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diff --git a/fs/nilfs2/bmap_union.h b/fs/nilfs2/bmap_union.h
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+/*
+ * bmap_union.h - NILFS block mapping.
+ *
+ * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Written by Koji Sato <koji@osrg.net>.
+ */
+
+#ifndef _NILFS_BMAP_UNION_H
+#define _NILFS_BMAP_UNION_H
+
+#include "bmap.h"
+#include "direct.h"
+#include "btree.h"
+
+/**
+ * nilfs_bmap_union -
+ * @bi_bmap: bmap structure
+ * @bi_btree: direct map structure
+ * @bi_direct: B-tree structure
+ */
+union nilfs_bmap_union {
+	struct nilfs_bmap bi_bmap;
+	struct nilfs_direct bi_direct;
+	struct nilfs_btree bi_btree;
+};
+
+#endif	/* _NILFS_BMAP_UNION_H */