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libceph: create messenger with client
[linux-2.6-block.git] / net / ceph / mon_client.c
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CommitLineData
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/decode.h>
12
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 if (monc->con) {
120 dout("__close_session closing mon%d\n", monc->cur_mon);
121 ceph_con_revoke(monc->con, monc->m_auth);
122 ceph_con_close(monc->con);
123 monc->cur_mon = -1;
124 monc->pending_auth = 0;
125 ceph_auth_reset(monc->auth);
126 }
127}
128
129/*
130 * Open a session with a (new) monitor.
131 */
132static int __open_session(struct ceph_mon_client *monc)
133{
134 char r;
135 int ret;
136
137 if (monc->cur_mon < 0) {
138 get_random_bytes(&r, 1);
139 monc->cur_mon = r % monc->monmap->num_mon;
140 dout("open_session num=%d r=%d -> mon%d\n",
141 monc->monmap->num_mon, r, monc->cur_mon);
142 monc->sub_sent = 0;
143 monc->sub_renew_after = jiffies; /* i.e., expired */
144 monc->want_next_osdmap = !!monc->want_next_osdmap;
145
146 dout("open_session mon%d opening\n", monc->cur_mon);
147 monc->con->peer_name.type = CEPH_ENTITY_TYPE_MON;
148 monc->con->peer_name.num = cpu_to_le64(monc->cur_mon);
149 ceph_con_open(monc->con,
150 &monc->monmap->mon_inst[monc->cur_mon].addr);
151
152 /* initiatiate authentication handshake */
153 ret = ceph_auth_build_hello(monc->auth,
154 monc->m_auth->front.iov_base,
155 monc->m_auth->front_max);
156 __send_prepared_auth_request(monc, ret);
157 } else {
158 dout("open_session mon%d already open\n", monc->cur_mon);
159 }
160 return 0;
161}
162
163static bool __sub_expired(struct ceph_mon_client *monc)
164{
165 return time_after_eq(jiffies, monc->sub_renew_after);
166}
167
168/*
169 * Reschedule delayed work timer.
170 */
171static void __schedule_delayed(struct ceph_mon_client *monc)
172{
173 unsigned delay;
174
175 if (monc->cur_mon < 0 || __sub_expired(monc))
176 delay = 10 * HZ;
177 else
178 delay = 20 * HZ;
179 dout("__schedule_delayed after %u\n", delay);
180 schedule_delayed_work(&monc->delayed_work, delay);
181}
182
183/*
184 * Send subscribe request for mdsmap and/or osdmap.
185 */
186static void __send_subscribe(struct ceph_mon_client *monc)
187{
188 dout("__send_subscribe sub_sent=%u exp=%u want_osd=%d\n",
189 (unsigned)monc->sub_sent, __sub_expired(monc),
190 monc->want_next_osdmap);
191 if ((__sub_expired(monc) && !monc->sub_sent) ||
192 monc->want_next_osdmap == 1) {
193 struct ceph_msg *msg = monc->m_subscribe;
194 struct ceph_mon_subscribe_item *i;
195 void *p, *end;
196 int num;
197
198 p = msg->front.iov_base;
199 end = p + msg->front_max;
200
201 num = 1 + !!monc->want_next_osdmap + !!monc->want_mdsmap;
202 ceph_encode_32(&p, num);
203
204 if (monc->want_next_osdmap) {
205 dout("__send_subscribe to 'osdmap' %u\n",
206 (unsigned)monc->have_osdmap);
207 ceph_encode_string(&p, end, "osdmap", 6);
208 i = p;
209 i->have = cpu_to_le64(monc->have_osdmap);
210 i->onetime = 1;
211 p += sizeof(*i);
212 monc->want_next_osdmap = 2; /* requested */
213 }
214 if (monc->want_mdsmap) {
215 dout("__send_subscribe to 'mdsmap' %u+\n",
216 (unsigned)monc->have_mdsmap);
217 ceph_encode_string(&p, end, "mdsmap", 6);
218 i = p;
219 i->have = cpu_to_le64(monc->have_mdsmap);
220 i->onetime = 0;
221 p += sizeof(*i);
222 }
223 ceph_encode_string(&p, end, "monmap", 6);
224 i = p;
225 i->have = 0;
226 i->onetime = 0;
227 p += sizeof(*i);
228
229 msg->front.iov_len = p - msg->front.iov_base;
230 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
231 ceph_con_revoke(monc->con, msg);
232 ceph_con_send(monc->con, ceph_msg_get(msg));
233
234 monc->sub_sent = jiffies | 1; /* never 0 */
235 }
236}
237
238static void handle_subscribe_ack(struct ceph_mon_client *monc,
239 struct ceph_msg *msg)
240{
241 unsigned seconds;
242 struct ceph_mon_subscribe_ack *h = msg->front.iov_base;
243
244 if (msg->front.iov_len < sizeof(*h))
245 goto bad;
246 seconds = le32_to_cpu(h->duration);
247
248 mutex_lock(&monc->mutex);
249 if (monc->hunting) {
250 pr_info("mon%d %s session established\n",
251 monc->cur_mon,
252 ceph_pr_addr(&monc->con->peer_addr.in_addr));
253 monc->hunting = false;
254 }
255 dout("handle_subscribe_ack after %d seconds\n", seconds);
256 monc->sub_renew_after = monc->sub_sent + (seconds >> 1)*HZ - 1;
257 monc->sub_sent = 0;
258 mutex_unlock(&monc->mutex);
259 return;
260bad:
261 pr_err("got corrupt subscribe-ack msg\n");
262 ceph_msg_dump(msg);
263}
264
265/*
266 * Keep track of which maps we have
267 */
268int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 got)
269{
270 mutex_lock(&monc->mutex);
271 monc->have_mdsmap = got;
272 mutex_unlock(&monc->mutex);
273 return 0;
274}
275EXPORT_SYMBOL(ceph_monc_got_mdsmap);
276
277int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 got)
278{
279 mutex_lock(&monc->mutex);
280 monc->have_osdmap = got;
281 monc->want_next_osdmap = 0;
282 mutex_unlock(&monc->mutex);
283 return 0;
284}
285
286/*
287 * Register interest in the next osdmap
288 */
289void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc)
290{
291 dout("request_next_osdmap have %u\n", monc->have_osdmap);
292 mutex_lock(&monc->mutex);
293 if (!monc->want_next_osdmap)
294 monc->want_next_osdmap = 1;
295 if (monc->want_next_osdmap < 2)
296 __send_subscribe(monc);
297 mutex_unlock(&monc->mutex);
298}
299
300/*
301 *
302 */
303int ceph_monc_open_session(struct ceph_mon_client *monc)
304{
305 if (!monc->con) {
306 monc->con = kmalloc(sizeof(*monc->con), GFP_KERNEL);
307 if (!monc->con)
308 return -ENOMEM;
309 ceph_con_init(monc->client->msgr, monc->con);
310 monc->con->private = monc;
311 monc->con->ops = &mon_con_ops;
312 }
313
314 mutex_lock(&monc->mutex);
315 __open_session(monc);
316 __schedule_delayed(monc);
317 mutex_unlock(&monc->mutex);
318 return 0;
319}
320EXPORT_SYMBOL(ceph_monc_open_session);
321
322/*
323 * The monitor responds with mount ack indicate mount success. The
324 * included client ticket allows the client to talk to MDSs and OSDs.
325 */
326static void ceph_monc_handle_map(struct ceph_mon_client *monc,
327 struct ceph_msg *msg)
328{
329 struct ceph_client *client = monc->client;
330 struct ceph_monmap *monmap = NULL, *old = monc->monmap;
331 void *p, *end;
332
333 mutex_lock(&monc->mutex);
334
335 dout("handle_monmap\n");
336 p = msg->front.iov_base;
337 end = p + msg->front.iov_len;
338
339 monmap = ceph_monmap_decode(p, end);
340 if (IS_ERR(monmap)) {
341 pr_err("problem decoding monmap, %d\n",
342 (int)PTR_ERR(monmap));
343 goto out;
344 }
345
346 if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) {
347 kfree(monmap);
348 goto out;
349 }
350
351 client->monc.monmap = monmap;
352 kfree(old);
353
354out:
355 mutex_unlock(&monc->mutex);
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 if (!req->request)
533 goto out;
534 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 1024, GFP_NOFS);
535 if (!req->reply)
536 goto out;
537
538 /* fill out request */
539 h = req->request->front.iov_base;
540 h->monhdr.have_version = 0;
541 h->monhdr.session_mon = cpu_to_le16(-1);
542 h->monhdr.session_mon_tid = 0;
543 h->fsid = monc->monmap->fsid;
544
545 err = do_generic_request(monc, req);
546
547out:
548 kref_put(&req->kref, release_generic_request);
549 return err;
550}
551EXPORT_SYMBOL(ceph_monc_do_statfs);
552
553/*
554 * pool ops
555 */
556static int get_poolop_reply_buf(const char *src, size_t src_len,
557 char *dst, size_t dst_len)
558{
559 u32 buf_len;
560
561 if (src_len != sizeof(u32) + dst_len)
562 return -EINVAL;
563
564 buf_len = le32_to_cpu(*(u32 *)src);
565 if (buf_len != dst_len)
566 return -EINVAL;
567
568 memcpy(dst, src + sizeof(u32), dst_len);
569 return 0;
570}
571
572static void handle_poolop_reply(struct ceph_mon_client *monc,
573 struct ceph_msg *msg)
574{
575 struct ceph_mon_generic_request *req;
576 struct ceph_mon_poolop_reply *reply = msg->front.iov_base;
577 u64 tid = le64_to_cpu(msg->hdr.tid);
578
579 if (msg->front.iov_len < sizeof(*reply))
580 goto bad;
581 dout("handle_poolop_reply %p tid %llu\n", msg, tid);
582
583 mutex_lock(&monc->mutex);
584 req = __lookup_generic_req(monc, tid);
585 if (req) {
586 if (req->buf_len &&
587 get_poolop_reply_buf(msg->front.iov_base + sizeof(*reply),
588 msg->front.iov_len - sizeof(*reply),
589 req->buf, req->buf_len) < 0) {
590 mutex_unlock(&monc->mutex);
591 goto bad;
592 }
593 req->result = le32_to_cpu(reply->reply_code);
594 get_generic_request(req);
595 }
596 mutex_unlock(&monc->mutex);
597 if (req) {
598 complete(&req->completion);
599 put_generic_request(req);
600 }
601 return;
602
603bad:
604 pr_err("corrupt generic reply, tid %llu\n", tid);
605 ceph_msg_dump(msg);
606}
607
608/*
609 * Do a synchronous pool op.
610 */
611int ceph_monc_do_poolop(struct ceph_mon_client *monc, u32 op,
612 u32 pool, u64 snapid,
613 char *buf, int len)
614{
615 struct ceph_mon_generic_request *req;
616 struct ceph_mon_poolop *h;
617 int err;
618
619 req = kzalloc(sizeof(*req), GFP_NOFS);
620 if (!req)
621 return -ENOMEM;
622
623 kref_init(&req->kref);
624 req->buf = buf;
625 req->buf_len = len;
626 init_completion(&req->completion);
627
628 err = -ENOMEM;
629 req->request = ceph_msg_new(CEPH_MSG_POOLOP, sizeof(*h), GFP_NOFS);
630 if (!req->request)
631 goto out;
632 req->reply = ceph_msg_new(CEPH_MSG_POOLOP_REPLY, 1024, GFP_NOFS);
633 if (!req->reply)
634 goto out;
635
636 /* fill out request */
637 req->request->hdr.version = cpu_to_le16(2);
638 h = req->request->front.iov_base;
639 h->monhdr.have_version = 0;
640 h->monhdr.session_mon = cpu_to_le16(-1);
641 h->monhdr.session_mon_tid = 0;
642 h->fsid = monc->monmap->fsid;
643 h->pool = cpu_to_le32(pool);
644 h->op = cpu_to_le32(op);
645 h->auid = 0;
646 h->snapid = cpu_to_le64(snapid);
647 h->name_len = 0;
648
649 err = do_generic_request(monc, req);
650
651out:
652 kref_put(&req->kref, release_generic_request);
653 return err;
654}
655
656int ceph_monc_create_snapid(struct ceph_mon_client *monc,
657 u32 pool, u64 *snapid)
658{
659 return ceph_monc_do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP,
660 pool, 0, (char *)snapid, sizeof(*snapid));
661
662}
663EXPORT_SYMBOL(ceph_monc_create_snapid);
664
665int ceph_monc_delete_snapid(struct ceph_mon_client *monc,
666 u32 pool, u64 snapid)
667{
668 return ceph_monc_do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP,
669 pool, snapid, 0, 0);
670
671}
672
673/*
674 * Resend pending generic requests.
675 */
676static void __resend_generic_request(struct ceph_mon_client *monc)
677{
678 struct ceph_mon_generic_request *req;
679 struct rb_node *p;
680
681 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
682 req = rb_entry(p, struct ceph_mon_generic_request, node);
683 ceph_con_revoke(monc->con, req->request);
684 ceph_con_send(monc->con, ceph_msg_get(req->request));
685 }
686}
687
688/*
689 * Delayed work. If we haven't mounted yet, retry. Otherwise,
690 * renew/retry subscription as needed (in case it is timing out, or we
691 * got an ENOMEM). And keep the monitor connection alive.
692 */
693static void delayed_work(struct work_struct *work)
694{
695 struct ceph_mon_client *monc =
696 container_of(work, struct ceph_mon_client, delayed_work.work);
697
698 dout("monc delayed_work\n");
699 mutex_lock(&monc->mutex);
700 if (monc->hunting) {
701 __close_session(monc);
702 __open_session(monc); /* continue hunting */
703 } else {
704 ceph_con_keepalive(monc->con);
705
706 __validate_auth(monc);
707
708 if (monc->auth->ops->is_authenticated(monc->auth))
709 __send_subscribe(monc);
710 }
711 __schedule_delayed(monc);
712 mutex_unlock(&monc->mutex);
713}
714
715/*
716 * On startup, we build a temporary monmap populated with the IPs
717 * provided by mount(2).
718 */
719static int build_initial_monmap(struct ceph_mon_client *monc)
720{
721 struct ceph_options *opt = monc->client->options;
722 struct ceph_entity_addr *mon_addr = opt->mon_addr;
723 int num_mon = opt->num_mon;
724 int i;
725
726 /* build initial monmap */
727 monc->monmap = kzalloc(sizeof(*monc->monmap) +
728 num_mon*sizeof(monc->monmap->mon_inst[0]),
729 GFP_KERNEL);
730 if (!monc->monmap)
731 return -ENOMEM;
732 for (i = 0; i < num_mon; i++) {
733 monc->monmap->mon_inst[i].addr = mon_addr[i];
734 monc->monmap->mon_inst[i].addr.nonce = 0;
735 monc->monmap->mon_inst[i].name.type =
736 CEPH_ENTITY_TYPE_MON;
737 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
738 }
739 monc->monmap->num_mon = num_mon;
740 monc->have_fsid = false;
741 return 0;
742}
743
744int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
745{
746 int err = 0;
747
748 dout("init\n");
749 memset(monc, 0, sizeof(*monc));
750 monc->client = cl;
751 monc->monmap = NULL;
752 mutex_init(&monc->mutex);
753
754 err = build_initial_monmap(monc);
755 if (err)
756 goto out;
757
758 monc->con = NULL;
759
760 /* authentication */
761 monc->auth = ceph_auth_init(cl->options->name,
762 cl->options->key);
763 if (IS_ERR(monc->auth))
764 return PTR_ERR(monc->auth);
765 monc->auth->want_keys =
766 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
767 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
768
769 /* msgs */
770 err = -ENOMEM;
771 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
772 sizeof(struct ceph_mon_subscribe_ack),
773 GFP_NOFS);
774 if (!monc->m_subscribe_ack)
775 goto out_monmap;
776
777 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS);
778 if (!monc->m_subscribe)
779 goto out_subscribe_ack;
780
781 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS);
782 if (!monc->m_auth_reply)
783 goto out_subscribe;
784
785 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS);
786 monc->pending_auth = 0;
787 if (!monc->m_auth)
788 goto out_auth_reply;
789
790 monc->cur_mon = -1;
791 monc->hunting = true;
792 monc->sub_renew_after = jiffies;
793 monc->sub_sent = 0;
794
795 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
796 monc->generic_request_tree = RB_ROOT;
797 monc->num_generic_requests = 0;
798 monc->last_tid = 0;
799
800 monc->have_mdsmap = 0;
801 monc->have_osdmap = 0;
802 monc->want_next_osdmap = 1;
803 return 0;
804
805out_auth_reply:
806 ceph_msg_put(monc->m_auth_reply);
807out_subscribe:
808 ceph_msg_put(monc->m_subscribe);
809out_subscribe_ack:
810 ceph_msg_put(monc->m_subscribe_ack);
811out_monmap:
812 kfree(monc->monmap);
813out:
814 return err;
815}
816EXPORT_SYMBOL(ceph_monc_init);
817
818void ceph_monc_stop(struct ceph_mon_client *monc)
819{
820 dout("stop\n");
821 cancel_delayed_work_sync(&monc->delayed_work);
822
823 mutex_lock(&monc->mutex);
824 __close_session(monc);
825 if (monc->con) {
826 monc->con->private = NULL;
827 monc->con->ops->put(monc->con);
828 monc->con = NULL;
829 }
830 mutex_unlock(&monc->mutex);
831
832 ceph_auth_destroy(monc->auth);
833
834 ceph_msg_put(monc->m_auth);
835 ceph_msg_put(monc->m_auth_reply);
836 ceph_msg_put(monc->m_subscribe);
837 ceph_msg_put(monc->m_subscribe_ack);
838
839 kfree(monc->monmap);
840}
841EXPORT_SYMBOL(ceph_monc_stop);
842
843static void handle_auth_reply(struct ceph_mon_client *monc,
844 struct ceph_msg *msg)
845{
846 int ret;
847 int was_auth = 0;
848
849 mutex_lock(&monc->mutex);
850 if (monc->auth->ops)
851 was_auth = monc->auth->ops->is_authenticated(monc->auth);
852 monc->pending_auth = 0;
853 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
854 msg->front.iov_len,
855 monc->m_auth->front.iov_base,
856 monc->m_auth->front_max);
857 if (ret < 0) {
858 monc->client->auth_err = ret;
859 wake_up_all(&monc->client->auth_wq);
860 } else if (ret > 0) {
861 __send_prepared_auth_request(monc, ret);
862 } else if (!was_auth && monc->auth->ops->is_authenticated(monc->auth)) {
863 dout("authenticated, starting session\n");
864
865 monc->client->msgr->inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
866 monc->client->msgr->inst.name.num =
867 cpu_to_le64(monc->auth->global_id);
868
869 __send_subscribe(monc);
870 __resend_generic_request(monc);
871 }
872 mutex_unlock(&monc->mutex);
873}
874
875static int __validate_auth(struct ceph_mon_client *monc)
876{
877 int ret;
878
879 if (monc->pending_auth)
880 return 0;
881
882 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
883 monc->m_auth->front_max);
884 if (ret <= 0)
885 return ret; /* either an error, or no need to authenticate */
886 __send_prepared_auth_request(monc, ret);
887 return 0;
888}
889
890int ceph_monc_validate_auth(struct ceph_mon_client *monc)
891{
892 int ret;
893
894 mutex_lock(&monc->mutex);
895 ret = __validate_auth(monc);
896 mutex_unlock(&monc->mutex);
897 return ret;
898}
899EXPORT_SYMBOL(ceph_monc_validate_auth);
900
901/*
902 * handle incoming message
903 */
904static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
905{
906 struct ceph_mon_client *monc = con->private;
907 int type = le16_to_cpu(msg->hdr.type);
908
909 if (!monc)
910 return;
911
912 switch (type) {
913 case CEPH_MSG_AUTH_REPLY:
914 handle_auth_reply(monc, msg);
915 break;
916
917 case CEPH_MSG_MON_SUBSCRIBE_ACK:
918 handle_subscribe_ack(monc, msg);
919 break;
920
921 case CEPH_MSG_STATFS_REPLY:
922 handle_statfs_reply(monc, msg);
923 break;
924
925 case CEPH_MSG_POOLOP_REPLY:
926 handle_poolop_reply(monc, msg);
927 break;
928
929 case CEPH_MSG_MON_MAP:
930 ceph_monc_handle_map(monc, msg);
931 break;
932
933 case CEPH_MSG_OSD_MAP:
934 ceph_osdc_handle_map(&monc->client->osdc, msg);
935 break;
936
937 default:
938 /* can the chained handler handle it? */
939 if (monc->client->extra_mon_dispatch &&
940 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
941 break;
942
943 pr_err("received unknown message type %d %s\n", type,
944 ceph_msg_type_name(type));
945 }
946 ceph_msg_put(msg);
947}
948
949/*
950 * Allocate memory for incoming message
951 */
952static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
953 struct ceph_msg_header *hdr,
954 int *skip)
955{
956 struct ceph_mon_client *monc = con->private;
957 int type = le16_to_cpu(hdr->type);
958 int front_len = le32_to_cpu(hdr->front_len);
959 struct ceph_msg *m = NULL;
960
961 *skip = 0;
962
963 switch (type) {
964 case CEPH_MSG_MON_SUBSCRIBE_ACK:
965 m = ceph_msg_get(monc->m_subscribe_ack);
966 break;
967 case CEPH_MSG_POOLOP_REPLY:
968 case CEPH_MSG_STATFS_REPLY:
969 return get_generic_reply(con, hdr, skip);
970 case CEPH_MSG_AUTH_REPLY:
971 m = ceph_msg_get(monc->m_auth_reply);
972 break;
973 case CEPH_MSG_MON_MAP:
974 case CEPH_MSG_MDS_MAP:
975 case CEPH_MSG_OSD_MAP:
976 m = ceph_msg_new(type, front_len, GFP_NOFS);
977 break;
978 }
979
980 if (!m) {
981 pr_info("alloc_msg unknown type %d\n", type);
982 *skip = 1;
983 }
984 return m;
985}
986
987/*
988 * If the monitor connection resets, pick a new monitor and resubmit
989 * any pending requests.
990 */
991static void mon_fault(struct ceph_connection *con)
992{
993 struct ceph_mon_client *monc = con->private;
994
995 if (!monc)
996 return;
997
998 dout("mon_fault\n");
999 mutex_lock(&monc->mutex);
1000 if (!con->private)
1001 goto out;
1002
1003 if (monc->con && !monc->hunting)
1004 pr_info("mon%d %s session lost, "
1005 "hunting for new mon\n", monc->cur_mon,
1006 ceph_pr_addr(&monc->con->peer_addr.in_addr));
1007
1008 __close_session(monc);
1009 if (!monc->hunting) {
1010 /* start hunting */
1011 monc->hunting = true;
1012 __open_session(monc);
1013 } else {
1014 /* already hunting, let's wait a bit */
1015 __schedule_delayed(monc);
1016 }
1017out:
1018 mutex_unlock(&monc->mutex);
1019}
1020
1021static const struct ceph_connection_operations mon_con_ops = {
1022 .get = ceph_con_get,
1023 .put = ceph_con_put,
1024 .dispatch = dispatch,
1025 .fault = mon_fault,
1026 .alloc_msg = mon_alloc_msg,
1027};
Linux 6.x block layer and io_uring tree(s)