pid namespaces: helpers to find the task by its numerical ids

When searching the task by numerical id on may need to find it using global
pid (as it is done now in kernel) or by its virtual id, e.g.  when sending a
signal to a task from one namespace the sender will specify the task's virtual
id and we should find the task by this value.

[akpm@linux-foundation.org: fix gfs2 linkage]
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>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 36983e7bb2c1..50e149e08d96 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2333,7 +2333,7 @@ static struct task_struct *next_tgid(unsigned int tgid)
         rcu_read_lock();
 retry:
         task = NULL;
-        pid = find_ge_pid(tgid);
+        pid = find_ge_pid(tgid, &init_pid_ns);
         if (pid) {
                 tgid = pid->nr + 1;
                 task = pid_task(pid, PIDTYPE_PID);