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rq_for_each_segment changed from taking bio_vec * to taking bio_vec. We provide rq_for_each_segment4 which takes both. Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2124