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    Subject[PATCH 07/22] ext4: Create bitmap checksum helper functions
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    These helper functions will be used to calculate and verify the block and inode
    bitmap checksums.

    Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
    ---
    fs/ext4/bitmap.c | 13 +++++++++++++
    1 files changed, 13 insertions(+), 0 deletions(-)


    diff --git a/fs/ext4/bitmap.c b/fs/ext4/bitmap.c
    index fa3af81..285d23a 100644
    --- a/fs/ext4/bitmap.c
    +++ b/fs/ext4/bitmap.c
    @@ -29,3 +29,16 @@ unsigned int ext4_count_free(struct buffer_head *map, unsigned int numchars)

    #endif /* EXT4FS_DEBUG */

    +static __u32 ext4_bitmap_csum(struct super_block *sb, ext4_group_t group,
    + struct buffer_head *bh, int sz)
    +{
    + __u32 csum;
    + struct ext4_sb_info *sbi = EXT4_SB(sb);
    +
    + group = cpu_to_le32(group);
    + csum = ext4_chksum(sbi, sbi->s_uuid_csum, (__u8 *)&group,
    + sizeof(group));
    + csum = ext4_chksum(sbi, csum, (__u8 *)bh->b_data, sz);
    +
    + return csum;
    +}


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