VFS: Enable filesystems and to hook certain functions for copying and
   freeing locks using the new struct file_lock_operations.

VFS: Enable lock managers (i.e. lockd) to hook functions for
   comparing lock ownership using the new struct
   lock_manager_operations.
Signed-off-by: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>