Stacked mounts of procfs/linprocfs

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

Hey,

I just noticed that we can produce stacked mounts of procfs and linprocfs.  Probably not what we want:

% mount|grep procfs
procfs on /proc (procfs, local)
procfs on /proc (procfs, local)

I tried looking into where to prevent this, probably in the vfsmount routine.  However I'm a bit out of the loop concerning the namecache, so I'm not sure when I need to lock/release what.

Nevertheless I think we should prevent this behavior.

cheers
 simon

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