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| author | Pavel Emelyanov <xemul@openvz.org> | 2007-10-19 10:40:09 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-19 22:53:39 +0400 |
| commit | b461cc03828c743aed6b3855b9ab0d39a9d54ec5 (patch) | |
| tree | b39ff42df1564adf800d9c4a01ba78ed14f8f9a2 /kernel/pid.c | |
| parent | 07543f5c75cee744b791cf7716c69571486fe753 (diff) | |
| download | linux-b461cc03828c743aed6b3855b9ab0d39a9d54ec5.tar.xz | |
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 'kernel/pid.c')
| -rw-r--r-- | kernel/pid.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/kernel/pid.c b/kernel/pid.c index a2b4cbbdd63d..4b17acdb862f 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -73,10 +73,20 @@ struct pid_namespace init_pid_ns = { }; EXPORT_SYMBOL_GPL(init_pid_ns); -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 @@ -192,8 +202,7 @@ 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); @@ -244,9 +253,7 @@ struct pid *alloc_pid(struct pid_namespace *ns) 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); |