sb extraction changed

kernelmode_solution/extractmd.c

@@ -116,7 +116,7 @@ static int extractmd_ioctl(struct inode *inode, struct file *f, struct extractmd
 
 	/* super block in Group 0 */
 	bh_sb = __bread(bdev, 0, EXT4_BLOCK_SIZE(sb));
-	extractmd_write_file(path_super_block, bh_sb->b_data, EXT4_BLOCK_SIZE(sb));
+	extractmd_write_file(path_super_block, bh_sb->b_data + 1024, 1024);
 	//extractmd_write_file_per_group(path_super_block, bh_sb->b_data, EXT4_BLOCK_SIZE(sb), 0);
 
 	/* sparse super block v2? */
@@ -127,37 +127,34 @@ static int extractmd_ioctl(struct inode *inode, struct file *f, struct extractmd
 
 		bh_redundant_sb1 = __bread(bdev, extractmd_group_first_block_no(sb, sbi->s_es->s_backup_bgs[0]), EXT4_BLOCK_SIZE(sb));
 		bh_redundant_sb2 = __bread(bdev, extractmd_group_first_block_no(sb, sbi->s_es->s_backup_bgs[1]), EXT4_BLOCK_SIZE(sb));
-		extractmd_append_file(path_super_block, bh_redundant_sb1->b_data, EXT4_BLOCK_SIZE(sb));
-		extractmd_append_file(path_super_block, bh_redundant_sb2->b_data, EXT4_BLOCK_SIZE(sb));
-
+		extractmd_append_file(path_super_block, bh_redundant_sb1->b_data, 1024);
+		extractmd_append_file(path_super_block, bh_redundant_sb2->b_data, 1024);
 	}
 
 	/* sparse super block?  Yes -> then sb in group 0 or a power of 3, 5, or 7 */
 	else if((sbi->s_es->s_feature_ro_compat & 0x1) == 1)
 	{
-		
 		unsigned long x,y,z;
 		struct buffer_head *bh_redundant_sb;
 
 		for (x = 1; extractmd_pow(3,x) < nr_group; x++)
 		{
 			bh_redundant_sb = __bread(bdev, extractmd_group_first_block_no(sb,extractmd_pow(3,x)), EXT4_BLOCK_SIZE(sb));
-			extractmd_append_file(path_super_block, bh_redundant_sb->b_data, EXT4_BLOCK_SIZE(sb));
+			extractmd_append_file(path_super_block, bh_redundant_sb->b_data, 1024);
 		}
 
 		for (y = 1; extractmd_pow(5,y) < nr_group; y++)
 		{
 			bh_redundant_sb = __bread(bdev, extractmd_group_first_block_no(sb,extractmd_pow(5,y)), EXT4_BLOCK_SIZE(sb));
-			extractmd_append_file(path_super_block, bh_redundant_sb->b_data, EXT4_BLOCK_SIZE(sb));
+			extractmd_append_file(path_super_block, bh_redundant_sb->b_data, 1024);
 		}
 
 
 		for (z = 1; extractmd_pow(7,z) < nr_group; z++)
 		{
 			bh_redundant_sb = __bread(bdev, extractmd_group_first_block_no(sb,extractmd_pow(7,z)), EXT4_BLOCK_SIZE(sb));
-			extractmd_append_file(path_super_block, bh_redundant_sb->b_data, EXT4_BLOCK_SIZE(sb));
+			extractmd_append_file(path_super_block, bh_redundant_sb->b_data, 1024);
 		}
-
 	}
 
 	else 
@@ -168,7 +165,7 @@ static int extractmd_ioctl(struct inode *inode, struct file *f, struct extractmd
 		for (k = 1; k < nr_group; k++)
 		{
 			bh_redundant_sb = __bread(bdev, extractmd_group_first_block_no(sb, k), EXT4_BLOCK_SIZE(sb));
-			extractmd_append_file(path_super_block, bh_redundant_sb->b_data, EXT4_BLOCK_SIZE(sb));
+			extractmd_append_file(path_super_block, bh_redundant_sb->b_data, 1024);
 		}
 
 	}