linux-kernel - Re: [PATCH v2] Updated locking documentation for transaction

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Message-ID: <20190319083342.GC17334@quack2.suse.cz>
Date:   Tue, 19 Mar 2019 09:33:42 +0100
From:   Jan Kara <jack@...e.cz>
To:     Alexander Lochmann <alexander.lochmann@...dortmund.de>
Cc:     Horst Schirmeier <horst.schirmeier@...dortmund.de>,
        Theodore Ts'o <tytso@....edu>, Jan Kara <jack@...e.com>,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Updated locking documentation for transaction_t

On Mon 18-03-19 19:42:37, Alexander Lochmann wrote:
> We used LockDoc to derive locking rules for each member
> of struct transaction_t.
> Based on those results, we extended the existing documentation
> by more members of struct inode, and updated the existing
> documentation.
> 
> Signed-off-by: Alexander Lochmann <alexander.lochmann@...dortmund.de>
> Signed-off-by: Horst Schirmeier <horst.schirmeier@...dortmund.de>

Thanks! You can add:

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

								Honza

> ---
>  include/linux/jbd2.h | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
> index 0f919d5fe84f..72f689746340 100644
> --- a/include/linux/jbd2.h
> +++ b/include/linux/jbd2.h
> @@ -534,6 +534,7 @@ struct transaction_chp_stats_s {
>   * The transaction keeps track of all of the buffers modified by a
>   * running transaction, and all of the buffers committed but not yet
>   * flushed to home for finished transactions.
> + * (Locking Documentation improved by LockDoc)
>   */
>  
>  /*
> @@ -585,7 +586,8 @@ struct transaction_s
>  	}			t_state;
>  
>  	/*
> -	 * Where in the log does this transaction's commit start? [no locking]
> +	 * Where in the log does this transaction's commit start?
> +	 * [journal_t.j_state_lock]
>  	 */
>  	unsigned long		t_log_start;
>  
> @@ -647,17 +649,17 @@ struct transaction_s
>  	unsigned long		t_max_wait;
>  
>  	/*
> -	 * When transaction started
> +	 * When transaction started [journal_t.j_state_lock]
>  	 */
>  	unsigned long		t_start;
>  
>  	/*
> -	 * When commit was requested
> +	 * When commit was requested [journal_t.j_state_lock]
>  	 */
>  	unsigned long		t_requested;
>  
>  	/*
> -	 * Checkpointing stats [j_checkpoint_sem]
> +	 * Checkpointing stats [journal_t.j_list_lock]
>  	 */
>  	struct transaction_chp_stats_s t_chp_stats;
>  
> -- 
> 2.20.1
> 
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR