[PATCH] pid: Implement transfer_pid and use it to simplify de_thread

In de_thread we move pids from one process to another, a rather ugly case.
The function transfer_pid makes it clear what we are doing, and makes the
action atomic.  This is useful we ever want to atomically traverse the
process group and session lists, in a rcu safe manner.

Even if the atomic properties this change should be a win as transfer_pid
should be less code to execute than executing both attach_pid and
detach_pid, and this should make de_thread slightly smaller as only a
single function call needs to be emitted.  The only downside is that the
code might be slower to execute as the odds are against transfer_pid being
in cache.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 7 deletions

diff --git a/fs/exec.c b/fs/exec.c
index 54135df2a966..b7aa3d6422d6 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -696,23 +696,20 @@ static int de_thread(struct task_struct *tsk)
                  */
 
                 /* Become a process group leader with the old leader's pid.
-                 * Note: The old leader also uses thispid until release_task
+                 * The old leader becomes a thread of the this thread group.
+                 * Note: The old leader also uses this pid until release_task
                  *       is called.  Odd but simple and correct.
                  */
                 detach_pid(current, PIDTYPE_PID);
                 current->pid = leader->pid;
                 attach_pid(current, PIDTYPE_PID,  current->pid);
-                attach_pid(current, PIDTYPE_PGID, current->signal->pgrp);
-                attach_pid(current, PIDTYPE_SID,  current->signal->session);
+                transfer_pid(leader, current, PIDTYPE_PGID);
+                transfer_pid(leader, current, PIDTYPE_SID);
                 list_replace_rcu(&leader->tasks, &current->tasks);
 
                 current->group_leader = current;
                 leader->group_leader = current;
 
-                /* Reduce leader to a thread */
-                detach_pid(leader, PIDTYPE_PGID);
-                detach_pid(leader, PIDTYPE_SID);
-
                 current->exit_signal = SIGCHLD;
 
                 BUG_ON(leader->exit_state != EXIT_ZOMBIE);