Once upon a time, kernel developers would post their contributions on the linux-kernel mailing list. Now they issue press releases instead. Along those lines, Levanta (the company once known as Linuxcare) has announced
the availability of MapFS. This GPL-licensed module allows a read-only filesystem to be mounted locally for write access, with any changes being kept on the local system. It looks like another implementation of the "translucent filesystem" idea.
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