xfs: provide a query_range function for freespace btrees
Implement a query_range function for the bnobt and cntbt. This will be used for getfsmap fallback if there is no rmapbt and by the online scrub and repair code. Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com> Reviewed-by: NBrian Foster <bfoster@redhat.com>
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