We see dirty inodes there occasionally, so better be safe and write them
out.
Signed-off-by: Jens Axboe <jens.axboe@xxxxxxxxxx>
---
fs/fs-writeback.c | 2 +-
include/linux/writeback.h | 1 +
mm/backing-dev.c | 8 ++++++--
3 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 8e0902e..e4f96b9 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -432,7 +432,7 @@ static void wb_writeback(struct bdi_writeback *wb)
* This will be inlined in bdi_writeback_task() once we get rid of any
* dirty inodes on the default_backing_dev_info
*/
-static void wb_do_writeback(struct bdi_writeback *wb)
+void wb_do_writeback(struct bdi_writeback *wb)
{
/*
* We get here in two cases:
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index baf04a9..e414702 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -69,6 +69,7 @@ void writeback_inodes(struct writeback_control *wbc);
int inode_wait(void *);
void sync_inodes_sb(struct super_block *, int wait);
void sync_inodes(int wait);
+void wb_do_writeback(struct bdi_writeback *wb);
/* writeback.h requires fs.h; it, too, is not included from here. */
static inline void wait_on_inode(struct inode *inode)
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 57e44e3..977c171 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -396,8 +396,8 @@ static int bdi_forker_task(void *ptr)
* Temporary measure, we want to make sure we don't see
* dirty data on the default backing_dev_info
*/
- if (wb_has_dirty_io(me))
- bdi_flush_io(me->bdi);
+ if (wb_has_dirty_io(me) || !list_empty(&me->bdi->work_list))
+ wb_do_writeback(me);
prepare_to_wait(&me->wait, &wait, TASK_INTERRUPTIBLE);
@@ -424,6 +424,10 @@ static int bdi_forker_task(void *ptr)
continue;
}
+ /*
+ * This is our real job - check for pending entries in
+ * bdi_pending_list, and create the tasks that got added
+ */
bdi = list_entry(bdi_pending_list.next, struct backing_dev_info,
bdi_list);
list_del_init(&bdi->bdi_list);
--
1.6.3.rc0.1.gf800
--
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