UID reset to root after chgrp on CephFS Ganesha export

[Wido den Hollander <wido@xxxxxxxx>]

Hi,

I have a CephFS filesystem which is re-exported through NFS Ganesha (v2.3.0) with Ceph 10.2.2

The export works fine, but when calling a chgrp on a file the UID is set to root.

Example list of commands:

$ chown www-data:www-data myfile

That works, file is now owned by www-data/www-data

$ chgrp nogroup myfile

That files, the UID is now set to 0 (root) and the group hasn't changed.

I tracked this down to being a Ganesha problem in combination with CephFS. Running these commands on either a kernel mounted CephFS or via FUSE I don't see this problem.

The Ganesha configuration:

NFSv4
{
	IdmapConf = /etc/idmapd.conf;
}

EXPORT
{
    Export_ID = 1;
    Path = "/";
    Pseudo = "/";
    Access_Type = RW;
    Protocols = "4";
    Squash = no_root_squash;
    Transports = TCP;
    SecType = sys;

    FSAL {
        Name = CEPH;
    }
}

Has anybody seen this before?

Wido
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