linux-ext4 - Re: [PATCH] ext2 : Remove redundant condition in ext2_free

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Message-ID: <919fe2b30806030533yce91ceds67b942f3adf88afb@mail.gmail.com>
Date:	Tue, 3 Jun 2008 08:33:20 -0400
From:	"Mark Asselstine" <asselsm@...il.com>
To:	"Manish Katiyar" <mkatiyar@...il.com>
Cc:	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] ext2 : Remove redundant condition in ext2_free_blocks()

On Sat, May 31, 2008 at 2:56 PM, Manish Katiyar <mkatiyar@...il.com> wrote:
> For two unsigned values the check "block+count < block"  is always
> false. Thus the below patch removes that condition.
>
Always? What about "ULONG_MAX + 5"? I believe the answer is 4, but I
may be wrong. You might want to rethink this one.

RE/
Mark

> =============================================================
>
> Signed-off-by: Manish Katiyar <mkatiyar@...il.com>
>
> --- a/fs/ext2/balloc.c  2008-05-11 23:54:40.000000000 +0530
> +++ b/fs/ext2/balloc.c  2008-06-01 00:03:44.000000000 +0530
> @@ -499,7 +499,6 @@
>        unsigned freed = 0, group_freed;
>
>        if (block < le32_to_cpu(es->s_first_data_block) ||
> -           block + count < block ||
>            block + count > le32_to_cpu(es->s_blocks_count)) {
>                ext2_error (sb, "ext2_free_blocks",
>                            "Freeing blocks not in datazone - "
>
>
> =============================================================
>
> --
> Thanks & Regards,
> ********************************************
> Manish Katiyar ( http://mkatiyar.googlepages.com )
> 3rd Floor, Fair Winds Block
> EGL Software Park
> Off Intermediate Ring Road
> Bangalore 560071, India
> ***********************************************
> --
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