Date: Mon, 26 Jan 2004 19:42:54 -0600
From: Andy Isaacson <adi@hexapodia.org>
To: Adam Sampson <azz@us-lot.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Encrypted Filesystem
Message-ID: <20040127014254.GA1379@hexapodia.org>
References: <OFA97B290B.67DE842E-ON87256E27.0061728C-86256E27.0061BB0E@us.ibm.com> <y2ar7xmkyqe.fsf@cartman.at.fivegeeks.net>
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On Tue, Jan 27, 2004 at 12:43:21AM +0000, Adam Sampson wrote:
> Michael A Halcrow <mahalcro@us.ibm.com> writes:
> >  - Userland filesystem-based (EncFS+FUSE, CryptoFS+LUFS)
> 
> Going off on a tangent...
> 
> There are all sorts of potentially-interesting things that could be
> done if Linux had a userspace filesystem mechanism included in the
> standard kernel -- as well as encryption, there's also network
> filesystems, various sorts of specialised caching (such as Zero
> Install), automounter-like systems, prototyping and so on.
> 
> Is there a technical reason that none of the userspace filesystem
> layers have been included in the stock kernel, or is it just that
> nobody's submitted any of them for inclusion yet?

There are a lot of subtle and not-so-subtle problems in this space.
For example, I really liked the paging example given in section 3.1 of
[Mazi2001].

[Mazi2001] "A toolkit for user-level file systems", David Mazieres,
    Proceedings of the 2001 USENIX Technical Conference
    available at http://www.fs.net/sfswww/pubs.html

-andy
-
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