nfsd: make NFSd service boot time per-net

This is simple: an NFSd service can be started at different times in
different network environments. So, its "boot time" has to be assigned
per net.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 6e17efd..40992cd 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -27,7 +27,6 @@
 
 extern struct svc_program	nfsd_program;
 static int			nfsd(void *vrqstp);
-struct timeval			nfssvc_boot;
 
 /*
  * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members
@@ -367,6 +366,7 @@
 int nfsd_create_serv(struct net *net)
 {
 	int error;
+	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
 	WARN_ON(!mutex_is_locked(&nfsd_mutex));
 	if (nfsd_serv) {
@@ -388,7 +388,7 @@
 	}
 
 	set_max_drc();
-	do_gettimeofday(&nfssvc_boot);		/* record boot time */
+	do_gettimeofday(&nn->nfssvc_boot);		/* record boot time */
 	return 0;
 }