3d6da72d18
On a raidz vdev, a block that does not span all child vdevs, excluding its skip sectors if any, may not be affected by a child vdev outage or failure. In such cases, the block does not need to be resilvered. However, current resilver algorithm simply resilvers all blocks on a degraded raidz vdev. Such spurious IO is not only wasteful, but also adds the risk of overwriting good data. This patch eliminates such spurious IOs. Reviewed-by: Gvozden Neskovic <neskovic@gmail.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed by: Matthew Ahrens <mahrens@delphix.com> Signed-off-by: Isaac Huang <he.huang@intel.com> Closes #5316
109 lines
2.7 KiB
C
109 lines
2.7 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 2010 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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* Copyright (c) 2012, 2014 by Delphix. All rights reserved.
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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 *max_psize,
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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 = 0;
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*max_psize = 0;
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*ashift = 0;
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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 void
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vdev_missing_io_start(zio_t *zio)
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{
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zio->io_error = SET_ERROR(ENOTSUP);
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zio_execute(zio);
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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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NULL,
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NULL,
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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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vdev_ops_t vdev_hole_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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NULL,
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NULL,
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NULL,
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VDEV_TYPE_HOLE, /* name of this vdev type */
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B_TRUE /* leaf vdev */
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};
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