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    SubjectRe: [PATCH 13/23] ext4: Add new feature to make block group checksums use metadata_csum algorithm
    On Mon, Feb 13, 2012 at 02:40:26PM -0700, Andreas Dilger wrote:
    > If a kernel understands METADATA_CSUM, it will check this first and
    > ignore whether GDT_CSUM is set or not (though it shouldn't ever be
    > set at the same time). Either of these features will cause an older
    > kernel to mount the filesystem read-only, which is all that is needed.

    ... note that when we check for the uninit bits, this will have to be
    done if GDT_CSUM || METADATA_CSUM are set.

    - Ted

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