blk_rq_map_user_iov 317 block/scsi_ioctl.c ret = blk_rq_map_user_iov(q, rq, NULL, iov, hdr->iovec_count, blk_rq_map_user_iov 753 include/linux/blkdev.h extern int blk_rq_map_user_iov(struct request_queue *, struct request *,