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86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* The 'missing' vdev is a special vdev type used only during import. It
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* signifies a placeholder in the root vdev for some vdev that we know is
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* missing. We pass it down to the kernel to allow the rest of the
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* configuration to parsed and an attempt made to open all available devices.
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* Because its GUID is always 0, we know that the guid sum will mismatch and we
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* won't be able to open the pool anyway.
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*/
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#include <sys/zfs_context.h>
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#include <sys/spa.h>
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#include <sys/vdev_impl.h>
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#include <sys/fs/zfs.h>
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#include <sys/zio.h>
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/* ARGSUSED */
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static int
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vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift)
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{
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/*
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* Really this should just fail. But then the root vdev will be in the
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* faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is
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* VDEV_AUX_BAD_GUID_SUM. So we pretend to succeed, knowing that we
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* will fail the GUID sum check before ever trying to open the pool.
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*/
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*psize = SPA_MINDEVSIZE;
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*ashift = SPA_MINBLOCKSHIFT;
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return (0);
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}
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/* ARGSUSED */
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static void
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vdev_missing_close(vdev_t *vd)
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{
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}
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/* ARGSUSED */
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static int
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vdev_missing_io_start(zio_t *zio)
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{
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zio->io_error = ENOTSUP;
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return (ZIO_PIPELINE_CONTINUE);
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}
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/* ARGSUSED */
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static void
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vdev_missing_io_done(zio_t *zio)
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{
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}
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vdev_ops_t vdev_missing_ops = {
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vdev_missing_open,
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vdev_missing_close,
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vdev_default_asize,
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vdev_missing_io_start,
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vdev_missing_io_done,
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NULL,
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VDEV_TYPE_MISSING, /* name of this vdev type */
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B_TRUE /* leaf vdev */
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};
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