You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: admission.go
    path of file: ./repos/kubernetes/plugin/pkg/admission/storage/storageobjectinuseprotection
    
    the code of the file until where you have to start completion: /*
Copyright 2017 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use 
    
func (c *storageProtectionPlugin) admitPVC(a admission.Attributes) error {
	if len(a.GetSubresource()) != 0 {
		return nil
	}

	pvc, ok := a.GetObject().(*api.PersistentVolumeClaim)
	// if we can't convert the obj to PVC, just return
	if !ok {
		return nil
	}

	for _, f := range pvc.Finalizers {
		if f == volumeutil.PVCProtectionFinalizer {
			// Finalizer is already present, nothing to do
			return nil
		}
	}

	klog.V(4).Infof("adding PVC protection finalizer to %s/%s", pvc.Namespace, pvc.Name)
	pvc.Finalizers = append(pvc.Finalizers, volumeutil.PVCProtectionFinalizer)
	return nil
}