linux-kernel - Re: [PATCH] [-mm] FS: file name must be unique in the same dir in procfs

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Message-Id: <20070910004927.323763ad.akpm@linux-foundation.org>
Date:	Mon, 10 Sep 2007 00:49:27 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	Oliver Neukum <oliver@...kum.org>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH] [-mm] FS: file name must be unique in the same dir in
 procfs

On Mon, 20 Aug 2007 23:50:05 +0800 Zhang Rui <rui.zhang@...el.com> wrote:

> Hi, Oliver,
> Thanks for your comments,
> 
> On Mon, 2007-08-20 at 18:45 +0800, Oliver Neukum wrote:
> > Am Montag 20 August 2007 schrieb Zhang Rui:
> > > Files name must be unique in the same directory.
> > >
> > > Bug is reported here:
> > > http://bugzilla.kernel.org/show_bug.cgi?id=8798
> > 
> > Then I'd say fix the callers.
> But at least the callers need to be told that something is wrong first.
> 
> >  This will paper over bugs.
> Hmm, what kind of bugs?
> callers always need to check the return value when calling
> proc_mkdir/create_proc_entry, don't they?
> 

Yes, but there's some risk that such a change will cause a
presently-working system to stop working.  It's quite likely, if that
system is checking the procfs-creation return value.

So I think it'd be best if we were to detect the duplication and print a
warning (which should include, if possible, the full pathname and a
dump_stack()) and then the code should proceed as normal: permit the
duplicated entry and return success.

Then, when such duplicates are reported, we can work out what to do about
them on a case-by-case basis.

(btw, please feed your patches through scripts/checkpatch.pl - that one had
a remarkably high coding-style-error-density).
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