xfstests enospc tests not filling up file systems with transparent compression

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Hello,

There are various xfstests that try to fill up whole partition but
they give false positives on file systems with transparent compression
because they use compressible test files like input from /dev/zero.
Different tests use different ways to generate test file(s) so what
would be the preferred way to generate incompressible test files? Use
/dev/urandom instead /dev/zero?

Thanks

Dushan
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