From mboxrd@z Thu Jan  1 00:00:00 1970
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [RFC] vfs generic subtree support
Date: Tue, 16 Feb 2010 14:21:54 +0000
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To: Dmitry Monakhov <dmonakhov@openvz.org>
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On Tue, Feb 16, 2010 at 05:01:36PM +0300, Dmitry Monakhov wrote:

> Let's call it "metagroup" id. If you know better (more descriptive) word
> for this purpose i please make your suggestion.
> 
> - Such metagroup may be assigned to inode. And this id is stored on
>   inode.
> - It may be inherent from parent, if corresponding flag is set 
>   on parent dir.
> - metagroup id may be used by generic quota.

I would probably like to see example with fewer "may" and more details ;-)
Seriously, what kind of rules and uses for it do you have in mind?  More
specific example would be nice...