blk_rq_map_kern
EXPORT_SYMBOL(blk_rq_map_kern);
ret = blk_rq_map_kern(req, buffer, buffer_length, GFP_KERNEL);
err = blk_rq_map_kern(req, report_buf, report_len, GFP_KERNEL);
err = blk_rq_map_kern(req, id_str, VIRTIO_BLK_ID_BYTES, GFP_KERNEL);
ret = blk_rq_map_kern(req, buffer, bufflen, GFP_KERNEL);
err = blk_rq_map_kern(rq, buffer, bytes, GFP_NOIO);
ret = blk_rq_map_kern(req, buffer, bufflen, GFP_NOIO);
int blk_rq_map_kern(struct request *rq, void *kbuf, unsigned int len,