111 lines
3.4 KiB
C
111 lines
3.4 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 (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);
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extern void vdev_draid_map_alloc_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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