I find this on Wikipedia
Quote:
In August 2017, the release notes of Red Hat Enterprise Linux 7.4 indicated that Red Hat was going to stop supporting Btrfs; RHEL 7.4 includes updates for Btrfs from upstream, but there are no further updates planned to be included, and Btrfs will be removed from Red Hat Enterprise Linux in a future major release.
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which means that will also be the case in CentOS 7.4. I'm presuming it's already gone in 7.5. Certainly I'm not finding anything with yum.
Otherwise, I don't know...sorry.