linux-kernel - Re: [PATCH] NOMMU: Fix MAP_PRIVATE mmap() of objects where the data can be mapped directly

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Message-Id: <20090924150925.06f4fa23.akpm@linux-foundation.org>
Date:	Thu, 24 Sep 2009 15:09:25 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Howells <dhowells@...hat.com>
Cc:	torvalds@...ux-foundation.org, graff.yang@...il.com,
	linux-kernel@...r.kernel.org, dhowells@...hat.com,
	penberg@...helsinki.fi, lethal@...ux-sh.org, mel@....ul.ie,
	gerg@...pgear.com, stable@...nel.org
Subject: Re: [PATCH] NOMMU: Fix MAP_PRIVATE mmap() of objects where the data
 can be mapped directly

On Thu, 24 Sep 2009 15:13:10 +0100
David Howells <dhowells@...hat.com> wrote:

> Fix MAP_PRIVATE mmap() of files and devices where the data in the backing store
> might be mapped directly.  Use the BDI_CAP_MAP_DIRECT capability flag to govern
> whether or not we should be trying to map a file directly.  This can be used to
> determine whether or not a region has been filled in at the point where we call
> do_mmap_shared() or do_mmap_private().
> 
> The BDI_CAP_MAP_DIRECT capability flag is cleared by validate_mmap_request() if
> there's any reason we can't use it.  It's also cleared in do_mmap_pgoff() if
> f_op->get_unmapped_area() fails.
> 

The patch seems -stable-worthy but I see no cc:stable here?

> Note that this fix does the following commit differently:
> 
> 	commit a190887b58c32d19c2eee007c5eb8faa970a69ba
> 	Author: David Howells <dhowells@...hat.com>
> 	Date:   Sat Sep 5 11:17:07 2009 -0700
> 	nommu: fix error handling in do_mmap_pgoff()

I don't understand what you're saying here.

> Reported-by: Graff Yang <graff.yang@...il.com>
> Signed-off-by: David Howells <dhowells@...hat.com>
> Cc: Pekka Enberg <penberg@...helsinki.fi>
> Cc: Paul Mundt <lethal@...ux-sh.org>
> Cc: Mel Gorman <mel@....ul.ie>
> Cc: Greg Ungerer <gerg@...pgear.com>

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