alibaba/ali_kernel — pull request #72 by jesuszhu (2014-08-28 05:35:50+00:00)
Title: dm io: fix the sync/async helper

Without this patch they are actually the same thing since the changes
against the rw field does not get passed to the under level routines.

It seems like a mistake during rebase to RHEL 2.6.32-220.

Signed-off-by: Zhu Yanhai