1 files changed, 14 insertions, 0 deletions

diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index 8cb1ecd420a9..df8085acba16 100644
--- a/include/linux/res_counter.h
+++ b/include/linux/res_counter.h
@@ -25,6 +25,10 @@ struct res_counter {
          */
         unsigned long long usage;
         /*
+         * the maximal value of the usage from the counter creation
+         */
+        unsigned long long max_usage;
+        /*
          * the limit that usage cannot exceed
          */
         unsigned long long limit;
@@ -67,6 +71,7 @@ ssize_t res_counter_write(struct res_counter *counter, int member,
 
 enum {
         RES_USAGE,
+        RES_MAX_USAGE,
         RES_LIMIT,
         RES_FAILCNT,
 };
@@ -127,4 +132,13 @@ static inline bool res_counter_check_under_limit(struct res_counter *cnt)
         return ret;
 }
 
+static inline void res_counter_reset_max(struct res_counter *cnt)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&cnt->lock, flags);
+        cnt->max_usage = cnt->usage;
+        spin_unlock_irqrestore(&cnt->lock, flags);
+}
+
 #endif