nilfs_iget
return d_obtain_alias(nilfs_iget(child->d_sb, root, ino));
inode = nilfs_iget(sb, root, ino);
inode = nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino);
struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
inode = nilfs_iget(sb, root, rb->ino);
inode = nilfs_iget(sb, root, NILFS_ROOT_INO);