On Mon, Feb 10, 2020 at 03:37:20PM -0600, Eric Blake wrote: > For now, only 2 of those 16 bits are defined: NBD_INIT_SPARSE (the > image has at least one hole) and NBD_INIT_ZERO (the image reads > completely as zero); the two bits are orthogonal and can be set > independently, although it is easy enough to see completely sparse > files with both bits set.
I think I'm confused about the exact meaning of NBD_INIT_SPARSE. Do you really mean the whole image is sparse; or (as you seem to have said above) that there exists a hole somewhere in the image but we're not saying where it is and there can be non-sparse parts of the image? Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into KVM guests. http://libguestfs.org/virt-v2v