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Merge tag 'mfd-fixes-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
[linux/fpc-iii.git] / net / ceph / mon_client.c
blobd633a0aeaa5525f8196eaa7881d258da402ba5d2
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
35 static const struct ceph_connection_operations mon_con_ops;
36
37 static int __validate_auth(struct ceph_mon_client *monc);
38
39 /*
40 * Decode a monmap blob (e.g., during mount).
41 */
42 static struct ceph_monmap *ceph_monmap_decode(void *p, void *end)
43 {
44 struct ceph_monmap *m = NULL;
45 int i, err = -EINVAL;
46 struct ceph_fsid fsid;
47 u32 epoch, num_mon;
48 u32 len;
49
50 ceph_decode_32_safe(&p, end, len, bad);
51 ceph_decode_need(&p, end, len, bad);
52
53 dout("monmap_decode %p %p len %d (%d)\n", p, end, len, (int)(end-p));
54 p += sizeof(u16); /* skip version */
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
62 if (num_mon > CEPH_MAX_MON)
63 goto bad;
64 m = kmalloc(struct_size(m, mon_inst, num_mon), GFP_NOFS);
65 if (m == NULL)
66 return ERR_PTR(-ENOMEM);
67 m->fsid = fsid;
68 m->epoch = epoch;
69 m->num_mon = num_mon;
70 for (i = 0; i < num_mon; ++i) {
71 struct ceph_entity_inst *inst = &m->mon_inst[i];
72
73 /* copy name portion */
74 ceph_decode_copy_safe(&p, end, &inst->name,
75 sizeof(inst->name), bad);
76 err = ceph_decode_entity_addr(&p, end, &inst->addr);
77 if (err)
78 goto bad;
79 }
80 dout("monmap_decode epoch %d, num_mon %d\n", m->epoch,
81 m->num_mon);
82 for (i = 0; i < m->num_mon; i++)
83 dout("monmap_decode mon%d is %s\n", i,
84 ceph_pr_addr(&m->mon_inst[i].addr));
85 return m;
86 bad:
87 dout("monmap_decode failed with %d\n", err);
88 kfree(m);
89 return ERR_PTR(err);
90 }
91
92 /*
93 * return true if *addr is included in the monmap.
94 */
95 int ceph_monmap_contains(struct ceph_monmap *m, struct ceph_entity_addr *addr)
96 {
97 int i;
98
99 for (i = 0; i < m->num_mon; i++)
100 if (memcmp(addr, &m->mon_inst[i].addr, sizeof(*addr)) == 0)
101 return 1;
102 return 0;
103 }
104
105 /*
106 * Send an auth request.
107 */
108 static void __send_prepared_auth_request(struct ceph_mon_client *monc, int len)
109 {
110 monc->pending_auth = 1;
111 monc->m_auth->front.iov_len = len;
112 monc->m_auth->hdr.front_len = cpu_to_le32(len);
113 ceph_msg_revoke(monc->m_auth);
114 ceph_msg_get(monc->m_auth); /* keep our ref */
115 ceph_con_send(&monc->con, monc->m_auth);
116 }
117
118 /*
119 * Close monitor session, if any.
120 */
121 static void __close_session(struct ceph_mon_client *monc)
122 {
123 dout("__close_session closing mon%d\n", monc->cur_mon);
124 ceph_msg_revoke(monc->m_auth);
125 ceph_msg_revoke_incoming(monc->m_auth_reply);
126 ceph_msg_revoke(monc->m_subscribe);
127 ceph_msg_revoke_incoming(monc->m_subscribe_ack);
128 ceph_con_close(&monc->con);
129
130 monc->pending_auth = 0;
131 ceph_auth_reset(monc->auth);
132 }
133
134 /*
135 * Pick a new monitor at random and set cur_mon. If we are repicking
136 * (i.e. cur_mon is already set), be sure to pick a different one.
137 */
138 static void pick_new_mon(struct ceph_mon_client *monc)
139 {
140 int old_mon = monc->cur_mon;
141
142 BUG_ON(monc->monmap->num_mon < 1);
143
144 if (monc->monmap->num_mon == 1) {
145 monc->cur_mon = 0;
146 } else {
147 int max = monc->monmap->num_mon;
148 int o = -1;
149 int n;
150
151 if (monc->cur_mon >= 0) {
152 if (monc->cur_mon < monc->monmap->num_mon)
153 o = monc->cur_mon;
154 if (o >= 0)
155 max--;
156 }
157
158 n = prandom_u32() % max;
159 if (o >= 0 && n >= o)
160 n++;
161
162 monc->cur_mon = n;
163 }
164
165 dout("%s mon%d -> mon%d out of %d mons\n", __func__, old_mon,
166 monc->cur_mon, monc->monmap->num_mon);
167 }
168
169 /*
170 * Open a session with a new monitor.
171 */
172 static void __open_session(struct ceph_mon_client *monc)
173 {
174 int ret;
175
176 pick_new_mon(monc);
177
178 monc->hunting = true;
179 if (monc->had_a_connection) {
180 monc->hunt_mult *= CEPH_MONC_HUNT_BACKOFF;
181 if (monc->hunt_mult > CEPH_MONC_HUNT_MAX_MULT)
182 monc->hunt_mult = CEPH_MONC_HUNT_MAX_MULT;
183 }
184
185 monc->sub_renew_after = jiffies; /* i.e., expired */
186 monc->sub_renew_sent = 0;
187
188 dout("%s opening mon%d\n", __func__, monc->cur_mon);
189 ceph_con_open(&monc->con, CEPH_ENTITY_TYPE_MON, monc->cur_mon,
190 &monc->monmap->mon_inst[monc->cur_mon].addr);
191
192 /*
193 * send an initial keepalive to ensure our timestamp is valid
194 * by the time we are in an OPENED state
195 */
196 ceph_con_keepalive(&monc->con);
197
198 /* initiate authentication handshake */
199 ret = ceph_auth_build_hello(monc->auth,
200 monc->m_auth->front.iov_base,
201 monc->m_auth->front_alloc_len);
202 BUG_ON(ret <= 0);
203 __send_prepared_auth_request(monc, ret);
204 }
205
206 static void reopen_session(struct ceph_mon_client *monc)
207 {
208 if (!monc->hunting)
209 pr_info("mon%d %s session lost, hunting for new mon\n",
210 monc->cur_mon, ceph_pr_addr(&monc->con.peer_addr));
211
212 __close_session(monc);
213 __open_session(monc);
214 }
215
216 void ceph_monc_reopen_session(struct ceph_mon_client *monc)
217 {
218 mutex_lock(&monc->mutex);
219 reopen_session(monc);
220 mutex_unlock(&monc->mutex);
221 }
222
223 static void un_backoff(struct ceph_mon_client *monc)
224 {
225 monc->hunt_mult /= 2; /* reduce by 50% */
226 if (monc->hunt_mult < 1)
227 monc->hunt_mult = 1;
228 dout("%s hunt_mult now %d\n", __func__, monc->hunt_mult);
229 }
230
231 /*
232 * Reschedule delayed work timer.
233 */
234 static void __schedule_delayed(struct ceph_mon_client *monc)
235 {
236 unsigned long delay;
237
238 if (monc->hunting)
239 delay = CEPH_MONC_HUNT_INTERVAL * monc->hunt_mult;
240 else
241 delay = CEPH_MONC_PING_INTERVAL;
242
243 dout("__schedule_delayed after %lu\n", delay);
244 mod_delayed_work(system_wq, &monc->delayed_work,
245 round_jiffies_relative(delay));
246 }
247
248 const char *ceph_sub_str[] = {
249 [CEPH_SUB_MONMAP] = "monmap",
250 [CEPH_SUB_OSDMAP] = "osdmap",
251 [CEPH_SUB_FSMAP] = "fsmap.user",
252 [CEPH_SUB_MDSMAP] = "mdsmap",
253 };
254
255 /*
256 * Send subscribe request for one or more maps, according to
257 * monc->subs.
258 */
259 static void __send_subscribe(struct ceph_mon_client *monc)
260 {
261 struct ceph_msg *msg = monc->m_subscribe;
262 void *p = msg->front.iov_base;
263 void *const end = p + msg->front_alloc_len;
264 int num = 0;
265 int i;
266
267 dout("%s sent %lu\n", __func__, monc->sub_renew_sent);
268
269 BUG_ON(monc->cur_mon < 0);
270
271 if (!monc->sub_renew_sent)
272 monc->sub_renew_sent = jiffies | 1; /* never 0 */
273
274 msg->hdr.version = cpu_to_le16(2);
275
276 for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
277 if (monc->subs[i].want)
278 num++;
279 }
280 BUG_ON(num < 1); /* monmap sub is always there */
281 ceph_encode_32(&p, num);
282 for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
283 char buf[32];
284 int len;
285
286 if (!monc->subs[i].want)
287 continue;
288
289 len = sprintf(buf, "%s", ceph_sub_str[i]);
290 if (i == CEPH_SUB_MDSMAP &&
291 monc->fs_cluster_id != CEPH_FS_CLUSTER_ID_NONE)
292 len += sprintf(buf + len, ".%d", monc->fs_cluster_id);
293
294 dout("%s %s start %llu flags 0x%x\n", __func__, buf,
295 le64_to_cpu(monc->subs[i].item.start),
296 monc->subs[i].item.flags);
297 ceph_encode_string(&p, end, buf, len);
298 memcpy(p, &monc->subs[i].item, sizeof(monc->subs[i].item));
299 p += sizeof(monc->subs[i].item);
300 }
301
302 BUG_ON(p > end);
303 msg->front.iov_len = p - msg->front.iov_base;
304 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
305 ceph_msg_revoke(msg);
306 ceph_con_send(&monc->con, ceph_msg_get(msg));
307 }
308
309 static void handle_subscribe_ack(struct ceph_mon_client *monc,
310 struct ceph_msg *msg)
311 {
312 unsigned int seconds;
313 struct ceph_mon_subscribe_ack *h = msg->front.iov_base;
314
315 if (msg->front.iov_len < sizeof(*h))
316 goto bad;
317 seconds = le32_to_cpu(h->duration);
318
319 mutex_lock(&monc->mutex);
320 if (monc->sub_renew_sent) {
321 /*
322 * This is only needed for legacy (infernalis or older)
323 * MONs -- see delayed_work().
324 */
325 monc->sub_renew_after = monc->sub_renew_sent +
326 (seconds >> 1) * HZ - 1;
327 dout("%s sent %lu duration %d renew after %lu\n", __func__,
328 monc->sub_renew_sent, seconds, monc->sub_renew_after);
329 monc->sub_renew_sent = 0;
330 } else {
331 dout("%s sent %lu renew after %lu, ignoring\n", __func__,
332 monc->sub_renew_sent, monc->sub_renew_after);
333 }
334 mutex_unlock(&monc->mutex);
335 return;
336 bad:
337 pr_err("got corrupt subscribe-ack msg\n");
338 ceph_msg_dump(msg);
339 }
340
341 /*
342 * Register interest in a map
343 *
344 * @sub: one of CEPH_SUB_*
345 * @epoch: X for "every map since X", or 0 for "just the latest"
346 */
347 static bool __ceph_monc_want_map(struct ceph_mon_client *monc, int sub,
348 u32 epoch, bool continuous)
349 {
350 __le64 start = cpu_to_le64(epoch);
351 u8 flags = !continuous ? CEPH_SUBSCRIBE_ONETIME : 0;
352
353 dout("%s %s epoch %u continuous %d\n", __func__, ceph_sub_str[sub],
354 epoch, continuous);
355
356 if (monc->subs[sub].want &&
357 monc->subs[sub].item.start == start &&
358 monc->subs[sub].item.flags == flags)
359 return false;
360
361 monc->subs[sub].item.start = start;
362 monc->subs[sub].item.flags = flags;
363 monc->subs[sub].want = true;
364
365 return true;
366 }
367
368 bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
369 bool continuous)
370 {
371 bool need_request;
372
373 mutex_lock(&monc->mutex);
374 need_request = __ceph_monc_want_map(monc, sub, epoch, continuous);
375 mutex_unlock(&monc->mutex);
376
377 return need_request;
378 }
379 EXPORT_SYMBOL(ceph_monc_want_map);
380
381 /*
382 * Keep track of which maps we have
383 *
384 * @sub: one of CEPH_SUB_*
385 */
386 static void __ceph_monc_got_map(struct ceph_mon_client *monc, int sub,
387 u32 epoch)
388 {
389 dout("%s %s epoch %u\n", __func__, ceph_sub_str[sub], epoch);
390
391 if (monc->subs[sub].want) {
392 if (monc->subs[sub].item.flags & CEPH_SUBSCRIBE_ONETIME)
393 monc->subs[sub].want = false;
394 else
395 monc->subs[sub].item.start = cpu_to_le64(epoch + 1);
396 }
397
398 monc->subs[sub].have = epoch;
399 }
400
401 void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch)
402 {
403 mutex_lock(&monc->mutex);
404 __ceph_monc_got_map(monc, sub, epoch);
405 mutex_unlock(&monc->mutex);
406 }
407 EXPORT_SYMBOL(ceph_monc_got_map);
408
409 void ceph_monc_renew_subs(struct ceph_mon_client *monc)
410 {
411 mutex_lock(&monc->mutex);
412 __send_subscribe(monc);
413 mutex_unlock(&monc->mutex);
414 }
415 EXPORT_SYMBOL(ceph_monc_renew_subs);
416
417 /*
418 * Wait for an osdmap with a given epoch.
419 *
420 * @epoch: epoch to wait for
421 * @timeout: in jiffies, 0 means "wait forever"
422 */
423 int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
424 unsigned long timeout)
425 {
426 unsigned long started = jiffies;
427 long ret;
428
429 mutex_lock(&monc->mutex);
430 while (monc->subs[CEPH_SUB_OSDMAP].have < epoch) {
431 mutex_unlock(&monc->mutex);
432
433 if (timeout && time_after_eq(jiffies, started + timeout))
434 return -ETIMEDOUT;
435
436 ret = wait_event_interruptible_timeout(monc->client->auth_wq,
437 monc->subs[CEPH_SUB_OSDMAP].have >= epoch,
438 ceph_timeout_jiffies(timeout));
439 if (ret < 0)
440 return ret;
441
442 mutex_lock(&monc->mutex);
443 }
444
445 mutex_unlock(&monc->mutex);
446 return 0;
447 }
448 EXPORT_SYMBOL(ceph_monc_wait_osdmap);
449
450 /*
451 * Open a session with a random monitor. Request monmap and osdmap,
452 * which are waited upon in __ceph_open_session().
453 */
454 int ceph_monc_open_session(struct ceph_mon_client *monc)
455 {
456 mutex_lock(&monc->mutex);
457 __ceph_monc_want_map(monc, CEPH_SUB_MONMAP, 0, true);
458 __ceph_monc_want_map(monc, CEPH_SUB_OSDMAP, 0, false);
459 __open_session(monc);
460 __schedule_delayed(monc);
461 mutex_unlock(&monc->mutex);
462 return 0;
463 }
464 EXPORT_SYMBOL(ceph_monc_open_session);
465
466 static void ceph_monc_handle_map(struct ceph_mon_client *monc,
467 struct ceph_msg *msg)
468 {
469 struct ceph_client *client = monc->client;
470 struct ceph_monmap *monmap;
471 void *p, *end;
472
473 mutex_lock(&monc->mutex);
474
475 dout("handle_monmap\n");
476 p = msg->front.iov_base;
477 end = p + msg->front.iov_len;
478
479 monmap = ceph_monmap_decode(p, end);
480 if (IS_ERR(monmap)) {
481 pr_err("problem decoding monmap, %d\n",
482 (int)PTR_ERR(monmap));
483 ceph_msg_dump(msg);
484 goto out;
485 }
486
487 if (ceph_check_fsid(client, &monmap->fsid) < 0) {
488 kfree(monmap);
489 goto out;
490 }
491
492 kfree(monc->monmap);
493 monc->monmap = monmap;
494
495 __ceph_monc_got_map(monc, CEPH_SUB_MONMAP, monc->monmap->epoch);
496 client->have_fsid = true;
497
498 out:
499 mutex_unlock(&monc->mutex);
500 wake_up_all(&client->auth_wq);
501 }
502
503 /*
504 * generic requests (currently statfs, mon_get_version)
505 */
506 DEFINE_RB_FUNCS(generic_request, struct ceph_mon_generic_request, tid, node)
507
508 static void release_generic_request(struct kref *kref)
509 {
510 struct ceph_mon_generic_request *req =
511 container_of(kref, struct ceph_mon_generic_request, kref);
512
513 dout("%s greq %p request %p reply %p\n", __func__, req, req->request,
514 req->reply);
515 WARN_ON(!RB_EMPTY_NODE(&req->node));
516
517 if (req->reply)
518 ceph_msg_put(req->reply);
519 if (req->request)
520 ceph_msg_put(req->request);
521
522 kfree(req);
523 }
524
525 static void put_generic_request(struct ceph_mon_generic_request *req)
526 {
527 if (req)
528 kref_put(&req->kref, release_generic_request);
529 }
530
531 static void get_generic_request(struct ceph_mon_generic_request *req)
532 {
533 kref_get(&req->kref);
534 }
535
536 static struct ceph_mon_generic_request *
537 alloc_generic_request(struct ceph_mon_client *monc, gfp_t gfp)
538 {
539 struct ceph_mon_generic_request *req;
540
541 req = kzalloc(sizeof(*req), gfp);
542 if (!req)
543 return NULL;
544
545 req->monc = monc;
546 kref_init(&req->kref);
547 RB_CLEAR_NODE(&req->node);
548 init_completion(&req->completion);
549
550 dout("%s greq %p\n", __func__, req);
551 return req;
552 }
553
554 static void register_generic_request(struct ceph_mon_generic_request *req)
555 {
556 struct ceph_mon_client *monc = req->monc;
557
558 WARN_ON(req->tid);
559
560 get_generic_request(req);
561 req->tid = ++monc->last_tid;
562 insert_generic_request(&monc->generic_request_tree, req);
563 }
564
565 static void send_generic_request(struct ceph_mon_client *monc,
566 struct ceph_mon_generic_request *req)
567 {
568 WARN_ON(!req->tid);
569
570 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
571 req->request->hdr.tid = cpu_to_le64(req->tid);
572 ceph_con_send(&monc->con, ceph_msg_get(req->request));
573 }
574
575 static void __finish_generic_request(struct ceph_mon_generic_request *req)
576 {
577 struct ceph_mon_client *monc = req->monc;
578
579 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
580 erase_generic_request(&monc->generic_request_tree, req);
581
582 ceph_msg_revoke(req->request);
583 ceph_msg_revoke_incoming(req->reply);
584 }
585
586 static void finish_generic_request(struct ceph_mon_generic_request *req)
587 {
588 __finish_generic_request(req);
589 put_generic_request(req);
590 }
591
592 static void complete_generic_request(struct ceph_mon_generic_request *req)
593 {
594 if (req->complete_cb)
595 req->complete_cb(req);
596 else
597 complete_all(&req->completion);
598 put_generic_request(req);
599 }
600
601 static void cancel_generic_request(struct ceph_mon_generic_request *req)
602 {
603 struct ceph_mon_client *monc = req->monc;
604 struct ceph_mon_generic_request *lookup_req;
605
606 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
607
608 mutex_lock(&monc->mutex);
609 lookup_req = lookup_generic_request(&monc->generic_request_tree,
610 req->tid);
611 if (lookup_req) {
612 WARN_ON(lookup_req != req);
613 finish_generic_request(req);
614 }
615
616 mutex_unlock(&monc->mutex);
617 }
618
619 static int wait_generic_request(struct ceph_mon_generic_request *req)
620 {
621 int ret;
622
623 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
624 ret = wait_for_completion_interruptible(&req->completion);
625 if (ret)
626 cancel_generic_request(req);
627 else
628 ret = req->result; /* completed */
629
630 return ret;
631 }
632
633 static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
634 struct ceph_msg_header *hdr,
635 int *skip)
636 {
637 struct ceph_mon_client *monc = con->private;
638 struct ceph_mon_generic_request *req;
639 u64 tid = le64_to_cpu(hdr->tid);
640 struct ceph_msg *m;
641
642 mutex_lock(&monc->mutex);
643 req = lookup_generic_request(&monc->generic_request_tree, tid);
644 if (!req) {
645 dout("get_generic_reply %lld dne\n", tid);
646 *skip = 1;
647 m = NULL;
648 } else {
649 dout("get_generic_reply %lld got %p\n", tid, req->reply);
650 *skip = 0;
651 m = ceph_msg_get(req->reply);
652 /*
653 * we don't need to track the connection reading into
654 * this reply because we only have one open connection
655 * at a time, ever.
656 */
657 }
658 mutex_unlock(&monc->mutex);
659 return m;
660 }
661
662 /*
663 * statfs
664 */
665 static void handle_statfs_reply(struct ceph_mon_client *monc,
666 struct ceph_msg *msg)
667 {
668 struct ceph_mon_generic_request *req;
669 struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
670 u64 tid = le64_to_cpu(msg->hdr.tid);
671
672 dout("%s msg %p tid %llu\n", __func__, msg, tid);
673
674 if (msg->front.iov_len != sizeof(*reply))
675 goto bad;
676
677 mutex_lock(&monc->mutex);
678 req = lookup_generic_request(&monc->generic_request_tree, tid);
679 if (!req) {
680 mutex_unlock(&monc->mutex);
681 return;
682 }
683
684 req->result = 0;
685 *req->u.st = reply->st; /* struct */
686 __finish_generic_request(req);
687 mutex_unlock(&monc->mutex);
688
689 complete_generic_request(req);
690 return;
691
692 bad:
693 pr_err("corrupt statfs reply, tid %llu\n", tid);
694 ceph_msg_dump(msg);
695 }
696
697 /*
698 * Do a synchronous statfs().
699 */
700 int ceph_monc_do_statfs(struct ceph_mon_client *monc, u64 data_pool,
701 struct ceph_statfs *buf)
702 {
703 struct ceph_mon_generic_request *req;
704 struct ceph_mon_statfs *h;
705 int ret = -ENOMEM;
706
707 req = alloc_generic_request(monc, GFP_NOFS);
708 if (!req)
709 goto out;
710
711 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS,
712 true);
713 if (!req->request)
714 goto out;
715
716 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 64, GFP_NOFS, true);
717 if (!req->reply)
718 goto out;
719
720 req->u.st = buf;
721 req->request->hdr.version = cpu_to_le16(2);
722
723 mutex_lock(&monc->mutex);
724 register_generic_request(req);
725 /* fill out request */
726 h = req->request->front.iov_base;
727 h->monhdr.have_version = 0;
728 h->monhdr.session_mon = cpu_to_le16(-1);
729 h->monhdr.session_mon_tid = 0;
730 h->fsid = monc->monmap->fsid;
731 h->contains_data_pool = (data_pool != CEPH_NOPOOL);
732 h->data_pool = cpu_to_le64(data_pool);
733 send_generic_request(monc, req);
734 mutex_unlock(&monc->mutex);
735
736 ret = wait_generic_request(req);
737 out:
738 put_generic_request(req);
739 return ret;
740 }
741 EXPORT_SYMBOL(ceph_monc_do_statfs);
742
743 static void handle_get_version_reply(struct ceph_mon_client *monc,
744 struct ceph_msg *msg)
745 {
746 struct ceph_mon_generic_request *req;
747 u64 tid = le64_to_cpu(msg->hdr.tid);
748 void *p = msg->front.iov_base;
749 void *end = p + msg->front_alloc_len;
750 u64 handle;
751
752 dout("%s msg %p tid %llu\n", __func__, msg, tid);
753
754 ceph_decode_need(&p, end, 2*sizeof(u64), bad);
755 handle = ceph_decode_64(&p);
756 if (tid != 0 && tid != handle)
757 goto bad;
758
759 mutex_lock(&monc->mutex);
760 req = lookup_generic_request(&monc->generic_request_tree, handle);
761 if (!req) {
762 mutex_unlock(&monc->mutex);
763 return;
764 }
765
766 req->result = 0;
767 req->u.newest = ceph_decode_64(&p);
768 __finish_generic_request(req);
769 mutex_unlock(&monc->mutex);
770
771 complete_generic_request(req);
772 return;
773
774 bad:
775 pr_err("corrupt mon_get_version reply, tid %llu\n", tid);
776 ceph_msg_dump(msg);
777 }
778
779 static struct ceph_mon_generic_request *
780 __ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
781 ceph_monc_callback_t cb, u64 private_data)
782 {
783 struct ceph_mon_generic_request *req;
784
785 req = alloc_generic_request(monc, GFP_NOIO);
786 if (!req)
787 goto err_put_req;
788
789 req->request = ceph_msg_new(CEPH_MSG_MON_GET_VERSION,
790 sizeof(u64) + sizeof(u32) + strlen(what),
791 GFP_NOIO, true);
792 if (!req->request)
793 goto err_put_req;
794
795 req->reply = ceph_msg_new(CEPH_MSG_MON_GET_VERSION_REPLY, 32, GFP_NOIO,
796 true);
797 if (!req->reply)
798 goto err_put_req;
799
800 req->complete_cb = cb;
801 req->private_data = private_data;
802
803 mutex_lock(&monc->mutex);
804 register_generic_request(req);
805 {
806 void *p = req->request->front.iov_base;
807 void *const end = p + req->request->front_alloc_len;
808
809 ceph_encode_64(&p, req->tid); /* handle */
810 ceph_encode_string(&p, end, what, strlen(what));
811 WARN_ON(p != end);
812 }
813 send_generic_request(monc, req);
814 mutex_unlock(&monc->mutex);
815
816 return req;
817
818 err_put_req:
819 put_generic_request(req);
820 return ERR_PTR(-ENOMEM);
821 }
822
823 /*
824 * Send MMonGetVersion and wait for the reply.
825 *
826 * @what: one of "mdsmap", "osdmap" or "monmap"
827 */
828 int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
829 u64 *newest)
830 {
831 struct ceph_mon_generic_request *req;
832 int ret;
833
834 req = __ceph_monc_get_version(monc, what, NULL, 0);
835 if (IS_ERR(req))
836 return PTR_ERR(req);
837
838 ret = wait_generic_request(req);
839 if (!ret)
840 *newest = req->u.newest;
841
842 put_generic_request(req);
843 return ret;
844 }
845 EXPORT_SYMBOL(ceph_monc_get_version);
846
847 /*
848 * Send MMonGetVersion,
849 *
850 * @what: one of "mdsmap", "osdmap" or "monmap"
851 */
852 int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
853 ceph_monc_callback_t cb, u64 private_data)
854 {
855 struct ceph_mon_generic_request *req;
856
857 req = __ceph_monc_get_version(monc, what, cb, private_data);
858 if (IS_ERR(req))
859 return PTR_ERR(req);
860
861 put_generic_request(req);
862 return 0;
863 }
864 EXPORT_SYMBOL(ceph_monc_get_version_async);
865
866 static void handle_command_ack(struct ceph_mon_client *monc,
867 struct ceph_msg *msg)
868 {
869 struct ceph_mon_generic_request *req;
870 void *p = msg->front.iov_base;
871 void *const end = p + msg->front_alloc_len;
872 u64 tid = le64_to_cpu(msg->hdr.tid);
873
874 dout("%s msg %p tid %llu\n", __func__, msg, tid);
875
876 ceph_decode_need(&p, end, sizeof(struct ceph_mon_request_header) +
877 sizeof(u32), bad);
878 p += sizeof(struct ceph_mon_request_header);
879
880 mutex_lock(&monc->mutex);
881 req = lookup_generic_request(&monc->generic_request_tree, tid);
882 if (!req) {
883 mutex_unlock(&monc->mutex);
884 return;
885 }
886
887 req->result = ceph_decode_32(&p);
888 __finish_generic_request(req);
889 mutex_unlock(&monc->mutex);
890
891 complete_generic_request(req);
892 return;
893
894 bad:
895 pr_err("corrupt mon_command ack, tid %llu\n", tid);
896 ceph_msg_dump(msg);
897 }
898
899 int ceph_monc_blacklist_add(struct ceph_mon_client *monc,
900 struct ceph_entity_addr *client_addr)
901 {
902 struct ceph_mon_generic_request *req;
903 struct ceph_mon_command *h;
904 int ret = -ENOMEM;
905 int len;
906
907 req = alloc_generic_request(monc, GFP_NOIO);
908 if (!req)
909 goto out;
910
911 req->request = ceph_msg_new(CEPH_MSG_MON_COMMAND, 256, GFP_NOIO, true);
912 if (!req->request)
913 goto out;
914
915 req->reply = ceph_msg_new(CEPH_MSG_MON_COMMAND_ACK, 512, GFP_NOIO,
916 true);
917 if (!req->reply)
918 goto out;
919
920 mutex_lock(&monc->mutex);
921 register_generic_request(req);
922 h = req->request->front.iov_base;
923 h->monhdr.have_version = 0;
924 h->monhdr.session_mon = cpu_to_le16(-1);
925 h->monhdr.session_mon_tid = 0;
926 h->fsid = monc->monmap->fsid;
927 h->num_strs = cpu_to_le32(1);
928 len = sprintf(h->str, "{ \"prefix\": \"osd blacklist\", \
929 \"blacklistop\": \"add\", \
930 \"addr\": \"%pISpc/%u\" }",
931 &client_addr->in_addr, le32_to_cpu(client_addr->nonce));
932 h->str_len = cpu_to_le32(len);
933 send_generic_request(monc, req);
934 mutex_unlock(&monc->mutex);
935
936 ret = wait_generic_request(req);
937 if (!ret)
938 /*
939 * Make sure we have the osdmap that includes the blacklist
940 * entry. This is needed to ensure that the OSDs pick up the
941 * new blacklist before processing any future requests from
942 * this client.
943 */
944 ret = ceph_wait_for_latest_osdmap(monc->client, 0);
945
946 out:
947 put_generic_request(req);
948 return ret;
949 }
950 EXPORT_SYMBOL(ceph_monc_blacklist_add);
951
952 /*
953 * Resend pending generic requests.
954 */
955 static void __resend_generic_request(struct ceph_mon_client *monc)
956 {
957 struct ceph_mon_generic_request *req;
958 struct rb_node *p;
959
960 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
961 req = rb_entry(p, struct ceph_mon_generic_request, node);
962 ceph_msg_revoke(req->request);
963 ceph_msg_revoke_incoming(req->reply);
964 ceph_con_send(&monc->con, ceph_msg_get(req->request));
965 }
966 }
967
968 /*
969 * Delayed work. If we haven't mounted yet, retry. Otherwise,
970 * renew/retry subscription as needed (in case it is timing out, or we
971 * got an ENOMEM). And keep the monitor connection alive.
972 */
973 static void delayed_work(struct work_struct *work)
974 {
975 struct ceph_mon_client *monc =
976 container_of(work, struct ceph_mon_client, delayed_work.work);
977
978 dout("monc delayed_work\n");
979 mutex_lock(&monc->mutex);
980 if (monc->hunting) {
981 dout("%s continuing hunt\n", __func__);
982 reopen_session(monc);
983 } else {
984 int is_auth = ceph_auth_is_authenticated(monc->auth);
985 if (ceph_con_keepalive_expired(&monc->con,
986 CEPH_MONC_PING_TIMEOUT)) {
987 dout("monc keepalive timeout\n");
988 is_auth = 0;
989 reopen_session(monc);
990 }
991
992 if (!monc->hunting) {
993 ceph_con_keepalive(&monc->con);
994 __validate_auth(monc);
995 un_backoff(monc);
996 }
997
998 if (is_auth &&
999 !(monc->con.peer_features & CEPH_FEATURE_MON_STATEFUL_SUB)) {
1000 unsigned long now = jiffies;
1001
1002 dout("%s renew subs? now %lu renew after %lu\n",
1003 __func__, now, monc->sub_renew_after);
1004 if (time_after_eq(now, monc->sub_renew_after))
1005 __send_subscribe(monc);
1006 }
1007 }
1008 __schedule_delayed(monc);
1009 mutex_unlock(&monc->mutex);
1010 }
1011
1012 /*
1013 * On startup, we build a temporary monmap populated with the IPs
1014 * provided by mount(2).
1015 */
1016 static int build_initial_monmap(struct ceph_mon_client *monc)
1017 {
1018 struct ceph_options *opt = monc->client->options;
1019 struct ceph_entity_addr *mon_addr = opt->mon_addr;
1020 int num_mon = opt->num_mon;
1021 int i;
1022
1023 /* build initial monmap */
1024 monc->monmap = kzalloc(struct_size(monc->monmap, mon_inst, num_mon),
1025 GFP_KERNEL);
1026 if (!monc->monmap)
1027 return -ENOMEM;
1028 for (i = 0; i < num_mon; i++) {
1029 monc->monmap->mon_inst[i].addr = mon_addr[i];
1030 monc->monmap->mon_inst[i].addr.nonce = 0;
1031 monc->monmap->mon_inst[i].name.type =
1032 CEPH_ENTITY_TYPE_MON;
1033 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
1034 }
1035 monc->monmap->num_mon = num_mon;
1036 return 0;
1037 }
1038
1039 int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
1040 {
1041 int err = 0;
1042
1043 dout("init\n");
1044 memset(monc, 0, sizeof(*monc));
1045 monc->client = cl;
1046 monc->monmap = NULL;
1047 mutex_init(&monc->mutex);
1048
1049 err = build_initial_monmap(monc);
1050 if (err)
1051 goto out;
1052
1053 /* connection */
1054 /* authentication */
1055 monc->auth = ceph_auth_init(cl->options->name,
1056 cl->options->key);
1057 if (IS_ERR(monc->auth)) {
1058 err = PTR_ERR(monc->auth);
1059 goto out_monmap;
1060 }
1061 monc->auth->want_keys =
1062 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
1063 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
1064
1065 /* msgs */
1066 err = -ENOMEM;
1067 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
1068 sizeof(struct ceph_mon_subscribe_ack),
1069 GFP_KERNEL, true);
1070 if (!monc->m_subscribe_ack)
1071 goto out_auth;
1072
1073 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 128,
1074 GFP_KERNEL, true);
1075 if (!monc->m_subscribe)
1076 goto out_subscribe_ack;
1077
1078 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096,
1079 GFP_KERNEL, true);
1080 if (!monc->m_auth_reply)
1081 goto out_subscribe;
1082
1083 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_KERNEL, true);
1084 monc->pending_auth = 0;
1085 if (!monc->m_auth)
1086 goto out_auth_reply;
1087
1088 ceph_con_init(&monc->con, monc, &mon_con_ops,
1089 &monc->client->msgr);
1090
1091 monc->cur_mon = -1;
1092 monc->had_a_connection = false;
1093 monc->hunt_mult = 1;
1094
1095 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
1096 monc->generic_request_tree = RB_ROOT;
1097 monc->last_tid = 0;
1098
1099 monc->fs_cluster_id = CEPH_FS_CLUSTER_ID_NONE;
1100
1101 return 0;
1102
1103 out_auth_reply:
1104 ceph_msg_put(monc->m_auth_reply);
1105 out_subscribe:
1106 ceph_msg_put(monc->m_subscribe);
1107 out_subscribe_ack:
1108 ceph_msg_put(monc->m_subscribe_ack);
1109 out_auth:
1110 ceph_auth_destroy(monc->auth);
1111 out_monmap:
1112 kfree(monc->monmap);
1113 out:
1114 return err;
1115 }
1116 EXPORT_SYMBOL(ceph_monc_init);
1117
1118 void ceph_monc_stop(struct ceph_mon_client *monc)
1119 {
1120 dout("stop\n");
1121 cancel_delayed_work_sync(&monc->delayed_work);
1122
1123 mutex_lock(&monc->mutex);
1124 __close_session(monc);
1125 monc->cur_mon = -1;
1126 mutex_unlock(&monc->mutex);
1127
1128 /*
1129 * flush msgr queue before we destroy ourselves to ensure that:
1130 * - any work that references our embedded con is finished.
1131 * - any osd_client or other work that may reference an authorizer
1132 * finishes before we shut down the auth subsystem.
1133 */
1134 ceph_msgr_flush();
1135
1136 ceph_auth_destroy(monc->auth);
1137
1138 WARN_ON(!RB_EMPTY_ROOT(&monc->generic_request_tree));
1139
1140 ceph_msg_put(monc->m_auth);
1141 ceph_msg_put(monc->m_auth_reply);
1142 ceph_msg_put(monc->m_subscribe);
1143 ceph_msg_put(monc->m_subscribe_ack);
1144
1145 kfree(monc->monmap);
1146 }
1147 EXPORT_SYMBOL(ceph_monc_stop);
1148
1149 static void finish_hunting(struct ceph_mon_client *monc)
1150 {
1151 if (monc->hunting) {
1152 dout("%s found mon%d\n", __func__, monc->cur_mon);
1153 monc->hunting = false;
1154 monc->had_a_connection = true;
1155 un_backoff(monc);
1156 __schedule_delayed(monc);
1157 }
1158 }
1159
1160 static void handle_auth_reply(struct ceph_mon_client *monc,
1161 struct ceph_msg *msg)
1162 {
1163 int ret;
1164 int was_auth = 0;
1165
1166 mutex_lock(&monc->mutex);
1167 was_auth = ceph_auth_is_authenticated(monc->auth);
1168 monc->pending_auth = 0;
1169 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
1170 msg->front.iov_len,
1171 monc->m_auth->front.iov_base,
1172 monc->m_auth->front_alloc_len);
1173 if (ret > 0) {
1174 __send_prepared_auth_request(monc, ret);
1175 goto out;
1176 }
1177
1178 finish_hunting(monc);
1179
1180 if (ret < 0) {
1181 monc->client->auth_err = ret;
1182 } else if (!was_auth && ceph_auth_is_authenticated(monc->auth)) {
1183 dout("authenticated, starting session\n");
1184
1185 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
1186 monc->client->msgr.inst.name.num =
1187 cpu_to_le64(monc->auth->global_id);
1188
1189 __send_subscribe(monc);
1190 __resend_generic_request(monc);
1191
1192 pr_info("mon%d %s session established\n", monc->cur_mon,
1193 ceph_pr_addr(&monc->con.peer_addr));
1194 }
1195
1196 out:
1197 mutex_unlock(&monc->mutex);
1198 if (monc->client->auth_err < 0)
1199 wake_up_all(&monc->client->auth_wq);
1200 }
1201
1202 static int __validate_auth(struct ceph_mon_client *monc)
1203 {
1204 int ret;
1205
1206 if (monc->pending_auth)
1207 return 0;
1208
1209 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
1210 monc->m_auth->front_alloc_len);
1211 if (ret <= 0)
1212 return ret; /* either an error, or no need to authenticate */
1213 __send_prepared_auth_request(monc, ret);
1214 return 0;
1215 }
1216
1217 int ceph_monc_validate_auth(struct ceph_mon_client *monc)
1218 {
1219 int ret;
1220
1221 mutex_lock(&monc->mutex);
1222 ret = __validate_auth(monc);
1223 mutex_unlock(&monc->mutex);
1224 return ret;
1225 }
1226 EXPORT_SYMBOL(ceph_monc_validate_auth);
1227
1228 /*
1229 * handle incoming message
1230 */
1231 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1232 {
1233 struct ceph_mon_client *monc = con->private;
1234 int type = le16_to_cpu(msg->hdr.type);
1235
1236 switch (type) {
1237 case CEPH_MSG_AUTH_REPLY:
1238 handle_auth_reply(monc, msg);
1239 break;
1240
1241 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1242 handle_subscribe_ack(monc, msg);
1243 break;
1244
1245 case CEPH_MSG_STATFS_REPLY:
1246 handle_statfs_reply(monc, msg);
1247 break;
1248
1249 case CEPH_MSG_MON_GET_VERSION_REPLY:
1250 handle_get_version_reply(monc, msg);
1251 break;
1252
1253 case CEPH_MSG_MON_COMMAND_ACK:
1254 handle_command_ack(monc, msg);
1255 break;
1256
1257 case CEPH_MSG_MON_MAP:
1258 ceph_monc_handle_map(monc, msg);
1259 break;
1260
1261 case CEPH_MSG_OSD_MAP:
1262 ceph_osdc_handle_map(&monc->client->osdc, msg);
1263 break;
1264
1265 default:
1266 /* can the chained handler handle it? */
1267 if (monc->client->extra_mon_dispatch &&
1268 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1269 break;
1270
1271 pr_err("received unknown message type %d %s\n", type,
1272 ceph_msg_type_name(type));
1273 }
1274 ceph_msg_put(msg);
1275 }
1276
1277 /*
1278 * Allocate memory for incoming message
1279 */
1280 static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1281 struct ceph_msg_header *hdr,
1282 int *skip)
1283 {
1284 struct ceph_mon_client *monc = con->private;
1285 int type = le16_to_cpu(hdr->type);
1286 int front_len = le32_to_cpu(hdr->front_len);
1287 struct ceph_msg *m = NULL;
1288
1289 *skip = 0;
1290
1291 switch (type) {
1292 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1293 m = ceph_msg_get(monc->m_subscribe_ack);
1294 break;
1295 case CEPH_MSG_STATFS_REPLY:
1296 case CEPH_MSG_MON_COMMAND_ACK:
1297 return get_generic_reply(con, hdr, skip);
1298 case CEPH_MSG_AUTH_REPLY:
1299 m = ceph_msg_get(monc->m_auth_reply);
1300 break;
1301 case CEPH_MSG_MON_GET_VERSION_REPLY:
1302 if (le64_to_cpu(hdr->tid) != 0)
1303 return get_generic_reply(con, hdr, skip);
1304
1305 /*
1306 * Older OSDs don't set reply tid even if the orignal
1307 * request had a non-zero tid. Work around this weirdness
1308 * by allocating a new message.
1309 */
1310 fallthrough;
1311 case CEPH_MSG_MON_MAP:
1312 case CEPH_MSG_MDS_MAP:
1313 case CEPH_MSG_OSD_MAP:
1314 case CEPH_MSG_FS_MAP_USER:
1315 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1316 if (!m)
1317 return NULL; /* ENOMEM--return skip == 0 */
1318 break;
1319 }
1320
1321 if (!m) {
1322 pr_info("alloc_msg unknown type %d\n", type);
1323 *skip = 1;
1324 } else if (front_len > m->front_alloc_len) {
1325 pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
1326 front_len, m->front_alloc_len,
1327 (unsigned int)con->peer_name.type,
1328 le64_to_cpu(con->peer_name.num));
1329 ceph_msg_put(m);
1330 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1331 }
1332
1333 return m;
1334 }
1335
1336 /*
1337 * If the monitor connection resets, pick a new monitor and resubmit
1338 * any pending requests.
1339 */
1340 static void mon_fault(struct ceph_connection *con)
1341 {
1342 struct ceph_mon_client *monc = con->private;
1343
1344 mutex_lock(&monc->mutex);
1345 dout("%s mon%d\n", __func__, monc->cur_mon);
1346 if (monc->cur_mon >= 0) {
1347 if (!monc->hunting) {
1348 dout("%s hunting for new mon\n", __func__);
1349 reopen_session(monc);
1350 __schedule_delayed(monc);
1351 } else {
1352 dout("%s already hunting\n", __func__);
1353 }
1354 }
1355 mutex_unlock(&monc->mutex);
1356 }
1357
1358 /*
1359 * We can ignore refcounting on the connection struct, as all references
1360 * will come from the messenger workqueue, which is drained prior to
1361 * mon_client destruction.
1362 */
1363 static struct ceph_connection *con_get(struct ceph_connection *con)
1364 {
1365 return con;
1366 }
1367
1368 static void con_put(struct ceph_connection *con)
1369 {
1370 }
1371
1372 static const struct ceph_connection_operations mon_con_ops = {
1373 .get = con_get,
1374 .put = con_put,
1375 .dispatch = dispatch,
1376 .fault = mon_fault,
1377 .alloc_msg = mon_alloc_msg,
1378 };
Linux with added FPC-III support