zfs_grab_sa_handle
error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG);
error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG);
error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);