vdo_pack_block_map_entry
vdo_pack_block_map_entry(forest->map->root_origin + root,
vdo_pack_block_map_entry(pbn, mapping_state);
.mapping = vdo_pack_block_map_entry(entry->mapping.pbn,
.unmapping = vdo_pack_block_map_entry(entry->unmapping.pbn,
.block_map_entry = vdo_pack_block_map_entry(entry.mapping.pbn,
.block_map_entry = vdo_pack_block_map_entry(entry.mapping.pbn,