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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 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 "ldb/include/ldb.h"
#include "ldb/include/ldb_private.h"
#include "ldb/ldb_tdb/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(void *ctx)
{
struct ltdb_wrap *w = talloc_get_type(ctx, struct ltdb_wrap);
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;
}
/*
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 ltdb_wrap *w;
struct stat st;
if (stat(path, &st) == 0) {
for (w=tdb_list;w;w=w->next) {
if (st.st_dev == w->device && st.st_ino == w->inode) {
talloc_reference(mem_ctx, w);
return w->tdb;
}
}
}
w = talloc(mem_ctx, struct ltdb_wrap);
if (w == NULL) {
return NULL;
}
w->tdb = tdb_open(path, hash_size, tdb_flags, open_flags, mode);
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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