Introduce IDevice::bytesAvailable()

It's going to replace RemoteLinuxCheckForFreeDiskSpaceService.

Change-Id: If8c30a57b9013387c69412f12102bcd4d41a88b5
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/filepath.cpp

@@ -40,6 +40,7 @@
 #include <QFileInfo>
 #include <QOperatingSystemVersion>
 #include <QRegularExpression>
+#include <QStorageInfo>
 #include <QUrl>
 #include <qplatformdefs.h>
 
@@ -1421,6 +1422,16 @@ qint64 FilePath::fileSize() const
     return QFileInfo(m_data).size();
 }
 
+qint64 FilePath::bytesAvailable() const
+{
+    if (needsDevice()) {
+        QTC_ASSERT(s_deviceHooks.bytesAvailable, return false);
+        return s_deviceHooks.bytesAvailable(*this);
+    }
+    return QStorageInfo(m_data).bytesAvailable();
+}
+
+
 QTextStream &operator<<(QTextStream &s, const FilePath &fn)
 {
     return s << fn.toString();