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Date: Fri, 21 Jan 2011 12:09:59 +0100
From: Kevin Wolf <kwolf@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v2 1/3] scsi-disk: Allow overriding SCSI
	INQUIRY removable bit
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To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: qemu-devel@nongnu.org, Christoph Hellwig <hch@lst.de>, "Justin M. Forbes" <jforbes@redhat.com>, Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

Am 21.01.2011 11:45, schrieb Stefan Hajnoczi:
> On Tue, Jan 18, 2011 at 12:06 PM, Stefan Hajnoczi <stefanha@gmail.com> wrote:
>> On Tue, Jan 18, 2011 at 11:39 AM, Kevin Wolf <kwolf@redhat.com> wrote:
>>> Am 18.01.2011 11:10, schrieb Stefan Hajnoczi:
>>>> Provide the "removable" qdev property bit to override the SCSI INQUIRY
>>>> removable (RMB) bit for non-CDROM devices.  This will be used by USB
>>>> Mass Storage Devices, which sometimes have this guest-visible bit set
>>>> and sometimes do not.  They therefore requires a means for user
>>>> configuration.
>>>>
>>>> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
>>>
>>> Should we print an error message when the user tries to make a CD-ROM
>>> non-removable instead of silently ignoring the option?
>>
>> Good point.  I will add a check in scsi_disk_initfn() for v3.
> 
> Actually this case is hard to check against.  The removable property
> is a boolean that defaults to false.  We can't detect the difference
> between default, cleared, or set.

Hm, I see... Maybe we should make scsi-disk and scsi-cdrom different
devices in the long run, then scsi-cdrom could default to true (or
rather not have the property at all).

> I'm sending out a new version of the patch series that updates
> docs/qdev-device-use.txt to describe how the removable property works.

Okay, let's just document how it works.

Kevin