Date: Mon, 21 Jul 1997 17:18:27 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: abial@korin.warman.org.pl (Andrzej Bialecki) Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Compressed FS Message-ID: <199707220018.RAA12149@phaeton.artisoft.com> In-Reply-To: <Pine.NEB.3.95.970721120306.7588A-100000@korin.warman.org.pl> from "Andrzej Bialecki" at Jul 21, 97 12:07:23 pm
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> I'm reading the Heidemann's thesis right now (on stackable FS design). He > mentions that among others they implemented a compression layer. Did > anyone do something similar under FreeBSD? It would be cool to have it, > IMHO. John has sent the compression code (and some cryptographic code) layers to severa people, including myself, with the request that we not redistribute the code without prior permission. The BSD layering is such that the VM issues are, in some cases, hard to overcome (which is why union FS's currently don't work in the main line tree). Any compression (or cryptographic) FS would face similar problems, since it would need to maintain seperate cache data for the uncompressed (or deencrypted) file blocks. Actually, you should check with John: he was working on the union FS code to make it work with the new VM. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
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