get_aligned_page
psize = get_aligned_page(size + PAGE_SIZE -1);
page = get_aligned_page(offset);
page = get_aligned_page(offset);
blk->first_page = get_aligned_page(blk->mem.offset);
blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1);
psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1);