linux-kernel - Re: [PATCH -next v3 3/5] ext4: get buffer head before read_mmp

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Date:   Tue, 19 Oct 2021 11:12:16 +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 v3 3/5] ext4: get buffer head before read_mmp_block

On Tue 19-10-21 14:49:57, Ye Bin wrote:
> There is only pass NULL 'bh' in ext4_multi_mount_protect,
> So just call sb_getblk get buffer head fisrt, and we will
> simplify read_mmp_block function.
> 
> Signed-off-by: Ye Bin <yebin10@...wei.com>

I don't think there's a need to separate this into a special patch. Just
fold this change into patch 4. With that feel free to add:

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

The combined change looks good to me.

								Honza

> ---
>  fs/ext4/mmp.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c
> index 4af8b99ade84..6ac6aacd8fa5 100644
> --- a/fs/ext4/mmp.c
> +++ b/fs/ext4/mmp.c
> @@ -295,6 +295,10 @@ int ext4_multi_mount_protect(struct super_block *sb,
>  		goto failed;
>  	}
>  
> +	bh = sb_getblk(sb, mmp_block);
> +	if (bh)
> +		goto failed;
> +
>  	retval = read_mmp_block(sb, &bh, mmp_block);
>  	if (retval)
>  		goto failed;
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR