linux-kernel - Re: [PATCH 5/5] falconide/q40ide: add ->atapi_*put_bytes and ->ata_*put

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Date:	Mon, 31 Mar 2008 22:41:06 +0100
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-ide@...r.kernel.org,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Linux/m68k <linux-m68k@...r.kernel.org>,
	Michael Schmitz <schmitz@...ian.org>
Subject: Re: [PATCH 5/5] falconide/q40ide: add ->atapi_*put_bytes and ->ata_*put_data methods

Hi,

On Monday 31. March 2008, Alan Cox wrote:

> > Yes, the data on the disk is stored byte-swapped.
> > So it's only the drive ID and packet commands that should be swapped.
>
> If you are storing the data on disk byte swapped then reverse the logic
> in the driver so you don't need hacks for un-swapping commands and write
> a bytesewap device mapper layer in the right place. Then you can even
> move disks around.

That would require an additional data copy and a double byteswap on machines 
which are not that fast in first place...

bye, Roman
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