| /* |
| * 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 permutation 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 int vdev_draid_map_verify_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 */ |