xfs: add rmap btree stats infrastructure
Originally-From: Dave Chinner <dchinner@redhat.com> The rmap btree will require the same stats as all the other generic btrees, so add all the code for that now. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
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