linux-kernel - [regression] NFS readdir change break fully cached nfs root

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Message-ID: <20101102180051.GA26089@basil.fritz.box>
Date:	Tue, 2 Nov 2010 19:00:51 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Trond.Myklebust@...app.com, bjschuma@...app.com,
	torvalds@...ux-foundation.org, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [regression] NFS readdir change break fully cached nfs root


My NFS root test systems stopped booting with 2.6.37-rc1. It just
hangs after entering user space.

The NFS root setup uses a slightly fancy parameter setup to minimize 
network traffic:

nfsroot=10.23.204.1:/home/nfsroot/edwin,nocto,acregmin=86400,acregmax=86400,acdirmin=86400,acdirmax=86400 root=/dev/nfs

I bisected it down to this commit from Bryan.

Unfortunately it's not trivially revertable because that conflicts
with later patches.

commit d1bacf9eb2fd0e7ef870acf84b9e3b157dcfa7dc
Author: Bryan Schumaker <bjschuma@...app.com>
Date:   Fri Sep 24 14:48:42 2010 -0400

    NFS: add readdir cache array


-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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