linux-kernel - Re: Review status (Re: [PATCH] LogFS take three)

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Date:	Wed, 23 May 2007 17:14:04 +0200
From:	Jörn Engel <joern@...ybastard.org>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org, akpm@...l.org,
	Albert Cahalan <acahalan@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Greg KH <greg@...ah.com>, Ingo Oeser <ioe-lkml@...eria.de>
Subject: Re: Review status (Re: [PATCH] LogFS take three)

On Wed, 23 May 2007 19:07:32 +0400, Evgeniy Polyakov wrote:
> On Wed, May 23, 2007 at 02:58:41PM +0200, Jörn Engel (joern@...ybastard.org) wrote:
> > On Sun, 20 May 2007 21:30:52 +0400, Evgeniy Polyakov wrote:
> 
> And what if it is 33 bits? Or it is not allowed?

Not allowed.  Both number and size of segments may never exceed 32bit.

> > > segsize is long, but should be u64 I think.
> > 
> > It could be s32 as well.
> 
> It is a matter of definition - if segment size is allowed to be more
> than 32 bits, then below transformation is not correct, otherwise
> segment size should not use additional 32bits on 64bit platform, since
> it is long.

I guess I could save 4 Bytes there.

> > I'm just a German.  Forgive me if I drink lesser beverages.
> 
> You should definitely change that.

Change being German?  Not a bad idea, actually.

> Btw, what about this piece:
> 
> int logfs_erase_segment(struct super_block *sb, u32 index)
> {
> 	struct logfs_super *super = LOGFS_SUPER(sb);
> 
> 	super->s_gec++;
> 
> 	return mtderase(sb, index << super->s_segshift, super->s_segsize);
> }
> 
> index << super->s_segshift might overflow, mtderase expects loff_t
> there, since index can be arbitrary segment number, is it possible, that
> overflow really occurs?

Indeed it is.  You just earned your second beer^Wvodka.

Jörn

-- 
The wise man seeks everything in himself; the ignorant man tries to get
everything from somebody else.
-- unknown
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