4 Copyright (C) Andrew Tridgell 2006
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, see <http://www.gnu.org/licenses/>.
21 #include "system/network.h"
22 #include "system/filesys.h"
23 #include "system/wait.h"
24 #include "system/time.h"
27 /* Allow use of deprecated function tevent_loop_allow_nesting() */
28 #define TEVENT_DEPRECATED
32 #include "lib/tdb_wrap/tdb_wrap.h"
33 #include "lib/util/dlinklist.h"
34 #include "lib/util/debug.h"
35 #include "lib/util/time.h"
36 #include "lib/util/blocking.h"
37 #include "lib/util/become_daemon.h"
39 #include "common/version.h"
40 #include "ctdb_private.h"
41 #include "ctdb_client.h"
43 #include "common/rb_tree.h"
44 #include "common/reqid.h"
45 #include "common/system.h"
46 #include "common/common.h"
47 #include "common/logging.h"
48 #include "common/pidfile.h"
49 #include "common/sock_io.h"
51 struct ctdb_client_pid_list {
52 struct ctdb_client_pid_list *next, *prev;
53 struct ctdb_context *ctdb;
55 struct ctdb_client *client;
58 const char *ctdbd_pidfile = NULL;
59 static struct pidfile_context *ctdbd_pidfile_ctx = NULL;
61 static void daemon_incoming_packet(void *, struct ctdb_req_header *);
63 static pid_t __ctdbd_pid;
65 static void print_exit_message(void)
67 if (getpid() == __ctdbd_pid) {
68 DEBUG(DEBUG_NOTICE,("CTDB daemon shutting down\n"));
70 /* Wait a second to allow pending log messages to be flushed */
77 static void ctdb_time_tick(struct tevent_context *ev, struct tevent_timer *te,
78 struct timeval t, void *private_data)
80 struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
82 if (getpid() != ctdb->ctdbd_pid) {
86 tevent_add_timer(ctdb->ev, ctdb,
87 timeval_current_ofs(1, 0),
88 ctdb_time_tick, ctdb);
91 /* Used to trigger a dummy event once per second, to make
92 * detection of hangs more reliable.
94 static void ctdb_start_time_tickd(struct ctdb_context *ctdb)
96 tevent_add_timer(ctdb->ev, ctdb,
97 timeval_current_ofs(1, 0),
98 ctdb_time_tick, ctdb);
101 static void ctdb_start_periodic_events(struct ctdb_context *ctdb)
103 /* start monitoring for connected/disconnected nodes */
104 ctdb_start_keepalive(ctdb);
106 /* start periodic update of tcp tickle lists */
107 ctdb_start_tcp_tickle_update(ctdb);
109 /* start listening for recovery daemon pings */
110 ctdb_control_recd_ping(ctdb);
112 /* start listening to timer ticks */
113 ctdb_start_time_tickd(ctdb);
116 static void ignore_signal(int signum)
118 struct sigaction act;
120 memset(&act, 0, sizeof(act));
122 act.sa_handler = SIG_IGN;
123 sigemptyset(&act.sa_mask);
124 sigaddset(&act.sa_mask, signum);
125 sigaction(signum, &act, NULL);
130 send a packet to a client
132 static int daemon_queue_send(struct ctdb_client *client, struct ctdb_req_header *hdr)
134 CTDB_INCREMENT_STAT(client->ctdb, client_packets_sent);
135 if (hdr->operation == CTDB_REQ_MESSAGE) {
136 if (ctdb_queue_length(client->queue) > client->ctdb->tunable.max_queue_depth_drop_msg) {
137 DEBUG(DEBUG_ERR,("CTDB_REQ_MESSAGE queue full - killing client connection.\n"));
142 return ctdb_queue_send(client->queue, (uint8_t *)hdr, hdr->length);
146 message handler for when we are in daemon mode. This redirects the message
149 static void daemon_message_handler(uint64_t srvid, TDB_DATA data,
152 struct ctdb_client *client = talloc_get_type(private_data, struct ctdb_client);
153 struct ctdb_req_message_old *r;
156 /* construct a message to send to the client containing the data */
157 len = offsetof(struct ctdb_req_message_old, data) + data.dsize;
158 r = ctdbd_allocate_pkt(client->ctdb, client->ctdb, CTDB_REQ_MESSAGE,
159 len, struct ctdb_req_message_old);
160 CTDB_NO_MEMORY_VOID(client->ctdb, r);
162 talloc_set_name_const(r, "req_message packet");
165 r->datalen = data.dsize;
166 memcpy(&r->data[0], data.dptr, data.dsize);
168 daemon_queue_send(client, &r->hdr);
174 this is called when the ctdb daemon received a ctdb request to
175 set the srvid from the client
177 int daemon_register_message_handler(struct ctdb_context *ctdb, uint32_t client_id, uint64_t srvid)
179 struct ctdb_client *client = reqid_find(ctdb->idr, client_id, struct ctdb_client);
181 if (client == NULL) {
182 DEBUG(DEBUG_ERR,("Bad client_id in daemon_request_register_message_handler\n"));
185 res = srvid_register(ctdb->srv, client, srvid, daemon_message_handler,
188 DEBUG(DEBUG_ERR,(__location__ " Failed to register handler %llu in daemon\n",
189 (unsigned long long)srvid));
191 DEBUG(DEBUG_INFO,(__location__ " Registered message handler for srvid=%llu\n",
192 (unsigned long long)srvid));
199 this is called when the ctdb daemon received a ctdb request to
200 remove a srvid from the client
202 int daemon_deregister_message_handler(struct ctdb_context *ctdb, uint32_t client_id, uint64_t srvid)
204 struct ctdb_client *client = reqid_find(ctdb->idr, client_id, struct ctdb_client);
205 if (client == NULL) {
206 DEBUG(DEBUG_ERR,("Bad client_id in daemon_request_deregister_message_handler\n"));
209 return srvid_deregister(ctdb->srv, srvid, client);
212 void daemon_tunnel_handler(uint64_t tunnel_id, TDB_DATA data,
215 struct ctdb_client *client =
216 talloc_get_type_abort(private_data, struct ctdb_client);
217 struct ctdb_req_tunnel_old *c, *pkt;
220 pkt = (struct ctdb_req_tunnel_old *)data.dptr;
222 len = offsetof(struct ctdb_req_tunnel_old, data) + pkt->datalen;
223 c = ctdbd_allocate_pkt(client->ctdb, client->ctdb, CTDB_REQ_TUNNEL,
224 len, struct ctdb_req_tunnel_old);
226 DEBUG(DEBUG_ERR, ("Memory error in daemon_tunnel_handler\n"));
230 talloc_set_name_const(c, "req_tunnel packet");
232 c->tunnel_id = tunnel_id;
233 c->flags = pkt->flags;
234 c->datalen = pkt->datalen;
235 memcpy(c->data, pkt->data, pkt->datalen);
237 daemon_queue_send(client, &c->hdr);
243 destroy a ctdb_client
245 static int ctdb_client_destructor(struct ctdb_client *client)
247 struct ctdb_db_context *ctdb_db;
249 ctdb_takeover_client_destructor_hook(client);
250 reqid_remove(client->ctdb->idr, client->client_id);
251 client->ctdb->num_clients--;
253 if (client->num_persistent_updates != 0) {
254 DEBUG(DEBUG_ERR,(__location__ " Client disconnecting with %u persistent updates in flight. Starting recovery\n", client->num_persistent_updates));
255 client->ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE;
257 ctdb_db = find_ctdb_db(client->ctdb, client->db_id);
259 DEBUG(DEBUG_ERR, (__location__ " client exit while transaction "
260 "commit active. Forcing recovery.\n"));
261 client->ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE;
264 * trans3 transaction state:
266 * The destructor sets the pointer to NULL.
268 talloc_free(ctdb_db->persistent_state);
276 this is called when the ctdb daemon received a ctdb request message
277 from a local client over the unix domain socket
279 static void daemon_request_message_from_client(struct ctdb_client *client,
280 struct ctdb_req_message_old *c)
285 if (c->hdr.destnode == CTDB_CURRENT_NODE) {
286 c->hdr.destnode = ctdb_get_pnn(client->ctdb);
289 /* maybe the message is for another client on this node */
290 if (ctdb_get_pnn(client->ctdb)==c->hdr.destnode) {
291 ctdb_request_message(client->ctdb, (struct ctdb_req_header *)c);
295 /* its for a remote node */
296 data.dptr = &c->data[0];
297 data.dsize = c->datalen;
298 res = ctdb_daemon_send_message(client->ctdb, c->hdr.destnode,
301 DEBUG(DEBUG_ERR,(__location__ " Failed to send message to remote node %u\n",
307 struct daemon_call_state {
308 struct ctdb_client *client;
310 struct ctdb_call *call;
311 struct timeval start_time;
313 /* readonly request ? */
314 uint32_t readonly_fetch;
315 uint32_t client_callid;
319 complete a call from a client
321 static void daemon_call_from_client_callback(struct ctdb_call_state *state)
323 struct daemon_call_state *dstate = talloc_get_type(state->async.private_data,
324 struct daemon_call_state);
325 struct ctdb_reply_call_old *r;
328 struct ctdb_client *client = dstate->client;
329 struct ctdb_db_context *ctdb_db = state->ctdb_db;
331 talloc_steal(client, dstate);
332 talloc_steal(dstate, dstate->call);
334 res = ctdb_daemon_call_recv(state, dstate->call);
336 DEBUG(DEBUG_ERR, (__location__ " ctdbd_call_recv() returned error\n"));
337 CTDB_DECREMENT_STAT(client->ctdb, pending_calls);
339 CTDB_UPDATE_LATENCY(client->ctdb, ctdb_db, "call_from_client_cb 1", call_latency, dstate->start_time);
343 length = offsetof(struct ctdb_reply_call_old, data) + dstate->call->reply_data.dsize;
344 /* If the client asked for readonly FETCH, we remapped this to
345 FETCH_WITH_HEADER when calling the daemon. So we must
346 strip the extra header off the reply data before passing
347 it back to the client.
349 if (dstate->readonly_fetch
350 && dstate->client_callid == CTDB_FETCH_FUNC) {
351 length -= sizeof(struct ctdb_ltdb_header);
354 r = ctdbd_allocate_pkt(client->ctdb, dstate, CTDB_REPLY_CALL,
355 length, struct ctdb_reply_call_old);
357 DEBUG(DEBUG_ERR, (__location__ " Failed to allocate reply_call in ctdb daemon\n"));
358 CTDB_DECREMENT_STAT(client->ctdb, pending_calls);
359 CTDB_UPDATE_LATENCY(client->ctdb, ctdb_db, "call_from_client_cb 2", call_latency, dstate->start_time);
362 r->hdr.reqid = dstate->reqid;
363 r->status = dstate->call->status;
365 if (dstate->readonly_fetch
366 && dstate->client_callid == CTDB_FETCH_FUNC) {
367 /* client only asked for a FETCH so we must strip off
368 the extra ctdb_ltdb header
370 r->datalen = dstate->call->reply_data.dsize - sizeof(struct ctdb_ltdb_header);
371 memcpy(&r->data[0], dstate->call->reply_data.dptr + sizeof(struct ctdb_ltdb_header), r->datalen);
373 r->datalen = dstate->call->reply_data.dsize;
374 memcpy(&r->data[0], dstate->call->reply_data.dptr, r->datalen);
377 res = daemon_queue_send(client, &r->hdr);
379 /* client is dead - return immediately */
383 DEBUG(DEBUG_ERR, (__location__ " Failed to queue packet from daemon to client\n"));
385 CTDB_UPDATE_LATENCY(client->ctdb, ctdb_db, "call_from_client_cb 3", call_latency, dstate->start_time);
386 CTDB_DECREMENT_STAT(client->ctdb, pending_calls);
390 struct ctdb_daemon_packet_wrap {
391 struct ctdb_context *ctdb;
396 a wrapper to catch disconnected clients
398 static void daemon_incoming_packet_wrap(void *p, struct ctdb_req_header *hdr)
400 struct ctdb_client *client;
401 struct ctdb_daemon_packet_wrap *w = talloc_get_type(p,
402 struct ctdb_daemon_packet_wrap);
404 DEBUG(DEBUG_CRIT,(__location__ " Bad packet type '%s'\n", talloc_get_name(p)));
408 client = reqid_find(w->ctdb->idr, w->client_id, struct ctdb_client);
409 if (client == NULL) {
410 DEBUG(DEBUG_ERR,(__location__ " Packet for disconnected client %u\n",
418 daemon_incoming_packet(client, hdr);
421 struct ctdb_deferred_fetch_call {
422 struct ctdb_deferred_fetch_call *next, *prev;
423 struct ctdb_req_call_old *c;
424 struct ctdb_daemon_packet_wrap *w;
427 struct ctdb_deferred_fetch_queue {
428 struct ctdb_deferred_fetch_call *deferred_calls;
431 struct ctdb_deferred_requeue {
432 struct ctdb_deferred_fetch_call *dfc;
433 struct ctdb_client *client;
436 /* called from a timer event and starts reprocessing the deferred call.*/
437 static void reprocess_deferred_call(struct tevent_context *ev,
438 struct tevent_timer *te,
439 struct timeval t, void *private_data)
441 struct ctdb_deferred_requeue *dfr = (struct ctdb_deferred_requeue *)private_data;
442 struct ctdb_client *client = dfr->client;
444 talloc_steal(client, dfr->dfc->c);
445 daemon_incoming_packet(client, (struct ctdb_req_header *)dfr->dfc->c);
449 /* the referral context is destroyed either after a timeout or when the initial
450 fetch-lock has finished.
451 at this stage, immediately start reprocessing the queued up deferred
452 calls so they get reprocessed immediately (and since we are dmaster at
453 this stage, trigger the waiting smbd processes to pick up and aquire the
456 static int deferred_fetch_queue_destructor(struct ctdb_deferred_fetch_queue *dfq)
459 /* need to reprocess the packets from the queue explicitely instead of
460 just using a normal destructor since we want, need, to
461 call the clients in the same oder as the requests queued up
463 while (dfq->deferred_calls != NULL) {
464 struct ctdb_client *client;
465 struct ctdb_deferred_fetch_call *dfc = dfq->deferred_calls;
466 struct ctdb_deferred_requeue *dfr;
468 DLIST_REMOVE(dfq->deferred_calls, dfc);
470 client = reqid_find(dfc->w->ctdb->idr, dfc->w->client_id, struct ctdb_client);
471 if (client == NULL) {
472 DEBUG(DEBUG_ERR,(__location__ " Packet for disconnected client %u\n",
477 /* process it by pushing it back onto the eventloop */
478 dfr = talloc(client, struct ctdb_deferred_requeue);
480 DEBUG(DEBUG_ERR,("Failed to allocate deferred fetch requeue structure\n"));
484 dfr->dfc = talloc_steal(dfr, dfc);
485 dfr->client = client;
487 tevent_add_timer(dfc->w->ctdb->ev, client, timeval_zero(),
488 reprocess_deferred_call, dfr);
494 /* insert the new deferral context into the rb tree.
495 there should never be a pre-existing context here, but check for it
496 warn and destroy the previous context if there is already a deferral context
499 static void *insert_dfq_callback(void *parm, void *data)
502 DEBUG(DEBUG_ERR,("Already have DFQ registered. Free old %p and create new %p\n", data, parm));
508 /* if the original fetch-lock did not complete within a reasonable time,
509 free the context and context for all deferred requests to cause them to be
510 re-inserted into the event system.
512 static void dfq_timeout(struct tevent_context *ev, struct tevent_timer *te,
513 struct timeval t, void *private_data)
515 talloc_free(private_data);
518 /* This function is used in the local daemon to register a KEY in a database
520 While the remote fetch is in-flight, any futher attempts to re-fetch the
521 same record will be deferred until the fetch completes.
523 static int setup_deferred_fetch_locks(struct ctdb_db_context *ctdb_db, struct ctdb_call *call)
526 struct ctdb_deferred_fetch_queue *dfq;
528 k = ctdb_key_to_idkey(call, call->key);
530 DEBUG(DEBUG_ERR,("Failed to allocate key for deferred fetch\n"));
534 dfq = talloc(call, struct ctdb_deferred_fetch_queue);
536 DEBUG(DEBUG_ERR,("Failed to allocate key for deferred fetch queue structure\n"));
540 dfq->deferred_calls = NULL;
542 trbt_insertarray32_callback(ctdb_db->deferred_fetch, k[0], &k[0], insert_dfq_callback, dfq);
544 talloc_set_destructor(dfq, deferred_fetch_queue_destructor);
546 /* if the fetch havent completed in 30 seconds, just tear it all down
547 and let it try again as the events are reissued */
548 tevent_add_timer(ctdb_db->ctdb->ev, dfq, timeval_current_ofs(30, 0),
555 /* check if this is a duplicate request to a fetch already in-flight
556 if it is, make this call deferred to be reprocessed later when
557 the in-flight fetch completes.
559 static int requeue_duplicate_fetch(struct ctdb_db_context *ctdb_db, struct ctdb_client *client, TDB_DATA key, struct ctdb_req_call_old *c)
562 struct ctdb_deferred_fetch_queue *dfq;
563 struct ctdb_deferred_fetch_call *dfc;
565 k = ctdb_key_to_idkey(c, key);
567 DEBUG(DEBUG_ERR,("Failed to allocate key for deferred fetch\n"));
571 dfq = trbt_lookuparray32(ctdb_db->deferred_fetch, k[0], &k[0]);
580 dfc = talloc(dfq, struct ctdb_deferred_fetch_call);
582 DEBUG(DEBUG_ERR, ("Failed to allocate deferred fetch call structure\n"));
586 dfc->w = talloc(dfc, struct ctdb_daemon_packet_wrap);
587 if (dfc->w == NULL) {
588 DEBUG(DEBUG_ERR,("Failed to allocate deferred fetch daemon packet wrap structure\n"));
593 dfc->c = talloc_steal(dfc, c);
594 dfc->w->ctdb = ctdb_db->ctdb;
595 dfc->w->client_id = client->client_id;
597 DLIST_ADD_END(dfq->deferred_calls, dfc);
604 this is called when the ctdb daemon received a ctdb request call
605 from a local client over the unix domain socket
607 static void daemon_request_call_from_client(struct ctdb_client *client,
608 struct ctdb_req_call_old *c)
610 struct ctdb_call_state *state;
611 struct ctdb_db_context *ctdb_db;
612 struct daemon_call_state *dstate;
613 struct ctdb_call *call;
614 struct ctdb_ltdb_header header;
617 struct ctdb_context *ctdb = client->ctdb;
618 struct ctdb_daemon_packet_wrap *w;
620 CTDB_INCREMENT_STAT(ctdb, total_calls);
621 CTDB_INCREMENT_STAT(ctdb, pending_calls);
623 ctdb_db = find_ctdb_db(client->ctdb, c->db_id);
625 DEBUG(DEBUG_ERR, (__location__ " Unknown database in request. db_id==0x%08x",
627 CTDB_DECREMENT_STAT(ctdb, pending_calls);
631 if (ctdb_db->unhealthy_reason) {
633 * this is just a warning, as the tdb should be empty anyway,
634 * and only persistent databases can be unhealthy, which doesn't
635 * use this code patch
637 DEBUG(DEBUG_WARNING,("warn: db(%s) unhealty in daemon_request_call_from_client(): %s\n",
638 ctdb_db->db_name, ctdb_db->unhealthy_reason));
642 key.dsize = c->keylen;
644 w = talloc(ctdb, struct ctdb_daemon_packet_wrap);
645 CTDB_NO_MEMORY_VOID(ctdb, w);
648 w->client_id = client->client_id;
650 ret = ctdb_ltdb_lock_fetch_requeue(ctdb_db, key, &header,
651 (struct ctdb_req_header *)c, &data,
652 daemon_incoming_packet_wrap, w, true);
654 /* will retry later */
655 CTDB_DECREMENT_STAT(ctdb, pending_calls);
662 DEBUG(DEBUG_ERR,(__location__ " Unable to fetch record\n"));
663 CTDB_DECREMENT_STAT(ctdb, pending_calls);
668 /* check if this fetch request is a duplicate for a
669 request we already have in flight. If so defer it until
670 the first request completes.
672 if (ctdb->tunable.fetch_collapse == 1) {
673 if (requeue_duplicate_fetch(ctdb_db, client, key, c) == 0) {
674 ret = ctdb_ltdb_unlock(ctdb_db, key);
676 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
678 CTDB_DECREMENT_STAT(ctdb, pending_calls);
679 talloc_free(data.dptr);
684 /* Dont do READONLY if we don't have a tracking database */
685 if ((c->flags & CTDB_WANT_READONLY) && !ctdb_db_readonly(ctdb_db)) {
686 c->flags &= ~CTDB_WANT_READONLY;
689 if (header.flags & CTDB_REC_RO_REVOKE_COMPLETE) {
690 header.flags &= ~CTDB_REC_RO_FLAGS;
691 CTDB_INCREMENT_STAT(ctdb, total_ro_revokes);
692 CTDB_INCREMENT_DB_STAT(ctdb_db, db_ro_revokes);
693 if (ctdb_ltdb_store(ctdb_db, key, &header, data) != 0) {
694 ctdb_fatal(ctdb, "Failed to write header with cleared REVOKE flag");
696 /* and clear out the tracking data */
697 if (tdb_delete(ctdb_db->rottdb, key) != 0) {
698 DEBUG(DEBUG_ERR,(__location__ " Failed to clear out trackingdb record\n"));
702 /* if we are revoking, we must defer all other calls until the revoke
705 if (header.flags & CTDB_REC_RO_REVOKING_READONLY) {
706 talloc_free(data.dptr);
707 ret = ctdb_ltdb_unlock(ctdb_db, key);
709 if (ctdb_add_revoke_deferred_call(ctdb, ctdb_db, key, (struct ctdb_req_header *)c, daemon_incoming_packet, client) != 0) {
710 ctdb_fatal(ctdb, "Failed to add deferred call for revoke child");
712 CTDB_DECREMENT_STAT(ctdb, pending_calls);
716 if ((header.dmaster == ctdb->pnn)
717 && (!(c->flags & CTDB_WANT_READONLY))
718 && (header.flags & (CTDB_REC_RO_HAVE_DELEGATIONS|CTDB_REC_RO_HAVE_READONLY)) ) {
719 header.flags |= CTDB_REC_RO_REVOKING_READONLY;
720 if (ctdb_ltdb_store(ctdb_db, key, &header, data) != 0) {
721 ctdb_fatal(ctdb, "Failed to store record with HAVE_DELEGATIONS set");
723 ret = ctdb_ltdb_unlock(ctdb_db, key);
725 if (ctdb_start_revoke_ro_record(ctdb, ctdb_db, key, &header, data) != 0) {
726 ctdb_fatal(ctdb, "Failed to start record revoke");
728 talloc_free(data.dptr);
730 if (ctdb_add_revoke_deferred_call(ctdb, ctdb_db, key, (struct ctdb_req_header *)c, daemon_incoming_packet, client) != 0) {
731 ctdb_fatal(ctdb, "Failed to add deferred call for revoke child");
734 CTDB_DECREMENT_STAT(ctdb, pending_calls);
738 dstate = talloc(client, struct daemon_call_state);
739 if (dstate == NULL) {
740 ret = ctdb_ltdb_unlock(ctdb_db, key);
742 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
745 DEBUG(DEBUG_ERR,(__location__ " Unable to allocate dstate\n"));
746 CTDB_DECREMENT_STAT(ctdb, pending_calls);
749 dstate->start_time = timeval_current();
750 dstate->client = client;
751 dstate->reqid = c->hdr.reqid;
752 talloc_steal(dstate, data.dptr);
754 call = dstate->call = talloc_zero(dstate, struct ctdb_call);
756 ret = ctdb_ltdb_unlock(ctdb_db, key);
758 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
761 DEBUG(DEBUG_ERR,(__location__ " Unable to allocate call\n"));
762 CTDB_DECREMENT_STAT(ctdb, pending_calls);
763 CTDB_UPDATE_LATENCY(ctdb, ctdb_db, "call_from_client 1", call_latency, dstate->start_time);
767 dstate->readonly_fetch = 0;
768 call->call_id = c->callid;
770 call->call_data.dptr = c->data + c->keylen;
771 call->call_data.dsize = c->calldatalen;
772 call->flags = c->flags;
774 if (c->flags & CTDB_WANT_READONLY) {
775 /* client wants readonly record, so translate this into a
776 fetch with header. remember what the client asked for
777 so we can remap the reply back to the proper format for
778 the client in the reply
780 dstate->client_callid = call->call_id;
781 call->call_id = CTDB_FETCH_WITH_HEADER_FUNC;
782 dstate->readonly_fetch = 1;
785 if (header.dmaster == ctdb->pnn) {
786 state = ctdb_call_local_send(ctdb_db, call, &header, &data);
788 state = ctdb_daemon_call_send_remote(ctdb_db, call, &header);
789 if (ctdb->tunable.fetch_collapse == 1) {
790 /* This request triggered a remote fetch-lock.
791 set up a deferral for this key so any additional
792 fetch-locks are deferred until the current one
795 setup_deferred_fetch_locks(ctdb_db, call);
799 ret = ctdb_ltdb_unlock(ctdb_db, key);
801 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
805 DEBUG(DEBUG_ERR,(__location__ " Unable to setup call send\n"));
806 CTDB_DECREMENT_STAT(ctdb, pending_calls);
807 CTDB_UPDATE_LATENCY(ctdb, ctdb_db, "call_from_client 2", call_latency, dstate->start_time);
810 talloc_steal(state, dstate);
811 talloc_steal(client, state);
813 state->async.fn = daemon_call_from_client_callback;
814 state->async.private_data = dstate;
818 static void daemon_request_control_from_client(struct ctdb_client *client,
819 struct ctdb_req_control_old *c);
820 static void daemon_request_tunnel_from_client(struct ctdb_client *client,
821 struct ctdb_req_tunnel_old *c);
823 /* data contains a packet from the client */
824 static void daemon_incoming_packet(void *p, struct ctdb_req_header *hdr)
826 struct ctdb_client *client = talloc_get_type(p, struct ctdb_client);
828 struct ctdb_context *ctdb = client->ctdb;
830 /* place the packet as a child of a tmp_ctx. We then use
831 talloc_free() below to free it. If any of the calls want
832 to keep it, then they will steal it somewhere else, and the
833 talloc_free() will be a no-op */
834 tmp_ctx = talloc_new(client);
835 talloc_steal(tmp_ctx, hdr);
837 if (hdr->ctdb_magic != CTDB_MAGIC) {
838 ctdb_set_error(client->ctdb, "Non CTDB packet rejected in daemon\n");
842 if (hdr->ctdb_version != CTDB_PROTOCOL) {
843 ctdb_set_error(client->ctdb, "Bad CTDB version 0x%x rejected in daemon\n", hdr->ctdb_version);
847 switch (hdr->operation) {
849 CTDB_INCREMENT_STAT(ctdb, client.req_call);
850 daemon_request_call_from_client(client, (struct ctdb_req_call_old *)hdr);
853 case CTDB_REQ_MESSAGE:
854 CTDB_INCREMENT_STAT(ctdb, client.req_message);
855 daemon_request_message_from_client(client, (struct ctdb_req_message_old *)hdr);
858 case CTDB_REQ_CONTROL:
859 CTDB_INCREMENT_STAT(ctdb, client.req_control);
860 daemon_request_control_from_client(client, (struct ctdb_req_control_old *)hdr);
863 case CTDB_REQ_TUNNEL:
864 CTDB_INCREMENT_STAT(ctdb, client.req_tunnel);
865 daemon_request_tunnel_from_client(client, (struct ctdb_req_tunnel_old *)hdr);
869 DEBUG(DEBUG_CRIT,(__location__ " daemon: unrecognized operation %u\n",
874 talloc_free(tmp_ctx);
878 called when the daemon gets a incoming packet
880 static void ctdb_daemon_read_cb(uint8_t *data, size_t cnt, void *args)
882 struct ctdb_client *client = talloc_get_type(args, struct ctdb_client);
883 struct ctdb_req_header *hdr;
890 CTDB_INCREMENT_STAT(client->ctdb, client_packets_recv);
892 if (cnt < sizeof(*hdr)) {
893 ctdb_set_error(client->ctdb, "Bad packet length %u in daemon\n",
897 hdr = (struct ctdb_req_header *)data;
898 if (cnt != hdr->length) {
899 ctdb_set_error(client->ctdb, "Bad header length %u expected %u\n in daemon",
900 (unsigned)hdr->length, (unsigned)cnt);
904 if (hdr->ctdb_magic != CTDB_MAGIC) {
905 ctdb_set_error(client->ctdb, "Non CTDB packet rejected\n");
909 if (hdr->ctdb_version != CTDB_PROTOCOL) {
910 ctdb_set_error(client->ctdb, "Bad CTDB version 0x%x rejected in daemon\n", hdr->ctdb_version);
914 DEBUG(DEBUG_DEBUG,(__location__ " client request %u of type %u length %u from "
915 "node %u to %u\n", hdr->reqid, hdr->operation, hdr->length,
916 hdr->srcnode, hdr->destnode));
918 /* it is the responsibility of the incoming packet function to free 'data' */
919 daemon_incoming_packet(client, hdr);
923 static int ctdb_clientpid_destructor(struct ctdb_client_pid_list *client_pid)
925 if (client_pid->ctdb->client_pids != NULL) {
926 DLIST_REMOVE(client_pid->ctdb->client_pids, client_pid);
933 static void ctdb_accept_client(struct tevent_context *ev,
934 struct tevent_fd *fde, uint16_t flags,
937 struct sockaddr_un addr;
940 struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
941 struct ctdb_client *client;
942 struct ctdb_client_pid_list *client_pid;
946 memset(&addr, 0, sizeof(addr));
948 fd = accept(ctdb->daemon.sd, (struct sockaddr *)&addr, &len);
952 smb_set_close_on_exec(fd);
954 ret = set_blocking(fd, false);
958 " failed to set socket non-blocking (%s)\n",
964 set_close_on_exec(fd);
966 DEBUG(DEBUG_DEBUG,(__location__ " Created SOCKET FD:%d to connected child\n", fd));
968 client = talloc_zero(ctdb, struct ctdb_client);
969 if (ctdb_get_peer_pid(fd, &peer_pid) == 0) {
970 DEBUG(DEBUG_INFO,("Connected client with pid:%u\n", (unsigned)peer_pid));
975 client->client_id = reqid_new(ctdb->idr, client);
976 client->pid = peer_pid;
978 client_pid = talloc(client, struct ctdb_client_pid_list);
979 if (client_pid == NULL) {
980 DEBUG(DEBUG_ERR,("Failed to allocate client pid structure\n"));
985 client_pid->ctdb = ctdb;
986 client_pid->pid = peer_pid;
987 client_pid->client = client;
989 DLIST_ADD(ctdb->client_pids, client_pid);
991 client->queue = ctdb_queue_setup(ctdb, client, fd, CTDB_DS_ALIGNMENT,
992 ctdb_daemon_read_cb, client,
993 "client-%u", client->pid);
995 talloc_set_destructor(client, ctdb_client_destructor);
996 talloc_set_destructor(client_pid, ctdb_clientpid_destructor);
1003 create a unix domain socket and bind it
1004 return a file descriptor open on the socket
1006 static int ux_socket_bind(struct ctdb_context *ctdb)
1008 struct sockaddr_un addr;
1011 ctdb->daemon.sd = socket(AF_UNIX, SOCK_STREAM, 0);
1012 if (ctdb->daemon.sd == -1) {
1016 memset(&addr, 0, sizeof(addr));
1017 addr.sun_family = AF_UNIX;
1018 strncpy(addr.sun_path, ctdb->daemon.name, sizeof(addr.sun_path)-1);
1020 if (! sock_clean(ctdb->daemon.name)) {
1024 set_close_on_exec(ctdb->daemon.sd);
1026 ret = set_blocking(ctdb->daemon.sd, false);
1030 " failed to set socket non-blocking (%s)\n",
1035 if (bind(ctdb->daemon.sd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
1036 DEBUG(DEBUG_CRIT,("Unable to bind on ctdb socket '%s'\n", ctdb->daemon.name));
1040 if (chown(ctdb->daemon.name, geteuid(), getegid()) != 0 ||
1041 chmod(ctdb->daemon.name, 0700) != 0) {
1042 DEBUG(DEBUG_CRIT,("Unable to secure ctdb socket '%s', ctdb->daemon.name\n", ctdb->daemon.name));
1047 if (listen(ctdb->daemon.sd, 100) != 0) {
1048 DEBUG(DEBUG_CRIT,("Unable to listen on ctdb socket '%s'\n", ctdb->daemon.name));
1052 DEBUG(DEBUG_NOTICE, ("Listening to ctdb socket %s\n",
1053 ctdb->daemon.name));
1057 close(ctdb->daemon.sd);
1058 ctdb->daemon.sd = -1;
1062 static void initialise_node_flags (struct ctdb_context *ctdb)
1064 if (ctdb->pnn == -1) {
1065 ctdb_fatal(ctdb, "PNN is set to -1 (unknown value)");
1068 ctdb->nodes[ctdb->pnn]->flags &= ~NODE_FLAGS_DISCONNECTED;
1070 /* do we start out in DISABLED mode? */
1071 if (ctdb->start_as_disabled != 0) {
1073 ("This node is configured to start in DISABLED state\n"));
1074 ctdb->nodes[ctdb->pnn]->flags |= NODE_FLAGS_DISABLED;
1076 /* do we start out in STOPPED mode? */
1077 if (ctdb->start_as_stopped != 0) {
1079 ("This node is configured to start in STOPPED state\n"));
1080 ctdb->nodes[ctdb->pnn]->flags |= NODE_FLAGS_STOPPED;
1084 static void ctdb_setup_event_callback(struct ctdb_context *ctdb, int status,
1088 ctdb_die(ctdb, "Failed to run setup event");
1090 ctdb_run_notification_script(ctdb, "setup");
1092 /* Start the recovery daemon */
1093 if (ctdb_start_recoverd(ctdb) != 0) {
1094 DEBUG(DEBUG_ALERT,("Failed to start recovery daemon\n"));
1098 ctdb_start_periodic_events(ctdb);
1100 ctdb_wait_for_first_recovery(ctdb);
1103 static struct timeval tevent_before_wait_ts;
1104 static struct timeval tevent_after_wait_ts;
1106 static void ctdb_tevent_trace_init(void)
1110 now = timeval_current();
1112 tevent_before_wait_ts = now;
1113 tevent_after_wait_ts = now;
1116 static void ctdb_tevent_trace(enum tevent_trace_point tp,
1119 struct timeval diff;
1121 struct ctdb_context *ctdb =
1122 talloc_get_type(private_data, struct ctdb_context);
1124 if (getpid() != ctdb->ctdbd_pid) {
1128 now = timeval_current();
1131 case TEVENT_TRACE_BEFORE_WAIT:
1132 diff = timeval_until(&tevent_after_wait_ts, &now);
1133 if (diff.tv_sec > 3) {
1135 ("Handling event took %ld seconds!\n",
1136 (long)diff.tv_sec));
1138 tevent_before_wait_ts = now;
1141 case TEVENT_TRACE_AFTER_WAIT:
1142 diff = timeval_until(&tevent_before_wait_ts, &now);
1143 if (diff.tv_sec > 3) {
1145 ("No event for %ld seconds!\n",
1146 (long)diff.tv_sec));
1148 tevent_after_wait_ts = now;
1152 /* Do nothing for future tevent trace points */ ;
1156 static void ctdb_remove_pidfile(void)
1158 TALLOC_FREE(ctdbd_pidfile_ctx);
1161 static void ctdb_create_pidfile(TALLOC_CTX *mem_ctx)
1163 if (ctdbd_pidfile != NULL) {
1164 int ret = pidfile_context_create(mem_ctx, ctdbd_pidfile,
1165 &ctdbd_pidfile_ctx);
1168 ("Failed to create PID file %s\n",
1173 DEBUG(DEBUG_NOTICE, ("Created PID file %s\n", ctdbd_pidfile));
1174 atexit(ctdb_remove_pidfile);
1178 static void ctdb_initialise_vnn_map(struct ctdb_context *ctdb)
1182 /* initialize the vnn mapping table, skipping any deleted nodes */
1183 ctdb->vnn_map = talloc(ctdb, struct ctdb_vnn_map);
1184 CTDB_NO_MEMORY_FATAL(ctdb, ctdb->vnn_map);
1187 for (i = 0; i < ctdb->num_nodes; i++) {
1188 if ((ctdb->nodes[i]->flags & NODE_FLAGS_DELETED) == 0) {
1193 ctdb->vnn_map->generation = INVALID_GENERATION;
1194 ctdb->vnn_map->size = count;
1195 ctdb->vnn_map->map = talloc_array(ctdb->vnn_map, uint32_t, ctdb->vnn_map->size);
1196 CTDB_NO_MEMORY_FATAL(ctdb, ctdb->vnn_map->map);
1198 for(i=0, j=0; i < ctdb->vnn_map->size; i++) {
1199 if (ctdb->nodes[i]->flags & NODE_FLAGS_DELETED) {
1202 ctdb->vnn_map->map[j] = i;
1207 static void ctdb_set_my_pnn(struct ctdb_context *ctdb)
1211 if (ctdb->address == NULL) {
1213 "Can not determine PNN - node address is not set\n");
1216 nodeid = ctdb_ip_to_nodeid(ctdb, ctdb->address);
1219 "Can not determine PNN - node address not found in node list\n");
1222 ctdb->pnn = ctdb->nodes[nodeid]->pnn;
1223 DEBUG(DEBUG_NOTICE, ("PNN is %u\n", ctdb->pnn));
1227 start the protocol going as a daemon
1229 int ctdb_start_daemon(struct ctdb_context *ctdb, bool do_fork)
1232 struct tevent_fd *fde;
1234 become_daemon(do_fork, false, false);
1236 ignore_signal(SIGPIPE);
1237 ignore_signal(SIGUSR1);
1239 ctdb->ctdbd_pid = getpid();
1240 DEBUG(DEBUG_ERR, ("Starting CTDBD (Version %s) as PID: %u\n",
1241 ctdb_version_string, ctdb->ctdbd_pid));
1242 ctdb_create_pidfile(ctdb);
1244 /* create a unix domain stream socket to listen to */
1245 res = ux_socket_bind(ctdb);
1247 DEBUG(DEBUG_ALERT,("Cannot continue. Exiting!\n"));
1251 /* Make sure we log something when the daemon terminates.
1252 * This must be the first exit handler to run (so the last to
1255 __ctdbd_pid = getpid();
1256 atexit(print_exit_message);
1258 if (ctdb->do_setsched) {
1259 /* try to set us up as realtime */
1260 if (!set_scheduler()) {
1263 DEBUG(DEBUG_NOTICE, ("Set real-time scheduler priority\n"));
1266 ctdb->ev = tevent_context_init(NULL);
1267 if (ctdb->ev == NULL) {
1268 DEBUG(DEBUG_ALERT,("tevent_context_init() failed\n"));
1271 tevent_loop_allow_nesting(ctdb->ev);
1272 ctdb_tevent_trace_init();
1273 tevent_set_trace_callback(ctdb->ev, ctdb_tevent_trace, ctdb);
1275 /* set up a handler to pick up sigchld */
1276 if (ctdb_init_sigchld(ctdb) == NULL) {
1277 DEBUG(DEBUG_CRIT,("Failed to set up signal handler for SIGCHLD\n"));
1282 ctdb_set_child_logging(ctdb);
1285 TALLOC_FREE(ctdb->srv);
1286 if (srvid_init(ctdb, &ctdb->srv) != 0) {
1287 DEBUG(DEBUG_CRIT,("Failed to setup message srvid context\n"));
1291 TALLOC_FREE(ctdb->tunnels);
1292 if (srvid_init(ctdb, &ctdb->tunnels) != 0) {
1293 DEBUG(DEBUG_ERR, ("Failed to setup tunnels context\n"));
1297 /* initialize statistics collection */
1298 ctdb_statistics_init(ctdb);
1300 /* force initial recovery for election */
1301 ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE;
1303 if (ctdb_start_eventd(ctdb) != 0) {
1304 DEBUG(DEBUG_ERR, ("Failed to start event daemon\n"));
1308 ctdb_set_runstate(ctdb, CTDB_RUNSTATE_INIT);
1309 ret = ctdb_event_script(ctdb, CTDB_EVENT_INIT);
1311 ctdb_die(ctdb, "Failed to run init event\n");
1313 ctdb_run_notification_script(ctdb, "init");
1315 if (strcmp(ctdb->transport, "tcp") == 0) {
1316 ret = ctdb_tcp_init(ctdb);
1318 #ifdef USE_INFINIBAND
1319 if (strcmp(ctdb->transport, "ib") == 0) {
1320 ret = ctdb_ibw_init(ctdb);
1324 DEBUG(DEBUG_ERR,("Failed to initialise transport '%s'\n", ctdb->transport));
1328 if (ctdb->methods == NULL) {
1329 DEBUG(DEBUG_ALERT,(__location__ " Can not initialize transport. ctdb->methods is NULL\n"));
1330 ctdb_fatal(ctdb, "transport is unavailable. can not initialize.");
1333 /* Initialise the transport. This sets the node address if it
1334 * was not set via the command-line. */
1335 if (ctdb->methods->initialise(ctdb) != 0) {
1336 ctdb_fatal(ctdb, "transport failed to initialise");
1339 ctdb_set_my_pnn(ctdb);
1341 initialise_node_flags(ctdb);
1343 if (ctdb->public_addresses_file) {
1344 ret = ctdb_set_public_addresses(ctdb, true);
1346 DEBUG(DEBUG_ALERT,("Unable to setup public address list\n"));
1351 ctdb_initialise_vnn_map(ctdb);
1353 /* attach to existing databases */
1354 if (ctdb_attach_databases(ctdb) != 0) {
1355 ctdb_fatal(ctdb, "Failed to attach to databases\n");
1358 /* start frozen, then let the first election sort things out */
1359 if (!ctdb_blocking_freeze(ctdb)) {
1360 ctdb_fatal(ctdb, "Failed to get initial freeze\n");
1363 /* now start accepting clients, only can do this once frozen */
1364 fde = tevent_add_fd(ctdb->ev, ctdb, ctdb->daemon.sd, TEVENT_FD_READ,
1365 ctdb_accept_client, ctdb);
1367 ctdb_fatal(ctdb, "Failed to add daemon socket to event loop");
1369 tevent_fd_set_auto_close(fde);
1371 /* Start the transport */
1372 if (ctdb->methods->start(ctdb) != 0) {
1373 DEBUG(DEBUG_ALERT,("transport failed to start!\n"));
1374 ctdb_fatal(ctdb, "transport failed to start");
1377 /* Recovery daemon and timed events are started from the
1378 * callback, only after the setup event completes
1381 ctdb_set_runstate(ctdb, CTDB_RUNSTATE_SETUP);
1382 ret = ctdb_event_script_callback(ctdb,
1384 ctdb_setup_event_callback,
1390 DEBUG(DEBUG_CRIT,("Failed to set up 'setup' event\n"));
1394 lockdown_memory(ctdb->valgrinding);
1396 /* go into a wait loop to allow other nodes to complete */
1397 tevent_loop_wait(ctdb->ev);
1399 DEBUG(DEBUG_CRIT,("event_loop_wait() returned. this should not happen\n"));
1404 allocate a packet for use in daemon<->daemon communication
1406 struct ctdb_req_header *_ctdb_transport_allocate(struct ctdb_context *ctdb,
1407 TALLOC_CTX *mem_ctx,
1408 enum ctdb_operation operation,
1409 size_t length, size_t slength,
1413 struct ctdb_req_header *hdr;
1415 length = MAX(length, slength);
1416 size = (length+(CTDB_DS_ALIGNMENT-1)) & ~(CTDB_DS_ALIGNMENT-1);
1418 if (ctdb->methods == NULL) {
1419 DEBUG(DEBUG_INFO,(__location__ " Unable to allocate transport packet for operation %u of length %u. Transport is DOWN.\n",
1420 operation, (unsigned)length));
1424 hdr = (struct ctdb_req_header *)ctdb->methods->allocate_pkt(mem_ctx, size);
1426 DEBUG(DEBUG_ERR,("Unable to allocate transport packet for operation %u of length %u\n",
1427 operation, (unsigned)length));
1430 talloc_set_name_const(hdr, type);
1431 memset(hdr, 0, slength);
1432 hdr->length = length;
1433 hdr->operation = operation;
1434 hdr->ctdb_magic = CTDB_MAGIC;
1435 hdr->ctdb_version = CTDB_PROTOCOL;
1436 hdr->generation = ctdb->vnn_map->generation;
1437 hdr->srcnode = ctdb->pnn;
1442 struct daemon_control_state {
1443 struct daemon_control_state *next, *prev;
1444 struct ctdb_client *client;
1445 struct ctdb_req_control_old *c;
1447 struct ctdb_node *node;
1451 callback when a control reply comes in
1453 static void daemon_control_callback(struct ctdb_context *ctdb,
1454 int32_t status, TDB_DATA data,
1455 const char *errormsg,
1458 struct daemon_control_state *state = talloc_get_type(private_data,
1459 struct daemon_control_state);
1460 struct ctdb_client *client = state->client;
1461 struct ctdb_reply_control_old *r;
1465 /* construct a message to send to the client containing the data */
1466 len = offsetof(struct ctdb_reply_control_old, data) + data.dsize;
1468 len += strlen(errormsg);
1470 r = ctdbd_allocate_pkt(ctdb, state, CTDB_REPLY_CONTROL, len,
1471 struct ctdb_reply_control_old);
1472 CTDB_NO_MEMORY_VOID(ctdb, r);
1474 r->hdr.reqid = state->reqid;
1476 r->datalen = data.dsize;
1478 memcpy(&r->data[0], data.dptr, data.dsize);
1480 r->errorlen = strlen(errormsg);
1481 memcpy(&r->data[r->datalen], errormsg, r->errorlen);
1484 ret = daemon_queue_send(client, &r->hdr);
1491 fail all pending controls to a disconnected node
1493 void ctdb_daemon_cancel_controls(struct ctdb_context *ctdb, struct ctdb_node *node)
1495 struct daemon_control_state *state;
1496 while ((state = node->pending_controls)) {
1497 DLIST_REMOVE(node->pending_controls, state);
1498 daemon_control_callback(ctdb, (uint32_t)-1, tdb_null,
1499 "node is disconnected", state);
1504 destroy a daemon_control_state
1506 static int daemon_control_destructor(struct daemon_control_state *state)
1509 DLIST_REMOVE(state->node->pending_controls, state);
1515 this is called when the ctdb daemon received a ctdb request control
1516 from a local client over the unix domain socket
1518 static void daemon_request_control_from_client(struct ctdb_client *client,
1519 struct ctdb_req_control_old *c)
1523 struct daemon_control_state *state;
1524 TALLOC_CTX *tmp_ctx = talloc_new(client);
1526 if (c->hdr.destnode == CTDB_CURRENT_NODE) {
1527 c->hdr.destnode = client->ctdb->pnn;
1530 state = talloc(client, struct daemon_control_state);
1531 CTDB_NO_MEMORY_VOID(client->ctdb, state);
1533 state->client = client;
1534 state->c = talloc_steal(state, c);
1535 state->reqid = c->hdr.reqid;
1536 if (ctdb_validate_pnn(client->ctdb, c->hdr.destnode)) {
1537 state->node = client->ctdb->nodes[c->hdr.destnode];
1538 DLIST_ADD(state->node->pending_controls, state);
1543 talloc_set_destructor(state, daemon_control_destructor);
1545 if (c->flags & CTDB_CTRL_FLAG_NOREPLY) {
1546 talloc_steal(tmp_ctx, state);
1549 data.dptr = &c->data[0];
1550 data.dsize = c->datalen;
1551 res = ctdb_daemon_send_control(client->ctdb, c->hdr.destnode,
1552 c->srvid, c->opcode, client->client_id,
1554 data, daemon_control_callback,
1557 DEBUG(DEBUG_ERR,(__location__ " Failed to send control to remote node %u\n",
1561 talloc_free(tmp_ctx);
1564 static void daemon_request_tunnel_from_client(struct ctdb_client *client,
1565 struct ctdb_req_tunnel_old *c)
1570 if (! ctdb_validate_pnn(client->ctdb, c->hdr.destnode)) {
1571 DEBUG(DEBUG_ERR, ("Invalid destination 0x%x\n",
1576 ret = srvid_exists(client->ctdb->tunnels, c->tunnel_id, NULL);
1579 ("tunnel id 0x%"PRIx64" not registered, dropping pkt\n",
1585 .dsize = c->datalen,
1586 .dptr = &c->data[0],
1589 ret = ctdb_daemon_send_tunnel(client->ctdb, c->hdr.destnode,
1590 c->tunnel_id, c->flags, data);
1592 DEBUG(DEBUG_ERR, ("Failed to set tunnel to remote note %u\n",
1598 register a call function
1600 int ctdb_daemon_set_call(struct ctdb_context *ctdb, uint32_t db_id,
1601 ctdb_fn_t fn, int id)
1603 struct ctdb_registered_call *call;
1604 struct ctdb_db_context *ctdb_db;
1606 ctdb_db = find_ctdb_db(ctdb, db_id);
1607 if (ctdb_db == NULL) {
1611 call = talloc(ctdb_db, struct ctdb_registered_call);
1615 DLIST_ADD(ctdb_db->calls, call);
1622 this local messaging handler is ugly, but is needed to prevent
1623 recursion in ctdb_send_message() when the destination node is the
1624 same as the source node
1626 struct ctdb_local_message {
1627 struct ctdb_context *ctdb;
1632 static void ctdb_local_message_trigger(struct tevent_context *ev,
1633 struct tevent_timer *te,
1634 struct timeval t, void *private_data)
1636 struct ctdb_local_message *m = talloc_get_type(
1637 private_data, struct ctdb_local_message);
1639 srvid_dispatch(m->ctdb->srv, m->srvid, CTDB_SRVID_ALL, m->data);
1643 static int ctdb_local_message(struct ctdb_context *ctdb, uint64_t srvid, TDB_DATA data)
1645 struct ctdb_local_message *m;
1646 m = talloc(ctdb, struct ctdb_local_message);
1647 CTDB_NO_MEMORY(ctdb, m);
1652 m->data.dptr = talloc_memdup(m, m->data.dptr, m->data.dsize);
1653 if (m->data.dptr == NULL) {
1658 /* this needs to be done as an event to prevent recursion */
1659 tevent_add_timer(ctdb->ev, m, timeval_zero(),
1660 ctdb_local_message_trigger, m);
1667 int ctdb_daemon_send_message(struct ctdb_context *ctdb, uint32_t pnn,
1668 uint64_t srvid, TDB_DATA data)
1670 struct ctdb_req_message_old *r;
1673 if (ctdb->methods == NULL) {
1674 DEBUG(DEBUG_INFO,(__location__ " Failed to send message. Transport is DOWN\n"));
1678 /* see if this is a message to ourselves */
1679 if (pnn == ctdb->pnn) {
1680 return ctdb_local_message(ctdb, srvid, data);
1683 len = offsetof(struct ctdb_req_message_old, data) + data.dsize;
1684 r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_MESSAGE, len,
1685 struct ctdb_req_message_old);
1686 CTDB_NO_MEMORY(ctdb, r);
1688 r->hdr.destnode = pnn;
1690 r->datalen = data.dsize;
1691 memcpy(&r->data[0], data.dptr, data.dsize);
1693 ctdb_queue_packet(ctdb, &r->hdr);
1701 struct ctdb_client_notify_list {
1702 struct ctdb_client_notify_list *next, *prev;
1703 struct ctdb_context *ctdb;
1709 static int ctdb_client_notify_destructor(struct ctdb_client_notify_list *nl)
1713 DEBUG(DEBUG_ERR,("Sending client notify message for srvid:%llu\n", (unsigned long long)nl->srvid));
1715 ret = ctdb_daemon_send_message(nl->ctdb, CTDB_BROADCAST_CONNECTED, (unsigned long long)nl->srvid, nl->data);
1717 DEBUG(DEBUG_ERR,("Failed to send client notify message\n"));
1723 int32_t ctdb_control_register_notify(struct ctdb_context *ctdb, uint32_t client_id, TDB_DATA indata)
1725 struct ctdb_notify_data_old *notify = (struct ctdb_notify_data_old *)indata.dptr;
1726 struct ctdb_client *client = reqid_find(ctdb->idr, client_id, struct ctdb_client);
1727 struct ctdb_client_notify_list *nl;
1729 DEBUG(DEBUG_INFO,("Register srvid %llu for client %d\n", (unsigned long long)notify->srvid, client_id));
1731 if (indata.dsize < offsetof(struct ctdb_notify_data_old, notify_data)) {
1732 DEBUG(DEBUG_ERR,(__location__ " Too little data in control : %d\n", (int)indata.dsize));
1736 if (indata.dsize != (notify->len + offsetof(struct ctdb_notify_data_old, notify_data))) {
1737 DEBUG(DEBUG_ERR,(__location__ " Wrong amount of data in control. Got %d, expected %d\n", (int)indata.dsize, (int)(notify->len + offsetof(struct ctdb_notify_data_old, notify_data))));
1742 if (client == NULL) {
1743 DEBUG(DEBUG_ERR,(__location__ " Could not find client parent structure. You can not send this control to a remote node\n"));
1747 for(nl=client->notify; nl; nl=nl->next) {
1748 if (nl->srvid == notify->srvid) {
1753 DEBUG(DEBUG_ERR,(__location__ " Notification for srvid:%llu already exists for this client\n", (unsigned long long)notify->srvid));
1757 nl = talloc(client, struct ctdb_client_notify_list);
1758 CTDB_NO_MEMORY(ctdb, nl);
1760 nl->srvid = notify->srvid;
1761 nl->data.dsize = notify->len;
1762 nl->data.dptr = talloc_memdup(nl, notify->notify_data,
1764 CTDB_NO_MEMORY(ctdb, nl->data.dptr);
1766 DLIST_ADD(client->notify, nl);
1767 talloc_set_destructor(nl, ctdb_client_notify_destructor);
1772 int32_t ctdb_control_deregister_notify(struct ctdb_context *ctdb, uint32_t client_id, TDB_DATA indata)
1774 uint64_t srvid = *(uint64_t *)indata.dptr;
1775 struct ctdb_client *client = reqid_find(ctdb->idr, client_id, struct ctdb_client);
1776 struct ctdb_client_notify_list *nl;
1778 DEBUG(DEBUG_INFO,("Deregister srvid %llu for client %d\n", (unsigned long long)srvid, client_id));
1780 if (client == NULL) {
1781 DEBUG(DEBUG_ERR,(__location__ " Could not find client parent structure. You can not send this control to a remote node\n"));
1785 for(nl=client->notify; nl; nl=nl->next) {
1786 if (nl->srvid == srvid) {
1791 DEBUG(DEBUG_ERR,(__location__ " No notification for srvid:%llu found for this client\n", (unsigned long long)srvid));
1795 DLIST_REMOVE(client->notify, nl);
1796 talloc_set_destructor(nl, NULL);
1802 struct ctdb_client *ctdb_find_client_by_pid(struct ctdb_context *ctdb, pid_t pid)
1804 struct ctdb_client_pid_list *client_pid;
1806 for (client_pid = ctdb->client_pids; client_pid; client_pid=client_pid->next) {
1807 if (client_pid->pid == pid) {
1808 return client_pid->client;
1815 /* This control is used by samba when probing if a process (of a samba daemon)
1817 Samba does this when it needs/wants to check if a subrecord in one of the
1818 databases is still valid, or if it is stale and can be removed.
1819 If the node is in unhealthy or stopped state we just kill of the samba
1820 process holding this sub-record and return to the calling samba that
1821 the process does not exist.
1822 This allows us to forcefully recall subrecords registered by samba processes
1823 on banned and stopped nodes.
1825 int32_t ctdb_control_process_exists(struct ctdb_context *ctdb, pid_t pid)
1827 struct ctdb_client *client;
1829 client = ctdb_find_client_by_pid(ctdb, pid);
1830 if (client == NULL) {
1834 if (ctdb->nodes[ctdb->pnn]->flags & NODE_FLAGS_INACTIVE) {
1836 ("Killing client with pid:%d on banned/stopped node\n",
1838 talloc_free(client);
1842 return kill(pid, 0);
1845 int32_t ctdb_control_check_pid_srvid(struct ctdb_context *ctdb,
1848 struct ctdb_client_pid_list *client_pid;
1853 pid = *(pid_t *)indata.dptr;
1854 srvid = *(uint64_t *)(indata.dptr + sizeof(pid_t));
1856 for (client_pid = ctdb->client_pids;
1858 client_pid = client_pid->next) {
1859 if (client_pid->pid == pid) {
1860 ret = srvid_exists(ctdb->srv, srvid,
1861 client_pid->client);
1871 int ctdb_control_getnodesfile(struct ctdb_context *ctdb, uint32_t opcode, TDB_DATA indata, TDB_DATA *outdata)
1873 struct ctdb_node_map_old *node_map = NULL;
1875 CHECK_CONTROL_DATA_SIZE(0);
1877 node_map = ctdb_read_nodes_file(ctdb, ctdb->nodes_file);
1878 if (node_map == NULL) {
1879 DEBUG(DEBUG_ERR, ("Failed to read nodes file\n"));
1883 outdata->dptr = (unsigned char *)node_map;
1884 outdata->dsize = talloc_get_size(outdata->dptr);
1889 void ctdb_shutdown_sequence(struct ctdb_context *ctdb, int exit_code)
1891 if (ctdb->runstate == CTDB_RUNSTATE_SHUTDOWN) {
1892 DEBUG(DEBUG_NOTICE,("Already shutting down so will not proceed.\n"));
1896 DEBUG(DEBUG_ERR,("Shutdown sequence commencing.\n"));
1897 ctdb_set_runstate(ctdb, CTDB_RUNSTATE_SHUTDOWN);
1898 ctdb_stop_recoverd(ctdb);
1899 ctdb_stop_keepalive(ctdb);
1900 ctdb_stop_monitoring(ctdb);
1901 ctdb_release_all_ips(ctdb);
1902 ctdb_event_script(ctdb, CTDB_EVENT_SHUTDOWN);
1903 ctdb_stop_eventd(ctdb);
1904 if (ctdb->methods != NULL && ctdb->methods->shutdown != NULL) {
1905 ctdb->methods->shutdown(ctdb);
1908 DEBUG(DEBUG_ERR,("Shutdown sequence complete, exiting.\n"));
1912 /* When forking the main daemon and the child process needs to connect
1913 * back to the daemon as a client process, this function can be used
1914 * to change the ctdb context from daemon into client mode. The child
1915 * process must be created using ctdb_fork() and not fork() -
1916 * ctdb_fork() does some necessary housekeeping.
1918 int switch_from_server_to_client(struct ctdb_context *ctdb)
1922 /* get a new event context */
1923 ctdb->ev = tevent_context_init(ctdb);
1924 if (ctdb->ev == NULL) {
1925 DEBUG(DEBUG_ALERT,("tevent_context_init() failed\n"));
1928 tevent_loop_allow_nesting(ctdb->ev);
1930 /* Connect to main CTDB daemon */
1931 ret = ctdb_socket_connect(ctdb);
1933 DEBUG(DEBUG_ALERT, (__location__ " Failed to init ctdb client\n"));
1937 ctdb->can_send_controls = true;