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

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Message-ID: <5005B39D.6030905@cs.wisc.edu>
Date:	Tue, 17 Jul 2012 12:49:01 -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 12:45 PM, Mike Christie wrote:
> 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.

Was not done. I meant I saw that patch where virtio-scsi gets that
virtio_scsi_event and kicks of a rescan based off of that.
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