linux-ext4 - difference between xip and o

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Date:	Thu, 5 Dec 2013 17:47:52 -0500
From:	jon ernst <jonernst07@...il.com>
To:	"linux-ext4@...r.kernel.org List" <linux-ext4@...r.kernel.org>
Subject: difference between xip and o_direct.

Hi,
I am trying to understand difference between xip and o_direct.

For XIP, document xip.txt says
"instead of keeping
data in the page cache, the need to have a page cache copy is eliminated
completely. With execute-in-place, read&write type operations are performed
directly from/to the memory backed storage device."

For O_Direct,

" File I/O is done directly to/from user-
space buffers.  " from manual of open(2)

So, are those 2 trying to do the same thing ? The difference I can
tell is, XIP option can be used when mounting fs. O_Direct is used in
open system-call.
Can anybody kindly teach me what are other differences?

thank you!

Jon
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