Quotas with Mimic (CephFS-FUSE) clients in a Luminous Cluster

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Dear Cephalopodians,

in the process of migrating a cluster from Luminous (12.2.12) to Mimic (13.2.5), we have upgraded the FUSE clients first (we took the chance during a time of low activity),
thinking that this should not cause any issues. All MDS+MON+OSDs are still on Luminous, 12.2.12.

However, it seems quotas have stopped working - with a (FUSE) Mimic client (13.2.5), I see:
$ getfattr --absolute-names --only-values -n ceph.quota.max_bytes /cephfs/user/freyermu/
/cephfs/user/freyermu/: ceph.quota.max_bytes: No such attribute

A Luminous client (12.2.12) on the same cluster sees:
$ getfattr --absolute-names --only-values -n ceph.quota.max_bytes /cephfs/user/freyermu/
5000000000000

It does not seem as if the attribute has been renamed (e.g. https://github.com/ceph/ceph/blob/mimic/qa/tasks/cephfs/test_quota.py still references it, same for the docs),
and I have to assume the clients also do not enforce quota if they do not see it.

Is this a known incompatibility between Mimic clients and a Luminous cluster?
The release notes of Mimic only mention that quota support was added to the kernel client, but nothing else quota related catches my eye.

Cheers,
	Oliver

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