---

yaml
---
r: 196831
b: refs/heads/master
c: 69b62d0
h: refs/heads/master
i:
  196829: 2c465b6
  196827: 3fa3730
  196823: 956ff74
  196815: 787accd
  196799: 7ab7562
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 2395e463fefd4aa8b784787e926e9b84e216d14f
+refs/heads/master: 69b62d01ec44fe0d505d89917392347732135a4d

trunk/fs/fs-writeback.c

@@ -852,6 +852,12 @@ static long wb_check_old_data_flush(struct bdi_writeback *wb)
 	unsigned long expired;
 	long nr_pages;
 
+	/*
+	 * When set to zero, disable periodic writeback
+	 */
+	if (!dirty_writeback_interval)
+		return 0;
+
 	expired = wb->last_old_flush +
 			msecs_to_jiffies(dirty_writeback_interval * 10);
 	if (time_before(jiffies, expired))
@@ -947,8 +953,12 @@ int bdi_writeback_task(struct bdi_writeback *wb)
 				break;
 		}
 
-		wait_jiffies = msecs_to_jiffies(dirty_writeback_interval * 10);
-		schedule_timeout_interruptible(wait_jiffies);
+		if (dirty_writeback_interval) {
+			wait_jiffies = msecs_to_jiffies(dirty_writeback_interval * 10);
+			schedule_timeout_interruptible(wait_jiffies);
+		} else
+			schedule();
+
 		try_to_freeze();
 	}