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/*
Unix SMB/CIFS implementation.
ctdb clustering hooks
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 "lib/events/events.h"
#include "cluster/cluster.h"
#include "system/filesys.h"
#include "cluster/cluster_private.h"
#include "lib/tdb/include/tdb.h"
#include "include/ctdb.h"
#include "db_wrap.h"
#include "lib/util/dlinklist.h"
#include "param/param.h"
/* a linked list of messaging handlers, allowing incoming messages
to be directed to the right messaging context */
struct cluster_messaging_list {
struct cluster_messaging_list *next, *prev;
struct cluster_state *state;
struct messaging_context *msg;
struct server_id server;
cluster_message_fn_t handler;
};
struct cluster_state {
struct ctdb_context *ctdb;
struct cluster_messaging_list *list;
uint32_t vnn;
};
/*
return a server_id for a ctdb node
*/
static struct server_id ctdb_id(struct cluster_ops *ops, uint32_t id)
{
struct cluster_state *state = (struct cluster_state *)ops->private;
struct ctdb_context *ctdb = state->ctdb;
struct server_id server_id;
server_id.node = ctdb_get_vnn(ctdb);
server_id.id = id;
return server_id;
}
/*
return a server_id as a string
*/
static const char *ctdb_id_string(struct cluster_ops *ops,
TALLOC_CTX *mem_ctx, struct server_id id)
{
return talloc_asprintf(mem_ctx, "%u.%u", id.node, id.id);
}
/*
this is an interim method for subsystems that have not yet been
converted to use the ctdb api. It opens a shared database in the
cluster temporary area, using TDB_CLEAR_IF_FIRST which relies on
correct operation of fcntl locks on the shared fileystem.
*/
static struct tdb_wrap *ctdb_tdb_tmp_open(struct cluster_ops *ops,
TALLOC_CTX *mem_ctx, const char *dbname,
int flags)
{
const char *dir = lp_parm_string(NULL, "ctdb", "shared data");
char *path;
struct tdb_wrap *w;
if (dir == NULL) {
DEBUG(0,("ERROR: You must set 'ctdb:shared data' to a cluster shared path\n"));
return NULL;
}
path = talloc_asprintf(mem_ctx, "%s/%s", dir, dbname);
w = tdb_wrap_open(mem_ctx, path, 0,
flags | TDB_CLEAR_IF_FIRST,
O_RDWR|O_CREAT, 0600);
talloc_free(path);
return w;
}
/*
get at the ctdb handle
*/
static void *ctdb_backend_handle(struct cluster_ops *ops)
{
struct cluster_state *state = (struct cluster_state *)ops->private;
return (void *)state->ctdb;
}
struct ctdb_handler_state {
struct cluster_state *state;
cluster_message_fn_t handler;
struct messaging_context *msg;
};
/*
dispatch incoming ctdb messages
*/
static void ctdb_message_handler(struct ctdb_context *ctdb, uint64_t srvid,
TDB_DATA data, void *private)
{
struct ctdb_handler_state *s = talloc_get_type(private,
struct ctdb_handler_state);
DATA_BLOB blob;
blob.data = data.dptr;
blob.length = data.dsize;
s->handler(s->msg, blob);
}
static int ctdb_handler_destructor(struct ctdb_handler_state *s)
{
/* XXX - tell ctdb to de-register the message handler */
return 0;
}
/*
setup a handler for ctdb messages
*/
static NTSTATUS ctdb_message_init(struct cluster_ops *ops,
struct messaging_context *msg,
struct server_id server,
cluster_message_fn_t handler)
{
struct cluster_state *state = (struct cluster_state *)ops->private;
struct ctdb_handler_state *h;
int ret;
h = talloc(msg, struct ctdb_handler_state);
NT_STATUS_HAVE_NO_MEMORY(h);
h->state = state;
h->handler = handler;
h->msg = msg;
talloc_set_destructor(h, ctdb_handler_destructor);
/* setup a message handler */
ret = ctdb_set_message_handler(state->ctdb, server.id,
ctdb_message_handler, h);
if (ret == -1) {
DEBUG(0,("ctdb_set_message_handler failed - %s\n",
ctdb_errstr(state->ctdb)));
exit(1);
}
return NT_STATUS_OK;
}
/*
send a ctdb message to another node
*/
static NTSTATUS ctdb_message_send(struct cluster_ops *ops,
struct server_id server, DATA_BLOB *data)
{
struct cluster_state *state = (struct cluster_state *)ops->private;
struct ctdb_context *ctdb = state->ctdb;
TDB_DATA tdata;
int ret;
tdata.dptr = data->data;
tdata.dsize = data->length;
ret = ctdb_send_message(ctdb, server.node, server.id, tdata);
if (ret != 0) {
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
return NT_STATUS_OK;
}
static struct cluster_ops cluster_ctdb_ops = {
.cluster_id = ctdb_id,
.cluster_id_string = ctdb_id_string,
.cluster_tdb_tmp_open = ctdb_tdb_tmp_open,
.backend_handle = ctdb_backend_handle,
.message_init = ctdb_message_init,
.message_send = ctdb_message_send,
.private = NULL
};
/* initialise ctdb */
void cluster_ctdb_init(struct event_context *ev, const char *model)
{
struct cluster_state *state;
int ret;
if (!lp_parm_bool(NULL, "ctdb", "enable", false)) {
return;
}
state = talloc(ev, struct cluster_state);
if (state == NULL) goto failed;
state->ctdb = ctdb_init(ev);
if (state->ctdb == NULL) goto failed;
ret = ctdb_socket_connect(state->ctdb);
if (ret == -1) {
DEBUG(0,(__location__ " Failed to connect to ctdb socket\n"));
goto failed;
}
/* get our vnn */
state->vnn = ctdb_ctrl_getvnn(state->ctdb, timeval_zero(), CTDB_CURRENT_NODE);
if (state->vnn == (uint32_t)-1) {
DEBUG(0,(__location__ " Failed to get ctdb vnn\n"));
goto failed;
}
state->list = NULL;
cluster_ctdb_ops.private = state;
cluster_set_ops(&cluster_ctdb_ops);
#if 0
/* nasty hack for now ... */
{
void brl_ctdb_init_ops(void);
brl_ctdb_init_ops();
}
#endif
return;
failed:
DEBUG(0,("cluster_ctdb_init failed\n"));
talloc_free(state);
}
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