linux-kernel - Re: [PATCH v5 0/9] ovl: Enable support for casefold layers

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Message-ID: <CAOQ4uxiVFubhiC9Ftwt3kG=RoGSK7rBpPv5Z0GdZfk17dBO6YQ@mail.gmail.com>
Date: Thu, 14 Aug 2025 21:06:21 +0200
From: Amir Goldstein <amir73il@...il.com>
To: André Almeida <andrealmeid@...lia.com>
Cc: Miklos Szeredi <miklos@...redi.hu>, Theodore Tso <tytso@....edu>, linux-unionfs@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	Alexander Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
	kernel-dev@...lia.com, Gabriel Krisman Bertazi <krisman@...nel.org>
Subject: Re: [PATCH v5 0/9] ovl: Enable support for casefold layers

On Thu, Aug 14, 2025 at 7:30 PM André Almeida <andrealmeid@...lia.com> wrote:
>
> Em 14/08/2025 14:22, André Almeida escreveu:
> > Hi all,
> >
> > We would like to support the usage of casefold layers with overlayfs to
> > be used with container tools. This use case requires a simple setup,
> > where every layer will have the same encoding setting (i.e. Unicode
> > version and flags), using one upper and one lower layer.
> >
>
> Amir,
>
> I tried to run your xfstest for casefolded ovl[1] but I can see that it
> still requires some work. I tried to fix some of the TODO's but I didn't
> managed to mkfs the base fs with casefold enabled...

When you write mkfs the base fs, I suspect that you are running
check -overlay or something.

This is not how this test should be run.
It should run as a normal test on ext4 or any other fs  that supports casefold.

When you run check -g casefold, the generic test generic/556 will
be run if the test fs supports casefold (e.g. ext4).

The new added test belongs to the same group and should run
if you run check -g casefold if the test fs supports casefold (e.g. ext4).

> but we might as
> well discuss this in a dedicated xfstest email thread if you want to
> send a RFC for the test.
>
> [1]
> https://github.com/amir73il/xfstests/commit/03b3facf60e14cab9fc563ad54893563b4cb18e4
>
>

Can you point me to a branch with your ovl patches, so I can pull it
for testing?

Feel free to fix the 2 minor review comments on v5 in your branch.

Thanks,
Amir.