diff options
Diffstat (limited to 'source4/cluster/ctdb/server/ctdb_daemon.c')
| -rw-r--r-- | source4/cluster/ctdb/server/ctdb_daemon.c | 927 |
1 files changed, 927 insertions, 0 deletions
diff --git a/source4/cluster/ctdb/server/ctdb_daemon.c b/source4/cluster/ctdb/server/ctdb_daemon.c new file mode 100644 index 0000000000..2577970075 --- /dev/null +++ b/source4/cluster/ctdb/server/ctdb_daemon.c @@ -0,0 +1,927 @@ +/* + ctdb daemon code + + Copyright (C) Andrew Tridgell 2006 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" +#include "db_wrap.h" +#include "lib/tdb/include/tdb.h" +#include "lib/events/events.h" +#include "lib/util/dlinklist.h" +#include "system/network.h" +#include "system/filesys.h" +#include "system/wait.h" +#include "../include/ctdb.h" +#include "../include/ctdb_private.h" + +static void daemon_incoming_packet(void *, struct ctdb_req_header *); + +/* + handler for when a node changes its flags +*/ +static void flag_change_handler(struct ctdb_context *ctdb, uint64_t srvid, + TDB_DATA data, void *private_data) +{ + struct ctdb_node_flag_change *c = (struct ctdb_node_flag_change *)data.dptr; + + if (data.dsize != sizeof(*c) || !ctdb_validate_vnn(ctdb, c->vnn)) { + DEBUG(0,(__location__ "Invalid data in ctdb_node_flag_change\n")); + return; + } + + if (!ctdb_validate_vnn(ctdb, c->vnn)) { + DEBUG(0,("Bad vnn %u in flag_change_handler\n", c->vnn)); + return; + } + + /* don't get the disconnected flag from the other node */ + ctdb->nodes[c->vnn]->flags = + (ctdb->nodes[c->vnn]->flags&NODE_FLAGS_DISCONNECTED) + | (c->flags & ~NODE_FLAGS_DISCONNECTED); + DEBUG(2,("Node flags for node %u are now 0x%x\n", c->vnn, ctdb->nodes[c->vnn]->flags)); + + /* make sure we don't hold any IPs when we shouldn't */ + if (c->vnn == ctdb->vnn && + (ctdb->nodes[c->vnn]->flags & (NODE_FLAGS_INACTIVE|NODE_FLAGS_BANNED))) { + ctdb_release_all_ips(ctdb); + } +} + +/* called when the "startup" event script has finished */ +static void ctdb_start_transport(struct ctdb_context *ctdb, int status, void *p) +{ + if (status != 0) { + DEBUG(0,("startup event failed!\n")); + ctdb_fatal(ctdb, "startup event script failed"); + } + + /* start the transport running */ + if (ctdb->methods->start(ctdb) != 0) { + DEBUG(0,("transport failed to start!\n")); + ctdb_fatal(ctdb, "transport failed to start"); + } + + /* start the recovery daemon process */ + if (ctdb_start_recoverd(ctdb) != 0) { + DEBUG(0,("Failed to start recovery daemon\n")); + exit(11); + } + + /* a handler for when nodes are disabled/enabled */ + ctdb_register_message_handler(ctdb, ctdb, CTDB_SRVID_NODE_FLAGS_CHANGED, + flag_change_handler, NULL); + + /* start monitoring for dead nodes */ + ctdb_start_monitoring(ctdb); +} + +/* go into main ctdb loop */ +static void ctdb_main_loop(struct ctdb_context *ctdb) +{ + int ret = -1; + + if (strcmp(ctdb->transport, "tcp") == 0) { + int ctdb_tcp_init(struct ctdb_context *); + ret = ctdb_tcp_init(ctdb); + } +#ifdef USE_INFINIBAND + if (strcmp(ctdb->transport, "ib") == 0) { + int ctdb_ibw_init(struct ctdb_context *); + ret = ctdb_ibw_init(ctdb); + } +#endif + if (ret != 0) { + DEBUG(0,("Failed to initialise transport '%s'\n", ctdb->transport)); + return; + } + + /* initialise the transport */ + if (ctdb->methods->initialise(ctdb) != 0) { + DEBUG(0,("transport failed to initialise!\n")); + ctdb_fatal(ctdb, "transport failed to initialise"); + } + + /* tell all other nodes we've just started up */ + ctdb_daemon_send_control(ctdb, CTDB_BROADCAST_ALL, + 0, CTDB_CONTROL_STARTUP, 0, + CTDB_CTRL_FLAG_NOREPLY, + tdb_null, NULL, NULL); + + /* release any IPs we hold from previous runs of the daemon */ + ctdb_release_all_ips(ctdb); + + ret = ctdb_event_script_callback(ctdb, timeval_zero(), ctdb, + ctdb_start_transport, NULL, "startup"); + if (ret != 0) { + DEBUG(0,("Failed startup event script\n")); + return; + } + + /* go into a wait loop to allow other nodes to complete */ + event_loop_wait(ctdb->ev); + + DEBUG(0,("event_loop_wait() returned. this should not happen\n")); + exit(1); +} + + +static void block_signal(int signum) +{ + struct sigaction act; + + memset(&act, 0, sizeof(act)); + + act.sa_handler = SIG_IGN; + sigemptyset(&act.sa_mask); + sigaddset(&act.sa_mask, signum); + sigaction(signum, &act, NULL); +} + + +/* + send a packet to a client + */ +static int daemon_queue_send(struct ctdb_client *client, struct ctdb_req_header *hdr) +{ + client->ctdb->statistics.client_packets_sent++; + return ctdb_queue_send(client->queue, (uint8_t *)hdr, hdr->length); +} + +/* + message handler for when we are in daemon mode. This redirects the message + to the right client + */ +static void daemon_message_handler(struct ctdb_context *ctdb, uint64_t srvid, + TDB_DATA data, void *private_data) +{ + struct ctdb_client *client = talloc_get_type(private_data, struct ctdb_client); + struct ctdb_req_message *r; + int len; + + /* construct a message to send to the client containing the data */ + len = offsetof(struct ctdb_req_message, data) + data.dsize; + r = ctdbd_allocate_pkt(ctdb, ctdb, CTDB_REQ_MESSAGE, + len, struct ctdb_req_message); + CTDB_NO_MEMORY_VOID(ctdb, r); + + talloc_set_name_const(r, "req_message packet"); + + r->srvid = srvid; + r->datalen = data.dsize; + memcpy(&r->data[0], data.dptr, data.dsize); + + daemon_queue_send(client, &r->hdr); + + talloc_free(r); +} + + +/* + this is called when the ctdb daemon received a ctdb request to + set the srvid from the client + */ +int daemon_register_message_handler(struct ctdb_context *ctdb, uint32_t client_id, uint64_t srvid) +{ + struct ctdb_client *client = ctdb_reqid_find(ctdb, client_id, struct ctdb_client); + int res; + if (client == NULL) { + DEBUG(0,("Bad client_id in daemon_request_register_message_handler\n")); + return -1; + } + res = ctdb_register_message_handler(ctdb, client, srvid, daemon_message_handler, client); + if (res != 0) { + DEBUG(0,(__location__ " Failed to register handler %llu in daemon\n", + (unsigned long long)srvid)); + } else { + DEBUG(2,(__location__ " Registered message handler for srvid=%llu\n", + (unsigned long long)srvid)); + } + + /* this is a hack for Samba - we now know the pid of the Samba client */ + if ((srvid & 0xFFFFFFFF) == srvid && + kill(srvid, 0) == 0) { + client->pid = srvid; + DEBUG(0,(__location__ " Registered PID %u for client %u\n", + (unsigned)client->pid, client_id)); + } + return res; +} + +/* + this is called when the ctdb daemon received a ctdb request to + remove a srvid from the client + */ +int daemon_deregister_message_handler(struct ctdb_context *ctdb, uint32_t client_id, uint64_t srvid) +{ + struct ctdb_client *client = ctdb_reqid_find(ctdb, client_id, struct ctdb_client); + if (client == NULL) { + DEBUG(0,("Bad client_id in daemon_request_deregister_message_handler\n")); + return -1; + } + return ctdb_deregister_message_handler(ctdb, srvid, client); +} + + +/* + destroy a ctdb_client +*/ +static int ctdb_client_destructor(struct ctdb_client *client) +{ + ctdb_takeover_client_destructor_hook(client); + ctdb_reqid_remove(client->ctdb, client->client_id); + client->ctdb->statistics.num_clients--; + return 0; +} + + +/* + this is called when the ctdb daemon received a ctdb request message + from a local client over the unix domain socket + */ +static void daemon_request_message_from_client(struct ctdb_client *client, + struct ctdb_req_message *c) +{ + TDB_DATA data; + int res; + + /* maybe the message is for another client on this node */ + if (ctdb_get_vnn(client->ctdb)==c->hdr.destnode) { + ctdb_request_message(client->ctdb, (struct ctdb_req_header *)c); + return; + } + + /* its for a remote node */ + data.dptr = &c->data[0]; + data.dsize = c->datalen; + res = ctdb_daemon_send_message(client->ctdb, c->hdr.destnode, + c->srvid, data); + if (res != 0) { + DEBUG(0,(__location__ " Failed to send message to remote node %u\n", + c->hdr.destnode)); + } +} + + +struct daemon_call_state { + struct ctdb_client *client; + uint32_t reqid; + struct ctdb_call *call; + struct timeval start_time; +}; + +/* + complete a call from a client +*/ +static void daemon_call_from_client_callback(struct ctdb_call_state *state) +{ + struct daemon_call_state *dstate = talloc_get_type(state->async.private_data, + struct daemon_call_state); + struct ctdb_reply_call *r; + int res; + uint32_t length; + struct ctdb_client *client = dstate->client; + + talloc_steal(client, dstate); + talloc_steal(dstate, dstate->call); + + res = ctdb_daemon_call_recv(state, dstate->call); + if (res != 0) { + DEBUG(0, (__location__ " ctdbd_call_recv() returned error\n")); + client->ctdb->statistics.pending_calls--; + ctdb_latency(&client->ctdb->statistics.max_call_latency, dstate->start_time); + return; + } + + length = offsetof(struct ctdb_reply_call, data) + dstate->call->reply_data.dsize; + r = ctdbd_allocate_pkt(client->ctdb, dstate, CTDB_REPLY_CALL, + length, struct ctdb_reply_call); + if (r == NULL) { + DEBUG(0, (__location__ " Failed to allocate reply_call in ctdb daemon\n")); + client->ctdb->statistics.pending_calls--; + ctdb_latency(&client->ctdb->statistics.max_call_latency, dstate->start_time); + return; + } + r->hdr.reqid = dstate->reqid; + r->datalen = dstate->call->reply_data.dsize; + memcpy(&r->data[0], dstate->call->reply_data.dptr, r->datalen); + + res = daemon_queue_send(client, &r->hdr); + if (res != 0) { + DEBUG(0, (__location__ " Failed to queue packet from daemon to client\n")); + } + ctdb_latency(&client->ctdb->statistics.max_call_latency, dstate->start_time); + talloc_free(dstate); + client->ctdb->statistics.pending_calls--; +} + + +static void daemon_request_call_from_client(struct ctdb_client *client, + struct ctdb_req_call *c); + +/* + this is called when the ctdb daemon received a ctdb request call + from a local client over the unix domain socket + */ +static void daemon_request_call_from_client(struct ctdb_client *client, + struct ctdb_req_call *c) +{ + struct ctdb_call_state *state; + struct ctdb_db_context *ctdb_db; + struct daemon_call_state *dstate; + struct ctdb_call *call; + struct ctdb_ltdb_header header; + TDB_DATA key, data; + int ret; + struct ctdb_context *ctdb = client->ctdb; + + ctdb->statistics.total_calls++; + ctdb->statistics.pending_calls++; + + ctdb_db = find_ctdb_db(client->ctdb, c->db_id); + if (!ctdb_db) { + DEBUG(0, (__location__ " Unknown database in request. db_id==0x%08x", + c->db_id)); + ctdb->statistics.pending_calls--; + return; + } + + key.dptr = c->data; + key.dsize = c->keylen; + + ret = ctdb_ltdb_lock_fetch_requeue(ctdb_db, key, &header, + (struct ctdb_req_header *)c, &data, + daemon_incoming_packet, client, True); + if (ret == -2) { + /* will retry later */ + ctdb->statistics.pending_calls--; + return; + } + + if (ret != 0) { + DEBUG(0,(__location__ " Unable to fetch record\n")); + ctdb->statistics.pending_calls--; + return; + } + + dstate = talloc(client, struct daemon_call_state); + if (dstate == NULL) { + ctdb_ltdb_unlock(ctdb_db, key); + DEBUG(0,(__location__ " Unable to allocate dstate\n")); + ctdb->statistics.pending_calls--; + return; + } + dstate->start_time = timeval_current(); + dstate->client = client; + dstate->reqid = c->hdr.reqid; + talloc_steal(dstate, data.dptr); + + call = dstate->call = talloc_zero(dstate, struct ctdb_call); + if (call == NULL) { + ctdb_ltdb_unlock(ctdb_db, key); + DEBUG(0,(__location__ " Unable to allocate call\n")); + ctdb->statistics.pending_calls--; + ctdb_latency(&ctdb->statistics.max_call_latency, dstate->start_time); + return; + } + + call->call_id = c->callid; + call->key = key; + call->call_data.dptr = c->data + c->keylen; + call->call_data.dsize = c->calldatalen; + call->flags = c->flags; + + if (header.dmaster == ctdb->vnn) { + state = ctdb_call_local_send(ctdb_db, call, &header, &data); + } else { + state = ctdb_daemon_call_send_remote(ctdb_db, call, &header); + } + + ctdb_ltdb_unlock(ctdb_db, key); + + if (state == NULL) { + DEBUG(0,(__location__ " Unable to setup call send\n")); + ctdb->statistics.pending_calls--; + ctdb_latency(&ctdb->statistics.max_call_latency, dstate->start_time); + return; + } + talloc_steal(state, dstate); + talloc_steal(client, state); + + state->async.fn = daemon_call_from_client_callback; + state->async.private_data = dstate; +} + + +static void daemon_request_control_from_client(struct ctdb_client *client, + struct ctdb_req_control *c); + +/* data contains a packet from the client */ +static void daemon_incoming_packet(void *p, struct ctdb_req_header *hdr) +{ + struct ctdb_client *client = talloc_get_type(p, struct ctdb_client); + TALLOC_CTX *tmp_ctx; + struct ctdb_context *ctdb = client->ctdb; + + /* place the packet as a child of a tmp_ctx. We then use + talloc_free() below to free it. If any of the calls want + to keep it, then they will steal it somewhere else, and the + talloc_free() will be a no-op */ + tmp_ctx = talloc_new(client); + talloc_steal(tmp_ctx, hdr); + + if (hdr->ctdb_magic != CTDB_MAGIC) { + ctdb_set_error(client->ctdb, "Non CTDB packet rejected in daemon\n"); + goto done; + } + + if (hdr->ctdb_version != CTDB_VERSION) { + ctdb_set_error(client->ctdb, "Bad CTDB version 0x%x rejected in daemon\n", hdr->ctdb_version); + goto done; + } + + switch (hdr->operation) { + case CTDB_REQ_CALL: + ctdb->statistics.client.req_call++; + daemon_request_call_from_client(client, (struct ctdb_req_call *)hdr); + break; + + case CTDB_REQ_MESSAGE: + ctdb->statistics.client.req_message++; + daemon_request_message_from_client(client, (struct ctdb_req_message *)hdr); + break; + + case CTDB_REQ_CONTROL: + ctdb->statistics.client.req_control++; + daemon_request_control_from_client(client, (struct ctdb_req_control *)hdr); + break; + + default: + DEBUG(0,(__location__ " daemon: unrecognized operation %u\n", + hdr->operation)); + } + +done: + talloc_free(tmp_ctx); +} + +/* + called when the daemon gets a incoming packet + */ +static void ctdb_daemon_read_cb(uint8_t *data, size_t cnt, void *args) +{ + struct ctdb_client *client = talloc_get_type(args, struct ctdb_client); + struct ctdb_req_header *hdr; + + if (cnt == 0) { + talloc_free(client); + return; + } + + client->ctdb->statistics.client_packets_recv++; + + if (cnt < sizeof(*hdr)) { + ctdb_set_error(client->ctdb, "Bad packet length %u in daemon\n", + (unsigned)cnt); + return; + } + hdr = (struct ctdb_req_header *)data; + if (cnt != hdr->length) { + ctdb_set_error(client->ctdb, "Bad header length %u expected %u\n in daemon", + (unsigned)hdr->length, (unsigned)cnt); + return; + } + + if (hdr->ctdb_magic != CTDB_MAGIC) { + ctdb_set_error(client->ctdb, "Non CTDB packet rejected\n"); + return; + } + + if (hdr->ctdb_version != CTDB_VERSION) { + ctdb_set_error(client->ctdb, "Bad CTDB version 0x%x rejected in daemon\n", hdr->ctdb_version); + return; + } + + DEBUG(3,(__location__ " client request %u of type %u length %u from " + "node %u to %u\n", hdr->reqid, hdr->operation, hdr->length, + hdr->srcnode, hdr->destnode)); + + /* it is the responsibility of the incoming packet function to free 'data' */ + daemon_incoming_packet(client, hdr); +} + +static void ctdb_accept_client(struct event_context *ev, struct fd_event *fde, + uint16_t flags, void *private_data) +{ + struct sockaddr_in addr; + socklen_t len; + int fd; + struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context); + struct ctdb_client *client; + + memset(&addr, 0, sizeof(addr)); + len = sizeof(addr); + fd = accept(ctdb->daemon.sd, (struct sockaddr *)&addr, &len); + if (fd == -1) { + return; + } + + set_nonblocking(fd); + set_close_on_exec(fd); + + client = talloc_zero(ctdb, struct ctdb_client); + client->ctdb = ctdb; + client->fd = fd; + client->client_id = ctdb_reqid_new(ctdb, client); + ctdb->statistics.num_clients++; + + client->queue = ctdb_queue_setup(ctdb, client, fd, CTDB_DS_ALIGNMENT, + ctdb_daemon_read_cb, client); + + talloc_set_destructor(client, ctdb_client_destructor); +} + + + +/* + create a unix domain socket and bind it + return a file descriptor open on the socket +*/ +static int ux_socket_bind(struct ctdb_context *ctdb) +{ + struct sockaddr_un addr; + + ctdb->daemon.sd = socket(AF_UNIX, SOCK_STREAM, 0); + if (ctdb->daemon.sd == -1) { + return -1; + } + + set_nonblocking(ctdb->daemon.sd); + set_close_on_exec(ctdb->daemon.sd); + +#if 0 + /* AIX doesn't like this :( */ + if (fchown(ctdb->daemon.sd, geteuid(), getegid()) != 0 || + fchmod(ctdb->daemon.sd, 0700) != 0) { + DEBUG(0,("Unable to secure ctdb socket '%s', ctdb->daemon.name\n")); + goto failed; + } +#endif + + set_nonblocking(ctdb->daemon.sd); + + memset(&addr, 0, sizeof(addr)); + addr.sun_family = AF_UNIX; + strncpy(addr.sun_path, ctdb->daemon.name, sizeof(addr.sun_path)); + + if (bind(ctdb->daemon.sd, (struct sockaddr *)&addr, sizeof(addr)) == -1) { + DEBUG(0,("Unable to bind on ctdb socket '%s'\n", ctdb->daemon.name)); + goto failed; + } + if (listen(ctdb->daemon.sd, 10) != 0) { + DEBUG(0,("Unable to listen on ctdb socket '%s'\n", ctdb->daemon.name)); + goto failed; + } + + return 0; + +failed: + close(ctdb->daemon.sd); + ctdb->daemon.sd = -1; + return -1; +} + +/* + delete the socket on exit - called on destruction of autofree context + */ +static int unlink_destructor(const char *name) +{ + unlink(name); + return 0; +} + + +/* + start the protocol going as a daemon +*/ +int ctdb_start_daemon(struct ctdb_context *ctdb, bool do_fork) +{ + int res; + struct fd_event *fde; + const char *domain_socket_name; + + /* get rid of any old sockets */ + unlink(ctdb->daemon.name); + + /* create a unix domain stream socket to listen to */ + res = ux_socket_bind(ctdb); + if (res!=0) { + DEBUG(0,(__location__ " Failed to open CTDB unix domain socket\n")); + exit(10); + } + + if (do_fork && fork()) { + return 0; + } + + tdb_reopen_all(False); + + if (do_fork) { + setsid(); + } + block_signal(SIGPIPE); + + /* try to set us up as realtime */ + ctdb_set_realtime(true); + + /* ensure the socket is deleted on exit of the daemon */ + domain_socket_name = talloc_strdup(talloc_autofree_context(), ctdb->daemon.name); + talloc_set_destructor(domain_socket_name, unlink_destructor); + + ctdb->ev = event_context_init(NULL); + + /* start frozen, then let the first election sort things out */ + if (!ctdb_blocking_freeze(ctdb)) { + DEBUG(0,("Failed to get initial freeze\n")); + exit(12); + } + + /* force initial recovery for election */ + ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE; + + /* now start accepting clients, only can do this once frozen */ + fde = event_add_fd(ctdb->ev, ctdb, ctdb->daemon.sd, + EVENT_FD_READ|EVENT_FD_AUTOCLOSE, + ctdb_accept_client, ctdb); + + ctdb_main_loop(ctdb); + + return 0; +} + +/* + allocate a packet for use in daemon<->daemon communication + */ +struct ctdb_req_header *_ctdb_transport_allocate(struct ctdb_context *ctdb, + TALLOC_CTX *mem_ctx, + enum ctdb_operation operation, + size_t length, size_t slength, + const char *type) +{ + int size; + struct ctdb_req_header *hdr; + + length = MAX(length, slength); + size = (length+(CTDB_DS_ALIGNMENT-1)) & ~(CTDB_DS_ALIGNMENT-1); + + hdr = (struct ctdb_req_header *)ctdb->methods->allocate_pkt(mem_ctx, size); + if (hdr == NULL) { + DEBUG(0,("Unable to allocate transport packet for operation %u of length %u\n", + operation, (unsigned)length)); + return NULL; + } + talloc_set_name_const(hdr, type); + memset(hdr, 0, slength); + hdr->length = length; + hdr->operation = operation; + hdr->ctdb_magic = CTDB_MAGIC; + hdr->ctdb_version = CTDB_VERSION; + hdr->generation = ctdb->vnn_map->generation; + hdr->srcnode = ctdb->vnn; + + return hdr; +} + +struct daemon_control_state { + struct daemon_control_state *next, *prev; + struct ctdb_client *client; + struct ctdb_req_control *c; + uint32_t reqid; + struct ctdb_node *node; +}; + +/* + callback when a control reply comes in + */ +static void daemon_control_callback(struct ctdb_context *ctdb, + int32_t status, TDB_DATA data, + const char *errormsg, + void *private_data) +{ + struct daemon_control_state *state = talloc_get_type(private_data, + struct daemon_control_state); + struct ctdb_client *client = state->client; + struct ctdb_reply_control *r; + size_t len; + + /* construct a message to send to the client containing the data */ + len = offsetof(struct ctdb_reply_control, data) + data.dsize; + if (errormsg) { + len += strlen(errormsg); + } + r = ctdbd_allocate_pkt(ctdb, state, CTDB_REPLY_CONTROL, len, + struct ctdb_reply_control); + CTDB_NO_MEMORY_VOID(ctdb, r); + + r->hdr.reqid = state->reqid; + r->status = status; + r->datalen = data.dsize; + r->errorlen = 0; + memcpy(&r->data[0], data.dptr, data.dsize); + if (errormsg) { + r->errorlen = strlen(errormsg); + memcpy(&r->data[r->datalen], errormsg, r->errorlen); + } + + daemon_queue_send(client, &r->hdr); + + talloc_free(state); +} + +/* + fail all pending controls to a disconnected node + */ +void ctdb_daemon_cancel_controls(struct ctdb_context *ctdb, struct ctdb_node *node) +{ + struct daemon_control_state *state; + while ((state = node->pending_controls)) { + DLIST_REMOVE(node->pending_controls, state); + daemon_control_callback(ctdb, (uint32_t)-1, tdb_null, + "node is disconnected", state); + } +} + +/* + destroy a daemon_control_state + */ +static int daemon_control_destructor(struct daemon_control_state *state) +{ + if (state->node) { + DLIST_REMOVE(state->node->pending_controls, state); + } + return 0; +} + +/* + this is called when the ctdb daemon received a ctdb request control + from a local client over the unix domain socket + */ +static void daemon_request_control_from_client(struct ctdb_client *client, + struct ctdb_req_control *c) +{ + TDB_DATA data; + int res; + struct daemon_control_state *state; + TALLOC_CTX *tmp_ctx = talloc_new(client); + + if (c->hdr.destnode == CTDB_CURRENT_NODE) { + c->hdr.destnode = client->ctdb->vnn; + } + + state = talloc(client, struct daemon_control_state); + CTDB_NO_MEMORY_VOID(client->ctdb, state); + + state->client = client; + state->c = talloc_steal(state, c); + state->reqid = c->hdr.reqid; + if (ctdb_validate_vnn(client->ctdb, c->hdr.destnode)) { + state->node = client->ctdb->nodes[c->hdr.destnode]; + DLIST_ADD(state->node->pending_controls, state); + } else { + state->node = NULL; + } + + talloc_set_destructor(state, daemon_control_destructor); + + if (c->flags & CTDB_CTRL_FLAG_NOREPLY) { + talloc_steal(tmp_ctx, state); + } + + data.dptr = &c->data[0]; + data.dsize = c->datalen; + res = ctdb_daemon_send_control(client->ctdb, c->hdr.destnode, + c->srvid, c->opcode, client->client_id, + c->flags, + data, daemon_control_callback, + state); + if (res != 0) { + DEBUG(0,(__location__ " Failed to send control to remote node %u\n", + c->hdr.destnode)); + } + + talloc_free(tmp_ctx); +} + +/* + register a call function +*/ +int ctdb_daemon_set_call(struct ctdb_context *ctdb, uint32_t db_id, + ctdb_fn_t fn, int id) +{ + struct ctdb_registered_call *call; + struct ctdb_db_context *ctdb_db; + + ctdb_db = find_ctdb_db(ctdb, db_id); + if (ctdb_db == NULL) { + return -1; + } + + call = talloc(ctdb_db, struct ctdb_registered_call); + call->fn = fn; + call->id = id; + + DLIST_ADD(ctdb_db->calls, call); + return 0; +} + + + +/* + this local messaging handler is ugly, but is needed to prevent + recursion in ctdb_send_message() when the destination node is the + same as the source node + */ +struct ctdb_local_message { + struct ctdb_context *ctdb; + uint64_t srvid; + TDB_DATA data; +}; + +static void ctdb_local_message_trigger(struct event_context *ev, struct timed_event *te, + struct timeval t, void *private_data) +{ + struct ctdb_local_message *m = talloc_get_type(private_data, + struct ctdb_local_message); + int res; + + res = ctdb_dispatch_message(m->ctdb, m->srvid, m->data); + if (res != 0) { + DEBUG(0, (__location__ " Failed to dispatch message for srvid=%llu\n", + (unsigned long long)m->srvid)); + } + talloc_free(m); +} + +static int ctdb_local_message(struct ctdb_context *ctdb, uint64_t srvid, TDB_DATA data) +{ + struct ctdb_local_message *m; + m = talloc(ctdb, struct ctdb_local_message); + CTDB_NO_MEMORY(ctdb, m); + + m->ctdb = ctdb; + m->srvid = srvid; + m->data = data; + m->data.dptr = talloc_memdup(m, m->data.dptr, m->data.dsize); + if (m->data.dptr == NULL) { + talloc_free(m); + return -1; + } + + /* this needs to be done as an event to prevent recursion */ + event_add_timed(ctdb->ev, m, timeval_zero(), ctdb_local_message_trigger, m); + return 0; +} + +/* + send a ctdb message +*/ +int ctdb_daemon_send_message(struct ctdb_context *ctdb, uint32_t vnn, + uint64_t srvid, TDB_DATA data) +{ + struct ctdb_req_message *r; + int len; + + /* see if this is a message to ourselves */ + if (vnn == ctdb->vnn) { + return ctdb_local_message(ctdb, srvid, data); + } + + len = offsetof(struct ctdb_req_message, data) + data.dsize; + r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_MESSAGE, len, + struct ctdb_req_message); + CTDB_NO_MEMORY(ctdb, r); + + r->hdr.destnode = vnn; + r->srvid = srvid; + r->datalen = data.dsize; + memcpy(&r->data[0], data.dptr, data.dsize); + + ctdb_queue_packet(ctdb, &r->hdr); + + talloc_free(r); + return 0; +} + |