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Date: Tue, 3 Sep 2002 13:08:14 -0300 (BRT)
From: Rik van Riel <riel@conectiva.com.br>
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To: "Peter T. Breuer" <ptb@it.uc3m.es>
Cc: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>,
       linux kernel <linux-kernel@vger.kernel.org>
Subject: Re: [RFC] mount flag "direct"
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On Tue, 3 Sep 2002, Peter T. Breuer wrote:
> "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?

No. Everybody but you seems to agree these things should be
filesystem specific and not in the VFS.

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

Good.

cheers,

Rik
-- 
	http://www.linuxsymposium.org/2002/
"You're one of those condescending OLS attendants"
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