linux-kernel - Re: [PATCH 1/2] Avoid bio

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Message-ID: <Pine.LNX.4.64.0807032324150.26730@engineering.redhat.com>
Date:	Thu, 3 Jul 2008 23:26:34 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Jens Axboe <jens.axboe@...cle.com>, linux-kernel@...r.kernel.org,
	Neil Brown <neilb@...e.de>
Subject: Re: [PATCH 1/2] Avoid bio_endio recursion

On Fri, 4 Jul 2008, Alan Cox wrote:

>
>> But not for SATA disks. The only thing SCSI and SATA disk have common is
>> that they may process concurrently more requests. There's nothing else.
>
> The only material difference between SATA and SCSI is the encoding of the
> command blocks and responses.
>
> Alan

That statement is true for any two block device protocol. Then, why 
doesn't Linux use SCSI for all block devices? --- add scsi command block 
to struct bio and we can pass them directly to controller driver :)

Mikulas
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