2.9.11

• Finish documentation
• Fix nbd r/w crash when using file based backend storage
• Add features to backy ls.
  This is an incompatible change to the previous behavour of ls, however
  nobody has ever needed a list of blocks for a version, so this should
  not bother anyone.

2.9.9

Finalizing deb so that it is directly usable in ubuntu 16.04