We can write whatever to memory.force_empty:
echo 999 > memory.force_empty
echo wow > memory.force_empty
This is odd, so let's make '1' to be the only valid value.
Signed-off-by: Li Zefan <[EMAIL PROTECTED]>
---
mm/memcontrol.c | 21 ++++++++++++---------
1 files changed, 12 insertions(+), 9 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index eb681a6..6145031 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -868,15 +868,18 @@ static ssize_t mem_cgroup_write(struct cgroup *cont,
struct cftype *cft,
mem_cgroup_write_strategy);
}
-static ssize_t mem_force_empty_write(struct cgroup *cont,
- struct cftype *cft, struct file *file,
- const char __user *userbuf,
- size_t nbytes, loff_t *ppos)
+static int mem_force_empty_write(struct cgroup *cont, struct cftype *cft,
+ u64 val)
{
- struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
- int ret = mem_cgroup_force_empty(mem);
- if (!ret)
- ret = nbytes;
+ struct mem_cgroup *mem;
+ int ret;
+
+ if (val != 1)
+ return -EINVAL;
+
+ mem = mem_cgroup_from_cont(cont);
+ ret = mem_cgroup_force_empty(mem);
+
return ret;
}
@@ -935,7 +938,7 @@ static struct cftype mem_cgroup_files[] = {
},
{
.name = "force_empty",
- .write = mem_force_empty_write,
+ .write_u64 = mem_force_empty_write,
},
{
.name = "stat",
--
1.5.4.rc3
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