BITMAP_BLOCK_SHIFT  109 include/linux/raid/bitmap.h #define CHUNK_BLOCK_RATIO(bitmap) ((bitmap)->chunksize >> BITMAP_BLOCK_SHIFT)
BITMAP_BLOCK_SHIFT  110 include/linux/raid/bitmap.h #define CHUNK_BLOCK_SHIFT(bitmap) ((bitmap)->chunkshift - BITMAP_BLOCK_SHIFT)