499 	unsigned int iter_head = i->head;  in data_start()  local
502 	if (off && (!allocated(&i->pipe->bufs[iter_head & p_mask]) ||  in data_start()
504 		iter_head++;  in data_start()
507 	*iter_headp = iter_head;  in data_start()
517 	unsigned int iter_head;  in push_pipe()  local
527 	data_start(i, &iter_head, &off);  in push_pipe()
528 	*iter_headp = iter_head;  in push_pipe()
533 			pipe->bufs[iter_head & p_mask].len += size;  in push_pipe()
536 		pipe->bufs[iter_head & p_mask].len = PAGE_SIZE;  in push_pipe()
537 		iter_head++;  in push_pipe()
539 	while (!pipe_full(iter_head, p_tail, pipe->max_usage)) {  in push_pipe()
540 		struct pipe_buffer *buf = &pipe->bufs[iter_head & p_mask];  in push_pipe()
550 		iter_head++;  in push_pipe()
551 		pipe->head = iter_head;  in push_pipe()
1275 				int iter_head,  in __pipe_get_pages()  argument
1280 	ssize_t n = push_pipe(i, maxsize, &iter_head, start);  in __pipe_get_pages()
1287 		get_page(*pages++ = pipe->bufs[iter_head & p_mask].page);  in __pipe_get_pages()
1288 		iter_head++;  in __pipe_get_pages()
1299 	unsigned int iter_head, npages;  in pipe_get_pages()  local
1308 	data_start(i, &iter_head, start);  in pipe_get_pages()
1310 	npages = pipe_space_for_user(iter_head, i->pipe->tail, i->pipe);  in pipe_get_pages()
1313 	return __pipe_get_pages(i, min(maxsize, capacity), pages, iter_head, start);  in pipe_get_pages()
1367 	unsigned int iter_head, npages;  in pipe_get_pages_alloc()  local
1376 	data_start(i, &iter_head, start);  in pipe_get_pages_alloc()
1378 	npages = pipe_space_for_user(iter_head, i->pipe->tail, i->pipe);  in pipe_get_pages_alloc()
1387 	n = __pipe_get_pages(i, maxsize, p, iter_head, start);  in pipe_get_pages_alloc()
1600 		unsigned int iter_head;  in iov_iter_npages()  local
1606 		data_start(i, &iter_head, &off);  in iov_iter_npages()
1608 		npages = pipe_space_for_user(iter_head, pipe->tail, pipe);  in iov_iter_npages()