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

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Message-ID: <20100525155535.GA811@infradead.org>
Date:	Tue, 25 May 2010 11:55:35 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Will Drewry <wad@...omium.org>
Cc:	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>, agk@...hat.com,
	snitzer@...hat.com
Subject: Re: [PATCH 2/2] init, mount: export the name_to_dev_t symbol

On Tue, May 25, 2010 at 10:46:51AM -0500, Will Drewry wrote:
> This change only adds EXPORT_SYMBOL() for name_to_dev_t.
> 
> name_to_dev_t is in use outside of init/ but is not 'officially'
> exported.  It provides behavior that is useful for any code that may be
> need to lookup a block device by major:minor or registered kernel name,
> especially before there is a root filesystem.
> 
> Hopefully, this is the appropriate use of EXPORT_SYMBOL().  This
> specific function seems to be a stable interface and is available
> in include/linux/mount.h.

NACK.  It's really a hack for the boot code, there's no offical name to
dev_t mapping.

What are you trying to use it for?

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