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samba-mirror/ctdb/common/ctdb_daemon.c

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/*
ctdb daemon code
Copyright (C) Andrew Tridgell 2006
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#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 *);
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;
}
/* start the transport running */
if (ctdb->methods->start(ctdb) != 0) {
DEBUG(0,("transport failed to start!\n"));
ctdb_fatal(ctdb, "transport failed to start");
}
/* 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);
/* 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 set_non_blocking(int fd)
{
unsigned v;
v = fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, v | O_NONBLOCK);
}
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->status.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", srvid));
} else {
DEBUG(2,(__location__ " Registered message handler for srvid=%llu\n", srvid));
}
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);
}
/*
called when the daemon gets a shutdown request from a client
*/
static void daemon_request_shutdown(struct ctdb_client *client,
struct ctdb_req_shutdown *f)
{
struct ctdb_context *ctdb = talloc_get_type(client->ctdb, struct ctdb_context);
int len;
uint32_t node;
/* we dont send to ourself so we can already count one daemon as
exiting */
ctdb->num_finished++;
/* loop over all nodes of the cluster */
for (node=0; node<ctdb->num_nodes;node++) {
struct ctdb_req_finished *rf;
/* dont send a message to ourself */
if (ctdb->vnn == node) {
continue;
}
len = sizeof(struct ctdb_req_finished);
rf = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_FINISHED, len,
struct ctdb_req_finished);
CTDB_NO_MEMORY_FATAL(ctdb, rf);
rf->hdr.destnode = node;
ctdb_queue_packet(ctdb, &(rf->hdr));
talloc_free(rf);
}
/* wait until all nodes have are prepared to shutdown */
while (ctdb->num_finished != ctdb->num_nodes) {
event_loop_once(ctdb->ev);
}
/* all daemons have requested to finish - we now exit */
DEBUG(1,("All daemons finished - exiting\n"));
_exit(0);
}
/*
called when the daemon gets a connect wait request from a client
*/
static void daemon_request_connect_wait(struct ctdb_client *client,
struct ctdb_req_connect_wait *c)
{
struct ctdb_reply_connect_wait *r;
int res;
/* first wait - in the daemon */
ctdb_daemon_connect_wait(client->ctdb);
/* now send the reply */
r = ctdbd_allocate_pkt(client->ctdb, client, CTDB_REPLY_CONNECT_WAIT, sizeof(*r),
struct ctdb_reply_connect_wait);
CTDB_NO_MEMORY_VOID(client->ctdb, r);
r->vnn = ctdb_get_vnn(client->ctdb);
r->num_connected = client->ctdb->num_connected;
res = daemon_queue_send(client, &r->hdr);
talloc_free(r);
if (res != 0) {
DEBUG(0,(__location__ " Failed to queue a connect wait response\n"));
return;
}
}
/*
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->status.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->status.pending_calls--;
ctdb_latency(&client->ctdb->status.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->status.pending_calls--;
ctdb_latency(&client->ctdb->status.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->status.max_call_latency, dstate->start_time);
talloc_free(dstate);
client->ctdb->status.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->status.total_calls++;
ctdb->status.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->status.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->status.pending_calls--;
return;
}
if (ret != 0) {
DEBUG(0,(__location__ " Unable to fetch record\n"));
ctdb->status.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->status.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->status.pending_calls--;
ctdb_latency(&ctdb->status.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 && !(ctdb->flags & CTDB_FLAG_SELF_CONNECT)) {
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->status.pending_calls--;
ctdb_latency(&ctdb->status.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->status.client.req_call++;
daemon_request_call_from_client(client, (struct ctdb_req_call *)hdr);
break;
case CTDB_REQ_MESSAGE:
ctdb->status.client.req_message++;
daemon_request_message_from_client(client, (struct ctdb_req_message *)hdr);
break;
case CTDB_REQ_CONNECT_WAIT:
ctdb->status.client.req_connect_wait++;
daemon_request_connect_wait(client, (struct ctdb_req_connect_wait *)hdr);
break;
case CTDB_REQ_SHUTDOWN:
ctdb->status.client.req_shutdown++;
daemon_request_shutdown(client, (struct ctdb_req_shutdown *)hdr);
break;
case CTDB_REQ_CONTROL:
ctdb->status.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->status.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_non_blocking(fd);
client = talloc_zero(ctdb, struct ctdb_client);
client->ctdb = ctdb;
client->fd = fd;
client->client_id = ctdb_reqid_new(ctdb, client);
ctdb->status.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);
}
static void ctdb_read_from_parent(struct event_context *ev, struct fd_event *fde,
uint16_t flags, void *private_data)
{
int *fd = private_data;
int cnt;
char buf;
/* XXX this is a good place to try doing some cleaning up before exiting */
cnt = read(*fd, &buf, 1);
if (cnt==0) {
DEBUG(2,(__location__ " parent process exited. filedescriptor dissappeared\n"));
exit(1);
} else {
DEBUG(0,(__location__ " ctdb: did not expect data from parent process\n"));
exit(1);
}
}
/*
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;
}
#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_non_blocking(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', ctdb->daemon.name\n"));
goto failed;
}
if (listen(ctdb->daemon.sd, 10) != 0) {
DEBUG(0,("Unable to listen on ctdb socket '%s', ctdb->daemon.name\n"));
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
*/
int ctdb_start(struct ctdb_context *ctdb)
{
pid_t pid;
static int fd[2];
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);
}
res = pipe(&fd[0]);
if (res) {
DEBUG(0,(__location__ " Failed to open pipe for CTDB\n"));
exit(1);
}
pid = fork();
if (pid==-1) {
DEBUG(0,(__location__ " Failed to fork CTDB daemon\n"));
exit(1);
}
if (pid) {
close(fd[0]);
close(ctdb->daemon.sd);
ctdb->daemon.sd = -1;
ctdb->vnn = ctdb_ctrl_getvnn(ctdb, timeval_zero(), CTDB_CURRENT_NODE);
if (ctdb->vnn == (uint32_t)-1) {
DEBUG(0,(__location__ " Failed to get ctdb vnn\n"));
return -1;
}
return 0;
}
block_signal(SIGPIPE);
/* 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);
close(fd[1]);
ctdb->ev = event_context_init(NULL);
fde = event_add_fd(ctdb->ev, ctdb, fd[0], EVENT_FD_READ|EVENT_FD_AUTOCLOSE, ctdb_read_from_parent, &fd[0]);
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;
}
/*
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);
block_signal(SIGCHLD);
/* try to set us up as realtime */
ctdb_set_realtime();
/* start the recovery daemon process */
if (ctdb_start_recoverd(ctdb) != 0) {
DEBUG(0,("Failed to start recovery daemon\n"));
exit(11);
}
/* 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 monitoring for dead nodes */
ctdb_start_monitoring(ctdb);
/* 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 client<->daemon communication
*/
struct ctdb_req_header *_ctdbd_allocate_pkt(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 *)talloc_size(mem_ctx, size);
if (hdr == NULL) {
DEBUG(0,("Unable to allocate packet for operation %u of length %u\n",
operation, 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->srcnode = ctdb->vnn;
if (ctdb->vnn_map) {
hdr->generation = ctdb->vnn_map->generation;
}
return hdr;
}
/*
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, 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;
}
/*
called when a CTDB_REQ_FINISHED packet comes in
*/
void ctdb_request_finished(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
{
ctdb->num_finished++;
}
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;
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);
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));
}
if (c->flags & CTDB_CTRL_FLAG_NOREPLY) {
talloc_free(state);
}
}
/*
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;
}