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/*
ldb database library
Copyright (C) Andrew Tridgell 2005
** NOTE! The following LGPL license applies to the ldb
** library. This does NOT imply that all of Samba is released
** under the LGPL
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "ldb_tdb.h"
/*
the purpose of this code is to work around the braindead posix locking
rules, to allow us to have a ldb open more than once while allowing
locking to work
*/
struct ltdb_wrap {
struct ltdb_wrap *next, *prev;
struct tdb_context *tdb;
dev_t device;
ino_t inode;
};
static struct ltdb_wrap *tdb_list;
/* destroy the last connection to a tdb */
static int ltdb_wrap_destructor(struct ltdb_wrap *w)
{
tdb_close(w->tdb);
if (w->next) {
w->next->prev = w->prev;
}
if (w->prev) {
w->prev->next = w->next;
}
if (w == tdb_list) {
tdb_list = w->next;
}
return 0;
}
static void ltdb_log_fn(struct tdb_context *tdb, enum tdb_debug_level level, const char *fmt, ...) PRINTF_ATTRIBUTE(3, 4);
static void ltdb_log_fn(struct tdb_context *tdb, enum tdb_debug_level level, const char *fmt, ...)
{
va_list ap;
const char *name = tdb_name(tdb);
struct ldb_context *ldb = talloc_get_type(tdb_get_logging_private(tdb), struct ldb_context);
enum ldb_debug_level ldb_level;
char *message;
if (ldb == NULL)
return;
va_start(ap, fmt);
message = talloc_vasprintf(ldb, fmt, ap);
va_end(ap);
switch (level) {
case TDB_DEBUG_FATAL:
ldb_level = LDB_DEBUG_FATAL;
break;
case TDB_DEBUG_ERROR:
ldb_level = LDB_DEBUG_ERROR;
break;
case TDB_DEBUG_WARNING:
ldb_level = LDB_DEBUG_WARNING;
break;
case TDB_DEBUG_TRACE:
ldb_level = LDB_DEBUG_TRACE;
break;
default:
ldb_level = LDB_DEBUG_FATAL;
}
ldb_debug(ldb, ldb_level, "ltdb: tdb(%s): %s", name, message);
talloc_free(message);
}
/*
wrapped connection to a tdb database. The caller should _not_ free
this as it is not a talloc structure (as tdb does not use talloc
yet). It will auto-close when the caller frees the mem_ctx that is
passed to this call
*/
struct tdb_context *ltdb_wrap_open(TALLOC_CTX *mem_ctx,
const char *path, int hash_size,
int tdb_flags,
int open_flags, mode_t mode,
struct ldb_context *ldb)
{
struct ltdb_wrap *w;
struct stat st;
struct tdb_logging_context log_ctx;
log_ctx.log_fn = ltdb_log_fn;
log_ctx.log_private = ldb;
if (stat(path, &st) == 0) {
for (w=tdb_list;w;w=w->next) {
if (st.st_dev == w->device && st.st_ino == w->inode) {
if (!talloc_reference(mem_ctx, w)) {
return NULL;
}
return w->tdb;
}
}
}
w = talloc(mem_ctx, struct ltdb_wrap);
if (w == NULL) {
return NULL;
}
w->tdb = tdb_open_ex(path, hash_size, tdb_flags, open_flags, mode, &log_ctx, NULL);
if (w->tdb == NULL) {
talloc_free(w);
return NULL;
}
if (fstat(tdb_fd(w->tdb), &st) != 0) {
tdb_close(w->tdb);
talloc_free(w);
return NULL;
}
w->device = st.st_dev;
w->inode = st.st_ino;
talloc_set_destructor(w, ltdb_wrap_destructor);
w->next = tdb_list;
w->prev = NULL;
if (tdb_list) {
tdb_list->prev = w;
}
tdb_list = w;
return w->tdb;
}
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