diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 23a6375..8b982fc 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -282,6 +282,7 @@ static int ext4_valid_block_bitmap(struct super_block *sb,
 	ext4_grpblk_t next_zero_bit;
 	ext4_fsblk_t bitmap_blk;
 	ext4_fsblk_t group_first_block;
+	struct ext4_sb_info *sbi = EXT4_SB(sb);
 
 	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) {
 		/* with FLEX_BG, the inode/block bitmaps and itable
@@ -297,14 +298,14 @@ static int ext4_valid_block_bitmap(struct super_block *sb,
 	/* check whether block bitmap block number is set */
 	bitmap_blk = ext4_block_bitmap(sb, desc);
 	offset = bitmap_blk - group_first_block;
-	if (!ext4_test_bit(offset, bh->b_data))
+	if (!ext4_test_bit(EXT4_B2C(sbi, offset), bh->b_data))
 		/* bad block bitmap */
 		goto err_out;
 
 	/* check whether the inode bitmap block number is set */
 	bitmap_blk = ext4_inode_bitmap(sb, desc);
 	offset = bitmap_blk - group_first_block;
-	if (!ext4_test_bit(offset, bh->b_data))
+	if (!ext4_test_bit(EXT4_B2C(sbi, offset), bh->b_data))
 		/* bad block bitmap */
 		goto err_out;
 
@@ -312,9 +313,11 @@ static int ext4_valid_block_bitmap(struct super_block *sb,
 	bitmap_blk = ext4_inode_table(sb, desc);
 	offset = bitmap_blk - group_first_block;
 	next_zero_bit = ext4_find_next_zero_bit(bh->b_data,
-				offset + EXT4_SB(sb)->s_itb_per_group,
-				offset);
-	if (next_zero_bit >= offset + EXT4_SB(sb)->s_itb_per_group)
+			EXT4_B2C(sbi, offset + EXT4_SB(sb)->s_itb_per_group),
+			EXT4_B2C(sbi, offset));
+
+	if (next_zero_bit >=
+			EXT4_B2C(sbi, offset + EXT4_SB(sb)->s_itb_per_group))
 		/* good bitmap for inode tables */
 		return 1;