From: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Subject: Re: [PATCH 1/4] Adds general codes to enforces project quota limits
Date: Wed, 24 Sep 2014 09:14:17 -0700
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> -#define MAXQUOTAS 2
> +#define MAXQUOTAS 3

This bloats every single inode in the system.  I think this would be a
good opportunity to move i_dquot into the per-filesystem structures
and provide a little get_dquots methods to get at them from the
quota code.