vdev_root.c

Go to the documentation of this file.

/*
 * 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 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Copyright (c) 2012 by Delphix. All rights reserved.
 */

#include <sys/zfs_context.h>
#include <sys/spa.h>
#include <sys/vdev_impl.h>
#include <sys/zio.h>
#include <sys/fs/zfs.h>

static int
too_many_errors(vdev_t *vd, int numerrors)
{
        ASSERT3U(numerrors, <=, vd->vdev_children);
        return (numerrors > 0);
}

static int
vdev_root_open(vdev_t *vd, uint64_t *asize, uint64_t *max_asize,
    uint64_t *ashift)
{
        int lasterror = 0;
        int numerrors = 0;

        if (vd->vdev_children == 0) {
                vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
                return (EINVAL);
        }

        vdev_open_children(vd);

        for (int c = 0; c < vd->vdev_children; c++) {
                vdev_t *cvd = vd->vdev_child[c];

                if (cvd->vdev_open_error && !cvd->vdev_islog) {
                        lasterror = cvd->vdev_open_error;
                        numerrors++;
                }
        }

        if (too_many_errors(vd, numerrors)) {
                vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS;
                return (lasterror);
        }

        *asize = 0;
        *max_asize = 0;
        *ashift = 0;

        return (0);
}

static void
vdev_root_close(vdev_t *vd)
{
        for (int 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 (too_many_errors(vd, faulted)) {
                vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
                    VDEV_AUX_NO_REPLICAS);
        } else if (degraded) {
                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,
        NULL,
        NULL,
        VDEV_TYPE_ROOT,         /* name of this vdev type */
        B_FALSE                 /* not a leaf vdev */
};