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ceph-rbd: osdc support for osd call and rollback operations
[linux-2.6-block.git] / fs / ceph / mon_client.c
... / ...
CommitLineData
1#include "ceph_debug.h"
2
3#include <linux/types.h>
4#include <linux/slab.h>
5#include <linux/random.h>
6#include <linux/sched.h>
7
8#include "mon_client.h"
9#include "super.h"
10#include "auth.h"
11#include "decode.h"
12
13/*
14 * Interact with Ceph monitor cluster. Handle requests for new map
15 * versions, and periodically resend as needed. Also implement
16 * statfs() and umount().
17 *
18 * A small cluster of Ceph "monitors" are responsible for managing critical
19 * cluster configuration and state information. An odd number (e.g., 3, 5)
20 * of cmon daemons use a modified version of the Paxos part-time parliament
21 * algorithm to manage the MDS map (mds cluster membership), OSD map, and
22 * list of clients who have mounted the file system.
23 *
24 * We maintain an open, active session with a monitor at all times in order to
25 * receive timely MDSMap updates. We periodically send a keepalive byte on the
26 * TCP socket to ensure we detect a failure. If the connection does break, we
27 * randomly hunt for a new monitor. Once the connection is reestablished, we
28 * resend any outstanding requests.
29 */
30
31static const struct ceph_connection_operations mon_con_ops;
32
33static int __validate_auth(struct ceph_mon_client *monc);
34
35/*
36 * Decode a monmap blob (e.g., during mount).
37 */
38struct ceph_monmap *ceph_monmap_decode(void *p, void *end)
39{
40 struct ceph_monmap *m = NULL;
41 int i, err = -EINVAL;
42 struct ceph_fsid fsid;
43 u32 epoch, num_mon;
44 u16 version;
45 u32 len;
46
47 ceph_decode_32_safe(&p, end, len, bad);
48 ceph_decode_need(&p, end, len, bad);
49
50 dout("monmap_decode %p %p len %d\n", p, end, (int)(end-p));
51
52 ceph_decode_16_safe(&p, end, version, bad);
53
54 ceph_decode_need(&p, end, sizeof(fsid) + 2*sizeof(u32), bad);
55 ceph_decode_copy(&p, &fsid, sizeof(fsid));
56 epoch = ceph_decode_32(&p);
57
58 num_mon = ceph_decode_32(&p);
59 ceph_decode_need(&p, end, num_mon*sizeof(m->mon_inst[0]), bad);
60
61 if (num_mon >= CEPH_MAX_MON)
62 goto bad;
63 m = kmalloc(sizeof(*m) + sizeof(m->mon_inst[0])*num_mon, GFP_NOFS);
64 if (m == NULL)
65 return ERR_PTR(-ENOMEM);
66 m->fsid = fsid;
67 m->epoch = epoch;
68 m->num_mon = num_mon;
69 ceph_decode_copy(&p, m->mon_inst, num_mon*sizeof(m->mon_inst[0]));
70 for (i = 0; i < num_mon; i++)
71 ceph_decode_addr(&m->mon_inst[i].addr);
72
73 dout("monmap_decode epoch %d, num_mon %d\n", m->epoch,
74 m->num_mon);
75 for (i = 0; i < m->num_mon; i++)
76 dout("monmap_decode mon%d is %s\n", i,
77 pr_addr(&m->mon_inst[i].addr.in_addr));
78 return m;
79
80bad:
81 dout("monmap_decode failed with %d\n", err);
82 kfree(m);
83 return ERR_PTR(err);
84}
85
86/*
87 * return true if *addr is included in the monmap.
88 */
89int ceph_monmap_contains(struct ceph_monmap *m, struct ceph_entity_addr *addr)
90{
91 int i;
92
93 for (i = 0; i < m->num_mon; i++)
94 if (memcmp(addr, &m->mon_inst[i].addr, sizeof(*addr)) == 0)
95 return 1;
96 return 0;
97}
98
99/*
100 * Send an auth request.
101 */
102static void __send_prepared_auth_request(struct ceph_mon_client *monc, int len)
103{
104 monc->pending_auth = 1;
105 monc->m_auth->front.iov_len = len;
106 monc->m_auth->hdr.front_len = cpu_to_le32(len);
107 ceph_con_revoke(monc->con, monc->m_auth);
108 ceph_msg_get(monc->m_auth); /* keep our ref */
109 ceph_con_send(monc->con, monc->m_auth);
110}
111
112/*
113 * Close monitor session, if any.
114 */
115static void __close_session(struct ceph_mon_client *monc)
116{
117 if (monc->con) {
118 dout("__close_session closing mon%d\n", monc->cur_mon);
119 ceph_con_revoke(monc->con, monc->m_auth);
120 ceph_con_close(monc->con);
121 monc->cur_mon = -1;
122 monc->pending_auth = 0;
123 ceph_auth_reset(monc->auth);
124 }
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 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)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
195 p = msg->front.iov_base;
196 end = p + msg->front_max;
197
198 dout("__send_subscribe to 'mdsmap' %u+\n",
199 (unsigned)monc->have_mdsmap);
200 if (monc->want_next_osdmap) {
201 dout("__send_subscribe to 'osdmap' %u\n",
202 (unsigned)monc->have_osdmap);
203 ceph_encode_32(&p, 3);
204 ceph_encode_string(&p, end, "osdmap", 6);
205 i = p;
206 i->have = cpu_to_le64(monc->have_osdmap);
207 i->onetime = 1;
208 p += sizeof(*i);
209 monc->want_next_osdmap = 2; /* requested */
210 } else {
211 ceph_encode_32(&p, 2);
212 }
213 ceph_encode_string(&p, end, "mdsmap", 6);
214 i = p;
215 i->have = cpu_to_le64(monc->have_mdsmap);
216 i->onetime = 0;
217 p += sizeof(*i);
218 ceph_encode_string(&p, end, "monmap", 6);
219 i = p;
220 i->have = 0;
221 i->onetime = 0;
222 p += sizeof(*i);
223
224 msg->front.iov_len = p - msg->front.iov_base;
225 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
226 ceph_con_revoke(monc->con, msg);
227 ceph_con_send(monc->con, ceph_msg_get(msg));
228
229 monc->sub_sent = jiffies | 1; /* never 0 */
230 }
231}
232
233static void handle_subscribe_ack(struct ceph_mon_client *monc,
234 struct ceph_msg *msg)
235{
236 unsigned seconds;
237 struct ceph_mon_subscribe_ack *h = msg->front.iov_base;
238
239 if (msg->front.iov_len < sizeof(*h))
240 goto bad;
241 seconds = le32_to_cpu(h->duration);
242
243 mutex_lock(&monc->mutex);
244 if (monc->hunting) {
245 pr_info("mon%d %s session established\n",
246 monc->cur_mon, pr_addr(&monc->con->peer_addr.in_addr));
247 monc->hunting = false;
248 }
249 dout("handle_subscribe_ack after %d seconds\n", seconds);
250 monc->sub_renew_after = monc->sub_sent + (seconds >> 1)*HZ - 1;
251 monc->sub_sent = 0;
252 mutex_unlock(&monc->mutex);
253 return;
254bad:
255 pr_err("got corrupt subscribe-ack msg\n");
256 ceph_msg_dump(msg);
257}
258
259/*
260 * Keep track of which maps we have
261 */
262int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 got)
263{
264 mutex_lock(&monc->mutex);
265 monc->have_mdsmap = got;
266 mutex_unlock(&monc->mutex);
267 return 0;
268}
269
270int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 got)
271{
272 mutex_lock(&monc->mutex);
273 monc->have_osdmap = got;
274 monc->want_next_osdmap = 0;
275 mutex_unlock(&monc->mutex);
276 return 0;
277}
278
279/*
280 * Register interest in the next osdmap
281 */
282void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc)
283{
284 dout("request_next_osdmap have %u\n", monc->have_osdmap);
285 mutex_lock(&monc->mutex);
286 if (!monc->want_next_osdmap)
287 monc->want_next_osdmap = 1;
288 if (monc->want_next_osdmap < 2)
289 __send_subscribe(monc);
290 mutex_unlock(&monc->mutex);
291}
292
293/*
294 *
295 */
296int ceph_monc_open_session(struct ceph_mon_client *monc)
297{
298 if (!monc->con) {
299 monc->con = kmalloc(sizeof(*monc->con), GFP_KERNEL);
300 if (!monc->con)
301 return -ENOMEM;
302 ceph_con_init(monc->client->msgr, monc->con);
303 monc->con->private = monc;
304 monc->con->ops = &mon_con_ops;
305 }
306
307 mutex_lock(&monc->mutex);
308 __open_session(monc);
309 __schedule_delayed(monc);
310 mutex_unlock(&monc->mutex);
311 return 0;
312}
313
314/*
315 * The monitor responds with mount ack indicate mount success. The
316 * included client ticket allows the client to talk to MDSs and OSDs.
317 */
318static void ceph_monc_handle_map(struct ceph_mon_client *monc,
319 struct ceph_msg *msg)
320{
321 struct ceph_client *client = monc->client;
322 struct ceph_monmap *monmap = NULL, *old = monc->monmap;
323 void *p, *end;
324
325 mutex_lock(&monc->mutex);
326
327 dout("handle_monmap\n");
328 p = msg->front.iov_base;
329 end = p + msg->front.iov_len;
330
331 monmap = ceph_monmap_decode(p, end);
332 if (IS_ERR(monmap)) {
333 pr_err("problem decoding monmap, %d\n",
334 (int)PTR_ERR(monmap));
335 goto out;
336 }
337
338 if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) {
339 kfree(monmap);
340 goto out;
341 }
342
343 client->monc.monmap = monmap;
344 kfree(old);
345
346out:
347 mutex_unlock(&monc->mutex);
348 wake_up_all(&client->auth_wq);
349}
350
351/*
352 * generic requests (e.g., statfs, poolop)
353 */
354static struct ceph_mon_generic_request *__lookup_generic_req(
355 struct ceph_mon_client *monc, u64 tid)
356{
357 struct ceph_mon_generic_request *req;
358 struct rb_node *n = monc->generic_request_tree.rb_node;
359
360 while (n) {
361 req = rb_entry(n, struct ceph_mon_generic_request, node);
362 if (tid < req->tid)
363 n = n->rb_left;
364 else if (tid > req->tid)
365 n = n->rb_right;
366 else
367 return req;
368 }
369 return NULL;
370}
371
372static void __insert_generic_request(struct ceph_mon_client *monc,
373 struct ceph_mon_generic_request *new)
374{
375 struct rb_node **p = &monc->generic_request_tree.rb_node;
376 struct rb_node *parent = NULL;
377 struct ceph_mon_generic_request *req = NULL;
378
379 while (*p) {
380 parent = *p;
381 req = rb_entry(parent, struct ceph_mon_generic_request, node);
382 if (new->tid < req->tid)
383 p = &(*p)->rb_left;
384 else if (new->tid > req->tid)
385 p = &(*p)->rb_right;
386 else
387 BUG();
388 }
389
390 rb_link_node(&new->node, parent, p);
391 rb_insert_color(&new->node, &monc->generic_request_tree);
392}
393
394static void release_generic_request(struct kref *kref)
395{
396 struct ceph_mon_generic_request *req =
397 container_of(kref, struct ceph_mon_generic_request, kref);
398
399 if (req->reply)
400 ceph_msg_put(req->reply);
401 if (req->request)
402 ceph_msg_put(req->request);
403
404 kfree(req);
405}
406
407static void put_generic_request(struct ceph_mon_generic_request *req)
408{
409 kref_put(&req->kref, release_generic_request);
410}
411
412static void get_generic_request(struct ceph_mon_generic_request *req)
413{
414 kref_get(&req->kref);
415}
416
417static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
418 struct ceph_msg_header *hdr,
419 int *skip)
420{
421 struct ceph_mon_client *monc = con->private;
422 struct ceph_mon_generic_request *req;
423 u64 tid = le64_to_cpu(hdr->tid);
424 struct ceph_msg *m;
425
426 mutex_lock(&monc->mutex);
427 req = __lookup_generic_req(monc, tid);
428 if (!req) {
429 dout("get_generic_reply %lld dne\n", tid);
430 *skip = 1;
431 m = NULL;
432 } else {
433 dout("get_generic_reply %lld got %p\n", tid, req->reply);
434 m = ceph_msg_get(req->reply);
435 /*
436 * we don't need to track the connection reading into
437 * this reply because we only have one open connection
438 * at a time, ever.
439 */
440 }
441 mutex_unlock(&monc->mutex);
442 return m;
443}
444
445static int do_generic_request(struct ceph_mon_client *monc,
446 struct ceph_mon_generic_request *req)
447{
448 int err;
449
450 /* register request */
451 mutex_lock(&monc->mutex);
452 req->tid = ++monc->last_tid;
453 req->request->hdr.tid = cpu_to_le64(req->tid);
454 __insert_generic_request(monc, req);
455 monc->num_generic_requests++;
456 ceph_con_send(monc->con, ceph_msg_get(req->request));
457 mutex_unlock(&monc->mutex);
458
459 err = wait_for_completion_interruptible(&req->completion);
460
461 mutex_lock(&monc->mutex);
462 rb_erase(&req->node, &monc->generic_request_tree);
463 monc->num_generic_requests--;
464 mutex_unlock(&monc->mutex);
465
466 if (!err)
467 err = req->result;
468 return err;
469}
470
471/*
472 * statfs
473 */
474static void handle_statfs_reply(struct ceph_mon_client *monc,
475 struct ceph_msg *msg)
476{
477 struct ceph_mon_generic_request *req;
478 struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
479 u64 tid = le64_to_cpu(msg->hdr.tid);
480
481 if (msg->front.iov_len != sizeof(*reply))
482 goto bad;
483 dout("handle_statfs_reply %p tid %llu\n", msg, tid);
484
485 mutex_lock(&monc->mutex);
486 req = __lookup_generic_req(monc, tid);
487 if (req) {
488 *(struct ceph_statfs *)req->buf = reply->st;
489 req->result = 0;
490 get_generic_request(req);
491 }
492 mutex_unlock(&monc->mutex);
493 if (req) {
494 complete_all(&req->completion);
495 put_generic_request(req);
496 }
497 return;
498
499bad:
500 pr_err("corrupt generic reply, tid %llu\n", tid);
501 ceph_msg_dump(msg);
502}
503
504/*
505 * Do a synchronous statfs().
506 */
507int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf)
508{
509 struct ceph_mon_generic_request *req;
510 struct ceph_mon_statfs *h;
511 int err;
512
513 req = kzalloc(sizeof(*req), GFP_NOFS);
514 if (!req)
515 return -ENOMEM;
516
517 kref_init(&req->kref);
518 req->buf = buf;
519 req->buf_len = sizeof(*buf);
520 init_completion(&req->completion);
521
522 err = -ENOMEM;
523 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS);
524 if (!req->request)
525 goto out;
526 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 1024, GFP_NOFS);
527 if (!req->reply)
528 goto out;
529
530 /* fill out request */
531 h = req->request->front.iov_base;
532 h->monhdr.have_version = 0;
533 h->monhdr.session_mon = cpu_to_le16(-1);
534 h->monhdr.session_mon_tid = 0;
535 h->fsid = monc->monmap->fsid;
536
537 err = do_generic_request(monc, req);
538
539out:
540 kref_put(&req->kref, release_generic_request);
541 return err;
542}
543
544/*
545 * pool ops
546 */
547static int get_poolop_reply_buf(const char *src, size_t src_len,
548 char *dst, size_t dst_len)
549{
550 u32 buf_len;
551
552 if (src_len != sizeof(u32) + dst_len)
553 return -EINVAL;
554
555 buf_len = le32_to_cpu(*(u32 *)src);
556 if (buf_len != dst_len)
557 return -EINVAL;
558
559 memcpy(dst, src + sizeof(u32), dst_len);
560 return 0;
561}
562
563static void handle_poolop_reply(struct ceph_mon_client *monc,
564 struct ceph_msg *msg)
565{
566 struct ceph_mon_generic_request *req;
567 struct ceph_mon_poolop_reply *reply = msg->front.iov_base;
568 u64 tid = le64_to_cpu(msg->hdr.tid);
569
570 if (msg->front.iov_len < sizeof(*reply))
571 goto bad;
572 dout("handle_poolop_reply %p tid %llu\n", msg, tid);
573
574 mutex_lock(&monc->mutex);
575 req = __lookup_generic_req(monc, tid);
576 if (req) {
577 if (req->buf_len &&
578 get_poolop_reply_buf(msg->front.iov_base + sizeof(*reply),
579 msg->front.iov_len - sizeof(*reply),
580 req->buf, req->buf_len) < 0) {
581 mutex_unlock(&monc->mutex);
582 goto bad;
583 }
584 req->result = le32_to_cpu(reply->reply_code);
585 get_generic_request(req);
586 }
587 mutex_unlock(&monc->mutex);
588 if (req) {
589 complete(&req->completion);
590 put_generic_request(req);
591 }
592 return;
593
594bad:
595 pr_err("corrupt generic reply, tid %llu\n", tid);
596 ceph_msg_dump(msg);
597}
598
599/*
600 * Do a synchronous pool op.
601 */
602int ceph_monc_do_poolop(struct ceph_mon_client *monc, u32 op,
603 u32 pool, u64 snapid,
604 char *buf, int len)
605{
606 struct ceph_mon_generic_request *req;
607 struct ceph_mon_poolop *h;
608 int err;
609
610 req = kzalloc(sizeof(*req), GFP_NOFS);
611 if (!req)
612 return -ENOMEM;
613
614 kref_init(&req->kref);
615 req->buf = buf;
616 req->buf_len = len;
617 init_completion(&req->completion);
618
619 err = -ENOMEM;
620 req->request = ceph_msg_new(CEPH_MSG_POOLOP, sizeof(*h), GFP_NOFS);
621 if (!req->request)
622 goto out;
623 req->reply = ceph_msg_new(CEPH_MSG_POOLOP_REPLY, 1024, GFP_NOFS);
624 if (!req->reply)
625 goto out;
626
627 /* fill out request */
628 req->request->hdr.version = cpu_to_le16(2);
629 h = req->request->front.iov_base;
630 h->monhdr.have_version = 0;
631 h->monhdr.session_mon = cpu_to_le16(-1);
632 h->monhdr.session_mon_tid = 0;
633 h->fsid = monc->monmap->fsid;
634 h->pool = cpu_to_le32(pool);
635 h->op = cpu_to_le32(op);
636 h->auid = 0;
637 h->snapid = cpu_to_le64(snapid);
638 h->name_len = 0;
639
640 err = do_generic_request(monc, req);
641
642out:
643 kref_put(&req->kref, release_generic_request);
644 return err;
645}
646
647int ceph_monc_create_snapid(struct ceph_mon_client *monc,
648 u32 pool, u64 *snapid)
649{
650 return ceph_monc_do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP,
651 pool, 0, (char *)snapid, sizeof(*snapid));
652
653}
654
655int ceph_monc_delete_snapid(struct ceph_mon_client *monc,
656 u32 pool, u64 snapid)
657{
658 return ceph_monc_do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP,
659 pool, snapid, 0, 0);
660
661}
662
663/*
664 * Resend pending generic requests.
665 */
666static void __resend_generic_request(struct ceph_mon_client *monc)
667{
668 struct ceph_mon_generic_request *req;
669 struct rb_node *p;
670
671 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
672 req = rb_entry(p, struct ceph_mon_generic_request, node);
673 ceph_con_revoke(monc->con, req->request);
674 ceph_con_send(monc->con, ceph_msg_get(req->request));
675 }
676}
677
678/*
679 * Delayed work. If we haven't mounted yet, retry. Otherwise,
680 * renew/retry subscription as needed (in case it is timing out, or we
681 * got an ENOMEM). And keep the monitor connection alive.
682 */
683static void delayed_work(struct work_struct *work)
684{
685 struct ceph_mon_client *monc =
686 container_of(work, struct ceph_mon_client, delayed_work.work);
687
688 dout("monc delayed_work\n");
689 mutex_lock(&monc->mutex);
690 if (monc->hunting) {
691 __close_session(monc);
692 __open_session(monc); /* continue hunting */
693 } else {
694 ceph_con_keepalive(monc->con);
695
696 __validate_auth(monc);
697
698 if (monc->auth->ops->is_authenticated(monc->auth))
699 __send_subscribe(monc);
700 }
701 __schedule_delayed(monc);
702 mutex_unlock(&monc->mutex);
703}
704
705/*
706 * On startup, we build a temporary monmap populated with the IPs
707 * provided by mount(2).
708 */
709static int build_initial_monmap(struct ceph_mon_client *monc)
710{
711 struct ceph_mount_args *args = monc->client->mount_args;
712 struct ceph_entity_addr *mon_addr = args->mon_addr;
713 int num_mon = args->num_mon;
714 int i;
715
716 /* build initial monmap */
717 monc->monmap = kzalloc(sizeof(*monc->monmap) +
718 num_mon*sizeof(monc->monmap->mon_inst[0]),
719 GFP_KERNEL);
720 if (!monc->monmap)
721 return -ENOMEM;
722 for (i = 0; i < num_mon; i++) {
723 monc->monmap->mon_inst[i].addr = mon_addr[i];
724 monc->monmap->mon_inst[i].addr.nonce = 0;
725 monc->monmap->mon_inst[i].name.type =
726 CEPH_ENTITY_TYPE_MON;
727 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
728 }
729 monc->monmap->num_mon = num_mon;
730 monc->have_fsid = false;
731
732 /* release addr memory */
733 kfree(args->mon_addr);
734 args->mon_addr = NULL;
735 args->num_mon = 0;
736 return 0;
737}
738
739int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
740{
741 int err = 0;
742
743 dout("init\n");
744 memset(monc, 0, sizeof(*monc));
745 monc->client = cl;
746 monc->monmap = NULL;
747 mutex_init(&monc->mutex);
748
749 err = build_initial_monmap(monc);
750 if (err)
751 goto out;
752
753 monc->con = NULL;
754
755 /* authentication */
756 monc->auth = ceph_auth_init(cl->mount_args->name,
757 cl->mount_args->secret);
758 if (IS_ERR(monc->auth))
759 return PTR_ERR(monc->auth);
760 monc->auth->want_keys =
761 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
762 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
763
764 /* msgs */
765 err = -ENOMEM;
766 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
767 sizeof(struct ceph_mon_subscribe_ack),
768 GFP_NOFS);
769 if (!monc->m_subscribe_ack)
770 goto out_monmap;
771
772 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS);
773 if (!monc->m_subscribe)
774 goto out_subscribe_ack;
775
776 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS);
777 if (!monc->m_auth_reply)
778 goto out_subscribe;
779
780 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS);
781 monc->pending_auth = 0;
782 if (!monc->m_auth)
783 goto out_auth_reply;
784
785 monc->cur_mon = -1;
786 monc->hunting = true;
787 monc->sub_renew_after = jiffies;
788 monc->sub_sent = 0;
789
790 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
791 monc->generic_request_tree = RB_ROOT;
792 monc->num_generic_requests = 0;
793 monc->last_tid = 0;
794
795 monc->have_mdsmap = 0;
796 monc->have_osdmap = 0;
797 monc->want_next_osdmap = 1;
798 return 0;
799
800out_auth_reply:
801 ceph_msg_put(monc->m_auth_reply);
802out_subscribe:
803 ceph_msg_put(monc->m_subscribe);
804out_subscribe_ack:
805 ceph_msg_put(monc->m_subscribe_ack);
806out_monmap:
807 kfree(monc->monmap);
808out:
809 return err;
810}
811
812void ceph_monc_stop(struct ceph_mon_client *monc)
813{
814 dout("stop\n");
815 cancel_delayed_work_sync(&monc->delayed_work);
816
817 mutex_lock(&monc->mutex);
818 __close_session(monc);
819 if (monc->con) {
820 monc->con->private = NULL;
821 monc->con->ops->put(monc->con);
822 monc->con = NULL;
823 }
824 mutex_unlock(&monc->mutex);
825
826 ceph_auth_destroy(monc->auth);
827
828 ceph_msg_put(monc->m_auth);
829 ceph_msg_put(monc->m_auth_reply);
830 ceph_msg_put(monc->m_subscribe);
831 ceph_msg_put(monc->m_subscribe_ack);
832
833 kfree(monc->monmap);
834}
835
836static void handle_auth_reply(struct ceph_mon_client *monc,
837 struct ceph_msg *msg)
838{
839 int ret;
840 int was_auth = 0;
841
842 mutex_lock(&monc->mutex);
843 if (monc->auth->ops)
844 was_auth = monc->auth->ops->is_authenticated(monc->auth);
845 monc->pending_auth = 0;
846 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
847 msg->front.iov_len,
848 monc->m_auth->front.iov_base,
849 monc->m_auth->front_max);
850 if (ret < 0) {
851 monc->client->auth_err = ret;
852 wake_up_all(&monc->client->auth_wq);
853 } else if (ret > 0) {
854 __send_prepared_auth_request(monc, ret);
855 } else if (!was_auth && monc->auth->ops->is_authenticated(monc->auth)) {
856 dout("authenticated, starting session\n");
857
858 monc->client->msgr->inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
859 monc->client->msgr->inst.name.num =
860 cpu_to_le64(monc->auth->global_id);
861
862 __send_subscribe(monc);
863 __resend_generic_request(monc);
864 }
865 mutex_unlock(&monc->mutex);
866}
867
868static int __validate_auth(struct ceph_mon_client *monc)
869{
870 int ret;
871
872 if (monc->pending_auth)
873 return 0;
874
875 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
876 monc->m_auth->front_max);
877 if (ret <= 0)
878 return ret; /* either an error, or no need to authenticate */
879 __send_prepared_auth_request(monc, ret);
880 return 0;
881}
882
883int ceph_monc_validate_auth(struct ceph_mon_client *monc)
884{
885 int ret;
886
887 mutex_lock(&monc->mutex);
888 ret = __validate_auth(monc);
889 mutex_unlock(&monc->mutex);
890 return ret;
891}
892
893/*
894 * handle incoming message
895 */
896static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
897{
898 struct ceph_mon_client *monc = con->private;
899 int type = le16_to_cpu(msg->hdr.type);
900
901 if (!monc)
902 return;
903
904 switch (type) {
905 case CEPH_MSG_AUTH_REPLY:
906 handle_auth_reply(monc, msg);
907 break;
908
909 case CEPH_MSG_MON_SUBSCRIBE_ACK:
910 handle_subscribe_ack(monc, msg);
911 break;
912
913 case CEPH_MSG_STATFS_REPLY:
914 handle_statfs_reply(monc, msg);
915 break;
916
917 case CEPH_MSG_POOLOP_REPLY:
918 handle_poolop_reply(monc, msg);
919 break;
920
921 case CEPH_MSG_MON_MAP:
922 ceph_monc_handle_map(monc, msg);
923 break;
924
925 case CEPH_MSG_MDS_MAP:
926 ceph_mdsc_handle_map(&monc->client->mdsc, msg);
927 break;
928
929 case CEPH_MSG_OSD_MAP:
930 ceph_osdc_handle_map(&monc->client->osdc, msg);
931 break;
932
933 default:
934 pr_err("received unknown message type %d %s\n", type,
935 ceph_msg_type_name(type));
936 }
937 ceph_msg_put(msg);
938}
939
940/*
941 * Allocate memory for incoming message
942 */
943static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
944 struct ceph_msg_header *hdr,
945 int *skip)
946{
947 struct ceph_mon_client *monc = con->private;
948 int type = le16_to_cpu(hdr->type);
949 int front_len = le32_to_cpu(hdr->front_len);
950 struct ceph_msg *m = NULL;
951
952 *skip = 0;
953
954 switch (type) {
955 case CEPH_MSG_MON_SUBSCRIBE_ACK:
956 m = ceph_msg_get(monc->m_subscribe_ack);
957 break;
958 case CEPH_MSG_POOLOP_REPLY:
959 case CEPH_MSG_STATFS_REPLY:
960 return get_generic_reply(con, hdr, skip);
961 case CEPH_MSG_AUTH_REPLY:
962 m = ceph_msg_get(monc->m_auth_reply);
963 break;
964 case CEPH_MSG_MON_MAP:
965 case CEPH_MSG_MDS_MAP:
966 case CEPH_MSG_OSD_MAP:
967 m = ceph_msg_new(type, front_len, GFP_NOFS);
968 break;
969 }
970
971 if (!m) {
972 pr_info("alloc_msg unknown type %d\n", type);
973 *skip = 1;
974 }
975 return m;
976}
977
978/*
979 * If the monitor connection resets, pick a new monitor and resubmit
980 * any pending requests.
981 */
982static void mon_fault(struct ceph_connection *con)
983{
984 struct ceph_mon_client *monc = con->private;
985
986 if (!monc)
987 return;
988
989 dout("mon_fault\n");
990 mutex_lock(&monc->mutex);
991 if (!con->private)
992 goto out;
993
994 if (monc->con && !monc->hunting)
995 pr_info("mon%d %s session lost, "
996 "hunting for new mon\n", monc->cur_mon,
997 pr_addr(&monc->con->peer_addr.in_addr));
998
999 __close_session(monc);
1000 if (!monc->hunting) {
1001 /* start hunting */
1002 monc->hunting = true;
1003 __open_session(monc);
1004 } else {
1005 /* already hunting, let's wait a bit */
1006 __schedule_delayed(monc);
1007 }
1008out:
1009 mutex_unlock(&monc->mutex);
1010}
1011
1012static const struct ceph_connection_operations mon_con_ops = {
1013 .get = ceph_con_get,
1014 .put = ceph_con_put,
1015 .dispatch = dispatch,
1016 .fault = mon_fault,
1017 .alloc_msg = mon_alloc_msg,
1018};
Linux 6.x block layer and io_uring tree(s)