ceph fs virtual attribute reporting bluestore allocation

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Hi all,

testing octopus 15.2.16 and found an interesting difference to mimic. The file system usage reported by df seems now to show the proper bluestore allocation as opposed to cumulative file sizes. That is great. I assume there is a ceph virtual extended attribute collecting this information. Unfortunately, I cannot figure out what it is.

Can anyone help me out? What I'm looking for is this:

# df -h
Filesystem                             Size  Used Avail Use% Mounted on
10.41.24.13,10.41.24.14,10.41.24.15:/  2.2T  170G  2.1T   8% /mnt/cephfs

OK, 170G storage allocated.

# getfattr -n ceph.dir.rbytes /mnt/cephfs
getfattr: Removing leading '/' from absolute path names
# file: mnt/cephfs
ceph.dir.rbytes="38871650661"

Only 38G file data. So, how do I get the 170G reported that are allocated as df shows?

A pointer to the relevant code section would help in case code is the only documentation.

Thanks and best regards,
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
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