diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 262efdb..d8f7d74 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -781,6 +781,31 @@
 				     int *errcode,
 				     gfp_t gfp_mask);
 
+/* Layout of fast clones : [skb1][skb2][fclone_ref] */
+struct sk_buff_fclones {
+	struct sk_buff	skb1;
+
+	struct sk_buff	skb2;
+
+	atomic_t	fclone_ref;
+};
+
+/**
+ *	skb_fclone_busy - check if fclone is busy
+ *	@skb: buffer
+ *
+ * Returns true is skb is a fast clone, and its clone is not freed.
+ */
+static inline bool skb_fclone_busy(const struct sk_buff *skb)
+{
+	const struct sk_buff_fclones *fclones;
+
+	fclones = container_of(skb, struct sk_buff_fclones, skb1);
+
+	return skb->fclone == SKB_FCLONE_ORIG &&
+	       fclones->skb2.fclone == SKB_FCLONE_CLONE;
+}
+
 static inline struct sk_buff *alloc_skb_fclone(unsigned int size,
 					       gfp_t priority)
 {