pidns: add reboot_pid_ns() to handle the reboot syscall
[linux-2.6.git] / kernel / pid_namespace.c
index 17b2328..57bc1fd 100644 (file)
@@ -15,6 +15,7 @@
 #include <linux/acct.h>
 #include <linux/slab.h>
 #include <linux/proc_fs.h>
+#include <linux/reboot.h>
 
 #define BITS_PER_PAGE          (PAGE_SIZE*8)
 
@@ -183,6 +184,9 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
                rc = sys_wait4(-1, NULL, __WALL, NULL);
        } while (rc != -ECHILD);
 
+       if (pid_ns->reboot)
+               current->signal->group_exit_code = pid_ns->reboot;
+
        acct_exit_ns(pid_ns);
        return;
 }
@@ -217,6 +221,35 @@ static struct ctl_table pid_ns_ctl_table[] = {
 
 static struct ctl_path kern_path[] = { { .procname = "kernel", }, { } };
 
+int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
+{
+       if (pid_ns == &init_pid_ns)
+               return 0;
+
+       switch (cmd) {
+       case LINUX_REBOOT_CMD_RESTART2:
+       case LINUX_REBOOT_CMD_RESTART:
+               pid_ns->reboot = SIGHUP;
+               break;
+
+       case LINUX_REBOOT_CMD_POWER_OFF:
+       case LINUX_REBOOT_CMD_HALT:
+               pid_ns->reboot = SIGINT;
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       read_lock(&tasklist_lock);
+       force_sig(SIGKILL, pid_ns->child_reaper);
+       read_unlock(&tasklist_lock);
+
+       do_exit(0);
+
+       /* Not reached */
+       return 0;
+}
+
 static __init int pid_namespaces_init(void)
 {
        pid_ns_cachep = KMEM_CACHE(pid_namespace, SLAB_PANIC);