extra_chunk      2839 drivers/md/raid10.c 	int extra_chunk, chunks;
extra_chunk      2855 drivers/md/raid10.c 		extra_chunk = 0;
extra_chunk      2857 drivers/md/raid10.c 		extra_chunk = 1;
extra_chunk      2858 drivers/md/raid10.c 	window_size = (chunks + extra_chunk) * conf->mddev->chunk_sectors;