1 files changed, 10 insertions, 0 deletions

diff --git a/fs/nfs/nfs4session.h b/fs/nfs/nfs4session.h
index 86a066926f24..e3e6ce357f69 100644
--- a/fs/nfs/nfs4session.h
+++ b/fs/nfs/nfs4session.h
@@ -117,6 +117,16 @@ static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
         return 0;
 }
 
+#ifdef CONFIG_CRC32
+/*
+ * nfs_session_id_hash - calculate the crc32 hash for the session id
+ * @session - pointer to session
+ */
+#define nfs_session_id_hash(sess_id) \
+        (~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data)))
+#else
+#define nfs_session_id_hash(session) (0)
+#endif
 #else /* defined(CONFIG_NFS_V4_1) */
 
 static inline int nfs4_init_session(struct nfs_client *clp)