How do I find my buffers once I have lost them?

[sramtrc at windy.dsir.govt.nz]

PS - I should add that what I want to do is copy directly from user space to
a device. Physio is supposed to do this and it does. But my physio cheats. It
uses copyin/copyout to move the user data into kernel data space. That's the
copy I would like to avoid. I noticed that Sun's physio does not do a copy.
But I guess it uses a different mechanism for accessing user space.

 Tony Cooper
 sramtrc at albert.dsir.govt.nz