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-rw-r--r--include/linux/res_counter.h33
1 files changed, 28 insertions, 5 deletions
diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index 6d9e1fca098..fdeadd9740d 100644
--- a/include/linux/res_counter.h
+++ b/include/linux/res_counter.h
@@ -63,9 +63,14 @@ u64 res_counter_read_u64(struct res_counter *counter, int member);
ssize_t res_counter_read(struct res_counter *counter, int member,
const char __user *buf, size_t nbytes, loff_t *pos,
int (*read_strategy)(unsigned long long val, char *s));
-ssize_t res_counter_write(struct res_counter *counter, int member,
- const char __user *buf, size_t nbytes, loff_t *pos,
- int (*write_strategy)(char *buf, unsigned long long *val));
+
+typedef int (*write_strategy_fn)(const char *buf, unsigned long long *val);
+
+int res_counter_memparse_write_strategy(const char *buf,
+ unsigned long long *res);
+
+int res_counter_write(struct res_counter *counter, int member,
+ const char *buffer, write_strategy_fn write_strategy);
/*
* the field descriptors. one for each member of res_counter
@@ -95,8 +100,10 @@ void res_counter_init(struct res_counter *counter);
* counter->limit _locked call expects the counter->lock to be taken
*/
-int res_counter_charge_locked(struct res_counter *counter, unsigned long val);
-int res_counter_charge(struct res_counter *counter, unsigned long val);
+int __must_check res_counter_charge_locked(struct res_counter *counter,
+ unsigned long val);
+int __must_check res_counter_charge(struct res_counter *counter,
+ unsigned long val);
/*
* uncharge - tell that some portion of the resource is released
@@ -151,4 +158,20 @@ static inline void res_counter_reset_failcnt(struct res_counter *cnt)
cnt->failcnt = 0;
spin_unlock_irqrestore(&cnt->lock, flags);
}
+
+static inline int res_counter_set_limit(struct res_counter *cnt,
+ unsigned long long limit)
+{
+ unsigned long flags;
+ int ret = -EBUSY;
+
+ spin_lock_irqsave(&cnt->lock, flags);
+ if (cnt->usage < limit) {
+ cnt->limit = limit;
+ ret = 0;
+ }
+ spin_unlock_irqrestore(&cnt->lock, flags);
+ return ret;
+}
+
#endif