On Mon, Feb 01, 2010 at 10:25:52AM +0100, Alexander Graf wrote: > We don't know beforehand if a user will use the commit comnand during > tje runtime of the vm. > > IMHO it'd be best to always open backing files read only and try to > open them for write access on the commit command. That command can > then fail gaciously.
That's another option. Basically this means opening another BlockDriverState for the backing device that is writeable inside bdrv_commit().
