On 07/26, Pavel Emelyanov wrote:
>
> -struct pid *alloc_pid(void)
> +struct pid *alloc_pid(struct pid_namespace *ns)
Why? We have the only caller, copy_process(), ns == task_active_pid_ns()
always.
> {
> struct pid *pid;
> enum pid_type type;
> - int nr = -1;
> - struct pid_namespace *ns;
> + int i, nr;
> + struct pid_namespace *tmp;
>
> - ns = task_active_pid_ns(current);
> pid = kmem_cache_alloc(ns->pid_cachep, GFP_KERNEL);
> if (!pid)
> goto out;
>
> - nr = alloc_pidmap(ns);
> - if (nr < 0)
> - goto out_free;
> + tmp = ns;
> + for (i = ns->level; i >= 0; i--) {
> + nr = alloc_pidmap(tmp);
> + if (nr < 0)
> + goto out_free;
> +
> + pid->numbers[i].nr = nr;
> + pid->numbers[i].ns = tmp;
> + tmp = tmp->parent;
Hm... There is no ->parent in "struct pid_namespace", and this
patch doesn't add it.
> + if (ns != &init_pid_ns)
> + get_pid_ns(ns);
Q: put_pid() checks "ns != &init_pid_ns" as well, this is just
an optimization, yes? Perhaps we can move this check into
get_pid_ns/put_pid_ns.
We are doing get_pid_ns() only for the "top namespace"... I guess
this can work if pid_namespace does get_pid_ns() on its ->parent.
This patch looks incomplete.
Oleg.
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