linux-kernel - Re: Versioning file system

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Date:	Tue, 19 Jun 2007 00:26:57 +0200
From:	Jörn Engel <joern@...fs.org>
To:	Theodore Tso <tytso@....edu>, "H. Peter Anvin" <hpa@...or.com>,
	alan <alan@...eserver.org>, Bodo Eggert <7eggert@....de>,
	Jörn Engel <joern@...fs.org>,
	Jack Stone <jack@...keye.stone.uk.eu.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	akpm@...ux-foundation.org, viro@...iv.linux.org.uk
Subject: Re: Versioning file system

On Mon, 18 June 2007 18:10:21 -0400, Theodore Tso wrote:
> On Mon, Jun 18, 2007 at 02:31:14PM -0700, H. Peter Anvin wrote:
> > And that makes them different from extended attributes, how?
> > 
> > Both of these really are nothing but ad hocky syntactic sugar for
> > directories, sometimes combined with in-filesystem support for small
> > data items.
> 
> There's a good discussion of the issues involved in my LCA 2006
> presentation....  which doesn't seem to be on the LCA 2006 site.  Hrm.
> I'll have to ask that this be fixed.  In any case, here it is:
> 
> 	http://thunk.org/tytso/forkdepot.odp

The main difference appears to be the potential size.  Both extended
attributes and forks allow for extra data that I neither want or need.
But once the extra space is large enough to hide a rootkit in, it
becomes a security problem instead of just something pointless.

Pointless here means that _I_ don't see the point.  Maybe there are
valid uses for extended attributes.  If there are, noone has explained
them to me yet.

Jörn

-- 
They laughed at Galileo.  They laughed at Copernicus.  They laughed at
Columbus. But remember, they also laughed at Bozo the Clown.
-- unknown
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