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Message-ID: <46BC507E.mailGKD1OUF88@openvz.org>
Date: Fri, 10 Aug 2007 15:48:14 +0400
From: xemul@...nvz.org
To: akpm@...l.org
Cc: xemul@...nvz.org, devel@...nvz.org, linux-kernel@...r.kernel.org,
containers@...ts.osdl.org, oleg@...sign.ru, sukadev@...ibm.com
Subject: [PATCH 12/20] Miscelaneous preparations for pid namespaces
* remove pid.h from pid_namespaces.h;
* rework is_(container|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@...nvz.org>
Cc: Oleg Nesterov <oleg@...sign.ru>
---
include/linux/pid_namespace.h | 10 ++++++----
include/linux/sched.h | 12 +++++-------
kernel/pid.c | 21 ++++++++++++++-------
3 files changed, 25 insertions(+), 18 deletions(-)
--- ./include/linux/pid_namespace.h.ve11 2007-08-10 12:40:09.000000000 +0400
+++ ./include/linux/pid_namespace.h 2007-08-10 12:40:09.000000000 +0400
@@ -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 *kre
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
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 */
--- ./include/linux/sched.h.ve11 2007-08-10 12:40:08.000000000 +0400
+++ ./include/linux/sched.h 2007-08-10 12:40:09.000000000 +0400
@@ -1373,19 +1373,17 @@ static inline int pid_alive(struct task_
* @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;
--- ./kernel/pid.c.ve11 2007-08-10 12:40:08.000000000 +0400
+++ ./kernel/pid.c 2007-08-10 12:40:30.000000000 +0400
@@ -72,10 +72,20 @@ struct pid_namespace init_pid_ns = {
.child_reaper = &init_task,
};
-int is_global_init(struct task_struct *tsk)
+int is_container_init(struct task_struct *tsk)
{
- return tsk == init_pid_ns.child_reaper;
+ int ret = 0;
+ struct pid *pid;
+
+ rcu_read_lock();
+ pid = task_pid(tsk);
+ if (pid != NULL && pid->numbers[pid->level].nr == 1)
+ ret = 1;
+ rcu_read_unlock();
+
+ return ret;
}
+EXPORT_SYMBOL(is_container_init);
/*
* Note: disable interrupts while the pidmap_lock is held as an
@@ -191,8 +201,7 @@ fastcall void put_pid(struct pid *pid)
if ((atomic_read(&pid->count) == 1) ||
atomic_dec_and_test(&pid->count)) {
kmem_cache_free(ns->pid_cachep, pid);
- if (ns != &init_pid_ns)
- put_pid_ns(ns);
+ put_pid_ns(ns);
}
}
EXPORT_SYMBOL_GPL(put_pid);
@@ -243,9 +252,7 @@ struct pid *alloc_pid(struct pid_namespa
tmp = tmp->parent;
}
- if (ns != &init_pid_ns)
- get_pid_ns(ns);
-
+ get_pid_ns(ns);
pid->level = ns->level;
pid->nr = pid->numbers[0].nr;
atomic_set(&pid->count, 1);
-
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