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Add XFS_FS_GOINGDOWN ioctl to xfs.
My motivation is for log recovery testing.
Prototype for xfs_fs_goingdown() defined in xfs_fsops.c.

/*
 * Copyright (c) 2000-2001 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_FSOPS_H__
#define	__XFS_FSOPS_H__

int
xfs_fs_geometry(
	xfs_mount_t		*mp,
	xfs_fsop_geom_t		*geo,
	int			new_version);

int
xfs_growfs_data(
	xfs_mount_t		*mp,
	xfs_growfs_data_t	*in);

int
xfs_growfs_log(
	xfs_mount_t		*mp,
	xfs_growfs_log_t	*in);

int
xfs_fs_counts(
	xfs_mount_t		*mp,
	xfs_fsop_counts_t	*cnt);

int
xfs_reserve_blocks(
	xfs_mount_t		*mp,
	__uint64_t		*inval,
	xfs_fsop_resblks_t	*outval);

int
xfs_fs_freeze(
	xfs_mount_t		*mp);

int
xfs_fs_thaw(
	xfs_mount_t		*mp);

int
xfs_fs_goingdown(
	xfs_mount_t		*mp,
	__uint32_t		inflags);

#endif	/* __XFS_FSOPS_H__ */