Isolate some explicit usage of task->tgid

[linux-2.6-block.git] / fs / exec.c

diff --git a/fs/exec.c b/fs/exec.c
index c6e91c3dc2a1e9dd0bbc70edf1eca05594489324..2c942e2d14ea2b3ebf2fb51bcf692e3a37565ae5 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -64,7 +64,6 @@ int core_uses_pid;
 char core_pattern[CORENAME_MAX_SIZE] = "core";
 int suid_dumpable = 0;
 
-EXPORT_SYMBOL(suid_dumpable);
 /* The maximal length of core_pattern is also specified in sysctl.c */
 
 static LIST_HEAD(formats);
@@ -235,7 +234,7 @@ static int __bprm_mm_init(struct linux_binprm *bprm)
        vma->vm_start = vma->vm_end - PAGE_SIZE;
 
        vma->vm_flags = VM_STACK_FLAGS;
-       vma->vm_page_prot = protection_map[vma->vm_flags & 0x7];
+       vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
        err = insert_vm_struct(mm, vma);
        if (err) {
                up_write(&mm->mmap_sem);
@@ -752,15 +751,6 @@ static int de_thread(struct task_struct *tsk)
        struct task_struct *leader = NULL;
        int count;
 
-       /*
-        * If we don't share sighandlers, then we aren't sharing anything
-        * and we can just re-use it all.
-        */
-       if (atomic_read(&oldsighand->count) <= 1) {
-               exit_itimers(sig);
-               return 0;
-       }
-
        if (thread_group_empty(tsk))
                goto no_thread_group;
 
@@ -785,8 +775,8 @@ static int de_thread(struct task_struct *tsk)
         * Reparenting needs write_lock on tasklist_lock,
         * so it is safe to do it under read_lock.
         */
-       if (unlikely(tsk->group_leader == child_reaper(tsk)))
-               tsk->nsproxy->pid_ns->child_reaper = tsk;
+       if (unlikely(tsk->group_leader == task_child_reaper(tsk)))
+               task_active_pid_ns(tsk)->child_reaper = tsk;
 
        zap_other_threads(tsk);
        read_unlock(&tasklist_lock);
@@ -810,16 +800,15 @@ static int de_thread(struct task_struct *tsk)
                        hrtimer_restart(&sig->real_timer);
                spin_lock_irq(lock);
        }
+
+       sig->notify_count = count;
+       sig->group_exit_task = tsk;
        while (atomic_read(&sig->count) > count) {
-               sig->group_exit_task = tsk;
-               sig->notify_count = count;
                __set_current_state(TASK_UNINTERRUPTIBLE);
                spin_unlock_irq(lock);
                schedule();
                spin_lock_irq(lock);
        }
-       sig->group_exit_task = NULL;
-       sig->notify_count = 0;
        spin_unlock_irq(lock);
 
        /*
@@ -828,14 +817,17 @@ static int de_thread(struct task_struct *tsk)
         * and to assume its PID:
         */
        if (!thread_group_leader(tsk)) {
-               /*
-                * Wait for the thread group leader to be a zombie.
-                * It should already be zombie at this point, most
-                * of the time.
-                */
                leader = tsk->group_leader;
-               while (leader->exit_state != EXIT_ZOMBIE)
-                       yield();
+
+               sig->notify_count = -1;
+               for (;;) {
+                       write_lock_irq(&tasklist_lock);
+                       if (likely(leader->exit_state))
+                               break;
+                       __set_current_state(TASK_UNINTERRUPTIBLE);
+                       write_unlock_irq(&tasklist_lock);
+                       schedule();
+               }
 
                /*
                 * The only record we have of the real-time age of a
@@ -849,10 +841,8 @@ static int de_thread(struct task_struct *tsk)
                 */
                tsk->start_time = leader->start_time;
 
-               write_lock_irq(&tasklist_lock);
-
-               BUG_ON(leader->tgid != tsk->tgid);
-               BUG_ON(tsk->pid == tsk->tgid);
+               BUG_ON(!same_thread_group(leader, tsk));
+               BUG_ON(has_group_leader_pid(tsk));
                /*
                 * An exec() starts a new thread group with the
                 * TGID of the previous thread group. Rehash the
@@ -867,7 +857,7 @@ static int de_thread(struct task_struct *tsk)
                 */
                detach_pid(tsk, PIDTYPE_PID);
                tsk->pid = leader->pid;
-               attach_pid(tsk, PIDTYPE_PID,  find_pid(tsk->pid));
+               attach_pid(tsk, PIDTYPE_PID,  task_pid(leader));
                transfer_pid(leader, tsk, PIDTYPE_PGID);
                transfer_pid(leader, tsk, PIDTYPE_SID);
                list_replace_rcu(&leader->tasks, &tsk->tasks);
@@ -883,6 +873,8 @@ static int de_thread(struct task_struct *tsk)
                write_unlock_irq(&tasklist_lock);
         }
 
+       sig->group_exit_task = NULL;
+       sig->notify_count = 0;
        /*
         * There may be one thread left which is just exiting,
         * but it's safe to stop telling the group to kill themselves.
@@ -1441,7 +1433,7 @@ static int format_corename(char *corename, const char *pattern, long signr)
                        case 'p':
                                pid_in_pattern = 1;
                                rc = snprintf(out_ptr, out_end - out_ptr,
-                                             "%d", current->tgid);
+                                             "%d", task_tgid_vnr(current));
                                if (rc > out_end - out_ptr)
                                        goto out;
                                out_ptr += rc;
@@ -1521,7 +1513,7 @@ static int format_corename(char *corename, const char *pattern, long signr)
        if (!ispipe && !pid_in_pattern
             && (core_uses_pid || atomic_read(&current->mm->mm_users) != 1)) {
                rc = snprintf(out_ptr, out_end - out_ptr,
-                             ".%d", current->tgid);
+                             ".%d", task_tgid_vnr(current));
                if (rc > out_end - out_ptr)
                        goto out;
                out_ptr += rc;
@@ -1669,7 +1661,6 @@ void set_dumpable(struct mm_struct *mm, int value)
                break;
        }
 }
-EXPORT_SYMBOL_GPL(set_dumpable);
 
 int get_dumpable(struct mm_struct *mm)
 {