nfsd: per-net NFSd up flag introduced

This patch introduces introduces per-net "nfsd_net_up" boolean flag, which has
the same purpose as general "nfsd_up" flag - skip init or shutdown of per-net
resources in case of they are inited on shutted down respectively.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index fac4123c..543ac48 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -92,6 +92,8 @@
 
 	time_t nfsd4_lease;
 	time_t nfsd4_grace;
+
+	bool nfsd_net_up;
 };
 
 /* Simple check to find out if a given net was properly initialized */