Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 197 insertions, 0 deletions

diff --git a/source3/lib/dbwrap/dbwrap_open.c b/source3/lib/dbwrap/dbwrap_open.c
new file mode 100644
index 0000000..52c8a94
--- /dev/null
+++ b/source3/lib/dbwrap/dbwrap_open.c
@@ -0,0 +1,197 @@
+/*
+   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 "global_contexts.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;
+	struct loadparm_context *lp_ctx = NULL;
+
+	if ((lock_order != DBWRAP_LOCK_ORDER_NONE) &&
+	    !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;
+		}
+	}
+
+	if (lp_clustering()) {
+		const char *sockname;
+
+		sockname = lp_ctdbd_socket();
+		if (!socket_exist(sockname)) {
+			DBG_WARNING("ctdb socket does %s not exist - "
+				    "is ctdb not running?\n",
+				    sockname);
+			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;
+
+			/*
+			 * Initialize messaging before getting the ctdb
+			 * connection, as the ctdb connection requires messaging
+			 * to be initialized.
+			 */
+			msg_ctx = global_messaging_context();
+			if (msg_ctx == NULL) {
+				DBG_ERR("Failed to initialize messaging\n");
+				return NULL;
+			}
+
+			conn = messaging_ctdb_connection();
+			if (conn == NULL) {
+				DBG_WARNING("No ctdb connection\n");
+				errno = EIO;
+				return NULL;
+			}
+
+			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;
+			}
+
+			return result;
+		}
+	}
+
+	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;
+}