hugetlbfs_get_inode
inode = hugetlbfs_get_inode(dir->i_sb, idmap, dir, mode | S_IFREG, 0);
inode = hugetlbfs_get_inode(dir->i_sb, idmap, dir, mode, 0);
inode = hugetlbfs_get_inode(mnt->mnt_sb, &nop_mnt_idmap, NULL,
inode = hugetlbfs_get_inode(dir->i_sb, idmap, dir, mode, dev);