Re: [v2][PATCH] [v2] Revalidate page->mapping indo_generic_file_read()

[Andrew Morton]

On Fri, 05 Nov 2010 14:16:15 -0700
Dave Hansen <dave@xxxxxxxxxxxxxxxxxx> wrote:

> --- linux-2.6.git/mm/filemap.c~is_partially_uptodate-revalidate-page	2010-11-03 13:49:21.000000000 -0700
> +++ linux-2.6.git-dave/mm/filemap.c	2010-11-04 06:59:08.000000000 -0700
> @@ -1016,6 +1016,9 @@ find_page:
>  				goto page_not_up_to_date;
>  			if (!trylock_page(page))
>  				goto page_not_up_to_date;
> +			/* Did it get truncated before we got the lock? */
> +			if (!page->mapping)
> +				goto page_not_up_to_date_locked;
>  			if (!mapping->a_ops->is_partially_uptodate(page,
>  								desc, offset))
>  				goto page_not_up_to_date_locked;

whoops.
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