recover_slot
.recover_slot = recover_slot,
if (!ls->ls_ops || !ls->ls_ops->recover_slot)
ls->ls_ops->recover_slot(ls->ls_ops_arg, &slot);
.recover_slot = gdlm_recover_slot,
.recover_slot = user_recover_slot,
void (*recover_slot) (void *ops_arg, struct dlm_slot *slot);