From: Benjamin LaHaise <bcrl@redhat.com>
To: Joel Becker <Joel.Becker@oracle.com>
Cc: Rob van Nieuwkerk <robn@verdi.et.tudelft.nl>,
linux-kernel@vger.kernel.org
Subject: Re: O_DIRECT alignment requirements ?
Date: Wed, 9 Apr 2003 14:08:32 -0400 [thread overview]
Message-ID: <20030409140832.A4621@redhat.com> (raw)
In-Reply-To: <20030409154836.GA31739@ca-server1.us.oracle.com>; from Joel.Becker@oracle.com on Wed, Apr 09, 2003 at 08:48:36AM -0700
On Wed, Apr 09, 2003 at 08:48:36AM -0700, Joel Becker wrote:
> In 2.5, the alignment restrictions have been relaxed. Your
> offset, buffer, and transfer size must all be aligned on the hardware
> sector size. That is the output of BLKSSZGET against the block device,
> and is also what get_hardsect_size() returns in the kernel. For almost
> all disks this number is 512b, so you can do O_DIRECT on 512b alignment
> for a raw disk or for an ext3 filesystem. About the only thing that
> may not have a 512b hardware sector size is a CD-ROM.
Well, and SCSI devices configured to use 528 byte sectors and such...
-ben
--
Junk email? <a href="mailto:aart@kvack.org">aart@kvack.org</a>
prev parent reply other threads:[~2003-04-09 17:56 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-09 12:16 O_DIRECT alignment requirements ? Rob van Nieuwkerk
2003-04-09 15:48 ` Joel Becker
2003-04-09 16:53 ` Rob van Nieuwkerk
2003-04-09 17:59 ` Joel Becker
2003-04-09 19:15 ` Andrew Morton
2003-04-09 21:09 ` Rob van Nieuwkerk
2003-04-09 23:27 ` Joel Becker
2003-04-10 16:33 ` Rob van Nieuwkerk
2003-04-09 18:08 ` Benjamin LaHaise [this message]
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