r25690: - only use a readonly traverse in ldb_search when not in a transaction. When we are in a transaction then we could be in a top level modify operation (such as rename), so we must use a writeable traverse so that the async callbacks can do the modifies while the search is progressing.

- don't do the lockall operation on the tdb during a ldb search if in
  a transaction, as this would prevent modifies by callbacks as well

source/lib/ldb/ldb_tdb/ldb_search.c

@@ -253,7 +253,10 @@ int ltdb_search_dn1(struct ldb_module *module, struct ldb_dn *dn, struct ldb_mes
 static int ltdb_lock_read(struct ldb_module *module)
 {
 	struct ltdb_private *ltdb = (struct ltdb_private *)module->private_data;
-	return tdb_lockall_read(ltdb->tdb);
+	if (ltdb->in_transaction == 0) {
+		return tdb_lockall_read(ltdb->tdb);
+	}
+	return 0;
 }
 
 /*
@@ -262,7 +265,10 @@ static int ltdb_lock_read(struct ldb_module *module)
 static int ltdb_unlock_read(struct ldb_module *module)
 {
 	struct ltdb_private *ltdb = (struct ltdb_private *)module->private_data;
-	return tdb_unlockall_read(ltdb->tdb);
+	if (ltdb->in_transaction == 0) {
+		return tdb_unlockall_read(ltdb->tdb);
+	}
+	return 0;
 }
 
 /*
@@ -442,7 +448,11 @@ static int ltdb_search_full(struct ldb_handle *handle)
 	struct ltdb_private *ltdb = talloc_get_type(ac->module->private_data, struct ltdb_private);
 	int ret;
 
-	ret = tdb_traverse_read(ltdb->tdb, search_func, handle);
+	if (ltdb->in_transaction != 0) {
+		ret = tdb_traverse(ltdb->tdb, search_func, handle);
+	} else {
+		ret = tdb_traverse_read(ltdb->tdb, search_func, handle);
+	}
 
 	if (ret == -1) {
 		handle->status = LDB_ERR_OPERATIONS_ERROR;

source/lib/ldb/ldb_tdb/ldb_tdb.c

@@ -907,6 +907,8 @@ static int ltdb_start_trans(struct ldb_module *module)
 		return ltdb_err_map(tdb_error(ltdb->tdb));
 	}
 
+	ltdb->in_transaction++;
+
 	return LDB_SUCCESS;
 }
 
@@ -915,6 +917,8 @@ static int ltdb_end_trans(struct ldb_module *module)
 	struct ltdb_private *ltdb =
 		talloc_get_type(module->private_data, struct ltdb_private);
 
+	ltdb->in_transaction--;
+
 	if (tdb_transaction_commit(ltdb->tdb) != 0) {
 		return ltdb_err_map(tdb_error(ltdb->tdb));
 	}
@@ -927,6 +931,8 @@ static int ltdb_del_trans(struct ldb_module *module)
 	struct ltdb_private *ltdb =
 		talloc_get_type(module->private_data, struct ltdb_private);
 
+	ltdb->in_transaction--;
+
 	if (tdb_transaction_cancel(ltdb->tdb) != 0) {
 		return ltdb_err_map(tdb_error(ltdb->tdb));
 	}

source/lib/ldb/ldb_tdb/ldb_tdb.h

@@ -27,6 +27,8 @@ struct ltdb_private {
 			int flags;
 		} last_attribute;
 	} *cache;
+
+	int in_transaction;
 };
 
 /*