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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>
113 lines
3.5 KiB
C
113 lines
3.5 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 (c) 2016, Intel Corporation.
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* Copyright (c) 2020 by Lawrence Livermore National Security, LLC.
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*/
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#ifndef _SYS_VDEV_DRAID_H
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#define _SYS_VDEV_DRAID_H
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#include <sys/types.h>
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#include <sys/abd.h>
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#include <sys/nvpair.h>
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#include <sys/zio.h>
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#include <sys/vdev_impl.h>
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#include <sys/vdev_raidz_impl.h>
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#include <sys/vdev.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Constants required to generate and use dRAID permutations.
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*/
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#define VDEV_DRAID_SEED 0xd7a1d5eed
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#define VDEV_DRAID_MAX_MAPS 254
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#define VDEV_DRAID_ROWSHIFT SPA_MAXBLOCKSHIFT
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#define VDEV_DRAID_ROWHEIGHT (1ULL << VDEV_DRAID_ROWSHIFT)
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#define VDEV_DRAID_REFLOW_RESERVE (2 * VDEV_DRAID_ROWHEIGHT)
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/*
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* dRAID permutation map.
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*/
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typedef struct draid_map {
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uint64_t dm_children; /* # of permutation columns */
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uint64_t dm_nperms; /* # of permutation rows */
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uint64_t dm_seed; /* dRAID map seed */
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uint64_t dm_checksum; /* Checksum of generated map */
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uint8_t *dm_perms; /* base permutation array */
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} draid_map_t;
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/*
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* dRAID configuration.
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*/
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typedef struct vdev_draid_config {
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/*
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* Values read from the dRAID nvlist configuration.
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*/
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uint64_t vdc_ndata; /* # of data devices in group */
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uint64_t vdc_nparity; /* # of parity devices in group */
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uint64_t vdc_nspares; /* # of distributed spares */
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uint64_t vdc_children; /* # of children */
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uint64_t vdc_ngroups; /* # groups per slice */
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/*
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* Immutable derived constants.
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*/
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uint8_t *vdc_perms; /* permutation array */
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uint64_t vdc_nperms; /* # of permutations */
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uint64_t vdc_groupwidth; /* = data + parity */
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uint64_t vdc_ndisks; /* = children - spares */
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uint64_t vdc_groupsz; /* = groupwidth * DRAID_ROWSIZE */
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uint64_t vdc_devslicesz; /* = (groupsz * groups) / ndisks */
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} vdev_draid_config_t;
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/*
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* Functions for handling dRAID permutation maps.
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*/
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extern uint64_t vdev_draid_rand(uint64_t *);
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extern int vdev_draid_lookup_map(uint64_t, const draid_map_t **);
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extern int vdev_draid_generate_perms(const draid_map_t *, uint8_t **);
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/*
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* General dRAID support functions.
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*/
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extern boolean_t vdev_draid_readable(vdev_t *, uint64_t);
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extern boolean_t vdev_draid_missing(vdev_t *, uint64_t, uint64_t, uint64_t);
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extern uint64_t vdev_draid_asize_to_psize(vdev_t *, uint64_t, uint64_t);
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extern void vdev_draid_map_alloc_empty(zio_t *, struct raidz_row *);
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extern int vdev_draid_map_verify_empty(zio_t *, struct raidz_row *);
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extern nvlist_t *vdev_draid_read_config_spare(vdev_t *);
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/* Functions for dRAID distributed spares. */
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extern vdev_t *vdev_draid_spare_get_child(vdev_t *, uint64_t);
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extern vdev_t *vdev_draid_spare_get_parent(vdev_t *);
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extern int vdev_draid_spare_create(nvlist_t *, vdev_t *, uint64_t *, uint64_t);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_VDEV_DRAID_H */
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