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pid namespaces: miscellaneous preparations for pid namespaces

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* 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>
This commit is contained in:
Pavel Emelyanov 2007-10-18 23:40:09 -07:00 • committed by Linus Torvalds
parent 07543f5c75
commit b461cc0382
3 changed files with 25 additions and 18 deletions
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10
include/linux/pid_namespace.h
View file

@ -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 */