Date: Sat, 29 Nov 2008 12:56:07 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Matthew Wilcox <matthew@wil.cx>
Cc: Matthew Garrett <mjg@redhat.com>, Jamie Lokier <jamie@shareable.org>,
       J?rn Engel <joern@logfs.org>, Christoph Hellwig <hch@infradead.org>,
       Randy Dunlap <randy.dunlap@oracle.com>, linux-kernel@vger.kernel.org,
       linux-fsdevel@vger.kernel.org, mingo@redhat.com, val.henson@gmail.com
Subject: Re: [PATCH v2 2/2] relatime: Allow making relatime the default
 behaviour
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On Sat, 29 Nov 2008 13:38:57 -0700 Matthew Wilcox <matthew@wil.cx> wrote:

> On Sat, Nov 29, 2008 at 12:32:20PM -0800, Andrew Morton wrote:
> > The standard, usual, expected way of modifying a filesystem's behaviour
> > is via mount options.  This is also quite flexible.
> > 
> > Is there some extraordinary reason why the standard interface is not to
> > be used here?
> 
> Because it would have to be managed (and consulted) per ... what?
> vfsmount?  superblock?

Per superblock, of course.

> This is featuritis gone MAD.

No it isn't - it's the expected and standard behaviour.  We have all
the kernel infrastructure and userspace tools in place for doing it
this way.

Modifying the behaviour of all filesystems with a single knob is a
weird thing to do.

MNT_RELATIME itself is already per-superblock.
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