ocfs2: don't use write_one_page in ocfs2_duplicate_clusters_by_page

Use filemap_write_and_wait_range to write back the range of the dirty
page instead of write_one_page in preparation of removing write_one_page
and eventually ->writepage.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/ocfs2/refcounttree.c

@@ -2952,10 +2952,11 @@ retry:
 		 */
 		if (PAGE_SIZE <= OCFS2_SB(sb)->s_clustersize) {
 			if (PageDirty(page)) {
-				/*
-				 * write_on_page will unlock the page on return
-				 */
-				ret = write_one_page(page);
+				unlock_page(page);
+				put_page(page);
+
+				ret = filemap_write_and_wait_range(mapping,
+						offset, map_end - 1);
 				goto retry;
 			}
 		}