writeback: make bdi_start_background_writeback() take bdi_writeback instead of backing_dev_info
bdi_start_background_writeback() currently takes @bdi and kicks the
root wb (bdi_writeback). In preparation for cgroup writeback support,
make it take wb instead.
This patch doesn't make any functional difference.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index e3b5c1d..70cf98d 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1456,7 +1456,7 @@
}
if (unlikely(!writeback_in_progress(wb)))
- bdi_start_background_writeback(bdi);
+ wb_start_background_writeback(wb);
if (!strictlimit)
wb_dirty_limits(wb, dirty_thresh, background_thresh,
@@ -1588,7 +1588,7 @@
return;
if (nr_reclaimable > background_thresh)
- bdi_start_background_writeback(bdi);
+ wb_start_background_writeback(wb);
}
static DEFINE_PER_CPU(int, bdp_ratelimits);