There's OverlayFS. It does exactly what you want, although it was created for di...

		vog on April 24, 2016 \| parent \| context \| favorite \| on: Reversing the Petya ransomware with constraint sol... There's OverlayFS. It does exactly what you want, although it was created for different use cases (Live CDs, layered images as used by Docker, etc.): https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux....