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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | /* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * blockcheck.h * * Checksum and ECC codes for the OCFS2 userspace library. * * Copyright (C) 2004, 2008 Oracle. 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, version 2, as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ #ifndef OCFS2_BLOCKCHECK_H #define OCFS2_BLOCKCHECK_H /* Count errors and error correction from blockcheck.c */ struct ocfs2_blockcheck_stats { spinlock_t b_lock; u64 b_check_count; /* Number of blocks we've checked */ u64 b_failure_count; /* Number of failed checksums */ u64 b_recover_count; /* Number of blocks fixed by ecc */ /* * debugfs entries, used if this is passed to * ocfs2_blockcheck_stats_debugfs_install() */ struct dentry *b_debug_dir; /* Parent of the debugfs files */ struct dentry *b_debug_check; /* Exposes b_check_count */ struct dentry *b_debug_failure; /* Exposes b_failure_count */ struct dentry *b_debug_recover; /* Exposes b_recover_count */ }; /* High level block API */ void ocfs2_compute_meta_ecc(struct super_block *sb, void *data, struct ocfs2_block_check *bc); int ocfs2_validate_meta_ecc(struct super_block *sb, void *data, struct ocfs2_block_check *bc); void ocfs2_compute_meta_ecc_bhs(struct super_block *sb, struct buffer_head **bhs, int nr, struct ocfs2_block_check *bc); int ocfs2_validate_meta_ecc_bhs(struct super_block *sb, struct buffer_head **bhs, int nr, struct ocfs2_block_check *bc); /* Lower level API */ void ocfs2_block_check_compute(void *data, size_t blocksize, struct ocfs2_block_check *bc); int ocfs2_block_check_validate(void *data, size_t blocksize, struct ocfs2_block_check *bc, struct ocfs2_blockcheck_stats *stats); void ocfs2_block_check_compute_bhs(struct buffer_head **bhs, int nr, struct ocfs2_block_check *bc); int ocfs2_block_check_validate_bhs(struct buffer_head **bhs, int nr, struct ocfs2_block_check *bc, struct ocfs2_blockcheck_stats *stats); /* Debug Initialization */ int ocfs2_blockcheck_stats_debugfs_install(struct ocfs2_blockcheck_stats *stats, struct dentry *parent); void ocfs2_blockcheck_stats_debugfs_remove(struct ocfs2_blockcheck_stats *stats); /* * Hamming code functions */ /* * Encoding hamming code parity bits for a buffer. * * This is the low level encoder function. It can be called across * multiple hunks just like the crc32 code. 'd' is the number of bits * _in_this_hunk_. nr is the bit offset of this hunk. So, if you had * two 512B buffers, you would do it like so: * * parity = ocfs2_hamming_encode(0, buf1, 512 * 8, 0); * parity = ocfs2_hamming_encode(parity, buf2, 512 * 8, 512 * 8); * * If you just have one buffer, use ocfs2_hamming_encode_block(). */ u32 ocfs2_hamming_encode(u32 parity, void *data, unsigned int d, unsigned int nr); /* * Fix a buffer with a bit error. The 'fix' is the original parity * xor'd with the parity calculated now. * * Like ocfs2_hamming_encode(), this can handle hunks. nr is the bit * offset of the current hunk. If bit to be fixed is not part of the * current hunk, this does nothing. * * If you only have one buffer, use ocfs2_hamming_fix_block(). */ void ocfs2_hamming_fix(void *data, unsigned int d, unsigned int nr, unsigned int fix); /* Convenience wrappers for a single buffer of data */ extern u32 ocfs2_hamming_encode_block(void *data, unsigned int blocksize); extern void ocfs2_hamming_fix_block(void *data, unsigned int blocksize, unsigned int fix); #endif |