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authorPavel Emelyanov <xemul@openvz.org>2007-10-18 23:40:09 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 11:53:39 -0700
commitb461cc03828c743aed6b3855b9ab0d39a9d54ec5 (patch)
treeb39ff42df1564adf800d9c4a01ba78ed14f8f9a2 /include
parent07543f5c75cee744b791cf7716c69571486fe753 (diff)
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 <xemul@openvz.org> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Paul Menage <menage@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/pid_namespace.h10
-rw-r--r--include/linux/sched.h12
2 files changed, 11 insertions, 11 deletions
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index 416d4e4ce94..0135c76c76c 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -4,7 +4,6 @@
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/threads.h>
-#include <linux/pid.h>
#include <linux/nsproxy.h>
#include <linux/kref.h>
@@ -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 511cc4549f5..b0bf326143a 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;