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btrfs: factor out a btrfs_csum_ptr helper
Add a helper to find the csum for a byte offset into the csum buffer. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David Sterba <dsterba@suse.com>
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@ -2733,6 +2733,14 @@ int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
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enum btrfs_inline_ref_type is_data);
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u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
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static inline u8 *btrfs_csum_ptr(const struct btrfs_fs_info *fs_info, u8 *csums,
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u64 offset)
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{
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u64 offset_in_sectors = offset >> fs_info->sectorsize_bits;
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return csums + offset_in_sectors * fs_info->csum_size;
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}
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/*
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* Take the number of bytes to be checksummed and figure out how many leaves
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* it would require to store the csums for that many bytes.
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@ -3371,15 +3371,12 @@ static int check_data_csum(struct inode *inode, struct btrfs_bio *bbio,
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{
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struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
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u32 len = fs_info->sectorsize;
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const u32 csum_size = fs_info->csum_size;
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unsigned int offset_sectors;
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u8 *csum_expected;
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u8 csum[BTRFS_CSUM_SIZE];
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ASSERT(pgoff + len <= PAGE_SIZE);
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offset_sectors = bio_offset >> fs_info->sectorsize_bits;
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csum_expected = ((u8 *)bbio->csum) + offset_sectors * csum_size;
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csum_expected = btrfs_csum_ptr(fs_info, bbio->csum, bio_offset);
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if (btrfs_check_sector_csum(fs_info, page, pgoff, csum, csum_expected))
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goto zeroit;
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@ -8020,12 +8017,8 @@ static inline blk_status_t btrfs_submit_dio_bio(struct bio *bio,
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if (ret)
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goto err;
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} else {
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u64 csum_offset;
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csum_offset = file_offset - dip->file_offset;
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csum_offset >>= fs_info->sectorsize_bits;
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csum_offset *= fs_info->csum_size;
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btrfs_bio(bio)->csum = dip->csums + csum_offset;
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btrfs_bio(bio)->csum = btrfs_csum_ptr(fs_info, dip->csums,
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file_offset - dip->file_offset);
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}
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map:
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ret = btrfs_map_bio(fs_info, bio, 0);
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