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Date: Thu, 10 Jul 2003 21:00:30 +0200
From: Jan Kara <jack@suse.cz>
To: Christoph Hellwig <hch@infradead.org>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Marcelo Tosatti <marcelo@conectiva.com.br>,
       Jeff Garzik <jgarzik@pobox.com>, LKML <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@digeo.com>
Subject: Re: RFC:  what's in a stable series?
Message-ID: <20030710190030.GC8678@atrey.karlin.mff.cuni.cz>
References: <3F0CBC08.1060201@pobox.com> <Pine.LNX.4.55L.0307100040271.6629@freak.distro.conectiva> <20030710085338.C28672@infradead.org> <1057835998.8028.6.camel@dhcp22.swansea.linux.org.uk> <Pine.LNX.4.55L.0307100910550.7857@freak.distro.conectiva> <1057840919.8027.19.camel@dhcp22.swansea.linux.org.uk> <20030710161553.C22512@infradead.org>
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> On Thu, Jul 10, 2003 at 01:42:00PM +0100, Alan Cox wrote:
> > On Iau, 2003-07-10 at 13:13, Marcelo Tosatti wrote:
> > > So Christoph's quota patch does not support vendors "v1" files?
> > > 
> > > I must be misunderstanding someone.
> > 
> > There are three species of quota in Linux
> > 
> > v0	(official old Linux)
> > v1	(most 2.4 vendor trees)
> > v2	(the 2.5 format)
> 
> Umm, no.  You misunderstood.
> 
> There's two quota _ondisk_ formats:
> 
> v1 old 16bit quota.
> v2 new 32bit quota.
> 
> 2.4 previously only supported v1, 2.5 and 2.4.22-pre4 also support v2.
  Exactly.

> There's three sys_quotactl ABIs
> 
> 1) original 16 bit one, supported by all kernels <= 2.4
> 2) first 32bit one, supported by 2.4-ac any many vendor trees, but never
>    in mainline
  Actually at least later SuSE kernels and -ac kernels support 3)...

> 3) new 32bit one, supported by 2.4.x (x >= 22-pre4) and 2.5
  Right.

> Unfortunately the second one uses the same constants as the old 16bit one
> but different structures so there is no way to support both in a single
> kernel.

								Honza

-- 
Jan Kara <jack@suse.cz>
SuSE CR Labs