EXT4_PG_TO_LBLK
block = EXT4_PG_TO_LBLK(inode, folio->index);
lblk = EXT4_PG_TO_LBLK(inode, folio->index);
lblk = EXT4_PG_TO_LBLK(mpd->inode, folio->index);
iblock = EXT4_PG_TO_LBLK(inode, folio->index);
first_group = EXT4_PG_TO_LBLK(inode, folio->index) / 2;
first_block = EXT4_PG_TO_LBLK(inode, folio->index);
block_in_file = next_block = EXT4_PG_TO_LBLK(inode, folio->index);
last_block = EXT4_PG_TO_LBLK(inode, folio->index + nr_pages);