linux-ext4 - Re: [PATCH] common/rc: set maximum label length for ext4

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Date:   Mon, 31 Jan 2022 09:07:00 -0800
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     Lukas Czerner <lczerner@...hat.com>
Cc:     fstests@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] common/rc: set maximum label length for ext4

On Tue, Nov 23, 2021 at 11:11:19AM +0100, Lukas Czerner wrote:
> Set maximum label length for ext4 in _label_get_max() to be able to test
> online file system label set/get ioctls.
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> ---
>  common/rc | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/common/rc b/common/rc
> index 8e351f17..50d6d0bd 100644
> --- a/common/rc
> +++ b/common/rc
> @@ -4545,6 +4545,9 @@ _label_get_max()
>  	f2fs)
>  		echo 255
>  		;;
> +	ext2|ext3|ext4)
> +		echo 16

After reviewing the ext4 ondisk format, 16 is the correct value.

Though I wonder, what actually prevents generic/492 from running on old
kernels without GETLABEL support?

Either way this patch is ok, so...
Reviewed-by: Darrick J. Wong <djwong@...nel.org>

--D

> +		;;
>  	*)
>  		_notrun "$FSTYP does not define maximum label length"
>  		;;
> -- 
> 2.31.1
>