diff --git a/fs/libfs.c b/fs/libfs.c
index c3a0837..3a3a9b5 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -61,7 +61,8 @@
 
 	if (dentry->d_name.len > NAME_MAX)
 		return ERR_PTR(-ENAMETOOLONG);
-	d_set_d_op(dentry, &simple_dentry_operations);
+	if (!dentry->d_sb->s_d_op)
+		d_set_d_op(dentry, &simple_dentry_operations);
 	d_add(dentry, NULL);
 	return NULL;
 }