xfs: refactor xfs_iread_extents to use xfs_btree_visit_blocks
xfs_iread_extents open-codes everything in xfs_btree_visit_blocks, so refactor the btree helper to be able to iterate only the records on level 0, then port iread_extents to use it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
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