Merge commit 'v2.6.29-rc1' into core/urgent

1 files changed, 35 insertions, 9 deletions

diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index f275c8eca772..bf8e7534c803 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -15,10 +15,11 @@
 #include <linux/uaccess.h>
 #include <linux/mm.h>
 
-void res_counter_init(struct res_counter *counter)
+void res_counter_init(struct res_counter *counter, struct res_counter *parent)
 {
         spin_lock_init(&counter->lock);
         counter->limit = (unsigned long long)LLONG_MAX;
+        counter->parent = parent;
 }
 
 int res_counter_charge_locked(struct res_counter *counter, unsigned long val)
@@ -34,14 +35,34 @@ int res_counter_charge_locked(struct res_counter *counter, unsigned long val)
         return 0;
 }
 
-int res_counter_charge(struct res_counter *counter, unsigned long val)
+int res_counter_charge(struct res_counter *counter, unsigned long val,
+                        struct res_counter **limit_fail_at)
 {
         int ret;
         unsigned long flags;
-
-        spin_lock_irqsave(&counter->lock, flags);
-        ret = res_counter_charge_locked(counter, val);
-        spin_unlock_irqrestore(&counter->lock, flags);
+        struct res_counter *c, *u;
+
+        *limit_fail_at = NULL;
+        local_irq_save(flags);
+        for (c = counter; c != NULL; c = c->parent) {
+                spin_lock(&c->lock);
+                ret = res_counter_charge_locked(c, val);
+                spin_unlock(&c->lock);
+                if (ret < 0) {
+                        *limit_fail_at = c;
+                        goto undo;
+                }
+        }
+        ret = 0;
+        goto done;
+undo:
+        for (u = counter; u != c; u = u->parent) {
+                spin_lock(&u->lock);
+                res_counter_uncharge_locked(u, val);
+                spin_unlock(&u->lock);
+        }
+done:
+        local_irq_restore(flags);
         return ret;
 }
 
@@ -56,10 +77,15 @@ void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val)
 void res_counter_uncharge(struct res_counter *counter, unsigned long val)
 {
         unsigned long flags;
+        struct res_counter *c;
 
-        spin_lock_irqsave(&counter->lock, flags);
-        res_counter_uncharge_locked(counter, val);
-        spin_unlock_irqrestore(&counter->lock, flags);
+        local_irq_save(flags);
+        for (c = counter; c != NULL; c = c->parent) {
+                spin_lock(&c->lock);
+                res_counter_uncharge_locked(c, val);
+                spin_unlock(&c->lock);
+        }
+        local_irq_restore(flags);
 }