linux-kernel - Re: [PATCH 3/3] ovl: Use real disk UUID for origin file handles

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Message-ID: <CAOQ4uxg6dKr4XB3yAkfGd_ehZkBMcoNHiF5CeB9=3aca44yHRg@mail.gmail.com>
Date: Thu, 22 Jan 2026 21:07:27 +0100
From: Amir Goldstein <amir73il@...il.com>
To: André Almeida <andrealmeid@...lia.com>
Cc: Christoph Hellwig <hch@....de>, Chuck Lever <chuck.lever@...cle.com>, Jeff Layton <jlayton@...nel.org>, 
	NeilBrown <neil@...wn.name>, Olga Kornievskaia <okorniev@...hat.com>, Dai Ngo <Dai.Ngo@...cle.com>, 
	Tom Talpey <tom@...pey.com>, Carlos Maiolino <cem@...nel.org>, Chris Mason <clm@...com>, 
	David Sterba <dsterba@...e.com>, Miklos Szeredi <miklos@...redi.hu>, 
	Christian Brauner <brauner@...nel.org>, Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>, 
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	Qu Wenruo <wqu@...e.com>, linux-btrfs@...r.kernel.org, linux-unionfs@...r.kernel.org, 
	kernel-dev@...lia.com, vivek@...labora.com, 
	Ludovico de Nittis <ludovico.denittis@...labora.com>
Subject: Re: [PATCH 3/3] ovl: Use real disk UUID for origin file handles

On Tue, Jan 20, 2026 at 4:12 PM Amir Goldstein <amir73il@...il.com> wrote:
>
> On Mon, Jan 19, 2026 at 5:56 PM André Almeida <andrealmeid@...lia.com> wrote:
> >
...
> > Actually they are not in the same fs, upper and lower are coming from
> > different fs', so when trying to mount I get the fallback to
> > `uuid=null`. A quick hack circumventing this check makes the mount work.
> >
> > If you think this is the best way to solve this issue (rather than
> > following the VFS helper path for instance),
>
> That's up to you if you want to solve the "all lower layers on same fs"
> or want to also allow lower layers on different fs.
> The former could be solved by relaxing the ovl rules.
>
> > please let me know how can
> > I safely lift this restriction, like maybe adding a new flag for this?
>
> I think the attached patch should work for you and should not
> break anything.
>
> It's only sanity tested and will need to write tests to verify it.
>

Andre,

I tested the patch and it looks good on my side.
If you want me to queue this patch for 7.0,
please let me know if it addresses your use case.

Thanks,
Amir.