NTFS: Use MAX_BUF_PER_PAGE instead of variable sized array allocation for

	- Update attribute definition handling.

	- Add NTFS_MAX_CLUSTER_SIZE and NTFS_MAX_PAGES_PER_CLUSTER constants.

	- Use NTFS_MAX_CLUSTER_SIZE in super.c instead of hard coding 0x10000.

	- Use MAX_BUF_PER_PAGE instead of variable sized array allocation for

	  better code generation and one less sparse warning in fs/ntfs/aops.c.

2.1.22 - Many bug and race fixes and error handling improvements.

	ntfs_inode *ni = NTFS_I(vi);

	ntfs_volume *vol = ni->vol;

	u8 *kaddr;

	unsigned char bh_size_bits = vi->i_blkbits;

	unsigned int bh_size = 1 << bh_size_bits;

	unsigned int rec_size = ni->itype.index.block_size;

	ntfs_inode *locked_nis[PAGE_CACHE_SIZE / rec_size];

	struct buffer_head *bh, *head, *tbh, *rec_start_bh;

	int max_bhs = PAGE_CACHE_SIZE / bh_size;

	struct buffer_head *bhs[max_bhs];

	struct buffer_head *bhs[MAX_BUF_PER_PAGE];

	runlist_element *rl;

	int i, nr_locked_nis, nr_recs, nr_bhs, bhs_per_rec, err, err2;

	unsigned rec_size_bits;

	int i, nr_locked_nis, nr_recs, nr_bhs, max_bhs, bhs_per_rec, err, err2;

	unsigned bh_size, rec_size_bits;

	BOOL sync, is_mft, page_is_dirty, rec_is_dirty;

	unsigned char bh_size_bits;

	ntfs_debug("Entering for inode 0x%lx, attribute type 0x%x, page index "

			"0x%lx.", vi->i_ino, ni->type, page->index);

	 */

	BUG_ON(!(is_mft || S_ISDIR(vi->i_mode) ||

			(NInoAttr(ni) && ni->type == AT_INDEX_ALLOCATION)));

	bh_size_bits = vi->i_blkbits;

	bh_size = 1 << bh_size_bits;

	max_bhs = PAGE_CACHE_SIZE / bh_size;

	BUG_ON(!max_bhs);

	BUG_ON(max_bhs > MAX_BUF_PER_PAGE);

	/* Were we called for sync purposes? */

	sync = (wbc->sync_mode == WB_SYNC_ALL);