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, v: 1, name: "mon_info_t", struct_v: &struct_v,
48 struct_len: &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, v: 6, name: "monmap", struct_v: &struct_v, struct_len: &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, v: 1, name: "mon_feature_t",
100 struct_v: &feat_struct_v, struct_len: &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, v: 1, name: "mon_feature_t",
107 struct_v: &feat_struct_v, struct_len: &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, addr: &inst->addr);
139 else
140 ret = ceph_decode_entity_addr(p, end, addr: &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(objp: monmap);
154 return ERR_PTR(error: 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(lhs: addr, rhs: &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(msg: monc->m_auth);
181 ceph_msg_get(msg: monc->m_auth); /* keep our ref */
182 ceph_con_send(con: &monc->con, msg: 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(msg: monc->m_auth);
192 ceph_msg_revoke_incoming(msg: monc->m_auth_reply);
193 ceph_msg_revoke(msg: monc->m_subscribe);
194 ceph_msg_revoke_incoming(msg: monc->m_subscribe_ack);
195 ceph_con_close(con: &monc->con);
196
197 monc->pending_auth = 0;
198 ceph_auth_reset(ac: 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(ceil: 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(con: &monc->con, CEPH_ENTITY_TYPE_MON, entity_num: monc->cur_mon,
257 addr: &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(con: &monc->con);
266 if (ceph_msgr2(client: monc->client)) {
267 monc->pending_auth = 1;
268 return;
269 }
270
271 /* initiate authentication handshake */
272 ret = ceph_auth_build_hello(ac: monc->auth,
273 buf: monc->m_auth->front.iov_base,
274 len: monc->m_auth->front_alloc_len);
275 BUG_ON(ret <= 0);
276 __send_prepared_auth_request(monc, len: 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(lock: &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(wq: system_percpu_wq, dwork: &monc->delayed_work,
318 delay: round_jiffies_relative(j: 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: &p, v: 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, fmt: "%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: buf + len, fmt: ".%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: &p, end, s: 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(con: &monc->con, msg: 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(lock: &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(lock: &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(lock: &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(lock: &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(lock: &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(lock: &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, sub: CEPH_SUB_MONMAP, epoch: 0, continuous: true);
531 __ceph_monc_want_map(monc, sub: CEPH_SUB_OSDMAP, epoch: 0, continuous: false);
532 __open_session(monc);
533 __schedule_delayed(monc);
534 mutex_unlock(lock: &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: &p, end, msgr2: ceph_msgr2(client));
553 if (IS_ERR(ptr: 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, fsid: &monmap->fsid) < 0) {
561 kfree(objp: monmap);
562 goto out;
563 }
564
565 kfree(objp: monc->monmap);
566 monc->monmap = monmap;
567
568 __ceph_monc_got_map(monc, sub: CEPH_SUB_MONMAP, epoch: monc->monmap->epoch);
569 client->have_fsid = true;
570
571out:
572 mutex_unlock(lock: &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(msg: req->reply);
592 if (req->request)
593 ceph_msg_put(msg: req->request);
594
595 kfree(objp: req);
596}
597
598static void put_generic_request(struct ceph_mon_generic_request *req)
599{
600 if (req)
601 kref_put(kref: &req->kref, release: release_generic_request);
602}
603
604static void get_generic_request(struct ceph_mon_generic_request *req)
605{
606 kref_get(kref: &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(kref: &req->kref);
620 RB_CLEAR_NODE(&req->node);
621 init_completion(x: &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(root: &monc->generic_request_tree, t: 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(con: &monc->con, msg: ceph_msg_get(msg: 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(root: &monc->generic_request_tree, t: req);
654
655 ceph_msg_revoke(msg: req->request);
656 ceph_msg_revoke_incoming(msg: 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(root: &monc->generic_request_tree,
683 key: req->tid);
684 if (lookup_req) {
685 WARN_ON(lookup_req != req);
686 finish_generic_request(req);
687 }
688
689 mutex_unlock(lock: &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(x: &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(root: &monc->generic_request_tree, key: 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(msg: 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(lock: &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(root: &monc->generic_request_tree, key: tid);
752 if (!req) {
753 mutex_unlock(lock: &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(lock: &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, front_len: sizeof(*h), GFP_NOFS,
785 can_fail: true);
786 if (!req->request)
787 goto out;
788
789 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, front_len: 64, GFP_NOFS, can_fail: 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(lock: &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: &p);
829 if (tid != 0 && tid != handle)
830 goto bad;
831
832 mutex_lock(&monc->mutex);
833 req = lookup_generic_request(root: &monc->generic_request_tree, key: handle);
834 if (!req) {
835 mutex_unlock(lock: &monc->mutex);
836 return;
837 }
838
839 req->result = 0;
840 req->u.newest = ceph_decode_64(p: &p);
841 __finish_generic_request(req);
842 mutex_unlock(lock: &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 front_len: sizeof(u64) + sizeof(u32) + strlen(what),
864 GFP_NOIO, can_fail: true);
865 if (!req->request)
866 goto err_put_req;
867
868 req->reply = ceph_msg_new(CEPH_MSG_MON_GET_VERSION_REPLY, front_len: 32, GFP_NOIO,
869 can_fail: 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: &p, v: req->tid); /* handle */
883 ceph_encode_string(p: &p, end, s: what, strlen(what));
884 WARN_ON(p != end);
885 }
886 send_generic_request(monc, req);
887 mutex_unlock(lock: &monc->mutex);
888
889 return req;
890
891err_put_req:
892 put_generic_request(req);
893 return ERR_PTR(error: -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, private_data: 0);
908 if (IS_ERR(ptr: req))
909 return PTR_ERR(ptr: 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(ptr: req))
932 return PTR_ERR(ptr: 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(root: &monc->generic_request_tree, key: tid);
955 if (!req) {
956 mutex_unlock(lock: &monc->mutex);
957 return;
958 }
959
960 req->result = ceph_decode_32(p: &p);
961 __finish_generic_request(req);
962 mutex_unlock(lock: &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, front_len: 256, GFP_NOIO, can_fail: true);
986 if (!req->request)
987 goto out;
988
989 req->reply = ceph_msg_new(CEPH_MSG_MON_COMMAND_ACK, front_len: 512, GFP_NOIO,
990 can_fail: 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(buf: h->str, fmt, ap);
1003 h->str_len = cpu_to_le32(len);
1004 send_generic_request(monc, req);
1005 mutex_unlock(lock: &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 fmt: "{ \"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 fmt: "{ \"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(client: monc->client, timeout: 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(root: &monc->generic_request_tree); p; p = rb_next(p)) {
1071 req = rb_entry(p, struct ceph_mon_generic_request, node);
1072 ceph_msg_revoke(msg: req->request);
1073 ceph_msg_revoke_incoming(msg: req->reply);
1074 ceph_con_send(con: &monc->con, msg: ceph_msg_get(msg: 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 mutex_lock(&monc->mutex);
1089 dout("%s mon%d\n", __func__, monc->cur_mon);
1090 if (monc->cur_mon < 0) {
1091 goto out;
1092 }
1093
1094 if (monc->hunting) {
1095 dout("%s continuing hunt\n", __func__);
1096 reopen_session(monc);
1097 } else {
1098 int is_auth = ceph_auth_is_authenticated(ac: monc->auth);
1099
1100 dout("%s is_authed %d\n", __func__, is_auth);
1101 if (ceph_con_keepalive_expired(con: &monc->con,
1102 CEPH_MONC_PING_TIMEOUT)) {
1103 dout("monc keepalive timeout\n");
1104 is_auth = 0;
1105 reopen_session(monc);
1106 }
1107
1108 if (!monc->hunting) {
1109 ceph_con_keepalive(con: &monc->con);
1110 __validate_auth(monc);
1111 un_backoff(monc);
1112 }
1113
1114 if (is_auth &&
1115 !(monc->con.peer_features & CEPH_FEATURE_MON_STATEFUL_SUB)) {
1116 unsigned long now = jiffies;
1117
1118 dout("%s renew subs? now %lu renew after %lu\n",
1119 __func__, now, monc->sub_renew_after);
1120 if (time_after_eq(now, monc->sub_renew_after))
1121 __send_subscribe(monc);
1122 }
1123 }
1124 __schedule_delayed(monc);
1125
1126out:
1127 mutex_unlock(lock: &monc->mutex);
1128}
1129
1130/*
1131 * On startup, we build a temporary monmap populated with the IPs
1132 * provided by mount(2).
1133 */
1134static int build_initial_monmap(struct ceph_mon_client *monc)
1135{
1136 __le32 my_type = ceph_msgr2(client: monc->client) ?
1137 CEPH_ENTITY_ADDR_TYPE_MSGR2 : CEPH_ENTITY_ADDR_TYPE_LEGACY;
1138 struct ceph_options *opt = monc->client->options;
1139 int num_mon = opt->num_mon;
1140 int i;
1141
1142 /* build initial monmap */
1143 monc->monmap = kzalloc(struct_size(monc->monmap, mon_inst, num_mon),
1144 GFP_KERNEL);
1145 if (!monc->monmap)
1146 return -ENOMEM;
1147 monc->monmap->num_mon = num_mon;
1148
1149 for (i = 0; i < num_mon; i++) {
1150 struct ceph_entity_inst *inst = &monc->monmap->mon_inst[i];
1151
1152 memcpy(&inst->addr.in_addr, &opt->mon_addr[i].in_addr,
1153 sizeof(inst->addr.in_addr));
1154 inst->addr.type = my_type;
1155 inst->addr.nonce = 0;
1156 inst->name.type = CEPH_ENTITY_TYPE_MON;
1157 inst->name.num = cpu_to_le64(i);
1158 }
1159 return 0;
1160}
1161
1162int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
1163{
1164 int err;
1165
1166 dout("init\n");
1167 memset(monc, 0, sizeof(*monc));
1168 monc->client = cl;
1169 mutex_init(&monc->mutex);
1170
1171 err = build_initial_monmap(monc);
1172 if (err)
1173 goto out;
1174
1175 /* connection */
1176 /* authentication */
1177 monc->auth = ceph_auth_init(name: cl->options->name, key: cl->options->key,
1178 con_modes: cl->options->con_modes);
1179 if (IS_ERR(ptr: monc->auth)) {
1180 err = PTR_ERR(ptr: monc->auth);
1181 goto out_monmap;
1182 }
1183 monc->auth->want_keys =
1184 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
1185 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
1186
1187 /* msgs */
1188 err = -ENOMEM;
1189 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
1190 front_len: sizeof(struct ceph_mon_subscribe_ack),
1191 GFP_KERNEL, can_fail: true);
1192 if (!monc->m_subscribe_ack)
1193 goto out_auth;
1194
1195 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, front_len: 128,
1196 GFP_KERNEL, can_fail: true);
1197 if (!monc->m_subscribe)
1198 goto out_subscribe_ack;
1199
1200 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, front_len: 4096,
1201 GFP_KERNEL, can_fail: true);
1202 if (!monc->m_auth_reply)
1203 goto out_subscribe;
1204
1205 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, front_len: 4096, GFP_KERNEL, can_fail: true);
1206 monc->pending_auth = 0;
1207 if (!monc->m_auth)
1208 goto out_auth_reply;
1209
1210 ceph_con_init(con: &monc->con, private: monc, ops: &mon_con_ops,
1211 msgr: &monc->client->msgr);
1212
1213 monc->cur_mon = -1;
1214 monc->had_a_connection = false;
1215 monc->hunt_mult = 1;
1216
1217 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
1218 monc->generic_request_tree = RB_ROOT;
1219 monc->last_tid = 0;
1220
1221 monc->fs_cluster_id = CEPH_FS_CLUSTER_ID_NONE;
1222
1223 return 0;
1224
1225out_auth_reply:
1226 ceph_msg_put(msg: monc->m_auth_reply);
1227out_subscribe:
1228 ceph_msg_put(msg: monc->m_subscribe);
1229out_subscribe_ack:
1230 ceph_msg_put(msg: monc->m_subscribe_ack);
1231out_auth:
1232 ceph_auth_destroy(ac: monc->auth);
1233out_monmap:
1234 kfree(objp: monc->monmap);
1235out:
1236 return err;
1237}
1238EXPORT_SYMBOL(ceph_monc_init);
1239
1240void ceph_monc_stop(struct ceph_mon_client *monc)
1241{
1242 dout("stop\n");
1243
1244 mutex_lock(&monc->mutex);
1245 __close_session(monc);
1246 monc->hunting = false;
1247 monc->cur_mon = -1;
1248 mutex_unlock(lock: &monc->mutex);
1249
1250 cancel_delayed_work_sync(dwork: &monc->delayed_work);
1251
1252 /*
1253 * flush msgr queue before we destroy ourselves to ensure that:
1254 * - any work that references our embedded con is finished.
1255 * - any osd_client or other work that may reference an authorizer
1256 * finishes before we shut down the auth subsystem.
1257 */
1258 ceph_msgr_flush();
1259
1260 ceph_auth_destroy(ac: monc->auth);
1261
1262 WARN_ON(!RB_EMPTY_ROOT(&monc->generic_request_tree));
1263
1264 ceph_msg_put(msg: monc->m_auth);
1265 ceph_msg_put(msg: monc->m_auth_reply);
1266 ceph_msg_put(msg: monc->m_subscribe);
1267 ceph_msg_put(msg: monc->m_subscribe_ack);
1268
1269 kfree(objp: monc->monmap);
1270}
1271EXPORT_SYMBOL(ceph_monc_stop);
1272
1273static void finish_hunting(struct ceph_mon_client *monc)
1274{
1275 if (monc->hunting) {
1276 dout("%s found mon%d\n", __func__, monc->cur_mon);
1277 monc->hunting = false;
1278 monc->had_a_connection = true;
1279 un_backoff(monc);
1280 __schedule_delayed(monc);
1281 }
1282}
1283
1284static void finish_auth(struct ceph_mon_client *monc, int auth_err,
1285 bool was_authed)
1286{
1287 dout("%s auth_err %d was_authed %d\n", __func__, auth_err, was_authed);
1288 WARN_ON(auth_err > 0);
1289
1290 monc->pending_auth = 0;
1291 if (auth_err) {
1292 monc->client->auth_err = auth_err;
1293 wake_up_all(&monc->client->auth_wq);
1294 return;
1295 }
1296
1297 if (!was_authed && ceph_auth_is_authenticated(ac: monc->auth)) {
1298 dout("%s authenticated, starting session global_id %llu\n",
1299 __func__, monc->auth->global_id);
1300
1301 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
1302 monc->client->msgr.inst.name.num =
1303 cpu_to_le64(monc->auth->global_id);
1304
1305 __send_subscribe(monc);
1306 __resend_generic_request(monc);
1307
1308 pr_info("mon%d %s session established\n", monc->cur_mon,
1309 ceph_pr_addr(&monc->con.peer_addr));
1310 }
1311}
1312
1313static void handle_auth_reply(struct ceph_mon_client *monc,
1314 struct ceph_msg *msg)
1315{
1316 bool was_authed;
1317 int ret;
1318
1319 mutex_lock(&monc->mutex);
1320 was_authed = ceph_auth_is_authenticated(ac: monc->auth);
1321 ret = ceph_handle_auth_reply(ac: monc->auth, buf: msg->front.iov_base,
1322 len: msg->front.iov_len,
1323 reply_buf: monc->m_auth->front.iov_base,
1324 reply_len: monc->m_auth->front_alloc_len);
1325 if (ret > 0) {
1326 __send_prepared_auth_request(monc, len: ret);
1327 } else {
1328 finish_auth(monc, auth_err: ret, was_authed);
1329 finish_hunting(monc);
1330 }
1331 mutex_unlock(lock: &monc->mutex);
1332}
1333
1334static int __validate_auth(struct ceph_mon_client *monc)
1335{
1336 int ret;
1337
1338 if (monc->pending_auth)
1339 return 0;
1340
1341 ret = ceph_build_auth(ac: monc->auth, msg_buf: monc->m_auth->front.iov_base,
1342 msg_len: monc->m_auth->front_alloc_len);
1343 if (ret <= 0)
1344 return ret; /* either an error, or no need to authenticate */
1345 __send_prepared_auth_request(monc, len: ret);
1346 return 0;
1347}
1348
1349int ceph_monc_validate_auth(struct ceph_mon_client *monc)
1350{
1351 int ret;
1352
1353 mutex_lock(&monc->mutex);
1354 ret = __validate_auth(monc);
1355 mutex_unlock(lock: &monc->mutex);
1356 return ret;
1357}
1358EXPORT_SYMBOL(ceph_monc_validate_auth);
1359
1360static int mon_get_auth_request(struct ceph_connection *con,
1361 void *buf, int *buf_len,
1362 void **authorizer, int *authorizer_len)
1363{
1364 struct ceph_mon_client *monc = con->private;
1365 int ret;
1366
1367 mutex_lock(&monc->mutex);
1368 ret = ceph_auth_get_request(ac: monc->auth, buf, buf_len: *buf_len);
1369 mutex_unlock(lock: &monc->mutex);
1370 if (ret < 0)
1371 return ret;
1372
1373 *buf_len = ret;
1374 *authorizer = NULL;
1375 *authorizer_len = 0;
1376 return 0;
1377}
1378
1379static int mon_handle_auth_reply_more(struct ceph_connection *con,
1380 void *reply, int reply_len,
1381 void *buf, int *buf_len,
1382 void **authorizer, int *authorizer_len)
1383{
1384 struct ceph_mon_client *monc = con->private;
1385 int ret;
1386
1387 mutex_lock(&monc->mutex);
1388 ret = ceph_auth_handle_reply_more(ac: monc->auth, reply, reply_len,
1389 buf, buf_len: *buf_len);
1390 mutex_unlock(lock: &monc->mutex);
1391 if (ret < 0)
1392 return ret;
1393
1394 *buf_len = ret;
1395 *authorizer = NULL;
1396 *authorizer_len = 0;
1397 return 0;
1398}
1399
1400static int mon_handle_auth_done(struct ceph_connection *con,
1401 u64 global_id, void *reply, int reply_len,
1402 u8 *session_key, int *session_key_len,
1403 u8 *con_secret, int *con_secret_len)
1404{
1405 struct ceph_mon_client *monc = con->private;
1406 bool was_authed;
1407 int ret;
1408
1409 mutex_lock(&monc->mutex);
1410 WARN_ON(!monc->hunting);
1411 was_authed = ceph_auth_is_authenticated(ac: monc->auth);
1412 ret = ceph_auth_handle_reply_done(ac: monc->auth, global_id,
1413 reply, reply_len,
1414 session_key, session_key_len,
1415 con_secret, con_secret_len);
1416 finish_auth(monc, auth_err: ret, was_authed);
1417 if (!ret)
1418 finish_hunting(monc);
1419 mutex_unlock(lock: &monc->mutex);
1420 return ret;
1421}
1422
1423static int mon_handle_auth_bad_method(struct ceph_connection *con,
1424 int used_proto, int result,
1425 const int *allowed_protos, int proto_cnt,
1426 const int *allowed_modes, int mode_cnt)
1427{
1428 struct ceph_mon_client *monc = con->private;
1429 bool was_authed;
1430
1431 mutex_lock(&monc->mutex);
1432 WARN_ON(!monc->hunting);
1433 was_authed = ceph_auth_is_authenticated(ac: monc->auth);
1434 ceph_auth_handle_bad_method(ac: monc->auth, used_proto, result,
1435 allowed_protos, proto_cnt,
1436 allowed_modes, mode_cnt);
1437 finish_auth(monc, auth_err: -EACCES, was_authed);
1438 mutex_unlock(lock: &monc->mutex);
1439 return 0;
1440}
1441
1442/*
1443 * handle incoming message
1444 */
1445static void mon_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1446{
1447 struct ceph_mon_client *monc = con->private;
1448 int type = le16_to_cpu(msg->hdr.type);
1449
1450 switch (type) {
1451 case CEPH_MSG_AUTH_REPLY:
1452 handle_auth_reply(monc, msg);
1453 break;
1454
1455 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1456 handle_subscribe_ack(monc, msg);
1457 break;
1458
1459 case CEPH_MSG_STATFS_REPLY:
1460 handle_statfs_reply(monc, msg);
1461 break;
1462
1463 case CEPH_MSG_MON_GET_VERSION_REPLY:
1464 handle_get_version_reply(monc, msg);
1465 break;
1466
1467 case CEPH_MSG_MON_COMMAND_ACK:
1468 handle_command_ack(monc, msg);
1469 break;
1470
1471 case CEPH_MSG_MON_MAP:
1472 ceph_monc_handle_map(monc, msg);
1473 break;
1474
1475 case CEPH_MSG_OSD_MAP:
1476 ceph_osdc_handle_map(osdc: &monc->client->osdc, msg);
1477 break;
1478
1479 default:
1480 /* can the chained handler handle it? */
1481 if (monc->client->extra_mon_dispatch &&
1482 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1483 break;
1484
1485 pr_err("received unknown message type %d %s\n", type,
1486 ceph_msg_type_name(type));
1487 }
1488 ceph_msg_put(msg);
1489}
1490
1491/*
1492 * Allocate memory for incoming message
1493 */
1494static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1495 struct ceph_msg_header *hdr,
1496 int *skip)
1497{
1498 struct ceph_mon_client *monc = con->private;
1499 int type = le16_to_cpu(hdr->type);
1500 int front_len = le32_to_cpu(hdr->front_len);
1501 struct ceph_msg *m = NULL;
1502
1503 *skip = 0;
1504
1505 switch (type) {
1506 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1507 m = ceph_msg_get(msg: monc->m_subscribe_ack);
1508 break;
1509 case CEPH_MSG_STATFS_REPLY:
1510 case CEPH_MSG_MON_COMMAND_ACK:
1511 return get_generic_reply(con, hdr, skip);
1512 case CEPH_MSG_AUTH_REPLY:
1513 m = ceph_msg_get(msg: monc->m_auth_reply);
1514 break;
1515 case CEPH_MSG_MON_GET_VERSION_REPLY:
1516 if (le64_to_cpu(hdr->tid) != 0)
1517 return get_generic_reply(con, hdr, skip);
1518
1519 /*
1520 * Older OSDs don't set reply tid even if the original
1521 * request had a non-zero tid. Work around this weirdness
1522 * by allocating a new message.
1523 */
1524 fallthrough;
1525 case CEPH_MSG_MON_MAP:
1526 case CEPH_MSG_MDS_MAP:
1527 case CEPH_MSG_OSD_MAP:
1528 case CEPH_MSG_FS_MAP_USER:
1529 m = ceph_msg_new(type, front_len, GFP_NOFS, can_fail: false);
1530 if (!m)
1531 return NULL; /* ENOMEM--return skip == 0 */
1532 break;
1533 }
1534
1535 if (!m) {
1536 pr_info("alloc_msg unknown type %d\n", type);
1537 *skip = 1;
1538 } else if (front_len > m->front_alloc_len) {
1539 pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
1540 front_len, m->front_alloc_len,
1541 (unsigned int)con->peer_name.type,
1542 le64_to_cpu(con->peer_name.num));
1543 ceph_msg_put(msg: m);
1544 m = ceph_msg_new(type, front_len, GFP_NOFS, can_fail: false);
1545 }
1546
1547 return m;
1548}
1549
1550/*
1551 * If the monitor connection resets, pick a new monitor and resubmit
1552 * any pending requests.
1553 */
1554static void mon_fault(struct ceph_connection *con)
1555{
1556 struct ceph_mon_client *monc = con->private;
1557
1558 mutex_lock(&monc->mutex);
1559 dout("%s mon%d\n", __func__, monc->cur_mon);
1560 if (monc->cur_mon >= 0) {
1561 if (!monc->hunting) {
1562 dout("%s hunting for new mon\n", __func__);
1563 reopen_session(monc);
1564 __schedule_delayed(monc);
1565 } else {
1566 dout("%s already hunting\n", __func__);
1567 }
1568 }
1569 mutex_unlock(lock: &monc->mutex);
1570}
1571
1572/*
1573 * We can ignore refcounting on the connection struct, as all references
1574 * will come from the messenger workqueue, which is drained prior to
1575 * mon_client destruction.
1576 */
1577static struct ceph_connection *mon_get_con(struct ceph_connection *con)
1578{
1579 return con;
1580}
1581
1582static void mon_put_con(struct ceph_connection *con)
1583{
1584}
1585
1586static const struct ceph_connection_operations mon_con_ops = {
1587 .get = mon_get_con,
1588 .put = mon_put_con,
1589 .alloc_msg = mon_alloc_msg,
1590 .dispatch = mon_dispatch,
1591 .fault = mon_fault,
1592 .get_auth_request = mon_get_auth_request,
1593 .handle_auth_reply_more = mon_handle_auth_reply_more,
1594 .handle_auth_done = mon_handle_auth_done,
1595 .handle_auth_bad_method = mon_handle_auth_bad_method,
1596};
1597

source code of linux/net/ceph/mon_client.c