[PATCH 3/8] writeback: use WRITE_BG for kupdate and background writeback

[Jens Axboe]

If we're doing background type writes, then use the appropriate
write command for that.

Signed-off-by: Jens Axboe <axboe@xxxxxx>
---
 include/linux/writeback.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 78b87c517b5f..f12f0b34daca 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -104,6 +104,8 @@ static inline int wbc_to_write_flags(struct writeback_control *wbc)
 {
 	if (wbc->sync_mode == WB_SYNC_ALL)
 		return WRITE_SYNC;
+	else if (wbc->for_kupdate || wbc->for_background)
+		return WRITE_BG;
 
 	return 0;
 }
-- 
2.7.4