488 	unsigned int iter_head = i->head;  in data_start()  local
491 	if (off && (!allocated(&i->pipe->bufs[iter_head & p_mask]) ||  in data_start()
493 		iter_head++;  in data_start()
496 	*iter_headp = iter_head;  in data_start()
506 	unsigned int iter_head;  in push_pipe()  local
516 	data_start(i, &iter_head, &off);  in push_pipe()
517 	*iter_headp = iter_head;  in push_pipe()
522 			pipe->bufs[iter_head & p_mask].len += size;  in push_pipe()
525 		pipe->bufs[iter_head & p_mask].len = PAGE_SIZE;  in push_pipe()
526 		iter_head++;  in push_pipe()
528 	while (!pipe_full(iter_head, p_tail, pipe->max_usage)) {  in push_pipe()
529 		struct pipe_buffer *buf = &pipe->bufs[iter_head & p_mask];  in push_pipe()
539 		iter_head++;  in push_pipe()
540 		pipe->head = iter_head;  in push_pipe()
1319 				int iter_head,  in __pipe_get_pages()  argument
1324 	ssize_t n = push_pipe(i, maxsize, &iter_head, start);  in __pipe_get_pages()
1331 		get_page(*pages++ = pipe->bufs[iter_head & p_mask].page);  in __pipe_get_pages()
1332 		iter_head++;  in __pipe_get_pages()
1343 	unsigned int iter_head, npages;  in pipe_get_pages()  local
1349 	data_start(i, &iter_head, start);  in pipe_get_pages()
1351 	npages = pipe_space_for_user(iter_head, i->pipe->tail, i->pipe);  in pipe_get_pages()
1354 	return __pipe_get_pages(i, min(maxsize, capacity), pages, iter_head, start);  in pipe_get_pages()
1522 	unsigned int iter_head, npages;  in pipe_get_pages_alloc()  local
1528 	data_start(i, &iter_head, start);  in pipe_get_pages_alloc()
1530 	npages = pipe_space_for_user(iter_head, i->pipe->tail, i->pipe);  in pipe_get_pages_alloc()
1539 	n = __pipe_get_pages(i, maxsize, p, iter_head, start);  in pipe_get_pages_alloc()
1759 		unsigned int iter_head;  in iov_iter_npages()  local
1766 		data_start(i, &iter_head, &off);  in iov_iter_npages()
1768 		npages = pipe_space_for_user(iter_head, i->pipe->tail, i->pipe);  in iov_iter_npages()