186 	unsigned int head = pipe->head;  in splice_to_pipe()  local
199 	while (!pipe_full(head, tail, pipe->max_usage)) {  in splice_to_pipe()
200 		struct pipe_buffer *buf = &pipe->bufs[head & mask];  in splice_to_pipe()
209 		head++;  in splice_to_pipe()
210 		pipe->head = head;  in splice_to_pipe()
231 	unsigned int head = pipe->head;  in add_to_pipe()  local
239 	} else if (pipe_full(head, tail, pipe->max_usage)) {  in add_to_pipe()
242 		pipe->bufs[head & mask] = *buf;  in add_to_pipe()
243 		pipe->head = head + 1;  in add_to_pipe()
357 	    pipe_occupancy(pipe->head, pipe->tail) > 1)  in pipe_to_sendpage()
395 	unsigned int head = pipe->head;  in splice_from_pipe_feed()  local
400 	while (!pipe_empty(head, tail)) {  in splice_from_pipe_feed()
477 	while (pipe_empty(pipe->head, pipe->tail)) {  in splice_from_pipe_next()
636 		unsigned int head, tail, mask;  in iter_file_splice_write()  local
655 		head = pipe->head;  in iter_file_splice_write()
661 		for (n = 0; !pipe_empty(head, tail) && left && n < nbufs; tail++) {  in iter_file_splice_write()
780 	p_space = pipe->max_usage - pipe_occupancy(pipe->head, pipe->tail);  in do_splice_to()
858 	WARN_ON_ONCE(!pipe_empty(pipe->head, pipe->tail));  in splice_direct_to_actor()
902 	pipe->tail = pipe->head = 0;  in splice_direct_to_actor()
988 		if (!pipe_full(pipe->head, pipe->tail, pipe->max_usage))  in wait_for_space()
1366 	if (!pipe_empty(pipe->head, pipe->tail))  in ipipe_prep()
1372 	while (pipe_empty(pipe->head, pipe->tail)) {  in ipipe_prep()
1402 	if (!pipe_full(pipe->head, pipe->tail, pipe->max_usage))  in opipe_prep()
1408 	while (pipe_full(pipe->head, pipe->tail, pipe->max_usage)) {  in opipe_prep()
1462 	o_head = opipe->head;  in splice_pipe_to_pipe()
1475 		i_head = ipipe->head;  in splice_pipe_to_pipe()
1520 			opipe->head = o_head;  in splice_pipe_to_pipe()
1545 			opipe->head = o_head;  in splice_pipe_to_pipe()
1588 	o_head = opipe->head;  in link_pipe()
1599 		i_head = ipipe->head;  in link_pipe()
1638 		opipe->head = o_head;  in link_pipe()