92 	size_t read_head;  member
136 	return ldata->read_head - ldata->read_tail;  in read_cnt()
308 	*read_buf_addr(ldata, ldata->read_head) = c;  in put_tty_queue()
309 	ldata->read_head++;  in put_tty_queue()
325 	ldata->read_head = ldata->canon_head = ldata->read_tail = 0;  in reset_buffer_flags()
961 	if (ldata->read_head == ldata->canon_head) {  in eraser()
971 			ldata->read_head = ldata->canon_head;  in eraser()
975 			ldata->read_head = ldata->canon_head;  in eraser()
987 	while (MASK(ldata->read_head) != MASK(ldata->canon_head)) {  in eraser()
988 		head = ldata->read_head;  in eraser()
1008 		cnt = ldata->read_head - head;  in eraser()
1009 		ldata->read_head = head;  in eraser()
1028 				size_t tail = ldata->read_head;  in eraser()
1067 	if (ldata->read_head == ldata->canon_head && L_ECHO(tty))  in eraser()
1267 	set_bit(MASK(ldata->read_head), ldata->read_flags);  in n_tty_receive_handle_newline()
1269 	smp_store_release(&ldata->canon_head, ldata->read_head);  in n_tty_receive_handle_newline()
1306 		while (MASK(tail) != MASK(ldata->read_head)) {  in n_tty_receive_char_canon()
1339 			if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_canon()
1402 			if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_special()
1439 		if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char()
1534 		size_t head = MASK(ldata->read_head);  in n_tty_receive_buf_real_raw()
1539 		ldata->read_head += n;  in n_tty_receive_buf_real_raw()
1648 	smp_store_release(&ldata->commit_head, ldata->read_head);  in __receive_buf()
1715 		room = N_TTY_BUF_SIZE - (ldata->read_head - tail);  in n_tty_receive_buf_common()
1722 				ldata->read_head--;  in n_tty_receive_buf_common()
1806 			set_bit(MASK(ldata->read_head - 1), ldata->read_flags);  in n_tty_set_termios()
1807 			ldata->canon_head = ldata->read_head;  in n_tty_set_termios()
1810 		ldata->commit_head = ldata->read_head;  in n_tty_set_termios()