/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

/*

 * The 'missing' vdev is a special vdev type used only during import.  It

 * signifies a placeholder in the root vdev for some vdev that we know is

 * missing.  We pass it down to the kernel to allow the rest of the

 * configuration to parsed and an attempt made to open all available devices.

 * Because its GUID is always 0, we know that the guid sum will mismatch and we

 * won't be able to open the pool anyway.

 */

#include <sys/zfs_context.h>

#include <sys/spa.h>

#include <sys/vdev_impl.h>

#include <sys/fs/zfs.h>

#include <sys/zio.h>

/* ARGSUSED */

static int

vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift)

{

	/*

	 * Really this should just fail.  But then the root vdev will be in the

	 * faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is

	 * VDEV_AUX_BAD_GUID_SUM.  So we pretend to succeed, knowing that we

	 * will fail the GUID sum check before ever trying to open the pool.

	 */

	*psize = 0;

	*ashift = 0;

	return (0);

}

/* ARGSUSED */

static void

vdev_missing_close(vdev_t *vd)

{

}

/* ARGSUSED */

static int

vdev_missing_io_start(zio_t *zio)

{

	zio->io_error = ENOTSUP;

	return (ZIO_PIPELINE_CONTINUE);

}

/* ARGSUSED */

static void

vdev_missing_io_done(zio_t *zio)

{

}

vdev_ops_t vdev_missing_ops = {

	vdev_missing_open,

	vdev_missing_close,

	vdev_default_asize,

	vdev_missing_io_start,

	vdev_missing_io_done,

	NULL,

	VDEV_TYPE_MISSING,	/* name of this vdev type */

	B_TRUE			/* leaf vdev */

};

vdev_ops_t vdev_hole_ops = {

	vdev_missing_open,

	vdev_missing_close,

	vdev_default_asize,

	vdev_missing_io_start,

	vdev_missing_io_done,

	NULL,

	VDEV_TYPE_HOLE,		/* name of this vdev type */

	B_TRUE			/* leaf vdev */

};