187 	unsigned int head = pipe->head;  in splice_to_pipe()  local
200 	while (!pipe_full(head, tail, pipe->max_usage)) {  in splice_to_pipe()
201 		struct pipe_buffer *buf = &pipe->bufs[head & mask];  in splice_to_pipe()
210 		head++;  in splice_to_pipe()
211 		pipe->head = head;  in splice_to_pipe()
232 	unsigned int head = pipe->head;  in add_to_pipe()  local
240 	} else if (pipe_full(head, tail, pipe->max_usage)) {  in add_to_pipe()
243 		pipe->bufs[head & mask] = *buf;  in add_to_pipe()
244 		pipe->head = head + 1;  in add_to_pipe()
308 	i_head = to.head;  in generic_file_splice_read()
316 		to.head = i_head;  in generic_file_splice_read()
361 	    pipe_occupancy(pipe->head, pipe->tail) > 1)  in pipe_to_sendpage()
399 	unsigned int head = pipe->head;  in splice_from_pipe_feed()  local
404 	while (!pipe_empty(head, tail)) {  in splice_from_pipe_feed()
481 	while (pipe_empty(pipe->head, pipe->tail)) {  in splice_from_pipe_next()
640 		unsigned int head, tail, mask;  in iter_file_splice_write()  local
659 		head = pipe->head;  in iter_file_splice_write()
665 		for (n = 0; !pipe_empty(head, tail) && left && n < nbufs; tail++, n++) {  in iter_file_splice_write()
856 	WARN_ON_ONCE(!pipe_empty(pipe->head, pipe->tail));  in splice_direct_to_actor()
865 			pipe_occupancy(pipe->head, pipe->tail);  in splice_direct_to_actor()
905 	pipe->tail = pipe->head = 0;  in splice_direct_to_actor()
991 		if (!pipe_full(pipe->head, pipe->tail, pipe->max_usage))  in wait_for_space()
1090 			p_space = opipe->max_usage - pipe_occupancy(opipe->head, opipe->tail);  in do_splice()
1364 	if (!pipe_empty(pipe->head, pipe->tail))  in ipipe_prep()
1370 	while (pipe_empty(pipe->head, pipe->tail)) {  in ipipe_prep()
1400 	if (!pipe_full(pipe->head, pipe->tail, pipe->max_usage))  in opipe_prep()
1406 	while (pipe_full(pipe->head, pipe->tail, pipe->max_usage)) {  in opipe_prep()
1460 	o_head = opipe->head;  in splice_pipe_to_pipe()
1473 		i_head = ipipe->head;  in splice_pipe_to_pipe()
1518 			opipe->head = o_head;  in splice_pipe_to_pipe()
1543 			opipe->head = o_head;  in splice_pipe_to_pipe()
1586 	o_head = opipe->head;  in link_pipe()
1597 		i_head = ipipe->head;  in link_pipe()
1636 		opipe->head = o_head;  in link_pipe()