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

From: Bernd Walter (ticso_at_cicely12.cicely.de)
Date: 03/28/05

  • Next message: Bernd Walter: "Re: Reattach/redetect allways connected umass device - is it possible ?" 
    Date: Mon, 28 Mar 2005 15:40:21 +0200
To: Poul-Henning Kamp <phk@phk.freebsd.dk>

    On Mon, Mar 28, 2005 at 03:33:38PM +0200, Poul-Henning Kamp wrote:
    > In message <20050328131318.GC14532@cicely12.cicely.de>, Bernd Walter writes:
    > >On Mon, Mar 28, 2005 at 02:13:16PM +0200, Poul-Henning Kamp wrote:
    > >> In message <20050328114633.GZ14532@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.
    > >
    > >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
bernd@bwct.de                                  info@bwct.de
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  • Next message: Bernd Walter: "Re: Reattach/redetect allways connected umass device - is it possible ?"

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