92 	size_t read_head;  member
133 	return ldata->read_head - ldata->read_tail;  in read_cnt()
314 	*read_buf_addr(ldata, ldata->read_head) = c;  in put_tty_queue()
315 	ldata->read_head++;  in put_tty_queue()
331 	ldata->read_head = ldata->canon_head = ldata->read_tail = 0;  in reset_buffer_flags()
982 	if (ldata->read_head == ldata->canon_head) {  in eraser()
992 			ldata->read_head = ldata->canon_head;  in eraser()
996 			ldata->read_head = ldata->canon_head;  in eraser()
1008 	while (MASK(ldata->read_head) != MASK(ldata->canon_head)) {  in eraser()
1009 		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()
1333 			while (MASK(tail) != MASK(ldata->read_head)) {  in n_tty_receive_char_special()
1358 				if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_special()
1371 			set_bit(ldata->read_head & (N_TTY_BUF_SIZE - 1), ldata->read_flags);  in n_tty_receive_char_special()
1373 			smp_store_release(&ldata->canon_head, ldata->read_head);  in n_tty_receive_char_special()
1386 			if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_special()
1413 		if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_inline()
1441 		if (ldata->canon_head == ldata->read_head)  in n_tty_receive_char_fast()
1512 	head = ldata->read_head & (N_TTY_BUF_SIZE - 1);  in n_tty_receive_buf_real_raw()
1515 	ldata->read_head += n;  in n_tty_receive_buf_real_raw()
1519 	head = ldata->read_head & (N_TTY_BUF_SIZE - 1);  in n_tty_receive_buf_real_raw()
1522 	ldata->read_head += n;  in n_tty_receive_buf_real_raw()
1652 	smp_store_release(&ldata->commit_head, ldata->read_head);  in __receive_buf()
1718 		room = N_TTY_BUF_SIZE - (ldata->read_head - tail);  in n_tty_receive_buf_common()
1725 				ldata->read_head--;  in n_tty_receive_buf_common()
1800 			set_bit((ldata->read_head - 1) & (N_TTY_BUF_SIZE - 1),  in n_tty_set_termios()
1802 			ldata->canon_head = ldata->read_head;  in n_tty_set_termios()
1805 		ldata->commit_head = ldata->read_head;  in n_tty_set_termios()