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low level access path for xfs operation

To: linux-xfs@xxxxxxxxxxx
Subject: low level access path for xfs operation
From: Soon-Son Kwon <kss@xxxxxxxx>
Date: Fri, 21 Mar 2003 12:40:47 +0900
Organization: KLDP(Korean Linux Documentation Project)
Reply-to: kss@xxxxxxxx
Sender: linux-xfs-bounce@xxxxxxxxxxx
User-agent: Mutt/1.2.5i
Hi xfs folks:
Could anyone please let me know the following
xfs internal operation details?

I would like to know if there is any operation
that bypasses submit_bio() when accessing the 
lower level block devices.

I want to add some function whenever the filesystem
tries to modify any block and concluded that submit_bio()
seems to be the lowest entry point for such operations.

But I later found that I did not consider the direct i/o
or raw i/o operations that seems to have shorter path
for lower devices by eliminating the copy operations.
I suspect those direct i/o or raw i/o operations do not
use submit_bio().

If there is any mistake or missing point, 
please let me know.

Thanks very much.
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