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Date:   Wed, 2 Dec 2020 18:45:04 -0800
From:   Ira Weiny <>
To:     Linus Torvalds <>
Cc:     Eric Sandeen <>,
        Miklos Szeredi <>,
        David Howells <>,
        linux-fsdevel <>,
        linux-man <>,
        Linux Kernel Mailing List <>,
        xfs <>,
        Ext4 Developers List <>,
        Xiaoli Feng <>
Subject: Re: [PATCH 1/2] uapi: fix statx attribute value overlap for DAX &

On Wed, Dec 02, 2020 at 12:42:08PM -0800, Linus Torvalds wrote:
> On Tue, Dec 1, 2020 at 6:16 PM Ira Weiny <> wrote:
> >
> > This will force a change to xfstests at a minimum.  And I do know of users who
> > have been using this value.  But I have gotten inquires about using the feature
> > so there are users out there.
> If it's only a few tests that fail, I wouldn't worry about it, and the
> tests should just be updated.


> But if there are real user concerns, we may need to have some kind of
> compat code. Because of the whole "no regressions" thing.
> What would the typical failure cases be in practice?

The failure will be a user not seeing their file operating in DAX mode when
they expect it to.

I discussed this with Dan Williams today.  He and I agreed the flag is new
enough that we don't think users have any released code to the API just yet.
So I think we will be ok.

Also, after learning what the other flag was for I agree with Christoph that
the impact is going to be minimal since users are not typically operating on
the root inode.

So I think we are ok with just making the change and getting it into stable



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