#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>
+#include <linux/mm.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)
}
counter->usage += val;
+ if (counter->usage > counter->max_usage)
+ counter->max_usage = counter->usage;
return 0;
}
}
-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:
}
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);
}
-ssize_t res_counter_write(struct res_counter *counter, int member,
- const char __user *userbuf, size_t nbytes, loff_t *pos)
+u64 res_counter_read_u64(struct res_counter *counter, int member)
{
- int ret;
- char *buf, *end;
- unsigned long tmp, *val;
-
- buf = kmalloc(nbytes + 1, GFP_KERNEL);
- ret = -ENOMEM;
- if (buf == NULL)
- goto out;
-
- buf[nbytes] = '\0';
- ret = -EFAULT;
- if (copy_from_user(buf, userbuf, nbytes))
- goto out_free;
+ return *res_counter_member(counter, member);
+}
- ret = -EINVAL;
- tmp = simple_strtoul(buf, &end, 10);
+int res_counter_memparse_write_strategy(const char *buf,
+ unsigned long long *res)
+{
+ char *end;
+ /* FIXME - make memparse() take const char* args */
+ *res = memparse((char *)buf, &end);
if (*end != '\0')
- goto out_free;
+ return -EINVAL;
+
+ *res = PAGE_ALIGN(*res);
+ return 0;
+}
+int res_counter_write(struct res_counter *counter, int member,
+ const char *buf, write_strategy_fn write_strategy)
+{
+ char *end;
+ unsigned long flags;
+ unsigned long long tmp, *val;
+
+ if (write_strategy) {
+ if (write_strategy(buf, &tmp))
+ return -EINVAL;
+ } else {
+ tmp = simple_strtoull(buf, &end, 10);
+ if (*end != '\0')
+ return -EINVAL;
+ }
+ spin_lock_irqsave(&counter->lock, flags);
val = res_counter_member(counter, member);
*val = tmp;
- ret = nbytes;
-out_free:
- kfree(buf);
-out:
- return ret;
+ spin_unlock_irqrestore(&counter->lock, flags);
+ return 0;
}