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diff --git a/xlators/features/upcall/src/upcall-messages.h b/xlators/features/upcall/src/upcall-messages.h
new file mode 100644
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+++ b/xlators/features/upcall/src/upcall-messages.h
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+/*
+ Copyright (c) 2015 Red Hat, Inc. <http://www.redhat.com>
+ This file is part of GlusterFS.
+
+ This file is licensed to you under your choice of the GNU Lesser
+ General Public License, version 3 or any later version (LGPLv3 or
+ later), or the GNU General Public License, version 2 (GPLv2), in all
+ cases as published by the Free Software Foundation.
+ */
+
+#ifndef _UPCALL_MESSAGES_H_
+#define _UPCALL_MESSAGES_H_
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glfs-message-id.h"
+
+/*! \file upcall-messages.h
+ *  \brief UPCALL log-message IDs and their descriptions.
+ */
+
+/* NOTE: Rules for message additions
+ * 1) Each instance of a message is _better_ left with a unique message ID, even
+ * if the message format is the same. Reasoning is that, if the message
+ * format needs to change in one instance, the other instances are not
+ * impacted or the new change does not change the ID of the instance being
+ * modified.
+ * 2) Addition of a message,
+ * - Should increment the GLFS_NUM_MESSAGES
+ * - Append to the list of messages defined, towards the end
+ * - Retain macro naming as glfs_msg_X (for redability across developers)
+ * NOTE: Rules for message format modifications
+ * 3) Check across the code if the message ID macro in question is reused
+ * anywhere. If reused then then the modifications should ensure correctness
+ * everywhere, or needs a new message ID as (1) above was not adhered to. If
+ * not used anywhere, proceed with the required modification.
+ * NOTE: Rules for message deletion
+ * 4) Check (3) and if used anywhere else, then cannot be deleted. If not used
+ * anywhere, then can be deleted, but will leave a hole by design, as
+ * addition rules specify modification to the end of the list and not filling
+ * holes.
+ */
+
+#define GLFS_COMP_BASE_UPCALL GLFS_MSGID_COMP_UPCALL
+#define GLFS_NUM_MESSAGES 1
+#define GLFS_MSGID_END (GLFS_COMP_BASE_UPCALL + GLFS_NUM_MESSAGES + 1)
+
+#define glfs_msg_start_x GLFS_COMP_BASE_UPCALL, "Invalid: Start of messages"
+
+/*!
+ * @messageid 110001
+ * @diagnosis Out of Memory
+ * @recommendedaction None
+ */
+#define UPCALL_MSG_NO_MEMORY             (GLFS_COMP_BASE_UPCALL + 1)
+
+#define glfs_msg_end_x GLFS_MSGID_END, "Invalid: End of messages"
+
+#endif /* !_UPCALL_MESSAGES_H_ */