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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | /* -*- linux-c -*- ------------------------------------------------------- * * * Copyright 2003 H. Peter Anvin - All Rights Reserved * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, Inc., 53 Temple Place Ste 330, * Bostom MA 02111-1307, USA; either version 2 of the License, or * (at your option) any later version; incorporated herein by reference. * * ----------------------------------------------------------------------- */ #ifndef LINUX_RAID_RAID6_H #define LINUX_RAID_RAID6_H #ifdef __KERNEL__ /* Set to 1 to use kernel-wide empty_zero_page */ #define RAID6_USE_EMPTY_ZERO_PAGE 0 #include <linux/module.h> #include <linux/stddef.h> #include <linux/compiler.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/mempool.h> #include <linux/list.h> #include <linux/vmalloc.h> #include <linux/raid/md.h> #include <linux/raid/raid5.h> typedef raid5_conf_t raid6_conf_t; /* Same configuration */ /* Additional compute_parity mode -- updates the parity w/o LOCKING */ #define UPDATE_PARITY 4 /* We need a pre-zeroed page... if we don't want to use the kernel-provided one define it here */ #if RAID6_USE_EMPTY_ZERO_PAGE # define raid6_empty_zero_page empty_zero_page #else extern const char raid6_empty_zero_page[PAGE_SIZE]; #endif #else /* ! __KERNEL__ */ /* Used for testing in user space */ #include <errno.h> #include <inttypes.h> #include <limits.h> #include <stddef.h> #include <sys/mman.h> #include <sys/types.h> /* Not standard, but glibc defines it */ #define BITS_PER_LONG __WORDSIZE typedef uint8_t u8; typedef uint16_t u16; typedef uint32_t u32; typedef uint64_t u64; #ifndef PAGE_SIZE # define PAGE_SIZE 4096 #endif extern const char raid6_empty_zero_page[PAGE_SIZE]; #define __init #define __exit #define __attribute_const__ __attribute__((const)) #define noinline __attribute__((noinline)) #define preempt_enable() #define preempt_disable() #define cpu_has_feature(x) 1 #define enable_kernel_altivec() #define disable_kernel_altivec() #endif /* __KERNEL__ */ /* Routine choices */ struct raid6_calls { void (*gen_syndrome)(int, size_t, void **); int (*valid)(void); /* Returns 1 if this routine set is usable */ const char *name; /* Name of this routine set */ int prefer; /* Has special performance attribute */ }; /* Selected algorithm */ extern struct raid6_calls raid6_call; /* Algorithm list */ extern const struct raid6_calls * const raid6_algos[]; int raid6_select_algo(void); /* Return values from chk_syndrome */ #define RAID6_OK 0 #define RAID6_P_BAD 1 #define RAID6_Q_BAD 2 #define RAID6_PQ_BAD 3 /* Galois field tables */ extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); /* Recovery routines */ void raid6_2data_recov(int disks, size_t bytes, int faila, int failb, void **ptrs); void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs); void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, void **ptrs); /* Some definitions to allow code to be compiled for testing in userspace */ #ifndef __KERNEL__ # define jiffies raid6_jiffies() # define printk printf # define GFP_KERNEL 0 # define __get_free_pages(x,y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0)) # define free_pages(x,y) munmap((void *)(x), (y)*PAGE_SIZE) static inline void cpu_relax(void) { /* Nothing */ } #undef HZ #define HZ 1000 static inline uint32_t raid6_jiffies(void) { struct timeval tv; gettimeofday(&tv, NULL); return tv.tv_sec*1000 + tv.tv_usec/1000; } #endif /* ! __KERNEL__ */ #endif /* LINUX_RAID_RAID6_H */ |