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 /* Count errors and error correction from blockcheck.c */
25 struct ocfs2_blockcheck_stats
{
27 u64 b_check_count
; /* Number of blocks we've checked */
28 u64 b_failure_count
; /* Number of failed checksums */
29 u64 b_recover_count
; /* Number of blocks fixed by ecc */
32 * debugfs entries, used if this is passed to
33 * ocfs2_blockcheck_stats_debugfs_install()
35 struct dentry
*b_debug_dir
; /* Parent of the debugfs files */
36 struct dentry
*b_debug_check
; /* Exposes b_check_count */
37 struct dentry
*b_debug_failure
; /* Exposes b_failure_count */
38 struct dentry
*b_debug_recover
; /* Exposes b_recover_count */
42 /* High level block API */
43 void ocfs2_compute_meta_ecc(struct super_block
*sb
, void *data
,
44 struct ocfs2_block_check
*bc
);
45 int ocfs2_validate_meta_ecc(struct super_block
*sb
, void *data
,
46 struct ocfs2_block_check
*bc
);
47 void ocfs2_compute_meta_ecc_bhs(struct super_block
*sb
,
48 struct buffer_head
**bhs
, int nr
,
49 struct ocfs2_block_check
*bc
);
50 int ocfs2_validate_meta_ecc_bhs(struct super_block
*sb
,
51 struct buffer_head
**bhs
, int nr
,
52 struct ocfs2_block_check
*bc
);
55 void ocfs2_block_check_compute(void *data
, size_t blocksize
,
56 struct ocfs2_block_check
*bc
);
57 int ocfs2_block_check_validate(void *data
, size_t blocksize
,
58 struct ocfs2_block_check
*bc
,
59 struct ocfs2_blockcheck_stats
*stats
);
60 void ocfs2_block_check_compute_bhs(struct buffer_head
**bhs
, int nr
,
61 struct ocfs2_block_check
*bc
);
62 int ocfs2_block_check_validate_bhs(struct buffer_head
**bhs
, int nr
,
63 struct ocfs2_block_check
*bc
,
64 struct ocfs2_blockcheck_stats
*stats
);
66 /* Debug Initialization */
67 int ocfs2_blockcheck_stats_debugfs_install(struct ocfs2_blockcheck_stats
*stats
,
68 struct dentry
*parent
);
69 void ocfs2_blockcheck_stats_debugfs_remove(struct ocfs2_blockcheck_stats
*stats
);
72 * Hamming code functions
76 * Encoding hamming code parity bits for a buffer.
78 * This is the low level encoder function. It can be called across
79 * multiple hunks just like the crc32 code. 'd' is the number of bits
80 * _in_this_hunk_. nr is the bit offset of this hunk. So, if you had
81 * two 512B buffers, you would do it like so:
83 * parity = ocfs2_hamming_encode(0, buf1, 512 * 8, 0);
84 * parity = ocfs2_hamming_encode(parity, buf2, 512 * 8, 512 * 8);
86 * If you just have one buffer, use ocfs2_hamming_encode_block().
88 u32
ocfs2_hamming_encode(u32 parity
, void *data
, unsigned int d
,
91 * Fix a buffer with a bit error. The 'fix' is the original parity
92 * xor'd with the parity calculated now.
94 * Like ocfs2_hamming_encode(), this can handle hunks. nr is the bit
95 * offset of the current hunk. If bit to be fixed is not part of the
96 * current hunk, this does nothing.
98 * If you only have one buffer, use ocfs2_hamming_fix_block().
100 void ocfs2_hamming_fix(void *data
, unsigned int d
, unsigned int nr
,
103 /* Convenience wrappers for a single buffer of data */
104 extern u32
ocfs2_hamming_encode_block(void *data
, unsigned int blocksize
);
105 extern void ocfs2_hamming_fix_block(void *data
, unsigned int blocksize
,
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