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/>.
22 #include "lib/tdb/include/tdb.h"
23 #include "lib/events/events.h"
24 #include "lib/util/dlinklist.h"
25 #include "system/network.h"
26 #include "system/filesys.h"
27 #include "system/wait.h"
28 #include "../include/ctdb.h"
29 #include "../include/ctdb_private.h"
30 #include <sys/socket.h>
32 static void daemon_incoming_packet(void *, struct ctdb_req_header *);
35 static void print_exit_message(void)
37 DEBUG(DEBUG_NOTICE,("CTDB daemon shutting down\n"));
41 /* called when the "startup" event script has finished */
42 static void ctdb_start_transport(struct ctdb_context *ctdb)
44 if (ctdb->methods == NULL) {
45 DEBUG(DEBUG_ALERT,(__location__ " startup event finished but transport is DOWN.\n"));
46 ctdb_fatal(ctdb, "transport is not initialized but startup completed");
49 /* start the transport running */
50 if (ctdb->methods->start(ctdb) != 0) {
51 DEBUG(DEBUG_ALERT,("transport failed to start!\n"));
52 ctdb_fatal(ctdb, "transport failed to start");
55 /* start the recovery daemon process */
56 if (ctdb_start_recoverd(ctdb) != 0) {
57 DEBUG(DEBUG_ALERT,("Failed to start recovery daemon\n"));
61 /* Make sure we log something when the daemon terminates */
62 atexit(print_exit_message);
64 /* start monitoring for connected/disconnected nodes */
65 ctdb_start_keepalive(ctdb);
67 /* start monitoring for node health */
68 ctdb_start_monitoring(ctdb);
70 /* start periodic update of tcp tickle lists */
71 ctdb_start_tcp_tickle_update(ctdb);
73 /* start listening for recovery daemon pings */
74 ctdb_control_recd_ping(ctdb);
77 static void block_signal(int signum)
81 memset(&act, 0, sizeof(act));
83 act.sa_handler = SIG_IGN;
84 sigemptyset(&act.sa_mask);
85 sigaddset(&act.sa_mask, signum);
86 sigaction(signum, &act, NULL);
91 send a packet to a client
93 static int daemon_queue_send(struct ctdb_client *client, struct ctdb_req_header *hdr)
95 client->ctdb->statistics.client_packets_sent++;
96 return ctdb_queue_send(client->queue, (uint8_t *)hdr, hdr->length);
100 message handler for when we are in daemon mode. This redirects the message
103 static void daemon_message_handler(struct ctdb_context *ctdb, uint64_t srvid,
104 TDB_DATA data, void *private_data)
106 struct ctdb_client *client = talloc_get_type(private_data, struct ctdb_client);
107 struct ctdb_req_message *r;
110 /* construct a message to send to the client containing the data */
111 len = offsetof(struct ctdb_req_message, data) + data.dsize;
112 r = ctdbd_allocate_pkt(ctdb, ctdb, CTDB_REQ_MESSAGE,
113 len, struct ctdb_req_message);
114 CTDB_NO_MEMORY_VOID(ctdb, r);
116 talloc_set_name_const(r, "req_message packet");
119 r->datalen = data.dsize;
120 memcpy(&r->data[0], data.dptr, data.dsize);
122 daemon_queue_send(client, &r->hdr);
129 this is called when the ctdb daemon received a ctdb request to
130 set the srvid from the client
132 int daemon_register_message_handler(struct ctdb_context *ctdb, uint32_t client_id, uint64_t srvid)
134 struct ctdb_client *client = ctdb_reqid_find(ctdb, client_id, struct ctdb_client);
136 if (client == NULL) {
137 DEBUG(DEBUG_ERR,("Bad client_id in daemon_request_register_message_handler\n"));
140 res = ctdb_register_message_handler(ctdb, client, srvid, daemon_message_handler, client);
142 DEBUG(DEBUG_ERR,(__location__ " Failed to register handler %llu in daemon\n",
143 (unsigned long long)srvid));
145 DEBUG(DEBUG_INFO,(__location__ " Registered message handler for srvid=%llu\n",
146 (unsigned long long)srvid));
149 /* this is a hack for Samba - we now know the pid of the Samba client */
150 if ((srvid & 0xFFFFFFFF) == srvid &&
151 kill(srvid, 0) == 0) {
153 DEBUG(DEBUG_INFO,(__location__ " Registered PID %u for client %u\n",
154 (unsigned)client->pid, client_id));
160 this is called when the ctdb daemon received a ctdb request to
161 remove a srvid from the client
163 int daemon_deregister_message_handler(struct ctdb_context *ctdb, uint32_t client_id, uint64_t srvid)
165 struct ctdb_client *client = ctdb_reqid_find(ctdb, client_id, struct ctdb_client);
166 if (client == NULL) {
167 DEBUG(DEBUG_ERR,("Bad client_id in daemon_request_deregister_message_handler\n"));
170 return ctdb_deregister_message_handler(ctdb, srvid, client);
175 destroy a ctdb_client
177 static int ctdb_client_destructor(struct ctdb_client *client)
179 ctdb_takeover_client_destructor_hook(client);
180 ctdb_reqid_remove(client->ctdb, client->client_id);
181 if (client->ctdb->statistics.num_clients) {
182 client->ctdb->statistics.num_clients--;
185 if (client->num_persistent_updates != 0) {
186 DEBUG(DEBUG_ERR,(__location__ " Client disconnecting with %u persistent updates in flight. Starting recovery\n", client->num_persistent_updates));
187 client->ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE;
195 this is called when the ctdb daemon received a ctdb request message
196 from a local client over the unix domain socket
198 static void daemon_request_message_from_client(struct ctdb_client *client,
199 struct ctdb_req_message *c)
204 /* maybe the message is for another client on this node */
205 if (ctdb_get_pnn(client->ctdb)==c->hdr.destnode) {
206 ctdb_request_message(client->ctdb, (struct ctdb_req_header *)c);
210 /* its for a remote node */
211 data.dptr = &c->data[0];
212 data.dsize = c->datalen;
213 res = ctdb_daemon_send_message(client->ctdb, c->hdr.destnode,
216 DEBUG(DEBUG_ERR,(__location__ " Failed to send message to remote node %u\n",
222 struct daemon_call_state {
223 struct ctdb_client *client;
225 struct ctdb_call *call;
226 struct timeval start_time;
230 complete a call from a client
232 static void daemon_call_from_client_callback(struct ctdb_call_state *state)
234 struct daemon_call_state *dstate = talloc_get_type(state->async.private_data,
235 struct daemon_call_state);
236 struct ctdb_reply_call *r;
239 struct ctdb_client *client = dstate->client;
240 struct ctdb_db_context *ctdb_db = state->ctdb_db;
242 talloc_steal(client, dstate);
243 talloc_steal(dstate, dstate->call);
245 res = ctdb_daemon_call_recv(state, dstate->call);
247 DEBUG(DEBUG_ERR, (__location__ " ctdbd_call_recv() returned error\n"));
248 if (client->ctdb->statistics.pending_calls > 0) {
249 client->ctdb->statistics.pending_calls--;
251 ctdb_latency(ctdb_db, "call_from_client_cb 1", &client->ctdb->statistics.max_call_latency, dstate->start_time);
255 length = offsetof(struct ctdb_reply_call, data) + dstate->call->reply_data.dsize;
256 r = ctdbd_allocate_pkt(client->ctdb, dstate, CTDB_REPLY_CALL,
257 length, struct ctdb_reply_call);
259 DEBUG(DEBUG_ERR, (__location__ " Failed to allocate reply_call in ctdb daemon\n"));
260 if (client->ctdb->statistics.pending_calls > 0) {
261 client->ctdb->statistics.pending_calls--;
263 ctdb_latency(ctdb_db, "call_from_client_cb 2", &client->ctdb->statistics.max_call_latency, dstate->start_time);
266 r->hdr.reqid = dstate->reqid;
267 r->datalen = dstate->call->reply_data.dsize;
268 memcpy(&r->data[0], dstate->call->reply_data.dptr, r->datalen);
270 res = daemon_queue_send(client, &r->hdr);
272 DEBUG(DEBUG_ERR, (__location__ " Failed to queue packet from daemon to client\n"));
274 ctdb_latency(ctdb_db, "call_from_client_cb 3", &client->ctdb->statistics.max_call_latency, dstate->start_time);
276 if (client->ctdb->statistics.pending_calls > 0) {
277 client->ctdb->statistics.pending_calls--;
281 struct ctdb_daemon_packet_wrap {
282 struct ctdb_context *ctdb;
287 a wrapper to catch disconnected clients
289 static void daemon_incoming_packet_wrap(void *p, struct ctdb_req_header *hdr)
291 struct ctdb_client *client;
292 struct ctdb_daemon_packet_wrap *w = talloc_get_type(p,
293 struct ctdb_daemon_packet_wrap);
295 DEBUG(DEBUG_CRIT,(__location__ " Bad packet type '%s'\n", talloc_get_name(p)));
299 client = ctdb_reqid_find(w->ctdb, w->client_id, struct ctdb_client);
300 if (client == NULL) {
301 DEBUG(DEBUG_ERR,(__location__ " Packet for disconnected client %u\n",
309 daemon_incoming_packet(client, hdr);
314 this is called when the ctdb daemon received a ctdb request call
315 from a local client over the unix domain socket
317 static void daemon_request_call_from_client(struct ctdb_client *client,
318 struct ctdb_req_call *c)
320 struct ctdb_call_state *state;
321 struct ctdb_db_context *ctdb_db;
322 struct daemon_call_state *dstate;
323 struct ctdb_call *call;
324 struct ctdb_ltdb_header header;
327 struct ctdb_context *ctdb = client->ctdb;
328 struct ctdb_daemon_packet_wrap *w;
330 ctdb->statistics.total_calls++;
331 if (client->ctdb->statistics.pending_calls > 0) {
332 ctdb->statistics.pending_calls++;
335 ctdb_db = find_ctdb_db(client->ctdb, c->db_id);
337 DEBUG(DEBUG_ERR, (__location__ " Unknown database in request. db_id==0x%08x",
339 if (client->ctdb->statistics.pending_calls > 0) {
340 ctdb->statistics.pending_calls--;
346 key.dsize = c->keylen;
348 w = talloc(ctdb, struct ctdb_daemon_packet_wrap);
349 CTDB_NO_MEMORY_VOID(ctdb, w);
352 w->client_id = client->client_id;
354 ret = ctdb_ltdb_lock_fetch_requeue(ctdb_db, key, &header,
355 (struct ctdb_req_header *)c, &data,
356 daemon_incoming_packet_wrap, w, True);
358 /* will retry later */
359 if (client->ctdb->statistics.pending_calls > 0) {
360 ctdb->statistics.pending_calls--;
368 DEBUG(DEBUG_ERR,(__location__ " Unable to fetch record\n"));
369 if (client->ctdb->statistics.pending_calls > 0) {
370 ctdb->statistics.pending_calls--;
375 dstate = talloc(client, struct daemon_call_state);
376 if (dstate == NULL) {
377 ctdb_ltdb_unlock(ctdb_db, key);
378 DEBUG(DEBUG_ERR,(__location__ " Unable to allocate dstate\n"));
379 if (client->ctdb->statistics.pending_calls > 0) {
380 ctdb->statistics.pending_calls--;
384 dstate->start_time = timeval_current();
385 dstate->client = client;
386 dstate->reqid = c->hdr.reqid;
387 talloc_steal(dstate, data.dptr);
389 call = dstate->call = talloc_zero(dstate, struct ctdb_call);
391 ctdb_ltdb_unlock(ctdb_db, key);
392 DEBUG(DEBUG_ERR,(__location__ " Unable to allocate call\n"));
393 if (client->ctdb->statistics.pending_calls > 0) {
394 ctdb->statistics.pending_calls--;
396 ctdb_latency(ctdb_db, "call_from_client 1", &ctdb->statistics.max_call_latency, dstate->start_time);
400 call->call_id = c->callid;
402 call->call_data.dptr = c->data + c->keylen;
403 call->call_data.dsize = c->calldatalen;
404 call->flags = c->flags;
406 if (header.dmaster == ctdb->pnn) {
407 state = ctdb_call_local_send(ctdb_db, call, &header, &data);
409 state = ctdb_daemon_call_send_remote(ctdb_db, call, &header);
412 ctdb_ltdb_unlock(ctdb_db, key);
415 DEBUG(DEBUG_ERR,(__location__ " Unable to setup call send\n"));
416 if (client->ctdb->statistics.pending_calls > 0) {
417 ctdb->statistics.pending_calls--;
419 ctdb_latency(ctdb_db, "call_from_client 2", &ctdb->statistics.max_call_latency, dstate->start_time);
422 talloc_steal(state, dstate);
423 talloc_steal(client, state);
425 state->async.fn = daemon_call_from_client_callback;
426 state->async.private_data = dstate;
430 static void daemon_request_control_from_client(struct ctdb_client *client,
431 struct ctdb_req_control *c);
433 /* data contains a packet from the client */
434 static void daemon_incoming_packet(void *p, struct ctdb_req_header *hdr)
436 struct ctdb_client *client = talloc_get_type(p, struct ctdb_client);
438 struct ctdb_context *ctdb = client->ctdb;
440 /* place the packet as a child of a tmp_ctx. We then use
441 talloc_free() below to free it. If any of the calls want
442 to keep it, then they will steal it somewhere else, and the
443 talloc_free() will be a no-op */
444 tmp_ctx = talloc_new(client);
445 talloc_steal(tmp_ctx, hdr);
447 if (hdr->ctdb_magic != CTDB_MAGIC) {
448 ctdb_set_error(client->ctdb, "Non CTDB packet rejected in daemon\n");
452 if (hdr->ctdb_version != CTDB_VERSION) {
453 ctdb_set_error(client->ctdb, "Bad CTDB version 0x%x rejected in daemon\n", hdr->ctdb_version);
457 switch (hdr->operation) {
459 ctdb->statistics.client.req_call++;
460 daemon_request_call_from_client(client, (struct ctdb_req_call *)hdr);
463 case CTDB_REQ_MESSAGE:
464 ctdb->statistics.client.req_message++;
465 daemon_request_message_from_client(client, (struct ctdb_req_message *)hdr);
468 case CTDB_REQ_CONTROL:
469 ctdb->statistics.client.req_control++;
470 daemon_request_control_from_client(client, (struct ctdb_req_control *)hdr);
474 DEBUG(DEBUG_CRIT,(__location__ " daemon: unrecognized operation %u\n",
479 talloc_free(tmp_ctx);
483 called when the daemon gets a incoming packet
485 static void ctdb_daemon_read_cb(uint8_t *data, size_t cnt, void *args)
487 struct ctdb_client *client = talloc_get_type(args, struct ctdb_client);
488 struct ctdb_req_header *hdr;
495 client->ctdb->statistics.client_packets_recv++;
497 if (cnt < sizeof(*hdr)) {
498 ctdb_set_error(client->ctdb, "Bad packet length %u in daemon\n",
502 hdr = (struct ctdb_req_header *)data;
503 if (cnt != hdr->length) {
504 ctdb_set_error(client->ctdb, "Bad header length %u expected %u\n in daemon",
505 (unsigned)hdr->length, (unsigned)cnt);
509 if (hdr->ctdb_magic != CTDB_MAGIC) {
510 ctdb_set_error(client->ctdb, "Non CTDB packet rejected\n");
514 if (hdr->ctdb_version != CTDB_VERSION) {
515 ctdb_set_error(client->ctdb, "Bad CTDB version 0x%x rejected in daemon\n", hdr->ctdb_version);
519 DEBUG(DEBUG_DEBUG,(__location__ " client request %u of type %u length %u from "
520 "node %u to %u\n", hdr->reqid, hdr->operation, hdr->length,
521 hdr->srcnode, hdr->destnode));
523 /* it is the responsibility of the incoming packet function to free 'data' */
524 daemon_incoming_packet(client, hdr);
527 static void ctdb_accept_client(struct event_context *ev, struct fd_event *fde,
528 uint16_t flags, void *private_data)
530 struct sockaddr_un addr;
533 struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
534 struct ctdb_client *client;
536 struct peercred_struct cr;
537 socklen_t crl = sizeof(struct peercred_struct);
540 socklen_t crl = sizeof(struct ucred);
543 memset(&addr, 0, sizeof(addr));
545 fd = accept(ctdb->daemon.sd, (struct sockaddr *)&addr, &len);
551 set_close_on_exec(fd);
553 client = talloc_zero(ctdb, struct ctdb_client);
555 if (getsockopt(fd, SOL_SOCKET, SO_PEERID, &cr, &crl) == 0) {
557 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &crl) == 0) {
559 talloc_asprintf(client, "struct ctdb_client: pid:%u", (unsigned)cr.pid);
564 client->client_id = ctdb_reqid_new(ctdb, client);
565 ctdb->statistics.num_clients++;
567 client->queue = ctdb_queue_setup(ctdb, client, fd, CTDB_DS_ALIGNMENT,
568 ctdb_daemon_read_cb, client);
570 talloc_set_destructor(client, ctdb_client_destructor);
576 create a unix domain socket and bind it
577 return a file descriptor open on the socket
579 static int ux_socket_bind(struct ctdb_context *ctdb)
581 struct sockaddr_un addr;
583 ctdb->daemon.sd = socket(AF_UNIX, SOCK_STREAM, 0);
584 if (ctdb->daemon.sd == -1) {
588 set_close_on_exec(ctdb->daemon.sd);
589 set_nonblocking(ctdb->daemon.sd);
591 memset(&addr, 0, sizeof(addr));
592 addr.sun_family = AF_UNIX;
593 strncpy(addr.sun_path, ctdb->daemon.name, sizeof(addr.sun_path));
595 if (bind(ctdb->daemon.sd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
596 DEBUG(DEBUG_CRIT,("Unable to bind on ctdb socket '%s'\n", ctdb->daemon.name));
600 if (chown(ctdb->daemon.name, geteuid(), getegid()) != 0 ||
601 chmod(ctdb->daemon.name, 0700) != 0) {
602 DEBUG(DEBUG_CRIT,("Unable to secure ctdb socket '%s', ctdb->daemon.name\n", ctdb->daemon.name));
607 if (listen(ctdb->daemon.sd, 100) != 0) {
608 DEBUG(DEBUG_CRIT,("Unable to listen on ctdb socket '%s'\n", ctdb->daemon.name));
615 close(ctdb->daemon.sd);
616 ctdb->daemon.sd = -1;
620 static void sig_child_handler(struct event_context *ev,
621 struct signal_event *se, int signum, int count,
625 // struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
630 pid = waitpid(-1, &status, WNOHANG);
632 DEBUG(DEBUG_ERR, (__location__ " waitpid() returned error. errno:%d\n", errno));
636 DEBUG(DEBUG_DEBUG, ("SIGCHLD from %d\n", (int)pid));
642 start the protocol going as a daemon
644 int ctdb_start_daemon(struct ctdb_context *ctdb, bool do_fork)
647 struct fd_event *fde;
648 const char *domain_socket_name;
649 struct signal_event *se;
651 /* get rid of any old sockets */
652 unlink(ctdb->daemon.name);
654 /* create a unix domain stream socket to listen to */
655 res = ux_socket_bind(ctdb);
657 DEBUG(DEBUG_ALERT,(__location__ " Failed to open CTDB unix domain socket\n"));
661 if (do_fork && fork()) {
665 tdb_reopen_all(False);
670 if (open("/dev/null", O_RDONLY) != 0) {
671 DEBUG(DEBUG_ALERT,(__location__ " Failed to setup stdin on /dev/null\n"));
675 block_signal(SIGPIPE);
677 if (ctdb->do_setsched) {
678 /* try to set us up as realtime */
679 ctdb_set_scheduler(ctdb);
682 /* ensure the socket is deleted on exit of the daemon */
683 domain_socket_name = talloc_strdup(talloc_autofree_context(), ctdb->daemon.name);
684 if (domain_socket_name == NULL) {
685 DEBUG(DEBUG_ALERT,(__location__ " talloc_strdup failed.\n"));
689 ctdb->ev = event_context_init(NULL);
691 ctdb_set_child_logging(ctdb);
693 /* force initial recovery for election */
694 ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE;
696 if (strcmp(ctdb->transport, "tcp") == 0) {
697 int ctdb_tcp_init(struct ctdb_context *);
698 ret = ctdb_tcp_init(ctdb);
700 #ifdef USE_INFINIBAND
701 if (strcmp(ctdb->transport, "ib") == 0) {
702 int ctdb_ibw_init(struct ctdb_context *);
703 ret = ctdb_ibw_init(ctdb);
707 DEBUG(DEBUG_ERR,("Failed to initialise transport '%s'\n", ctdb->transport));
711 if (ctdb->methods == NULL) {
712 DEBUG(DEBUG_ALERT,(__location__ " Can not initialize transport. ctdb->methods is NULL\n"));
713 ctdb_fatal(ctdb, "transport is unavailable. can not initialize.");
716 /* initialise the transport */
717 if (ctdb->methods->initialise(ctdb) != 0) {
718 ctdb_fatal(ctdb, "transport failed to initialise");
721 /* attach to any existing persistent databases */
722 if (ctdb_attach_persistent(ctdb) != 0) {
723 ctdb_fatal(ctdb, "Failed to attach to persistent databases\n");
726 /* start frozen, then let the first election sort things out */
727 if (!ctdb_blocking_freeze(ctdb)) {
728 ctdb_fatal(ctdb, "Failed to get initial freeze\n");
731 /* now start accepting clients, only can do this once frozen */
732 fde = event_add_fd(ctdb->ev, ctdb, ctdb->daemon.sd,
733 EVENT_FD_READ|EVENT_FD_AUTOCLOSE,
734 ctdb_accept_client, ctdb);
736 /* tell all other nodes we've just started up */
737 ctdb_daemon_send_control(ctdb, CTDB_BROADCAST_ALL,
738 0, CTDB_CONTROL_STARTUP, 0,
739 CTDB_CTRL_FLAG_NOREPLY,
740 tdb_null, NULL, NULL);
742 /* release any IPs we hold from previous runs of the daemon */
743 ctdb_release_all_ips(ctdb);
745 /* start the transport going */
746 ctdb_start_transport(ctdb);
748 /* set up a handler to pick up sigchld */
749 se = event_add_signal(ctdb->ev, ctdb,
754 DEBUG(DEBUG_CRIT,("Failed to set up signal handler for SIGCHLD\n"));
758 /* go into a wait loop to allow other nodes to complete */
759 event_loop_wait(ctdb->ev);
761 DEBUG(DEBUG_CRIT,("event_loop_wait() returned. this should not happen\n"));
766 allocate a packet for use in daemon<->daemon communication
768 struct ctdb_req_header *_ctdb_transport_allocate(struct ctdb_context *ctdb,
770 enum ctdb_operation operation,
771 size_t length, size_t slength,
775 struct ctdb_req_header *hdr;
777 length = MAX(length, slength);
778 size = (length+(CTDB_DS_ALIGNMENT-1)) & ~(CTDB_DS_ALIGNMENT-1);
780 if (ctdb->methods == NULL) {
781 DEBUG(DEBUG_ERR,(__location__ " Unable to allocate transport packet for operation %u of length %u. Transport is DOWN.\n",
782 operation, (unsigned)length));
786 hdr = (struct ctdb_req_header *)ctdb->methods->allocate_pkt(mem_ctx, size);
788 DEBUG(DEBUG_ERR,("Unable to allocate transport packet for operation %u of length %u\n",
789 operation, (unsigned)length));
792 talloc_set_name_const(hdr, type);
793 memset(hdr, 0, slength);
794 hdr->length = length;
795 hdr->operation = operation;
796 hdr->ctdb_magic = CTDB_MAGIC;
797 hdr->ctdb_version = CTDB_VERSION;
798 hdr->generation = ctdb->vnn_map->generation;
799 hdr->srcnode = ctdb->pnn;
804 struct daemon_control_state {
805 struct daemon_control_state *next, *prev;
806 struct ctdb_client *client;
807 struct ctdb_req_control *c;
809 struct ctdb_node *node;
813 callback when a control reply comes in
815 static void daemon_control_callback(struct ctdb_context *ctdb,
816 int32_t status, TDB_DATA data,
817 const char *errormsg,
820 struct daemon_control_state *state = talloc_get_type(private_data,
821 struct daemon_control_state);
822 struct ctdb_client *client = state->client;
823 struct ctdb_reply_control *r;
826 /* construct a message to send to the client containing the data */
827 len = offsetof(struct ctdb_reply_control, data) + data.dsize;
829 len += strlen(errormsg);
831 r = ctdbd_allocate_pkt(ctdb, state, CTDB_REPLY_CONTROL, len,
832 struct ctdb_reply_control);
833 CTDB_NO_MEMORY_VOID(ctdb, r);
835 r->hdr.reqid = state->reqid;
837 r->datalen = data.dsize;
839 memcpy(&r->data[0], data.dptr, data.dsize);
841 r->errorlen = strlen(errormsg);
842 memcpy(&r->data[r->datalen], errormsg, r->errorlen);
845 daemon_queue_send(client, &r->hdr);
851 fail all pending controls to a disconnected node
853 void ctdb_daemon_cancel_controls(struct ctdb_context *ctdb, struct ctdb_node *node)
855 struct daemon_control_state *state;
856 while ((state = node->pending_controls)) {
857 DLIST_REMOVE(node->pending_controls, state);
858 daemon_control_callback(ctdb, (uint32_t)-1, tdb_null,
859 "node is disconnected", state);
864 destroy a daemon_control_state
866 static int daemon_control_destructor(struct daemon_control_state *state)
869 DLIST_REMOVE(state->node->pending_controls, state);
875 this is called when the ctdb daemon received a ctdb request control
876 from a local client over the unix domain socket
878 static void daemon_request_control_from_client(struct ctdb_client *client,
879 struct ctdb_req_control *c)
883 struct daemon_control_state *state;
884 TALLOC_CTX *tmp_ctx = talloc_new(client);
886 if (c->hdr.destnode == CTDB_CURRENT_NODE) {
887 c->hdr.destnode = client->ctdb->pnn;
890 state = talloc(client, struct daemon_control_state);
891 CTDB_NO_MEMORY_VOID(client->ctdb, state);
893 state->client = client;
894 state->c = talloc_steal(state, c);
895 state->reqid = c->hdr.reqid;
896 if (ctdb_validate_pnn(client->ctdb, c->hdr.destnode)) {
897 state->node = client->ctdb->nodes[c->hdr.destnode];
898 DLIST_ADD(state->node->pending_controls, state);
903 talloc_set_destructor(state, daemon_control_destructor);
905 if (c->flags & CTDB_CTRL_FLAG_NOREPLY) {
906 talloc_steal(tmp_ctx, state);
909 data.dptr = &c->data[0];
910 data.dsize = c->datalen;
911 res = ctdb_daemon_send_control(client->ctdb, c->hdr.destnode,
912 c->srvid, c->opcode, client->client_id,
914 data, daemon_control_callback,
917 DEBUG(DEBUG_ERR,(__location__ " Failed to send control to remote node %u\n",
921 talloc_free(tmp_ctx);
925 register a call function
927 int ctdb_daemon_set_call(struct ctdb_context *ctdb, uint32_t db_id,
928 ctdb_fn_t fn, int id)
930 struct ctdb_registered_call *call;
931 struct ctdb_db_context *ctdb_db;
933 ctdb_db = find_ctdb_db(ctdb, db_id);
934 if (ctdb_db == NULL) {
938 call = talloc(ctdb_db, struct ctdb_registered_call);
942 DLIST_ADD(ctdb_db->calls, call);
949 this local messaging handler is ugly, but is needed to prevent
950 recursion in ctdb_send_message() when the destination node is the
951 same as the source node
953 struct ctdb_local_message {
954 struct ctdb_context *ctdb;
959 static void ctdb_local_message_trigger(struct event_context *ev, struct timed_event *te,
960 struct timeval t, void *private_data)
962 struct ctdb_local_message *m = talloc_get_type(private_data,
963 struct ctdb_local_message);
966 res = ctdb_dispatch_message(m->ctdb, m->srvid, m->data);
968 DEBUG(DEBUG_ERR, (__location__ " Failed to dispatch message for srvid=%llu\n",
969 (unsigned long long)m->srvid));
974 static int ctdb_local_message(struct ctdb_context *ctdb, uint64_t srvid, TDB_DATA data)
976 struct ctdb_local_message *m;
977 m = talloc(ctdb, struct ctdb_local_message);
978 CTDB_NO_MEMORY(ctdb, m);
983 m->data.dptr = talloc_memdup(m, m->data.dptr, m->data.dsize);
984 if (m->data.dptr == NULL) {
989 /* this needs to be done as an event to prevent recursion */
990 event_add_timed(ctdb->ev, m, timeval_zero(), ctdb_local_message_trigger, m);
997 int ctdb_daemon_send_message(struct ctdb_context *ctdb, uint32_t pnn,
998 uint64_t srvid, TDB_DATA data)
1000 struct ctdb_req_message *r;
1003 /* see if this is a message to ourselves */
1004 if (pnn == ctdb->pnn) {
1005 return ctdb_local_message(ctdb, srvid, data);
1008 len = offsetof(struct ctdb_req_message, data) + data.dsize;
1009 r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_MESSAGE, len,
1010 struct ctdb_req_message);
1011 CTDB_NO_MEMORY(ctdb, r);
1013 r->hdr.destnode = pnn;
1015 r->datalen = data.dsize;
1016 memcpy(&r->data[0], data.dptr, data.dsize);
1018 ctdb_queue_packet(ctdb, &r->hdr);