Nachpt.  You could also put it in the disk driver, a la Stacker.  This would
have the advantage of cleanliness, though you'd only get page-by-page
compression.

But... naah.  I think it would actually do best in the buffer cache.
Whenever you load a chunk of data in, you decompress it; whenever you store

Random access shouldn't be a problem, but from what I know of compression
algorithms writing is.  Most files on a system are only read, anyway, so
this shouldn't be much of a problem.

c