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Date:   Thu, 12 Oct 2017 11:55:22 -0400
From:   Theodore Ts'o <>
To:     Ross Zwisler <>
Cc:     Jan Kara <>,,
        Andreas Dilger <>,
        Christoph Hellwig <>,
        Dan Williams <>,
        Dave Chinner <>,,
Subject: Re: [PATCH v2 2/5] ext4: prevent data corruption with journaling +

On Mon, Sep 11, 2017 at 11:05:23PM -0600, Ross Zwisler wrote:
> The current code has the potential for data corruption when changing an
> inode's journaling mode, as that can result in a subsequent unsafe change
> in S_DAX.
> I've captured an instance of this data corruption in the following fstest:
> Prevent this data corruption from happening by disallowing changes to the
> journaling mode if the '-o dax' mount option was used.  This means that for
> a given filesystem we could have a mix of inodes using either DAX or
> data journaling, but whatever state the inodes are in will be held for the
> duration of the mount.
> Signed-off-by: Ross Zwisler <>
> Suggested-by: Jan Kara <>

Thanks, applied.

						- Ted

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