ocfs2: Use filemap_write_and_wait_range() in ocfs2_cow_sync_writeback()

			     struct inode *inode,

			     u32 cpos, u32 num_clusters)

{

	int ret = 0;

	loff_t offset, end, map_end;

	pgoff_t page_index;

	struct page *page;

	int ret;

	loff_t start, end;

	if (ocfs2_should_order_data(inode))

		return 0;

	offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;

	end = offset + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits);

	ret = filemap_fdatawrite_range(inode->i_mapping,

				       offset, end - 1);

	if (ret < 0) {

		mlog_errno(ret);

		return ret;

	}

	while (offset < end) {

		page_index = offset >> PAGE_SHIFT;

		map_end = ((loff_t)page_index + 1) << PAGE_SHIFT;

		if (map_end > end)

			map_end = end;

		page = find_or_create_page(inode->i_mapping,

					   page_index, GFP_NOFS);

		BUG_ON(!page);

	start = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;

	end = start + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits) - 1;

		wait_on_page_writeback(page);

		if (PageError(page)) {

			ret = -EIO;

	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);

	if (ret < 0)

		mlog_errno(ret);

		} else

			mark_page_accessed(page);

		unlock_page(page);

		put_page(page);

		page = NULL;

		offset = map_end;

		if (ret)

			break;

	}

	return ret;

}