713  *	relay_subbufs_consumed - update the buffer's sub-buffers-consumed count
718  *	Adds to the channel buffer's consumed sub-buffer count.
719  *	subbufs_consumed should be the number of sub-buffers newly consumed,
720  *	not the total consumed.
875  *	relay_file_read_consume - update the consumed count for the buffer
916 	size_t consumed;  in relay_file_read_avail()  local
920 	consumed = buf->subbufs_consumed;  in relay_file_read_avail()
923 		if (produced == consumed)  in relay_file_read_avail()
928 	if (unlikely(produced - consumed >= n_subbufs)) {  in relay_file_read_avail()
929 		consumed = produced - n_subbufs + 1;  in relay_file_read_avail()
930 		buf->subbufs_consumed = consumed;  in relay_file_read_avail()
935 	consumed = (consumed % n_subbufs) * subbuf_size + buf->bytes_consumed;  in relay_file_read_avail()
937 	if (consumed > produced)  in relay_file_read_avail()
940 	if (consumed == produced) {  in relay_file_read_avail()
990 	size_t consumed = buf->subbufs_consumed % n_subbufs;  in relay_file_read_start_pos()  local
991 	size_t read_pos = (consumed * subbuf_size + buf->bytes_consumed)  in relay_file_read_start_pos()