1 /* -*- linux-c -*- ------------------------------------------------------- *
2 *
3 * Copyright 2003 H. Peter Anvin - All Rights Reserved
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, Inc., 53 Temple Place Ste 330,
8 * Bostom MA 02111-1307, USA; either version 2 of the License, or
9 * (at your option) any later version; incorporated herein by reference.
10 *
11 * ----------------------------------------------------------------------- */
12
13 #ifndef LINUX_RAID_RAID6_H
14 #define LINUX_RAID_RAID6_H
15
16 #ifdef __KERNEL__
17
18 /* Set to 1 to use kernel-wide empty_zero_page */
19 #define RAID6_USE_EMPTY_ZERO_PAGE 0
20
21 #include <linux/module.h>
22 #include <linux/stddef.h>
23 #include <linux/compiler.h>
24 #include <linux/types.h>
25 #include <linux/kernel.h>
26 #include <linux/errno.h>
27 #include <linux/mempool.h>
28 #include <linux/list.h>
29 #include <linux/vmalloc.h>
30 #include <linux/raid/md.h>
31 #include <linux/raid/raid5.h>
32
33 typedef raid5_conf_t raid6_conf_t; /* Same configuration */
34
35 /* Additional compute_parity mode -- updates the parity w/o LOCKING */
36 #define UPDATE_PARITY 4
37
38 /* We need a pre-zeroed page... if we don't want to use the kernel-provided
39 one define it here */
40 #if RAID6_USE_EMPTY_ZERO_PAGE
41 # define raid6_empty_zero_page empty_zero_page
42 #else
43 extern const char raid6_empty_zero_page[PAGE_SIZE];
44 #endif
45
46 #else /* ! __KERNEL__ */
47 /* Used for testing in user space */
48
49 #include <errno.h>
50 #include <inttypes.h>
51 #include <limits.h>
52 #include <stddef.h>
53 #include <sys/mman.h>
54 #include <sys/types.h>
55
56 /* Not standard, but glibc defines it */
57 #define BITS_PER_LONG __WORDSIZE
58
59 typedef uint8_t u8;
60 typedef uint16_t u16;
61 typedef uint32_t u32;
62 typedef uint64_t u64;
63
64 #ifndef PAGE_SIZE
65 # define PAGE_SIZE 4096
66 #endif
67 extern const char raid6_empty_zero_page[PAGE_SIZE];
68
69 #define __init
70 #define __exit
71 #define __attribute_const__ __attribute__((const))
72 #define noinline __attribute__((noinline))
73
74 #define preempt_enable()
75 #define preempt_disable()
76 #define cpu_has_feature(x) 1
77 #define enable_kernel_altivec()
78 #define disable_kernel_altivec()
79
80 #endif /* __KERNEL__ */
81
82 /* Routine choices */
83 struct raid6_calls {
84 void (*gen_syndrome)(int, size_t, void **);
85 int (*valid)(void); /* Returns 1 if this routine set is usable */
86 const char *name; /* Name of this routine set */
87 int prefer; /* Has special performance attribute */
88 };
89
90 /* Selected algorithm */
91 extern struct raid6_calls raid6_call;
92
93 /* Algorithm list */
94 extern const struct raid6_calls * const raid6_algos[];
95 int raid6_select_algo(void);
96
97 /* Return values from chk_syndrome */
98 #define RAID6_OK 0
99 #define RAID6_P_BAD 1
100 #define RAID6_Q_BAD 2
101 #define RAID6_PQ_BAD 3
102
103 /* Galois field tables */
104 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
105 extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
106 extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
107 extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
108
109 /* Recovery routines */
110 void raid6_2data_recov(int disks, size_t bytes, int faila, int failb, void **ptrs);
111 void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs);
112 void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, void **ptrs);
113
114 /* Some definitions to allow code to be compiled for testing in userspace */
115 #ifndef __KERNEL__
116
117 # define jiffies raid6_jiffies()
118 # define printk printf
119 # define GFP_KERNEL 0
120 # define __get_free_pages(x,y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0))
121 # define free_pages(x,y) munmap((void *)(x), (y)*PAGE_SIZE)
122
123 static inline void cpu_relax(void)
124 {
125 /* Nothing */
126 }
127
128 #undef HZ
129 #define HZ 1000
130 static inline uint32_t raid6_jiffies(void)
131 {
132 struct timeval tv;
133 gettimeofday(&tv, NULL);
134 return tv.tv_sec*1000 + tv.tv_usec/1000;
135 }
136
137 #endif /* ! __KERNEL__ */
138
139 #endif /* LINUX_RAID_RAID6_H */
140
This page was automatically generated by the
LXR engine.
Visit the LXR main site for more
information.