+.LDLM_CP_CALLBACK Reply Packet Structure
+image::ldlm-cp-callback-reply.png["LDLM_CP_CALLBACK Reply Packet Structure",height=50]
+
+//////////////////////////////////////////////////////////////////////
+The ldlm-cp-callback-reply.png diagram resembles this text
+art:
+
+ LDLM_CP_CALLBACK:
+ --reply--------
+ | ptlrpc_body |
+ ---------------
+//////////////////////////////////////////////////////////////////////
+
+The reply is just an acknowledgment of receipt, and doesn't
+carry any further information about the lock or the resource.
+
+'ptlrpc_body'::
+RPC descriptor <<struct-ptlrpc-body>>.
+