1 files changed, 20 insertions, 2 deletions

diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
index fff9367a6348..33207004cfde 100644
--- a/include/linux/backing-dev-defs.h
+++ b/include/linux/backing-dev-defs.h
@@ -116,6 +116,7 @@ struct bdi_writeback {
 	struct list_head b_dirty_time;	/* time stamps are dirty */
 	spinlock_t list_lock;		/* protects the b_* lists */
 
+	atomic_t writeback_inodes;	/* number of inodes under writeback */
 	struct percpu_counter stat[NR_WB_STAT_ITEMS];
 
 	unsigned long congested;	/* WB_[a]sync_congested flags */
@@ -142,6 +143,7 @@ struct bdi_writeback {
 	spinlock_t work_lock;		/* protects work_list & dwork scheduling */
 	struct list_head work_list;
 	struct delayed_work dwork;	/* work item used for writeback */
+	struct delayed_work bw_dwork;	/* work item used for bandwidth estimate */
 
 	unsigned long dirty_sleep;	/* last wait */
 
@@ -154,6 +156,8 @@ struct bdi_writeback {
 	struct cgroup_subsys_state *blkcg_css; /* and blkcg */
 	struct list_head memcg_node;	/* anchored at memcg->cgwb_list */
 	struct list_head blkcg_node;	/* anchored at blkcg->cgwb_list */
+	struct list_head b_attached;	/* attached inodes, protected by list_lock */
+	struct list_head offline_node;	/* anchored at offline_cgwbs */
 
 	union {
 		struct work_struct release_work;
@@ -239,8 +243,9 @@ static inline void wb_get(struct bdi_writeback *wb)
 /**
  * wb_put - decrement a wb's refcount
  * @wb: bdi_writeback to put
+ * @nr: number of references to put
  */
-static inline void wb_put(struct bdi_writeback *wb)
+static inline void wb_put_many(struct bdi_writeback *wb, unsigned long nr)
 {
 	if (WARN_ON_ONCE(!wb->bdi)) {
 		/*
@@ -251,7 +256,16 @@ static inline void wb_put(struct bdi_writeback *wb)
 	}
 
 	if (wb != &wb->bdi->wb)
-		percpu_ref_put(&wb->refcnt);
+		percpu_ref_put_many(&wb->refcnt, nr);
+}
+
+/**
+ * wb_put - decrement a wb's refcount
+ * @wb: bdi_writeback to put
+ */
+static inline void wb_put(struct bdi_writeback *wb)
+{
+	wb_put_many(wb, 1);
 }
 
 /**
@@ -280,6 +294,10 @@ static inline void wb_put(struct bdi_writeback *wb)
 {
 }
 
+static inline void wb_put_many(struct bdi_writeback *wb, unsigned long nr)
+{
+}
+
 static inline bool wb_dying(struct bdi_writeback *wb)
 {
 	return false;