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96 lines
3.3 KiB
96 lines
3.3 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* -*- mode: c; c-basic-offset: 8; -*- |
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* vim: noexpandtab sw=8 ts=8 sts=0: |
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* |
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* blockcheck.h |
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* |
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* Checksum and ECC codes for the OCFS2 userspace library. |
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* |
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* Copyright (C) 2004, 2008 Oracle. All rights reserved. |
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*/ |
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#ifndef OCFS2_BLOCKCHECK_H |
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#define OCFS2_BLOCKCHECK_H |
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/* Count errors and error correction from blockcheck.c */ |
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struct ocfs2_blockcheck_stats { |
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spinlock_t b_lock; |
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u64 b_check_count; /* Number of blocks we've checked */ |
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u64 b_failure_count; /* Number of failed checksums */ |
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u64 b_recover_count; /* Number of blocks fixed by ecc */ |
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/* |
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* debugfs entries, used if this is passed to |
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* ocfs2_blockcheck_stats_debugfs_install() |
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*/ |
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struct dentry *b_debug_dir; /* Parent of the debugfs files */ |
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}; |
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/* High level block API */ |
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void ocfs2_compute_meta_ecc(struct super_block *sb, void *data, |
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struct ocfs2_block_check *bc); |
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int ocfs2_validate_meta_ecc(struct super_block *sb, void *data, |
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struct ocfs2_block_check *bc); |
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void ocfs2_compute_meta_ecc_bhs(struct super_block *sb, |
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struct buffer_head **bhs, int nr, |
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struct ocfs2_block_check *bc); |
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int ocfs2_validate_meta_ecc_bhs(struct super_block *sb, |
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struct buffer_head **bhs, int nr, |
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struct ocfs2_block_check *bc); |
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/* Lower level API */ |
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void ocfs2_block_check_compute(void *data, size_t blocksize, |
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struct ocfs2_block_check *bc); |
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int ocfs2_block_check_validate(void *data, size_t blocksize, |
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struct ocfs2_block_check *bc, |
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struct ocfs2_blockcheck_stats *stats); |
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void ocfs2_block_check_compute_bhs(struct buffer_head **bhs, int nr, |
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struct ocfs2_block_check *bc); |
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int ocfs2_block_check_validate_bhs(struct buffer_head **bhs, int nr, |
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struct ocfs2_block_check *bc, |
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struct ocfs2_blockcheck_stats *stats); |
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/* Debug Initialization */ |
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void ocfs2_blockcheck_stats_debugfs_install(struct ocfs2_blockcheck_stats *stats, |
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struct dentry *parent); |
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void ocfs2_blockcheck_stats_debugfs_remove(struct ocfs2_blockcheck_stats *stats); |
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/* |
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* Hamming code functions |
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*/ |
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/* |
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* Encoding hamming code parity bits for a buffer. |
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* |
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* This is the low level encoder function. It can be called across |
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* multiple hunks just like the crc32 code. 'd' is the number of bits |
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* _in_this_hunk_. nr is the bit offset of this hunk. So, if you had |
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* two 512B buffers, you would do it like so: |
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* |
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* parity = ocfs2_hamming_encode(0, buf1, 512 * 8, 0); |
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* parity = ocfs2_hamming_encode(parity, buf2, 512 * 8, 512 * 8); |
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* |
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* If you just have one buffer, use ocfs2_hamming_encode_block(). |
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*/ |
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u32 ocfs2_hamming_encode(u32 parity, void *data, unsigned int d, |
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unsigned int nr); |
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/* |
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* Fix a buffer with a bit error. The 'fix' is the original parity |
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* xor'd with the parity calculated now. |
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* |
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* Like ocfs2_hamming_encode(), this can handle hunks. nr is the bit |
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* offset of the current hunk. If bit to be fixed is not part of the |
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* current hunk, this does nothing. |
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* |
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* If you only have one buffer, use ocfs2_hamming_fix_block(). |
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*/ |
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void ocfs2_hamming_fix(void *data, unsigned int d, unsigned int nr, |
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unsigned int fix); |
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/* Convenience wrappers for a single buffer of data */ |
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extern u32 ocfs2_hamming_encode_block(void *data, unsigned int blocksize); |
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extern void ocfs2_hamming_fix_block(void *data, unsigned int blocksize, |
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unsigned int fix); |
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#endif
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