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Subject: Re: [RFC][PATCH] mm: fix page_mkclean() vs non-linear vmas
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nick Piggin <npiggin@suse.de>, Miklos Szeredi <miklos@szeredi.hu>,
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Date: Wed, 07 Mar 2007 19:12:00 +0100
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On Wed, 2007-03-07 at 10:00 -0800, Linus Torvalds wrote:
> 
> On Wed, 7 Mar 2007, Peter Zijlstra wrote:
> > 
> > I'm not at all happy with this, but plain disallowing remap_file_pages on bdis
> > without BDI_CAP_NO_WRITEBACK seems to offend some people, hence restrict it to
> > root only.
> 
> I don't think that's a viable approach. Nonlinear mappings would normally 
> be used by databases, and you don't want to limit databases to be run by 
> root only.

It was claimed that they use it on tmpfs only, not on a 'real'
filesystem.