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

From: Mike Christie
Date: Tue Jul 17 2012 - 14:45:50 EST

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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