linux-kernel - Re: [PATCH v3] Updated locking documentation for transaction

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Message-ID: <af5a4a51-c1e4-ab4a-14b4-5b0f120bd1be@tu-dortmund.de>
Date:   Thu, 20 Jun 2019 22:45:52 +0200
From:   Alexander Lochmann <alexander.lochmann@...dortmund.de>
To:     tytso@....edu
Cc:     Horst Schirmeier <horst.schirmeier@...dortmund.de>,
        Jan Kara <jack@...e.com>, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] Updated locking documentation for transaction_t

Hi Ted,

Have you had the chance to review the most recent version of the patch?
Does it look reasonable to you?

Cheers,
Alex

On 08.04.19 10:35, 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 transaction_t, and updated the existing
> documentation.
> 
> Signed-off-by: Alexander Lochmann <alexander.lochmann@...dortmund.de>
> Signed-off-by: Horst Schirmeier <horst.schirmeier@...dortmund.de>
> ---
>  include/linux/jbd2.h | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
> index 0f919d5fe84f..34b728e2b702 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)
>   */
>  
>  /*
> @@ -652,12 +653,12 @@ struct transaction_s
>  	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;
>  
> 

-- 
Technische Universität Dortmund
Alexander Lochmann                PGP key: 0xBC3EF6FD
Otto-Hahn-Str. 16                 phone:  +49.231.7556141
D-44227 Dortmund                  fax:    +49.231.7556116
http://ess.cs.tu-dortmund.de/Staff/al



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