Clean up the experimental NFS server replay cache when the module is unloaded.

Reviewed by:    rmacklem
Approved by:    zml (mentor)

sys/fs/nfsserver/nfs_nfsdcache.c

@@ -727,9 +727,8 @@ nfsrc_freecache(struct nfsrvcache *rp)
 	newnfsstats.srvcache_size--;
 }
 
-#ifdef notdef
 /*
- * Clean out the cache. Called when the last nfsd terminates.
+ * Clean out the cache. Called when nfsserver module is unloaded.
  */
 APPLESTATIC void
 nfsrvd_cleancache(void)
@@ -752,7 +751,6 @@ nfsrvd_cleancache(void)
 	nfsrc_tcpsavedreplies = 0;
 	NFSUNLOCKCACHE();
 }
-#endif	/* notdef */
 
 /*
  * The basic rule is to get rid of entries that are expired.

sys/fs/nfsserver/nfs_nfsdport.c

@@ -3078,6 +3078,10 @@ nfsd_modevent(module_t mod, int type, void *data)
 #endif
 		nfsd_call_servertimer = NULL;
 		nfsd_call_nfsd = NULL;
+
+		/* Clean the NFS server reply cache */
+		nfsrvd_cleancache();
+
 		/* and get rid of the locks */
 		mtx_destroy(&nfs_cache_mutex);
 		mtx_destroy(&nfs_v4root_mutex);