[jjobi]

I would say image layer file system is not that hard to solve if you approach the problem correctly. It looks like all prior attempts tried to use general purpose solutions and in some cases a combination of those (for example, overlay on top of ext4) for dealing with a much smaller problem and ran into unnecessary complications. A lot of the complexities in a general purpose solution is unwarranted for a image layering file system.

We looked at the requirements of a docker storage driver and built a solution from scratch, just to address those efficiently and nothing else.