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Re:Reversing the Petya ransomware with constraint solvers by vog on Sunday April 24, 2016 @07:50AM (#11559371)
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....

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