Re: [Qemu-devel] [PATCH 1/2] iotests: 030 TestParallelOps non-shared base node

[Alberto Garcia]

On Thu 21 Mar 2019 03:53:41 PM CET, Kevin Wolf wrote:
>> >>> I think, the correct way, which will support these correct cases
>> >>> (which however don't look like real use cases) is removing base
>> >>> from stream view. Stream should operate instead using
>> >>> bottom-node.
>> >> 
>> >> What is bottom-node?
>> >
>> > I mean bottom intermediate node, or a node which backing is base.
>> 
>> But the base node is needed, because even if the job doesn't operate
>> directly on it it does use the name of the image to store on the top
>> image's backing file string.
>
> That's a one-time thing at the end of the operation, though. I don't
> think there is a problem with replacing the base node while the job is
> running. It just needs to look at backing_bs(base_node) when it
> rewrites the backing file string.

Right, there's a 'backing-file' parameter so the user can specify the
string, but by default it's taken from base.

Berto