--- /dev/null
+Index: linux-stage/fs/ext4/namei.c
+===================================================================
+--- linux-stage.orig/fs/ext4/namei.c 2009-08-10 22:44:33.000000000 +0800
++++ linux-stage/fs/ext4/namei.c 2009-08-10 22:48:22.000000000 +0800
+@@ -1493,6 +1493,72 @@
+ return add_dirent_to_buf(handle, dentry, inode, de, bh);
+ }
+
++/* update ".." for hash-indexed directory, split the item "." if necessary */
++static int ext4_update_dotdot(handle_t *handle, struct dentry *dentry,
++ struct inode *inode)
++{
++ struct inode * dir = dentry->d_parent->d_inode;
++ struct buffer_head * dir_block;
++ struct ext4_dir_entry_2 * de;
++ int len, journal = 0, err = 0;
++
++ if (IS_ERR(handle))
++ return PTR_ERR(handle);
++
++ if (IS_DIRSYNC(dir))
++ handle->h_sync = 1;
++
++ dir_block = ext4_bread(handle, dir, 0, 0, &err);
++ if (!dir_block)
++ goto out;
++
++ de = (struct ext4_dir_entry_2 *)dir_block->b_data;
++ /* the first item must be "." */
++ assert(de->name_len == 1 && de->name[0] == '.');
++ len = le16_to_cpu(de->rec_len);
++ assert(len >= EXT4_DIR_REC_LEN(1));
++ if (len > EXT4_DIR_REC_LEN(1)) {
++ BUFFER_TRACE(dir_block, "get_write_access");
++ err = ext4_journal_get_write_access(handle, dir_block);
++ if (err)
++ goto out_journal;
++
++ journal = 1;
++ de->rec_len = cpu_to_le16(EXT4_DIR_REC_LEN(1));
++ }
++
++ len -= EXT4_DIR_REC_LEN(1);
++ assert(len == 0 || len >= EXT4_DIR_REC_LEN(2));
++ de = (struct ext4_dir_entry_2 *)
++ ((char *) de + le16_to_cpu(de->rec_len));
++ if (!journal) {
++ BUFFER_TRACE(dir_block, "get_write_access");
++ err = ext4_journal_get_write_access(handle, dir_block);
++ if (err)
++ goto out_journal;
++ }
++
++ de->inode = cpu_to_le32(inode->i_ino);
++ if (len > 0)
++ de->rec_len = cpu_to_le16(len);
++ else
++ assert(le16_to_cpu(de->rec_len) >= EXT4_DIR_REC_LEN(2));
++ de->name_len = 2;
++ strcpy (de->name, "..");
++ ext4_set_de_type(dir->i_sb, de, S_IFDIR);
++
++out_journal:
++ if (journal) {
++ BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata");
++ err = ext4_handle_dirty_metadata(handle, dir, dir_block);
++ ext4_mark_inode_dirty(handle, dir);
++ }
++ brelse (dir_block);
++
++out:
++ return err;
++}
++
+ /*
+ * ext4_add_entry()
+ *
+@@ -1521,6 +1587,9 @@
+ if (!dentry->d_name.len)
+ return -EINVAL;
+ if (is_dx(dir)) {
++ if (dentry->d_name.len == 2 &&
++ memcmp(dentry->d_name.name, "..", 2) == 0)
++ return ext4_update_dotdot(handle, dentry, inode);
+ retval = ext4_dx_add_entry(handle, dentry, inode);
+ if (!retval || (retval != ERR_BAD_DX_DIR))
+ return retval;