Re: [PATCH 13/23] ext4: Add new feature to make block groupchecksums use metadata_csum algorithm

[Ted Ts'o]

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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