linux-kernel - Re: [PATCH v2] fs: jbd2: fix an incorrect warn log

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Message-ID: <20230413101201.gqtqhuecra3fk7x4@quack3>
Date:   Thu, 13 Apr 2023 12:12:01 +0200
From:   Jan Kara <jack@...e.cz>
To:     Guoqing Cai <u202112087@...t.edu.cn>
Cc:     Theodore Ts'o <tytso@....edu>, Jan Kara <jack@...e.com>,
        HUST OS Kernel Contribution 
        <hust-os-kernel-patches@...glegroups.com>,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] fs: jbd2: fix an incorrect warn log

On Thu 13-04-23 17:57:39, Guoqing Cai wrote:
> In jbd2_journal_load(), when journal_reset fails, it prints an incorrect
> warn log.
> 
> Fix this by changing the goto statement to return statement.
> 
> Also, return actual error code from jbd2_journal_recover() and journal_reset().
> 
> Signed-off-by: Guoqing Cai <u202112087@...t.edu.cn>

Looks good. Feel free to add:

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

								Honza

> ---
> changelog:
> - Add a warning log when journal_reset failed.
> - Return the actual error code.
> ---
>  fs/jbd2/journal.c | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index e80c781731f8..147733dd5cc3 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -2082,8 +2082,11 @@ int jbd2_journal_load(journal_t *journal)
>  
>  	/* Let the recovery code check whether it needs to recover any
>  	 * data from the journal. */
> -	if (jbd2_journal_recover(journal))
> -		goto recovery_error;
> +	err = jbd2_journal_recover(journal);
> +	if (err) {
> +		pr_warn("JBD2: journal recovery failed\n");
> +		return err;
> +	}
>  
>  	if (journal->j_failed_commit) {
>  		printk(KERN_ERR "JBD2: journal transaction %u on %s "
> @@ -2100,15 +2103,14 @@ int jbd2_journal_load(journal_t *journal)
>  	/* OK, we've finished with the dynamic journal bits:
>  	 * reinitialise the dynamic contents of the superblock in memory
>  	 * and reset them on disk. */
> -	if (journal_reset(journal))
> -		goto recovery_error;
> +	err = journal_reset(journal);
> +	if (err) {
> +		pr_warn("JBD2: journal reset failed\n");
> +		return err;
> +	}
>  
>  	journal->j_flags |= JBD2_LOADED;
>  	return 0;
> -
> -recovery_error:
> -	printk(KERN_WARNING "JBD2: recovery failed\n");
> -	return -EIO;
>  }
>  
>  /**
> -- 
> 2.40.0
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR