linux-kernel - Re: [RFC] VFS: FS CoW using redirection

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Message-ID: <20060823172402.GC15851@wohnheim.fh-wedel.de>
Date:	Wed, 23 Aug 2006 19:24:02 +0200
From:	Jörn Engel <joern@...nheim.fh-wedel.de>
To:	Al Boldi <a1426z@...ab.com>
Cc:	Eric Van Hensbergen <ericvh@...il.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] VFS: FS CoW using redirection

On Sun, 9 July 2006 15:50:36 +0300, Al Boldi wrote:
> 
> Consider something simple like this:
> 
> VFS - anyFS1 (r/w) used normally, unless ENotFound, then redirect read to
>     \              anyFS2, or CoW from anyFS2 to anyFS1.
>       anyFS2 (r/o) used normally.

That concept is known as union mount.  Jan Blunck did some patches in
that direction, you might be able to find them in the archives.  If
not, just send him a mail.

Jörn

-- 
...one more straw can't possibly matter...
-- Kirby Bakken
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