map(monc, msg);
1474 break;
1475
1476 case CEPH_MSG_OSD_MAP:
1477 ceph_osdc_handle_map(&monc->client->osdc, msg);
1478 break;
1479
1480 default:
1481 /* can the chained handler handle it? */
1482 if (monc->client->extra_mon_dispatch &&
1483 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1484 break;
1485
1486 pr_err("received unknown message type %d %s\n", type,
1487 ceph_msg_type_name(type));
1488 }
1489 ceph_msg_put(msg);
1490}
1491
1492/*
1493 * Allocate memory for incoming message
1494 */
1495static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1496 struct ceph_msg_header *hdr,
1497 int *skip)
1498{
1499 struct ceph_mon_client *monc = con->private;
1500 int type = le16_to_cpu(hdr->type);
1501 int front_len = le32_to_cpu(hdr->front_len);
1502 struct ceph_msg *m = NULL;
1503
1504 *skip = 0;
1505
1506 switch (type) {
1507 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1508 m = ceph_msg_get(monc->m_subscribe_ack);
1509 break;
1510 case CEPH_MSG_STATFS_REPLY:
1511 case CEPH_MSG_MON_COMMAND_ACK:
1512 return get_generic_reply(con, hdr, skip);
1513 case CEPH_MSG_AUTH_REPLY:
1514 m = ceph_msg_get(monc->m_auth_reply);
1515 break;
1516 case CEPH_MSG_MON_GET_VERSION_REPLY:
1517 if (le64_to_cpu(hdr->tid) != 0)
1518 return get_generic_reply(con, hdr, skip);
1519
1520 /*
1521 * Older OSDs don't set reply tid even if the original
1522 * request had a non-zero tid. Work around this weirdness
1523 * by allocating a new message.
1524 */
1525 fallthrough;
1526 case CEPH_MSG_MON_MAP:
1527 case CEPH_MSG_MDS_MAP:
1528 case CEPH_MSG_OSD_MAP:
1529 case CEPH_MSG_FS_MAP_USER:
1530 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1531 if (!m)
1532 return NULL; /* ENOMEM--return skip == 0 */
1533 break;
1534 }
1535
1536 if (!m) {
1537 pr_info("alloc_msg unknown type %d\n", type);
1538 *skip = 1;
1539 } else if (front_len > m->front_alloc_len) {
1540 pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
1541 front_len, m->front_alloc_len,
1542 (unsigned int)con->peer_name.type,
1543 le64_to_cpu(con->peer_name.num));
1544 ceph_msg_put(m);
1545 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1546 }
1547
1548 return m;
1549}
1550
1551/*
1552 * If the monitor connection resets, pick a new monitor and resubmit
1553 * any pending requests.
1554 */
1555static void mon_fault(struct ceph_connection *con)
1556{
1557 struct ceph_mon_client *monc = con->private;
1558
1559 mutex_lock(&monc->mutex);
1560 dout("%s mon%d\n", __func__, monc->cur_mon);
1561 if (monc->cur_mon >= 0) {
1562 if (!monc->hunting) {
1563 dout("%s hunting for new mon\n", __func__);
1564 reopen_session(monc);
1565 __schedule_delayed(monc);
1566 } else {
1567 dout("%s already hunting\n", __func__);
1568 }
1569 }
1570 mutex_unlock(&monc->mutex);
1571}
1572
1573/*
1574 * We can ignore refcounting on the connection struct, as all references
1575 * will come from the messenger workqueue, which is drained prior to
1576 * mon_client destruction.
1577 */
1578static struct ceph_connection *mon_get_con(struct ceph_connection *con)
1579{
1580 return con;
1581}
1582
1583static void mon_put_con(struct ceph_connection *con)
1584{
1585}
1586
1587static const struct ceph_connection_operations mon_con_ops = {
1588 .get = mon_get_con,
1589 .put = mon_put_con,
1590 .alloc_msg = mon_alloc_msg,
1591 .dispatch = mon_dispatch,
1592 .fault = mon_fault,
1593 .get_auth_request = mon_get_auth_request,
1594 .handle_auth_reply_more = mon_handle_auth_reply_more,
1595 .handle_auth_done = mon_handle_auth_done,
1596 .handle_auth_bad_method = mon_handle_auth_bad_method,
1597};