FSCACHE support for AFS and NFS

The following is the latest incarnation of David Howells' fscache series.

Please note that the first 12 patches are really cleanups of the NFS client
to prevent inode aliasing: the problem with the current client is that
if the server exports two directories on the same filesystem, then those
will be mapped to different superblocks on the client despite the fact that
they may share files (due to hard links etc). David's patches fix this up
by identifying mountpoints that refer to the same filesystem, and mapping
them into the same superblock.

The fscache stuff proper begins at patch 13/21 and ends at 19/21.

Finally, patches 20 and 21 optimise generic_shutdown_super. The first
fixes up an issue with the autofs code, while the second is the optimisation
proper.

Cheers,
  Trond
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