first set of vfs scale patches

Does not contain inode lock patches yet, I've not
quite finished porting them yet, but even when I do I think they should
get some time in linux-next and some more time for people to review them
before going upstream. So let's wait for next release on those?

This patchset contains:
* some misc bits
* rwlock->spinlock for fs_struct lock
* files_lock cleanup
* tty files list bugfix
* files_lock scaling
* vfsmount_lock scaling

These should all be in good shape for review and hopefully merging, so
please let me know if I need to fix anything.

Thanks,
Nick


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