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2012-12-11Btrfs: cleanup duplicated division functionsMiao Xie
div_factor{_fine} has been implemented for two times, cleanup it. And I move them into a independent file named math.h because they are common math functions. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>