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:
>
> https://patchwork.kernel.org/patch/9948377/
>
> 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 <[email protected]>
> Suggested-by: Jan Kara <[email protected]>
Thanks, applied.
- Ted
