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From: Daniel Phillips <phillips@arcor.de>
To: ptb@it.uc3m.es, Anton Altaparmakov <aia21@cantab.net>
Subject: Re: [RFC] mount flag "direct"
Date: Tue, 3 Sep 2002 20:20:20 +0200
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Cc: "Peter T. Breuer" <ptb@it.uc3m.es>,
       linux kernel <linux-kernel@vger.kernel.org>
References: <200209031544.g83FiAG03134@oboe.it.uc3m.es>
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On Tuesday 03 September 2002 17:44, Peter T. Breuer wrote:
> > > Scenario:
> > > I have a driver which accesses a "disk" at the block level, to which
> > > another driver on another machine is also writing. I want to have
> > > an arbitrary FS on this device which can be read from and written to
> > > from both kernels, and I want support at the block level for this idea.
> > 
> > You cannot have an arbitrary fs. The two fs drivers must coordinate with
> > each other in order for your scheme to work. Just think about if the two 
> > fs drivers work on the same file simultaneously and both start growing the
> > file at the same time. All hell would break lose.
> 
> Thanks!
> 
> Rik also mentioned that objection! That's good. You both "only" see
> the same problem, so there can't be many more like it..

(intentionally misinterpreting)  No indeed, there are aren't many problems
like it, in terms of sheer complexity.

-- 
Daniel
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