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.
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