From owner-freebsd-hackers Tue Jul 22 11:04:47 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id LAA15292 for hackers-outgoing; Tue, 22 Jul 1997 11:04:47 -0700 (PDT) Received: from phaeton.artisoft.com (phaeton.Artisoft.COM [198.17.250.50]) by hub.freebsd.org (8.8.5/8.8.5) with SMTP id LAA15284 for ; Tue, 22 Jul 1997 11:04:43 -0700 (PDT) Received: (from terry@localhost) by phaeton.artisoft.com (8.6.11/8.6.9) id LAA13642; Tue, 22 Jul 1997 11:01:01 -0700 From: Terry Lambert Message-Id: <199707221801.LAA13642@phaeton.artisoft.com> Subject: Re: Compressed FS To: terry@lambert.org (Terry Lambert) Date: Tue, 22 Jul 1997 11:01:01 -0700 (MST) Cc: abial@korin.warman.org.pl, freebsd-hackers@FreeBSD.ORG In-Reply-To: <199707220018.RAA12149@phaeton.artisoft.com> from "Terry Lambert" at Jul 21, 97 05:18:27 pm X-Mailer: ELM [version 2.4 PL24] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Rereading this, it could have been confusing... > > 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) ^^^^ John Heidemann > 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 ^^^^ John Dyson > 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.