NCF_WHITE
whiteout = (ncp->nc_flag & NCF_WHITE);
whiteout = (ncp->nc_flag & NCF_WHITE);
whiteout = (atomic_load_char(&ncp->nc_flag) & NCF_WHITE);
atomic_store_char(&ncp->nc_flag, ncp->nc_flag | NCF_WHITE);
__predict_true((_nc_flag & (NCF_INVALID | NCF_WIP | NCF_WHITE)) == 0); \