From owner-freebsd-geom@FreeBSD.ORG  Sun Mar  8 20:51:25 2009
Return-Path: <owner-freebsd-geom@FreeBSD.ORG>
Delivered-To: freebsd-geom@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id C9F19106564A
	for <freebsd-geom@freebsd.org>; Sun,  8 Mar 2009 20:51:25 +0000 (UTC)
	(envelope-from luigi@onelab2.iet.unipi.it)
Received: from onelab2.iet.unipi.it (onelab2.iet.unipi.it [131.114.9.129])
	by mx1.freebsd.org (Postfix) with ESMTP id 8F6E58FC08
	for <freebsd-geom@freebsd.org>; Sun,  8 Mar 2009 20:51:25 +0000 (UTC)
	(envelope-from luigi@onelab2.iet.unipi.it)
Received: by onelab2.iet.unipi.it (Postfix, from userid 275)
	id 05ABA7309E; Sun,  8 Mar 2009 21:38:12 +0100 (CET)
Date: Sun, 8 Mar 2009 21:38:12 +0100
From: Luigi Rizzo <rizzo@iet.unipi.it>
To: Ivan Voras <ivoras@freebsd.org>
Message-ID: <20090308203811.GA4042@onelab2.iet.unipi.it>
References: <20090308005515.GA68934@onelab2.iet.unipi.it>
	<gp13bt$o06$1@ger.gmane.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <gp13bt$o06$1@ger.gmane.org>
User-Agent: Mutt/1.4.2.3i
Cc: freebsd-stable@freebsd.org, freebsd-geom@freebsd.org
Subject: Re: updated geom_sched code
X-BeenThere: freebsd-geom@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: GEOM-specific discussions and implementations
	<freebsd-geom.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-geom>,
	<mailto:freebsd-geom-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-geom>
List-Post: <mailto:freebsd-geom@freebsd.org>
List-Help: <mailto:freebsd-geom-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-geom>,
	<mailto:freebsd-geom-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 08 Mar 2009 20:51:26 -0000

On Sun, Mar 08, 2009 at 07:38:30PM +0100, Ivan Voras wrote:
> Luigi Rizzo wrote:
...
> > Apart from that (which needs to be fixed by adding a field to the
> > struct bio), we believe the code to be quite stable now, so future
...
> Hi,
> 
> Do you have some documentation about the long-term plans? You will have
> to add an additional field to bio, of course, but there is one more
> thing: the schedulers will have to be integrated into the GEOM in an
> "invisible" way. I.e. instead of /dev/ad0-sched-s1f the users should see
> only /dev/ad0 like they're used to, and get the schedulers by default.
> Otherwise, your work will not get much use.

well, if one is comfortable with the schedulers he can just
put the right names in /etc/fstab.

I think the usefulness of 'invisible' classes is more when adding
or removing geom classes on the fly, but perhaps this requires
support in the geom nodes themselves.

In any case I was hoping to discuss this issue later,
either at bsdcan or in the mailing list, once I understand
the implications a bit more.

	cheers
	luigi