NSM: Move nsm_use_hostnames to mon.c

Clean up.

Treat the nsm_use_hostnames global variable like nsm_local_state.
Note that the default value of nsm_use_hostnames is still zero.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

fs/lockd/mon.c

@@ -53,7 +53,8 @@ static				DEFINE_SPINLOCK(nsm_lock);
 /*
  * Local NSM state
  */
-int				nsm_local_state;
+int	__read_mostly		nsm_local_state;
+int	__read_mostly		nsm_use_hostnames;
 
 static inline struct sockaddr *nsm_addr(const struct nsm_handle *nsm)
 {

fs/lockd/svc.c

@@ -59,7 +59,6 @@ unsigned long			nlmsvc_timeout;
 static unsigned long		nlm_grace_period;
 static unsigned long		nlm_timeout = LOCKD_DFLT_TIMEO;
 static int			nlm_udpport, nlm_tcpport;
-int				nsm_use_hostnames = 0;
 
 /* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
 static unsigned int		nlm_max_connections = 1024;