Message-ID: <4D791FA3.3070100@pengutronix.de>
Date: Thu, 10 Mar 2011 19:59:47 +0100
From: Marc Kleine-Budde <mkl@pengutronix.de>
Organization: Pengutronix
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To: Dr Andrew John Hughes <ahughes@redhat.com>
CC: linux-kernel@vger.kernel.org, stable@kernel.org,
        Trond.Myklebust@netapp.com
Subject: Re: NFS regression in 2.6.37.1 (current stable)
References: <20110310185321.GA22030@rivendell.middle-earth.co.uk>
In-Reply-To: <20110310185321.GA22030@rivendell.middle-earth.co.uk>
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Hello Andrew,

On 03/10/2011 07:53 PM, Dr Andrew John Hughes wrote:
> [Please CC me on responses as I'm not subscribed]
>=20
> Hi,
>=20
> I seem to have uncovered a regression in the NFS code between 2.6.37 an=
d 2.6.37.1
> caused by this changeset:
>=20
> commit 55ea499d60aefa3d03a77fc8590c26b5881faa92
> Author: Trond Myklebust <Trond.Myklebust@netapp.com>
> Date:   Sat Jan 8 17:45:38 2011 -0500
> NFS: Don't use vm_map_ram() in readdir
> http://git.kernel.org/?p=3Dlinux/kernel/git/stable/linux-2.6.37.y.git;a=
=3Dcommit;h=3D6650239a4b01077e80d5a4468562756d77afaa59
>=20
> With this change applied, copying of files between NFS and non-NFS
> mounts seems to be broken.  The easiest way I've found to replicate
> this myself is to use a VCS to do a clone of a tree on a NFS mount to
> a directory on a non-NFS mount.  I used Mercurial, as I had Mercurial
> trees to hand from work on IcedTea, but I assume doing it with a git
> tree such as the linux tree would also work.  The idea is to do
> something which involves copying over a bunch of directories and
> checking the result is readable.
>=20
> $ hg clone $HOME/projects/openjdk/icedtea6-hg
> destination directory: icedtea6-hg
> updating to branch default
> abort:
> data/contrib/templater/hotspot/src/cpu/CPU/vm/bytecodeInterpreter_CPU.i=
nline.hpp.i@16d04ce16287:
> no match found!
>=20
> In the above, $HOME is an NFS mount and $PWD is a local reiserfs
> partition.  I initially hit failures doing builds with source on $HOME
> and the build directory on a local reiserfs partition.  In that
> scenario, it would fail as not being able to find files that should
> have been copied over.
>=20
> Reverting the changeset fixes the issue.  2.6.37.2 still has the bug.
> I haven't checked 2.6.37.3 yet but I didn't see any NFS changes in ther=
e.

Which arch are you using? As this patch is also part of the upcoming
2.6.38, can you check if the latest .38 is affected, too?

cheers, Marc

--=20
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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