first commit

1 files changed, 200 insertions, 0 deletions

diff --git a/kernel/res_counter.c b/kernel/res_counter.c
new file mode 100644
index 000000000..ff55247e7
--- /dev/null
+++ b/kernel/res_counter.c
@@ -0,0 +1,200 @@
+/*
+ * resource cgroups
+ *
+ * Copyright 2007 OpenVZ SWsoft Inc
+ *
+ * Author: Pavel Emelianov <xemul@openvz.org>
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/parser.h>
+#include <linux/fs.h>
+#include <linux/res_counter.h>
+#include <linux/uaccess.h>
+#include <linux/mm.h>
+
+void res_counter_init(struct res_counter *counter, struct res_counter *parent)
+{
+	spin_lock_init(&counter->lock);
+	counter->limit = RESOURCE_MAX;
+	counter->soft_limit = RESOURCE_MAX;
+	counter->parent = parent;
+}
+
+int res_counter_charge_locked(struct res_counter *counter, unsigned long val,
+			      bool force)
+{
+	int ret = 0;
+
+	if (counter->usage + val > counter->limit) {
+		counter->failcnt++;
+		ret = -ENOMEM;
+		if (!force)
+			return ret;
+	}
+
+	counter->usage += val;
+	if (counter->usage > counter->max_usage)
+		counter->max_usage = counter->usage;
+	return ret;
+}
+
+static int __res_counter_charge(struct res_counter *counter, unsigned long val,
+				struct res_counter **limit_fail_at, bool force)
+{
+	int ret, r;
+	unsigned long flags;
+	struct res_counter *c, *u;
+
+	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, force);
+		spin_unlock(&c->lock);
+		if (r < 0 && !ret) {
+			ret = r;
+			*limit_fail_at = c;
+			if (!force)
+				break;
+		}
+	}
+
+	if (ret < 0 && !force) {
+		for (u = counter; u != c; u = u->parent) {
+			spin_lock(&u->lock);
+			res_counter_uncharge_locked(u, val);
+			spin_unlock(&u->lock);
+		}
+	}
+	local_irq_restore(flags);
+
+	return ret;
+}
+
+int res_counter_charge(struct res_counter *counter, unsigned long val,
+			struct res_counter **limit_fail_at)
+{
+	return __res_counter_charge(counter, val, limit_fail_at, false);
+}
+
+int res_counter_charge_nofail(struct res_counter *counter, unsigned long val,
+			      struct res_counter **limit_fail_at)
+{
+	return __res_counter_charge(counter, val, limit_fail_at, true);
+}
+
+u64 res_counter_uncharge_locked(struct res_counter *counter, unsigned long val)
+{
+	if (WARN_ON(counter->usage < val))
+		val = counter->usage;
+
+	counter->usage -= val;
+	return counter->usage;
+}
+
+u64 res_counter_uncharge_until(struct res_counter *counter,
+			       struct res_counter *top,
+			       unsigned long val)
+{
+	unsigned long flags;
+	struct res_counter *c;
+	u64 ret = 0;
+
+	local_irq_save(flags);
+	for (c = counter; c != top; c = c->parent) {
+		u64 r;
+		spin_lock(&c->lock);
+		r = res_counter_uncharge_locked(c, val);
+		if (c == counter)
+			ret = r;
+		spin_unlock(&c->lock);
+	}
+	local_irq_restore(flags);
+	return ret;
+}
+
+u64 res_counter_uncharge(struct res_counter *counter, unsigned long val)
+{
+	return res_counter_uncharge_until(counter, NULL, val);
+}
+
+static inline unsigned long long *
+res_counter_member(struct res_counter *counter, int member)
+{
+	switch (member) {
+	case RES_USAGE:
+		return &counter->usage;
+	case RES_MAX_USAGE:
+		return &counter->max_usage;
+	case RES_LIMIT:
+		return &counter->limit;
+	case RES_FAILCNT:
+		return &counter->failcnt;
+	case RES_SOFT_LIMIT:
+		return &counter->soft_limit;
+	};
+
+	BUG();
+	return NULL;
+}
+
+ssize_t res_counter_read(struct res_counter *counter, int member,
+		const char __user *userbuf, size_t nbytes, loff_t *pos,
+		int (*read_strategy)(unsigned long long val, char *st_buf))
+{
+	unsigned long long *val;
+	char buf[64], *s;
+
+	s = buf;
+	val = res_counter_member(counter, member);
+	if (read_strategy)
+		s += read_strategy(*val, s);
+	else
+		s += sprintf(s, "%llu\n", *val);
+	return simple_read_from_buffer((void __user *)userbuf, nbytes,
+			pos, buf, s - buf);
+}
+
+#if BITS_PER_LONG == 32
+u64 res_counter_read_u64(struct res_counter *counter, int member)
+{
+	unsigned long flags;
+	u64 ret;
+
+	spin_lock_irqsave(&counter->lock, flags);
+	ret = *res_counter_member(counter, member);
+	spin_unlock_irqrestore(&counter->lock, flags);
+
+	return ret;
+}
+#else
+u64 res_counter_read_u64(struct res_counter *counter, int member)
+{
+	return *res_counter_member(counter, member);
+}
+#endif
+
+int res_counter_memparse_write_strategy(const char *buf,
+					unsigned long long *res)
+{
+	char *end;
+
+	/* return RESOURCE_MAX(unlimited) if "-1" is specified */
+	if (*buf == '-') {
+		*res = simple_strtoull(buf + 1, &end, 10);
+		if (*res != 1 || *end != '\0')
+			return -EINVAL;
+		*res = RESOURCE_MAX;
+		return 0;
+	}
+
+	*res = memparse(buf, &end);
+	if (*end != '\0')
+		return -EINVAL;
+
+	*res = PAGE_ALIGN(*res);
+	return 0;
+}