MOS
grub_memmove(MOS, &osp->os_meta_dnode, DNODE_SIZE);
if (errnum = get_objset_mdn(MOS, NULL, NULL, mdn, stack))
if (errnum = get_default_bootfsobj(MOS,
if (errnum = get_objset_mdn(MOS, NULL,
if (errnum = get_objset_mdn(MOS, current_bootfs,
#define DNODE (MOS+1) /* move sizeof(dnode_phys_t) bytes */