ntfs_bitmap_clear_le
ntfs_bitmap_clear_le(bh->b_data, b0, blocksize * 8 - b0);
ntfs_bitmap_clear_le(bh->b_data, wbit, op);
ntfs_bitmap_clear_le(Add2Ptr(buffer_le, roff), off, bits);
void ntfs_bitmap_clear_le(void *map, unsigned int start, int len);