linux-kernel - Re: [PATCH] sd: do not set changed flag on all unit attention conditions

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Date:	Tue, 17 Jul 2012 10:54:54 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH] sd: do not set changed flag on all unit attention conditions

Il 17/07/2012 10:40, James Bottomley ha scritto:
>> > 
>> > It's not specific to virtio-scsi, in fact I expect that virtio-scsi will
>> > be almost always used with non-removable disks.
>> > 
>> > However, QEMU's SCSI target is not used just for virtio-scsi (for
>> > example it can be used for USB storage), and it lets you mark a disk as
>> > removable---why? because there exists real hardware that presents itself
>> > as an SBC removable disk.  The only thing that is specific to
>> > virtualization, is support for online resizing (which generates a unit
>> > attention condition CAPACITY DATA HAS CHANGED).
> So what's the problem?  If you're doing pass through of a physical disk,
> we pick up removable from its inquiry string ... a physical removable
> device doesn't get resized.  If you have a virtual disk you want to
> resize, you don't set the removable flag in the inquiry data.

In practice people will do what you said, and it's not a problem.

However, there's nothing that prevents you from running qemu with a
removable SCSI disk, and then resizing it.  I would like this to work,
because SBC allows it and there's no reason why it shouldn't.

Paolo
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