diff --git a/fs/mount.h b/fs/mount.h
index 47da816..44e5b6f 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -13,3 +13,5 @@
 {
 	return mnt != mnt->mnt_parent;
 }
+
+extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int);