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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * blockcheck.h
- *
- * Checksum and ECC codes for the OCFS2 userspace library.
- *
- * Copyright (C) 2004, 2008 Oracle. All rights reserved.
- */
- #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 */
- };
- /* 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 */
- void 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
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