From b461cc03828c743aed6b3855b9ab0d39a9d54ec5 Mon Sep 17 00:00:00 2001 From: Pavel Emelyanov Date: Thu, 18 Oct 2007 23:40:09 -0700 Subject: pid namespaces: miscellaneous preparations for pid namespaces * remove pid.h from pid_namespaces.h; * rework is_(cgroup|global)_init; * optimize (get|put)_pid_ns for init_pid_ns; * declare task_child_reaper to return actual reaper. Signed-off-by: Pavel Emelyanov Cc: Oleg Nesterov Cc: Sukadev Bhattiprolu Cc: Paul Menage Cc: "Eric W. Biederman" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/pid_namespace.h | 10 ++++++---- include/linux/sched.h | 12 +++++------- 2 files changed, 11 insertions(+), 11 deletions(-) (limited to 'include/linux') diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h index 416d4e4ce94e..0135c76c76c6 100644 --- a/include/linux/pid_namespace.h +++ b/include/linux/pid_namespace.h @@ -4,7 +4,6 @@ #include #include #include -#include #include #include @@ -32,7 +31,8 @@ extern struct pid_namespace init_pid_ns; static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) { - kref_get(&ns->kref); + if (ns != &init_pid_ns) + kref_get(&ns->kref); return ns; } @@ -41,7 +41,8 @@ extern void free_pid_ns(struct kref *kref); static inline void put_pid_ns(struct pid_namespace *ns) { - kref_put(&ns->kref, free_pid_ns); + if (ns != &init_pid_ns) + kref_put(&ns->kref, free_pid_ns); } static inline struct pid_namespace *task_active_pid_ns(struct task_struct *tsk) @@ -51,7 +52,8 @@ static inline struct pid_namespace *task_active_pid_ns(struct task_struct *tsk) static inline struct task_struct *task_child_reaper(struct task_struct *tsk) { - return init_pid_ns.child_reaper; + BUG_ON(tsk != current); + return tsk->nsproxy->pid_ns->child_reaper; } #endif /* _LINUX_PID_NS_H */ diff --git a/include/linux/sched.h b/include/linux/sched.h index 511cc4549f58..b0bf326143a9 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1329,19 +1329,17 @@ static inline int pid_alive(struct task_struct *p) * @tsk: Task structure to be checked. * * Check if a task structure is the first user space task the kernel created. - * - * TODO: We should inline this function after some cleanups in pid_namespace.h */ -extern int is_global_init(struct task_struct *tsk); +static inline int is_global_init(struct task_struct *tsk) +{ + return tsk->pid == 1; +} /* * is_container_init: * check whether in the task is init in its own pid namespace. */ -static inline int is_container_init(struct task_struct *tsk) -{ - return tsk->pid == 1; -} +extern int is_container_init(struct task_struct *tsk); extern struct pid *cad_pid; -- cgit v1.2.3