Btrfs: heuristic: add byte set calculation
Calculate byte set size for data sample: - calculate how many unique bytes have been in the sample - for all bytes count > 0, check if we're still in the low count range (~25%), such data are easily compressible, otherwise furhter analysis is needed Signed-off-by:Timofey Titovets <nefelim4ag@gmail.com> Reviewed-by:
David Sterba <dsterba@suse.com> [ update comments ] Signed-off-by:
David Sterba <dsterba@suse.com>
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1fe4f6fa
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