133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
/* -*- 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,
|
|
* Boston 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/blkdev.h>
|
|
|
|
/* 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()
|
|
|
|
#define EXPORT_SYMBOL(sym)
|
|
#define MODULE_LICENSE(licence)
|
|
#define subsys_initcall(x)
|
|
#define module_exit(x)
|
|
#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 */
|