/*

 * 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 2006 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <sys/zfs_context.h>

#include <sys/spa.h>

#include <sys/vdev_impl.h>

#include <sys/zio.h>

#include <sys/fs/zfs.h>

/*

 * Virtual device vector for the pool's root vdev.

 */

static int

vdev_root_open(vdev_t *vd, uint64_t *asize, uint64_t *ashift)

{

	vdev_t *cvd;

	int c, error;

	int lasterror = 0;

	if (vd->vdev_children == 0) {

		vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;

		return (EINVAL);

	}

	for (c = 0; c < vd->vdev_children; c++) {

		cvd = vd->vdev_child[c];

		if ((error = vdev_open(cvd)) != 0) {

			lasterror = error;

			continue;

		}

		*asize += cvd->vdev_asize;

		*ashift = MAX(*ashift, cvd->vdev_ashift);

	}

	if (lasterror)

		vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS;

	return (lasterror);

}

static void

vdev_root_close(vdev_t *vd)

{

	int c;

	for (c = 0; c < vd->vdev_children; c++)

		vdev_close(vd->vdev_child[c]);

}

static void

vdev_root_state_change(vdev_t *vd, int faulted, int degraded)

{

	if (faulted > 0)

		vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,

		    VDEV_AUX_NO_REPLICAS);

	else if (degraded != 0)

		vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE);

	else

		vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE);

}

vdev_ops_t vdev_root_ops = {

	vdev_root_open,

	vdev_root_close,

	vdev_default_asize,

	NULL,			/* io_start - not applicable to the root */

	NULL,			/* io_done - not applicable to the root */

	vdev_root_state_change,

	VDEV_TYPE_ROOT,		/* name of this vdev type */

	B_FALSE			/* not a leaf vdev */

};