FSCACHE_COOKIE_NEEDS_UPDATE
if (test_and_clear_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &object->cookie->flags))
set_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &object->cookie->flags);
set_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &object->cookie->flags);
clear_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &cookie->flags);
set_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &cookie->flags);
set_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &cookie->flags);