writeback: make wakeup_dirtytime_writeback() handle multiple bdi_writeback's (001fe6f6) · Commits · 戴 / test

wakeup_dirtytime_writeback() currently only starts writeback on the root wb (bdi_writeback). For cgroup writeback support, update the function to check all wbs. Signed-off-by:

Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Jan Kara <jack@suse.cz> Cc: Theodore Ts'o <tytso@mit.edu> Signed-off-by:

Jens Axboe <axboe@fb.com>

fs/fs-writeback.c

+6 −3

Original line number	Original line	Diff line number	Diff line
	@@ -1260,8 +1260,11 @@ static void wakeup_dirtytime_writeback(struct work_struct *w)

	rcu_read_lock();		rcu_read_lock();
	list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) {		list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) {
	if (list_empty(&bdi->wb.b_dirty_time))		struct bdi_writeback *wb;
	continue;		struct wb_iter iter;

			bdi_for_each_wb(wb, bdi, &iter, 0)
			if (!list_empty(&bdi->wb.b_dirty_time))
	wb_wakeup(&bdi->wb);		wb_wakeup(&bdi->wb);
	}		}
	rcu_read_unlock();		rcu_read_unlock();

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