linux-ext4 - Re: [PATCH] ext2: add missing brelse in ext2_new

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Message-ID: <20191022082803.GE2436@quack2.suse.cz>
Date:   Tue, 22 Oct 2019 10:28:03 +0200
From:   Jan Kara <jack@...e.cz>
To:     Chengguang Xu <cgxu519@...ernel.net>
Cc:     jack@...e.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext2: add missing brelse in ext2_new_blocks()

On Tue 22-10-19 15:10:45, Chengguang Xu wrote:
> There is a missing brelse of bitmap_bh in the
> case of retry.
> 
> Signed-off-by: Chengguang Xu <cgxu519@...ernel.net>

Good catch but please add a comment explaining that 'bitmap_bh' may be
non-null because of retry. Thanks!

								Honza

> ---
>  fs/ext2/balloc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
> index 924c1c765306..e8eedad479a7 100644
> --- a/fs/ext2/balloc.c
> +++ b/fs/ext2/balloc.c
> @@ -1313,6 +1313,7 @@ ext2_fsblk_t ext2_new_blocks(struct inode *inode, ext2_fsblk_t goal,
>  	if (free_blocks > 0) {
>  		grp_target_blk = ((goal - le32_to_cpu(es->s_first_data_block)) %
>  				EXT2_BLOCKS_PER_GROUP(sb));
> +		brelse(bitmap_bh);
>  		bitmap_bh = read_block_bitmap(sb, group_no);
>  		if (!bitmap_bh)
>  			goto io_error;
> -- 
> 2.20.1
> 
> 
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR