In a few places on the server, I had to change code that looked like:

   if (rqstp->rq_vers == 3)
       /* NFSv3 behavior */
   else
       /* NFSv2 behavior */

to:

   if (rqstp->rq_vers > 2)
       /* NFSv3 behavior */
   else
       /* NFSv2 behavior */

so that we would get the NFSv3 behavior, not the NFSv2 behavior,
in NFSv4.  This patch collects all changes of this type.