linux-kernel - Can I/O order be guaranteed by submitting sycn bio

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Message-ID: <d364733c0905081925y795fefc3ie76515609c95cf3e@mail.gmail.com>
Date:	Sat, 9 May 2009 10:25:29 +0800
From:	谢纲 <xiegang112@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Can I/O order be guaranteed by submitting sycn bio

Hi,

Some journal file systems submits sycn bio to do ordered write  if the
device does not support barrier i/o. But the sync bio only implies the
unplug of the request queue. Some elevators may reorder the request.
It's seems that the bio only with BIO_RW_SYNC flag could not guarantee
the write order. Is this true?

If so, is there any better way to do ordered write when there is no
barrier i/o support.

Thanks,

-- 
Xie Gang
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