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To: Matthew Wilcox <matthew@wil.cx>
Cc: Andreas Dilger <adilger@turbolinux.com>, LA Walsh <law@sgi.com>,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: 64-bit block sizes on 32-bit systems
In-Reply-To: <20010326181803.F31126@parcelfarce.linux.theplanet.co.uk> <200103261747.f2QHlEX19564@webber.adilger.int> <20010326190945.I31126@parcelfarce.linux.theplanet.co.uk>
From: ebiederm@xmission.com (Eric W. Biederman)
Date: 26 Mar 2001 11:37:52 -0700
In-Reply-To: Matthew Wilcox's message of "Mon, 26 Mar 2001 19:09:45 +0100"
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Matthew Wilcox <matthew@wil.cx> writes:

> On Mon, Mar 26, 2001 at 10:47:13AM -0700, Andreas Dilger wrote:
> > What do you mean by problems 5 years down the road?  The real issue is that
> > this 32-bit block count limit affects composite devices like MD RAID and
> > LVM today, not just individual disks.  There have been several postings
> > I have seen with people having a problem _today_ with a 2TB limit on
> > devices.
> 
> people who can afford 2TB of disc can afford to buy a 64-bit processor.

Currently that doesn't solve the problem as block_nr is held in an int.
And as gcc compiles an int to a 32bit number on a 64bit processor, the
problem still isn't solved.

That at least we need to address.

Eric
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