1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 469d56443c63..a008982e7c08 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -73,6 +73,11 @@ struct backing_dev_info {
 
         struct percpu_counter bdi_stat[NR_BDI_STAT_ITEMS];
 
+        unsigned long bw_time_stamp;    /* last time write bw is updated */
+        unsigned long written_stamp;    /* pages written at bw_time_stamp */
+        unsigned long write_bandwidth;  /* the estimated write bandwidth */
+        unsigned long avg_write_bandwidth; /* further smoothed write bw */
+
         struct prop_local_percpu completions;
         int dirty_exceeded;