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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@netapp.com>
Date: Fri Sep 24 14:48:42 2010 -0400

NFS: add readdir cache array


-Andi

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


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