get_page_buffer
struct block_map_page *page = (struct block_map_page *) get_page_buffer(info);
*page_ptr = (struct block_map_page *) get_page_buffer(vpc->info);
get_page_buffer(info), &info->vio);
page = (const struct block_map_page *) get_page_buffer(vpc->info);
vdo_update_block_map_page((struct block_map_page *) get_page_buffer(info),
page = (struct block_map_page *) get_page_buffer(info);
memset(get_page_buffer(info), 0, VDO_BLOCK_SIZE);