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Subject: Re: [PATCH 6/9] btrfs: calculate end of bio offset properly
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>> Can anyone help me on how to get test coverage for the compression
>> code?
>
> I'm not surprised xfstests missed this one since it's just readahead.
> You might be able to get better coverage with
>
> export MOUNT_OPTS="-o compress-force"

  And where the data is /dev/urandom the btrfs compression will
  bail out, so xfstest cases which uses /dev/urandom won't test
  the compression code.