f2fs: fix to remove directory inode from dirty list

If last dirty dentry page was writebacked in reclaim path, we should
remove its directory inode from global dirty list to avoid unnecessary
flush for this inode when doing checkpoint.
Signed-off-by: NChao Yu <chao2.yu@samsung.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/data.c

@@ -1182,8 +1182,10 @@ static int f2fs_write_data_page(struct page *page,
 	unlock_page(page);
 	if (need_balance_fs)
 		f2fs_balance_fs(sbi);
-	if (wbc->for_reclaim)
+	if (wbc->for_reclaim) {
 		f2fs_submit_merged_bio(sbi, DATA, WRITE);
+		remove_dirty_dir_inode(inode);
+	}
 	return 0;
 
 redirty_out: