linux-kernel - The difference of request dir between AS and Deadline I/O scheduler?

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Date:	Mon, 2 Mar 2009 13:06:57 +0800
From:	谢纲 <xiegang112@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: The difference of request dir between AS and Deadline I/O scheduler?

Hi,

I'm little confused about the defination of request dir in AS and
Deadline I/O scheduler.
In AS, the request dir is defined by wheher it's sync:

data_dir = rq_is_sync(rq);

But in Deadline, the requests are grouped by read and write.

Why is there the difference since AS is an extension of Deadline?
what's the consideration?

Thanks,

-- 
Xie Gang
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