linux-kernel - REQ_HARDBARRIER and REQ

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Message-ID: <c9ad85600702240156g717d49cfm9c7ea30c00d48d28@mail.gmail.com>
Date:	Sat, 24 Feb 2007 03:56:34 -0600
From:	"V P" <upathiyayan@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: REQ_HARDBARRIER and REQ_SOFTBARRIER

Hi,

I'm trying to modify the ordering of I/O requests in Linux kernel, and
came across the barrier flags REQ_HARDBARRIER and REQ_SOFTBARRIER.

One thing I noticed (which might be wrong) is that all the requests
have both these flags set. What is the significance of these flags? Is
it a must for a request to have this? Can I reorder two requests with
these flags set? How is SOFTBARRIER different from HARDBARRIER?

I appreciate your time and help.

Thanks much.
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