DRBD_A_DISK_CONF_DISK_DRAIN
if (nla_put_u8(skb, DRBD_A_DISK_CONF_DISK_DRAIN, s->disk_drain))
[DRBD_A_DISK_CONF_DISK_DRAIN] = { .type = NLA_U8, },
nla = ntb[DRBD_A_DISK_CONF_DISK_DRAIN];