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The refactoring involves the following parts:
- Introduce bytes_to_csum_size() and csum_size_to_bytes() helpers
As we have quite some open-coded calculations, some of them are even
split into two assignments just to fit 80 chars limit.
- Remove the @csum_size parameter from max_ordered_sum_bytes()
Csum size can be fetched from @fs_info.
And we will use the csum_size_to_bytes() helper anyway.
- Add a comment explaining how we handle the first search result
- Use newly introduced helpers to cleanup btrfs_lookup_csums_range()
- Move variables declaration to the minimal scope
- Never mix number of sectors with bytes
There are several locations doing things like:
size = min_t(size_t, csum_end - start,
max_ordered_sum_bytes(fs_info));
...
size >>= fs_info->sectorsize_bits
Or
offset = (start - key.offset) >> fs_info->sectorsize_bits;
offset *= csum_size;
Make sure these variables can only represent BYTES inside the
function, by using the above bytes_to_csum_size() helpers.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
cb649e81da