zil_open
VERIFY(zil_open(os, ztest_get_data) == zd->zd_zilog);
zilog = zil_open(os, ztest_get_data);
zilog = zil_open(os, ztest_get_data);
extern zilog_t *zil_open(objset_t *os, zil_get_data_t *get_data);
zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data);
zv->zv_zilog = zil_open(os, zvol_get_data);