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

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Message-ID: <e2238a17-3d0a-4c30-bc81-65c8c4da98e6@igalia.com>
Date: Fri, 15 Aug 2025 10:33:57 -0300
From: André Almeida <andrealmeid@...lia.com>
To: Amir Goldstein <amir73il@...il.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

Hi Amir,

On 8/14/25 21:06, Amir Goldstein wrote:
> 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).
>
I see, I used `check -overlay` indeed, thanks!

>> 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?

You can find my branch here, based on top of vfs.all: 
https://gitlab.freedesktop.org/andrealmeid/linux/-/commits/ovl_casefold

I fixed the following minor issues:

- 4/9: dropped the `kfree(cf_name);` - 6/9: fixed kernel robot warning 
`unused variable 'ofs'` - 8/9: change pr_warn_ratelimited() string

>
> Feel free to fix the 2 minor review comments on v5 in your branch.
>
> Thanks,
> Amir.