writeback: switch wakeup_flusher_threads() to cyclic writeback

We're writing back the full range of dirty pages on the devices,
there's no point in making this special and not do normal range
cyclic writeback.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 file changed