linux-kernel - What does "ordering by draining" mean?

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Message-ID: <4104961b0712100149h69b1e1fas355b770f93affd03@mail.gmail.com>
Date:	Mon, 10 Dec 2007 17:49:37 +0800
From:	"jidong xiao" <jidong.xiao@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: What does "ordering by draining" mean?

Hi,

I am reading the source code of block I/O layer, and now seeing there
saying "ordering by draining" or "ordering by tag" in
include/blkdev.h,and the comments in that file says: "Hardbarrier is
supported with one of the following methods", but what do these two
methods exactly mean?

Thanks

Regards
Jason
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