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diff --git a/source3/winbindd/idmap_rw.h b/source3/winbindd/idmap_rw.h
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+++ b/source3/winbindd/idmap_rw.h
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+/*
+ * Unix SMB/CIFS implementation.
+ *
+ * ID mapping: abstract r/w new-mapping mechanism
+ *
+ * Copyright (C) Michael Adam 2010
+ *
+ * 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/>.
+ */
+
+/*
+ * This module implements the abstract logic for creating a new
+ * SID<->Unix-ID mapping. It can be used by idmap backends that
+ * need to create mappings for unmapped SIDs upon request.
+ */
+
+#ifndef _IDMAP_RW_H_
+#define _IDMAP_RW_H_
+
+#include "includes.h"
+#include "idmap.h"
+
+struct idmap_rw_ops {
+	NTSTATUS (*get_new_id)(struct idmap_domain *dom, struct unixid *id);
+	NTSTATUS (*set_mapping)(struct idmap_domain *dom,
+				const struct id_map *map);
+};
+
+/**
+ * This is the abstract mechanism of creating a new mapping
+ * for a given SID. It is meant to be called called from an
+ * allocating backend from within idmap_<backend>_sids_to_unixids().
+ * It expects map->sid and map->xid.type to be set.
+ * Upon success, the new mapping is stored by the backend and
+ * map contains the new mapped xid.
+ *
+ * The caller has to take care of the necessary steps to
+ * guarantee atomicity of the operation, e.g. wrapping
+ * this call in a transaction if available.
+ */
+NTSTATUS idmap_rw_new_mapping(struct idmap_domain *dom,
+			      struct idmap_rw_ops *ops,
+			      struct id_map *map);
+
+#endif /* _IDMAP_RW_H_ */