linux-kernel - Re: [PATCH] locks: new procfs lockinfo

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Message-Id: <20120223130106.8d976093.akpm@linux-foundation.org>
Date:	Thu, 23 Feb 2012 13:01:06 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	dave@....org, "J. Bruce Fields" <bfields@...ldses.org>,
	Matthew Wilcox <matthew@....cx>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] locks: new procfs lockinfo

On Wed, 22 Feb 2012 16:38:27 -0800
ebiederm@...ssion.com (Eric W. Biederman) wrote:

> Davidlohr Bueso <dave@....org> writes:
> 
> > From: Davidlohr Bueso <dave@....org>
> >
> > Based on our previous discussion https://lkml.org/lkml/2012/2/10/462 we came to
> > agree on deprecating the current /proc/locks in favor of a more extensible interface.
> > The new /proc/lockinfo file exports similar information - except instead of maj:min the
> > device name is shown - and entries are formated like those in /proc/cpuinfo, allowing us
> > to add new entries without breaking userspace.
> 
> You can't know the device name, attempt to say what you don't know seems
> very dangerous.  It may be reasonable to simply give the deivce number
> and not split the device number into major/minor any more and I am
> concerned about reality.

I don't think we've ever been told any *reason* for switching from
major:minor to device-name.  This is a problem.

And yes, major:minor reliably and uniquely identifies the device.  I'm
not sure that the human-readable string which is largely a convenience
thing is as reliable as this.

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