QFile::rename: use the open file's ID, instead of using the file name

To do that, we needed to add virtual id() in QAbstractFileEngine and
override it in QFSFileEngine. It might be useful to return other types
of IDs for the other file engines, but this commit does not attempt that
just yet.

Change-Id: I1eba2b016de74620bfc8fffd14ccafe0762b3c38
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/corelib/io/qfilesystemengine_p.h b/src/corelib/io/qfilesystemengine_p.h
index 196ed8df69..e3e52f6eaa 100644
--- a/src/corelib/io/qfilesystemengine_p.h
+++ b/src/corelib/io/qfilesystemengine_p.h
@@ -92,6 +92,7 @@ public:
                              QFileSystemMetaData::MetaDataFlags what);
 #if defined(Q_OS_UNIX)
     static bool fillMetaData(int fd, QFileSystemMetaData &data); // what = PosixStatFlags
+    static QByteArray id(int fd);
     static bool setPermissions(int fd, QFile::Permissions permissions, QSystemError &error,
                                QFileSystemMetaData *data = nullptr);
 #endif
@@ -104,6 +105,7 @@ public:
                              QFileSystemMetaData::MetaDataFlags what);
     static bool fillPermissions(const QFileSystemEntry &entry, QFileSystemMetaData &data,
                                 QFileSystemMetaData::MetaDataFlags what);
+    static QByteArray id(HANDLE fHandle);
     static QString owner(const QFileSystemEntry &entry, QAbstractFileEngine::FileOwner own);
     static QString nativeAbsoluteFilePath(const QString &path);
 #endif