Date: Mon, 28 Mar 2005 16:41:35 +0200 From: Bernd Walter <ticso@cicely12.cicely.de> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: ticso@cicely.de Subject: Re: Reattach/redetect allways connected umass device - is it possible ? Message-ID: <20050328144135.GI14532@cicely12.cicely.de> In-Reply-To: <20050328143801.GH14532@cicely12.cicely.de> References: <20050328134856.GF14532@cicely12.cicely.de> <32733.1112019870@critter.freebsd.dk> <20050328143801.GH14532@cicely12.cicely.de>
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On Mon, Mar 28, 2005 at 04:38:02PM +0200, Bernd Walter wrote: > On Mon, Mar 28, 2005 at 04:24:30PM +0200, Poul-Henning Kamp wrote: > > In message <20050328134856.GF14532@cicely12.cicely.de>, Bernd Walter writes: > > > > >> Driver support for this is not really meaterialized and therefore > > >> the model now is that when the media is ejected the geom device > > >> is removed and a new one created right away, even if a new media > > >> is not inserted right away. > > > > > >Do you get eject notifications from any device type? > > > > Right now I belive floppy disks DTRT. > > Interesting. > > > >One of my problems is that it is possible with SCSI MO drives to > > >eject the media, reinsert a new one and errously continue to work > > >with the old GEOM layout. > > >I already trashed the data on one media by forgetting to trigger > > >a reprobe - since then I use a mount script. > > > > Well, I have no idea how to pull the information out of the CAM/SCSI > > code, but I'm sure there is _some_ way it can be done. > > There is the test unit ready command. > Either it returns OK, or you may get usefull sense data. > Here is an example: This even works for my USB flash drives: [67]cicely13# camcontrol tur -n da -u 1 -v Unit is not ready (pass1:umass-sim0:0:0:0): TEST UNIT READY. CDB: 0 0 0 0 0 0 (pass1:umass-sim0:0:0:0): CAM Status: SCSI Status Error (pass1:umass-sim0:0:0:0): SCSI Status: Check Condition (pass1:umass-sim0:0:0:0): NOT READY asc:3a,0 (pass1:umass-sim0:0:0:0): Medium not present Exit 1 [68]cicely13# camcontrol tur -n da -u 1 -v Unit is not ready (pass1:umass-sim0:0:0:0): TEST UNIT READY. CDB: 0 0 0 0 0 0 (pass1:umass-sim0:0:0:0): CAM Status: SCSI Status Error (pass1:umass-sim0:0:0:0): SCSI Status: Check Condition (pass1:umass-sim0:0:0:0): UNIT ATTENTION asc:28,0 (pass1:umass-sim0:0:0:0): Not ready to ready change, medium may have changed Exit 1 [69]cicely13# camcontrol tur -n da -u 1 -v Unit is ready [71]cicely13# camcontrol tur -n da -u 4 -v Unit is not ready (pass4:umass-sim1:1:0:0): TEST UNIT READY. CDB: 0 0 0 0 0 0 (pass4:umass-sim1:1:0:0): CAM Status: SCSI Status Error (pass4:umass-sim1:1:0:0): SCSI Status: Check Condition (pass4:umass-sim1:1:0:0): UNIT ATTENTION asc:28,0 (pass4:umass-sim1:1:0:0): Not ready to ready change, medium may have changed Exit 1 [72]cicely13# camcontrol tur -n da -u 4 -v Unit is ready Those are both more or less random flash card readers, so it seems that even cheap devices work. -- B.Walter BWCT http://www.bwct.de bernd@bwct.de info@bwct.de
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