* Big state banks are inefficient, primitive

* Privately owned banks lack national scale

* Situation deters non-oil investment by foreigners

* Foreign banks entering gradually

* Central bank revising banking laws

BAGHDAD, March 7 (Reuters) - An Iraqi businessman, trying to cash in on the billions of dollars pouring into the country from lucrative oil contracts, complains that his biggest headache is not bomb attacks or sectarian politics but primitive banks..............