linux-ext4 - Re: [PATCH] ext4: print file system UUID on mount, remount and unmount

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Date:   Tue, 8 Nov 2022 08:36:55 -0800
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     Lukas Czerner <lczerner@...hat.com>
Cc:     tytso@....edu, linux-ext4@...r.kernel.org,
        Lukas Herbolt <lukas@...bolt.com>
Subject: Re: [PATCH] ext4: print file system UUID on mount, remount and
 unmount

On Tue, Nov 08, 2022 at 03:50:42PM +0100, Lukas Czerner wrote:
> The device names are not necessarily consistent across reboots which can
> make it more difficult to identify the right file system when tracking
> down issues using system logs.
> 
> Print file system UUID string on every mount, remount and unmount to
> make this task easier.
> 
> This is similar to the functionality recently propsed for XFS.
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> Cc: Lukas Herbolt <lukas@...bolt.com>

Looks good to me,
Reviewed-by: Darrick J. Wong <djwong@...nel.org>

--D

> ---
>  fs/ext4/super.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 7cdd2138c897..4028bfc8206c 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -1206,7 +1206,8 @@ static void ext4_put_super(struct super_block *sb)
>  	ext4_unregister_sysfs(sb);
>  
>  	if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs unmount"))
> -		ext4_msg(sb, KERN_INFO, "unmounting filesystem.");
> +		ext4_msg(sb, KERN_INFO, "unmounting filesystem %pU.",
> +			 &sb->s_uuid);
>  
>  	ext4_unregister_li_request(sb);
>  	ext4_quota_off_umount(sb);
> @@ -5655,8 +5656,9 @@ static int ext4_fill_super(struct super_block *sb, struct fs_context *fc)
>  		descr = "out journal";
>  
>  	if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
> -		ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
> -			 "Quota mode: %s.", descr, ext4_quota_mode(sb));
> +		ext4_msg(sb, KERN_INFO, "mounted filesystem %pU with%s. "
> +			 "Quota mode: %s.", &sb->s_uuid, descr,
> +			 ext4_quota_mode(sb));
>  
>  	/* Update the s_overhead_clusters if necessary */
>  	ext4_update_overhead(sb, false);
> @@ -6611,8 +6613,8 @@ static int ext4_reconfigure(struct fs_context *fc)
>  	if (ret < 0)
>  		return ret;
>  
> -	ext4_msg(sb, KERN_INFO, "re-mounted. Quota mode: %s.",
> -		 ext4_quota_mode(sb));
> +	ext4_msg(sb, KERN_INFO, "re-mounted %pU. Quota mode: %s.",
> +		 &sb->s_uuid, ext4_quota_mode(sb));
>  
>  	return 0;
>  }
> -- 
> 2.38.1
>