drbd: add packet_type 27 (return_code_only) to netlink api

In case we ever should add an other packet type,
we must not reuse 27, as that currently used for
"empty" return code only replies.
Document it as such.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/include/linux/drbd_nl.h b/include/linux/drbd_nl.h
index 8cde3945d1f7..6fc614b06c4d 100644
--- a/include/linux/drbd_nl.h
+++ b/include/linux/drbd_nl.h
@@ -146,9 +146,13 @@ NL_PACKET(new_c_uuid, 26,
        NL_BIT(          63,     T_MANDATORY,    clear_bm)
 )
 
+#ifdef NL_RESPONSE
+NL_RESPONSE(return_code_only, 27)
+#endif
+
 #undef NL_PACKET
 #undef NL_INTEGER
 #undef NL_INT64
 #undef NL_BIT
 #undef NL_STRING
-
+#undef NL_RESPONSE