Path to a cephfs subvolume

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Hello,

I have a question about cephfs subvolume paths. The path to a subvol seems
to be in the format of <subvol group>/<subvol>/<some UUID>, e.g.:

/volumes/csi/csi-vol-59c3cb5a-a9ee-11ec-b412-0242ac110004/b2b5a0b3-e02b-4f93-a3f5-fdcef80ebbea

I'm wondering about the <some UUID> segment. Where is it coming from, why
is there this indirection? I suppose this means there can be multiple of
these UUIDs? Nowhere in "ceph fs subvolume{,group}" can I find anything to
list them (without actually traversing <subvol group>/<subvol>/*) however.

Or can you give me hints where to look for this in the code?

Thank you!

Cheers,
Robert
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