linux-kernel - Re: NFS regression in 2.6.37.1 (current stable)

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Message-ID: <4D791FA3.3070100@pengutronix.de>
Date:	Thu, 10 Mar 2011 19:59:47 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Dr Andrew John Hughes <ahughes@...hat.com>
CC:	linux-kernel@...r.kernel.org, stable@...nel.org,
	Trond.Myklebust@...app.com
Subject: Re: NFS regression in 2.6.37.1 (current stable)

Hello Andrew,

On 03/10/2011 07:53 PM, Dr Andrew John Hughes wrote:
> [Please CC me on responses as I'm not subscribed]
> 
> Hi,
> 
> I seem to have uncovered a regression in the NFS code between 2.6.37 and 2.6.37.1
> caused by this changeset:
> 
> commit 55ea499d60aefa3d03a77fc8590c26b5881faa92
> Author: Trond Myklebust <Trond.Myklebust@...app.com>
> Date:   Sat Jan 8 17:45:38 2011 -0500
> NFS: Don't use vm_map_ram() in readdir
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.37.y.git;a=commit;h=6650239a4b01077e80d5a4468562756d77afaa59
> 
> 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.
> 
> $ 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.inline.hpp.i@...04ce16287:
> no match found!
> 
> 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.
> 
> 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 there.

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

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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