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In practice, if a virDomainNetDef has a virDomainActualNetDef allocated, the ActualNetDef will *always* contain the bandwidth and vlan data from the NetDef (unless there was also a portgroup involved - see networkAllocateActualDevice()). However, virDomainNetGetActual(Bandwidth|Vlan)() were coded to make it appear as if it might be possible to have a valid bandwidth/vlan in the NetDef, but a NULL in the ActualNetDef. Believing this un-truth could lead to writing unnecessarily defensive code when dealing with the virDomainGetActual*() functions, so this patch makes it more obvious: If there is an ActualNetDef, it will always have a copy of the various appropriate bits from its parent NetDef, and the virDomainGetActual* function will *always* return the data from the ActualNetDef, not from the NetDef. The reason for this effective-NOP patch is that a subsequent patch to change virDomainNetDefFormat will rely on the above rule.
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>