diff options
author | Dan Williams <dan.j.williams@intel.com> | 2009-03-31 00:09:39 -0400 |
---|---|---|
committer | NeilBrown <neilb@suse.de> | 2009-03-31 00:09:39 -0400 |
commit | f701d589aa34d7531183c9ac6f7713ba14212b02 (patch) | |
tree | d388cd7fa54c520f12233470a35ebb0676677e7a /include/linux/raid/pq.h | |
parent | 18b0033491f584a2d79697da714b1ef9d6b27d22 (diff) |
md/raid6: move raid6 data processing to raid6_pq.ko
Move the raid6 data processing routines into a standalone module
(raid6_pq) to prepare them to be called from async_tx wrappers and other
non-md drivers/modules. This precludes a circular dependency of raid456
needing the async modules for data processing while those modules in
turn depend on raid456 for the base level synchronous raid6 routines.
To support this move:
1/ The exportable definitions in raid6.h move to include/linux/raid/pq.h
2/ The raid6_call, recovery calls, and table symbols are exported
3/ Extra #ifdef __KERNEL__ statements to enable the userspace raid6test to
compile
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'include/linux/raid/pq.h')
-rw-r--r-- | include/linux/raid/pq.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/include/linux/raid/pq.h b/include/linux/raid/pq.h new file mode 100644 index 000000000000..d92480f8285c --- /dev/null +++ b/include/linux/raid/pq.h | |||
@@ -0,0 +1,132 @@ | |||
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 | * Boston 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 | #include <linux/blkdev.h> | ||
21 | |||
22 | /* We need a pre-zeroed page... if we don't want to use the kernel-provided | ||
23 | one define it here */ | ||
24 | #if RAID6_USE_EMPTY_ZERO_PAGE | ||
25 | # define raid6_empty_zero_page empty_zero_page | ||
26 | #else | ||
27 | extern const char raid6_empty_zero_page[PAGE_SIZE]; | ||
28 | #endif | ||
29 | |||
30 | #else /* ! __KERNEL__ */ | ||
31 | /* Used for testing in user space */ | ||
32 | |||
33 | #include <errno.h> | ||
34 | #include <inttypes.h> | ||
35 | #include <limits.h> | ||
36 | #include <stddef.h> | ||
37 | #include <sys/mman.h> | ||
38 | #include <sys/types.h> | ||
39 | |||
40 | /* Not standard, but glibc defines it */ | ||
41 | #define BITS_PER_LONG __WORDSIZE | ||
42 | |||
43 | typedef uint8_t u8; | ||
44 | typedef uint16_t u16; | ||
45 | typedef uint32_t u32; | ||
46 | typedef uint64_t u64; | ||
47 | |||
48 | #ifndef PAGE_SIZE | ||
49 | # define PAGE_SIZE 4096 | ||
50 | #endif | ||
51 | extern const char raid6_empty_zero_page[PAGE_SIZE]; | ||
52 | |||
53 | #define __init | ||
54 | #define __exit | ||
55 | #define __attribute_const__ __attribute__((const)) | ||
56 | #define noinline __attribute__((noinline)) | ||
57 | |||
58 | #define preempt_enable() | ||
59 | #define preempt_disable() | ||
60 | #define cpu_has_feature(x) 1 | ||
61 | #define enable_kernel_altivec() | ||
62 | #define disable_kernel_altivec() | ||
63 | |||
64 | #define EXPORT_SYMBOL(sym) | ||
65 | #define MODULE_LICENSE(licence) | ||
66 | #define subsys_initcall(x) | ||
67 | #define module_exit(x) | ||
68 | #endif /* __KERNEL__ */ | ||
69 | |||
70 | /* Routine choices */ | ||
71 | struct raid6_calls { | ||
72 | void (*gen_syndrome)(int, size_t, void **); | ||
73 | int (*valid)(void); /* Returns 1 if this routine set is usable */ | ||
74 | const char *name; /* Name of this routine set */ | ||
75 | int prefer; /* Has special performance attribute */ | ||
76 | }; | ||
77 | |||
78 | /* Selected algorithm */ | ||
79 | extern struct raid6_calls raid6_call; | ||
80 | |||
81 | /* Algorithm list */ | ||
82 | extern const struct raid6_calls * const raid6_algos[]; | ||
83 | int raid6_select_algo(void); | ||
84 | |||
85 | /* Return values from chk_syndrome */ | ||
86 | #define RAID6_OK 0 | ||
87 | #define RAID6_P_BAD 1 | ||
88 | #define RAID6_Q_BAD 2 | ||
89 | #define RAID6_PQ_BAD 3 | ||
90 | |||
91 | /* Galois field tables */ | ||
92 | extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); | ||
93 | extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); | ||
94 | extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); | ||
95 | extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); | ||
96 | |||
97 | /* Recovery routines */ | ||
98 | void raid6_2data_recov(int disks, size_t bytes, int faila, int failb, | ||
99 | void **ptrs); | ||
100 | void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs); | ||
101 | void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, | ||
102 | void **ptrs); | ||
103 | |||
104 | /* Some definitions to allow code to be compiled for testing in userspace */ | ||
105 | #ifndef __KERNEL__ | ||
106 | |||
107 | # define jiffies raid6_jiffies() | ||
108 | # define printk printf | ||
109 | # define GFP_KERNEL 0 | ||
110 | # define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \ | ||
111 | PROT_READ|PROT_WRITE, \ | ||
112 | MAP_PRIVATE|MAP_ANONYMOUS,\ | ||
113 | 0, 0)) | ||
114 | # define free_pages(x, y) munmap((void *)(x), (y)*PAGE_SIZE) | ||
115 | |||
116 | static inline void cpu_relax(void) | ||
117 | { | ||
118 | /* Nothing */ | ||
119 | } | ||
120 | |||
121 | #undef HZ | ||
122 | #define HZ 1000 | ||
123 | static inline uint32_t raid6_jiffies(void) | ||
124 | { | ||
125 | struct timeval tv; | ||
126 | gettimeofday(&tv, NULL); | ||
127 | return tv.tv_sec*1000 + tv.tv_usec/1000; | ||
128 | } | ||
129 | |||
130 | #endif /* ! __KERNEL__ */ | ||
131 | |||
132 | #endif /* LINUX_RAID_RAID6_H */ | ||