[PATCH 3/6] memcg: reset limit at rmdir

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

Reset res_counter's limit to be 0.
Typically called when subysystem which uses res_counter is deleted.
 
Change log: xxx -> v4 (new file)
 - cut out from memg hierarchy patch set(v3).

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

---
 include/linux/res_counter.h |    2 ++
 kernel/res_counter.c        |   11 +++++++++++
 2 files changed, 13 insertions(+)

Index: linux-2.6.26-rc5-mm3/include/linux/res_counter.h
===================================================================
--- linux-2.6.26-rc5-mm3.orig/include/linux/res_counter.h
+++ linux-2.6.26-rc5-mm3/include/linux/res_counter.h
@@ -117,6 +117,8 @@ int __must_check res_counter_charge_lock
 int __must_check res_counter_charge(struct res_counter *counter,
 		unsigned long val);
 
+int res_counter_reset_limit(struct res_counter *counter);
+
 /*
  * uncharge - tell that some portion of the resource is released
  *
Index: linux-2.6.26-rc5-mm3/kernel/res_counter.c
===================================================================
--- linux-2.6.26-rc5-mm3.orig/kernel/res_counter.c
+++ linux-2.6.26-rc5-mm3/kernel/res_counter.c
@@ -153,6 +153,17 @@ static int res_counter_resize_limit(stru
 	return ret;
 }
 
+/**
+ * res_counter_reset_limit - reset limit to be 0.
+ * @res: the res_counter to be reset.
+ *
+ * res_counter->limit is resized to be 0. return 0 at success.
+ */
+
+int res_counter_reset_limit(struct res_counter *res)
+{
+	return res_counter_resize_limit(res, 0);
+}
 
 ssize_t res_counter_write(struct res_counter *counter, int member,
 		const char __user *userbuf, size_t nbytes, loff_t *pos,

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