linux-ext4 - Re: [PATCH] JBD:need hold j_state_lock to updates to transaction t_state to T

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Date:	Mon, 12 May 2008 11:34:27 +0200
From:	Jan Kara <jack@...e.cz>
To:	Mingming Cao <cmm@...ibm.com>
Cc:	akpm@...ux-foundation.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] JBD:need hold j_state_lock to updates to transaction
	t_state to T_COMMIT

On Fri 09-05-08 15:39:43, Mingming Cao wrote:
> Updating the current transaction's t_state is being protected by j_state_lock.
> We need to do the same when updating the t_state to T_COMMIT.
> 
> Signed-off-by: Mingming Cao <cmm@...ibm.com>
  Thanks for the fix. You can add
Acked-by: Jan Kara <jack@...e.cz>
(and also to the JBD2 patch)

										Honza
> ---
>  fs/jbd/commit.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> Index: linux-2.6.26-rc1/fs/jbd/commit.c
> ===================================================================
> --- linux-2.6.26-rc1.orig/fs/jbd/commit.c	2008-05-09 14:46:25.000000000 -0700
> +++ linux-2.6.26-rc1/fs/jbd/commit.c	2008-05-09 15:11:00.000000000 -0700
> @@ -478,7 +478,9 @@ void journal_commit_transaction(journal_
>  	 * transaction!  Now comes the tricky part: we need to write out
>  	 * metadata.  Loop over the transaction's entire buffer list:
>  	 */
> +	spin_lock(&journal->j_state_lock);
>  	commit_transaction->t_state = T_COMMIT;
> +	spin_unlock(&journal->j_state_lock);
>  
>  	J_ASSERT(commit_transaction->t_nr_buffers <=
>  		 commit_transaction->t_outstanding_credits);
> 
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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