Make sure we don't cache old file sizes prior to new writes

If we write to a file, its size changes. We should drop previous size
caches.

Change-Id: Ib687c91e5fc88cab588c89023f23da9622160da9
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/corelib/io/qfsfileengine.cpp b/src/corelib/io/qfsfileengine.cpp
index 998a3334c9..1ae182a4c1 100644
--- a/src/corelib/io/qfsfileengine.cpp
+++ b/src/corelib/io/qfsfileengine.cpp
@@ -742,6 +742,9 @@ qint64 QFSFileEnginePrivate::writeFdFh(const char *data, qint64 len)
     if (len &&  writtenBytes == 0) {
         writtenBytes = -1;
         q->setError(errno == ENOSPC ? QFile::ResourceError : QFile::WriteError, qt_error_string(errno));
+    } else {
+        // reset the cached size, if any
+        metaData.clearFlags(QFileSystemMetaData::SizeAttribute);
     }
 
     return writtenBytes;