Subject: Re: VFS mediator?
To: trond.myklebust@fys.uio.no (Trond Myklebust)
Date: Tue, 19 Mar 2002 00:15:49 +0000 (GMT)
Cc: pavel@suse.cz (Pavel Machek), viro@math.psu.edu (Alexander Viro),
        alan@lxorguk.ukuu.org.uk (Alan Cox),
        Simon.Richter@phobos.fachschaften.tu-muenchen.de (Simon Richter),
        jbarker@ebi.ac.uk (Jonathan Barker), linux-kernel@vger.kernel.org
In-Reply-To: <shs1yeha5b4.fsf@charged.uio.no> from "Trond Myklebust" at Mar 18, 2002 11:18:07 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Sender: linux-kernel-owner@vger.kernel.org

>      > Does not work... If you mount nfs server on localhost, you can
>      > deadlock.
> 
> Huh? Examples please? A hell of a lot of work has gone into ensuring
> that this cannot happen. I do most of my NFS client work on this sort
> of setup, so it had bloody well better work...

At least theoretically it can. Imagine you have every other process stuck
trying to page out (or blocked on a page out) over NFS, including your
user mode nfs process. In practice it would be very hard to arrange but
the theory is real.

Alan
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