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    SubjectRe: Transparent compression in the FS
    > The idea of this sort of block level hashing to allow
    > sharing of identical blocks seems attractive but i wouldn't
    > trust any design that did not accept as given that there
    > would be false positives. This means that a write would
    > have to not only hash the block but then if there is a
    > collision do a compare of the raw data. Then you have to
    > add the overhead of having lists of blocks that match a hash
    > value and reference counts for each block itself. Further,

    Then write every data block will need to dirty at least 2 blocks.
    And it also need to read back the original block if hash exist.
    There must be some performance hit.

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