Mirror MS_KERNMOUNT in ->mnt_flags

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/mount.h b/include/linux/mount.h
index 1638961..ca726eb 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -45,6 +45,8 @@
 #define MNT_PROPAGATION_MASK	(MNT_SHARED | MNT_UNBINDABLE)
 
 
+#define MNT_INTERNAL	0x4000
+
 struct vfsmount {
 	struct list_head mnt_hash;
 	struct vfsmount *mnt_parent;	/* fs we are mounted on */