X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fres_counter.c;h=d3c61b4ebef238c110ae3994e0d0fdc078fabfc8;hb=61d6cc54896811086b51fa78d440311974a09b3a;hp=722c484b068bc855c65813f3082a10c6d7fb72b3;hpb=e552b6617067ab785256dcec5ca29eeea981aacb;p=pandora-kernel.git

diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index 722c484b068b..d3c61b4ebef2 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -10,13 +10,14 @@
 #include <linux/types.h>
 #include <linux/parser.h>
 #include <linux/fs.h>
+#include <linux/slab.h>
 #include <linux/res_counter.h>
 #include <linux/uaccess.h>
 
 void res_counter_init(struct res_counter *counter)
 {
 	spin_lock_init(&counter->lock);
-	counter->limit = (unsigned long)LONG_MAX;
+	counter->limit = (unsigned long long)LLONG_MAX;
 }
 
 int res_counter_charge_locked(struct res_counter *counter, unsigned long val)
@@ -27,6 +28,8 @@ int res_counter_charge_locked(struct res_counter *counter, unsigned long val)
 	}
 
 	counter->usage += val;
+	if (counter->usage > counter->max_usage)
+		counter->max_usage = counter->usage;
 	return 0;
 }
 
@@ -59,12 +62,14 @@ void res_counter_uncharge(struct res_counter *counter, unsigned long val)
 }
 
 
-static inline unsigned long *res_counter_member(struct res_counter *counter,
-						int member)
+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:
@@ -76,24 +81,35 @@ static inline unsigned long *res_counter_member(struct res_counter *counter,
 }
 
 ssize_t res_counter_read(struct res_counter *counter, int member,
-		const char __user *userbuf, size_t nbytes, loff_t *pos)
+		const char __user *userbuf, size_t nbytes, loff_t *pos,
+		int (*read_strategy)(unsigned long long val, char *st_buf))
 {
-	unsigned long *val;
+	unsigned long long *val;
 	char buf[64], *s;
 
 	s = buf;
 	val = res_counter_member(counter, member);
-	s += sprintf(s, "%lu\n", *val);
+	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);
 }
 
+u64 res_counter_read_u64(struct res_counter *counter, int member)
+{
+	return *res_counter_member(counter, member);
+}
+
 ssize_t res_counter_write(struct res_counter *counter, int member,
-		const char __user *userbuf, size_t nbytes, loff_t *pos)
+		const char __user *userbuf, size_t nbytes, loff_t *pos,
+		int (*write_strategy)(char *st_buf, unsigned long long *val))
 {
 	int ret;
 	char *buf, *end;
-	unsigned long tmp, *val;
+	unsigned long flags;
+	unsigned long long tmp, *val;
 
 	buf = kmalloc(nbytes + 1, GFP_KERNEL);
 	ret = -ENOMEM;
@@ -106,12 +122,21 @@ ssize_t res_counter_write(struct res_counter *counter, int member,
 		goto out_free;
 
 	ret = -EINVAL;
-	tmp = simple_strtoul(buf, &end, 10);
-	if (*end != '\0')
-		goto out_free;
 
+	strstrip(buf);
+	if (write_strategy) {
+		if (write_strategy(buf, &tmp)) {
+			goto out_free;
+		}
+	} else {
+		tmp = simple_strtoull(buf, &end, 10);
+		if (*end != '\0')
+			goto out_free;
+	}
+	spin_lock_irqsave(&counter->lock, flags);
 	val = res_counter_member(counter, member);
 	*val = tmp;
+	spin_unlock_irqrestore(&counter->lock, flags);
 	ret = nbytes;
 out_free:
 	kfree(buf);