linux-kernel - Re: Poor NFSv4 first impressions

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Message-ID: <20061106161747.GA12372@fieldses.org>
Date:	Mon, 6 Nov 2006 11:17:47 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Daniel J Blueman <daniel.blueman@...il.com>
Cc:	Jeff Garzik <jeff@...zik.org>, nfsv4@...ux-nfs.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Neil Brown <neilb@...e.de>
Subject: Re: Poor NFSv4 first impressions

On Mon, Nov 06, 2006 at 12:03:54PM +0000, Daniel J Blueman wrote:
> This has all the symptoms to an open EACCES NFSv4 bug in 2.6.18/19.
> This is fixed in:
> 
> http://www.citi.umich.edu/projects/nfsv4/linux/kernel-patches/2.6.19-rc3-2/linux-2.6.19-rc3-CITI_NFS4_ALL-2.diff
> (see http://www.citi.umich.edu/projects/nfsv4/linux/).
> 
> With this patch, I can run just great with NFSv4 home dir (etc)
> mounts; without, I get the symptom of many 0-byte temporary/lock files
> being created and often the inability to create files (!). Be sure to
> allow callback delegation connections in through your firewall for the
> extra performance ;-) .
> 
> Maybe it's too late for these fixes 2.6.19, but they should certainly
> make 2.6.19.1 IMHO.

Yeah, bad patch management on my part, apologies, I should have pushed
it as soon as I noticed the problem.

Investigating the problem revealed some ugliness (and some races which
will need further work), and I had hoped to have a more complete fix
before now.  Oh well.

Two patches follow; the first does a very simple cleanup, the second
solves the immediate problem in the most straightforward way I can see,
but is a bit of a hack.

--b.
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