[gpfsug-discuss] quota on secondary groups for a user?

[Jonathan Buzzard]

On 03/08/16 19:06, Buterbaugh, Kevin L wrote:
> Hi Sven,
>
> Wait - am I misunderstanding something here?  Let’s say that I have
> “user1” who has primary group “group1” and secondary group “group2”.
>  And let’s say that they write to a directory where the bit on the
> directory forces all files created in that directory to have group2
> associated with them.  Are you saying that those files still count
> against group1’s group quota???
>

Yeah, but bastard user from hell over here then does

  chgrp group1 myevilfile.txt

and your set group id bit becomes irrelevant because it is only ever 
indicative. In fact there is nothing that guarantees the set group id 
bit is honored because there is nothing stopping the user or a program 
coming in immediately after the file is created and changing that. Not 
pointing fingers at the OSX SMB client when Unix extensions are active 
on a Samba server in any way there.

As such Unix group quotas are in the real world a total waste of space. 
This is if you ask me why XFS and Lustre have project quotas and GPFS 
has file sets.

JAB.

-- 
Jonathan A. Buzzard                 Email: jonathan (at) buzzard.me.uk
Fife, United Kingdom.