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From QEMU docs/interop/qcow2.txt : Byte 20 - 23: cluster_bits Number of bits that are used for addressing an offset within a cluster (1 << cluster_bits is the cluster size). With this patch libvirt will be able to report the current cluster_size for all existing storage volumes managed by storage driver. Signed-off-by: Pavel Hrdina <phrdina@redhat.com> Reviewed-by: Peter Krempa <pkrempa@redhat.com>