Original computation forgets to count writes of indirect block themselves
(it only counts with blocks necessary for their allocation) in ordered mode.
Acked-by: NAmir Goldstein <amir73il@users.sf.net>
Signed-off-by: NYongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: NJan Kara <jack@suse.cz>