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