linux-ext4 - Re: [patch V2 6/7] fs/jbd2: Make state lock a spinlock

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Date:   Thu, 1 Aug 2019 13:28:49 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Sebastian Siewior <bigeasy@...utronix.de>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Julia Cartwright <julia@...com>, Jan Kara <jack@...e.com>,
        Theodore Tso <tytso@....edu>, Mark Fasheh <mark@...heh.com>,
        Joseph Qi <joseph.qi@...ux.alibaba.com>,
        Joel Becker <jlbec@...lplan.org>, linux-ext4@...r.kernel.org,
        Jan Kara <jack@...e.cz>, Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org
Subject: Re: [patch V2 6/7] fs/jbd2: Make state lock a spinlock

On Thu, Aug 01, 2019 at 03:01:32AM +0200, Thomas Gleixner wrote:

> @@ -1931,7 +1932,7 @@ static void __jbd2_journal_temp_unlink_b
>  	transaction_t *transaction;
>  	struct buffer_head *bh = jh2bh(jh);
>  
> -	J_ASSERT_JH(jh, jbd_is_locked_bh_state(bh));
> +	assert_spin_locked(&jh->state_lock);
>  	transaction = jh->b_transaction;
>  	if (transaction)
>  		assert_spin_locked(&transaction->t_journal->j_list_lock);

> @@ -2415,7 +2416,7 @@ void __jbd2_journal_file_buffer(struct j
>  	int was_dirty = 0;
>  	struct buffer_head *bh = jh2bh(jh);
>  
> -	J_ASSERT_JH(jh, jbd_is_locked_bh_state(bh));
> +	assert_spin_locked(&jh->state_lock);
>  	assert_spin_locked(&transaction->t_journal->j_list_lock);
>  
>  	J_ASSERT_JH(jh, jh->b_jlist < BJ_Types);

> @@ -2500,7 +2501,7 @@ void __jbd2_journal_refile_buffer(struct
>  	int was_dirty, jlist;
>  	struct buffer_head *bh = jh2bh(jh);
>  
> -	J_ASSERT_JH(jh, jbd_is_locked_bh_state(bh));
> +	assert_spin_locked(&jh->state_lock);
>  	if (jh->b_transaction)
>  		assert_spin_locked(&jh->b_transaction->t_journal->j_list_lock);
>  

Do those want to be:

  lockdep_assert_held(&jh->state_lock);

instead? The difference is of course that lockdep_assert_held() requires
the current context to hold the lock, where assert_*_locked() merely
checks _someone_ holds it.