Re: [libvirt] [PATCH v3] snapshot: fix rollback failure in transaction mode

BZ:https://bugzilla.redhat.com/show_bug.cgi?id=843372 when qemu supports the 'transaction' monitor command, and libvirt's --reuse-ext flag was not specified, libvirt created a stub file with zero size in first place. After the failure of QEMU transaction command performing qcow2 snapshots on more than one drives, the stub file is left behind with non-empty by the QEMU transaction command. In order to unlink the file, the patch removes the file size checking.