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/*
Unix SMB/CIFS implementation.
Database interface wrapper
Copyright (C) Volker Lendecke 2005-2007
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 "dbwrap/dbwrap.h"
#include "dbwrap/dbwrap_private.h"
#include "dbwrap/dbwrap_open.h"
#include "dbwrap/dbwrap_tdb.h"
#include "dbwrap/dbwrap_ctdb.h"
#include "lib/param/param.h"
#include "lib/cluster_support.h"
#include "lib/messages_ctdb.h"
#include "util_tdb.h"
#include "ctdbd_conn.h"
#include "messages.h"
bool db_is_local(const char *name)
{
const char *sockname = lp_ctdbd_socket();
if (lp_clustering() && socket_exist(sockname)) {
const char *partname;
/* ctdb only wants the file part of the name */
partname = strrchr(name, '/');
if (partname) {
partname++;
} else {
partname = name;
}
/* allow ctdb for individual databases to be disabled */
if (lp_parm_bool(-1, "ctdb", partname, True)) {
return false;
}
}
return true;
}
/**
* open a database
*/
struct db_context *db_open(TALLOC_CTX *mem_ctx,
const char *name,
int hash_size, int tdb_flags,
int open_flags, mode_t mode,
enum dbwrap_lock_order lock_order,
uint64_t dbwrap_flags)
{
struct db_context *result = NULL;
const char *base;
const char *sockname;
if (!DBWRAP_LOCK_ORDER_VALID(lock_order)) {
errno = EINVAL;
return NULL;
}
base = strrchr_m(name, '/');
if (base != NULL) {
base++;
} else {
base = name;
}
if (tdb_flags & TDB_CLEAR_IF_FIRST) {
bool try_readonly = false;
if (dbwrap_flags & DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS) {
try_readonly = true;
}
try_readonly = lp_parm_bool(-1, "dbwrap_optimize_readonly", "*", try_readonly);
try_readonly = lp_parm_bool(-1, "dbwrap_optimize_readonly", base, try_readonly);
if (try_readonly) {
dbwrap_flags |= DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS;
} else {
dbwrap_flags &= ~DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS;
}
}
if (tdb_flags & TDB_CLEAR_IF_FIRST) {
bool try_mutex = true;
bool require_mutex = false;
try_mutex = lp_parm_bool(-1, "dbwrap_tdb_mutexes", "*", try_mutex);
try_mutex = lp_parm_bool(-1, "dbwrap_tdb_mutexes", base, try_mutex);
if (!lp_use_mmap()) {
/*
* Mutexes require mmap. "use mmap = no" can
* be a debugging tool, so let it override the
* mutex parameters
*/
try_mutex = false;
}
if (try_mutex && tdb_runtime_check_for_robust_mutexes()) {
tdb_flags |= TDB_MUTEX_LOCKING;
}
require_mutex = lp_parm_bool(-1, "dbwrap_tdb_require_mutexes",
"*", require_mutex);
require_mutex = lp_parm_bool(-1, "dbwrap_tdb_require_mutexes",
base, require_mutex);
if (require_mutex) {
tdb_flags |= TDB_MUTEX_LOCKING;
}
}
sockname = lp_ctdbd_socket();
if (lp_clustering()) {
if (!socket_exist(sockname)) {
DEBUG(1, ("ctdb socket does not exist - is ctdb not "
"running?\n"));
return NULL;
}
/* allow ctdb for individual databases to be disabled */
if (lp_parm_bool(-1, "ctdb", base, true)) {
struct messaging_context *msg_ctx;
struct ctdbd_connection *conn;
conn = messaging_ctdb_connection();
if (conn == NULL) {
DBG_WARNING("No ctdb connection\n");
errno = EIO;
return NULL;
}
msg_ctx = global_messaging_context();
result = db_open_ctdb(mem_ctx, msg_ctx, base,
hash_size,
tdb_flags, open_flags, mode,
lock_order, dbwrap_flags);
if (result == NULL) {
DBG_ERR("failed to attach to ctdb %s\n", base);
if (errno == 0) {
errno = EIO;
}
return NULL;
}
}
}
if (result == NULL) {
struct loadparm_context *lp_ctx = loadparm_init_s3(mem_ctx, loadparm_s3_helpers());
if (hash_size == 0) {
hash_size = lpcfg_tdb_hash_size(lp_ctx, name);
}
tdb_flags = lpcfg_tdb_flags(lp_ctx, tdb_flags);
result = dbwrap_local_open(
mem_ctx,
name,
hash_size,
tdb_flags,
open_flags,
mode,
lock_order,
dbwrap_flags);
talloc_unlink(mem_ctx, lp_ctx);
}
return result;
}
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