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

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Message-ID: <5005B2AC.6020102@cs.wisc.edu>
Date:	Tue, 17 Jul 2012 12:45:00 -0600
From:	Mike Christie <michaelc@...wisc.edu>
To:	Paolo Bonzini <pbonzini@...hat.com>
CC:	Christoph Hellwig <hch@...radead.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH] sd: do not set changed flag on all unit attention conditions

On 07/17/2012 10:47 AM, Paolo Bonzini wrote:
> Il 17/07/2012 18:36, Christoph Hellwig ha scritto:
>>>> There's no such thing in the market today as a removable disk that's
>>>> resizeable.  Removable disks are for things like backup cartridges and
>>>> ageing jazz drives.  Worse: most removeable devices today are USB card
>>>> readers whose standards compliance varies from iffy to non existent.
>>>> Resizeable disks are currently the province of storage arrays.
>> The virtual disks exported by aacraid are both marked removable and
>> can be resized.
> 
> Do they report resizing via unit attention?  I can skip this part on
> removable virtio-scsi disks if that's what real hardware does, it would
> also work.
> 

Not sure if we are talking about the same thing.

So can virtio-scsi send a UA with asc/ascq that indicates the lun
changed size? Other drivers do this. I updated Hannes's patches the
other day to support UAs like those in userspace.

I just saw the code in the patch where virtio-scsi gets that event.
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