Compacting CNFS buffers

Has anyone investigated the feasibility of compacting or compressing
the cnfs buffer files?

Here's a couple of scenarios to consider, keeping in mind that
generally, articles are not expired.

1. You are sent a bunch of articles but discover you've left some
binary newsgroups in your active file. You put this groups in your
expire list and delete rmgroup but you're left with a lot of empty
space, never to be used again unless the buffer recycles.

2. You receive a bunch of googlegroup spam articles that are deleted
via NOCEM, however considering there are so many, that leaves a lot of
unused space.


If you can find where an expired article is on disk and then find the
next article, you can just move it on disk and update the pointers to
the file. This could be a process that you just kick off or,
preferably, something that runs when innd isn't fully occupied using
spare cycles or something.


I know disk space is cheap these days but some people may be limited.
It would be good not to waste space.

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