static __cacheline_aligned_in_smp DEFINE_SPINLOCK(pidmap_lock);
-static void free_pidmap(struct pid_namespace *pid_ns, int pid)
+static void free_pidmap(struct upid *upid)
{
- struct pidmap *map = pid_ns->pidmap + pid / BITS_PER_PAGE;
- int offset = pid & BITS_PER_PAGE_MASK;
+ int nr = upid->nr;
+ struct pidmap *map = upid->ns->pidmap + nr / BITS_PER_PAGE;
+ int offset = nr & BITS_PER_PAGE_MASK;
clear_bit(offset, map->page);
atomic_inc(&map->nr_free);
spin_unlock_irqrestore(&pidmap_lock, flags);
for (i = 0; i <= pid->level; i++)
- free_pidmap(pid->numbers[i].ns, pid->numbers[i].nr);
+ free_pidmap(pid->numbers + i);
call_rcu(&pid->rcu, delayed_put_pid);
}
return pid;
out_free:
- for (i++; i <= ns->level; i++)
- free_pidmap(pid->numbers[i].ns, pid->numbers[i].nr);
+ while (++i <= ns->level)
+ free_pidmap(pid->numbers + i);
kmem_cache_free(ns->pid_cachep, pid);
pid = NULL;
/*
* attach_pid() must be called with the tasklist_lock write-held.
*/
-int attach_pid(struct task_struct *task, enum pid_type type,
+void attach_pid(struct task_struct *task, enum pid_type type,
struct pid *pid)
{
struct pid_link *link;
link = &task->pids[type];
link->pid = pid;
hlist_add_head_rcu(&link->node, &pid->tasks[type]);
-
- return 0;
}
-void detach_pid(struct task_struct *task, enum pid_type type)
+static void __change_pid(struct task_struct *task, enum pid_type type,
+ struct pid *new)
{
struct pid_link *link;
struct pid *pid;
pid = link->pid;
hlist_del_rcu(&link->node);
- link->pid = NULL;
+ link->pid = new;
for (tmp = PIDTYPE_MAX; --tmp >= 0; )
if (!hlist_empty(&pid->tasks[tmp]))
free_pid(pid);
}
+void detach_pid(struct task_struct *task, enum pid_type type)
+{
+ __change_pid(task, type, NULL);
+}
+
+void change_pid(struct task_struct *task, enum pid_type type,
+ struct pid *pid)
+{
+ __change_pid(task, type, pid);
+ attach_pid(task, type, pid);
+}
+
/* transfer_pid is an optimization of attach_pid(new), detach_pid(old) */
void transfer_pid(struct task_struct *old, struct task_struct *new,
enum pid_type type)
{
new->pids[type].pid = old->pids[type].pid;
hlist_replace_rcu(&old->pids[type].node, &new->pids[type].node);
- old->pids[type].pid = NULL;
}
struct task_struct *pid_task(struct pid *pid, enum pid_type type)
EXPORT_SYMBOL(find_task_by_pid_type_ns);
-struct task_struct *find_task_by_pid(pid_t nr)
-{
- return find_task_by_pid_type_ns(PIDTYPE_PID, nr, &init_pid_ns);
-}
-EXPORT_SYMBOL(find_task_by_pid);
-
struct task_struct *find_task_by_vpid(pid_t vnr)
{
return find_task_by_pid_type_ns(PIDTYPE_PID, vnr,