writeback: bdi_writeback_task() must set task state before calling schedule()
Calling schedule without setting the task state to non-running will
return immediately, so ensure that we set it properly and check our
sleep conditions after doing so.
This is a fixup for commit 69b62d01.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 76f546d..437a743 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -978,8 +978,13 @@
if (dirty_writeback_interval) {
wait_jiffies = msecs_to_jiffies(dirty_writeback_interval * 10);
schedule_timeout_interruptible(wait_jiffies);
- } else
- schedule();
+ } else {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (list_empty_careful(&wb->bdi->work_list) &&
+ !kthread_should_stop())
+ schedule();
+ __set_current_state(TASK_RUNNING);
+ }
try_to_freeze();
}
