writeback: introduce wbc.for_background

It will lower the flush priority for NFS, and maybe more in future.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 0306c8e7d6b5..0793961f7699 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -738,6 +738,7 @@ static long wb_writeback(struct bdi_writeback *wb,
                 .sync_mode              = args->sync_mode,
                 .older_than_this        = NULL,
                 .for_kupdate            = args->for_kupdate,
+                .for_background         = args->for_background,
                 .range_cyclic           = args->range_cyclic,
         };
         unsigned long oldest_jif;