Re: [Qemu-devel] Image streaming and live block copy

[Kevin Wolf <kwolf@redhat.com>]

Am 17.06.2011 10:57, schrieb Stefan Hajnoczi:
> On Fri, Jun 17, 2011 at 9:36 AM, Kevin Wolf <kwolf@redhat.com> wrote:
>> By the way, we'll get problems with the colon syntax. Without -blockdev
>> we'll have to invent a new syntax, maybe with brackets:
>>
>> blkstream:[nbd:localhost]:out.qcow2
> 
> Embedding block driver options in filenames is getting worse as time
> goes on.  

Well, yes. We need -blockdev for a sane way to express complex relations
between BlockDriverStates. But then, we'll also want to have convenient
shortcuts for manual use, and that may be something like the existing
colon syntax. I really don't feel like typing three full -blockdev
parameters for qcow2 on blockdbg on raw.

> I recently tried to refactor and eliminate
> QEMUOptionParameter so that we only use QemuOpts instead of two
> different option APIs.  Part of that involves keeping separate
> per-block driver (i.e. -blockdev) options lists, which would allow us
> to pass proper options to block drivers instead of embedding them in
> the filename.

Aren't these completely independent things? QEMUOptionParameter is used
for image creation, whereas filenames are used for opening images. I
think you can change one without changing the other.

Kevin