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Date:   Tue, 12 Sep 2017 11:03:49 +0200
From:   Simon Ruderich <>
To:     Andreas Dilger <>
Cc:     Ross Zwisler <>,
        Soccer Liu <>,,
        "" <>
Subject: Re: Unexpected writes seen on a Read-only, DAX enabled EXT4 fs

On Mon, Sep 11, 2017 at 02:31:41PM -0600, Andreas Dilger wrote:
> On Sep 11, 2017, at 12:21 PM, Ross Zwisler wrote:
>> On Sat, Sep 09, 2017 at 05:10:26PM +0000, Soccer Liu wrote:
>>> [snip]
>>> Based on the following Mount documentation below, I did mount this ext fs
>>> with ro and noloadAre there any other options that I could use to totally
>>> eliminate those unexpected writes?
> [snip]
> Also, ext4 journal recovery will be done on the filesystem regardless of
> whether it is mounted read-only or not.

I thought the noload option should prevent journal recovery and
thus be truly read-only. At least it worked on a read-only device
for me.

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