int vio_reset_bio(struct vio *vio, char *data, bio_end_io_t callback,
		  unsigned int bi_opf, physical_block_number_t pbn)
int vio_reset_bio(struct vio *vio, char *data, bio_end_io_t callback,
		  blk_opf_t bi_opf, physical_block_number_t pbn)