linux-kernel - Re: [PATCH -next] ext4: fix miss release buffer head in ext4_fc_write

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Date:   Wed, 14 Sep 2022 16:37:56 +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] ext4: fix miss release buffer head in
 ext4_fc_write_inode

On Wed 14-09-22 18:08:59, Ye Bin wrote:
> In 'ext4_fc_write_inode' function first call 'ext4_get_inode_loc' get 'iloc',
> after use it miss release 'iloc.bh'.
> So just release 'iloc.bh' before 'ext4_fc_write_inode' return.
> 
> Signed-off-by: Ye Bin <yebin10@...wei.com>

Yes, nice. Feel free to add:

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

								Honza

> ---
>  fs/ext4/fast_commit.c | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
> index 2af962cbb835..b7414a5812f6 100644
> --- a/fs/ext4/fast_commit.c
> +++ b/fs/ext4/fast_commit.c
> @@ -874,22 +874,25 @@ static int ext4_fc_write_inode(struct inode *inode, u32 *crc)
>  	tl.fc_tag = cpu_to_le16(EXT4_FC_TAG_INODE);
>  	tl.fc_len = cpu_to_le16(inode_len + sizeof(fc_inode.fc_ino));
>  
> +	ret = -ECANCELED;
>  	dst = ext4_fc_reserve_space(inode->i_sb,
>  			sizeof(tl) + inode_len + sizeof(fc_inode.fc_ino), crc);
>  	if (!dst)
> -		return -ECANCELED;
> +		goto err;
>  
>  	if (!ext4_fc_memcpy(inode->i_sb, dst, &tl, sizeof(tl), crc))
> -		return -ECANCELED;
> +		goto err;
>  	dst += sizeof(tl);
>  	if (!ext4_fc_memcpy(inode->i_sb, dst, &fc_inode, sizeof(fc_inode), crc))
> -		return -ECANCELED;
> +		goto err;
>  	dst += sizeof(fc_inode);
>  	if (!ext4_fc_memcpy(inode->i_sb, dst, (u8 *)ext4_raw_inode(&iloc),
>  					inode_len, crc))
> -		return -ECANCELED;
> -
> -	return 0;
> +		goto err;
> +	ret = 0;
> +err:
> +	brelse(iloc.bh);
> +	return ret;
>  }
>  
>  /*
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR