+++ /dev/null
-/*
- 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 "../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 = s4_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;
-}
-
git.samba.org / gd / samba / .git / blobdiff