[Lse-tech] [RFC][PATCH 002/011] Move fork notification

[Matt H. <mat...@us...>]

Move the location of the fork notification chain calls because
Process Events, which will use Task Notifier, needs the real
parent's pid in the task_struct.

Index: linux-2.6.17-rc4/kernel/fork.c
===================================================================
--- linux-2.6.17-rc4.orig/kernel/fork.c
+++ linux-2.6.17-rc4/kernel/fork.c
@@ -1120,12 +1120,10 @@ static task_t *copy_process(unsigned lon
 	/* ok, now we should be set up.. */
 	p->exit_signal = (clone_flags & CLONE_THREAD) ? -1 : (clone_flags & CSIGNAL);
 	p->pdeath_signal = 0;
 	p->exit_state = 0;
 
-	if (task_notifier_call_chain(TN_FORK, p))
-		goto bad_fork_cleanup_namespace;
 	/*
 	 * Ok, make it visible to the rest of the system.
 	 * We dont wake it up yet.
 	 */
 	p->group_leader = p;
@@ -1158,10 +1156,11 @@ static task_t *copy_process(unsigned lon
 		p->real_parent = current->real_parent;
 	else
 		p->real_parent = current;
 	p->parent = p->real_parent;
 
+
 	spin_lock(&current->sighand->siglock);
 
 	/*
 	 * Process group and session signals need to be delivered to just the
 	 * parent before the fork or both the parent and the child after the
@@ -1223,10 +1222,11 @@ static task_t *copy_process(unsigned lon
 	}
 
 	total_forks++;
 	spin_unlock(&current->sighand->siglock);
 	write_unlock_irq(&tasklist_lock);
+	task_notifier_call_chain(TN_FORK, p);
 	proc_fork_connector(p);
 	return p;
 
 bad_fork_cleanup_namespace:
 	exit_namespace(p);