linux-ext4 - Re: Creating a >32bit blocks filesystem.

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Message-ID: <20070509161510.GL6375@schatzie.adilger.int>
Date:	Wed, 9 May 2007 09:15:10 -0700
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Valerie Clement <valerie.clement@...l.net>
Cc:	"Jose R. Santos" <jrs@...ibm.com>, linux-ext4@...r.kernel.org
Subject: Re: Creating a >32bit blocks filesystem.

On May 09, 2007  16:57 +0200, Valerie Clement wrote:
> Jose R. Santos wrote:
> >I think this has more to do with the fact that I'm on a 32bit
> >architecture and there are still a couple places where blocks are
> >represented using "unsigned long".  I'm trying to get access to a 64bit
> >arch to confirm this.

> Oh, I didn't catch that you use a 32-bit system.
> On 32-bit architectures, the page cache index size imposes a 16TB limit 
> on the filesystem size (with 4KB blocksize). So you need a 64-bit system 
> for your test.

The mke2fs code should warn the user in this case that the filesystem will
not be usable on 32-bit systems.  I believe mke2fs already checks PAGE_SIZE
in order to validate blocksize > 4096 filesystem requests, and a simple
check for "sizeof(long)" to see if it is a 32-bit system would be enough.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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