ionice in FreeBSD?

[Jordi Espasa Clofent]

Hi all,

In Linux exists the ionice(1) for "get/set program io scheduling class 
and priority".

In FreeBSD we've nice(1), renice(8) and even rtprio, idprio(1) but if 
I'm understanding correctly, they're related to CPU priorty only, not to 
I/O.

¿Is there some ionice(1) equivalent in FreeBSD?

-- 
I must not fear. Fear is the mind-killer. Fear is the little-death that 
brings total obliteration. I will face my fear. I will permit it to pass 
over me and through me. And when it has gone past I will turn the inner 
eye to see its path. Where the fear has gone there will be nothing. Only 
I will remain.

Bene Gesserit Litany Against Fear.