linux-kernel - Re: Libata PATA status

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Date:	Thu, 05 Jul 2007 19:25:08 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Libata PATA status

Andi Kleen wrote:
> My personal wish list feature would be a little forwarder driver
> to forward /dev/hd* to /dev/sd* for this; then old IDE could be
> disabled without risking breaking old root file systems.

That's on the long-term TODO list.

libata is moving towards making libata-scsi an optional module (will 
always be around for ATAPI, and for compat with current ATA), and 
driving ATA disks as a native block driver, rather than having SCSI do 
the work for us.

libata's qc_issue/qc_complete high level API and internal modularity 
were designed to make this possible.  It is easy to see in the current 
code how libata-scsi is merely a user of the qc_issue/qc_complete API, 
with all the low-level details isolated away from that module.

Addendum:  Remember too, /dev/hdX is not just a major/minor pair, but a 
userspace interface, complete with expected ioctl support.

	Jeff

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