udf: Fix free space reporting for metadata and virtual partitions

static unsigned int udf_count_free(struct super_block *sb)

{

	unsigned int accum = 0;

	struct udf_sb_info *sbi;

	struct udf_sb_info *sbi = UDF_SB(sb);

	struct udf_part_map *map;

	unsigned int part = sbi->s_partition;

	int ptype = sbi->s_partmaps[part].s_partition_type;

	if (ptype == UDF_METADATA_MAP25) {

		part = sbi->s_partmaps[part].s_type_specific.s_metadata.

							s_phys_partition_ref;

	} else if (ptype == UDF_VIRTUAL_MAP15 || ptype == UDF_VIRTUAL_MAP20) {

		/*

		 * Filesystems with VAT are append-only and we cannot write to

 		 * them. Let's just report 0 here.

		 */

		return 0;

	}

	sbi = UDF_SB(sb);

	if (sbi->s_lvid_bh) {

		struct logicalVolIntegrityDesc *lvid =

			(struct logicalVolIntegrityDesc *)

			sbi->s_lvid_bh->b_data;

		if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {

		if (le32_to_cpu(lvid->numOfPartitions) > part) {

			accum = le32_to_cpu(

					lvid->freeSpaceTable[sbi->s_partition]);

					lvid->freeSpaceTable[part]);

			if (accum == 0xFFFFFFFF)

				accum = 0;

		}

	if (accum)

		return accum;

	map = &sbi->s_partmaps[sbi->s_partition];

	map = &sbi->s_partmaps[part];

	if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {

		accum += udf_count_free_bitmap(sb,

					       map->s_uspace.s_bitmap);