[Devel] [RFC][PATCH 06/16] Define is_global_init()

[Pavel Emelianov]

> Index: lx26-21-mm2/kernel/pid.c
> ===================================================================
> --- lx26-21-mm2.orig/kernel/pid.c	2007-05-22 16:59:34.000000000 -0700
> +++ lx26-21-mm2/kernel/pid.c	2007-05-22 16:59:46.000000000 -0700
> @@ -71,6 +71,27 @@ struct pid_namespace init_pid_ns = {
>  	.child_reaper = &init_task
>  };
>  
> +
> +/**
> + * is_global_init - check if a task structure is init
> + * @tsk: Task structure to be checked.
> + *
> + * Check if a task structure is the first user space task the kernel created.
> + */
> +int is_global_init(struct task_struct *tsk)
> +{
> +	return (task_active_pid_ns(tsk) == &init_pid_ns && tsk->pid == 1);

This can OOPS if you pass arbitrary task to this call...
tsk->nsproxy can already be NULL.

> +}
> +
> +/*
> + * is_container_init:
> + * check whether in the task is init in it's own pid namespace.
> + */
> +int is_container_init(struct task_struct *tsk)
> +{
> +	return tsk->pid == 1;
> +}
> +
>  /*
>   * Note: disable interrupts while the pidmap_lock is held as an
>   * interrupt might come in and do read_lock(&tasklist_lock).
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