linux-ext4 - Re: [PATCH 2/2] Ext3: remove a useless check for the function ext3_free_blocks

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Date:	Sun, 27 Jan 2013 00:40:42 -0700
From:	Andreas Dilger <adilger@...ger.ca>
To:	Wang Shilong <wangshilong1991@...il.com>
Cc:	"jack@...e.cz" <jack@...e.cz>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 2/2] Ext3: remove a useless check for the function ext3_free_blocks_sb

On 2011-01-26, at 15:48, Wang Shilong <wangshilong1991@...il.com> wrote:

> From: Wang Shilong <wangsl-fnst@...fujitsu.com>
> 
> Because 'block + count < block' always comes to false, it is useless
> to have this check, just remove it.

This check can be true if the sum overflows the 32-bit variable it is stored in, so it is not useless...

Cheers, Andreas

> Signed-off-by: Wang Shilong <wangsl-fnst@...fujitsu.com>
> ---
> fs/ext3/balloc.c | 1 -
> 1 file changed, 1 deletion(-)
> 
> diff --git a/fs/ext3/balloc.c b/fs/ext3/balloc.c
> index 22548f5..c557f22 100644
> --- a/fs/ext3/balloc.c
> +++ b/fs/ext3/balloc.c
> @@ -507,7 +507,6 @@ void ext3_free_blocks_sb(handle_t *handle, struct super_block *sb,
>    sbi = EXT3_SB(sb);
>    es = sbi->s_es;
>    if (block < le32_to_cpu(es->s_first_data_block) ||
> -        block + count < block ||
>        block + count > le32_to_cpu(es->s_blocks_count)) {
>        ext3_error (sb, "ext3_free_blocks",
>                "Freeing blocks not in datazone - "
> -- 1.7.11.7
> 
> --
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