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Re: [PATCH] xfs_quota: remove calls to XFS_QSYNC

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH] xfs_quota: remove calls to XFS_QSYNC
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 1 Feb 2012 05:24:36 -0500
Cc: Ben Myers <bpm@xxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Nathan Scott <nathans@xxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <20120131210110.GN9090@dastard>
References: <20120130115024.GA884@xxxxxxxxxxxxx> <CAAp5ZgNKsY-OrWyDNU70KUKYCZUX_EvzngAvBsBTgrgkK6KyMA@xxxxxxxxxxxxxx> <20120131162617.GF7762@xxxxxxx> <20120131210110.GN9090@dastard>
User-agent: Mutt/1.5.21 (2010-09-15)
On Wed, Feb 01, 2012 at 08:01:10AM +1100, Dave Chinner wrote:
> So effectively what that says to me is that quota only exports the
> real block usage, even though it internally tracks delalloc
> reservations. Perhaps an additionaly change to make in this case is
> to fold the reserved blocks into what is reported to the quota
> utilities?
> Indeed, what is exported to userspace via xfs_qm_export_dquot() is
> the information in the dquot core - the on-disk information - so
> perhaps all we need to do is export dqp->q_res_bcount (the count of
> real + reserved blocks) instead of the on-disk info?

That seems like a good idea, given that enforcement takes the
reservation into account.  To retain compatbility for the case of new
userspace and an old kernel I'd have to disable Q_XQUOTASYNC in the
kernel intead of in the tool, though.

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