2 Unix SMB/CIFS implementation.
5 Copyright (C) Andrew Tridgell 2004
6 Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "lib/util/dlinklist.h"
24 #include "lib/tdb_wrap/tdb_wrap.h"
25 #include "lib/param/param.h"
28 Log tdb messages via DEBUG().
30 static void tdb_wrap_log(TDB_CONTEXT *tdb, enum tdb_debug_level level,
31 const char *format, ...) PRINTF_ATTRIBUTE(3,4);
33 static void tdb_wrap_log(TDB_CONTEXT *tdb, enum tdb_debug_level level,
34 const char *format, ...)
48 case TDB_DEBUG_WARNING:
59 ret = vasprintf(&ptr, format, ap);
63 const char *name = tdb_name(tdb);
64 DEBUG(debuglevel, ("tdb(%s): %s", name ? name : "unnamed", ptr));
69 struct tdb_wrap_private {
70 struct tdb_context *tdb;
72 struct tdb_wrap_private *next, *prev;
75 static struct tdb_wrap_private *tdb_list;
77 /* destroy the last connection to a tdb */
78 static int tdb_wrap_private_destructor(struct tdb_wrap_private *w)
81 DLIST_REMOVE(tdb_list, w);
85 static struct tdb_wrap_private *tdb_wrap_private_open(TALLOC_CTX *mem_ctx,
91 struct loadparm_context *lp_ctx)
93 struct tdb_wrap_private *result;
95 result = talloc(mem_ctx, struct tdb_wrap_private);
99 result->name = talloc_strdup(result, name);
100 if (result->name == NULL) {
104 if (!lpcfg_use_mmap(lp_ctx)) {
105 tdb_flags |= TDB_NOMMAP;
108 if ((hash_size == 0) && (name != NULL)) {
110 base = strrchr_m(name, '/');
117 hash_size = lpcfg_parm_int(lp_ctx, NULL, "tdb_hashsize", base, 0);
120 result->tdb = tdb_open_compat(name, hash_size, tdb_flags,
121 open_flags, mode, tdb_wrap_log, NULL);
122 if (result->tdb == NULL) {
125 talloc_set_destructor(result, tdb_wrap_private_destructor);
126 DLIST_ADD(tdb_list, result);
135 wrapped connection to a tdb database
136 to close just talloc_free() the tdb_wrap pointer
138 struct tdb_wrap *tdb_wrap_open(TALLOC_CTX *mem_ctx,
139 const char *name, int hash_size, int tdb_flags,
140 int open_flags, mode_t mode,
141 struct loadparm_context *lp_ctx)
143 struct tdb_wrap *result;
144 struct tdb_wrap_private *w;
146 result = talloc(mem_ctx, struct tdb_wrap);
147 if (result == NULL) {
151 for (w=tdb_list;w;w=w->next) {
152 if (strcmp(name, w->name) == 0) {
158 w = tdb_wrap_private_open(result, name, hash_size, tdb_flags,
159 open_flags, mode, lp_ctx);
162 * Correctly use talloc_reference: The tdb will be
163 * closed when "w" is being freed. The caller never
164 * sees "w", so an incorrect use of talloc_free(w)
165 * instead of calling talloc_unlink is not possible.
166 * To avoid having to refcount ourselves, "w" will
167 * have multiple parents that hang off all the
168 * tdb_wrap's being returned from here. Those parents
169 * can be freed without problem.
171 if (talloc_reference(result, w) == NULL) {
178 result->tdb = w->tdb;