DETACHED_MOUNT_COOKIE
hm->mount_cookie == DETACHED_MOUNT_COOKIE ?
if (hm->mount_cookie == DETACHED_MOUNT_COOKIE) {
hm->mount_cookie = DETACHED_MOUNT_COOKIE;
if (hm->mount_cookie == DETACHED_MOUNT_COOKIE)
if (hm->mount_cookie == DETACHED_MOUNT_COOKIE)