Re: [PATCH v2 0/7] block: Relax restrictions for blockdev-snapshot

[Kevin Wolf]

Am 10.03.2020 um 12:38 hat Kevin Wolf geschrieben:
> This series allows libvirt to fix a regression that its switch from
> drive-mirror to blockdev-mirror caused: It currently requires that the
> backing chain of the target image is already available when the mirror
> operation is started.
> 
> In reality, the backing chain may only be copied while the operation is
> in progress, so the backing file of the target image needs to stay
> disabled until the operation completes and should be attached only at
> that point. Without this series, we don't have a supported API to attach
> the backing file at that later point.
> 
> v2:
> - Added a fix and test case for iothreads [Peter]
> - Added a blockdev-snapshot feature flag to indicate that it's usable
>   for attaching a backing chain to an overlay that is already in
>   write-only use (e.g. as a mirror target) [Peter]

Thanks for review and testing, applied to the block branch.

Kevin