On Tue, Jun 17, 2014 at 05:53:52PM -0400, Jeff Cody wrote:
> Now that active layer block-commit is supported, the 'top' argument
> no longer needs to be mandatory.
> 
> Change it to optional, with the default being the active layer in the
> device chain.
> 
> Reviewed-by: Eric Blake <eblake@redhat.com>
> Reviewed-by: Benoit Canet <benoit@irqsave.net>
> Signed-off-by: Jeff Cody <jcody@redhat.com>
> ---
>  blockdev.c             | 16 ++++++++++++++--
>  qapi/block-core.json   |  7 ++++---
>  qmp-commands.hx        |  5 +++--
>  tests/qemu-iotests/040 | 28 ++++++++++++++++++----------
>  4 files changed, 39 insertions(+), 17 deletions(-)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>