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 handler for when a node changes its flags
37 static void flag_change_handler(struct ctdb_context *ctdb, uint64_t srvid,
38 TDB_DATA data, void *private_data)
40 struct ctdb_node_flag_change *c = (struct ctdb_node_flag_change *)data.dptr;
42 if (data.dsize != sizeof(*c) || !ctdb_validate_pnn(ctdb, c->pnn)) {
43 DEBUG(DEBUG_CRIT,(__location__ "Invalid data in ctdb_node_flag_change\n"));
47 if (!ctdb_validate_pnn(ctdb, c->pnn)) {
48 DEBUG(DEBUG_CRIT,("Bad pnn %u in flag_change_handler\n", c->pnn));
52 /* don't get the disconnected flag from the other node */
53 ctdb->nodes[c->pnn]->flags =
54 (ctdb->nodes[c->pnn]->flags&NODE_FLAGS_DISCONNECTED)
55 | (c->new_flags & ~NODE_FLAGS_DISCONNECTED);
56 DEBUG(DEBUG_INFO,("Node flags for node %u are now 0x%x\n", c->pnn, ctdb->nodes[c->pnn]->flags));
58 /* make sure we don't hold any IPs when we shouldn't */
59 if (c->pnn == ctdb->pnn &&
60 (ctdb->nodes[c->pnn]->flags & (NODE_FLAGS_INACTIVE|NODE_FLAGS_BANNED))) {
61 ctdb_release_all_ips(ctdb);
65 static void print_exit_message(void)
67 DEBUG(DEBUG_NOTICE,("CTDB daemon shutting down\n"));
71 /* called when the "startup" event script has finished */
72 static void ctdb_start_transport(struct ctdb_context *ctdb)
74 if (ctdb->methods == NULL) {
75 DEBUG(DEBUG_ALERT,(__location__ " startup event finished but transport is DOWN.\n"));
76 ctdb_fatal(ctdb, "transport is not initialized but startup completed");
79 /* start the transport running */
80 if (ctdb->methods->start(ctdb) != 0) {
81 DEBUG(DEBUG_ALERT,("transport failed to start!\n"));
82 ctdb_fatal(ctdb, "transport failed to start");
85 /* start the recovery daemon process */
86 if (ctdb_start_recoverd(ctdb) != 0) {
87 DEBUG(DEBUG_ALERT,("Failed to start recovery daemon\n"));
91 /* Make sure we log something when the daemon terminates */
92 atexit(print_exit_message);
94 /* a handler for when nodes are disabled/enabled */
95 ctdb_register_message_handler(ctdb, ctdb, CTDB_SRVID_NODE_FLAGS_CHANGED,
96 flag_change_handler, NULL);
98 /* start monitoring for connected/disconnected nodes */
99 ctdb_start_keepalive(ctdb);
101 /* start monitoring for node health */
102 ctdb_start_monitoring(ctdb);
104 /* start periodic update of tcp tickle lists */
105 ctdb_start_tcp_tickle_update(ctdb);
108 static void block_signal(int signum)
110 struct sigaction act;
112 memset(&act, 0, sizeof(act));
114 act.sa_handler = SIG_IGN;
115 sigemptyset(&act.sa_mask);
116 sigaddset(&act.sa_mask, signum);
117 sigaction(signum, &act, NULL);
122 send a packet to a client
124 static int daemon_queue_send(struct ctdb_client *client, struct ctdb_req_header *hdr)
126 client->ctdb->statistics.client_packets_sent++;
127 return ctdb_queue_send(client->queue, (uint8_t *)hdr, hdr->length);
131 message handler for when we are in daemon mode. This redirects the message
134 static void daemon_message_handler(struct ctdb_context *ctdb, uint64_t srvid,
135 TDB_DATA data, void *private_data)
137 struct ctdb_client *client = talloc_get_type(private_data, struct ctdb_client);
138 struct ctdb_req_message *r;
141 /* construct a message to send to the client containing the data */
142 len = offsetof(struct ctdb_req_message, data) + data.dsize;
143 r = ctdbd_allocate_pkt(ctdb, ctdb, CTDB_REQ_MESSAGE,
144 len, struct ctdb_req_message);
145 CTDB_NO_MEMORY_VOID(ctdb, r);
147 talloc_set_name_const(r, "req_message packet");
150 r->datalen = data.dsize;
151 memcpy(&r->data[0], data.dptr, data.dsize);
153 daemon_queue_send(client, &r->hdr);
160 this is called when the ctdb daemon received a ctdb request to
161 set the srvid from the client
163 int daemon_register_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);
167 if (client == NULL) {
168 DEBUG(DEBUG_ERR,("Bad client_id in daemon_request_register_message_handler\n"));
171 res = ctdb_register_message_handler(ctdb, client, srvid, daemon_message_handler, client);
173 DEBUG(DEBUG_ERR,(__location__ " Failed to register handler %llu in daemon\n",
174 (unsigned long long)srvid));
176 DEBUG(DEBUG_INFO,(__location__ " Registered message handler for srvid=%llu\n",
177 (unsigned long long)srvid));
180 /* this is a hack for Samba - we now know the pid of the Samba client */
181 if ((srvid & 0xFFFFFFFF) == srvid &&
182 kill(srvid, 0) == 0) {
184 DEBUG(DEBUG_INFO,(__location__ " Registered PID %u for client %u\n",
185 (unsigned)client->pid, client_id));
191 this is called when the ctdb daemon received a ctdb request to
192 remove a srvid from the client
194 int daemon_deregister_message_handler(struct ctdb_context *ctdb, uint32_t client_id, uint64_t srvid)
196 struct ctdb_client *client = ctdb_reqid_find(ctdb, client_id, struct ctdb_client);
197 if (client == NULL) {
198 DEBUG(DEBUG_ERR,("Bad client_id in daemon_request_deregister_message_handler\n"));
201 return ctdb_deregister_message_handler(ctdb, srvid, client);
206 destroy a ctdb_client
208 static int ctdb_client_destructor(struct ctdb_client *client)
210 ctdb_takeover_client_destructor_hook(client);
211 ctdb_reqid_remove(client->ctdb, client->client_id);
212 client->ctdb->statistics.num_clients--;
218 this is called when the ctdb daemon received a ctdb request message
219 from a local client over the unix domain socket
221 static void daemon_request_message_from_client(struct ctdb_client *client,
222 struct ctdb_req_message *c)
227 /* maybe the message is for another client on this node */
228 if (ctdb_get_pnn(client->ctdb)==c->hdr.destnode) {
229 ctdb_request_message(client->ctdb, (struct ctdb_req_header *)c);
233 /* its for a remote node */
234 data.dptr = &c->data[0];
235 data.dsize = c->datalen;
236 res = ctdb_daemon_send_message(client->ctdb, c->hdr.destnode,
239 DEBUG(DEBUG_ERR,(__location__ " Failed to send message to remote node %u\n",
245 struct daemon_call_state {
246 struct ctdb_client *client;
248 struct ctdb_call *call;
249 struct timeval start_time;
253 complete a call from a client
255 static void daemon_call_from_client_callback(struct ctdb_call_state *state)
257 struct daemon_call_state *dstate = talloc_get_type(state->async.private_data,
258 struct daemon_call_state);
259 struct ctdb_reply_call *r;
262 struct ctdb_client *client = dstate->client;
264 talloc_steal(client, dstate);
265 talloc_steal(dstate, dstate->call);
267 res = ctdb_daemon_call_recv(state, dstate->call);
269 DEBUG(DEBUG_ERR, (__location__ " ctdbd_call_recv() returned error\n"));
270 client->ctdb->statistics.pending_calls--;
271 ctdb_latency(&client->ctdb->statistics.max_call_latency, dstate->start_time);
275 length = offsetof(struct ctdb_reply_call, data) + dstate->call->reply_data.dsize;
276 r = ctdbd_allocate_pkt(client->ctdb, dstate, CTDB_REPLY_CALL,
277 length, struct ctdb_reply_call);
279 DEBUG(DEBUG_ERR, (__location__ " Failed to allocate reply_call in ctdb daemon\n"));
280 client->ctdb->statistics.pending_calls--;
281 ctdb_latency(&client->ctdb->statistics.max_call_latency, dstate->start_time);
284 r->hdr.reqid = dstate->reqid;
285 r->datalen = dstate->call->reply_data.dsize;
286 memcpy(&r->data[0], dstate->call->reply_data.dptr, r->datalen);
288 res = daemon_queue_send(client, &r->hdr);
290 DEBUG(DEBUG_ERR, (__location__ " Failed to queue packet from daemon to client\n"));
292 ctdb_latency(&client->ctdb->statistics.max_call_latency, dstate->start_time);
294 client->ctdb->statistics.pending_calls--;
297 struct ctdb_daemon_packet_wrap {
298 struct ctdb_context *ctdb;
303 a wrapper to catch disconnected clients
305 static void daemon_incoming_packet_wrap(void *p, struct ctdb_req_header *hdr)
307 struct ctdb_client *client;
308 struct ctdb_daemon_packet_wrap *w = talloc_get_type(p,
309 struct ctdb_daemon_packet_wrap);
311 DEBUG(DEBUG_CRIT,(__location__ " Bad packet type '%s'\n", talloc_get_name(p)));
315 client = ctdb_reqid_find(w->ctdb, w->client_id, struct ctdb_client);
316 if (client == NULL) {
317 DEBUG(DEBUG_ERR,(__location__ " Packet for disconnected client %u\n",
325 daemon_incoming_packet(client, hdr);
330 this is called when the ctdb daemon received a ctdb request call
331 from a local client over the unix domain socket
333 static void daemon_request_call_from_client(struct ctdb_client *client,
334 struct ctdb_req_call *c)
336 struct ctdb_call_state *state;
337 struct ctdb_db_context *ctdb_db;
338 struct daemon_call_state *dstate;
339 struct ctdb_call *call;
340 struct ctdb_ltdb_header header;
343 struct ctdb_context *ctdb = client->ctdb;
344 struct ctdb_daemon_packet_wrap *w;
346 ctdb->statistics.total_calls++;
347 ctdb->statistics.pending_calls++;
349 ctdb_db = find_ctdb_db(client->ctdb, c->db_id);
351 DEBUG(DEBUG_ERR, (__location__ " Unknown database in request. db_id==0x%08x",
353 ctdb->statistics.pending_calls--;
358 key.dsize = c->keylen;
360 w = talloc(ctdb, struct ctdb_daemon_packet_wrap);
361 CTDB_NO_MEMORY_VOID(ctdb, w);
364 w->client_id = client->client_id;
366 ret = ctdb_ltdb_lock_fetch_requeue(ctdb_db, key, &header,
367 (struct ctdb_req_header *)c, &data,
368 daemon_incoming_packet_wrap, w, True);
370 /* will retry later */
371 ctdb->statistics.pending_calls--;
378 DEBUG(DEBUG_ERR,(__location__ " Unable to fetch record\n"));
379 ctdb->statistics.pending_calls--;
383 dstate = talloc(client, struct daemon_call_state);
384 if (dstate == NULL) {
385 ctdb_ltdb_unlock(ctdb_db, key);
386 DEBUG(DEBUG_ERR,(__location__ " Unable to allocate dstate\n"));
387 ctdb->statistics.pending_calls--;
390 dstate->start_time = timeval_current();
391 dstate->client = client;
392 dstate->reqid = c->hdr.reqid;
393 talloc_steal(dstate, data.dptr);
395 call = dstate->call = talloc_zero(dstate, struct ctdb_call);
397 ctdb_ltdb_unlock(ctdb_db, key);
398 DEBUG(DEBUG_ERR,(__location__ " Unable to allocate call\n"));
399 ctdb->statistics.pending_calls--;
400 ctdb_latency(&ctdb->statistics.max_call_latency, dstate->start_time);
404 call->call_id = c->callid;
406 call->call_data.dptr = c->data + c->keylen;
407 call->call_data.dsize = c->calldatalen;
408 call->flags = c->flags;
410 if (header.dmaster == ctdb->pnn) {
411 state = ctdb_call_local_send(ctdb_db, call, &header, &data);
413 state = ctdb_daemon_call_send_remote(ctdb_db, call, &header);
416 ctdb_ltdb_unlock(ctdb_db, key);
419 DEBUG(DEBUG_ERR,(__location__ " Unable to setup call send\n"));
420 ctdb->statistics.pending_calls--;
421 ctdb_latency(&ctdb->statistics.max_call_latency, dstate->start_time);
424 talloc_steal(state, dstate);
425 talloc_steal(client, state);
427 state->async.fn = daemon_call_from_client_callback;
428 state->async.private_data = dstate;
432 static void daemon_request_control_from_client(struct ctdb_client *client,
433 struct ctdb_req_control *c);
435 /* data contains a packet from the client */
436 static void daemon_incoming_packet(void *p, struct ctdb_req_header *hdr)
438 struct ctdb_client *client = talloc_get_type(p, struct ctdb_client);
440 struct ctdb_context *ctdb = client->ctdb;
442 /* place the packet as a child of a tmp_ctx. We then use
443 talloc_free() below to free it. If any of the calls want
444 to keep it, then they will steal it somewhere else, and the
445 talloc_free() will be a no-op */
446 tmp_ctx = talloc_new(client);
447 talloc_steal(tmp_ctx, hdr);
449 if (hdr->ctdb_magic != CTDB_MAGIC) {
450 ctdb_set_error(client->ctdb, "Non CTDB packet rejected in daemon\n");
454 if (hdr->ctdb_version != CTDB_VERSION) {
455 ctdb_set_error(client->ctdb, "Bad CTDB version 0x%x rejected in daemon\n", hdr->ctdb_version);
459 switch (hdr->operation) {
461 ctdb->statistics.client.req_call++;
462 daemon_request_call_from_client(client, (struct ctdb_req_call *)hdr);
465 case CTDB_REQ_MESSAGE:
466 ctdb->statistics.client.req_message++;
467 daemon_request_message_from_client(client, (struct ctdb_req_message *)hdr);
470 case CTDB_REQ_CONTROL:
471 ctdb->statistics.client.req_control++;
472 daemon_request_control_from_client(client, (struct ctdb_req_control *)hdr);
476 DEBUG(DEBUG_CRIT,(__location__ " daemon: unrecognized operation %u\n",
481 talloc_free(tmp_ctx);
485 called when the daemon gets a incoming packet
487 static void ctdb_daemon_read_cb(uint8_t *data, size_t cnt, void *args)
489 struct ctdb_client *client = talloc_get_type(args, struct ctdb_client);
490 struct ctdb_req_header *hdr;
497 client->ctdb->statistics.client_packets_recv++;
499 if (cnt < sizeof(*hdr)) {
500 ctdb_set_error(client->ctdb, "Bad packet length %u in daemon\n",
504 hdr = (struct ctdb_req_header *)data;
505 if (cnt != hdr->length) {
506 ctdb_set_error(client->ctdb, "Bad header length %u expected %u\n in daemon",
507 (unsigned)hdr->length, (unsigned)cnt);
511 if (hdr->ctdb_magic != CTDB_MAGIC) {
512 ctdb_set_error(client->ctdb, "Non CTDB packet rejected\n");
516 if (hdr->ctdb_version != CTDB_VERSION) {
517 ctdb_set_error(client->ctdb, "Bad CTDB version 0x%x rejected in daemon\n", hdr->ctdb_version);
521 DEBUG(DEBUG_DEBUG,(__location__ " client request %u of type %u length %u from "
522 "node %u to %u\n", hdr->reqid, hdr->operation, hdr->length,
523 hdr->srcnode, hdr->destnode));
525 /* it is the responsibility of the incoming packet function to free 'data' */
526 daemon_incoming_packet(client, hdr);
529 static void ctdb_accept_client(struct event_context *ev, struct fd_event *fde,
530 uint16_t flags, void *private_data)
532 struct sockaddr_in addr;
535 struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
536 struct ctdb_client *client;
538 struct peercred_struct cr;
539 socklen_t crl = sizeof(struct peercred_struct);
542 socklen_t crl = sizeof(struct ucred);
545 memset(&addr, 0, sizeof(addr));
547 fd = accept(ctdb->daemon.sd, (struct sockaddr *)&addr, &len);
553 set_close_on_exec(fd);
555 client = talloc_zero(ctdb, struct ctdb_client);
557 if (getsockopt(fd, SOL_SOCKET, SO_PEERID, &cr, &crl) == 0) {
559 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &crl) == 0) {
561 talloc_asprintf(client, "struct ctdb_client: pid:%u", (unsigned)cr.pid);
566 client->client_id = ctdb_reqid_new(ctdb, client);
567 ctdb->statistics.num_clients++;
569 client->queue = ctdb_queue_setup(ctdb, client, fd, CTDB_DS_ALIGNMENT,
570 ctdb_daemon_read_cb, client);
572 talloc_set_destructor(client, ctdb_client_destructor);
578 create a unix domain socket and bind it
579 return a file descriptor open on the socket
581 static int ux_socket_bind(struct ctdb_context *ctdb)
583 struct sockaddr_un addr;
585 ctdb->daemon.sd = socket(AF_UNIX, SOCK_STREAM, 0);
586 if (ctdb->daemon.sd == -1) {
590 set_close_on_exec(ctdb->daemon.sd);
591 set_nonblocking(ctdb->daemon.sd);
593 memset(&addr, 0, sizeof(addr));
594 addr.sun_family = AF_UNIX;
595 strncpy(addr.sun_path, ctdb->daemon.name, sizeof(addr.sun_path));
597 if (bind(ctdb->daemon.sd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
598 DEBUG(DEBUG_CRIT,("Unable to bind on ctdb socket '%s'\n", ctdb->daemon.name));
602 if (chown(ctdb->daemon.name, geteuid(), getegid()) != 0 ||
603 chmod(ctdb->daemon.name, 0700) != 0) {
604 DEBUG(DEBUG_CRIT,("Unable to secure ctdb socket '%s', ctdb->daemon.name\n", ctdb->daemon.name));
609 if (listen(ctdb->daemon.sd, 10) != 0) {
610 DEBUG(DEBUG_CRIT,("Unable to listen on ctdb socket '%s'\n", ctdb->daemon.name));
617 close(ctdb->daemon.sd);
618 ctdb->daemon.sd = -1;
623 delete the socket on exit - called on destruction of autofree context
625 static int unlink_destructor(const char *name)
631 static void sig_child_handler(struct event_context *ev,
632 struct signal_event *se, int signum, int count,
636 // struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
641 pid = waitpid(-1, &status, WNOHANG);
643 DEBUG(DEBUG_ERR, (__location__ " waitpid() returned error. errno:%d\n", errno));
647 DEBUG(DEBUG_DEBUG, ("SIGCHLD from %d\n", (int)pid));
653 start the protocol going as a daemon
655 int ctdb_start_daemon(struct ctdb_context *ctdb, bool do_fork)
658 struct fd_event *fde;
659 const char *domain_socket_name;
660 struct signal_event *se;
662 /* get rid of any old sockets */
663 unlink(ctdb->daemon.name);
665 /* create a unix domain stream socket to listen to */
666 res = ux_socket_bind(ctdb);
668 DEBUG(DEBUG_ALERT,(__location__ " Failed to open CTDB unix domain socket\n"));
672 if (do_fork && fork()) {
676 tdb_reopen_all(False);
681 if (open("/dev/null", O_RDONLY) != 0) {
682 DEBUG(DEBUG_ALERT,(__location__ " Failed to setup stdin on /dev/null\n"));
686 block_signal(SIGPIPE);
688 if (ctdb->do_setsched) {
689 /* try to set us up as realtime */
690 ctdb_set_scheduler(ctdb);
693 /* ensure the socket is deleted on exit of the daemon */
694 domain_socket_name = talloc_strdup(talloc_autofree_context(), ctdb->daemon.name);
695 talloc_set_destructor(domain_socket_name, unlink_destructor);
697 ctdb->ev = event_context_init(NULL);
699 ctdb_set_child_logging(ctdb);
701 /* force initial recovery for election */
702 ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE;
704 if (strcmp(ctdb->transport, "tcp") == 0) {
705 int ctdb_tcp_init(struct ctdb_context *);
706 ret = ctdb_tcp_init(ctdb);
708 #ifdef USE_INFINIBAND
709 if (strcmp(ctdb->transport, "ib") == 0) {
710 int ctdb_ibw_init(struct ctdb_context *);
711 ret = ctdb_ibw_init(ctdb);
715 DEBUG(DEBUG_ERR,("Failed to initialise transport '%s'\n", ctdb->transport));
719 if (ctdb->methods == NULL) {
720 DEBUG(DEBUG_ALERT,(__location__ " Can not initialize transport. ctdb->methods is NULL\n"));
721 ctdb_fatal(ctdb, "transport is unavailable. can not initialize.");
724 /* initialise the transport */
725 if (ctdb->methods->initialise(ctdb) != 0) {
726 ctdb_fatal(ctdb, "transport failed to initialise");
729 /* attach to any existing persistent databases */
730 if (ctdb_attach_persistent(ctdb) != 0) {
731 ctdb_fatal(ctdb, "Failed to attach to persistent databases\n");
734 /* start frozen, then let the first election sort things out */
735 if (!ctdb_blocking_freeze(ctdb)) {
736 ctdb_fatal(ctdb, "Failed to get initial freeze\n");
739 /* now start accepting clients, only can do this once frozen */
740 fde = event_add_fd(ctdb->ev, ctdb, ctdb->daemon.sd,
741 EVENT_FD_READ|EVENT_FD_AUTOCLOSE,
742 ctdb_accept_client, ctdb);
744 /* tell all other nodes we've just started up */
745 ctdb_daemon_send_control(ctdb, CTDB_BROADCAST_ALL,
746 0, CTDB_CONTROL_STARTUP, 0,
747 CTDB_CTRL_FLAG_NOREPLY,
748 tdb_null, NULL, NULL);
750 /* release any IPs we hold from previous runs of the daemon */
751 ctdb_release_all_ips(ctdb);
753 /* start the transport going */
754 ctdb_start_transport(ctdb);
756 /* set up a handler to pick up sigchld */
757 se = event_add_signal(ctdb->ev, ctdb,
762 DEBUG(DEBUG_CRIT,("Failed to set up signal handler for SIGCHLD\n"));
766 /* go into a wait loop to allow other nodes to complete */
767 event_loop_wait(ctdb->ev);
769 DEBUG(DEBUG_CRIT,("event_loop_wait() returned. this should not happen\n"));
774 allocate a packet for use in daemon<->daemon communication
776 struct ctdb_req_header *_ctdb_transport_allocate(struct ctdb_context *ctdb,
778 enum ctdb_operation operation,
779 size_t length, size_t slength,
783 struct ctdb_req_header *hdr;
785 length = MAX(length, slength);
786 size = (length+(CTDB_DS_ALIGNMENT-1)) & ~(CTDB_DS_ALIGNMENT-1);
788 if (ctdb->methods == NULL) {
789 DEBUG(DEBUG_ERR,(__location__ " Unable to allocate transport packet for operation %u of length %u. Transport is DOWN.\n",
790 operation, (unsigned)length));
794 hdr = (struct ctdb_req_header *)ctdb->methods->allocate_pkt(mem_ctx, size);
796 DEBUG(DEBUG_ERR,("Unable to allocate transport packet for operation %u of length %u\n",
797 operation, (unsigned)length));
800 talloc_set_name_const(hdr, type);
801 memset(hdr, 0, slength);
802 hdr->length = length;
803 hdr->operation = operation;
804 hdr->ctdb_magic = CTDB_MAGIC;
805 hdr->ctdb_version = CTDB_VERSION;
806 hdr->generation = ctdb->vnn_map->generation;
807 hdr->srcnode = ctdb->pnn;
812 struct daemon_control_state {
813 struct daemon_control_state *next, *prev;
814 struct ctdb_client *client;
815 struct ctdb_req_control *c;
817 struct ctdb_node *node;
821 callback when a control reply comes in
823 static void daemon_control_callback(struct ctdb_context *ctdb,
824 int32_t status, TDB_DATA data,
825 const char *errormsg,
828 struct daemon_control_state *state = talloc_get_type(private_data,
829 struct daemon_control_state);
830 struct ctdb_client *client = state->client;
831 struct ctdb_reply_control *r;
834 /* construct a message to send to the client containing the data */
835 len = offsetof(struct ctdb_reply_control, data) + data.dsize;
837 len += strlen(errormsg);
839 r = ctdbd_allocate_pkt(ctdb, state, CTDB_REPLY_CONTROL, len,
840 struct ctdb_reply_control);
841 CTDB_NO_MEMORY_VOID(ctdb, r);
843 r->hdr.reqid = state->reqid;
845 r->datalen = data.dsize;
847 memcpy(&r->data[0], data.dptr, data.dsize);
849 r->errorlen = strlen(errormsg);
850 memcpy(&r->data[r->datalen], errormsg, r->errorlen);
853 daemon_queue_send(client, &r->hdr);
859 fail all pending controls to a disconnected node
861 void ctdb_daemon_cancel_controls(struct ctdb_context *ctdb, struct ctdb_node *node)
863 struct daemon_control_state *state;
864 while ((state = node->pending_controls)) {
865 DLIST_REMOVE(node->pending_controls, state);
866 daemon_control_callback(ctdb, (uint32_t)-1, tdb_null,
867 "node is disconnected", state);
872 destroy a daemon_control_state
874 static int daemon_control_destructor(struct daemon_control_state *state)
877 DLIST_REMOVE(state->node->pending_controls, state);
883 this is called when the ctdb daemon received a ctdb request control
884 from a local client over the unix domain socket
886 static void daemon_request_control_from_client(struct ctdb_client *client,
887 struct ctdb_req_control *c)
891 struct daemon_control_state *state;
892 TALLOC_CTX *tmp_ctx = talloc_new(client);
894 if (c->hdr.destnode == CTDB_CURRENT_NODE) {
895 c->hdr.destnode = client->ctdb->pnn;
898 state = talloc(client, struct daemon_control_state);
899 CTDB_NO_MEMORY_VOID(client->ctdb, state);
901 state->client = client;
902 state->c = talloc_steal(state, c);
903 state->reqid = c->hdr.reqid;
904 if (ctdb_validate_pnn(client->ctdb, c->hdr.destnode)) {
905 state->node = client->ctdb->nodes[c->hdr.destnode];
906 DLIST_ADD(state->node->pending_controls, state);
911 talloc_set_destructor(state, daemon_control_destructor);
913 if (c->flags & CTDB_CTRL_FLAG_NOREPLY) {
914 talloc_steal(tmp_ctx, state);
917 data.dptr = &c->data[0];
918 data.dsize = c->datalen;
919 res = ctdb_daemon_send_control(client->ctdb, c->hdr.destnode,
920 c->srvid, c->opcode, client->client_id,
922 data, daemon_control_callback,
925 DEBUG(DEBUG_ERR,(__location__ " Failed to send control to remote node %u\n",
929 talloc_free(tmp_ctx);
933 register a call function
935 int ctdb_daemon_set_call(struct ctdb_context *ctdb, uint32_t db_id,
936 ctdb_fn_t fn, int id)
938 struct ctdb_registered_call *call;
939 struct ctdb_db_context *ctdb_db;
941 ctdb_db = find_ctdb_db(ctdb, db_id);
942 if (ctdb_db == NULL) {
946 call = talloc(ctdb_db, struct ctdb_registered_call);
950 DLIST_ADD(ctdb_db->calls, call);
957 this local messaging handler is ugly, but is needed to prevent
958 recursion in ctdb_send_message() when the destination node is the
959 same as the source node
961 struct ctdb_local_message {
962 struct ctdb_context *ctdb;
967 static void ctdb_local_message_trigger(struct event_context *ev, struct timed_event *te,
968 struct timeval t, void *private_data)
970 struct ctdb_local_message *m = talloc_get_type(private_data,
971 struct ctdb_local_message);
974 res = ctdb_dispatch_message(m->ctdb, m->srvid, m->data);
976 DEBUG(DEBUG_ERR, (__location__ " Failed to dispatch message for srvid=%llu\n",
977 (unsigned long long)m->srvid));
982 static int ctdb_local_message(struct ctdb_context *ctdb, uint64_t srvid, TDB_DATA data)
984 struct ctdb_local_message *m;
985 m = talloc(ctdb, struct ctdb_local_message);
986 CTDB_NO_MEMORY(ctdb, m);
991 m->data.dptr = talloc_memdup(m, m->data.dptr, m->data.dsize);
992 if (m->data.dptr == NULL) {
997 /* this needs to be done as an event to prevent recursion */
998 event_add_timed(ctdb->ev, m, timeval_zero(), ctdb_local_message_trigger, m);
1005 int ctdb_daemon_send_message(struct ctdb_context *ctdb, uint32_t pnn,
1006 uint64_t srvid, TDB_DATA data)
1008 struct ctdb_req_message *r;
1011 /* see if this is a message to ourselves */
1012 if (pnn == ctdb->pnn) {
1013 return ctdb_local_message(ctdb, srvid, data);
1016 len = offsetof(struct ctdb_req_message, data) + data.dsize;
1017 r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_MESSAGE, len,
1018 struct ctdb_req_message);
1019 CTDB_NO_MEMORY(ctdb, r);
1021 r->hdr.destnode = pnn;
1023 r->datalen = data.dsize;
1024 memcpy(&r->data[0], data.dptr, data.dsize);
1026 ctdb_queue_packet(ctdb, &r->hdr);