131 строка
3.6 KiB
C
131 строка
3.6 KiB
C
/* -*- linux-c -*- ------------------------------------------------------- *
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*
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* Copyright 2003 H. Peter Anvin - All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
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* Bostom MA 02111-1307, USA; either version 2 of the License, or
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* (at your option) any later version; incorporated herein by reference.
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*
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* ----------------------------------------------------------------------- */
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#ifndef LINUX_RAID_RAID6_H
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#define LINUX_RAID_RAID6_H
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#ifdef __KERNEL__
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/* Set to 1 to use kernel-wide empty_zero_page */
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#define RAID6_USE_EMPTY_ZERO_PAGE 0
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#include <linux/raid/md.h>
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#include <linux/raid/raid5.h>
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typedef raid5_conf_t raid6_conf_t; /* Same configuration */
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/* Additional compute_parity mode -- updates the parity w/o LOCKING */
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#define UPDATE_PARITY 4
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/* We need a pre-zeroed page... if we don't want to use the kernel-provided
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one define it here */
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#if RAID6_USE_EMPTY_ZERO_PAGE
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# define raid6_empty_zero_page empty_zero_page
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#else
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extern const char raid6_empty_zero_page[PAGE_SIZE];
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#endif
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#else /* ! __KERNEL__ */
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/* Used for testing in user space */
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#include <errno.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <stddef.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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/* Not standard, but glibc defines it */
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#define BITS_PER_LONG __WORDSIZE
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typedef uint8_t u8;
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typedef uint16_t u16;
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typedef uint32_t u32;
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typedef uint64_t u64;
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#ifndef PAGE_SIZE
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# define PAGE_SIZE 4096
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#endif
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extern const char raid6_empty_zero_page[PAGE_SIZE];
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#define __init
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#define __exit
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#define __attribute_const__ __attribute__((const))
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#define noinline __attribute__((noinline))
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#define preempt_enable()
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#define preempt_disable()
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#define cpu_has_feature(x) 1
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#define enable_kernel_altivec()
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#define disable_kernel_altivec()
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#endif /* __KERNEL__ */
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/* Routine choices */
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struct raid6_calls {
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void (*gen_syndrome)(int, size_t, void **);
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int (*valid)(void); /* Returns 1 if this routine set is usable */
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const char *name; /* Name of this routine set */
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int prefer; /* Has special performance attribute */
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};
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/* Selected algorithm */
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extern struct raid6_calls raid6_call;
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/* Algorithm list */
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extern const struct raid6_calls * const raid6_algos[];
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int raid6_select_algo(void);
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/* Return values from chk_syndrome */
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#define RAID6_OK 0
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#define RAID6_P_BAD 1
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#define RAID6_Q_BAD 2
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#define RAID6_PQ_BAD 3
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/* Galois field tables */
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extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
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extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
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extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
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extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
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/* Recovery routines */
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void raid6_2data_recov(int disks, size_t bytes, int faila, int failb, void **ptrs);
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void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs);
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void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, void **ptrs);
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/* Some definitions to allow code to be compiled for testing in userspace */
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#ifndef __KERNEL__
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# define jiffies raid6_jiffies()
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# define printk printf
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# define GFP_KERNEL 0
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# define __get_free_pages(x,y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0))
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# define free_pages(x,y) munmap((void *)(x), (y)*PAGE_SIZE)
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static inline void cpu_relax(void)
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{
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/* Nothing */
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}
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#undef HZ
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#define HZ 1000
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static inline uint32_t raid6_jiffies(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv.tv_sec*1000 + tv.tv_usec/1000;
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}
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#endif /* ! __KERNEL__ */
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#endif /* LINUX_RAID_RAID6_H */
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