Re: [Qemu-devel] [PATCH for-2.3 4/4] blockdev: acquire AioContext in change-backing-file

[Max Reitz]

On 2014-11-19 at 15:19, Stefan Hajnoczi wrote:
> Add dataplane support to the change-backing-file QMP commands.  By
> acquiring the AioContext we avoid race conditions with the dataplane
> thread which may also be accessing the BlockDriverState.
>
> Note that this command operates on both bs and a node in its chain
> (image_bs).  The bdrv_chain_contains(bs, image_bs) check guarantees that
> bs and image_bs are in the same AioContext.
>
> Signed-off-by: Stefan Hajnoczi <address@hidden>
> ---
>   blockdev.c                      | 19 +++++++++++++------
>   hw/block/dataplane/virtio-blk.c |  1 +
>   2 files changed, 14 insertions(+), 6 deletions(-)

Reviewed-by: Max Reitz <address@hidden>