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Re: [PATCH 2/7] Fix test whether kernel supports quotas

To: Jan Kara <jack@xxxxxxx>
Subject: Re: [PATCH 2/7] Fix test whether kernel supports quotas
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 19 May 2010 14:42:25 -0400
Cc: xfs@xxxxxxxxxxx, hch@xxxxxxxxxxxxx
In-reply-to: <1274276289-8839-3-git-send-email-jack@xxxxxxx>
References: <1274276289-8839-1-git-send-email-jack@xxxxxxx> <1274276289-8839-3-git-send-email-jack@xxxxxxx>
User-agent: Mutt/1.5.19 (2009-01-05)
On Wed, May 19, 2010 at 03:38:04PM +0200, Jan Kara wrote:
> For all 2.6 kernels presence of quota support in kernel can be detected by
> checking /proc/sys/fs/quota. This is actually more reliable than trying to
> mount a filesystem with quota options (for example because SCRATCH_DEV does
> not have to contain a filesystem type we are going to test).

It's not actually correct.  /proc/sys/fs/quota only gets registered by
fs/quota/dquot.c, which means it's not avaiable in a kernel that only
has XFS quotas.

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