linux-ext4 - Re: [RFC PATCH] jbd2: no need to repeat in jbd2_journal_add_journal

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Date:   Wed, 29 Jan 2020 17:20:34 +0100
From:   Jan Kara <jack@...e.cz>
To:     Liu Song <fishland@...yun.com>
Cc:     tytso@....edu, jack@...e.com, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, liu.song11@....com.cn
Subject: Re: [RFC PATCH] jbd2: no need to repeat in
 jbd2_journal_add_journal_head

On Wed 29-01-20 17:57:00, Liu Song wrote:
> From: Liu Song <liu.song11@....com.cn>
> 
> In "journal_alloc_journal_head" use "GFP_NOFS | __GFP_NOFAIL"
> as the alloc flag, so it will retry until memory allocation
> is successful. Then we do not need to do extra repeat.
> 
> Signed-off-by: Liu Song <liu.song11@....com.cn>

Thanks for the patch. It looks good. You can add:

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

								Honza

> ---
>  fs/jbd2/journal.c | 6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index 5e408ee24a1a..1a9aaf07cecd 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -2503,7 +2503,6 @@ struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh)
>  	struct journal_head *jh;
>  	struct journal_head *new_jh = NULL;
>  
> -repeat:
>  	if (!buffer_jbd(bh))
>  		new_jh = journal_alloc_journal_head();
>  
> @@ -2515,11 +2514,6 @@ struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh)
>  			(atomic_read(&bh->b_count) > 0) ||
>  			(bh->b_page && bh->b_page->mapping));
>  
> -		if (!new_jh) {
> -			jbd_unlock_bh_journal_head(bh);
> -			goto repeat;
> -		}
> -
>  		jh = new_jh;
>  		new_jh = NULL;		/* We consumed it */
>  		set_buffer_jbd(bh);
> -- 
> 2.20.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR