From: Douglas Gilbert <dougg@torque.net>
To: linux1394@lightn.org
Cc: Stefan Richter <stefanr@s5r6.in-berlin.de>,
linux1394-user@lists.sourceforge.net, linux-scsi@vger.kernel.org
Subject: Re: Sony VGP-XL1B (200 disk CD/DVD jukebox)
Date: Wed, 15 Nov 2006 11:05:27 -0500 [thread overview]
Message-ID: <455B3AC7.4040208@torque.net> (raw)
In-Reply-To: <1163578190.7801.187.camel@localhost.localdomain>
Josha Foust wrote:
<snip>
> My main remaining concern is with the safe operation of the unload
> command. As I mentioned in a previous email, the media changer is
> perfectly happy to unload a disk from the drive while it is still
> spinning, obviously causing damage to the disk and possibly the changer.
> With the stop command that Dan Dennedy added in his patch to mtx, I can
> get the drive stopped if I retry until the command succeeds. I am
> worried about race conditions, however. Is there a way to lock a SCSI
> device for exclusive access so that I can guarantee a safe unload? I.E.
> that the disk stays stopped while the media changer unloads it.
The PREVENT ALLOW MEDIUM REMOVAL command is defined for
SMC devices (see SPC-3 as SPC-4 has devolved that command
and it is yet to appear explicitly in SMC-3). That isn't
exactly what you asked for but it will impede a START
STOP UNIT (start_bit=0, loej_bit=1) command.
<snip>
Doug Gilbert
prev parent reply other threads:[~2006-11-15 16:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1162685269.7801.16.camel@localhost.localdomain>
[not found] ` <1162713408.7801.86.camel@localhost.localdomain>
2006-11-05 9:57 ` Sony VGP-XL1B (200 disk CD/DVD jukebox) Stefan Richter
2006-11-15 8:09 ` Josha Foust
2006-11-15 16:05 ` Douglas Gilbert [this message]
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