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From: "Peter T. Breuer" <ptb@it.uc3m.es>
Message-Id: <200209031604.g83G4fY06284@oboe.it.uc3m.es>
Subject: Re: [RFC] mount flag "direct"
In-Reply-To: <Pine.GSO.3.96.1020903174246.20090C-100000@delta.ds2.pg.gda.pl>
 from "Maciej W. Rozycki" at "Sep 3, 2002 05:53:39 pm"
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Date: Tue, 3 Sep 2002 18:04:41 +0200 (MET DST)
Cc: Rik van Riel <riel@conectiva.com.br>, "Peter T. Breuer" <ptb@it.uc3m.es>,
       linux kernel <linux-kernel@vger.kernel.org>
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"A month of sundays ago Maciej W. Rozycki wrote:"
> On Tue, 3 Sep 2002, Rik van Riel wrote:
> > And what if they both allocate the same disk block to another
> > file, simultaneously ?
> 
>  You need a mutex then.  For SCSI devices a reservation is the way to go
> -- the RESERVE/RELEASE commands are mandatory for direct-access devices,
> so thy should work universally for disks.

Is there provision in VFS for this operation?

(i.e. care to point me at an entry point? I just grepped for "reserve"
and came up with nothing useful).

Peter
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