[PATCH] add process_session() helper routine

Replace occurences of task->signal->session by a new process_session() helper
routine.

It will be useful for pid namespaces to abstract the session pid number.

Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Cc: Kirill Korotaev <dev@openvz.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 10 insertions, 9 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index fa0495e167e9..8d289bfc13d1 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -193,14 +193,14 @@ int session_of_pgrp(int pgrp)
 
         read_lock(&tasklist_lock);
         do_each_task_pid(pgrp, PIDTYPE_PGID, p) {
-                if (p->signal->session > 0) {
-                        sid = p->signal->session;
+                if (process_session(p) > 0) {
+                        sid = process_session(p);
                         goto out;
                 }
         } while_each_task_pid(pgrp, PIDTYPE_PGID, p);
         p = find_task_by_pid(pgrp);
         if (p)
-                sid = p->signal->session;
+                sid = process_session(p);
 out:
         read_unlock(&tasklist_lock);
         
@@ -225,8 +225,8 @@ static int will_become_orphaned_pgrp(int pgrp, struct task_struct *ignored_task)
                                 || p->exit_state
                                 || is_init(p->real_parent))
                         continue;
-                if (process_group(p->real_parent) != pgrp
-                            && p->real_parent->signal->session == p->signal->session) {
+                if (process_group(p->real_parent) != pgrp &&
+                    process_session(p->real_parent) == process_session(p)) {
                         ret = 0;
                         break;
                 }
@@ -302,7 +302,7 @@ void __set_special_pids(pid_t session, pid_t pgrp)
 {
         struct task_struct *curr = current->group_leader;
 
-        if (curr->signal->session != session) {
+        if (process_session(curr) != session) {
                 detach_pid(curr, PIDTYPE_SID);
                 curr->signal->session = session;
                 attach_pid(curr, PIDTYPE_SID, session);
@@ -647,10 +647,11 @@ reparent_thread(struct task_struct *p, struct task_struct *father, int traced)
          * outside, so the child pgrp is now orphaned.
          */
         if ((process_group(p) != process_group(father)) &&
-            (p->signal->session == father->signal->session)) {
+            (process_session(p) == process_session(father))) {
                 int pgrp = process_group(p);
 
-                if (will_become_orphaned_pgrp(pgrp, NULL) && has_stopped_jobs(pgrp)) {
+                if (will_become_orphaned_pgrp(pgrp, NULL) &&
+                    has_stopped_jobs(pgrp)) {
                         __kill_pg_info(SIGHUP, SEND_SIG_PRIV, pgrp);
                         __kill_pg_info(SIGCONT, SEND_SIG_PRIV, pgrp);
                 }
@@ -784,7 +785,7 @@ static void exit_notify(struct task_struct *tsk)
         t = tsk->real_parent;
         
         if ((process_group(t) != process_group(tsk)) &&
-            (t->signal->session == tsk->signal->session) &&
+            (process_session(t) == process_session(tsk)) &&
             will_become_orphaned_pgrp(process_group(tsk), tsk) &&
             has_stopped_jobs(process_group(tsk))) {
                 __kill_pg_info(SIGHUP, SEND_SIG_PRIV, process_group(tsk));