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Date: Mon, 7 Nov 2011 13:58:23 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Davidlohr Bueso <dave@gnu.org>
Cc: Lennart Poettering <mzxreary@0pointer.de>,
        Christoph Hellwig <hch@infradead.org>, Hugh Dickins <hughd@google.com>,
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        lkml <linux-kernel@vger.kernel.org>, linux-mm@kvack.org,
        Kay Sievers <kay.sievers@vrfy.org>
Subject: Re: [RFC PATCH] tmpfs: support user quotas
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> Right, rlimit approach guarantees a simple way of dealing with users
> across all tmpfs instances.

Which is almost certainly not what you want to happen. Think about direct
rendering.

For simple stuff tmpfs already supports size/nr_blocks/nr_inodes mount
options so you can mount private resource constrained tmpfs objects
already without kernel changes. No rlimit hacks needed - and rlimit is
the wrong API anyway.

Alan