[libvirt] [PATCH 0/2] Fix two problems with creating new storage volumes

Both of these problems can occur only if a new storage volume is created by copying it from an existing volume. The first is a problem if the new volume is longer than the old (the new volume won't be zero-filled at the end), and the second happens if the new and old volumes are the same length (fsync wouldn't be called at the end of writing the new volume) (actually, before the 1st fix is applied, that problem would exist for *all* new volumes created as copies of existing volumes).