RW_ISWRITER
ASSERT(RW_ISWRITER(&so->so_fallback_rwlock));
(RW_ISWRITER(&ip->i_rwlock)) ||
if (RW_ISWRITER(&ip->i_rwlock) &&
(RW_ISWRITER(&ip->i_rwlock)))
ASSERT(RW_ISWRITER(&zp->z_acl_lock));
ASSERT(RW_ISWRITER(&zp->z_acl_lock));
ASSERT(RW_ISWRITER(&zp->z_acl_lock));