Cleaning up CephFS pool

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Hello all,

I noticed that removing files on CephFS doesn't reclaim free space using ceph version 0.52(commit:e48859474c4944d4ff201ddc9f5fd400e8898173)

I created 2 500GB files on CephFS (mounted with ceph-fuse) and then removed them. Now "rados df -p data" shows a 1GB usage :
--8<----------------
pool name category KB objects clones degraded unfound rd rd KB wr wr KB data - 1048580595 257696 0 0 0 0 0 628853 1629192870
--8<----------------

Is there a way to clean it up ? "rados cleanup" needs a prefix I don't know... Of course, I could "rm" every objects but what if I had other files that I don't want to remove from CephFS ?

Thanks in advance,
Denis
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