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Message-ID: <1279761478.4397.8.camel@localhost.localdomain>
Date:	Thu, 22 Jul 2010 03:17:58 +0200
From:	Lubomir Rintel <lkundrak@...sk>
To:	Christoph Hellwig <hch@....de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 3/3] [fs/sysv] V7: Add support for non-PDP11 v7
 filesystems

On Tue, 2010-07-20 at 12:41 +0200, Lubomir Rintel wrote:
> On Mon, 2010-07-19 at 16:58 +0200, Christoph Hellwig wrote:
... 
> > Do you actually need the mount option?  We get away just fine with
> > it for sysv filesystems.  And if not I'd be consistent and accept the
> > options for both sysv and v7 filesystems.
...
> Coherent seems to always use PDP-11 bytesex. I can not check at the
> time, but I'm almost sure it never run on such machines (was PC and 68k
> only?), so I suspect the coherent kernel might have always done the
> translation to native byte order. I think I have some coherent (for PC)
> floppies at home, so I can check tomorrow.

This was just partly correct. Coherent indeed run on PDP-11 (and not on
68k), but the PC version uses the very same bytesex as PDP-11 one,
translating the byte order on the fly (_canl() routine defined in
i386/as.inc file of Coherent 4.2.10 for i386 kernel is used).

Thus the mount option is really only useful with v7 filesystem and none
of those handled with sysv filesystem.

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