blk_recalc_rq_segments 1232 block/blk-core.c 	rq->nr_phys_segments = blk_recalc_rq_segments(rq);
blk_recalc_rq_segments 1507 block/blk-core.c 		req->nr_phys_segments = blk_recalc_rq_segments(req);
blk_recalc_rq_segments  239 block/blk.h    unsigned int blk_recalc_rq_segments(struct request *rq);