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diff --git a/src/corelib/io/qfilesystemengine.cpp b/src/corelib/io/qfilesystemengine.cpp
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+++ b/src/corelib/io/qfilesystemengine.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qfilesystemengine_p.h"
+#include <QtCore/qdir.h>
+#include <QtCore/qset.h>
+
+/*!
+    \internal
+
+    Returns the canonicalized form of \a path (i.e., with all symlinks
+    resolved, and all redundant path elements removed.
+*/
+QString QFileSystemEngine::slowCanonicalized(const QString &path)
+{
+    if (path.isEmpty())
+        return path;
+
+    QFileInfo fi;
+    const QChar slash(QLatin1Char('/'));
+    QString tmpPath = path;
+    int separatorPos = 0;
+    QSet<QString> nonSymlinks;
+    QSet<QString> known;
+
+    known.insert(path);
+    do {
+#ifdef Q_OS_WIN
+        if (separatorPos == 0) {
+            if (tmpPath.size() >= 2 && tmpPath.at(0) == slash && tmpPath.at(1) == slash) {
+                // UNC, skip past the first two elements
+                separatorPos = tmpPath.indexOf(slash, 2);
+            } else if (tmpPath.size() >= 3 && tmpPath.at(1) == QLatin1Char(':') && tmpPath.at(2) == slash) {
+                // volume root, skip since it can not be a symlink
+                separatorPos = 2;
+            }
+        }
+        if (separatorPos != -1)
+#endif
+        separatorPos = tmpPath.indexOf(slash, separatorPos + 1);
+        QString prefix = separatorPos == -1 ? tmpPath : tmpPath.left(separatorPos);
+        if (
+#ifdef Q_OS_SYMBIAN
+            // Symbian doesn't support directory symlinks, so do not check for link unless we
+            // are handling the last path element. This not only slightly improves performance,
+            // but also saves us from lot of unnecessary platform security check failures
+            // when dealing with files under *:/private directories.
+            separatorPos == -1 &&
+#endif
+            !nonSymlinks.contains(prefix)) {
+            fi.setFile(prefix);
+            if (fi.isSymLink()) {
+                QString target = fi.symLinkTarget();
+                if(QFileInfo(target).isRelative())
+                    target = fi.absolutePath() + slash + target;
+                if (separatorPos != -1) {
+                    if (fi.isDir() && !target.endsWith(slash))
+                        target.append(slash);
+                    target.append(tmpPath.mid(separatorPos));
+                }
+                tmpPath = QDir::cleanPath(target);
+                separatorPos = 0;
+
+                if (known.contains(tmpPath))
+                    return QString();
+                known.insert(tmpPath);
+            } else {
+                nonSymlinks.insert(prefix);
+            }
+        }
+    } while (separatorPos != -1);
+
+    return QDir::cleanPath(tmpPath);
+}
+