This optimisation data=journal isn't working right, because journalled-data
pages are not marked dirty when they are dirty against the journal.  Hence
I_DIRTY_PAGES doesn't get set hence we can fail to sync the file under some
circumstances.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>