linux-ext4 - Re: [PATCH 1/4] ext4: remove unsafe and unnecessary memset()

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Date:	Fri, 30 Nov 2012 15:04:59 +0100 (CET)
From:	Lukáš Czerner <lczerner@...hat.com>
To:	Lukáš Czerner <lczerner@...hat.com>
cc:	Guo Chao <yan@...ux.vnet.ibm.com>, tytso@....edu,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/4] ext4: remove unsafe and unnecessary memset()

On Fri, 30 Nov 2012, Lukáš Czerner wrote:

> Date: Fri, 30 Nov 2012 14:20:42 +0100 (CET)
> From: Lukáš Czerner <lczerner@...hat.com>
> To: Guo Chao <yan@...ux.vnet.ibm.com>
> Cc: tytso@....edu, linux-ext4@...r.kernel.org
> Subject: Re: [PATCH 1/4] ext4: remove unsafe and unnecessary memset()
> 
> On Fri, 30 Nov 2012, Guo Chao wrote:
> 
> > Date: Fri, 30 Nov 2012 14:41:43 +0800
> > From: Guo Chao <yan@...ux.vnet.ibm.com>
> > To: tytso@....edu
> > Cc: linux-ext4@...r.kernel.org
> > Subject: [PATCH 1/4] ext4: remove unsafe and unnecessary memset()
> > 
> > We memset this page before checking whether it's valid. But we need
> > not memset zeroed page at all.
> > 
> > Signed-off-by: Guo Chao <yan@...ux.vnet.ibm.com>
> > ---
> >  fs/ext4/super.c |    1 -
> >  1 file changed, 1 deletion(-)
> > 
> > diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> > index ad6cd8a..66a4e20 100644
> > --- a/fs/ext4/super.c
> > +++ b/fs/ext4/super.c
> > @@ -3206,7 +3206,6 @@ int ext4_calculate_overhead(struct super_block *sb)
> >  	ext4_fsblk_t overhead = 0;
> >  	char *buf = (char *) get_zeroed_page(GFP_KERNEL);
> >  
> > -	memset(buf, 0, PAGE_SIZE);
> >  	if (!buf)
> >  		return -ENOMEM;
> 
> Good catch, thanks!
> 
> Reviewed-by: Lukas Czerner <lczerner@...hat.com>

It looks like that it has been already fixed with a different patch.

http://www.spinics.net/lists/linux-ext4/msg35310.html

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