[PATCH 27/28] [MULTI 6/6] Moving the pid into the namespace

[Pavel Emelianov]

This is the implementation of move_pid_to_ns for multilevel model
(see [PATCH 15/18] and [FLAT 6/6])

Signed-off-by: Pavel Emelianov <xemul at openvz.org>

---

 pid.c |   42 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 42 insertions(+)

--- ./kernel/pid.c.multiclone	2007-06-15 15:41:30.000000000 +0400
+++ ./kernel/pid.c	2007-06-15 15:42:36.000000000 +0400
@@ -531,6 +531,48 @@ struct pid * fastcall find_pid_ns(int nr
 	pnr = find_nr_by_nr(nr, ns);
 	return pnr != NULL ? pnr->pid : NULL;
 }
+
+static inline int move_pid_to_ns(struct pid *pid, struct pid_namespace *ns)
+{
+	int err;
+
+	/*
+	 * the pid is in this ns already. e.g. this may happen if
+	 * the task has equal pid and pgid
+	 */
+	if (find_nr_by_pid(pid, ns))
+		return 0;
+
+	err = alloc_pid_nr(pid, ns);
+	if (err < 0)
+		return err;
+
+	spin_lock_irq(&pidmap_lock);
+	hash_pid_nr(pid->pid_nrs);
+	spin_unlock_irq(&pidmap_lock);
+	return 0;
+}
+
+static inline void del_pid_from_ns(struct pid *pid, struct pid_namespace *ns)
+{
+	struct pid_number *pnr, *prev;
+
+	for_each_pid_nr(prev, pid) {
+		pnr = prev->next;
+		if (pnr != NULL && pnr->ns == ns)
+			goto found;
+	}
+	return;
+
+found:
+	prev->next = pnr->next;
+
+	spin_lock_irq(&pidmap_lock);
+	unhash_pid_nr(pnr);
+	spin_unlock_irq(&pidmap_lock);
+
+	free_pid_nr(pnr);
+}
 #endif
 #endif