86 	size_t read_head;  member
130 	return ldata->read_head - ldata->read_tail;  in read_cnt()
297 	*read_buf_addr(ldata, ldata->read_head) = c;  in put_tty_queue()
298 	ldata->read_head++;  in put_tty_queue()
314 	ldata->read_head = ldata->canon_head = ldata->read_tail = 0;  in reset_buffer_flags()
933 	if (ldata->read_head == ldata->canon_head) {  in eraser()
943 			ldata->read_head = ldata->canon_head;  in eraser()
947 			ldata->read_head = ldata->canon_head;  in eraser()
959 	while (MASK(ldata->read_head) != MASK(ldata->canon_head)) {  in eraser()
960 		head = ldata->read_head;  in eraser()
980 		cnt = ldata->read_head - head;  in eraser()
981 		ldata->read_head = head;  in eraser()
1000 				size_t tail = ldata->read_head;  in eraser()
1039 	if (ldata->read_head == ldata->canon_head && L_ECHO(tty))  in eraser()
1238 	set_bit(MASK(ldata->read_head), ldata->read_flags);  in n_tty_receive_handle_newline()
1240 	smp_store_release(&ldata->canon_head, ldata->read_head);  in n_tty_receive_handle_newline()
1277 		while (MASK(tail) != MASK(ldata->read_head)) {  in n_tty_receive_char_canon()
1310 			if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_canon()
1373 			if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_special()
1410 		if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char()
1505 		size_t head = MASK(ldata->read_head);  in n_tty_receive_buf_real_raw()
1510 		ldata->read_head += n;  in n_tty_receive_buf_real_raw()
1629 	smp_store_release(&ldata->commit_head, ldata->read_head);  in __receive_buf()
1696 		room = N_TTY_BUF_SIZE - (ldata->read_head - tail);  in n_tty_receive_buf_common()
1703 				ldata->read_head--;  in n_tty_receive_buf_common()
1785 			set_bit(MASK(ldata->read_head - 1), ldata->read_flags);  in n_tty_set_termios()
1786 			ldata->canon_head = ldata->read_head;  in n_tty_set_termios()
1789 		ldata->commit_head = ldata->read_head;  in n_tty_set_termios()