diff --git a/fs/xfs/xfs_dir.h b/fs/xfs/xfs_dir.h
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+++ b/fs/xfs/xfs_dir.h
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+/*
+ * 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_DIR_H__
+#define	__XFS_DIR_H__
+
+/*
+ * Large directories are structured around Btrees where all the data
+ * elements are in the leaf nodes.  Filenames are hashed into an int,
+ * then that int is used as the index into the Btree.  Since the hashval
+ * of a filename may not be unique, we may have duplicate keys.  The
+ * internal links in the Btree are logical block offsets into the file.
+ *
+ * Small directories use a different format and are packed as tightly
+ * as possible so as to fit into the literal area of the inode.
+ */
+
+/*========================================================================
+ * Function prototypes for the kernel.
+ *========================================================================*/
+
+struct uio;
+struct xfs_bmap_free;
+struct xfs_da_args;
+struct xfs_dinode;
+struct xfs_inode;
+struct xfs_mount;
+struct xfs_trans;
+
+/*
+ * Directory function types.
+ * Put in structures (xfs_dirops_t) for v1 and v2 directories.
+ */
+typedef void	(*xfs_dir_mount_t)(struct xfs_mount *mp);
+typedef int	(*xfs_dir_isempty_t)(struct xfs_inode *dp);
+typedef int	(*xfs_dir_init_t)(struct xfs_trans *tp,
+				  struct xfs_inode *dp,
+				  struct xfs_inode *pdp);
+typedef int	(*xfs_dir_createname_t)(struct xfs_trans *tp,
+					struct xfs_inode *dp,
+					char *name,
+					int namelen,
+					xfs_ino_t inum,
+					xfs_fsblock_t *first,
+					struct xfs_bmap_free *flist,
+					xfs_extlen_t total);
+typedef int	(*xfs_dir_lookup_t)(struct xfs_trans *tp,
+				    struct xfs_inode *dp,
+				    char *name,
+				    int namelen,
+				    xfs_ino_t *inum);
+typedef int	(*xfs_dir_removename_t)(struct xfs_trans *tp,
+					struct xfs_inode *dp,
+					char *name,
+					int namelen,
+					xfs_ino_t ino,
+					xfs_fsblock_t *first,
+					struct xfs_bmap_free *flist,
+					xfs_extlen_t total);
+typedef int	(*xfs_dir_getdents_t)(struct xfs_trans *tp,
+				      struct xfs_inode *dp,
+				      struct uio *uio,
+				      int *eofp);
+typedef int	(*xfs_dir_replace_t)(struct xfs_trans *tp,
+				     struct xfs_inode *dp,
+				     char *name,
+				     int namelen,
+				     xfs_ino_t inum,
+				     xfs_fsblock_t *first,
+				     struct xfs_bmap_free *flist,
+				     xfs_extlen_t total);
+typedef int	(*xfs_dir_canenter_t)(struct xfs_trans *tp,
+				      struct xfs_inode *dp,
+				      char *name,
+				      int namelen);
+typedef int	(*xfs_dir_shortform_validate_ondisk_t)(struct xfs_mount *mp,
+						       struct xfs_dinode *dip);
+typedef int	(*xfs_dir_shortform_to_single_t)(struct xfs_da_args *args);
+
+typedef struct xfs_dirops {
+	xfs_dir_mount_t				xd_mount;
+	xfs_dir_isempty_t			xd_isempty;
+	xfs_dir_init_t				xd_init;
+	xfs_dir_createname_t			xd_createname;
+	xfs_dir_lookup_t			xd_lookup;
+	xfs_dir_removename_t			xd_removename;
+	xfs_dir_getdents_t			xd_getdents;
+	xfs_dir_replace_t			xd_replace;
+	xfs_dir_canenter_t			xd_canenter;
+	xfs_dir_shortform_validate_ondisk_t	xd_shortform_validate_ondisk;
+	xfs_dir_shortform_to_single_t		xd_shortform_to_single;
+} xfs_dirops_t;
+
+/*
+ * Overall external interface routines.
+ */
+void	xfs_dir_startup(void);	/* called exactly once */
+
+#define	XFS_DIR_MOUNT(mp)	\
+	((mp)->m_dirops.xd_mount(mp))
+#define	XFS_DIR_ISEMPTY(mp,dp)	\
+	((mp)->m_dirops.xd_isempty(dp))
+#define	XFS_DIR_INIT(mp,tp,dp,pdp)	\
+	((mp)->m_dirops.xd_init(tp,dp,pdp))
+#define	XFS_DIR_CREATENAME(mp,tp,dp,name,namelen,inum,first,flist,total) \
+	((mp)->m_dirops.xd_createname(tp,dp,name,namelen,inum,first,flist,\
+				      total))
+#define	XFS_DIR_LOOKUP(mp,tp,dp,name,namelen,inum)	\
+	((mp)->m_dirops.xd_lookup(tp,dp,name,namelen,inum))
+#define	XFS_DIR_REMOVENAME(mp,tp,dp,name,namelen,ino,first,flist,total)	\
+	((mp)->m_dirops.xd_removename(tp,dp,name,namelen,ino,first,flist,total))
+#define	XFS_DIR_GETDENTS(mp,tp,dp,uio,eofp)	\
+	((mp)->m_dirops.xd_getdents(tp,dp,uio,eofp))
+#define	XFS_DIR_REPLACE(mp,tp,dp,name,namelen,inum,first,flist,total)	\
+	((mp)->m_dirops.xd_replace(tp,dp,name,namelen,inum,first,flist,total))
+#define	XFS_DIR_CANENTER(mp,tp,dp,name,namelen)	\
+	((mp)->m_dirops.xd_canenter(tp,dp,name,namelen))
+#define	XFS_DIR_SHORTFORM_VALIDATE_ONDISK(mp,dip)	\
+	((mp)->m_dirops.xd_shortform_validate_ondisk(mp,dip))
+#define	XFS_DIR_SHORTFORM_TO_SINGLE(mp,args)	\
+	((mp)->m_dirops.xd_shortform_to_single(args))
+
+#define	XFS_DIR_IS_V1(mp)	((mp)->m_dirversion == 1)
+extern xfs_dirops_t xfsv1_dirops;
+
+#endif	/* __XFS_DIR_H__ */