[CentOS] Unknown NFSv4 ACL permission

Tue Oct 2 22:28:18 UTC 2018
Paul Heinlein <heinlein at madboa.com>

Our new-to-us Isilon is handling NFSv4 ACLs differently than other NFS 
file servers we've had. In particular, something causes an 'O' to pop 
up in the permission field, but I cannot find any documentation of it. 
For example,

[Linux]$ nfs4_getfacl TODO
A:gO:admins at madboa.com:rwadxtTnNcy
A:gO:readonly at madboa:rxtnc

I'll note that when those 'O' perms get added, our OmniOS 
(Solaris-alike) hosts cannot read the ACLs:

[SunOS]$ ls -v TODO
ls: can't read ACL on TODO: Invalid argument
-rwxrwx---   1 heinlein wheel    2488 Oct  2 15:13 TODO

If, on the Linux side, I run nfs4_editfacl and do nothing but remove 
the 'O' permission symbols, then things clear up.

Has anyone here seen anything like this? My google-fu has failed.

Paul Heinlein
heinlein at madboa.com
45°38' N, 122°6' W