diff --git a/fs/pnode.h b/fs/pnode.h
index 973c3f8..958665d 100644
--- a/fs/pnode.h
+++ b/fs/pnode.h
@@ -36,4 +36,5 @@
 int propagate_umount(struct list_head *);
 int propagate_mount_busy(struct vfsmount *, int);
 void mnt_release_group_id(struct vfsmount *);
+int get_dominating_id(struct vfsmount *mnt, const struct path *root);
 #endif /* _LINUX_PNODE_H */