md/bitmap: remove some unused noise from bitmap.h

#define BITMAP_MAJOR_HI 4

#define	BITMAP_MAJOR_HOSTENDIAN 3

#define BITMAP_MINOR 39

/*

 * in-memory bitmap:

 *

/* same, except a mask value for more efficient bitops */

#define PAGE_COUNTER_MASK  (PAGE_COUNTER_RATIO - 1)

#define BITMAP_BLOCK_SIZE 512

#define BITMAP_BLOCK_SHIFT 9

/* how many blocks per chunk? (this is variable) */

#define CHUNK_BLOCK_RATIO(bitmap) ((bitmap)->mddev->bitmap_info.chunksize >> BITMAP_BLOCK_SHIFT)

#define CHUNK_BLOCK_SHIFT(bitmap) ((bitmap)->chunkshift - BITMAP_BLOCK_SHIFT)

#define CHUNK_BLOCK_MASK(bitmap) (CHUNK_BLOCK_RATIO(bitmap) - 1)

/* when hijacked, the counters and bits represent even larger "chunks" */

/* there will be 1024 chunks represented by each counter in the page pointers */

#define PAGEPTR_BLOCK_RATIO(bitmap) \

			(CHUNK_BLOCK_RATIO(bitmap) << PAGE_COUNTER_SHIFT >> 1)

#define PAGEPTR_BLOCK_SHIFT(bitmap) \

			(CHUNK_BLOCK_SHIFT(bitmap) + PAGE_COUNTER_SHIFT - 1)

#define PAGEPTR_BLOCK_MASK(bitmap) (PAGEPTR_BLOCK_RATIO(bitmap) - 1)

#endif

	unsigned int  count:31;

};

/* keep track of bitmap file pages that have pending writes on them */

struct page_list {

	struct list_head list;

	struct page *page;

};

/* the main bitmap structure - one per mddev */

struct bitmap {

	struct bitmap_page *bp;