linux-kernel - Re: [PATCH 2/4] jbd: relocate assert after state lock in journal_commit

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Date:	Thu, 1 Aug 2013 23:24:54 +0200
From:	Jan Kara <jack@...e.cz>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] jbd: relocate assert after state lock in
 journal_commit_transaction()

On Thu 01-08-13 15:01:06, Paul Gortmaker wrote:
> Backport of jbd2 commit 3ca841c106fd6cd2c942985977a5d126434a8dd6
> ("jbd2: relocate assert after state lock in journal_commit_transaction()")
> 
> Quoting that commit:
>  ---------------
>  The state lock is taken after we are doing an assert on the state
>  value, not before.  So we might in fact be doing an assert on a
>  transient value.  Ensure the state check is within the scope of
>  the state lock being taken.
>  ---------------
  Thanks. I've added this patch to my tree.

								Honza
> 
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> ---
>  fs/jbd/commit.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c
> index 11bb11f..bb217dc 100644
> --- a/fs/jbd/commit.c
> +++ b/fs/jbd/commit.c
> @@ -340,13 +340,13 @@ void journal_commit_transaction(journal_t *journal)
>  	J_ASSERT(journal->j_committing_transaction == NULL);
>  
>  	commit_transaction = journal->j_running_transaction;
> -	J_ASSERT(commit_transaction->t_state == T_RUNNING);
>  
>  	trace_jbd_start_commit(journal, commit_transaction);
>  	jbd_debug(1, "JBD: starting commit of transaction %d\n",
>  			commit_transaction->t_tid);
>  
>  	spin_lock(&journal->j_state_lock);
> +	J_ASSERT(commit_transaction->t_state == T_RUNNING);
>  	commit_transaction->t_state = T_LOCKED;
>  
>  	trace_jbd_commit_locking(journal, commit_transaction);
> -- 
> 1.8.1.2
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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