[Gllug] Loopback mountable image file compression.

[James Courtier-Dutton]

2009/8/26 Phillip Lougher <phillip.lougher at gmail.com>:
>
> 3. Sparse block handling.  Squashfs detects holes (zero filled ranges)
> and handles them specially.  Cloop compresses zero filled blocks,
> leading to worse performance and compression.  Filesystem images often
> have very large ranges of zero filled blocks (unused blocks).

Is there a tool to go through an ext3 partition and fill the unused
space with zero fill?
Can this be done after the ext3 image has been squashfs, thus
resulting in a smaller squashfs image?
I can't rember is squashfs was read/write or read only.

Kind Regards

James
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