1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/socket.h b/include/linux/socket.h
index c9852ef7e317..5bf59c8493b7 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -139,6 +139,11 @@ static inline struct cmsghdr * cmsg_nxthdr (struct msghdr *__msg, struct cmsghdr
         return __cmsg_nxthdr(__msg->msg_control, __msg->msg_controllen, __cmsg);
 }
 
+static inline size_t msg_data_left(struct msghdr *msg)
+{
+        return iov_iter_count(&msg->msg_iter);
+}
+
 /* "Socket"-level control message types: */
 
 #define SCM_RIGHTS      0x01            /* rw: access rights (array of int) */