92 	size_t read_head;  member
133 	return ldata->read_head - ldata->read_tail;  in read_cnt()
307 	*read_buf_addr(ldata, ldata->read_head) = c;  in put_tty_queue()
308 	ldata->read_head++;  in put_tty_queue()
324 	ldata->read_head = ldata->canon_head = ldata->read_tail = 0;  in reset_buffer_flags()
983 	if (ldata->read_head == ldata->canon_head) {  in eraser()
993 			ldata->read_head = ldata->canon_head;  in eraser()
997 			ldata->read_head = ldata->canon_head;  in eraser()
1009 	while (ldata->read_head != ldata->canon_head) {  in eraser()
1010 		head = ldata->read_head;  in eraser()
1029 		cnt = ldata->read_head - head;  in eraser()
1030 		ldata->read_head = head;  in eraser()
1049 				size_t tail = ldata->read_head;  in eraser()
1088 	if (ldata->read_head == ldata->canon_head && L_ECHO(tty))  in eraser()
1335 			while (tail != ldata->read_head) {  in n_tty_receive_char_special()
1360 				if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_special()
1373 			set_bit(ldata->read_head & (N_TTY_BUF_SIZE - 1), ldata->read_flags);  in n_tty_receive_char_special()
1375 			smp_store_release(&ldata->canon_head, ldata->read_head);  in n_tty_receive_char_special()
1388 			if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_special()
1415 		if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_inline()
1443 		if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_fast()
1515 	head = ldata->read_head & (N_TTY_BUF_SIZE - 1);  in n_tty_receive_buf_real_raw()
1518 	ldata->read_head += n;  in n_tty_receive_buf_real_raw()
1522 	head = ldata->read_head & (N_TTY_BUF_SIZE - 1);  in n_tty_receive_buf_real_raw()
1525 	ldata->read_head += n;  in n_tty_receive_buf_real_raw()
1657 	smp_store_release(&ldata->commit_head, ldata->read_head);  in __receive_buf()
1723 		room = N_TTY_BUF_SIZE - (ldata->read_head - tail);  in n_tty_receive_buf_common()
1730 				ldata->read_head--;  in n_tty_receive_buf_common()
1811 			set_bit((ldata->read_head - 1) & (N_TTY_BUF_SIZE - 1),  in n_tty_set_termios()
1813 			ldata->canon_head = ldata->read_head;  in n_tty_set_termios()
1816 		ldata->commit_head = ldata->read_head;  in n_tty_set_termios()