1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * Checksum and ECC codes for the OCFS2 userspace library.
8 * Copyright (C) 2004, 2008 Oracle. All rights reserved.
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License, version 2, as published by the Free Software Foundation.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
20 #ifndef OCFS2_BLOCKCHECK_H
21 #define OCFS2_BLOCKCHECK_H
24 /* High level block API */
25 void ocfs2_compute_meta_ecc(struct super_block
*sb
, void *data
,
26 struct ocfs2_block_check
*bc
);
27 int ocfs2_validate_meta_ecc(struct super_block
*sb
, void *data
,
28 struct ocfs2_block_check
*bc
);
29 void ocfs2_compute_meta_ecc_bhs(struct super_block
*sb
,
30 struct buffer_head
**bhs
, int nr
,
31 struct ocfs2_block_check
*bc
);
32 int ocfs2_validate_meta_ecc_bhs(struct super_block
*sb
,
33 struct buffer_head
**bhs
, int nr
,
34 struct ocfs2_block_check
*bc
);
37 void ocfs2_block_check_compute(void *data
, size_t blocksize
,
38 struct ocfs2_block_check
*bc
);
39 int ocfs2_block_check_validate(void *data
, size_t blocksize
,
40 struct ocfs2_block_check
*bc
);
41 void ocfs2_block_check_compute_bhs(struct buffer_head
**bhs
, int nr
,
42 struct ocfs2_block_check
*bc
);
43 int ocfs2_block_check_validate_bhs(struct buffer_head
**bhs
, int nr
,
44 struct ocfs2_block_check
*bc
);
47 * Hamming code functions
51 * Encoding hamming code parity bits for a buffer.
53 * This is the low level encoder function. It can be called across
54 * multiple hunks just like the crc32 code. 'd' is the number of bits
55 * _in_this_hunk_. nr is the bit offset of this hunk. So, if you had
56 * two 512B buffers, you would do it like so:
58 * parity = ocfs2_hamming_encode(0, buf1, 512 * 8, 0);
59 * parity = ocfs2_hamming_encode(parity, buf2, 512 * 8, 512 * 8);
61 * If you just have one buffer, use ocfs2_hamming_encode_block().
63 u32
ocfs2_hamming_encode(u32 parity
, void *data
, unsigned int d
,
66 * Fix a buffer with a bit error. The 'fix' is the original parity
67 * xor'd with the parity calculated now.
69 * Like ocfs2_hamming_encode(), this can handle hunks. nr is the bit
70 * offset of the current hunk. If bit to be fixed is not part of the
71 * current hunk, this does nothing.
73 * If you only have one buffer, use ocfs2_hamming_fix_block().
75 void ocfs2_hamming_fix(void *data
, unsigned int d
, unsigned int nr
,
78 /* Convenience wrappers for a single buffer of data */
79 extern u32
ocfs2_hamming_encode_block(void *data
, unsigned int blocksize
);
80 extern void ocfs2_hamming_fix_block(void *data
, unsigned int blocksize
,
This page took 0.033209 seconds and 6 git commands to generate.