From: Jeff Garzik <jeff@garzik.org>
To: linux-ide@vger.kernel.org
Cc: "zhao, forrest" <forrest.zhao@intel.com>,
htejun@gmail.com, randy_dunlap <rdunlap@xenotime.net>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: [RFC] ATA host-protected area (HPA) device mapper?
Date: Thu, 08 Jun 2006 23:43:36 -0400 [thread overview]
Message-ID: <4488EE68.9000605@garzik.org> (raw)
In-Reply-To: <4488E6F6.10306@pobox.com>
As I just mentioned on linux-ide in another email:
libata should -- like drivers/ide -- call the ATA "set max" command to
fully address the hard drive, including the special "host-protected
area" (HPA). We should do this because the Linux standard is to export
the raw hardware directly, making 100% of the hardware capability
available to the user (and, in this case, Linux-based BIOS and recovery
tools).
However, there are rare bug reports and general paranoia related to
presenting 100% of the ATA hard drive "native" space, rather than the
possibly-smaller space that the BIOS chose to present to the user.
My thinking is that [someone] should create an optional, ATA-specific
device mapper module. This module would layer on top of an ATA block
device, and present two block devices: the BIOS-presented space, and
the HPA.
Such a module would make it trivial for users to ensure that partition
tables and RAID metadata formats know what the BIOS (rather than
underlying hard drive) considers to be end-of-disk.
Comments? Questions? Am I completely insane? ;-)
Jeff
next prev parent reply other threads:[~2006-06-09 3:43 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-08 7:30 [RFC] AHCI Command Completion Coalescing(CCC) proposal zhao, forrest
2006-06-08 15:01 ` Jeff Garzik
2006-06-09 2:27 ` zhao, forrest
2006-06-09 3:11 ` Another project for you... :) Jeff Garzik
2006-06-09 3:13 ` zhao, forrest
2006-06-09 22:29 ` Greg Freemyer
2006-06-09 23:44 ` Alan Cox
2006-06-09 3:43 ` Jeff Garzik [this message]
2006-06-09 4:51 ` [RFC] ATA host-protected area (HPA) device mapper? Matthew Frost
2006-06-14 8:01 ` Another project for you... :) zhao, forrest
2006-06-14 15:19 ` Randy.Dunlap
2006-06-15 7:59 ` zhao, forrest
2006-06-15 11:47 ` Jeff Garzik
2006-06-09 3:30 ` [RFC] AHCI Command Completion Coalescing(CCC) proposal Jeff Garzik
2006-06-09 3:39 ` zhao, forrest
2006-06-09 3:43 ` Tejun Heo
2006-06-09 3:47 ` Tejun Heo
2006-06-09 3:51 ` zhao, forrest
2006-06-09 4:12 ` Jeff Garzik
2006-06-09 5:24 ` Tejun Heo
2006-06-09 11:49 ` Jens Axboe
2006-06-09 3:53 ` Jeff Garzik
2006-06-09 3:52 ` Jeff Garzik
2006-06-09 11:49 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2006-06-09 10:47 [RFC] ATA host-protected area (HPA) device mapper? Etienne Lorrain
2006-06-09 14:48 ` Jeff Garzik
2006-06-09 17:22 ` Alan Cox
2006-06-10 11:56 ` Etienne Lorrain
2006-06-11 15:48 ` Arjan van de Ven
2006-06-13 10:00 ` Etienne Lorrain
2006-06-09 20:41 Etienne Lorrain
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