int ldb_map_modify(struct ldb_module *module, struct ldb_request *req)
{
	const struct ldb_message *msg = req->op.mod.message;
	struct ldb_request *search_req = NULL;
	struct ldb_message *remote_msg;
	struct ldb_context *ldb;
	struct map_context *ac;
	int ret;

	ldb = ldb_module_get_ctx(module);

	/* Do not manipulate our control entries */
	if (ldb_dn_is_special(msg->dn)) {
		return ldb_next_request(module, req);
	}

	/* No mapping requested (perhaps no DN mapping specified), skip to next module */
	if (!ldb_dn_check_local(module, msg->dn)) {
		return ldb_next_request(module, req);
	}

	/* No mapping needed, skip to next module */
	/* TODO: What if the remote part exists, the local doesn't,
	 *	 and this request wants to modify local data and thus
	 *	 add the local record? */
	if (!ldb_msg_check_remote(module, msg)) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	/* Prepare context and handle */
	ac = map_init_context(module, req);
	if (ac == NULL) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	/* Prepare the local message */
	ac->local_msg = ldb_msg_new(ac);
	if (ac->local_msg == NULL) {
		map_oom(module);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	ac->local_msg->dn = msg->dn;

	/* Prepare the remote message */
	remote_msg = ldb_msg_new(ac->remote_req);
	if (remote_msg == NULL) {
		map_oom(module);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	remote_msg->dn = ldb_dn_map_local(ac->module, remote_msg, msg->dn);

	/* Split local from remote message */
	ldb_msg_partition(module, req->operation, ac->local_msg, remote_msg, msg);

	/* Prepare the remote operation */
	ret = ldb_build_mod_req(&ac->remote_req, ldb,
				ac, remote_msg,
				req->controls,
				ac, map_op_remote_callback,
				req);
	LDB_REQ_SET_LOCATION(ac->remote_req);
	if (ret != LDB_SUCCESS) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	if ((ac->local_msg->num_elements == 0) ||
	    ( ! map_check_local_db(ac->module))) {
		/* No local data or db, just run the remote request */
		return ldb_next_remote_request(ac->module, ac->remote_req);
	}

	/* prepare the search operation */
	ret = map_search_self_req(&search_req, ac, msg->dn);
	if (ret != LDB_SUCCESS) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	return ldb_next_request(module, search_req);
}
int ldb_map_modify(struct ldb_module *module, struct ldb_request *req)
{
	const struct ldb_message *msg = req->op.mod.message;
	struct ldb_request *search_req = NULL;
	struct ldb_message *remote_msg;
	struct ldb_context *ldb;
	struct map_context *ac;
	int ret;

	ldb = ldb_module_get_ctx(module);

	 
	if (ldb_dn_is_special(msg->dn)) {
		return ldb_next_request(module, req);
	}

	 
	if (!ldb_dn_check_local(module, msg->dn)) {
		return ldb_next_request(module, req);
	}

	 
	 
	if (!ldb_msg_check_remote(module, msg)) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	 
	ac = map_init_context(module, req);
	if (ac == NULL) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	 
	ac->local_msg = ldb_msg_new(ac);
	if (ac->local_msg == NULL) {
		map_oom(module);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	ac->local_msg->dn = msg->dn;

	 
	remote_msg = ldb_msg_new(ac->remote_req);
	if (remote_msg == NULL) {
		map_oom(module);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	remote_msg->dn = ldb_dn_map_local(ac->module, remote_msg, msg->dn);

	 
	ldb_msg_partition(module, req->operation, ac->local_msg, remote_msg, msg);

	 
	ret = ldb_build_mod_req(&ac->remote_req, ldb,
				ac, remote_msg,
				req->controls,
				ac, map_op_remote_callback,
				req);
	LDB_REQ_SET_LOCATION(ac->remote_req);
	if (ret != LDB_SUCCESS) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	if ((ac->local_msg->num_elements == 0) ||
	    ( ! map_check_local_db(ac->module))) {
		 
		return ldb_next_remote_request(ac->module, ac->remote_req);
	}

	 
	ret = map_search_self_req(&search_req, ac, msg->dn);
	if (ret != LDB_SUCCESS) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	return ldb_next_request(module, search_req);
}