Merge branch 'vfs.file' of gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs into...

Merge prerequisities from the vfs git tree for the following series that
introduces kmem_cache_args. The vfs.file branch includes the addition of
kmem_cache_create_rcu() which was needed in vfs for the filp cache
optimization. The following series refactors this code.