fs/zfs/vdev_root.c

	vdev_root.c revision fa9e4066f08beec538e775443c5be79dd423fcab
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2005 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, VDEV_STATE_CANT_OPEN, VDEV_AUX_NO_REPLICAS);
    else if (degraded != 0)
        vdev_set_state(vd, VDEV_STATE_DEGRADED, VDEV_AUX_NONE);
    else
        vdev_set_state(vd, 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 */
};