bad inode number: 0 and NFS

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I am looking at the "bad inode number: 0" problem. I am somewhat
puzzled by the following code from lookup_inode () in fs/nfsd/nfsfh.c:

                if (dirino == root_ino) {
                        dentry = dget(root);
                }
                else {
                        result = ERR_PTR(-ENOENT);
                        dir = iget_in_use(sb, dirino);
                        if (!dir)
                                goto out_root;
                        dentry = d_alloc_root(dir, NULL);
                        if (!dentry)
                                goto out_iput;
                }

                /*
                 * Get the name for this inode and the next parent inode.
                 */
                dirent.ino = ino;
                error = get_parent_ino(dentry, &dirent);
                result = ERR_PTR(error);
                dput(dentry);

If I am right, it calls d_alloc_root () with some non-root inode
to create a temporary dentry. Will that cause problem since that
dentry will map "/" to the inode which is not the root inode?

-- 
H.J. Lu (hjl@gnu.org)
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