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Date: Fri, 9 Sep 2016 10:03:27 -0400
From: "Theodore Ts'o" <tytso@mit.edu>
To: Jan Kara <jack@suse.cz>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>,
        Xiao Guangrong <guangrong.xiao@linux.intel.com>,
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        Linux ACPI <linux-acpi@vger.kernel.org>,
        Stefan Hajnoczi <stefanha@redhat.com>
Subject: Re: DAX can not work on virtual nvdimm device
Message-ID: <20160909140327.r2j64s5xdaxnnxhx@thunk.org>
Mail-Followup-To: Theodore Ts'o <tytso@mit.edu>, Jan Kara <jack@suse.cz>,
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        Linux ACPI <linux-acpi@vger.kernel.org>,
        Stefan Hajnoczi <stefanha@redhat.com>
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 <20160902025738.GA26108@linux.intel.com>
 <20160906150620.GJ28922@quack2.suse.cz>
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On Fri, Sep 09, 2016 at 11:19:25AM +0200, Jan Kara wrote:
> > > > > 1. make the guest kernel based on your tree, the top commit is
> > > > >    10d7902fa0e82b (dax: unmap/truncate on device shutdown) and
> > > > >    the config file can be found in this thread.

What git tree is 10d7902fa0e82b from?

> Hum, nothing unusual in there. I've tried reproducing on a local SLE11 SP3
> machine (which is from about the same time) but everything works as
> expected there. Shrug...

I just tried reproducing it via "gce-xfstests --pmem-device shell"
with a downgraded e2fsprogs to stock upstream 1.42.12, and I can't
reproduce it with the ext4.git tree.  I'm not sure whether the git
commit is critical, though.  Is this a regression that was working
before?

Or it's possible that Red Hat did something weird with the CentOS 6
e2fsprogs....

					- Ted