linux-ext4 - Re: [PATCH 08/12] jbd2: cleanup journal_init

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Date:   Thu, 3 Aug 2023 17:48:34 +0200
From:   Jan Kara <jack@...e.cz>
To:     Zhang Yi <yi.zhang@...weicloud.com>
Cc:     linux-ext4@...r.kernel.org, tytso@....edu,
        adilger.kernel@...ger.ca, jack@...e.cz, yi.zhang@...wei.com,
        chengzhihao1@...wei.com, yukuai3@...wei.com
Subject: Re: [PATCH 08/12] jbd2: cleanup journal_init_common()

On Tue 04-07-23 21:42:29, Zhang Yi wrote:
> From: Zhang Yi <yi.zhang@...wei.com>
> 
> Adjust the initialization sequence and error handle of journal_t, moving
> load superblock to the begin, and classify others initialization.
> 
> Signed-off-by: Zhang Yi <yi.zhang@...wei.com>

Looks good. Feel free to add:

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

								Honza

> ---
>  fs/jbd2/journal.c | 45 ++++++++++++++++++++++++---------------------
>  1 file changed, 24 insertions(+), 21 deletions(-)
> 
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index 210b532a3673..065b5e789299 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -1541,6 +1541,16 @@ static journal_t *journal_init_common(struct block_device *bdev,
>  	if (!journal)
>  		return NULL;
>  
> +	journal->j_blocksize = blocksize;
> +	journal->j_dev = bdev;
> +	journal->j_fs_dev = fs_dev;
> +	journal->j_blk_offset = start;
> +	journal->j_total_len = len;
> +
> +	err = journal_load_superblock(journal);
> +	if (err)
> +		goto err_cleanup;
> +
>  	init_waitqueue_head(&journal->j_wait_transaction_locked);
>  	init_waitqueue_head(&journal->j_wait_done_commit);
>  	init_waitqueue_head(&journal->j_wait_commit);
> @@ -1552,12 +1562,15 @@ static journal_t *journal_init_common(struct block_device *bdev,
>  	mutex_init(&journal->j_checkpoint_mutex);
>  	spin_lock_init(&journal->j_revoke_lock);
>  	spin_lock_init(&journal->j_list_lock);
> +	spin_lock_init(&journal->j_history_lock);
>  	rwlock_init(&journal->j_state_lock);
>  
>  	journal->j_commit_interval = (HZ * JBD2_DEFAULT_MAX_COMMIT_AGE);
>  	journal->j_min_batch_time = 0;
>  	journal->j_max_batch_time = 15000; /* 15ms */
>  	atomic_set(&journal->j_reserved_credits, 0);
> +	lockdep_init_map(&journal->j_trans_commit_map, "jbd2_handle",
> +			 &jbd2_trans_commit_key, 0);
>  
>  	/* The journal is marked for error until we succeed with recovery! */
>  	journal->j_flags = JBD2_ABORT;
> @@ -1567,18 +1580,10 @@ static journal_t *journal_init_common(struct block_device *bdev,
>  	if (err)
>  		goto err_cleanup;
>  
> -	spin_lock_init(&journal->j_history_lock);
> -
> -	lockdep_init_map(&journal->j_trans_commit_map, "jbd2_handle",
> -			 &jbd2_trans_commit_key, 0);
> -
> -	/* journal descriptor can store up to n blocks -bzzz */
> -	journal->j_blocksize = blocksize;
> -	journal->j_dev = bdev;
> -	journal->j_fs_dev = fs_dev;
> -	journal->j_blk_offset = start;
> -	journal->j_total_len = len;
> -	/* We need enough buffers to write out full descriptor block. */
> +	/*
> +	 * journal descriptor can store up to n blocks, we need enough
> +	 * buffers to write out full descriptor block.
> +	 */
>  	n = journal->j_blocksize / jbd2_min_tag_size();
>  	journal->j_wbufsize = n;
>  	journal->j_fc_wbuf = NULL;
> @@ -1587,7 +1592,8 @@ static journal_t *journal_init_common(struct block_device *bdev,
>  	if (!journal->j_wbuf)
>  		goto err_cleanup;
>  
> -	err = journal_load_superblock(journal);
> +	err = percpu_counter_init(&journal->j_checkpoint_jh_count, 0,
> +				  GFP_KERNEL);
>  	if (err)
>  		goto err_cleanup;
>  
> @@ -1596,21 +1602,18 @@ static journal_t *journal_init_common(struct block_device *bdev,
>  	journal->j_shrinker.count_objects = jbd2_journal_shrink_count;
>  	journal->j_shrinker.seeks = DEFAULT_SEEKS;
>  	journal->j_shrinker.batch = journal->j_max_transaction_buffers;
> -
> -	if (percpu_counter_init(&journal->j_checkpoint_jh_count, 0, GFP_KERNEL))
> +	err = register_shrinker(&journal->j_shrinker, "jbd2-journal:(%u:%u)",
> +				MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
> +	if (err)
>  		goto err_cleanup;
>  
> -	if (register_shrinker(&journal->j_shrinker, "jbd2-journal:(%u:%u)",
> -			      MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev))) {
> -		percpu_counter_destroy(&journal->j_checkpoint_jh_count);
> -		goto err_cleanup;
> -	}
>  	return journal;
>  
>  err_cleanup:
> -	brelse(journal->j_sb_buffer);
> +	percpu_counter_destroy(&journal->j_checkpoint_jh_count);
>  	kfree(journal->j_wbuf);
>  	jbd2_journal_destroy_revoke(journal);
> +	journal_fail_superblock(journal);
>  	kfree(journal);
>  	return NULL;
>  }
> -- 
> 2.39.2
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR