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authorOleg Nesterov <oleg@redhat.com>2009-04-02 16:58:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-02 19:05:00 -0700
commit5dfc80be73dd0c212d2e6dd8dbf5afa07e680bbe (patch)
treeac173fb3fcfe2970781591f620f22d30f4ce090c
parent39c626ae47c469abdfd30c6e42eff884931380d6 (diff)
forget_original_parent: do not abuse child->ptrace_entry
By discussion with Roland. - Use ->sibling instead of ->ptrace_entry to chain the need to be release_task'd childs. Nobody else can use ->sibling, this task is EXIT_DEAD and nobody can find it on its own list. - rename ptrace_dead to dead_childs. - Now that we don't have the "parallel" untrace code, change back reparent_thread() to return void, pass dead_childs as an argument. Actually, I don't understand why do we notify /sbin/init when we reparent a zombie, probably it is better to reap it unconditionally. [akpm@linux-foundation.org: s/childs/children/] Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: "Metzger, Markus T" <markus.t.metzger@intel.com> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/exit.c87
1 files changed, 41 insertions, 46 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 506693dfdd4..029415d9f82 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -726,46 +726,6 @@ static void exit_mm(struct task_struct * tsk)
mmput(mm);
}
-/* Returns nonzero if the child should be released. */
-static int reparent_thread(struct task_struct *p, struct task_struct *father)
-{
- int dead;
-
- if (p->pdeath_signal)
- /* We already hold the tasklist_lock here. */
- group_send_sig_info(p->pdeath_signal, SEND_SIG_NOINFO, p);
-
- list_move_tail(&p->sibling, &p->real_parent->children);
-
- if (task_detached(p))
- return 0;
- /* If this is a threaded reparent there is no need to
- * notify anyone anything has happened.
- */
- if (same_thread_group(p->real_parent, father))
- return 0;
-
- /* We don't want people slaying init. */
- p->exit_signal = SIGCHLD;
-
- /* If we'd notified the old parent about this child's death,
- * also notify the new parent.
- */
- dead = 0;
- if (!p->ptrace &&
- p->exit_state == EXIT_ZOMBIE && thread_group_empty(p)) {
- do_notify_parent(p, p->exit_signal);
- if (task_detached(p)) {
- p->exit_state = EXIT_DEAD;
- dead = 1;
- }
- }
-
- kill_orphaned_pgrp(p, father);
-
- return dead;
-}
-
/*
* When we die, we re-parent all our children.
* Try to give them to another thread in our thread
@@ -805,10 +765,46 @@ static struct task_struct *find_new_reaper(struct task_struct *father)
return pid_ns->child_reaper;
}
+/*
+* Any that need to be release_task'd are put on the @dead list.
+ */
+static void reparent_thread(struct task_struct *father, struct task_struct *p,
+ struct list_head *dead)
+{
+ if (p->pdeath_signal)
+ group_send_sig_info(p->pdeath_signal, SEND_SIG_NOINFO, p);
+
+ list_move_tail(&p->sibling, &p->real_parent->children);
+
+ if (task_detached(p))
+ return;
+ /*
+ * If this is a threaded reparent there is no need to
+ * notify anyone anything has happened.
+ */
+ if (same_thread_group(p->real_parent, father))
+ return;
+
+ /* We don't want people slaying init. */
+ p->exit_signal = SIGCHLD;
+
+ /* If it has exited notify the new parent about this child's death. */
+ if (!p->ptrace &&
+ p->exit_state == EXIT_ZOMBIE && thread_group_empty(p)) {
+ do_notify_parent(p, p->exit_signal);
+ if (task_detached(p)) {
+ p->exit_state = EXIT_DEAD;
+ list_move_tail(&p->sibling, dead);
+ }
+ }
+
+ kill_orphaned_pgrp(p, father);
+}
+
static void forget_original_parent(struct task_struct *father)
{
struct task_struct *p, *n, *reaper;
- LIST_HEAD(ptrace_dead);
+ LIST_HEAD(dead_children);
exit_ptrace(father);
@@ -821,15 +817,14 @@ static void forget_original_parent(struct task_struct *father)
BUG_ON(p->ptrace);
p->parent = p->real_parent;
}
- if (reparent_thread(p, father))
- list_add(&p->ptrace_entry, &ptrace_dead);;
+ reparent_thread(father, p, &dead_children);
}
-
write_unlock_irq(&tasklist_lock);
+
BUG_ON(!list_empty(&father->children));
- list_for_each_entry_safe(p, n, &ptrace_dead, ptrace_entry) {
- list_del_init(&p->ptrace_entry);
+ list_for_each_entry_safe(p, n, &dead_children, sibling) {
+ list_del_init(&p->sibling);
release_task(p);
}
}