Hugepage cleanup and bugfix

[David Gibson]

Hi, this is a revised version of Andrew Barry's fix for the hugepage
race between unmount and quota update.  In fact it's not just that
race which is a problem, it's a more general use-after-free problem on
fs inodes from the hugepage code.

Despite all the abstract talk in the patch comments about layering
violations, this fixes a real, exploitable, crash bug which has been
in the kernel for a very long time now.

Andrew, please apply.

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