1 #include <linux/ceph/ceph_debug.h>
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>
9 #include <linux/ceph/ceph_features.h>
10 #include <linux/ceph/mon_client.h>
11 #include <linux/ceph/libceph.h>
12 #include <linux/ceph/debugfs.h>
13 #include <linux/ceph/decode.h>
14 #include <linux/ceph/auth.h>
17 * Interact with Ceph monitor cluster. Handle requests for new map
18 * versions, and periodically resend as needed. Also implement
19 * statfs() and umount().
21 * A small cluster of Ceph "monitors" are responsible for managing critical
22 * cluster configuration and state information. An odd number (e.g., 3, 5)
23 * of cmon daemons use a modified version of the Paxos part-time parliament
24 * algorithm to manage the MDS map (mds cluster membership), OSD map, and
25 * list of clients who have mounted the file system.
27 * We maintain an open, active session with a monitor at all times in order to
28 * receive timely MDSMap updates. We periodically send a keepalive byte on the
29 * TCP socket to ensure we detect a failure. If the connection does break, we
30 * randomly hunt for a new monitor. Once the connection is reestablished, we
31 * resend any outstanding requests.
34 static const struct ceph_connection_operations mon_con_ops;
36 static int __validate_auth(struct ceph_mon_client *monc);
39 * Decode a monmap blob (e.g., during mount).
41 struct ceph_monmap *ceph_monmap_decode(void *p, void *end)
43 struct ceph_monmap *m = NULL;
45 struct ceph_fsid fsid;
49 ceph_decode_32_safe(&p, end, len, bad);
50 ceph_decode_need(&p, end, len, bad);
52 dout("monmap_decode %p %p len %d\n", p, end, (int)(end-p));
53 p += sizeof(u16); /* skip version */
55 ceph_decode_need(&p, end, sizeof(fsid) + 2*sizeof(u32), bad);
56 ceph_decode_copy(&p, &fsid, sizeof(fsid));
57 epoch = ceph_decode_32(&p);
59 num_mon = ceph_decode_32(&p);
60 ceph_decode_need(&p, end, num_mon*sizeof(m->mon_inst[0]), bad);
62 if (num_mon >= CEPH_MAX_MON)
64 m = kmalloc(sizeof(*m) + sizeof(m->mon_inst[0])*num_mon, GFP_NOFS);
66 return ERR_PTR(-ENOMEM);
70 ceph_decode_copy(&p, m->mon_inst, num_mon*sizeof(m->mon_inst[0]));
71 for (i = 0; i < num_mon; i++)
72 ceph_decode_addr(&m->mon_inst[i].addr);
74 dout("monmap_decode epoch %d, num_mon %d\n", m->epoch,
76 for (i = 0; i < m->num_mon; i++)
77 dout("monmap_decode mon%d is %s\n", i,
78 ceph_pr_addr(&m->mon_inst[i].addr.in_addr));
82 dout("monmap_decode failed with %d\n", err);
88 * return true if *addr is included in the monmap.
90 int ceph_monmap_contains(struct ceph_monmap *m, struct ceph_entity_addr *addr)
94 for (i = 0; i < m->num_mon; i++)
95 if (memcmp(addr, &m->mon_inst[i].addr, sizeof(*addr)) == 0)
101 * Send an auth request.
103 static void __send_prepared_auth_request(struct ceph_mon_client *monc, int len)
105 monc->pending_auth = 1;
106 monc->m_auth->front.iov_len = len;
107 monc->m_auth->hdr.front_len = cpu_to_le32(len);
108 ceph_msg_revoke(monc->m_auth);
109 ceph_msg_get(monc->m_auth); /* keep our ref */
110 ceph_con_send(&monc->con, monc->m_auth);
114 * Close monitor session, if any.
116 static void __close_session(struct ceph_mon_client *monc)
118 dout("__close_session closing mon%d\n", monc->cur_mon);
119 ceph_msg_revoke(monc->m_auth);
120 ceph_msg_revoke_incoming(monc->m_auth_reply);
121 ceph_msg_revoke(monc->m_subscribe);
122 ceph_msg_revoke_incoming(monc->m_subscribe_ack);
123 ceph_con_close(&monc->con);
125 monc->pending_auth = 0;
126 ceph_auth_reset(monc->auth);
130 * Pick a new monitor at random and set cur_mon. If we are repicking
131 * (i.e. cur_mon is already set), be sure to pick a different one.
133 static void pick_new_mon(struct ceph_mon_client *monc)
135 int old_mon = monc->cur_mon;
137 BUG_ON(monc->monmap->num_mon < 1);
139 if (monc->monmap->num_mon == 1) {
142 int max = monc->monmap->num_mon;
146 if (monc->cur_mon >= 0) {
147 if (monc->cur_mon < monc->monmap->num_mon)
153 n = prandom_u32() % max;
154 if (o >= 0 && n >= o)
160 dout("%s mon%d -> mon%d out of %d mons\n", __func__, old_mon,
161 monc->cur_mon, monc->monmap->num_mon);
165 * Open a session with a new monitor.
167 static void __open_session(struct ceph_mon_client *monc)
173 monc->hunting = true;
174 if (monc->had_a_connection) {
175 monc->hunt_mult *= CEPH_MONC_HUNT_BACKOFF;
176 if (monc->hunt_mult > CEPH_MONC_HUNT_MAX_MULT)
177 monc->hunt_mult = CEPH_MONC_HUNT_MAX_MULT;
180 monc->sub_renew_after = jiffies; /* i.e., expired */
181 monc->sub_renew_sent = 0;
183 dout("%s opening mon%d\n", __func__, monc->cur_mon);
184 ceph_con_open(&monc->con, CEPH_ENTITY_TYPE_MON, monc->cur_mon,
185 &monc->monmap->mon_inst[monc->cur_mon].addr);
188 * send an initial keepalive to ensure our timestamp is valid
189 * by the time we are in an OPENED state
191 ceph_con_keepalive(&monc->con);
193 /* initiate authentication handshake */
194 ret = ceph_auth_build_hello(monc->auth,
195 monc->m_auth->front.iov_base,
196 monc->m_auth->front_alloc_len);
198 __send_prepared_auth_request(monc, ret);
201 static void reopen_session(struct ceph_mon_client *monc)
204 pr_info("mon%d %s session lost, hunting for new mon\n",
205 monc->cur_mon, ceph_pr_addr(&monc->con.peer_addr.in_addr));
207 __close_session(monc);
208 __open_session(monc);
212 * Reschedule delayed work timer.
214 static void __schedule_delayed(struct ceph_mon_client *monc)
219 delay = CEPH_MONC_HUNT_INTERVAL * monc->hunt_mult;
221 delay = CEPH_MONC_PING_INTERVAL;
223 dout("__schedule_delayed after %lu\n", delay);
224 mod_delayed_work(system_wq, &monc->delayed_work,
225 round_jiffies_relative(delay));
228 const char *ceph_sub_str[] = {
229 [CEPH_SUB_MONMAP] = "monmap",
230 [CEPH_SUB_OSDMAP] = "osdmap",
231 [CEPH_SUB_FSMAP] = "fsmap.user",
232 [CEPH_SUB_MDSMAP] = "mdsmap",
236 * Send subscribe request for one or more maps, according to
239 static void __send_subscribe(struct ceph_mon_client *monc)
241 struct ceph_msg *msg = monc->m_subscribe;
242 void *p = msg->front.iov_base;
243 void *const end = p + msg->front_alloc_len;
247 dout("%s sent %lu\n", __func__, monc->sub_renew_sent);
249 BUG_ON(monc->cur_mon < 0);
251 if (!monc->sub_renew_sent)
252 monc->sub_renew_sent = jiffies | 1; /* never 0 */
254 msg->hdr.version = cpu_to_le16(2);
256 for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
257 if (monc->subs[i].want)
260 BUG_ON(num < 1); /* monmap sub is always there */
261 ceph_encode_32(&p, num);
262 for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
266 if (!monc->subs[i].want)
269 len = sprintf(buf, "%s", ceph_sub_str[i]);
270 if (i == CEPH_SUB_MDSMAP &&
271 monc->fs_cluster_id != CEPH_FS_CLUSTER_ID_NONE)
272 len += sprintf(buf + len, ".%d", monc->fs_cluster_id);
274 dout("%s %s start %llu flags 0x%x\n", __func__, buf,
275 le64_to_cpu(monc->subs[i].item.start),
276 monc->subs[i].item.flags);
277 ceph_encode_string(&p, end, buf, len);
278 memcpy(p, &monc->subs[i].item, sizeof(monc->subs[i].item));
279 p += sizeof(monc->subs[i].item);
283 msg->front.iov_len = p - msg->front.iov_base;
284 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
285 ceph_msg_revoke(msg);
286 ceph_con_send(&monc->con, ceph_msg_get(msg));
289 static void handle_subscribe_ack(struct ceph_mon_client *monc,
290 struct ceph_msg *msg)
292 unsigned int seconds;
293 struct ceph_mon_subscribe_ack *h = msg->front.iov_base;
295 if (msg->front.iov_len < sizeof(*h))
297 seconds = le32_to_cpu(h->duration);
299 mutex_lock(&monc->mutex);
300 if (monc->sub_renew_sent) {
302 * This is only needed for legacy (infernalis or older)
303 * MONs -- see delayed_work().
305 monc->sub_renew_after = monc->sub_renew_sent +
306 (seconds >> 1) * HZ - 1;
307 dout("%s sent %lu duration %d renew after %lu\n", __func__,
308 monc->sub_renew_sent, seconds, monc->sub_renew_after);
309 monc->sub_renew_sent = 0;
311 dout("%s sent %lu renew after %lu, ignoring\n", __func__,
312 monc->sub_renew_sent, monc->sub_renew_after);
314 mutex_unlock(&monc->mutex);
317 pr_err("got corrupt subscribe-ack msg\n");
322 * Register interest in a map
324 * @sub: one of CEPH_SUB_*
325 * @epoch: X for "every map since X", or 0 for "just the latest"
327 static bool __ceph_monc_want_map(struct ceph_mon_client *monc, int sub,
328 u32 epoch, bool continuous)
330 __le64 start = cpu_to_le64(epoch);
331 u8 flags = !continuous ? CEPH_SUBSCRIBE_ONETIME : 0;
333 dout("%s %s epoch %u continuous %d\n", __func__, ceph_sub_str[sub],
336 if (monc->subs[sub].want &&
337 monc->subs[sub].item.start == start &&
338 monc->subs[sub].item.flags == flags)
341 monc->subs[sub].item.start = start;
342 monc->subs[sub].item.flags = flags;
343 monc->subs[sub].want = true;
348 bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
353 mutex_lock(&monc->mutex);
354 need_request = __ceph_monc_want_map(monc, sub, epoch, continuous);
355 mutex_unlock(&monc->mutex);
359 EXPORT_SYMBOL(ceph_monc_want_map);
362 * Keep track of which maps we have
364 * @sub: one of CEPH_SUB_*
366 static void __ceph_monc_got_map(struct ceph_mon_client *monc, int sub,
369 dout("%s %s epoch %u\n", __func__, ceph_sub_str[sub], epoch);
371 if (monc->subs[sub].want) {
372 if (monc->subs[sub].item.flags & CEPH_SUBSCRIBE_ONETIME)
373 monc->subs[sub].want = false;
375 monc->subs[sub].item.start = cpu_to_le64(epoch + 1);
378 monc->subs[sub].have = epoch;
381 void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch)
383 mutex_lock(&monc->mutex);
384 __ceph_monc_got_map(monc, sub, epoch);
385 mutex_unlock(&monc->mutex);
387 EXPORT_SYMBOL(ceph_monc_got_map);
389 void ceph_monc_renew_subs(struct ceph_mon_client *monc)
391 mutex_lock(&monc->mutex);
392 __send_subscribe(monc);
393 mutex_unlock(&monc->mutex);
395 EXPORT_SYMBOL(ceph_monc_renew_subs);
398 * Wait for an osdmap with a given epoch.
400 * @epoch: epoch to wait for
401 * @timeout: in jiffies, 0 means "wait forever"
403 int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
404 unsigned long timeout)
406 unsigned long started = jiffies;
409 mutex_lock(&monc->mutex);
410 while (monc->subs[CEPH_SUB_OSDMAP].have < epoch) {
411 mutex_unlock(&monc->mutex);
413 if (timeout && time_after_eq(jiffies, started + timeout))
416 ret = wait_event_interruptible_timeout(monc->client->auth_wq,
417 monc->subs[CEPH_SUB_OSDMAP].have >= epoch,
418 ceph_timeout_jiffies(timeout));
422 mutex_lock(&monc->mutex);
425 mutex_unlock(&monc->mutex);
428 EXPORT_SYMBOL(ceph_monc_wait_osdmap);
431 * Open a session with a random monitor. Request monmap and osdmap,
432 * which are waited upon in __ceph_open_session().
434 int ceph_monc_open_session(struct ceph_mon_client *monc)
436 mutex_lock(&monc->mutex);
437 __ceph_monc_want_map(monc, CEPH_SUB_MONMAP, 0, true);
438 __ceph_monc_want_map(monc, CEPH_SUB_OSDMAP, 0, false);
439 __open_session(monc);
440 __schedule_delayed(monc);
441 mutex_unlock(&monc->mutex);
444 EXPORT_SYMBOL(ceph_monc_open_session);
446 static void ceph_monc_handle_map(struct ceph_mon_client *monc,
447 struct ceph_msg *msg)
449 struct ceph_client *client = monc->client;
450 struct ceph_monmap *monmap = NULL, *old = monc->monmap;
453 mutex_lock(&monc->mutex);
455 dout("handle_monmap\n");
456 p = msg->front.iov_base;
457 end = p + msg->front.iov_len;
459 monmap = ceph_monmap_decode(p, end);
460 if (IS_ERR(monmap)) {
461 pr_err("problem decoding monmap, %d\n",
462 (int)PTR_ERR(monmap));
466 if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) {
471 client->monc.monmap = monmap;
474 __ceph_monc_got_map(monc, CEPH_SUB_MONMAP, monc->monmap->epoch);
475 client->have_fsid = true;
478 mutex_unlock(&monc->mutex);
479 wake_up_all(&client->auth_wq);
483 * generic requests (currently statfs, mon_get_version)
485 DEFINE_RB_FUNCS(generic_request, struct ceph_mon_generic_request, tid, node)
487 static void release_generic_request(struct kref *kref)
489 struct ceph_mon_generic_request *req =
490 container_of(kref, struct ceph_mon_generic_request, kref);
492 dout("%s greq %p request %p reply %p\n", __func__, req, req->request,
494 WARN_ON(!RB_EMPTY_NODE(&req->node));
497 ceph_msg_put(req->reply);
499 ceph_msg_put(req->request);
504 static void put_generic_request(struct ceph_mon_generic_request *req)
507 kref_put(&req->kref, release_generic_request);
510 static void get_generic_request(struct ceph_mon_generic_request *req)
512 kref_get(&req->kref);
515 static struct ceph_mon_generic_request *
516 alloc_generic_request(struct ceph_mon_client *monc, gfp_t gfp)
518 struct ceph_mon_generic_request *req;
520 req = kzalloc(sizeof(*req), gfp);
525 kref_init(&req->kref);
526 RB_CLEAR_NODE(&req->node);
527 init_completion(&req->completion);
529 dout("%s greq %p\n", __func__, req);
533 static void register_generic_request(struct ceph_mon_generic_request *req)
535 struct ceph_mon_client *monc = req->monc;
539 get_generic_request(req);
540 req->tid = ++monc->last_tid;
541 insert_generic_request(&monc->generic_request_tree, req);
544 static void send_generic_request(struct ceph_mon_client *monc,
545 struct ceph_mon_generic_request *req)
549 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
550 req->request->hdr.tid = cpu_to_le64(req->tid);
551 ceph_con_send(&monc->con, ceph_msg_get(req->request));
554 static void __finish_generic_request(struct ceph_mon_generic_request *req)
556 struct ceph_mon_client *monc = req->monc;
558 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
559 erase_generic_request(&monc->generic_request_tree, req);
561 ceph_msg_revoke(req->request);
562 ceph_msg_revoke_incoming(req->reply);
565 static void finish_generic_request(struct ceph_mon_generic_request *req)
567 __finish_generic_request(req);
568 put_generic_request(req);
571 static void complete_generic_request(struct ceph_mon_generic_request *req)
573 if (req->complete_cb)
574 req->complete_cb(req);
576 complete_all(&req->completion);
577 put_generic_request(req);
580 static void cancel_generic_request(struct ceph_mon_generic_request *req)
582 struct ceph_mon_client *monc = req->monc;
583 struct ceph_mon_generic_request *lookup_req;
585 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
587 mutex_lock(&monc->mutex);
588 lookup_req = lookup_generic_request(&monc->generic_request_tree,
591 WARN_ON(lookup_req != req);
592 finish_generic_request(req);
595 mutex_unlock(&monc->mutex);
598 static int wait_generic_request(struct ceph_mon_generic_request *req)
602 dout("%s greq %p tid %llu\n", __func__, req, req->tid);
603 ret = wait_for_completion_interruptible(&req->completion);
605 cancel_generic_request(req);
607 ret = req->result; /* completed */
612 static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
613 struct ceph_msg_header *hdr,
616 struct ceph_mon_client *monc = con->private;
617 struct ceph_mon_generic_request *req;
618 u64 tid = le64_to_cpu(hdr->tid);
621 mutex_lock(&monc->mutex);
622 req = lookup_generic_request(&monc->generic_request_tree, tid);
624 dout("get_generic_reply %lld dne\n", tid);
628 dout("get_generic_reply %lld got %p\n", tid, req->reply);
630 m = ceph_msg_get(req->reply);
632 * we don't need to track the connection reading into
633 * this reply because we only have one open connection
637 mutex_unlock(&monc->mutex);
644 static void handle_statfs_reply(struct ceph_mon_client *monc,
645 struct ceph_msg *msg)
647 struct ceph_mon_generic_request *req;
648 struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
649 u64 tid = le64_to_cpu(msg->hdr.tid);
651 dout("%s msg %p tid %llu\n", __func__, msg, tid);
653 if (msg->front.iov_len != sizeof(*reply))
656 mutex_lock(&monc->mutex);
657 req = lookup_generic_request(&monc->generic_request_tree, tid);
659 mutex_unlock(&monc->mutex);
664 *req->u.st = reply->st; /* struct */
665 __finish_generic_request(req);
666 mutex_unlock(&monc->mutex);
668 complete_generic_request(req);
672 pr_err("corrupt statfs reply, tid %llu\n", tid);
677 * Do a synchronous statfs().
679 int ceph_monc_do_statfs(struct ceph_mon_client *monc, u64 data_pool,
680 struct ceph_statfs *buf)
682 struct ceph_mon_generic_request *req;
683 struct ceph_mon_statfs *h;
686 req = alloc_generic_request(monc, GFP_NOFS);
690 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS,
695 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 64, GFP_NOFS, true);
700 req->request->hdr.version = cpu_to_le16(2);
702 mutex_lock(&monc->mutex);
703 register_generic_request(req);
704 /* fill out request */
705 h = req->request->front.iov_base;
706 h->monhdr.have_version = 0;
707 h->monhdr.session_mon = cpu_to_le16(-1);
708 h->monhdr.session_mon_tid = 0;
709 h->fsid = monc->monmap->fsid;
710 h->contains_data_pool = (data_pool != CEPH_NOPOOL);
711 h->data_pool = cpu_to_le64(data_pool);
712 send_generic_request(monc, req);
713 mutex_unlock(&monc->mutex);
715 ret = wait_generic_request(req);
717 put_generic_request(req);
720 EXPORT_SYMBOL(ceph_monc_do_statfs);
722 static void handle_get_version_reply(struct ceph_mon_client *monc,
723 struct ceph_msg *msg)
725 struct ceph_mon_generic_request *req;
726 u64 tid = le64_to_cpu(msg->hdr.tid);
727 void *p = msg->front.iov_base;
728 void *end = p + msg->front_alloc_len;
731 dout("%s msg %p tid %llu\n", __func__, msg, tid);
733 ceph_decode_need(&p, end, 2*sizeof(u64), bad);
734 handle = ceph_decode_64(&p);
735 if (tid != 0 && tid != handle)
738 mutex_lock(&monc->mutex);
739 req = lookup_generic_request(&monc->generic_request_tree, handle);
741 mutex_unlock(&monc->mutex);
746 req->u.newest = ceph_decode_64(&p);
747 __finish_generic_request(req);
748 mutex_unlock(&monc->mutex);
750 complete_generic_request(req);
754 pr_err("corrupt mon_get_version reply, tid %llu\n", tid);
758 static struct ceph_mon_generic_request *
759 __ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
760 ceph_monc_callback_t cb, u64 private_data)
762 struct ceph_mon_generic_request *req;
764 req = alloc_generic_request(monc, GFP_NOIO);
768 req->request = ceph_msg_new(CEPH_MSG_MON_GET_VERSION,
769 sizeof(u64) + sizeof(u32) + strlen(what),
774 req->reply = ceph_msg_new(CEPH_MSG_MON_GET_VERSION_REPLY, 32, GFP_NOIO,
779 req->complete_cb = cb;
780 req->private_data = private_data;
782 mutex_lock(&monc->mutex);
783 register_generic_request(req);
785 void *p = req->request->front.iov_base;
786 void *const end = p + req->request->front_alloc_len;
788 ceph_encode_64(&p, req->tid); /* handle */
789 ceph_encode_string(&p, end, what, strlen(what));
792 send_generic_request(monc, req);
793 mutex_unlock(&monc->mutex);
798 put_generic_request(req);
799 return ERR_PTR(-ENOMEM);
803 * Send MMonGetVersion and wait for the reply.
805 * @what: one of "mdsmap", "osdmap" or "monmap"
807 int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
810 struct ceph_mon_generic_request *req;
813 req = __ceph_monc_get_version(monc, what, NULL, 0);
817 ret = wait_generic_request(req);
819 *newest = req->u.newest;
821 put_generic_request(req);
824 EXPORT_SYMBOL(ceph_monc_get_version);
827 * Send MMonGetVersion,
829 * @what: one of "mdsmap", "osdmap" or "monmap"
831 int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
832 ceph_monc_callback_t cb, u64 private_data)
834 struct ceph_mon_generic_request *req;
836 req = __ceph_monc_get_version(monc, what, cb, private_data);
840 put_generic_request(req);
843 EXPORT_SYMBOL(ceph_monc_get_version_async);
845 static void handle_command_ack(struct ceph_mon_client *monc,
846 struct ceph_msg *msg)
848 struct ceph_mon_generic_request *req;
849 void *p = msg->front.iov_base;
850 void *const end = p + msg->front_alloc_len;
851 u64 tid = le64_to_cpu(msg->hdr.tid);
853 dout("%s msg %p tid %llu\n", __func__, msg, tid);
855 ceph_decode_need(&p, end, sizeof(struct ceph_mon_request_header) +
857 p += sizeof(struct ceph_mon_request_header);
859 mutex_lock(&monc->mutex);
860 req = lookup_generic_request(&monc->generic_request_tree, tid);
862 mutex_unlock(&monc->mutex);
866 req->result = ceph_decode_32(&p);
867 __finish_generic_request(req);
868 mutex_unlock(&monc->mutex);
870 complete_generic_request(req);
874 pr_err("corrupt mon_command ack, tid %llu\n", tid);
878 int ceph_monc_blacklist_add(struct ceph_mon_client *monc,
879 struct ceph_entity_addr *client_addr)
881 struct ceph_mon_generic_request *req;
882 struct ceph_mon_command *h;
886 req = alloc_generic_request(monc, GFP_NOIO);
890 req->request = ceph_msg_new(CEPH_MSG_MON_COMMAND, 256, GFP_NOIO, true);
894 req->reply = ceph_msg_new(CEPH_MSG_MON_COMMAND_ACK, 512, GFP_NOIO,
899 mutex_lock(&monc->mutex);
900 register_generic_request(req);
901 h = req->request->front.iov_base;
902 h->monhdr.have_version = 0;
903 h->monhdr.session_mon = cpu_to_le16(-1);
904 h->monhdr.session_mon_tid = 0;
905 h->fsid = monc->monmap->fsid;
906 h->num_strs = cpu_to_le32(1);
907 len = sprintf(h->str, "{ \"prefix\": \"osd blacklist\", \
908 \"blacklistop\": \"add\", \
909 \"addr\": \"%pISpc/%u\" }",
910 &client_addr->in_addr, le32_to_cpu(client_addr->nonce));
911 h->str_len = cpu_to_le32(len);
912 send_generic_request(monc, req);
913 mutex_unlock(&monc->mutex);
915 ret = wait_generic_request(req);
917 put_generic_request(req);
920 EXPORT_SYMBOL(ceph_monc_blacklist_add);
923 * Resend pending generic requests.
925 static void __resend_generic_request(struct ceph_mon_client *monc)
927 struct ceph_mon_generic_request *req;
930 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
931 req = rb_entry(p, struct ceph_mon_generic_request, node);
932 ceph_msg_revoke(req->request);
933 ceph_msg_revoke_incoming(req->reply);
934 ceph_con_send(&monc->con, ceph_msg_get(req->request));
939 * Delayed work. If we haven't mounted yet, retry. Otherwise,
940 * renew/retry subscription as needed (in case it is timing out, or we
941 * got an ENOMEM). And keep the monitor connection alive.
943 static void delayed_work(struct work_struct *work)
945 struct ceph_mon_client *monc =
946 container_of(work, struct ceph_mon_client, delayed_work.work);
948 dout("monc delayed_work\n");
949 mutex_lock(&monc->mutex);
951 dout("%s continuing hunt\n", __func__);
952 reopen_session(monc);
954 int is_auth = ceph_auth_is_authenticated(monc->auth);
955 if (ceph_con_keepalive_expired(&monc->con,
956 CEPH_MONC_PING_TIMEOUT)) {
957 dout("monc keepalive timeout\n");
959 reopen_session(monc);
962 if (!monc->hunting) {
963 ceph_con_keepalive(&monc->con);
964 __validate_auth(monc);
968 !(monc->con.peer_features & CEPH_FEATURE_MON_STATEFUL_SUB)) {
969 unsigned long now = jiffies;
971 dout("%s renew subs? now %lu renew after %lu\n",
972 __func__, now, monc->sub_renew_after);
973 if (time_after_eq(now, monc->sub_renew_after))
974 __send_subscribe(monc);
977 __schedule_delayed(monc);
978 mutex_unlock(&monc->mutex);
982 * On startup, we build a temporary monmap populated with the IPs
983 * provided by mount(2).
985 static int build_initial_monmap(struct ceph_mon_client *monc)
987 struct ceph_options *opt = monc->client->options;
988 struct ceph_entity_addr *mon_addr = opt->mon_addr;
989 int num_mon = opt->num_mon;
992 /* build initial monmap */
993 monc->monmap = kzalloc(sizeof(*monc->monmap) +
994 num_mon*sizeof(monc->monmap->mon_inst[0]),
998 for (i = 0; i < num_mon; i++) {
999 monc->monmap->mon_inst[i].addr = mon_addr[i];
1000 monc->monmap->mon_inst[i].addr.nonce = 0;
1001 monc->monmap->mon_inst[i].name.type =
1002 CEPH_ENTITY_TYPE_MON;
1003 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
1005 monc->monmap->num_mon = num_mon;
1009 int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
1014 memset(monc, 0, sizeof(*monc));
1016 monc->monmap = NULL;
1017 mutex_init(&monc->mutex);
1019 err = build_initial_monmap(monc);
1024 /* authentication */
1025 monc->auth = ceph_auth_init(cl->options->name,
1027 if (IS_ERR(monc->auth)) {
1028 err = PTR_ERR(monc->auth);
1031 monc->auth->want_keys =
1032 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
1033 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
1037 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
1038 sizeof(struct ceph_mon_subscribe_ack),
1040 if (!monc->m_subscribe_ack)
1043 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 128,
1045 if (!monc->m_subscribe)
1046 goto out_subscribe_ack;
1048 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096,
1050 if (!monc->m_auth_reply)
1053 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_KERNEL, true);
1054 monc->pending_auth = 0;
1056 goto out_auth_reply;
1058 ceph_con_init(&monc->con, monc, &mon_con_ops,
1059 &monc->client->msgr);
1062 monc->had_a_connection = false;
1063 monc->hunt_mult = 1;
1065 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
1066 monc->generic_request_tree = RB_ROOT;
1069 monc->fs_cluster_id = CEPH_FS_CLUSTER_ID_NONE;
1074 ceph_msg_put(monc->m_auth_reply);
1076 ceph_msg_put(monc->m_subscribe);
1078 ceph_msg_put(monc->m_subscribe_ack);
1080 ceph_auth_destroy(monc->auth);
1082 kfree(monc->monmap);
1086 EXPORT_SYMBOL(ceph_monc_init);
1088 void ceph_monc_stop(struct ceph_mon_client *monc)
1091 cancel_delayed_work_sync(&monc->delayed_work);
1093 mutex_lock(&monc->mutex);
1094 __close_session(monc);
1096 mutex_unlock(&monc->mutex);
1099 * flush msgr queue before we destroy ourselves to ensure that:
1100 * - any work that references our embedded con is finished.
1101 * - any osd_client or other work that may reference an authorizer
1102 * finishes before we shut down the auth subsystem.
1106 ceph_auth_destroy(monc->auth);
1108 WARN_ON(!RB_EMPTY_ROOT(&monc->generic_request_tree));
1110 ceph_msg_put(monc->m_auth);
1111 ceph_msg_put(monc->m_auth_reply);
1112 ceph_msg_put(monc->m_subscribe);
1113 ceph_msg_put(monc->m_subscribe_ack);
1115 kfree(monc->monmap);
1117 EXPORT_SYMBOL(ceph_monc_stop);
1119 static void finish_hunting(struct ceph_mon_client *monc)
1121 if (monc->hunting) {
1122 dout("%s found mon%d\n", __func__, monc->cur_mon);
1123 monc->hunting = false;
1124 monc->had_a_connection = true;
1125 monc->hunt_mult /= 2; /* reduce by 50% */
1126 if (monc->hunt_mult < 1)
1127 monc->hunt_mult = 1;
1131 static void handle_auth_reply(struct ceph_mon_client *monc,
1132 struct ceph_msg *msg)
1137 mutex_lock(&monc->mutex);
1138 was_auth = ceph_auth_is_authenticated(monc->auth);
1139 monc->pending_auth = 0;
1140 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
1142 monc->m_auth->front.iov_base,
1143 monc->m_auth->front_alloc_len);
1145 __send_prepared_auth_request(monc, ret);
1149 finish_hunting(monc);
1152 monc->client->auth_err = ret;
1153 } else if (!was_auth && ceph_auth_is_authenticated(monc->auth)) {
1154 dout("authenticated, starting session\n");
1156 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
1157 monc->client->msgr.inst.name.num =
1158 cpu_to_le64(monc->auth->global_id);
1160 __send_subscribe(monc);
1161 __resend_generic_request(monc);
1163 pr_info("mon%d %s session established\n", monc->cur_mon,
1164 ceph_pr_addr(&monc->con.peer_addr.in_addr));
1168 mutex_unlock(&monc->mutex);
1169 if (monc->client->auth_err < 0)
1170 wake_up_all(&monc->client->auth_wq);
1173 static int __validate_auth(struct ceph_mon_client *monc)
1177 if (monc->pending_auth)
1180 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
1181 monc->m_auth->front_alloc_len);
1183 return ret; /* either an error, or no need to authenticate */
1184 __send_prepared_auth_request(monc, ret);
1188 int ceph_monc_validate_auth(struct ceph_mon_client *monc)
1192 mutex_lock(&monc->mutex);
1193 ret = __validate_auth(monc);
1194 mutex_unlock(&monc->mutex);
1197 EXPORT_SYMBOL(ceph_monc_validate_auth);
1200 * handle incoming message
1202 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1204 struct ceph_mon_client *monc = con->private;
1205 int type = le16_to_cpu(msg->hdr.type);
1211 case CEPH_MSG_AUTH_REPLY:
1212 handle_auth_reply(monc, msg);
1215 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1216 handle_subscribe_ack(monc, msg);
1219 case CEPH_MSG_STATFS_REPLY:
1220 handle_statfs_reply(monc, msg);
1223 case CEPH_MSG_MON_GET_VERSION_REPLY:
1224 handle_get_version_reply(monc, msg);
1227 case CEPH_MSG_MON_COMMAND_ACK:
1228 handle_command_ack(monc, msg);
1231 case CEPH_MSG_MON_MAP:
1232 ceph_monc_handle_map(monc, msg);
1235 case CEPH_MSG_OSD_MAP:
1236 ceph_osdc_handle_map(&monc->client->osdc, msg);
1240 /* can the chained handler handle it? */
1241 if (monc->client->extra_mon_dispatch &&
1242 monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1245 pr_err("received unknown message type %d %s\n", type,
1246 ceph_msg_type_name(type));
1252 * Allocate memory for incoming message
1254 static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1255 struct ceph_msg_header *hdr,
1258 struct ceph_mon_client *monc = con->private;
1259 int type = le16_to_cpu(hdr->type);
1260 int front_len = le32_to_cpu(hdr->front_len);
1261 struct ceph_msg *m = NULL;
1266 case CEPH_MSG_MON_SUBSCRIBE_ACK:
1267 m = ceph_msg_get(monc->m_subscribe_ack);
1269 case CEPH_MSG_STATFS_REPLY:
1270 case CEPH_MSG_MON_COMMAND_ACK:
1271 return get_generic_reply(con, hdr, skip);
1272 case CEPH_MSG_AUTH_REPLY:
1273 m = ceph_msg_get(monc->m_auth_reply);
1275 case CEPH_MSG_MON_GET_VERSION_REPLY:
1276 if (le64_to_cpu(hdr->tid) != 0)
1277 return get_generic_reply(con, hdr, skip);
1280 * Older OSDs don't set reply tid even if the orignal
1281 * request had a non-zero tid. Workaround this weirdness
1282 * by falling through to the allocate case.
1284 case CEPH_MSG_MON_MAP:
1285 case CEPH_MSG_MDS_MAP:
1286 case CEPH_MSG_OSD_MAP:
1287 case CEPH_MSG_FS_MAP_USER:
1288 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1290 return NULL; /* ENOMEM--return skip == 0 */
1295 pr_info("alloc_msg unknown type %d\n", type);
1297 } else if (front_len > m->front_alloc_len) {
1298 pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
1299 front_len, m->front_alloc_len,
1300 (unsigned int)con->peer_name.type,
1301 le64_to_cpu(con->peer_name.num));
1303 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1310 * If the monitor connection resets, pick a new monitor and resubmit
1311 * any pending requests.
1313 static void mon_fault(struct ceph_connection *con)
1315 struct ceph_mon_client *monc = con->private;
1317 mutex_lock(&monc->mutex);
1318 dout("%s mon%d\n", __func__, monc->cur_mon);
1319 if (monc->cur_mon >= 0) {
1320 if (!monc->hunting) {
1321 dout("%s hunting for new mon\n", __func__);
1322 reopen_session(monc);
1323 __schedule_delayed(monc);
1325 dout("%s already hunting\n", __func__);
1328 mutex_unlock(&monc->mutex);
1332 * We can ignore refcounting on the connection struct, as all references
1333 * will come from the messenger workqueue, which is drained prior to
1334 * mon_client destruction.
1336 static struct ceph_connection *con_get(struct ceph_connection *con)
1341 static void con_put(struct ceph_connection *con)
1345 static const struct ceph_connection_operations mon_con_ops = {
1348 .dispatch = dispatch,
1350 .alloc_msg = mon_alloc_msg,