From 6f3af01cb0eda0ec50fe1e4cbdf028269dc396fe Mon Sep 17 00:00:00 2001
From: Takahiro Yasui <tyasui@redhat.com>
Date: Tue, 6 Jan 2009 03:04:59 +0000
Subject: [PATCH] dm log: avoid reinitialising io_req on every operation

rw_header function updates three members of io_req data every time
when I/O is processed. bi_rw and notify.fn are never modified once
they get initialized, and so they can be set in advance.

header_to_disk() can also be pulled out of write_header() since only one
caller needs it and write_header() can be replaced by rw_header()
directly.

Signed-off-by: Takahiro Yasui <tyasui@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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