linux-kernel - Re: Cannot partition 32GB disk on a 32bit machine (correct version of the patch this time)

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Message-Id: <20140619135145.9fb9f65404028d656b3f8ec5@linux-foundation.org>
Date:	Thu, 19 Jun 2014 13:51:45 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	James Bottomley <James.Bottomley@...senpartnership.com>
Cc:	"Cox, Alan" <alan.cox@...el.com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"aeb@....nl" <aeb@....nl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: Cannot partition 32GB disk on a 32bit machine (correct version
 of the patch this time)

On Thu, 19 Jun 2014 11:43:57 -0700 James Bottomley <James.Bottomley@...senpartnership.com> wrote:

> Do you have CONFIG_LBD turned on?  That's supposed to let us go up to
> about 16TB before we run out of page index bits.  If you do, we might
> have a variable that's int but should be sector_t somewhere.

I assume the problem is that iov_iter uses size_t (which is 32-bit on
32-bit) and we're trying to use iov_iter for blockdevs.

All this code is new and I've NFI how it's supposed to work and cannot
find a description anywhere.

cc's viro and runs away.
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