linux-ext4 - Re: [PATCH] ext4 : Remove redundant condition in ext4_free_blocks

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Message-ID: <ea11fea30805312330s48dadc55x442dfc3e5f40b046@mail.gmail.com>
Date:	Sun, 1 Jun 2008 12:00:02 +0530
From:	"Manish Katiyar" <mkatiyar@...il.com>
To:	"Kari Hurtta" <hurtta+gmane@...lo.fmi.fi>
Cc:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] ext4 : Remove redundant condition in ext4_free_blocks_sb()

On Sun, Jun 1, 2008 at 11:55 AM, Kari Hurtta <hurtta+gmane@...lo.fmi.fi> wrote:
> "Manish Katiyar" <mkatiyar@...il.com> writes in
> gmane.linux.file-systems:
>
>> For two unsigned values the check "block+count < block"  is always
>> false. Thus the below patch removes that condition.
>>
>> =============================================================
>>
>> Signed-off-by: Manish Katiyar <mkatiyar@...il.com>
>>
>> --- a/fs/ext4/balloc.c  2008-05-18 18:07:45.000000000 +0530
>> +++ b/fs/ext4/balloc.c  2008-06-01 00:05:48.000000000 +0530
>> @@ -619,7 +619,6 @@
>>         sbi = EXT4_SB(sb);
>>         es = sbi->s_es;
>>         if (block < le32_to_cpu(es->s_first_data_block) ||
>> -           block + count < block ||
>>             block + count > ext4_blocks_count(es)) {
>>                 ext4_error (sb, "ext4_free_blocks",
>>                             "Freeing blocks not in datazone - "
>>
>>
>> =============================================================
>
> Hmm. Consider situation where   block + count > max unsigned value
>     mathematically
>
>     in that case
>           block + count < block
>     expression may be true

Yeah.... my bad..... Al Viro pointed it out. Sorry for that


>
>
>> --
>> Thanks & Regards,
>> ********************************************
>> Manish Katiyar ( http://mkatiyar.googlepages.com )
>> 3rd Floor, Fair Winds Block
>> EGL Software Park
>> Off Intermediate Ring Road
>> Bangalore 560071, India
>> ***********************************************
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
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>
> / Kari Hurtta
>
> --
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-- 
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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