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246e5883bb
When forced to resort to ganging, ZFS currently allocates three child blocks, each one third of the size of the original. This is true regardless of whether larger allocations could be made, which would allow us to have fewer gang leaves. This improves performance when fragmentation is high enough to require ganging, but not so high that all the free ranges are only just big enough to hold a third of the recordsize. This is also useful for improving the behavior of a future change to allow larger gang headers. We add the ability for the allocation codepath to allocate a range of sizes instead of a single fixed size. We then use this to pre-allocate the DVAs for the gang children. If those allocations fail, we fall back to the normal write path, which will likely re-gang. Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com> Co-authored-by: Paul Dagnelie <paul.dagnelie@klarasystems.com> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Tony Hutter <hutter2@llnl.gov>
134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
// SPDX-License-Identifier: CDDL-1.0
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/*
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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 https://opensource.org/licenses/CDDL-1.0.
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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, 2016 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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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, uint64_t *pshift)
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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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(void) vd;
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*psize = 0;
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*max_psize = 0;
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*ashift = 0;
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*pshift = 0;
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return (0);
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}
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static void
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vdev_missing_close(vdev_t *vd)
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{
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(void) vd;
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}
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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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static void
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vdev_missing_io_done(zio_t *zio)
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{
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(void) zio;
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}
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vdev_ops_t vdev_missing_ops = {
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.vdev_op_init = NULL,
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.vdev_op_fini = NULL,
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.vdev_op_open = vdev_missing_open,
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.vdev_op_close = vdev_missing_close,
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.vdev_op_psize_to_asize = vdev_default_asize,
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.vdev_op_asize_to_psize = vdev_default_psize,
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.vdev_op_min_asize = vdev_default_min_asize,
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.vdev_op_min_alloc = NULL,
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.vdev_op_io_start = vdev_missing_io_start,
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.vdev_op_io_done = vdev_missing_io_done,
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.vdev_op_state_change = NULL,
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.vdev_op_need_resilver = NULL,
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.vdev_op_hold = NULL,
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.vdev_op_rele = NULL,
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.vdev_op_remap = NULL,
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.vdev_op_xlate = NULL,
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.vdev_op_rebuild_asize = NULL,
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.vdev_op_metaslab_init = NULL,
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.vdev_op_config_generate = NULL,
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.vdev_op_nparity = NULL,
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.vdev_op_ndisks = NULL,
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.vdev_op_type = VDEV_TYPE_MISSING, /* name of this vdev type */
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.vdev_op_leaf = B_TRUE /* leaf vdev */
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};
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vdev_ops_t vdev_hole_ops = {
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.vdev_op_init = NULL,
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.vdev_op_fini = NULL,
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.vdev_op_open = vdev_missing_open,
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.vdev_op_close = vdev_missing_close,
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.vdev_op_psize_to_asize = vdev_default_asize,
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.vdev_op_asize_to_psize = vdev_default_psize,
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.vdev_op_min_asize = vdev_default_min_asize,
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.vdev_op_min_alloc = NULL,
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.vdev_op_io_start = vdev_missing_io_start,
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.vdev_op_io_done = vdev_missing_io_done,
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.vdev_op_state_change = NULL,
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.vdev_op_need_resilver = NULL,
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.vdev_op_hold = NULL,
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.vdev_op_rele = NULL,
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.vdev_op_remap = NULL,
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.vdev_op_xlate = NULL,
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.vdev_op_rebuild_asize = NULL,
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.vdev_op_metaslab_init = NULL,
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.vdev_op_config_generate = NULL,
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.vdev_op_nparity = NULL,
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.vdev_op_ndisks = NULL,
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.vdev_op_type = VDEV_TYPE_HOLE, /* name of this vdev type */
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.vdev_op_leaf = B_TRUE /* leaf vdev */
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};
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