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    Subject[PATCH 03/23] ext4: Record the checksum algorithm in use in the superblock
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    Record the type of checksum algorithm we're using for metadata in the
    superblock, in case we ever want/need to change the algorithm.

    Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
    ---
    fs/ext4/super.c | 18 ++++++++++++++++++
    1 files changed, 18 insertions(+), 0 deletions(-)


    diff --git a/fs/ext4/super.c b/fs/ext4/super.c
    index 502c61f..38de050 100644
    --- a/fs/ext4/super.c
    +++ b/fs/ext4/super.c
    @@ -111,6 +111,16 @@ static struct file_system_type ext3_fs_type = {
    #define IS_EXT3_SB(sb) (0)
    #endif

    +static int ext4_verify_csum_type(struct super_block *sb,
    + struct ext4_super_block *es)
    +{
    + if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
    + EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
    + return 1;
    +
    + return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
    +}
    +
    void *ext4_kvmalloc(size_t size, gfp_t flags)
    {
    void *ret;
    @@ -3178,6 +3188,14 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
    goto cantfind_ext4;
    sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);

    + /* Check for a known checksum algorithm */
    + if (!ext4_verify_csum_type(sb, es)) {
    + ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
    + "unknown checksum algorithm.");
    + silent = 1;
    + goto cantfind_ext4;
    + }
    +
    /* Set defaults before we parse the mount options */
    def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
    set_opt(sb, INIT_INODE_TABLE);


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