Virt-bmap constructs a mapping of disk block -> file for a disk image.
It requires libguestfs >= 1.29.11, nbdkit >= 1.1, Boost, and pod2man.
`configure' will check the requirements.

Discussion, patches, etc. on the virt-tools mailing list:
http://www.redhat.com/mailman/listinfo/virt-tools-list