224 	unsigned int writers = READ_ONCE(pipe->writers);  in pipe_readable()  local
226 	return !pipe_empty(head, tail) || !writers;  in pipe_readable()
340 		if (!pipe->writers)  in pipe_read()
681 		if (!pipe->writers && filp->f_version != pipe->w_counter)  in pipe_poll()
723 		pipe->writers--;  in pipe_release()
726 	if (!pipe->readers != !pipe->writers) {  in pipe_release()
887 	pipe->readers = pipe->writers = 1;  in get_pipe_inode()
1142 		if (!is_pipe && !pipe->writers) {  in fifo_open()
1165 		if (!pipe->writers++)  in fifo_open()
1183 		pipe->writers++;  in fifo_open()
1186 		if (pipe->readers == 1 || pipe->writers == 1)  in fifo_open()
1206 	if (!--pipe->writers)  in fifo_open()