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Add xfs_io into xfsprogs, an xfs_db-alike program for the XFS IO path
which knows about direct IO, space preallocation, realtime files, etc
which the usual tools like dd don't unfortunately.  This is a fixed-up
version of a hacked tool that I found useful for coding, debugging and
testing unwritten extents; hopefully it'll be useful for realtime too.

/*
 * Copyright (c) 2003 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/
 */
 
extern int	fdesc;
extern char	*fname;
extern int	exitcode;
extern char	*progname;

extern int	readonly;
extern int	directio;
extern int	realtime;
extern int	append;
extern int	osync;
extern int	trunc;