Reattach/redetect allways connected umass device - is it possible ?

[Bernd Walter]

On Mon, Mar 28, 2005 at 04:58:31PM +0400, Vladimir Grebenschikov wrote:
> ? ??, 28/03/2005 ? 14:13 +0200, Poul-Henning Kamp ?????:
> > In message <20050328114633.GZ14532 at cicely12.cicely.de>, Bernd Walter writes:
> > 
> > >> camcontrol detach da0; camcontrol rescan all 
> > >> helps, but, it should be much better if it will be issued automatically.
> > >
> > >Yes - GEOM seems to ignore media change signals from drives.
> > >I've added PHK to the recipient list - maybe he has an idea about this
> > >problem.
> > 
> > No, GEOM doesn't ignore any such thing, because as far as I know
> > GEOM doesn't get any such thing to ignore in the first place.
> 
> So, let's imagine following situation:
> 
> We get SCSI BUS with removable da device.
> device detected as da0 and not mounted.
> Device disconnected from SCSI bus.
> And finally, another device with different geometry connected with same
> SCIS ID.

This ist not a *media* exchange - this is a *device* and in
this case even a scbus exchange.

> Please describe how to suppose detect geometry change in this case ?

This is a completely different case.
You get a new device and GEOM gets a new device event.

That your device didn't get disconnected is your problem.
You won't see the new device as long as the old device blocks the
USB event thread.

-- 
B.Walter                   BWCT                http://www.bwct.de
bernd at bwct.de                                  info at bwct.de