We shouldn't use WB_SYNC_ALL if the caller is asking for asynchronous
treatment.
Signed-off-by: NMike Galbraith <efault@gmx.de>
Acked-by: NJan Kara <jack@suse.cz>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>