static int udf_sync_fs(struct super_block *sb, int wait)
{
	struct udf_sb_info *sbi = UDF_SB(sb);

	mutex_lock(&sbi->s_alloc_mutex);
	if (sbi->s_lvid_dirty) {
		/*
		 * Blockdevice will be synced later so we don't have to submit
		 * the buffer for IO
		 */
		mark_buffer_dirty(sbi->s_lvid_bh);
		sbi->s_lvid_dirty = 0;
	}
	mutex_unlock(&sbi->s_alloc_mutex);

	return 0;
}
static int udf_sync_fs(struct super_block *sb, int wait)
{
	struct udf_sb_info *sbi = UDF_SB(sb);

	mutex_lock(&sbi->s_alloc_mutex);
	if (sbi->s_lvid_dirty) {
		 
		mark_buffer_dirty(sbi->s_lvid_bh);
		sbi->s_lvid_dirty = 0;
	}
	mutex_unlock(&sbi->s_alloc_mutex);

	return 0;
}