linux-ext4 - Re: [PATCH 5/5] libext2fs: avoid 32-bit overflow in ext2fs

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Message-ID: <20130116014914.GA20060@gmail.com>
Date:	Wed, 16 Jan 2013 09:49:14 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 5/5] libext2fs: avoid 32-bit overflow in
 ext2fs_initialize with a 512M cluster size

On Tue, Jan 15, 2013 at 02:10:30PM -0500, Theodore Ts'o wrote:
> On Tue, Jan 15, 2013 at 11:33:31PM +0800, Zheng Liu wrote:
> > 
> > FWIW, I wonder why we need to add such complex logical to handle a
> > corner case.  I guess no one wants to use a 512MB cluster.  So changing
> > max cluster size from 512MB to 256MB is very simple and straightfoward.
> 
> I agree that it seems very unlikely that there would be much interest
> in using a 512MB cluster.  However, we would still need to do the
> check in the case of a 16k block size (on an PowerPC or Itanium
> system) at a 256MB or 128MB cluster.  So part of this check would be
> needed anyway.

Yeah, I see.  Thanks for the explanation.

Regards,
                                                - Zheng
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