[PATCH 1/2] xfs: add CRC infrastructure

[Andi Kleen]

> Why would that be necessary? We never include the checksum field in
> the calculation when setting it or verifiying it, and the
> verification uses exactly the same method as the original
> calculation to check the CRC, so it doesn't matter if the CRC value
> is zero or not - if it matches (zero or otherwise), the validation
> passes....

I thought zero meant the checksum is not there? You stated that
somewhere else.

-Andi