bdev_dump
return (bdev_dump(vp->v_rdev, addr, (daddr_t)bn, (int)count));
error = bdev_dump(ip->i_dev, addr, dbn, ndbs);
return (bdev_dump(dev, addr, blkno, nblk));
extern int bdev_dump(dev_t, caddr_t, daddr_t, int);