diff options
Diffstat (limited to 'include/sys/vdev_draid.h')
| -rw-r--r-- | include/sys/vdev_draid.h | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/include/sys/vdev_draid.h b/include/sys/vdev_draid.h new file mode 100644 index 000000000..65417a93c --- /dev/null +++ b/include/sys/vdev_draid.h @@ -0,0 +1,110 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright (c) 2016, Intel Corporation. + * Copyright (c) 2020 by Lawrence Livermore National Security, LLC. + */ + +#ifndef _SYS_VDEV_DRAID_H +#define _SYS_VDEV_DRAID_H + +#include <sys/types.h> +#include <sys/abd.h> +#include <sys/nvpair.h> +#include <sys/zio.h> +#include <sys/vdev_impl.h> +#include <sys/vdev_raidz_impl.h> +#include <sys/vdev.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * Constants required to generate and use dRAID permutations. + */ +#define VDEV_DRAID_SEED 0xd7a1d5eed +#define VDEV_DRAID_MAX_MAPS 254 +#define VDEV_DRAID_ROWSHIFT SPA_MAXBLOCKSHIFT +#define VDEV_DRAID_ROWHEIGHT (1ULL << VDEV_DRAID_ROWSHIFT) +#define VDEV_DRAID_REFLOW_RESERVE (2 * VDEV_DRAID_ROWHEIGHT) + +/* + * dRAID permutation map. + */ +typedef struct draid_map { + uint64_t dm_children; /* # of permuation columns */ + uint64_t dm_nperms; /* # of permutation rows */ + uint64_t dm_seed; /* dRAID map seed */ + uint64_t dm_checksum; /* Checksum of generated map */ + uint8_t *dm_perms; /* base permutation array */ +} draid_map_t; + +/* + * dRAID configuration. + */ +typedef struct vdev_draid_config { + /* + * Values read from the dRAID nvlist configuration. + */ + uint64_t vdc_ndata; /* # of data devices in group */ + uint64_t vdc_nparity; /* # of parity devices in group */ + uint64_t vdc_nspares; /* # of distributed spares */ + uint64_t vdc_children; /* # of children */ + uint64_t vdc_ngroups; /* # groups per slice */ + + /* + * Immutable derived constants. + */ + uint8_t *vdc_perms; /* permutation array */ + uint64_t vdc_nperms; /* # of permutations */ + uint64_t vdc_groupwidth; /* = data + parity */ + uint64_t vdc_ndisks; /* = children - spares */ + uint64_t vdc_groupsz; /* = groupwidth * DRAID_ROWSIZE */ + uint64_t vdc_devslicesz; /* = (groupsz * groups) / ndisks */ +} vdev_draid_config_t; + +/* + * Functions for handling dRAID permutation maps. + */ +extern uint64_t vdev_draid_rand(uint64_t *); +extern int vdev_draid_lookup_map(uint64_t, const draid_map_t **); +extern int vdev_draid_generate_perms(const draid_map_t *, uint8_t **); + +/* + * General dRAID support functions. + */ +extern boolean_t vdev_draid_readable(vdev_t *, uint64_t); +extern boolean_t vdev_draid_missing(vdev_t *, uint64_t, uint64_t, uint64_t); +extern uint64_t vdev_draid_asize_to_psize(vdev_t *, uint64_t); +extern void vdev_draid_map_alloc_empty(zio_t *, struct raidz_row *); +extern nvlist_t *vdev_draid_read_config_spare(vdev_t *); + +/* Functions for dRAID distributed spares. */ +extern vdev_t *vdev_draid_spare_get_child(vdev_t *, uint64_t); +extern vdev_t *vdev_draid_spare_get_parent(vdev_t *); +extern int vdev_draid_spare_create(nvlist_t *, vdev_t *, uint64_t *, uint64_t); + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_VDEV_DRAID_H */ |