From: Arnd Bergmann <arnd@arndb.de>
To: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Subject: Re: [PATCH 41/44 take 2] [UBI] gluebi unit header
Date: Sun, 18 Feb 2007 23:37:51 +0100
User-Agent: KMail/1.9.6
Cc: Artem Bityutskiy <dedekind@infradead.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Christoph Hellwig <hch@infradead.org>,
       Frank Haverkamp <haver@vnet.ibm.com>,
       Thomas Gleixner <tglx@linutronix.de>,
       David Woodhouse <dwmw2@infradead.org>
References: <20070217165424.5845.4390.sendpatchset@localhost.localdomain> <200702180315.25067.arnd@arndb.de> <20070218030217.GH1038@crusty.rchland.ibm.com>
In-Reply-To: <20070218030217.GH1038@crusty.rchland.ibm.com>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 8BIT
Content-Disposition: inline
Message-Id: <200702182337.53314.arnd@arndb.de>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1490
Lines: 30

On Sunday 18 February 2007 04:02:17 Josh Boyer wrote:
> On Sun, Feb 18, 2007 at 03:15:23AM +0100, Arnd Bergmann wrote:
> > On Sunday 18 February 2007 03:04, Josh Boyer wrote:
> > > No, the MTD interface isn't flawed. ?gluebi is present to make things
> > > like JFFS2 work on top of UBI volumes with very little adaptations. ?If
> > > you go changing _every_ MTD user to now use either an MTD device or a
> > > native UBI device, then the code for those users just gets bloated.
> >
> > Right, that was my point. If the MTD API in the kernel is not flawed, why
> > do we need the 'native' UBI interface? Just merge gluebi into UBI and
> > get rid of the extra abstraction.
>
> That suggestion came up several times. ?gluebi represents a compromise
> between the two groups. ?IIRC, the issue was that representing UBI volumes
> as MTD devices only makes sense in the dynamic volume case. ?Static UBI
> volumes require special write/update handling and so there was a need for
> a native interface anyway.

Which brings be back to my original point ;-)

I'm sure this has been discussed before, but I'd still like to understand
what is so special with 'static UBI volumes' that they can't be used with
a slightly extended MTD interface.

	Arnd <><
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/