writeback: mark background writeback as such

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

Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 50c96ee..c78f9f0 100644 (file)
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -107,6 +107,8 @@ static inline int wbc_to_write_flags(struct writeback_control *wbc)
 {
        if (wbc->sync_mode == WB_SYNC_ALL)
                return REQ_SYNC;
+       else if (wbc->for_kupdate || wbc->for_background)
+               return REQ_BACKGROUND;
 
        return 0;
 }