aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--fs/ceph/mon_client.c694
-rw-r--r--fs/ceph/mon_client.h109
2 files changed, 803 insertions, 0 deletions
diff --git a/fs/ceph/mon_client.c b/fs/ceph/mon_client.c
new file mode 100644
index 000000000000..b0c95cec5df8
--- /dev/null
+++ b/fs/ceph/mon_client.c
@@ -0,0 +1,694 @@
1#include "ceph_debug.h"
2
3#include <linux/types.h>
4#include <linux/random.h>
5#include <linux/sched.h>
6
7#include "mon_client.h"
8#include "super.h"
9#include "decode.h"
10
11/*
12 * Interact with Ceph monitor cluster. Handle requests for new map
13 * versions, and periodically resend as needed. Also implement
14 * statfs() and umount().
15 *
16 * A small cluster of Ceph "monitors" are responsible for managing critical
17 * cluster configuration and state information. An odd number (e.g., 3, 5)
18 * of cmon daemons use a modified version of the Paxos part-time parliament
19 * algorithm to manage the MDS map (mds cluster membership), OSD map, and
20 * list of clients who have mounted the file system.
21 *
22 * We maintain an open, active session with a monitor at all times in order to
23 * receive timely MDSMap updates. We periodically send a keepalive byte on the
24 * TCP socket to ensure we detect a failure. If the connection does break, we
25 * randomly hunt for a new monitor. Once the connection is reestablished, we
26 * resend any outstanding requests.
27 */
28
29const static struct ceph_connection_operations mon_con_ops;
30
31/*
32 * Decode a monmap blob (e.g., during mount).
33 */
34struct ceph_monmap *ceph_monmap_decode(void *p, void *end)
35{
36 struct ceph_monmap *m = NULL;
37 int i, err = -EINVAL;
38 struct ceph_fsid fsid;
39 u32 epoch, num_mon;
40 u16 version;
41
42 dout("monmap_decode %p %p len %d\n", p, end, (int)(end-p));
43
44 ceph_decode_16_safe(&p, end, version, bad);
45
46 ceph_decode_need(&p, end, sizeof(fsid) + 2*sizeof(u32), bad);
47 ceph_decode_copy(&p, &fsid, sizeof(fsid));
48 ceph_decode_32(&p, epoch);
49
50 ceph_decode_32(&p, num_mon);
51 ceph_decode_need(&p, end, num_mon*sizeof(m->mon_inst[0]), bad);
52
53 if (num_mon >= CEPH_MAX_MON)
54 goto bad;
55 m = kmalloc(sizeof(*m) + sizeof(m->mon_inst[0])*num_mon, GFP_NOFS);
56 if (m == NULL)
57 return ERR_PTR(-ENOMEM);
58 m->fsid = fsid;
59 m->epoch = epoch;
60 m->num_mon = num_mon;
61 ceph_decode_copy(&p, m->mon_inst, num_mon*sizeof(m->mon_inst[0]));
62
63 if (p != end)
64 goto bad;
65
66 dout("monmap_decode epoch %d, num_mon %d\n", m->epoch,
67 m->num_mon);
68 for (i = 0; i < m->num_mon; i++)
69 dout("monmap_decode mon%d is %s\n", i,
70 pr_addr(&m->mon_inst[i].addr.in_addr));
71 return m;
72
73bad:
74 dout("monmap_decode failed with %d\n", err);
75 kfree(m);
76 return ERR_PTR(err);
77}
78
79/*
80 * return true if *addr is included in the monmap.
81 */
82int ceph_monmap_contains(struct ceph_monmap *m, struct ceph_entity_addr *addr)
83{
84 int i;
85
86 for (i = 0; i < m->num_mon; i++)
87 if (ceph_entity_addr_equal(addr, &m->mon_inst[i].addr))
88 return 1;
89 return 0;
90}
91
92/*
93 * Close monitor session, if any.
94 */
95static void __close_session(struct ceph_mon_client *monc)
96{
97 if (monc->con) {
98 dout("__close_session closing mon%d\n", monc->cur_mon);
99 ceph_con_close(monc->con);
100 monc->cur_mon = -1;
101 }
102}
103
104/*
105 * Open a session with a (new) monitor.
106 */
107static int __open_session(struct ceph_mon_client *monc)
108{
109 char r;
110
111 if (monc->cur_mon < 0) {
112 get_random_bytes(&r, 1);
113 monc->cur_mon = r % monc->monmap->num_mon;
114 dout("open_session num=%d r=%d -> mon%d\n",
115 monc->monmap->num_mon, r, monc->cur_mon);
116 monc->sub_sent = 0;
117 monc->sub_renew_after = jiffies; /* i.e., expired */
118 monc->want_next_osdmap = !!monc->want_next_osdmap;
119
120 dout("open_session mon%d opening\n", monc->cur_mon);
121 monc->con->peer_name.type = CEPH_ENTITY_TYPE_MON;
122 monc->con->peer_name.num = cpu_to_le64(monc->cur_mon);
123 ceph_con_open(monc->con,
124 &monc->monmap->mon_inst[monc->cur_mon].addr);
125 } else {
126 dout("open_session mon%d already open\n", monc->cur_mon);
127 }
128 return 0;
129}
130
131static bool __sub_expired(struct ceph_mon_client *monc)
132{
133 return time_after_eq(jiffies, monc->sub_renew_after);
134}
135
136/*
137 * Reschedule delayed work timer.
138 */
139static void __schedule_delayed(struct ceph_mon_client *monc)
140{
141 unsigned delay;
142
143 if (monc->cur_mon < 0 || monc->want_mount || __sub_expired(monc))
144 delay = 10 * HZ;
145 else
146 delay = 20 * HZ;
147 dout("__schedule_delayed after %u\n", delay);
148 schedule_delayed_work(&monc->delayed_work, delay);
149}
150
151/*
152 * Send subscribe request for mdsmap and/or osdmap.
153 */
154static void __send_subscribe(struct ceph_mon_client *monc)
155{
156 dout("__send_subscribe sub_sent=%u exp=%u want_osd=%d\n",
157 (unsigned)monc->sub_sent, __sub_expired(monc),
158 monc->want_next_osdmap);
159 if ((__sub_expired(monc) && !monc->sub_sent) ||
160 monc->want_next_osdmap == 1) {
161 struct ceph_msg *msg;
162 struct ceph_mon_subscribe_item *i;
163 void *p, *end;
164
165 msg = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 64, 0, 0, NULL);
166 if (!msg)
167 return;
168
169 p = msg->front.iov_base;
170 end = p + msg->front.iov_len;
171
172 dout("__send_subscribe to 'mdsmap' %u+\n",
173 (unsigned)monc->have_mdsmap);
174 if (monc->want_next_osdmap) {
175 dout("__send_subscribe to 'osdmap' %u\n",
176 (unsigned)monc->have_osdmap);
177 ceph_encode_32(&p, 2);
178 ceph_encode_string(&p, end, "osdmap", 6);
179 i = p;
180 i->have = cpu_to_le64(monc->have_osdmap);
181 i->onetime = 1;
182 p += sizeof(*i);
183 monc->want_next_osdmap = 2; /* requested */
184 } else {
185 ceph_encode_32(&p, 1);
186 }
187 ceph_encode_string(&p, end, "mdsmap", 6);
188 i = p;
189 i->have = cpu_to_le64(monc->have_mdsmap);
190 i->onetime = 0;
191 p += sizeof(*i);
192
193 msg->front.iov_len = p - msg->front.iov_base;
194 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
195 ceph_con_send(monc->con, msg);
196
197 monc->sub_sent = jiffies | 1; /* never 0 */
198 }
199}
200
201static void handle_subscribe_ack(struct ceph_mon_client *monc,
202 struct ceph_msg *msg)
203{
204 unsigned seconds;
205 void *p = msg->front.iov_base;
206 void *end = p + msg->front.iov_len;
207
208 ceph_decode_32_safe(&p, end, seconds, bad);
209 mutex_lock(&monc->mutex);
210 if (monc->hunting) {
211 pr_info("mon%d %s session established\n",
212 monc->cur_mon, pr_addr(&monc->con->peer_addr.in_addr));
213 monc->hunting = false;
214 }
215 dout("handle_subscribe_ack after %d seconds\n", seconds);
216 monc->sub_renew_after = monc->sub_sent + seconds*HZ - 1;
217 monc->sub_sent = 0;
218 mutex_unlock(&monc->mutex);
219 return;
220bad:
221 pr_err("got corrupt subscribe-ack msg\n");
222}
223
224/*
225 * Keep track of which maps we have
226 */
227int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 got)
228{
229 mutex_lock(&monc->mutex);
230 monc->have_mdsmap = got;
231 mutex_unlock(&monc->mutex);
232 return 0;
233}
234
235int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 got)
236{
237 mutex_lock(&monc->mutex);
238 monc->have_osdmap = got;
239 monc->want_next_osdmap = 0;
240 mutex_unlock(&monc->mutex);
241 return 0;
242}
243
244/*
245 * Register interest in the next osdmap
246 */
247void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc)
248{
249 dout("request_next_osdmap have %u\n", monc->have_osdmap);
250 mutex_lock(&monc->mutex);
251 if (!monc->want_next_osdmap)
252 monc->want_next_osdmap = 1;
253 if (monc->want_next_osdmap < 2)
254 __send_subscribe(monc);
255 mutex_unlock(&monc->mutex);
256}
257
258
259/*
260 * mount
261 */
262static void __request_mount(struct ceph_mon_client *monc)
263{
264 struct ceph_msg *msg;
265 struct ceph_client_mount *h;
266 int err;
267
268 dout("__request_mount\n");
269 err = __open_session(monc);
270 if (err)
271 return;
272 msg = ceph_msg_new(CEPH_MSG_CLIENT_MOUNT, sizeof(*h), 0, 0, NULL);
273 if (IS_ERR(msg))
274 return;
275 h = msg->front.iov_base;
276 h->have_version = 0;
277 ceph_con_send(monc->con, msg);
278}
279
280int ceph_monc_request_mount(struct ceph_mon_client *monc)
281{
282 if (!monc->con) {
283 monc->con = kmalloc(sizeof(*monc->con), GFP_KERNEL);
284 if (!monc->con)
285 return -ENOMEM;
286 ceph_con_init(monc->client->msgr, monc->con);
287 monc->con->private = monc;
288 monc->con->ops = &mon_con_ops;
289 }
290
291 mutex_lock(&monc->mutex);
292 __request_mount(monc);
293 __schedule_delayed(monc);
294 mutex_unlock(&monc->mutex);
295 return 0;
296}
297
298/*
299 * The monitor responds with mount ack indicate mount success. The
300 * included client ticket allows the client to talk to MDSs and OSDs.
301 */
302static void handle_mount_ack(struct ceph_mon_client *monc, struct ceph_msg *msg)
303{
304 struct ceph_client *client = monc->client;
305 struct ceph_monmap *monmap = NULL, *old = monc->monmap;
306 void *p, *end;
307 s32 result;
308 u32 len;
309 s64 cnum;
310 int err = -EINVAL;
311
312 if (client->whoami >= 0) {
313 dout("handle_mount_ack - already mounted\n");
314 return;
315 }
316
317 mutex_lock(&monc->mutex);
318
319 dout("handle_mount_ack\n");
320 p = msg->front.iov_base;
321 end = p + msg->front.iov_len;
322
323 ceph_decode_64_safe(&p, end, cnum, bad);
324 ceph_decode_32_safe(&p, end, result, bad);
325 ceph_decode_32_safe(&p, end, len, bad);
326 if (result) {
327 pr_err("mount denied: %.*s (%d)\n", len, (char *)p,
328 result);
329 err = result;
330 goto out;
331 }
332 p += len;
333
334 ceph_decode_32_safe(&p, end, len, bad);
335 ceph_decode_need(&p, end, len, bad);
336 monmap = ceph_monmap_decode(p, p + len);
337 if (IS_ERR(monmap)) {
338 pr_err("problem decoding monmap, %d\n",
339 (int)PTR_ERR(monmap));
340 err = -EINVAL;
341 goto out;
342 }
343 p += len;
344
345 client->monc.monmap = monmap;
346 kfree(old);
347
348 client->signed_ticket = NULL;
349 client->signed_ticket_len = 0;
350
351 monc->want_mount = false;
352
353 client->whoami = cnum;
354 client->msgr->inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
355 client->msgr->inst.name.num = cpu_to_le64(cnum);
356 pr_info("client%lld fsid " FSID_FORMAT "\n",
357 client->whoami, PR_FSID(&client->monc.monmap->fsid));
358
359 ceph_debugfs_client_init(client);
360 __send_subscribe(monc);
361
362 err = 0;
363 goto out;
364
365bad:
366 pr_err("error decoding mount_ack message\n");
367out:
368 client->mount_err = err;
369 mutex_unlock(&monc->mutex);
370 wake_up(&client->mount_wq);
371}
372
373
374
375
376/*
377 * statfs
378 */
379static void handle_statfs_reply(struct ceph_mon_client *monc,
380 struct ceph_msg *msg)
381{
382 struct ceph_mon_statfs_request *req;
383 struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
384 u64 tid;
385
386 if (msg->front.iov_len != sizeof(*reply))
387 goto bad;
388 tid = le64_to_cpu(reply->tid);
389 dout("handle_statfs_reply %p tid %llu\n", msg, tid);
390
391 mutex_lock(&monc->mutex);
392 req = radix_tree_lookup(&monc->statfs_request_tree, tid);
393 if (req) {
394 *req->buf = reply->st;
395 req->result = 0;
396 }
397 mutex_unlock(&monc->mutex);
398 if (req)
399 complete(&req->completion);
400 return;
401
402bad:
403 pr_err("corrupt statfs reply, no tid\n");
404}
405
406/*
407 * (re)send a statfs request
408 */
409static int send_statfs(struct ceph_mon_client *monc,
410 struct ceph_mon_statfs_request *req)
411{
412 struct ceph_msg *msg;
413 struct ceph_mon_statfs *h;
414 int err;
415
416 dout("send_statfs tid %llu\n", req->tid);
417 err = __open_session(monc);
418 if (err)
419 return err;
420 msg = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), 0, 0, NULL);
421 if (IS_ERR(msg))
422 return PTR_ERR(msg);
423 req->request = msg;
424 h = msg->front.iov_base;
425 h->have_version = 0;
426 h->fsid = monc->monmap->fsid;
427 h->tid = cpu_to_le64(req->tid);
428 ceph_con_send(monc->con, msg);
429 return 0;
430}
431
432/*
433 * Do a synchronous statfs().
434 */
435int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf)
436{
437 struct ceph_mon_statfs_request req;
438 int err;
439
440 req.buf = buf;
441 init_completion(&req.completion);
442
443 /* allocate memory for reply */
444 err = ceph_msgpool_resv(&monc->msgpool_statfs_reply, 1);
445 if (err)
446 return err;
447
448 /* register request */
449 mutex_lock(&monc->mutex);
450 req.tid = ++monc->last_tid;
451 req.last_attempt = jiffies;
452 req.delay = BASE_DELAY_INTERVAL;
453 if (radix_tree_insert(&monc->statfs_request_tree, req.tid, &req) < 0) {
454 mutex_unlock(&monc->mutex);
455 pr_err("ENOMEM in do_statfs\n");
456 return -ENOMEM;
457 }
458 monc->num_statfs_requests++;
459 mutex_unlock(&monc->mutex);
460
461 /* send request and wait */
462 err = send_statfs(monc, &req);
463 if (!err)
464 err = wait_for_completion_interruptible(&req.completion);
465
466 mutex_lock(&monc->mutex);
467 radix_tree_delete(&monc->statfs_request_tree, req.tid);
468 monc->num_statfs_requests--;
469 ceph_msgpool_resv(&monc->msgpool_statfs_reply, -1);
470 mutex_unlock(&monc->mutex);
471
472 if (!err)
473 err = req.result;
474 return err;
475}
476
477/*
478 * Resend pending statfs requests.
479 */
480static void __resend_statfs(struct ceph_mon_client *monc)
481{
482 u64 next_tid = 0;
483 int got;
484 int did = 0;
485 struct ceph_mon_statfs_request *req;
486
487 while (1) {
488 got = radix_tree_gang_lookup(&monc->statfs_request_tree,
489 (void **)&req,
490 next_tid, 1);
491 if (got == 0)
492 break;
493 did++;
494 next_tid = req->tid + 1;
495
496 send_statfs(monc, req);
497 }
498}
499
500/*
501 * Delayed work. If we haven't mounted yet, retry. Otherwise,
502 * renew/retry subscription as needed (in case it is timing out, or we
503 * got an ENOMEM). And keep the monitor connection alive.
504 */
505static void delayed_work(struct work_struct *work)
506{
507 struct ceph_mon_client *monc =
508 container_of(work, struct ceph_mon_client, delayed_work.work);
509
510 dout("monc delayed_work\n");
511 mutex_lock(&monc->mutex);
512 if (monc->want_mount) {
513 __request_mount(monc);
514 } else {
515 if (__sub_expired(monc)) {
516 __close_session(monc);
517 __open_session(monc); /* continue hunting */
518 } else {
519 ceph_con_keepalive(monc->con);
520 }
521 }
522 __send_subscribe(monc);
523 __schedule_delayed(monc);
524 mutex_unlock(&monc->mutex);
525}
526
527int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
528{
529 int err = 0;
530
531 dout("init\n");
532 memset(monc, 0, sizeof(*monc));
533 monc->client = cl;
534 monc->monmap = NULL;
535 mutex_init(&monc->mutex);
536
537 monc->con = NULL;
538
539 /* msg pools */
540 err = ceph_msgpool_init(&monc->msgpool_mount_ack, 4096, 1, false);
541 if (err < 0)
542 goto out;
543 err = ceph_msgpool_init(&monc->msgpool_subscribe_ack, 8, 1, false);
544 if (err < 0)
545 goto out;
546 err = ceph_msgpool_init(&monc->msgpool_statfs_reply,
547 sizeof(struct ceph_mon_statfs_reply), 0, false);
548 if (err < 0)
549 goto out;
550
551 monc->cur_mon = -1;
552 monc->hunting = false; /* not really */
553 monc->sub_renew_after = jiffies;
554 monc->sub_sent = 0;
555
556 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
557 INIT_RADIX_TREE(&monc->statfs_request_tree, GFP_NOFS);
558 monc->num_statfs_requests = 0;
559 monc->last_tid = 0;
560
561 monc->have_mdsmap = 0;
562 monc->have_osdmap = 0;
563 monc->want_next_osdmap = 1;
564 monc->want_mount = true;
565out:
566 return err;
567}
568
569void ceph_monc_stop(struct ceph_mon_client *monc)
570{
571 dout("stop\n");
572 cancel_delayed_work_sync(&monc->delayed_work);
573
574 mutex_lock(&monc->mutex);
575 __close_session(monc);
576 if (monc->con) {
577 monc->con->private = NULL;
578 monc->con->ops->put(monc->con);
579 monc->con = NULL;
580 }
581 mutex_unlock(&monc->mutex);
582
583 ceph_msgpool_destroy(&monc->msgpool_mount_ack);
584 ceph_msgpool_destroy(&monc->msgpool_subscribe_ack);
585 ceph_msgpool_destroy(&monc->msgpool_statfs_reply);
586
587 kfree(monc->monmap);
588}
589
590
591/*
592 * handle incoming message
593 */
594static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
595{
596 struct ceph_mon_client *monc = con->private;
597 int type = le16_to_cpu(msg->hdr.type);
598
599 if (!monc)
600 return;
601
602 switch (type) {
603 case CEPH_MSG_CLIENT_MOUNT_ACK:
604 handle_mount_ack(monc, msg);
605 break;
606
607 case CEPH_MSG_MON_SUBSCRIBE_ACK:
608 handle_subscribe_ack(monc, msg);
609 break;
610
611 case CEPH_MSG_STATFS_REPLY:
612 handle_statfs_reply(monc, msg);
613 break;
614
615 case CEPH_MSG_MDS_MAP:
616 ceph_mdsc_handle_map(&monc->client->mdsc, msg);
617 break;
618
619 case CEPH_MSG_OSD_MAP:
620 ceph_osdc_handle_map(&monc->client->osdc, msg);
621 break;
622
623 default:
624 pr_err("received unknown message type %d %s\n", type,
625 ceph_msg_type_name(type));
626 }
627 ceph_msg_put(msg);
628}
629
630/*
631 * Allocate memory for incoming message
632 */
633static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
634 struct ceph_msg_header *hdr)
635{
636 struct ceph_mon_client *monc = con->private;
637 int type = le16_to_cpu(hdr->type);
638
639 switch (type) {
640 case CEPH_MSG_CLIENT_MOUNT_ACK:
641 return ceph_msgpool_get(&monc->msgpool_mount_ack);
642 case CEPH_MSG_MON_SUBSCRIBE_ACK:
643 return ceph_msgpool_get(&monc->msgpool_subscribe_ack);
644 case CEPH_MSG_STATFS_REPLY:
645 return ceph_msgpool_get(&monc->msgpool_statfs_reply);
646 }
647 return ceph_alloc_msg(con, hdr);
648}
649
650/*
651 * If the monitor connection resets, pick a new monitor and resubmit
652 * any pending requests.
653 */
654static void mon_fault(struct ceph_connection *con)
655{
656 struct ceph_mon_client *monc = con->private;
657
658 if (!monc)
659 return;
660
661 dout("mon_fault\n");
662 mutex_lock(&monc->mutex);
663 if (!con->private)
664 goto out;
665
666 if (monc->con && !monc->hunting)
667 pr_info("mon%d %s session lost, "
668 "hunting for new mon\n", monc->cur_mon,
669 pr_addr(&monc->con->peer_addr.in_addr));
670
671 __close_session(monc);
672 if (!monc->hunting) {
673 /* start hunting */
674 monc->hunting = true;
675 if (__open_session(monc) == 0) {
676 __send_subscribe(monc);
677 __resend_statfs(monc);
678 }
679 } else {
680 /* already hunting, let's wait a bit */
681 __schedule_delayed(monc);
682 }
683out:
684 mutex_unlock(&monc->mutex);
685}
686
687const static struct ceph_connection_operations mon_con_ops = {
688 .get = ceph_con_get,
689 .put = ceph_con_put,
690 .dispatch = dispatch,
691 .fault = mon_fault,
692 .alloc_msg = mon_alloc_msg,
693 .alloc_middle = ceph_alloc_middle,
694};
diff --git a/fs/ceph/mon_client.h b/fs/ceph/mon_client.h
new file mode 100644
index 000000000000..5258c5693b03
--- /dev/null
+++ b/fs/ceph/mon_client.h
@@ -0,0 +1,109 @@
1#ifndef _FS_CEPH_MON_CLIENT_H
2#define _FS_CEPH_MON_CLIENT_H
3
4#include <linux/completion.h>
5#include <linux/radix-tree.h>
6
7#include "messenger.h"
8#include "msgpool.h"
9
10struct ceph_client;
11struct ceph_mount_args;
12
13/*
14 * The monitor map enumerates the set of all monitors.
15 */
16struct ceph_monmap {
17 struct ceph_fsid fsid;
18 u32 epoch;
19 u32 num_mon;
20 struct ceph_entity_inst mon_inst[0];
21};
22
23struct ceph_mon_client;
24struct ceph_mon_statfs_request;
25
26
27/*
28 * Generic mechanism for resending monitor requests.
29 */
30typedef void (*ceph_monc_request_func_t)(struct ceph_mon_client *monc,
31 int newmon);
32
33/* a pending monitor request */
34struct ceph_mon_request {
35 struct ceph_mon_client *monc;
36 struct delayed_work delayed_work;
37 unsigned long delay;
38 ceph_monc_request_func_t do_request;
39};
40
41/*
42 * statfs() is done a bit differently because we need to get data back
43 * to the caller
44 */
45struct ceph_mon_statfs_request {
46 u64 tid;
47 int result;
48 struct ceph_statfs *buf;
49 struct completion completion;
50 unsigned long last_attempt, delay; /* jiffies */
51 struct ceph_msg *request; /* original request */
52};
53
54struct ceph_mon_client {
55 struct ceph_client *client;
56 struct ceph_monmap *monmap;
57
58 struct mutex mutex;
59 struct delayed_work delayed_work;
60
61 bool hunting;
62 int cur_mon; /* last monitor i contacted */
63 unsigned long sub_sent, sub_renew_after;
64 struct ceph_connection *con;
65
66 /* msg pools */
67 struct ceph_msgpool msgpool_mount_ack;
68 struct ceph_msgpool msgpool_subscribe_ack;
69 struct ceph_msgpool msgpool_statfs_reply;
70
71 /* pending statfs requests */
72 struct radix_tree_root statfs_request_tree;
73 int num_statfs_requests;
74 u64 last_tid;
75
76 /* mds/osd map or mount requests */
77 bool want_mount;
78 int want_next_osdmap; /* 1 = want, 2 = want+asked */
79 u32 have_osdmap, have_mdsmap;
80
81 struct dentry *debugfs_file;
82};
83
84extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
85extern int ceph_monmap_contains(struct ceph_monmap *m,
86 struct ceph_entity_addr *addr);
87
88extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
89extern void ceph_monc_stop(struct ceph_mon_client *monc);
90
91/*
92 * The model here is to indicate that we need a new map of at least
93 * epoch @want, and also call in when we receive a map. We will
94 * periodically rerequest the map from the monitor cluster until we
95 * get what we want.
96 */
97extern int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 have);
98extern int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 have);
99
100extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
101
102extern int ceph_monc_request_mount(struct ceph_mon_client *monc);
103
104extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
105 struct ceph_statfs *buf);
106
107
108
109#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-13 19:12:05 -0500