diff --git a/fs/xfs/xfs_dir2_node.h b/fs/xfs/xfs_dir2_node.h
new file mode 100644
index 0000000..96db420
--- /dev/null
+++ b/fs/xfs/xfs_dir2_node.h
@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+#ifndef __XFS_DIR2_NODE_H__
+#define	__XFS_DIR2_NODE_H__
+
+/*
+ * Directory version 2, btree node format structures
+ */
+
+struct uio;
+struct xfs_dabuf;
+struct xfs_da_args;
+struct xfs_da_state;
+struct xfs_da_state_blk;
+struct xfs_inode;
+struct xfs_trans;
+
+/*
+ * Constants.
+ */
+
+/*
+ * Offset of the freespace index.
+ */
+#define	XFS_DIR2_FREE_SPACE	2
+#define	XFS_DIR2_FREE_OFFSET	(XFS_DIR2_FREE_SPACE * XFS_DIR2_SPACE_SIZE)
+#define	XFS_DIR2_FREE_FIRSTDB(mp)	\
+	XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_FREE_OFFSET)
+
+#define	XFS_DIR2_FREE_MAGIC	0x58443246	/* XD2F */
+
+/*
+ * Structures.
+ */
+typedef	struct xfs_dir2_free_hdr {
+	__uint32_t		magic;		/* XFS_DIR2_FREE_MAGIC */
+	__int32_t		firstdb;	/* db of first entry */
+	__int32_t		nvalid;		/* count of valid entries */
+	__int32_t		nused;		/* count of used entries */
+} xfs_dir2_free_hdr_t;
+
+typedef struct xfs_dir2_free {
+	xfs_dir2_free_hdr_t	hdr;		/* block header */
+	xfs_dir2_data_off_t	bests[1];	/* best free counts */
+						/* unused entries are -1 */
+} xfs_dir2_free_t;
+#define	XFS_DIR2_MAX_FREE_BESTS(mp)	\
+	(((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_free_hdr_t)) / \
+	 (uint)sizeof(xfs_dir2_data_off_t))
+
+/*
+ * Macros.
+ */
+
+/*
+ * Convert data space db to the corresponding free db.
+ */
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_TO_FDB)
+xfs_dir2_db_t
+xfs_dir2_db_to_fdb(struct xfs_mount *mp, xfs_dir2_db_t db);
+#define	XFS_DIR2_DB_TO_FDB(mp,db)	xfs_dir2_db_to_fdb(mp, db)
+#else
+#define	XFS_DIR2_DB_TO_FDB(mp,db)	\
+	(XFS_DIR2_FREE_FIRSTDB(mp) + (db) / XFS_DIR2_MAX_FREE_BESTS(mp))
+#endif
+
+/*
+ * Convert data space db to the corresponding index in a free db.
+ */
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_TO_FDINDEX)
+int
+xfs_dir2_db_to_fdindex(struct xfs_mount *mp, xfs_dir2_db_t db);
+#define	XFS_DIR2_DB_TO_FDINDEX(mp,db)	xfs_dir2_db_to_fdindex(mp, db)
+#else
+#define	XFS_DIR2_DB_TO_FDINDEX(mp,db)	((db) % XFS_DIR2_MAX_FREE_BESTS(mp))
+#endif
+
+/*
+ * Functions.
+ */
+
+extern void
+	xfs_dir2_free_log_bests(struct xfs_trans *tp, struct xfs_dabuf *bp,
+				int first, int last);
+
+extern int
+	xfs_dir2_leaf_to_node(struct xfs_da_args *args, struct xfs_dabuf *lbp);
+
+extern xfs_dahash_t
+	xfs_dir2_leafn_lasthash(struct xfs_dabuf *bp, int *count);
+
+extern int
+	xfs_dir2_leafn_lookup_int(struct xfs_dabuf *bp,
+				  struct xfs_da_args *args, int *indexp,
+				  struct xfs_da_state *state);
+
+extern int
+	xfs_dir2_leafn_order(struct xfs_dabuf *leaf1_bp,
+			     struct xfs_dabuf *leaf2_bp);
+
+extern int
+	xfs_dir2_leafn_split(struct xfs_da_state *state,
+			     struct xfs_da_state_blk *oldblk,
+			     struct xfs_da_state_blk *newblk);
+
+extern int
+	xfs_dir2_leafn_toosmall(struct xfs_da_state *state, int *action);
+
+extern void
+	xfs_dir2_leafn_unbalance(struct xfs_da_state *state,
+				 struct xfs_da_state_blk *drop_blk,
+				 struct xfs_da_state_blk *save_blk);
+
+extern int
+	xfs_dir2_node_addname(struct xfs_da_args *args);
+
+extern int
+	xfs_dir2_node_lookup(struct xfs_da_args *args);
+
+extern int
+	xfs_dir2_node_removename(struct xfs_da_args *args);
+
+extern int
+	xfs_dir2_node_replace(struct xfs_da_args *args);
+
+extern int
+	xfs_dir2_node_trim_free(struct xfs_da_args *args, xfs_fileoff_t fo,
+				int *rvalp);
+
+#endif	/* __XFS_DIR2_NODE_H__ */