user_statfs
int error = user_statfs(pathname, &linux_stat);
int error = user_statfs(pathname, &linux_stat);
int error = user_statfs(pathname, &st);
error = user_statfs(pathname, &st);
int error = user_statfs(pathname, &tmp);
error = user_statfs(pathname, &tmp);
extern int user_statfs(const char __user *, struct kstatfs *);