linux-kernel - Re: [PATCH] Btrfs: Remove useless condition

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Message-ID: <AANLkTinPWd2bavC_44WkEL++KXirZ1CW3dTNK7G-Oag=@mail.gmail.com>
Date:	Sun, 12 Sep 2010 19:26:10 +0530
From:	Jaswinder Singh Rajput <jaswinderlinux@...il.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Chris Mason <chris.mason@...cle.com>, linux-btrfs@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Btrfs: Remove useless condition

Hello,

On Sun, Sep 12, 2010 at 5:59 PM, Johannes Weiner <hannes@...xchg.org> wrote:
> On Sun, Sep 12, 2010 at 04:32:20PM +0530, Jaswinder Singh Rajput wrote:
>>
>> if (ret) is useless as it will be never NULL as in previous statement
>> we are setting ret = prev for !ret
>
> If there is no match and no extent below the given file offset, `prev'
> will be NULL as well, no?
>
> So the check is not useless, it prevents throwing out a cached success
> in case of a lookup failure.
>

Got it !!

Thanks,
--
Jaswinder Singh.
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