Creating zero-filled file aborts after 20GB in a 4GB volume with compress=lzo

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Hi,

When running ...

> dd if=/dev/zero of=testfile bs=1M

on a compressed btrfs volume of 4GB mounted with compress=lzo, dd
aborts after about 20GB written.

As I don't think this can be attributed to metadata consumed ... Any
ideas why lzo achieves such a poor ratio for even highly compressible
data?

Thank you in advance, Clemens
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