Bug #58048
open«EPERM: error calling ceph_mount» when trying to use subvolume commands
0%
Description
When trying to issue commands such as «ceph fs subvolume ls cephfsv2», we get a return of «Error EPERM: error calling ceph_mount» followed by the MDS logging:
2022-11-18T09:17:37.876-0500 7fca6fc3f700 1 mds.sg1vosrv44-2 parse_caps: cannot decode auth caps buffer of length 0 2022-11-18T09:17:37.876-0500 7fca6d43a700 1 mds.sg1vosrv44-2 parse_caps: cannot decode auth caps buffer of length 0 2022-11-18T09:17:37.876-0500 7fca6d43a700 0 mds.0.server dropping message not allowed for this fs_name: client_session(request_open) v5
The issue appears to be the same on all MDS and all CephFS volumes including the default one.
ceph auth list shows the right permissions for the MDS:
cephfsv2 - 0 clients
========
RANK STATE MDS ACTIVITY DNS INOS DIRS CAPS
0 active sg1vosrv44-2 Reqs: 0 /s 12 13 12 0
POOL TYPE USED AVAIL
cephfs.cephfsv2.meta metadata 31.7M 4119G
cephfs.cephfsv2.data data 0 4119G
[mds.sg1vosrv44-2]
key = AQC1YXZjPNDzIBAA85gIpirKeEgAWw1iMzi2Ow==
caps mds = "allow *"
caps mgr = "allow profile mds"
caps mon = "allow profile mds"
caps osd = "allow rwx pool=cephfs.cephfsv2.meta, allow rwx pool=cephfs.cephfsv2.data"
---
Filesystem 'cephfsv2' (4) fs_name cephfsv2 epoch 13077 flags 12 created 2022-11-17T11:47:13.955551-0500 modified 2022-11-17T17:57:01.479376-0500 tableserver 0 root 0 session_timeout 60 session_autoclose 300 max_file_size 1099511627776 required_client_features {} last_failure 0 last_failure_osd_epoch 215989 compat compat={},rocompat={},incompat={1=base v0.20,2=client writeable ranges,3=default file layouts on dirs,4=dir inode in separate object,5=mds uses versioned encoding,6=dirfrag is stored in omap,7=mds uses inline data,8=no anchor table,9=file layout v2,10=snaprealm v2} max_mds 1 in 0 up {0=122409863} failed damaged stopped data_pools [57] metadata_pool 56 inline_data disabled balancer standby_count_wanted 1 [mds.sg1vosrv44-2{0:122409863} state up:active seq 5 join_fscid=4 addr [v2:10.10.0.40:6834/3783754805,v1:10.10.0.40:6835/3783754805] compat {c=[1],r=[1],i=[7ff]}]
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