Re: [Qemu-devel] [PATCH 2/3] block: add block_backup QMP command

[Eric Blake]

On 04/23/2013 10:25 AM, Stefan Hajnoczi wrote:
> @block-backup
> 
> Start a point-in-time copy of a block device to a new destination.
> 
> @device:  the name of the device whose writes should be mirrored.
> 
> @target: the target of the new image. If the file exists, or if it
>          is a device, the existing file/device will be used as the new
>          destination.  If it does not exist, a new file will be created.
> 
> @format: #optional the format of the new destination, default is to
>          probe if @mode is 'existing', else the format of the source
> 
> @mode: #optional whether and how QEMU should create a new image, default is
>        'absolute-paths'.
> 
> @speed:  #optional the maximum speed, in bytes per second
> 
> Returns: nothing on success
>          If @device is not a valid block device, DeviceNotFound

This starts a new block job type; I assume the existing block-job-cancel
and query-block-jobs can track it.

I'd really love to see us change 'BlockJobInfo' to use an enum for
'type', instead of its open-coded 'str'.  Likewise, the block-job
related events in QMP/qmp-events.txt should be updated to refer to the
enum instead of also being open-coded 'str'.  Will this job be called
"backup"?

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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