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-rw-r--r--kernel/res_counter.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index 6d269cc..d508363 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -66,6 +66,31 @@ done:
return ret;
}
+int res_counter_charge_nofail(struct res_counter *counter, unsigned long val,
+ struct res_counter **limit_fail_at)
+{
+ int ret, r;
+ unsigned long flags;
+ struct res_counter *c;
+
+ r = ret = 0;
+ *limit_fail_at = NULL;
+ local_irq_save(flags);
+ for (c = counter; c != NULL; c = c->parent) {
+ spin_lock(&c->lock);
+ r = res_counter_charge_locked(c, val);
+ if (r)
+ c->usage += val;
+ spin_unlock(&c->lock);
+ if (r < 0 && ret == 0) {
+ *limit_fail_at = c;
+ ret = r;
+ }
+ }
+ local_irq_restore(flags);
+
+ return ret;
+}
void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val)
{
if (WARN_ON(counter->usage < val))
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