linux-kernel - Re: [PATCH 7/7] jbd2: remove unneeded check of ret in jbd2_fc_get

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Message-ID: <a5da8406-ed52-b71f-4766-a16e8d175496@huaweicloud.com>
Date: Wed, 31 Jul 2024 14:17:24 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: Kemeng Shi <shikemeng@...weicloud.com>
Cc: linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org, tytso@....edu,
 jack@...e.com
Subject: Re: [PATCH 7/7] jbd2: remove unneeded check of ret in jbd2_fc_get_buf

On 2024/7/30 19:33, Kemeng Shi wrote:
> Simply return -EINVAL if j_fc_off is invalid to avoid repeated check of
> ret.
> 
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
> ---
>  fs/jbd2/journal.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index dc18b9f7c999..6f90f7b8e9e5 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -842,12 +842,8 @@ int jbd2_fc_get_buf(journal_t *journal, struct buffer_head **bh_out)
>  		fc_off = journal->j_fc_off;
>  		blocknr = journal->j_fc_first + fc_off;
>  		journal->j_fc_off++;
> -	} else {
> -		ret = -EINVAL;
> -	}
> -
> -	if (ret)
> -		return ret;
> +	} else
> +		return -EINVAL;
>  

I'd like this style, just a suggestion.

	if (journal->j_fc_off + journal->j_fc_first >= journal->j_fc_last)
		return -EINVAL;

	fc_off = journal->j_fc_off;
	blocknr = journal->j_fc_first + fc_off;
	journal->j_fc_off++;

	...

Thanks,
Yi.


>  	ret = jbd2_journal_bmap(journal, blocknr, &pblock);
>  	if (ret)
>