zfsdev_get_soft_state
extern void *zfsdev_get_soft_state(minor_t minor,
zo = zfsdev_get_soft_state(minor, ZSST_CTLDEV);
zfsdev_get_soft_state(minor, ZSST_CTLDEV) == NULL)
*zo = zfsdev_get_soft_state(minor, ZSST_CTLDEV);
zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL);
zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL);
zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);