475 			 size_t subbuf_size,  in relay_open()  argument
484 	if (!(subbuf_size && n_subbufs))  in relay_open()
486 	if (subbuf_size > UINT_MAX / n_subbufs)  in relay_open()
503 	chan->subbuf_size = subbuf_size;  in relay_open()
504 	chan->alloc_size = PAGE_ALIGN(subbuf_size * n_subbufs);  in relay_open()
663 	if (unlikely(length > buf->chan->subbuf_size))  in relay_switch_subbuf()
666 	if (buf->offset != buf->chan->subbuf_size + 1) {  in relay_switch_subbuf()
667 		buf->prev_padding = buf->chan->subbuf_size - buf->offset;  in relay_switch_subbuf()
673 				buf->chan->subbuf_size -  in relay_switch_subbuf()
676 			buf->early_bytes += buf->chan->subbuf_size -  in relay_switch_subbuf()
692 	new = buf->start + new_subbuf * buf->chan->subbuf_size;  in relay_switch_subbuf()
695 		buf->offset = buf->chan->subbuf_size + 1;  in relay_switch_subbuf()
701 	if (unlikely(length + buf->offset > buf->chan->subbuf_size))  in relay_switch_subbuf()
770 		       chan->last_toobig, chan->subbuf_size);  in relay_close()
881 	size_t subbuf_size = buf->chan->subbuf_size;  in relay_file_read_consume()  local
889 	if (buf->bytes_consumed + bytes_consumed > subbuf_size) {  in relay_file_read_consume()
898 		read_subbuf = read_pos / buf->chan->subbuf_size;  in relay_file_read_consume()
899 	if (buf->bytes_consumed + buf->padding[read_subbuf] == subbuf_size) {  in relay_file_read_consume()
901 		    (buf->offset == subbuf_size))  in relay_file_read_consume()
913 	size_t subbuf_size = buf->chan->subbuf_size;  in relay_file_read_avail()  local
922 	if (unlikely(buf->offset > subbuf_size)) {  in relay_file_read_avail()
934 	produced = (produced % n_subbufs) * subbuf_size + buf->offset;  in relay_file_read_avail()
935 	consumed = (consumed % n_subbufs) * subbuf_size + buf->bytes_consumed;  in relay_file_read_avail()
938 		produced += n_subbufs * subbuf_size;  in relay_file_read_avail()
941 		if (buf->offset == subbuf_size &&  in relay_file_read_avail()
960 	size_t subbuf_size = buf->chan->subbuf_size;  in relay_file_read_subbuf_avail()  local
962 	write_subbuf = (buf->data - buf->start) / subbuf_size;  in relay_file_read_subbuf_avail()
963 	write_offset = buf->offset > subbuf_size ? subbuf_size : buf->offset;  in relay_file_read_subbuf_avail()
964 	read_subbuf = read_pos / subbuf_size;  in relay_file_read_subbuf_avail()
965 	read_offset = read_pos % subbuf_size;  in relay_file_read_subbuf_avail()
972 		avail = (subbuf_size - padding) - read_offset;  in relay_file_read_subbuf_avail()
988 	size_t subbuf_size = buf->chan->subbuf_size;  in relay_file_read_start_pos()  local
991 	size_t read_pos = (consumed * subbuf_size + buf->bytes_consumed)  in relay_file_read_start_pos()
992 			% (n_subbufs * subbuf_size);  in relay_file_read_start_pos()
994 	read_subbuf = read_pos / subbuf_size;  in relay_file_read_start_pos()
996 	padding_start = (read_subbuf + 1) * subbuf_size - padding;  in relay_file_read_start_pos()
997 	padding_end = (read_subbuf + 1) * subbuf_size;  in relay_file_read_start_pos()
1000 		read_pos = read_subbuf * subbuf_size;  in relay_file_read_start_pos()
1017 	size_t subbuf_size = buf->chan->subbuf_size;  in relay_file_read_end_pos()  local
1020 	read_subbuf = read_pos / subbuf_size;  in relay_file_read_end_pos()
1022 	if (read_pos % subbuf_size + count + padding == subbuf_size)  in relay_file_read_end_pos()
1023 		end_pos = (read_subbuf + 1) * subbuf_size;  in relay_file_read_end_pos()
1026 	if (end_pos >= subbuf_size * n_subbufs)  in relay_file_read_end_pos()