linux-ext4 - Re: [PATCH 1/4] ext4: Handle error of ext4_setup_system

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Date:   Tue, 21 Jul 2020 12:36:28 +0200
From:   Lukas Czerner <lczerner@...hat.com>
To:     Jan Kara <jack@...e.cz>
Cc:     Ted Tso <tytso@....edu>, linux-ext4@...r.kernel.org,
        Ritesh Harjani <riteshh@...ux.ibm.com>,
        Wolfgang Frisch <wolfgang.frisch@...e.com>
Subject: Re: [PATCH 1/4] ext4: Handle error of ext4_setup_system_zone() on
 remount

On Wed, Jul 15, 2020 at 03:18:09PM +0200, Jan Kara wrote:
> ext4_setup_system_zone() can fail. Handle the failure in ext4_remount().
> 
> Signed-off-by: Jan Kara <jack@...e.cz>
> ---
>  fs/ext4/super.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 330957ed1f05..8e055ec57a2c 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -5653,7 +5653,10 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
>  		ext4_register_li_request(sb, first_not_zeroed);
>  	}
>  
> -	ext4_setup_system_zone(sb);
> +	err = ext4_setup_system_zone(sb);
> +	if (err)
> +		goto restore_opts;
> +

Thanks Jan, this looks good. But while you're at it, ext4_remount is
missing ext4_release_system_zone() and so it we want to enable block_validity
on remount and it fails after ext4_setup_system_zone() we wont release
it. This *I think* means that we would end up with block_validity
enabled without user knowing about it ?

-Lukas

>  	if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
>  		err = ext4_commit_super(sb, 1);
>  		if (err)
> -- 
> 2.16.4
>