short type;
short access;
struct list_head list;
+ struct rcu_head rcu;
};
struct dev_cgroup {
}
if (whcopy != NULL)
- list_add_tail(&whcopy->list, &dev_cgroup->whitelist);
+ list_add_tail_rcu(&whcopy->list, &dev_cgroup->whitelist);
spin_unlock(&dev_cgroup->lock);
return 0;
}
+static void whitelist_item_free(struct rcu_head *rcu)
+{
+ struct dev_whitelist_item *item;
+
+ item = container_of(rcu, struct dev_whitelist_item, rcu);
+ kfree(item);
+}
+
/*
* called under cgroup_lock()
* since the list is visible to other tasks, we need the spinlock also
remove:
walk->access &= ~wh->access;
if (!walk->access) {
- list_del(&walk->list);
- kfree(walk);
+ list_del_rcu(&walk->list);
+ call_rcu(&walk->rcu, whitelist_item_free);
}
}
spin_unlock(&dev_cgroup->lock);
}
wh->minor = wh->major = ~0;
wh->type = DEV_ALL;
- wh->access = ACC_MKNOD | ACC_READ | ACC_WRITE;
+ wh->access = ACC_MASK;
list_add(&wh->list, &dev_cgroup->whitelist);
} else {
parent_dev_cgroup = cgroup_to_devcgroup(parent_cgroup);
static void set_majmin(char *str, unsigned m)
{
- memset(str, 0, MAJMINLEN);
if (m == ~0)
- sprintf(str, "*");
+ strcpy(str, "*");
else
- snprintf(str, MAJMINLEN, "%u", m);
+ sprintf(str, "%u", m);
}
static int devcgroup_seq_read(struct cgroup *cgroup, struct cftype *cft,
struct dev_whitelist_item *wh;
char maj[MAJMINLEN], min[MAJMINLEN], acc[ACCLEN];
- spin_lock(&devcgroup->lock);
- list_for_each_entry(wh, &devcgroup->whitelist, list) {
+ rcu_read_lock();
+ list_for_each_entry_rcu(wh, &devcgroup->whitelist, list) {
set_access(acc, wh->access);
set_majmin(maj, wh->major);
set_majmin(min, wh->minor);
seq_printf(m, "%c %s:%s %s\n", type_to_char(wh->type),
maj, min, acc);
}
- spin_unlock(&devcgroup->lock);
+ rcu_read_unlock();
return 0;
}
{
struct dev_cgroup *cur_devcgroup;
const char *b;
+ char *endp;
int retval = 0, count;
struct dev_whitelist_item wh;
wh.major = ~0;
b++;
} else if (isdigit(*b)) {
- wh.major = 0;
- while (isdigit(*b)) {
- wh.major = wh.major*10+(*b-'0');
- b++;
- }
+ wh.major = simple_strtoul(b, &endp, 10);
+ b = endp;
} else {
return -EINVAL;
}
wh.minor = ~0;
b++;
} else if (isdigit(*b)) {
- wh.minor = 0;
- while (isdigit(*b)) {
- wh.minor = wh.minor*10+(*b-'0');
- b++;
- }
+ wh.minor = simple_strtoul(b, &endp, 10);
+ b = endp;
} else {
return -EINVAL;
}
if (!dev_cgroup)
return 0;
- spin_lock(&dev_cgroup->lock);
- list_for_each_entry(wh, &dev_cgroup->whitelist, list) {
+ rcu_read_lock();
+ list_for_each_entry_rcu(wh, &dev_cgroup->whitelist, list) {
if (wh->type & DEV_ALL)
goto acc_check;
if ((wh->type & DEV_BLOCK) && !S_ISBLK(inode->i_mode))
continue;
if ((mask & MAY_READ) && !(wh->access & ACC_READ))
continue;
- spin_unlock(&dev_cgroup->lock);
+ rcu_read_unlock();
return 0;
}
- spin_unlock(&dev_cgroup->lock);
+ rcu_read_unlock();
return -EPERM;
}
if (!dev_cgroup)
return 0;
- spin_lock(&dev_cgroup->lock);
+ rcu_read_lock();
list_for_each_entry(wh, &dev_cgroup->whitelist, list) {
if (wh->type & DEV_ALL)
goto acc_check;
acc_check:
if (!(wh->access & ACC_MKNOD))
continue;
- spin_unlock(&dev_cgroup->lock);
+ rcu_read_unlock();
return 0;
}
- spin_unlock(&dev_cgroup->lock);
+ rcu_read_unlock();
return -EPERM;
}