linux-kernel - O_DIRECT question

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Message-ID: <6d6a94c50701101857v2af1e097xde69e592135e54ae@mail.gmail.com>
Date:	Thu, 11 Jan 2007 10:57:06 +0800
From:	Aubrey <aubreylee@...il.com>
To:	"Hua Zhong" <hzhong@...il.com>
Cc:	"Hugh Dickins" <hugh@...itas.com>, linux-kernel@...r.kernel.org,
	hch@...radead.org, kenneth.w.chen@...el.com, akpm@...l.org,
	torvalds@...l.org, mjt@....msk.ru
Subject: O_DIRECT question

Hi all,

Opening file with O_DIRECT flag can do the un-buffered read/write access.
So if I need un-buffered access, I have to change all of my
applications to add this flag. What's more, Some scripts like "cp
oldfile newfile" still use pagecache and buffer.
Now, my question is, is there a existing way to mount a filesystem
with O_DIRECT flag? so that I don't need to change anything in my
system. If there is no option so far, What is the right way to achieve
my purpose?

Thanks a lot.
-Aubrey
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