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

[Kevin Wolf]

Am 21.03.2019 um 15:23 hat Alberto Garcia geschrieben:
> On Thu 21 Mar 2019 09:30:26 AM CET, Vladimir Sementsov-Ogievskiy wrote:
> > 20.03.2019 20:25, Alberto Garcia wrote:
> >> On Wed 20 Mar 2019 10:35:27 AM CET, Vladimir Sementsov-Ogievskiy wrote:
> >>>> Maybe at least this kind of freezing isn't the right tool for block
> >>>> jobs, after all.
> >>>
> >>> 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.

Kevin