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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 2008 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 = SPA_MINDEVSIZE;
*ashift = SPA_MINBLOCKSHIFT;
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 */
};
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