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Input to the volume cloning code is a source volume and an XML descriptor for the new volume. It is possible for the new volume to have a greater size than source volume, at which point libvirt will just stick 0s on the end of the new image (for raw format anyways). Unfortunately a logic error messed up our tracking of the of the excess amount that needed to be written: end result is that sparse clones were made very much non-sparse, and cloning regular disk images could end up excessively sized (though data unaltered). Drop the 'remain' variable entriely here since it's redundant, and track actual allocation directly against the desired 'total'.
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>