From 154f1673e98748837c7c0dfcf3a19398427306ef Mon Sep 17 00:00:00 2001
From: Felix Geyer <debfx@fobos.de>
Date: Mon, 13 Jul 2015 20:49:17 +0200
Subject: [PATCH] QSaveFile: Flush temporary file and fsync before renaming.

Closes #301
---
 src/core/qsavefile.cpp | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/core/qsavefile.cpp b/src/core/qsavefile.cpp
index bddf18c97..287f9e8e2 100644
--- a/src/core/qsavefile.cpp
+++ b/src/core/qsavefile.cpp
@@ -46,6 +46,12 @@
 #include <QFileInfo>
 #include <QTemporaryFile>
 
+#ifdef Q_OS_WIN
+#  include <windows.h>
+#else
+#  include <unistd.h>
+#endif
+
 QSaveFilePrivate::QSaveFilePrivate()
     : tempFile(0), error(QFile::NoError)
 {
@@ -283,7 +289,15 @@ bool QSaveFile::commit()
         qWarning("QSaveFile::commit: File (%s) is not open", qPrintable(fileName()));
         return false;
     }
-    QIODevice::close(); // flush and close
+    flush();
+#ifdef Q_OS_WIN
+    FlushFileBuffers(reinterpret_cast<HANDLE>(handle()));
+#elif defined(_POSIX_SYNCHRONIZED_IO) && _POSIX_SYNCHRONIZED_IO > 0
+    fdatasync(d->tempFile->handle());
+#else
+    fsync(d->tempFile->handle());
+#endif
+    QIODevice::close();
     if (d->error != QFile::NoError) {
         d->tempFile->remove();
         unsetError();