[$] NFS: the new millennium

The network filesystem (NFS) protocol has been with us for nearly 40 years.While defined initially as a stateless protocol, NFS implementations havealways had to manage state, and that need has been increasingly built intothe protocol over successive revisions. The early days of NFS werediscussed, with a focus on state management, in the first part of this series. This articlecompletes the job with a look at the evolution of NFS since, approximately,the beginning of this millennium.