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1#include <linux/ceph/ceph_debug.h>
2
3#include <linux/module.h>
4#include <linux/types.h>
5#include <linux/slab.h>
6#include <linux/random.h>
7#include <linux/sched.h>
8
9#include <linux/ceph/mon_client.h>
10#include <linux/ceph/libceph.h>
11#include <linux/ceph/debugfs.h>
12#include <linux/ceph/decode.h>
13#include <linux/ceph/auth.h>
14
15/*
16 * Interact with Ceph monitor cluster. Handle requests for new map
17 * versions, and periodically resend as needed. Also implement
18 * statfs() and umount().
19 *
20 * A small cluster of Ceph "monitors" are responsible for managing critical
21 * cluster configuration and state information. An odd number (e.g., 3, 5)
22 * of cmon daemons use a modified version of the Paxos part-time parliament
23 * algorithm to manage the MDS map (mds cluster membership), OSD map, and
24 * list of clients who have mounted the file system.
25 *
26 * We maintain an open, active session with a monitor at all times in order to
27 * receive timely MDSMap updates. We periodically send a keepalive byte on the
28 * TCP socket to ensure we detect a failure. If the connection does break, we
29 * randomly hunt for a new monitor. Once the connection is reestablished, we
30 * resend any outstanding requests.
31 */
32
33static const struct ceph_connection_operations mon_con_ops;
34
35static int __validate_auth(struct ceph_mon_client *monc);
36
37/*
38 * Decode a monmap blob (e.g., during mount).
39 */
40struct ceph_monmap *ceph_monmap_decode(void *p, void *end)
41{
42 struct ceph_monmap *m = NULL;
43 int i, err = -EINVAL;
44 struct ceph_fsid fsid;
45 u32 epoch, num_mon;
46 u16 version;
47 u32 len;
48
49 ceph_decode_32_safe(&p, end, len, bad);
50 ceph_decode_need(&p, end, len, bad);
51
52 dout("monmap_decode %p %p len %d\n", p, end, (int)(end-p));
53
54 ceph_decode_16_safe(&p, end, version, bad);
55
56 ceph_decode_need(&p, end, sizeof(fsid) + 2*sizeof(u32), bad);
57 ceph_decode_copy(&p, &fsid, sizeof(fsid));
58 epoch = ceph_decode_32(&p);
59
60 num_mon = ceph_decode_32(&p);
61 ceph_decode_need(&p, end, num_mon*sizeof(m->mon_inst[0]), bad);
62
63 if (num_mon >= CEPH_MAX_MON)
64 goto bad;
65 m = kmalloc(sizeof(*m) + sizeof(m->mon_inst[0])*num_mon, GFP_NOFS);
66 if (m == NULL)
67 return ERR_PTR(-ENOMEM);
68 m->fsid = fsid;
69 m->epoch = epoch;
70 m->num_mon = num_mon;
71 ceph_decode_copy(&p, m->mon_inst, num_mon*sizeof(m->mon_inst[0]));
72 for (i = 0; i < num_mon; i++)
73 ceph_decode_addr(&m->mon_inst[i].addr);
74
75 dout("monmap_decode epoch %d, num_mon %d\n", m->epoch,
76 m->num_mon);
77 for (i = 0; i < m->num_mon; i++)
78 dout("monmap_decode mon%d is %s\n", i,
79 ceph_pr_addr(&m->mon_inst[i].addr.in_addr));
80 return m;
81
82bad:
83 dout("monmap_decode failed with %d\n", err);
84 kfree(m);
85 return ERR_PTR(err);
86}
87
88/*
89 * return true if *addr is included in the monmap.
90 */
91int ceph_monmap_contains(struct ceph_monmap *m, struct ceph_entity_addr *addr)
92{
93 int i;
94
95 for (i = 0; i < m->num_mon; i++)
96 if (memcmp(addr, &m->mon_inst[i].addr, sizeof(*addr)) == 0)
97 return 1;
98 return 0;
99}
100
101/*
102 * Send an auth request.
103 */
104static void __send_prepared_auth_request(struct ceph_mon_client *monc, int len)
105{
106 monc->pending_auth = 1;
107 monc->m_auth->front.iov_len = len;
108 monc->m_auth->hdr.front_len = cpu_to_le32(len);
109 ceph_con_revoke(monc->con, monc->m_auth);
110 ceph_msg_get(monc->m_auth); /* keep our ref */
111 ceph_con_send(monc->con, monc->m_auth);
112}
113
114/*
115 * Close monitor session, if any.
116 */
117static void __close_session(struct ceph_mon_client *monc)
118{
119 dout("__close_session closing mon%d\n", monc->cur_mon);
120 ceph_con_revoke(monc->con, monc->m_auth);
121 ceph_con_close(monc->con);
122 monc->cur_mon = -1;
123 monc->pending_auth = 0;
124 ceph_auth_reset(monc->auth);
125}
126
127/*
128 * Open a session with a (new) monitor.
129 */
130static int __open_session(struct ceph_mon_client *monc)
131{
132 char r;
133 int ret;
134
135 if (monc->cur_mon < 0) {
136 get_random_bytes(&r, 1);
137 monc->cur_mon = r % monc->monmap->num_mon;
138 dout("open_session num=%d r=%d -> mon%d\n",
139 monc->monmap->num_mon, r, monc->cur_mon);
140 monc->sub_sent = 0;
141 monc->sub_renew_after = jiffies; /* i.e., expired */
142 monc->want_next_osdmap = !!monc->want_next_osdmap;
143
144 dout("open_session mon%d opening\n", monc->cur_mon);
145 monc->con->peer_name.type = CEPH_ENTITY_TYPE_MON;
146 monc->con->peer_name.num = cpu_to_le64(monc->cur_mon);
147 ceph_con_open(monc->con,
148 &monc->monmap->mon_inst[monc->cur_mon].addr);
149
150 /* initiatiate authentication handshake */
151 ret = ceph_auth_build_hello(monc->auth,
152 monc->m_auth->front.iov_base,
153 monc->m_auth->front_max);
154 __send_prepared_auth_request(monc, ret);
155 } else {
156 dout("open_session mon%d already open\n", monc->cur_mon);
157 }
158 return 0;
159}
160
161static bool __sub_expired(struct ceph_mon_client *monc)
162{
163 return time_after_eq(jiffies, monc->sub_renew_after);
164}
165
166/*
167 * Reschedule delayed work timer.
168 */
169static void __schedule_delayed(struct ceph_mon_client *monc)
170{
171 unsigned int delay;
172
173 if (monc->cur_mon < 0 || __sub_expired(monc))
174 delay = 10 * HZ;
175 else
176 delay = 20 * HZ;
177 dout("__schedule_delayed after %u\n", delay);
178 schedule_delayed_work(&monc->delayed_work, delay);
179}
180
181/*
182 * Send subscribe request for mdsmap and/or osdmap.
183 */
184static void __send_subscribe(struct ceph_mon_client *monc)
185{
186 dout("__send_subscribe sub_sent=%u exp=%u want_osd=%d\n",
187 (unsigned int)monc->sub_sent, __sub_expired(monc),
188 monc->want_next_osdmap);
189 if ((__sub_expired(monc) && !monc->sub_sent) ||
190 monc->want_next_osdmap == 1) {
191 struct ceph_msg *msg = monc->m_subscribe;
192 struct ceph_mon_subscribe_item *i;
193 void *p, *end;
194 int num;
195
196 p = msg->front.iov_base;
197 end = p + msg->front_max;
198
199 num = 1 + !!monc->want_next_osdmap + !!monc->want_mdsmap;
200 ceph_encode_32(&p, num);
201
202 if (monc->want_next_osdmap) {
203 dout("__send_subscribe to 'osdmap' %u\n",
204 (unsigned int)monc->have_osdmap);
205 ceph_encode_string(&p, end, "osdmap", 6);
206 i = p;
207 i->have = cpu_to_le64(monc->have_osdmap);
208 i->onetime = 1;
209 p += sizeof(*i);
210 monc->want_next_osdmap = 2; /* requested */
211 }
212 if (monc->want_mdsmap) {
213 dout("__send_subscribe to 'mdsmap' %u+\n",
214 (unsigned int)monc->have_mdsmap);
215 ceph_encode_string(&p, end, "mdsmap", 6);
216 i = p;
217 i->have = cpu_to_le64(monc->have_mdsmap);
218 i->onetime = 0;
219 p += sizeof(*i);
220 }
221 ceph_encode_string(&p, end, "monmap", 6);
222 i = p;
223 i->have = 0;
224 i->onetime = 0;
225 p += sizeof(*i);
226
227 msg->front.iov_len = p - msg->front.iov_base;
228 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
229 ceph_con_revoke(monc->con, msg);
230 ceph_con_send(monc->con, ceph_msg_get(msg));
231
232 monc->sub_sent = jiffies | 1; /* never 0 */
233 }
234}
235
236static void handle_subscribe_ack(struct ceph_mon_client *monc,
237 struct ceph_msg *msg)
238{
239 unsigned int seconds;
240 struct ceph_mon_subscribe_ack *h = msg->front.iov_base;
241
242 if (msg->front.iov_len < sizeof(*h))
243 goto bad;
244 seconds = le32_to_cpu(h->duration);
245
246 mutex_lock(&monc->mutex);
247 if (monc->hunting) {
248 pr_info("mon%d %s session established\n",
249 monc->cur_mon,
250 ceph_pr_addr(&monc->con->peer_addr.in_addr));
251 monc->hunting = false;
252 }
253 dout("handle_subscribe_ack after %d seconds\n", seconds);
254 monc->sub_renew_after = monc->sub_sent + (seconds >> 1)*HZ - 1;
255 monc->sub_sent = 0;
256 mutex_unlock(&monc->mutex);
257 return;
258bad:
259 pr_err("got corrupt subscribe-ack msg\n");
260 ceph_msg_dump(msg);
261}
262
263/*
264 * Keep track of which maps we have
265 */
266int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 got)
267{
268 mutex_lock(&monc->mutex);
269 monc->have_mdsmap = got;
270 mutex_unlock(&monc->mutex);
271 return 0;
272}
273EXPORT_SYMBOL(ceph_monc_got_mdsmap);
274
275int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 got)
276{
277 mutex_lock(&monc->mutex);
278 monc->have_osdmap = got;
279 monc->want_next_osdmap = 0;
280 mutex_unlock(&monc->mutex);
281 return 0;
282}
283
284/*
285 * Register interest in the next osdmap
286 */
287void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc)
288{
289 dout("request_next_osdmap have %u\n", monc->have_osdmap);
290 mutex_lock(&monc->mutex);
291 if (!monc->want_next_osdmap)
292 monc->want_next_osdmap = 1;
293 if (monc->want_next_osdmap < 2)
294 __send_subscribe(monc);
295 mutex_unlock(&monc->mutex);
296}
297
298/*
299 *
300 */
301int ceph_monc_open_session(struct ceph_mon_client *monc)
302{
303 mutex_lock(&monc->mutex);
304 __open_session(monc);
305 __schedule_delayed(monc);
306 mutex_unlock(&monc->mutex);
307 return 0;
308}
309EXPORT_SYMBOL(ceph_monc_open_session);
310
311/*
312 * The monitor responds with mount ack indicate mount success. The
313 * included client ticket allows the client to talk to MDSs and OSDs.
314 */
315static void ceph_monc_handle_map(struct ceph_mon_client *monc,
316 struct ceph_msg *msg)
317{
318 struct ceph_client *client = monc->client;
319 struct ceph_monmap *monmap = NULL, *old = monc->monmap;
320 void *p, *end;
321
322 mutex_lock(&monc->mutex);
323
324 dout("handle_monmap\n");
325 p = msg->front.iov_base;
326 end = p + msg->front.iov_len;
327
328 monmap = ceph_monmap_decode(p, end);
329 if (IS_ERR(monmap)) {
330 pr_err("problem decoding monmap, %d\n",
331 (int)PTR_ERR(monmap));
332 goto out;
333 }
334
335 if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) {
336 kfree(monmap);
337 goto out;
338 }
339
340 client->monc.monmap = monmap;
341 kfree(old);
342
343 if (!client->have_fsid) {
344 client->have_fsid = true;
345 mutex_unlock(&monc->mutex);
346 /*
347 * do debugfs initialization without mutex to avoid
348 * creating a locking dependency
349 */
350 ceph_debugfs_client_init(client);
351 goto out_unlocked;
352 }
353out:
354 mutex_unlock(&monc->mutex);
355out_unlocked:
356 wake_up_all(&client->auth_wq);
357}
358
359/*
360 * generic requests (e.g., statfs, poolop)
361 */
362static struct ceph_mon_generic_request *__lookup_generic_req(
363 struct ceph_mon_client *monc, u64 tid)
364{
365 struct ceph_mon_generic_request *req;
366 struct rb_node *n = monc->generic_request_tree.rb_node;
367
368 while (n) {
369 req = rb_entry(n, struct ceph_mon_generic_request, node);
370 if (tid < req->tid)
371 n = n->rb_left;
372 else if (tid > req->tid)
373 n = n->rb_right;
374 else
375 return req;
376 }
377 return NULL;
378}
379
380static void __insert_generic_request(struct ceph_mon_client *monc,
381 struct ceph_mon_generic_request *new)
382{
383 struct rb_node **p = &monc->generic_request_tree.rb_node;
384 struct rb_node *parent = NULL;
385 struct ceph_mon_generic_request *req = NULL;
386
387 while (*p) {
388 parent = *p;
389 req = rb_entry(parent, struct ceph_mon_generic_request, node);
390 if (new->tid < req->tid)
391 p = &(*p)->rb_left;
392 else if (new->tid > req->tid)
393 p = &(*p)->rb_right;
394 else
395 BUG();
396 }
397
398 rb_link_node(&new->node, parent, p);
399 rb_insert_color(&new->node, &monc->generic_request_tree);
400}
401
402static void release_generic_request(struct kref *kref)
403{
404 struct ceph_mon_generic_request *req =
405 container_of(kref, struct ceph_mon_generic_request, kref);
406
407 if (req->reply)
408 ceph_msg_put(req->reply);
409 if (req->request)
410 ceph_msg_put(req->request);
411
412 kfree(req);
413}
414
415static void put_generic_request(struct ceph_mon_generic_request *req)
416{
417 kref_put(&req->kref, release_generic_request);
418}
419
420static void get_generic_request(struct ceph_mon_generic_request *req)
421{
422 kref_get(&req->kref);
423}
424
425static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
426 struct ceph_msg_header *hdr,
427 int *skip)
428{
429 struct ceph_mon_client *monc = con->private;
430 struct ceph_mon_generic_request *req;
431 u64 tid = le64_to_cpu(hdr->tid);
432 struct ceph_msg *m;
433
434 mutex_lock(&monc->mutex);
435 req = __lookup_generic_req(monc, tid);
436 if (!req) {
437 dout("get_generic_reply %lld dne\n", tid);
438 *skip = 1;
439 m = NULL;
440 } else {
441 dout("get_generic_reply %lld got %p\n", tid, req->reply);
442 m = ceph_msg_get(req->reply);
443 /*
444 * we don't need to track the connection reading into
445 * this reply because we only have one open connection
446 * at a time, ever.
447 */
448 }
449 mutex_unlock(&monc->mutex);
450 return m;
451}
452
453static int do_generic_request(struct ceph_mon_client *monc,
454 struct ceph_mon_generic_request *req)
455{
456 int err;
457
458 /* register request */
459 mutex_lock(&monc->mutex);
460 req->tid = ++monc->last_tid;
461 req->request->hdr.tid = cpu_to_le64(req->tid);
462 __insert_generic_request(monc, req);
463 monc->num_generic_requests++;
464 ceph_con_send(monc->con, ceph_msg_get(req->request));
465 mutex_unlock(&monc->mutex);
466
467 err = wait_for_completion_interruptible(&req->completion);
468
469 mutex_lock(&monc->mutex);
470 rb_erase(&req->node, &monc->generic_request_tree);
471 monc->num_generic_requests--;
472 mutex_unlock(&monc->mutex);
473
474 if (!err)
475 err = req->result;
476 return err;
477}
478
479/*
480 * statfs
481 */
482static void handle_statfs_reply(struct ceph_mon_client *monc,
483 struct ceph_msg *msg)
484{
485 struct ceph_mon_generic_request *req;
486 struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
487 u64 tid = le64_to_cpu(msg->hdr.tid);
488
489 if (msg->front.iov_len != sizeof(*reply))
490 goto bad;
491 dout("handle_statfs_reply %p tid %llu\n", msg, tid);
492
493 mutex_lock(&monc->mutex);
494 req = __lookup_generic_req(monc, tid);
495 if (req) {
496 *(struct ceph_statfs *)req->buf = reply->st;
497 req->result = 0;
498 get_generic_request(req);
499 }
500 mutex_unlock(&monc->mutex);
501 if (req) {
502 complete_all(&req->completion);
503 put_generic_request(req);
504 }
505 return;
506
507bad:
508 pr_err("corrupt generic reply, tid %llu\n", tid);
509 ceph_msg_dump(msg);
510}
511
512/*
513 * Do a synchronous statfs().
514 */
515int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf)
516{
517 struct ceph_mon_generic_request *req;
518 struct ceph_mon_statfs *h;
519 int err;
520
521 req = kzalloc(sizeof(*req), GFP_NOFS);
522 if (!req)
523 return -ENOMEM;
524
525 kref_init(&req->kref);
526 req->buf = buf;
527 req->buf_len = sizeof(*buf);
528 init_completion(&req->completion);
529
530 err = -ENOMEM;
531 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS,
532 true);
533 if (!req->request)
534 goto out;
535 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 1024, GFP_NOFS,
536 true);
537 if (!req->reply)
538 goto out;
539
540 /* fill out request */
541 h = req->request->front.iov_base;
542 h->monhdr.have_version = 0;
543 h->monhdr.session_mon = cpu_to_le16(-1);
544 h->monhdr.session_mon_tid = 0;
545 h->fsid = monc->monmap->fsid;
546
547 err = do_generic_request(monc, req);
548
549out:
550 kref_put(&req->kref, release_generic_request);
551 return err;
552}
553EXPORT_SYMBOL(ceph_monc_do_statfs);
554
555/*
556 * pool ops
557 */
558static int get_poolop_reply_buf(const char *src, size_t src_len,
559 char *dst, size_t dst_len)
560{
561 u32 buf_len;
562
563 if (src_len != sizeof(u32) + dst_len)
564 return -EINVAL;
565
566 buf_len = le32_to_cpu(*(u32 *)src);
567 if (buf_len != dst_len)
568 return -EINVAL;
569
570 memcpy(dst, src + sizeof(u32), dst_len);
571 return 0;
572}
573
574static void handle_poolop_reply(struct ceph_mon_client *monc,
575 struct ceph_msg *msg)
576{
577 struct ceph_mon_generic_request *req;
578 struct ceph_mon_poolop_reply *reply = msg->front.iov_base;
579 u64 tid = le64_to_cpu(msg->hdr.tid);
580
581 if (msg->front.iov_len < sizeof(*reply))
582 goto bad;
583 dout("handle_poolop_reply %p tid %llu\n", msg, tid);
584
585 mutex_lock(&monc->mutex);
586 req = __lookup_generic_req(monc, tid);
587 if (req) {
588 if (req->buf_len &&
589 get_poolop_reply_buf(msg->front.iov_base + sizeof(*reply),
590 msg->front.iov_len - sizeof(*reply),
591 req->buf, req->buf_len) < 0) {
592 mutex_unlock(&monc->mutex);
593 goto bad;
594 }
595 req->result = le32_to_cpu(reply->reply_code);
596 get_generic_request(req);
597 }
598 mutex_unlock(&monc->mutex);
599 if (req) {
600 complete(&req->completion);
601 put_generic_request(req);
602 }
603 return;
604
605bad:
606 pr_err("corrupt generic reply, tid %llu\n", tid);
607 ceph_msg_dump(msg);
608}
609
610/*
611 * Do a synchronous pool op.
612 */
613int ceph_monc_do_poolop(struct ceph_mon_client *monc, u32 op,
614 u32 pool, u64 snapid,
615 char *buf, int len)
616{
617 struct ceph_mon_generic_request *req;
618 struct ceph_mon_poolop *h;
619 int err;
620
621 req = kzalloc(sizeof(*req), GFP_NOFS);
622 if (!req)
623 return -ENOMEM;
624
625 kref_init(&req->kref);
626 req->buf = buf;
627 req->buf_len = len;
628 init_completion(&req->completion);
629
630 err = -ENOMEM;
631 req->request = ceph_msg_new(CEPH_MSG_POOLOP, sizeof(*h), GFP_NOFS,
632 true);
633 if (!req->request)
634 goto out;
635 req->reply = ceph_msg_new(CEPH_MSG_POOLOP_REPLY, 1024, GFP_NOFS,
636 true);
637 if (!req->reply)
638 goto out;
639
640 /* fill out request */
641 req->request->hdr.version = cpu_to_le16(2);
642 h = req->request->front.iov_base;
643 h->monhdr.have_version = 0;
644 h->monhdr.session_mon = cpu_to_le16(-1);
645 h->monhdr.session_mon_tid = 0;
646 h->fsid = monc->monmap->fsid;
647 h->pool = cpu_to_le32(pool);
648 h->op = cpu_to_le32(op);
649 h->auid = 0;
650 h->snapid = cpu_to_le64(snapid);
651 h->name_len = 0;
652
653 err = do_generic_request(monc, req);
654
655out:
656 kref_put(&req->kref, release_generic_request);
657 return err;
658}
659
660int ceph_monc_create_snapid(struct ceph_mon_client *monc,
661 u32 pool, u64 *snapid)
662{
663 return ceph_monc_do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP,
664 pool, 0, (char *)snapid, sizeof(*snapid));
665
666}
667EXPORT_SYMBOL(ceph_monc_create_snapid);
668
669int ceph_monc_delete_snapid(struct ceph_mon_client *monc,
670 u32 pool, u64 snapid)
671{
672 return ceph_monc_do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP,
673 pool, snapid, 0, 0);
674
675}
676
677/*
678 * Resend pending generic requests.
679 */
680static void __resend_generic_request(struct ceph_mon_client *monc)
681{
682 struct ceph_mon_generic_request *req;
683 struct rb_node *p;
684
685 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
686 req = rb_entry(p, struct ceph_mon_generic_request, node);
687 ceph_con_revoke(monc->con, req->request);
688 ceph_con_send(monc->con, ceph_msg_get(req->request));
689 }
690}
691
692/*
693 * Delayed work. If we haven't mounted yet, retry. Otherwise,
694 * renew/retry subscription as needed (in case it is timing out, or we
695 * got an ENOMEM). And keep the monitor connection alive.
696 */
697static void delayed_work(struct work_struct *work)
698{
699 struct ceph_mon_client *monc =
700 container_of(work, struct ceph_mon_client, delayed_work.work);
701
702 dout("monc delayed_work\n");
703 mutex_lock(&monc->mutex);
704 if (monc->hunting) {
705 __close_session(monc);
706 __open_session(monc); /* continue hunting */
707 } else {
708 ceph_con_keepalive(monc->con);
709
710 __validate_auth(monc);
711
712 if (monc->auth->ops->is_authenticated(monc->auth))
713 __send_subscribe(monc);
714 }
715 __schedule_delayed(monc);
716 mutex_unlock(&monc->mutex);
717}
718
719/*
720 * On startup, we build a temporary monmap populated with the IPs
721 * provided by mount(2).
722 */
723static int build_initial_monmap(struct ceph_mon_client *monc)
724{
725 struct ceph_options *opt = monc->client->options;
726 struct ceph_entity_addr *mon_addr = opt->mon_addr;
727 int num_mon = opt->num_mon;
728 int i;
729
730 /* build initial monmap */
731 monc->monmap = kzalloc(sizeof(*monc->monmap) +
732 num_mon*sizeof(monc->monmap->mon_inst[0]),
733 GFP_KERNEL);
734 if (!monc->monmap)
735 return -ENOMEM;
736 for (i = 0; i < num_mon; i++) {
737 monc->monmap->mon_inst[i].addr = mon_addr[i];
738 monc->monmap->mon_inst[i].addr.nonce = 0;
739 monc->monmap->mon_inst[i].name.type =
740 CEPH_ENTITY_TYPE_MON;
741 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
742 }
743 monc->monmap->num_mon = num_mon;
744 monc->have_fsid = false;
745 return 0;
746}
747
748int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
749{
750 int err = 0;
751
752 dout("init\n");
753 memset(monc, 0, sizeof(*monc));
754 monc->client = cl;
755 monc->monmap = NULL;
756 mutex_init(&monc->mutex);
757
758 err = build_initial_monmap(monc);
759 if (err)
760 goto out;
761
762 /* connection */
763 monc->con = kmalloc(sizeof(*monc->con), GFP_KERNEL);
764 if (!monc->con)
765 goto out_monmap;
766 ceph_con_init(monc->client->msgr, monc->con);
767 monc->con->private = monc;
768 monc->con->ops = &mon_con_ops;
769
770 /* authentication */
771 monc->auth = ceph_auth_init(cl->options->name,
772 cl->options->key);
773 if (IS_ERR(monc->auth)) {
774 err = PTR_ERR(monc->auth);
775 goto out_con;
776 }
777 monc->auth->want_keys =
778 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
779 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
780
781 /* msgs */
782 err = -ENOMEM;
783 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
784 sizeof(struct ceph_mon_subscribe_ack),
785 GFP_NOFS, true);
786 if (!monc->m_subscribe_ack)
787 goto out_auth;
788
789 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS,
790 true);
791 if (!monc->m_subscribe)
792 goto out_subscribe_ack;
793
794 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS,
795 true);
796 if (!monc->m_auth_reply)
797 goto out_subscribe;
798
799 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS, true);
800 monc->pending_auth = 0;
801 if (!monc->m_auth)
802 goto out_auth_reply;
803
804 monc->cur_mon = -1;
805 monc->hunting = true;
806 monc->sub_renew_after = jiffies;
807 monc->sub_sent = 0;
808
809 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
810 monc->generic_request_tree = RB_ROOT;
811 monc->num_generic_requests = 0;
812 monc->last_tid = 0;
813
814 monc->have_mdsmap = 0;
815 monc->have_osdmap = 0;
816 monc->want_next_osdmap = 1;
817 return 0;
818
819out_auth_reply:
820 ceph_msg_put(monc->m_auth_reply);
821out_subscribe:
822 ceph_msg_put(monc->m_subscribe);
823out_subscribe_ack:
824 ceph_msg_put(monc->m_subscribe_ack);
825out_auth:
826 ceph_auth_destroy(monc->auth);
827out_con:
828 monc->con->ops->put(monc->con);
829out_monmap:
830 kfree(monc->monmap);
831out:
832 return err;
833}
834EXPORT_SYMBOL(ceph_monc_init);
835
836void ceph_monc_stop(struct ceph_mon_client *monc)
837{
838 dout("stop\n");
839 cancel_delayed_work_sync(&monc->delayed_work);
840
841 mutex_lock(&monc->mutex);
842 __close_session(monc);
843
844 monc->con->private = NULL;
845 monc->con->ops->put(monc->con);
846 monc->con = NULL;
847
848 mutex_unlock(&monc->mutex);
849
850 /*
851 * flush msgr queue before we destroy ourselves to ensure that:
852 * - any work that references our embedded con is finished.
853 * - any osd_client or other work that may reference an authorizer
854 * finishes before we shut down the auth subsystem.
855 */
856 ceph_msgr_flush();
857
858 ceph_auth_destroy(monc->auth);
859
860 ceph_msg_put(monc->m_auth);
861 ceph_msg_put(monc->m_auth_reply);
862 ceph_msg_put(monc->m_subscribe);
863 ceph_msg_put(monc->m_subscribe_ack);
864
865 kfree(monc->monmap);
866}
867EXPORT_SYMBOL(ceph_monc_stop);
868
869static void handle_auth_reply(struct ceph_mon_client *monc,
870 struct ceph_msg *msg)
871{
872 int ret;
873 int was_auth = 0;
874
875 mutex_lock(&monc->mutex);
876 if (monc->auth->ops)
877 was_auth = monc->auth->ops->is_authenticated(monc->auth);
878 monc->pending_auth = 0;
879 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
880 msg->front.iov_len,
881 monc->m_auth->front.iov_base,
882 monc->m_auth->front_max);
883 if (ret < 0) {
884 monc->client->auth_err = ret;
885 wake_up_all(&monc->client->auth_wq);
886 } else if (ret > 0) {
887 __send_prepared_auth_request(monc, ret);
888 } else if (!was_auth && monc->auth->ops->is_authenticated(monc->auth)) {
889 dout("authenticated, starting session\n");
890
891 monc->client->msgr->inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
892 monc->client->msgr->inst.name.num =
893 cpu_to_le64(monc->auth->global_id);
894
895 __send_subscribe(monc);
896 __resend_generic_request(monc);
897 }
898 mutex_unlock(&monc->mutex);
899}
900
901static int __validate_auth(struct ceph_mon_client *monc)
902{
903 int ret;
904
905 if (monc->pending_auth)
906 return 0;
907
908 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
909 monc->m_auth->front_max);
910 if (ret <= 0)
911 return ret; /* either an error, or no need to authenticate */
912 __send_prepared_auth_request(monc, ret);
913 return 0;
914}
915
916int ceph_monc_validate_auth(struct ceph_mon_client *monc)
917{
918 int ret;
919
920 mutex_lock(&monc->mutex);
921 ret = __validate_auth(monc);
922 mutex_unlock(&monc->mutex);
923 return ret;
924}
925EXPORT_SYMBOL(ceph_monc_validate_auth);
926
927/*
928 * handle incoming message
929 */
930static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
931{
932 struct ceph_mon_client *monc = con->private;
933 int type = le16_to_cpu(msg->hdr.type);
934
935 if (!monc)
936 return;
937
938 switch (type) {
939 case CEPH_MSG_AUTH_REPLY:
940 handle_auth_reply(monc, msg);
941 break;
942
943 case CEPH_MSG_MON_SUBSCRIBE_ACK:
944 handle_subscribe_ack(monc, msg);
945 break;
946
947 case CEPH_MSG_STATFS_REPLY:
948 handle_statfs_reply(monc, msg);
949 break;
950
951 case CEPH_MSG_POOLOP_REPLY:
952 handle_poolop_reply(monc, msg);
953 break;
954
955 case CEPH_MSG_MON_MAP:
956 ceph_monc_handle_map(monc, msg);
957 break;
958
959 case CEPH_MSG_OSD_MAP:
960 ceph_osdc_handle_map(&monc->client->osdc, msg);
961 break;
962
963 default:
964 /* can the chained handler handle it? */
965 if (monc->client->extra_mon_dispatch &&
966 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
967 break;
968
969 pr_err("received unknown message type %d %s\n", type,
970 ceph_msg_type_name(type));
971 }
972 ceph_msg_put(msg);
973}
974
975/*
976 * Allocate memory for incoming message
977 */
978static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
979 struct ceph_msg_header *hdr,
980 int *skip)
981{
982 struct ceph_mon_client *monc = con->private;
983 int type = le16_to_cpu(hdr->type);
984 int front_len = le32_to_cpu(hdr->front_len);
985 struct ceph_msg *m = NULL;
986
987 *skip = 0;
988
989 switch (type) {
990 case CEPH_MSG_MON_SUBSCRIBE_ACK:
991 m = ceph_msg_get(monc->m_subscribe_ack);
992 break;
993 case CEPH_MSG_POOLOP_REPLY:
994 case CEPH_MSG_STATFS_REPLY:
995 return get_generic_reply(con, hdr, skip);
996 case CEPH_MSG_AUTH_REPLY:
997 m = ceph_msg_get(monc->m_auth_reply);
998 break;
999 case CEPH_MSG_MON_MAP:
1000 case CEPH_MSG_MDS_MAP:
1001 case CEPH_MSG_OSD_MAP:
1002 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1003 break;
1004 }
1005
1006 if (!m) {
1007 pr_info("alloc_msg unknown type %d\n", type);
1008 *skip = 1;
1009 }
1010 return m;
1011}
1012
1013/*
1014 * If the monitor connection resets, pick a new monitor and resubmit
1015 * any pending requests.
1016 */
1017static void mon_fault(struct ceph_connection *con)
1018{
1019 struct ceph_mon_client *monc = con->private;
1020
1021 if (!monc)
1022 return;
1023
1024 dout("mon_fault\n");
1025 mutex_lock(&monc->mutex);
1026 if (!con->private)
1027 goto out;
1028
1029 if (!monc->hunting)
1030 pr_info("mon%d %s session lost, "
1031 "hunting for new mon\n", monc->cur_mon,
1032 ceph_pr_addr(&monc->con->peer_addr.in_addr));
1033
1034 __close_session(monc);
1035 if (!monc->hunting) {
1036 /* start hunting */
1037 monc->hunting = true;
1038 __open_session(monc);
1039 } else {
1040 /* already hunting, let's wait a bit */
1041 __schedule_delayed(monc);
1042 }
1043out:
1044 mutex_unlock(&monc->mutex);
1045}
1046
1047static const struct ceph_connection_operations mon_con_ops = {
1048 .get = ceph_con_get,
1049 .put = ceph_con_put,
1050 .dispatch = dispatch,
1051 .fault = mon_fault,
1052 .alloc_msg = mon_alloc_msg,
1053};
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
39/*
40 * Decode a monmap blob (e.g., during mount).
41 */
42static 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;
86bad:
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 */
95int 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 */
108static 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 */
121static 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 */
138static 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 */
172static 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
206static 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
216void 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
223static 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 */
234static 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
248const 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 */
259static 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
309static 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;
336bad:
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 */
347static 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
368bool 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}
379EXPORT_SYMBOL(ceph_monc_want_map);
380
381/*
382 * Keep track of which maps we have
383 *
384 * @sub: one of CEPH_SUB_*
385 */
386static 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
401void 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}
407EXPORT_SYMBOL(ceph_monc_got_map);
408
409void 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}
415EXPORT_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 */
423int 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}
448EXPORT_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 */
454int 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}
464EXPORT_SYMBOL(ceph_monc_open_session);
465
466static 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 = NULL, *old = monc->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(monc->client, &monmap->fsid) < 0) {
488 kfree(monmap);
489 goto out;
490 }
491
492 client->monc.monmap = monmap;
493 kfree(old);
494
495 __ceph_monc_got_map(monc, CEPH_SUB_MONMAP, monc->monmap->epoch);
496 client->have_fsid = true;
497
498out:
499 mutex_unlock(&monc->mutex);
500 wake_up_all(&client->auth_wq);
501}
502
503/*
504 * generic requests (currently statfs, mon_get_version)
505 */
506DEFINE_RB_FUNCS(generic_request, struct ceph_mon_generic_request, tid, node)
507
508static 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
525static void put_generic_request(struct ceph_mon_generic_request *req)
526{
527 if (req)
528 kref_put(&req->kref, release_generic_request);
529}
530
531static void get_generic_request(struct ceph_mon_generic_request *req)
532{
533 kref_get(&req->kref);
534}
535
536static struct ceph_mon_generic_request *
537alloc_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
554static 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
565static 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
575static 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
586static void finish_generic_request(struct ceph_mon_generic_request *req)
587{
588 __finish_generic_request(req);
589 put_generic_request(req);
590}
591
592static 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
601static 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
619static 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
633static 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 */
665static 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
692bad:
693 pr_err("corrupt statfs reply, tid %llu\n", tid);
694 ceph_msg_dump(msg);
695}
696
697/*
698 * Do a synchronous statfs().
699 */
700int 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);
737out:
738 put_generic_request(req);
739 return ret;
740}
741EXPORT_SYMBOL(ceph_monc_do_statfs);
742
743static 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
774bad:
775 pr_err("corrupt mon_get_version reply, tid %llu\n", tid);
776 ceph_msg_dump(msg);
777}
778
779static 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
818err_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 */
828int 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}
845EXPORT_SYMBOL(ceph_monc_get_version);
846
847/*
848 * Send MMonGetVersion,
849 *
850 * @what: one of "mdsmap", "osdmap" or "monmap"
851 */
852int 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}
864EXPORT_SYMBOL(ceph_monc_get_version_async);
865
866static 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
894bad:
895 pr_err("corrupt mon_command ack, tid %llu\n", tid);
896 ceph_msg_dump(msg);
897}
898
899int 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
946out:
947 put_generic_request(req);
948 return ret;
949}
950EXPORT_SYMBOL(ceph_monc_blacklist_add);
951
952/*
953 * Resend pending generic requests.
954 */
955static 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 */
973static 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 */
1016static 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
1039int 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
1103out_auth_reply:
1104 ceph_msg_put(monc->m_auth_reply);
1105out_subscribe:
1106 ceph_msg_put(monc->m_subscribe);
1107out_subscribe_ack:
1108 ceph_msg_put(monc->m_subscribe_ack);
1109out_auth:
1110 ceph_auth_destroy(monc->auth);
1111out_monmap:
1112 kfree(monc->monmap);
1113out:
1114 return err;
1115}
1116EXPORT_SYMBOL(ceph_monc_init);
1117
1118void 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}
1147EXPORT_SYMBOL(ceph_monc_stop);
1148
1149static 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
1160static 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
1196out:
1197 mutex_unlock(&monc->mutex);
1198 if (monc->client->auth_err < 0)
1199 wake_up_all(&monc->client->auth_wq);
1200}
1201
1202static 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
1217int 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}
1226EXPORT_SYMBOL(ceph_monc_validate_auth);
1227
1228/*
1229 * handle incoming message
1230 */
1231static 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 if (!monc)
1237 return;
1238
1239 switch (type) {
1240 case CEPH_MSG_AUTH_REPLY:
1241 handle_auth_reply(monc, msg);
1242 break;
1243
1244 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1245 handle_subscribe_ack(monc, msg);
1246 break;
1247
1248 case CEPH_MSG_STATFS_REPLY:
1249 handle_statfs_reply(monc, msg);
1250 break;
1251
1252 case CEPH_MSG_MON_GET_VERSION_REPLY:
1253 handle_get_version_reply(monc, msg);
1254 break;
1255
1256 case CEPH_MSG_MON_COMMAND_ACK:
1257 handle_command_ack(monc, msg);
1258 break;
1259
1260 case CEPH_MSG_MON_MAP:
1261 ceph_monc_handle_map(monc, msg);
1262 break;
1263
1264 case CEPH_MSG_OSD_MAP:
1265 ceph_osdc_handle_map(&monc->client->osdc, msg);
1266 break;
1267
1268 default:
1269 /* can the chained handler handle it? */
1270 if (monc->client->extra_mon_dispatch &&
1271 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1272 break;
1273
1274 pr_err("received unknown message type %d %s\n", type,
1275 ceph_msg_type_name(type));
1276 }
1277 ceph_msg_put(msg);
1278}
1279
1280/*
1281 * Allocate memory for incoming message
1282 */
1283static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1284 struct ceph_msg_header *hdr,
1285 int *skip)
1286{
1287 struct ceph_mon_client *monc = con->private;
1288 int type = le16_to_cpu(hdr->type);
1289 int front_len = le32_to_cpu(hdr->front_len);
1290 struct ceph_msg *m = NULL;
1291
1292 *skip = 0;
1293
1294 switch (type) {
1295 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1296 m = ceph_msg_get(monc->m_subscribe_ack);
1297 break;
1298 case CEPH_MSG_STATFS_REPLY:
1299 case CEPH_MSG_MON_COMMAND_ACK:
1300 return get_generic_reply(con, hdr, skip);
1301 case CEPH_MSG_AUTH_REPLY:
1302 m = ceph_msg_get(monc->m_auth_reply);
1303 break;
1304 case CEPH_MSG_MON_GET_VERSION_REPLY:
1305 if (le64_to_cpu(hdr->tid) != 0)
1306 return get_generic_reply(con, hdr, skip);
1307
1308 /*
1309 * Older OSDs don't set reply tid even if the orignal
1310 * request had a non-zero tid. Work around this weirdness
1311 * by allocating a new message.
1312 */
1313 /* fall through */
1314 case CEPH_MSG_MON_MAP:
1315 case CEPH_MSG_MDS_MAP:
1316 case CEPH_MSG_OSD_MAP:
1317 case CEPH_MSG_FS_MAP_USER:
1318 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1319 if (!m)
1320 return NULL; /* ENOMEM--return skip == 0 */
1321 break;
1322 }
1323
1324 if (!m) {
1325 pr_info("alloc_msg unknown type %d\n", type);
1326 *skip = 1;
1327 } else if (front_len > m->front_alloc_len) {
1328 pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
1329 front_len, m->front_alloc_len,
1330 (unsigned int)con->peer_name.type,
1331 le64_to_cpu(con->peer_name.num));
1332 ceph_msg_put(m);
1333 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1334 }
1335
1336 return m;
1337}
1338
1339/*
1340 * If the monitor connection resets, pick a new monitor and resubmit
1341 * any pending requests.
1342 */
1343static void mon_fault(struct ceph_connection *con)
1344{
1345 struct ceph_mon_client *monc = con->private;
1346
1347 mutex_lock(&monc->mutex);
1348 dout("%s mon%d\n", __func__, monc->cur_mon);
1349 if (monc->cur_mon >= 0) {
1350 if (!monc->hunting) {
1351 dout("%s hunting for new mon\n", __func__);
1352 reopen_session(monc);
1353 __schedule_delayed(monc);
1354 } else {
1355 dout("%s already hunting\n", __func__);
1356 }
1357 }
1358 mutex_unlock(&monc->mutex);
1359}
1360
1361/*
1362 * We can ignore refcounting on the connection struct, as all references
1363 * will come from the messenger workqueue, which is drained prior to
1364 * mon_client destruction.
1365 */
1366static struct ceph_connection *con_get(struct ceph_connection *con)
1367{
1368 return con;
1369}
1370
1371static void con_put(struct ceph_connection *con)
1372{
1373}
1374
1375static const struct ceph_connection_operations mon_con_ops = {
1376 .get = con_get,
1377 .put = con_put,
1378 .dispatch = dispatch,
1379 .fault = mon_fault,
1380 .alloc_msg = mon_alloc_msg,
1381};