d56707766e
When creating a snapshot with _REUSE_EXTERNAL when the pre-created image does not directly link to the current active layer libvirt would re-detect the backing chain incorrectly and it would not match with qemu's view. Since the configuration is an operator mistake, document that only the top layer image gets inserted.
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>