I know UML does it above the kernel. I wonder if there's some way to do this so you could, say, mount a CDROM and RAM so that all writes go to RAM, effectively making a CDROM that you could modify until you unmounted it.
It would also be good for flash memory where a device can only do so many writes before it dies. I'm thinking of trying to boot off either of these two, a CDROM or a flash disk, but while the system is running it needs to be able to write things. Right now I've got a <400m filesystem in RAM.
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