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Uncompressed clusters

In some cases, a cluster does not compress well. For instance, a cluster with only one block of data will not compress into less than one block. (At the time of writing, `fragments' are not supported in the ext2 filesystem, so the minimum allocation grain size is a block.) Sometimes compressed data occupies more bytes than if uncompressed. In such cases we just leave the cluster as it was. For instance if cluster #1 does not compress well, the compressed file would look like this:

    block#          bytes
    ------          -----

     [0]        compressed data   <- cluster #0
     [1]        missing block
     [2]        missing block
     [3]        missing block

     [4]        data              <- cluster #1
     [5]        data                  (does not compress well)
     [6]        data
     [7]        data

     [8]        compressed data   <- cluster #2
     [9]        compressed data
     [10]       missing block

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