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

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Message-ID: <1403221447.1962.24.camel@jarvis.lan>
Date:	Thu, 19 Jun 2014 16:44:07 -0700
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Alan Cox <alan@...ux.intel.com>
Cc:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"aeb@....nl" <aeb@....nl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Cannot partition 32GB disk on a 32bit machine (correct version
 of the patch this time)

On Fri, 2014-06-20 at 00:04 +0100, Alan Cox wrote:
> > Wow that's junk issued by an Exchange server ... Alan, really ...
> 
> Blame evolution. It apparently thinks that if you follow up to your own
> email from one address it should randomly switch to another.

so you @linux.intel.com is sane and you @intel.com is exchange ...

> > 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.
> 
> LBDAF is set

OK, so as Andrew said, it looks like Viro's conversion from aio to
iterators has a length and offset problem on 32 bits.

my suspicion is that iov_offset and count in struct iov_iter have to
become loff_t quantities ... plus a lot of other size_t to loff_t
conversions.  Hopefully Viro will fix it as a matter of urgency.

James


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