CEPH_MSG_CLIENT_CAPS
msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, cap_msg_size(arg), GFP_NOFS,
msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, cap_msg_size(&arg),
case CEPH_MSG_CLIENT_CAPS:
case CEPH_MSG_CLIENT_CAPS: return "client_caps";