xfs: factor out a xfs_bmap_is_real_extent helper
This checks for all the non-normal extent types, including handling both encodings of delayed allocations. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com> Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
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