QFSFileEngine: handle refreshing of file times better

Clear the known times when we write to it and always refresh for the
Access time.

Change-Id: I8d96dea9955d4c749b99fffd14cd6c03b4253197
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

src/corelib/io/qfsfileengine.cpp

@@ -524,6 +524,25 @@ bool QFSFileEngine::seek(qint64 pos)
     return d->nativeSeek(pos);
 }
 
+/*!
+    \reimp
+*/
+QDateTime QFSFileEngine::fileTime(FileTime time) const
+{
+    Q_D(const QFSFileEngine);
+
+    if (time == AccessTime) {
+        // always refresh for the access time
+        d->metaData.clearFlags(QFileSystemMetaData::AccessTime);
+    }
+
+    if (d->doStat(QFileSystemMetaData::Times))
+        return d->metaData.fileTime(time);
+
+    return QDateTime();
+}
+
+
 /*!
     \internal
 */
@@ -708,6 +727,7 @@ qint64 QFSFileEnginePrivate::readLineFdFh(char *data, qint64 maxlen)
 qint64 QFSFileEngine::write(const char *data, qint64 len)
 {
     Q_D(QFSFileEngine);
+    d->metaData.clearFlags(QFileSystemMetaData::Times);
 
     // On Windows' stdlib implementation, the results of calling fread and
     // fwrite are undefined if not called either in sequence, or if preceded

src/corelib/io/qfsfileengine_unix.cpp

@@ -699,16 +699,6 @@ bool QFSFileEngine::setFileTime(const QDateTime &newDate, FileTime time)
 #endif
 }
 
-QDateTime QFSFileEngine::fileTime(FileTime time) const
-{
-    Q_D(const QFSFileEngine);
-
-    if (d->doStat(QFileSystemMetaData::Times))
-        return d->metaData.fileTime(time);
-
-    return QDateTime();
-}
-
 uchar *QFSFileEnginePrivate::map(qint64 offset, qint64 size, QFile::MemoryMapFlags flags)
 {
 #if (defined(Q_OS_LINUX) || defined(Q_OS_ANDROID)) && Q_PROCESSOR_WORDSIZE == 4

src/corelib/io/qfsfileengine_win.cpp

@@ -947,16 +947,6 @@ bool QFSFileEngine::setFileTime(const QDateTime &newDate, FileTime time)
     return true;
 }
 
-QDateTime QFSFileEngine::fileTime(FileTime time) const
-{
-    Q_D(const QFSFileEngine);
-
-    if (d->doStat(QFileSystemMetaData::Times))
-        return d->metaData.fileTime(time);
-
-    return QDateTime();
-}
-
 uchar *QFSFileEnginePrivate::map(qint64 offset, qint64 size,
                                  QFile::MemoryMapFlags flags)
 {