From: Glauber Costa <glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
Subject: Re: [PATCH 10/12] container quota: bill container inodes alloc/free
 on ext4.
Date: Thu, 31 May 2012 17:14:50 +0400
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On 05/31/2012 04:58 PM, Jeff Liu wrote:
>> >  This should be inside dquot_free_inode().
> Yeah, Ted also mentioned this before, all name space dquot bill routine
> could be placed to dquot_xxx() for VFS quota user.
>
> However, AFAICS, they still have to be exported to other file systems
> which have their own quota management module, like XFS.
>
> Thanks,
> -Jeff
>
Do you have a personal need to have it working with xfs, or is the use 
you are pursuing achievable with the other filesystems?

Unless you have a reason yourself to use xfs, I'd say don't bother with 
it too much at the moment. get it working for the standard interface first.