zfs/include/spl/sys/dkio.h

/*
 *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
 *  Copyright (C) 2007 The Regents of the University of California.
 *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
 *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
 *  UCRL-CODE-235197
 *
 *  This file is part of the SPL, Solaris Porting Layer.
 *  For details, see <http://zfsonlinux.org/>.
 *
 *  The SPL 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.
 *
 *  The SPL 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 the SPL.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _SPL_DKIO_H
#define	_SPL_DKIO_H

#define	DFL_SZ(num_exts) \
	(sizeof (dkioc_free_list_t) + (num_exts - 1) * 16)

#define	DKIOC		(0x04 << 8)
#define	DKIOCFLUSHWRITECACHE	(DKIOC|34)	/* flush cache to phys medium */

/*
 * ioctl to free space (e.g. SCSI UNMAP) off a disk.
 * Pass a dkioc_free_list_t containing a list of extents to be freed.
 */
#define	DKIOCFREE	(DKIOC|50)

#endif /* _SPL_DKIO_H */