dadi block device driver mode
Usage,
make KROOT=linux_kernel_dir or just make, to use host kernel build environment
sudo insmod ./vbd.ko
By default, overlay_vdb uses /test.lsmtz file as file backend, but it can be configured as parameter
sudo insmod ./vbd.ko backfile=/tmp/layer0.lsmtz
after that,
mount /dev/vbd0 /mnt