writeback: remove wb_list
The wb_list member of struct backing_device_info always has exactly one
element. Just use the direct bdi->wb pointer instead and simplify some
code.
Also remove bdi_task_init which is now trivial to prepare for the next
patch.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index d5be169..d67989b 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -73,9 +73,9 @@
* If the default thread isn't there, make sure we add it. When
* it gets created and wakes up, we'll run this work.
*/
- if (unlikely(list_empty_careful(&bdi->wb_list)))
+ if (unlikely(!bdi->wb.task)) {
wake_up_process(default_backing_dev_info.wb.task);
- else {
+ } else {
struct bdi_writeback *wb = &bdi->wb;
if (wb->task)