linux-kernel - Re: [PATCH -next v4 3/3] ext4: simplify read_mmp

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Date:   Tue, 19 Oct 2021 15:49:52 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ye Bin <yebin10@...wei.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        jack@...e.cz
Subject: Re: [PATCH -next v4 3/3] ext4: simplify read_mmp_block fucntion

On Tue 19-10-21 20:39:31, Ye Bin wrote:
> This patch is according to Jan Kara's suggestion:
> I guess I would just get rid of sb_getblk() in read_mmp_block() and always
> expect valid bh passed. The only place that passes NULL bh after this
> patch is one case in ext4_multi_mount_protect() and that can call
> sb_getblk() on its own. That way we can also simplify read_mmp_block()
> prototype to:
> 
> static int read_mmp_block(struct super_block *sb, struct buffer_head *bh);
> 
> Signed-off-by: Ye Bin <yebin10@...wei.com>
> Reviewed-by: Jan Kara <jack@...e.cz>

...

> @@ -289,7 +279,11 @@ int ext4_multi_mount_protect(struct super_block *sb,
>  		goto failed;
>  	}
>  
> -	retval = read_mmp_block(sb, &bh, mmp_block);
> +	bh = sb_getblk(sb, mmp_block);
> +	if (bh)
	^^^^^^

!bh here, please.

								Honza

-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR