On Tue, Mar 06, 2018 at 11:23:16AM -0800, Matthew Wilcox wrote:
> From: Matthew Wilcox <mawil...@microsoft.com>
> 
> The current implementation of btrfs_page_exists_in_range() gives the
> wrong answer if the workingset code has stored a shadow entry in the
> page cache.  The filemap_range_has_page() function does not have this
> problem, and it's shared code, so use it instead.

I'm going to merge this patch. btrfs_page_exists_in_range was full of
bugs from the beginning so I'm more than happy to use the shared one.
Thanks.

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