add_in_kvec
add_in_kvec(con, buf, CEPH_BANNER_V2_PREFIX_LEN);
add_in_kvec(con, buf, payload_len);
add_in_kvec(con, con->v2.in_buf,
add_in_kvec(con, CTRL_BODY(buf), ctrl_len);
add_in_kvec(con, CTRL_BODY(buf) + ctrl_len, CEPH_CRC_LEN);
add_in_kvec(con, buf, ctrl_len);
add_in_kvec(con, CTRL_BODY(con->v2.in_buf), ctrl_len);
add_in_kvec(con, con->v2.in_buf, CEPH_CRC_LEN);
add_in_kvec(con, buf + CEPH_PREAMBLE_INLINE_LEN, rem_len);
add_in_kvec(con, con->v2.in_buf,
add_in_kvec(con, con->v2.in_buf, CEPH_EPILOGUE_PLAIN_LEN);
add_in_kvec(con, con->v2.in_buf, CEPH_EPILOGUE_PLAIN_LEN);
add_in_kvec(con, buf, ret);
add_in_kvec(con, msg->front.iov_base, front_len(msg));
add_in_kvec(con, msg->middle->vec.iov_base, middle_len(msg));
add_in_kvec(con, con->v2.in_buf, CEPH_EPILOGUE_PLAIN_LEN);