Re: Reattach/redetect allways connected umass device - is it possible ?
Bernd Walter <[email protected]>
| Newsgroups | gmane.os.freebsd.current,gmane.os.freebsd.devel.mobile |
|---|---|
| Message-ID | <[email protected]> |
On Mon, Mar 28, 2005 at 03:33:38PM +0200, Poul-Henning Kamp wrote: > In message <[email protected]>, Bernd Walter writes: > >On Mon, Mar 28, 2005 at 02:13:16PM +0200, Poul-Henning Kamp wrote: > >> In message <[email protected]>, 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. > > > >At least with (most) SCSI devices you get a media changed exception > >on the first access after that. > > Yes, but sane people would argue that is one turn too late in the > game, whouldn' they ? Ack. > We should get an async event as soon as the media disappears. Well - the without a request the drive has no transaction handle to contact the host. And we don't always have a physcial SCSI bus - e.g. USB devices can't contact the host without the host issuing a transfer. If you want media change events earlier we have to explizitly ask the devices. -- B.Walter BWCT http://www.bwct.de [email protected] [email protected] _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[email protected]"