Creating FEC data on the same device

[Riz <mdrizwan827@xxxxxxxxx>]

Hi,
I am able to create the hash data for my rootfs in the same device by specifying the --hash-offset.

For example,
             veritysetup format myDevice myDevice --hash-offset=sizeOfmyDevice

This works fine and the hash data is appended at the end of rootfs.

Similarly, can we create hash data and fec data on the same device ?

As in, can we somehow do..

             veritysetup format myDevice myDevice --hash-offset=sizeOfMyDevice --fec-device=myDevice --fec-roots=2 --fec-offset=sizeOfmyDevice+sizeOfhashData

I should be able to get a single image like, |rootfs|Hashdata|fecData|

In this case, How can we determine  the value for sizeOfmyDevice+sizeOfhashData ?

Is it possible to do it ? or 

it has to be a separate file or separate partition for fec data ?

Thanks,
Rizwan

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