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

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Message-ID: <20080704000010.08db5daf@lxorguk.ukuu.org.uk>
Date:	Fri, 4 Jul 2008 00:00:10 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Mikulas Patocka <mpatocka@...hat.com>
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

> SCSI. Even the NCQ commands are done via IDE registers, not SCSI command 
> block. It seems like someone wanted to save few weeks of coding by reusing 

Thats really a trivial question of encoding, in all but actual
byte encoding it is SCSI. Once you look at SAS and ATAPI it's all the
more clear.

> the SCSI disk queuing ... and created a lot of other problems (example: if 
> you have disk error with IDE driver, it dumps IDE registers into log ... 
> if you have disk error with SATA driver, it dumps sense key ... but 

Actually it dumps both - and that behaviour was chosen to match existing
drivers in a large part (eg 3ware). 
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