Hello all,
We're getting a "Operation not permitted" error while trying to create a
snapshot on the client. It is somehow related to previously-asked Pacific issue
mentioned here: https://www.spinics.net/lists/ceph-users/msg67908.html
We are on squid (19.2.1) and the given workaround seems to be only temporary.
Anyway, here are some details about the issue:
Cephx side:
```
client.mount-update-production
key: ***
caps: [mds] allow rws fsname=production-cephfs
path=/volumes/_nogroup/update-production
caps: [mon] allow r fsname=production-cephfs
caps: [osd] allow rw tag cephfs data=production-cephfs
```
FS flags:
```
~> sudo ceph fs lsflags production-cephfs
joinable allow_snaps allow_multimds_snaps
```
I got the path via following command:
```
~> sudo ceph fs subvolume getpath production-cephfs update-production
/volumes/_nogroup/update-production/e155ba30-d201-4653-be3f-86533324ee5f
```
And mounted to client with mentioned key:
```
~> mount | grep ceph
mount-update-production@00000000-0000-0000-0000-000000000000.production-cephfs=/volumes/_nogroup/update-production/e155ba30-d201-4653-be3f-86533324ee5f
on /opt/aptly/.aptly type ceph
(rw,noatime,name=mount-update-production,secret=<hidden>,acl,mon_addr=[multiple
mon addresses here])
```
Everything works flawlessly. Yet, when we want to get a snapshot:
```
/opt/aptly/.aptly/pool/9c/0b ~> sudo mkdir .snap/test
mkdir: cannot create directory ‘.snap/test’: Operation not permitted
```
If I mount the whole FS with admin rights and run `setfattr -n
ceph.dir.subvolume -v 0` for _all_ directories of following path one by one:
/volumes/_nogroup/update-production/e155ba30-d201-4653-be3f-86533324ee5f, then
it is solving the issue. But it does not last; not sure what is triggering it
again, but if I try snapshotting anything next day, getting the same "Operation
not permitted" error again.
Is there something I can try, or am I missing something obvious?
Thanks,
Gürkan
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