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pidns: Wait in zap_pid_ns_processes until pid_ns->nr_hashed == 1

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Looking at pid_ns->nr_hashed is a bit simpler and it works for
disjoint process trees that an unshare or a join of a pid_namespace
may create.

Acked-by: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2012-08-01 15:03:42 -07:00
parent 5e1182deb8
commit af4b8a83ad
3 changed files with 17 additions and 26 deletions
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16
kernel/pid.c
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@ -273,10 +273,20 @@ void free_pid(struct pid *pid)
spin_lock_irqsave(&pidmap_lock, flags);
for (i = 0; i <= pid->level; i++) {
struct upid *upid = pid->numbers + i;
struct pid_namespace *ns = upid->ns;
hlist_del_rcu(&upid->pid_chain);
if (--upid->ns->nr_hashed == 0) {
upid->ns->nr_hashed = -1;
schedule_work(&upid->ns->proc_work);
switch(--ns->nr_hashed) {
case 1:
/* When all that is left in the pid namespace
* is the reaper wake up the reaper. The reaper
* may be sleeping in zap_pid_ns_processes().
*/
wake_up_process(ns->child_reaper);
break;
case 0:
ns->nr_hashed = -1;
schedule_work(&ns->proc_work);
break;
}
}
spin_unlock_irqrestore(&pidmap_lock, flags);