rumpuser_bio
struct rumpuser_bio *biop;
struct rumpuser_bio bio;
static struct rumpuser_bio bios[N_BIOS];
dobio(struct rumpuser_bio *biop)
void rumpuser_bio(int, int, void *, size_t, int64_t, rump_biodone_fn, void *);
rumpuser_bio(rblk->rblk_fd, op, bp->b_data, bp->b_bcount, off,