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ba75bb98 SW |
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 | ||
29 | const static struct ceph_connection_operations mon_con_ops; | |
30 | ||
31 | /* | |
32 | * Decode a monmap blob (e.g., during mount). | |
33 | */ | |
34 | struct 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 | ||
73 | bad: | |
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 | */ | |
82 | int 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 | */ | |
95 | static 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 | */ | |
107 | static 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 | ||
131 | static 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 | */ | |
139 | static 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 | */ | |
154 | static 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 | ||
201 | static 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); | |
0656d11b | 216 | monc->sub_renew_after = monc->sub_sent + (seconds >> 1)*HZ - 1; |
ba75bb98 SW |
217 | monc->sub_sent = 0; |
218 | mutex_unlock(&monc->mutex); | |
219 | return; | |
220 | bad: | |
221 | pr_err("got corrupt subscribe-ack msg\n"); | |
222 | } | |
223 | ||
224 | /* | |
225 | * Keep track of which maps we have | |
226 | */ | |
227 | int 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 | ||
235 | int 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 | */ | |
247 | void 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 | */ | |
262 | static 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 | ||
280 | int 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 | */ | |
302 | static 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 | ||
365 | bad: | |
366 | pr_err("error decoding mount_ack message\n"); | |
367 | out: | |
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 | */ | |
379 | static 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 | ||
402 | bad: | |
403 | pr_err("corrupt statfs reply, no tid\n"); | |
404 | } | |
405 | ||
406 | /* | |
407 | * (re)send a statfs request | |
408 | */ | |
409 | static 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 | */ | |
435 | int 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 | */ | |
480 | static 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 | */ | |
505 | static 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 { | |
0656d11b | 515 | if (monc->hunting) { |
ba75bb98 SW |
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 | ||
527 | int 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; | |
565 | out: | |
566 | return err; | |
567 | } | |
568 | ||
569 | void 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 | */ | |
594 | static 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 | */ | |
633 | static 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 | */ | |
654 | static 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 | } | |
683 | out: | |
684 | mutex_unlock(&monc->mutex); | |
685 | } | |
686 | ||
687 | const 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 | }; |