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https://github.com/samba-team/samba.git
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338c3f8523
avoid the horrors of posix locking, but it was preventing us having an ldb open twice with different options. Now each ldb open of the same file shares the same underlying tdb, but uses a different ldb structure (This used to be commit 4e090c66dfa1d2764e4693578d3845be3b8893f6)
116 lines
2.8 KiB
C
116 lines
2.8 KiB
C
/*
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ldb database library
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Copyright (C) Andrew Tridgell 2005
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** NOTE! The following LGPL license applies to the ldb
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** library. This does NOT imply that all of Samba is released
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** under the LGPL
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "includes.h"
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#include "ldb/include/ldb.h"
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#include "ldb/include/ldb_private.h"
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#include "ldb/ldb_tdb/ldb_tdb.h"
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/*
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the purpose of this code is to work around the braindead posix locking
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rules, to allow us to have a ldb open more than once while allowing
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locking to work
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*/
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struct ltdb_wrap {
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struct ltdb_wrap *next, *prev;
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struct tdb_context *tdb;
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dev_t device;
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ino_t inode;
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};
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static struct ltdb_wrap *tdb_list;
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/* destroy the last connection to a tdb */
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static int ltdb_wrap_destructor(void *ctx)
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{
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struct ltdb_wrap *w = talloc_get_type(ctx, struct ltdb_wrap);
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tdb_close(w->tdb);
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if (w->next) {
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w->next->prev = w->prev;
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}
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if (w->prev) {
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w->prev->next = w->next;
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}
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if (w == tdb_list) {
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tdb_list = w->next;
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}
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return 0;
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}
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/*
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wrapped connection to a tdb database. The caller should _not_ free
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this as it is not a talloc structure (as tdb does not use talloc
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yet). It will auto-close when the caller frees the mem_ctx that is
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passed to this call
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*/
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struct tdb_context *ltdb_wrap_open(TALLOC_CTX *mem_ctx,
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const char *path, int hash_size, int tdb_flags,
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int open_flags, mode_t mode)
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{
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struct ltdb_wrap *w;
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struct stat st;
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if (stat(path, &st) == 0) {
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for (w=tdb_list;w;w=w->next) {
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if (st.st_dev == w->device && st.st_ino == w->inode) {
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talloc_reference(mem_ctx, w);
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return w->tdb;
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}
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}
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}
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w = talloc(mem_ctx, struct ltdb_wrap);
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if (w == NULL) {
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return NULL;
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}
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w->tdb = tdb_open(path, hash_size, tdb_flags, open_flags, mode);
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if (w->tdb == NULL) {
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talloc_free(w);
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return NULL;
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}
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if (fstat(w->tdb->fd, &st) != 0) {
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tdb_close(w->tdb);
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talloc_free(w);
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return NULL;
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}
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w->device = st.st_dev;
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w->inode = st.st_ino;
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talloc_set_destructor(w, ltdb_wrap_destructor);
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w->next = tdb_list;
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w->prev = NULL;
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if (tdb_list) {
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tdb_list->prev = w;
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}
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tdb_list = w;
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return w->tdb;
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}
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