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Date: Fri, 24 Jan 2014 08:48:57 -0500
From: Jeff Cody <jcody@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH] block: do not allow read-only=on and
 snapshot=on to be used together
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To: Kevin Wolf <kwolf@redhat.com>
Cc: pbonzini@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com

On Fri, Jan 24, 2014 at 02:33:19PM +0100, Kevin Wolf wrote:
> Am 14.01.2014 um 20:12 hat Jeff Cody geschrieben:
> > Having both read-only=on and snapshot=on together does not make sense;
> > currently, the read-only argument is effectively ignored for the
> > temporary snapshot.  To prevent confusion, disallow the usage of both
> > 'snapshot=on' and 'read-only=on'.
> > 
> > Signed-off-by: Jeff Cody <jcody@redhat.com>
> 
> This breaks in a surprising way:
> 
> $ softmmu/qemu-system-x86_64 -drive file=~/images/hd.img,snapshot=on
> ... works fine ...
> 
> $ qemu-system-x86_64 -drive file=~/images/hd.img -snapshot
> qemu-system-x86_64: invalid option combination: read-only and snapshot
> 
> qemu-iotests case 051 catches this. I'll have to remove this patch and
> the follow-up from the queue for now.
>

Odd - OK, I'll follow up on this and submit a series with both patches
(well, likely squashed together), and whatever is needed to fix this
as well.