linux-kernel - Re: [RFC 5/9] ext4: Add commit

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Message-ID: <20220223094254.fmowjdq4dbig5elz@quack3.lan>
Date:   Wed, 23 Feb 2022 10:42:54 +0100
From:   Jan Kara <jack@...e.cz>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>
Cc:     linux-ext4@...r.kernel.org,
        Harshad Shirwadkar <harshadshirwadkar@...il.com>,
        Theodore Ts'o <tytso@....edu>, Jan Kara <jack@...e.cz>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 5/9] ext4: Add commit_tid info in jbd debug log

On Wed 23-02-22 02:04:13, Ritesh Harjani wrote:
> This adds commit_tid argument in ext4_fc_update_stats()
> so that we can add this information too in jbd_debug logs.
> This is also required in a later patch to pass the commit_tid info in
> ext4_fc_commit_start/stop() trace events.
> 
> Signed-off-by: Ritesh Harjani <riteshh@...ux.ibm.com>

Looks good. Feel free to add:

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

								Honza

> ---
>  fs/ext4/fast_commit.c | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
> index 7fb1eceef30c..ee32aac0cbbf 100644
> --- a/fs/ext4/fast_commit.c
> +++ b/fs/ext4/fast_commit.c
> @@ -1127,11 +1127,12 @@ static int ext4_fc_perform_commit(journal_t *journal)
>  }
>  
>  static void ext4_fc_update_stats(struct super_block *sb, int status,
> -				 u64 commit_time, int nblks)
> +				 u64 commit_time, int nblks, tid_t commit_tid)
>  {
>  	struct ext4_fc_stats *stats = &EXT4_SB(sb)->s_fc_stats;
>  
> -	jbd_debug(1, "Fast commit ended with status = %d", status);
> +	jbd_debug(1, "Fast commit ended with status = %d for tid %u",
> +			status, commit_tid);
>  	if (status == EXT4_FC_STATUS_OK) {
>  		stats->fc_num_commits++;
>  		stats->fc_numblks += nblks;
> @@ -1181,14 +1182,16 @@ int ext4_fc_commit(journal_t *journal, tid_t commit_tid)
>  		if (atomic_read(&sbi->s_fc_subtid) <= subtid &&
>  			commit_tid > journal->j_commit_sequence)
>  			goto restart_fc;
> -		ext4_fc_update_stats(sb, EXT4_FC_STATUS_SKIPPED, 0, 0);
> +		ext4_fc_update_stats(sb, EXT4_FC_STATUS_SKIPPED, 0, 0,
> +				commit_tid);
>  		return 0;
>  	} else if (ret) {
>  		/*
>  		 * Commit couldn't start. Just update stats and perform a
>  		 * full commit.
>  		 */
> -		ext4_fc_update_stats(sb, EXT4_FC_STATUS_FAILED, 0, 0);
> +		ext4_fc_update_stats(sb, EXT4_FC_STATUS_FAILED, 0, 0,
> +				commit_tid);
>  		return jbd2_complete_transaction(journal, commit_tid);
>  	}
>  
> @@ -1220,12 +1223,12 @@ int ext4_fc_commit(journal_t *journal, tid_t commit_tid)
>  	 * don't react too strongly to vast changes in the commit time
>  	 */
>  	commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time));
> -	ext4_fc_update_stats(sb, status, commit_time, nblks);
> +	ext4_fc_update_stats(sb, status, commit_time, nblks, commit_tid);
>  	return ret;
>  
>  fallback:
>  	ret = jbd2_fc_end_commit_fallback(journal);
> -	ext4_fc_update_stats(sb, status, 0, 0);
> +	ext4_fc_update_stats(sb, status, 0, 0, commit_tid);
>  	return ret;
>  }
>  
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR