linux-kernel - Re: [PATCH 2/2] init, mount: export the name_to_dev

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Message-ID: <20100525183051.GA692@redhat.com>
Date:	Tue, 25 May 2010 14:30:51 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Will Drewry <wad@...omium.org>, Alasdair G Kergon <agk@...hat.com>,
	linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
	Nick Piggin <npiggin@...e.de>, Tejun Heo <tj@...nel.org>,
	Scott James Remnant <scott@...ntu.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Harald Hoyer <harald@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [PATCH 2/2] init, mount: export the name_to_dev_t symbol

On Tue, May 25 2010 at  1:21pm -0400,
Christoph Hellwig <hch@...radead.org> wrote:

> On Tue, May 25, 2010 at 11:11:33AM -0500, Will Drewry wrote:
> > In addition to getting rid of the code duplication, I'd like device-mapper
> > to be able to resolve slave devices at boot-time to accommodate a
> > do_mounts_dm.c equivalent to do_mounts_md.c:
> 
> So please add a do_mounts_dm.c instead of pushing this somewhere it
> doesn't belong to.

He is proposing doing just that, you cut out the patchwork url he
already shared: https://patchwork.kernel.org/patch/101024/

Will's intentions are good: avoid code duplication.

He is also trying to keep DM-specific common code in drivers/md/

So in this instance, avoiding the need to export name_to_dev_t would
require splitting the internal DM __table_get_device (or more likely:
dm_get_device) out to a public facing interface that takes a dev_t.

Mike
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