vdev_missing.c

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/*
 * 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/fs/zfs.h>
#include <sys/zio.h>

/* ARGSUSED */
static int
vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *max_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;
        *max_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,
        NULL,
        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,
        NULL,
        NULL,
        VDEV_TYPE_HOLE,         /* name of this vdev type */
        B_TRUE                  /* leaf vdev */
};