xfs: handle cow fork in xfs_bmap_trace_exlist
By inspection, xfs_bmap_trace_exlist isn't handling cow forks, and will trace the data fork instead. Fix this by setting state appropriately if whichfork == XFS_COW_FORK. ()___() < @ @ > | | {o_o} (|) Signed-off-by: NEric Sandeen <sandeen@redhat.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NDave Chinner <david@fromorbit.com>
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