Date: Fri, 20 Jun 2003 07:32:37 -0700 From: Michael Sierchio <kudzu@tenebras.com> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: fs@freebsd.org Subject: Re: ideas about a unioning file system Message-ID: <3EF31B05.5070004@tenebras.com> In-Reply-To: <7880.1056099348@critter.freebsd.dk> References: <7880.1056099348@critter.freebsd.dk>
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Poul-Henning Kamp wrote: > The majority of the problems we have in this area can be nailed down > to only two issues: > 1. The very tricky semantics of rename(2) > 2. read/write/mmap coherency for stacked filesystems. This is of particular interest to me. While Poul-Henning has done some very interesting work on encryption at the GEOM level, I'm trying to work with ACL filesystems and stacking crypto filesystems that manage keys with one per file. Imagine the coherency problems when pages don't match up because of IVs for CBC block mode encryption, and imagine the headache for (un-)locking pages at different levels. Making it easy for FIST and cryptfs (Erez Zadok's stuff) would be very helpful. (I.e. gee, I'd rather not have to do this on Linux).
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