1 diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
2 index cd01c4a..0aefa8e 100644
5 @@ -1663,6 +1663,32 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
6 return ERR_PTR(-EPERM);
9 + /* ".." shouldn't go into dcache to preserve dcache hierarchy
10 + * otherwise we'll get parent being a child of actual child.
11 + * see bug 10458 for details -bzzz */
12 + if (inode && (dentry->d_name.name[0] == '.' &&
13 + (dentry->d_name.len == 1 || (dentry->d_name.len == 2 &&
14 + dentry->d_name.name[1] == '.')))) {
15 + struct dentry *goal = NULL;
17 + /* first, look for an existing dentry - any one is good */
18 + goal = d_find_any_alias(inode);
20 + spin_lock(&dentry->d_lock);
21 + /* there is no alias, we need to make current dentry:
22 + * a) inaccessible for __d_lookup()
23 + * b) inaccessible for iopen */
24 + J_ASSERT(hlist_unhashed(&dentry->d_u.d_alias));
25 + dentry->d_flags |= DCACHE_NFSFS_RENAMED;
26 + /* this is d_instantiate() ... */
27 + hlist_add_head(&dentry->d_u.d_alias, &inode->i_dentry);
28 + dentry->d_inode = inode;
29 + spin_unlock(&dentry->d_lock);
37 if (!inode && IS_CASEFOLDED(dir)) {