From 130f77ecb2e7d5ac3e53e620f55e374f4a406b20 Mon Sep 17 00:00:00 2001
From: Pavel Emelyanov <xemul@openvz.org>
Date: Thu, 18 Oct 2007 23:40:11 -0700
Subject: pid namespaces: make proc_flush_task() actually from entries from
 multiple namespaces

This means that proc_flush_task_mnt() is to be called for many proc mounts and
with different ids, depending on the namespace this pid is to be flushed from.

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>
---
 fs/proc/base.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

(limited to 'fs')

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 50e149e08d9..5e0c6a1ce8b 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2259,8 +2259,22 @@ out:
 
 void proc_flush_task(struct task_struct *task)
 {
-	proc_flush_task_mnt(proc_mnt, task->pid,
-			thread_group_leader(task) ? 0 : task->tgid);
+	int i, leader;
+	struct pid *pid, *tgid;
+	struct upid *upid;
+
+	leader = thread_group_leader(task);
+	proc_flush_task_mnt(proc_mnt, task->pid, leader ? task->tgid : 0);
+	pid = task_pid(task);
+	if (pid->level == 0)
+		return;
+
+	tgid = task_tgid(task);
+	for (i = 1; i <= pid->level; i++) {
+		upid = &pid->numbers[i];
+		proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
+				leader ? 0 : tgid->numbers[i].nr);
+	}
 }
 
 static struct dentry *proc_pid_instantiate(struct inode *dir,
-- 
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