linux-ext4 - Re: [RFC PATCH] ext4: add unmount filesystem message

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Message-ID: <20220412164009.n24vnb2ivzjihaw6@quack3.lan>
Date:   Tue, 12 Apr 2022 18:40:09 +0200
From:   Jan Kara <jack@...e.cz>
To:     Zhang Yi <yi.zhang@...wei.com>
Cc:     linux-ext4@...r.kernel.org, tytso@....edu,
        adilger.kernel@...ger.ca, jack@...e.cz, yukuai3@...wei.com,
        yebin10@...wei.com, liuzhiqiang26@...wei.com, liangyun2@...wei.com
Subject: Re: [RFC PATCH] ext4: add unmount filesystem message

On Tue 12-04-22 22:53:20, Zhang Yi wrote:
> Now that we have kernel message at mount time, system administrator
> could acquire the mount time, device and options easily. But we don't
> have corresponding unmounting message at umount time, so we cannot know
> if someone umount a filesystem easily. Some of the modern filesystems
> (e.g. xfs) have the umounting kernel message, so add one for ext4
> filesystem for convenience.
> 
>  EXT4-fs (sdb): mounted filesystem with ordered data mode. Quota mode: none.
>  EXT4-fs (sdb): unmounting filesystem.
> 
> Signed-off-by: Zhang Yi <yi.zhang@...wei.com>

Makes sense. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/ext4/super.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 81749eaddf4c..bdecf62f4b55 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -1199,6 +1199,9 @@ static void ext4_put_super(struct super_block *sb)
>  	int aborted = 0;
>  	int i, err;
>  
> +	if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs unmount"))
> +		ext4_msg(sb, KERN_INFO, "unmounting filesystem.");
> +
>  	ext4_unregister_li_request(sb);
>  	ext4_quota_off_umount(sb);
>  
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR