Date: Wed, 18 Aug 1999 06:05:08 +0900 (JST) From: Michael Hancock <michaelh@cet.co.jp> To: Bill Studenmund <wrstuden@nas.nasa.gov> Cc: Terry Lambert <tlambert@primenet.com>, Hackers@FreeBSD.ORG, fs@FreeBSD.ORG Subject: Re: BSD XFS Port & BSD VFS Rewrite Message-ID: <Pine.BSF.3.95LJ1.1b3.990818055720.18717A-100000@sv01.cet.co.jp> In-Reply-To: <Pine.SOL.3.96.990817092121.6014C-100000@marcy.nas.nasa.gov>
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> > Have you tried Heidemann's student's stacking layers? There is one > > encryption, and one per-file compression with namespace hiding, that > > I think it would be hard pressed to keep up with. But I'll give it > > the benefit of the doubt. 8-). > > Nope. The problem is that while stacking (null, umap, and overlay fs's) > work, we don't have the coherency issues worked out so that upper layers > can cache data. i.e. so that the lower fs knows it has to ask the uper > layers to give pages back. :-) But multiple ls -lR's work fine. :-) Interesting, have you read the Heidemann paper that outlines a solution that uses a cache manager? You can probably find it somewhere here, http://www.isi.edu/~johnh/SOFTWARE/UCLA_STACKING/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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