93 	size_t read_head;  member
134 	return ldata->read_head - ldata->read_tail;  in read_cnt()
315 	*read_buf_addr(ldata, ldata->read_head) = c;  in put_tty_queue()
316 	ldata->read_head++;  in put_tty_queue()
332 	ldata->read_head = ldata->canon_head = ldata->read_tail = 0;  in reset_buffer_flags()
984 	if (ldata->read_head == ldata->canon_head) {  in eraser()
994 			ldata->read_head = ldata->canon_head;  in eraser()
998 			ldata->read_head = ldata->canon_head;  in eraser()
1010 	while (MASK(ldata->read_head) != MASK(ldata->canon_head)) {  in eraser()
1011 		head = ldata->read_head;  in eraser()
1031 		cnt = ldata->read_head - head;  in eraser()
1032 		ldata->read_head = head;  in eraser()
1051 				size_t tail = ldata->read_head;  in eraser()
1090 	if (ldata->read_head == ldata->canon_head && L_ECHO(tty))  in eraser()
1330 			while (MASK(tail) != MASK(ldata->read_head)) {  in n_tty_receive_char_special()
1355 				if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_special()
1368 			set_bit(ldata->read_head & (N_TTY_BUF_SIZE - 1), ldata->read_flags);  in n_tty_receive_char_special()
1370 			smp_store_release(&ldata->canon_head, ldata->read_head);  in n_tty_receive_char_special()
1383 			if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_special()
1408 		if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char()
1482 	head = ldata->read_head & (N_TTY_BUF_SIZE - 1);  in n_tty_receive_buf_real_raw()
1485 	ldata->read_head += n;  in n_tty_receive_buf_real_raw()
1489 	head = ldata->read_head & (N_TTY_BUF_SIZE - 1);  in n_tty_receive_buf_real_raw()
1492 	ldata->read_head += n;  in n_tty_receive_buf_real_raw()
1588 	smp_store_release(&ldata->commit_head, ldata->read_head);  in __receive_buf()
1655 		room = N_TTY_BUF_SIZE - (ldata->read_head - tail);  in n_tty_receive_buf_common()
1662 				ldata->read_head--;  in n_tty_receive_buf_common()
1737 			set_bit((ldata->read_head - 1) & (N_TTY_BUF_SIZE - 1),  in n_tty_set_termios()
1739 			ldata->canon_head = ldata->read_head;  in n_tty_set_termios()
1742 		ldata->commit_head = ldata->read_head;  in n_tty_set_termios()