Filesystem UID mapping for user namespaces: yet another shiftfs

The idea of an ID-shifting virtual filesystem that would remap user and group IDs before passing requests through to an underlying real filesystem has been around for a few years but has never made it into the mainline. Implementations have taken the form of shiftfs and shifting bind mounts. Now there is yet another approach to the problem under consideration; this one involves a theoretically simpler approach that makes almost no changes to the kernel's filesystem layer at all.

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