udf: Fix bug in VAT mapping code

Fix mapping of blocks using VAT when it is stored in an inode.
UDF_I(inode)->i_data already points to the beginning of VAT header so there's
no need to add udf_ext0_offset(inode).
Signed-off-by: Sebastian Manciulea <manciuleas@yahoo.com>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/udf/partition.c

@@ -66,7 +66,8 @@ uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block,
 	}
 
 	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
-		loc = le32_to_cpu(((__le32 *)iinfo->i_ext.i_data)[block]);
+		loc = le32_to_cpu(((__le32 *)(iinfo->i_ext.i_data +
+			vdata->s_start_offset))[block]);
 		goto translate;
 	}
 	index = (sb->s_blocksize - vdata->s_start_offset) / sizeof(uint32_t);

fs/udf/super.c

@@ -1215,8 +1215,7 @@ static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
 		return 1;
 
 	if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
-		map->s_type_specific.s_virtual.s_start_offset =
-			udf_ext0_offset(sbi->s_vat_inode);
+		map->s_type_specific.s_virtual.s_start_offset = 0;
 		map->s_type_specific.s_virtual.s_num_entries =
 			(sbi->s_vat_inode->i_size - 36) >> 2;
 	} else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
@@ -1233,8 +1232,7 @@ static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
 		}
 
 		map->s_type_specific.s_virtual.s_start_offset =
-			le16_to_cpu(vat20->lengthHeader) +
-			udf_ext0_offset(sbi->s_vat_inode);
+			le16_to_cpu(vat20->lengthHeader);
 		map->s_type_specific.s_virtual.s_num_entries =
 			(sbi->s_vat_inode->i_size -
 				map->s_type_specific.s_virtual.