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Currently we build the JSON object for the "block_set_io_throttle" command using the knowledge that a NULL for a support*Options boolean would essentially ignore the rest of the arguments. This may not work properly if some capability was backported, plus it just looks rather ugly. So instead, build the "base" arguments and then if the support*Option bool capability is set, add in the arguments on the fly. Then append those arguments to the basic command and send to qemu.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>