Merge branch '4.6' of scm.dev.nokia.troll.no:qt/qt-s60-public into 4.6-integration

* '4.6' of scm.dev.nokia.troll.no:qt/qt-s60-public:
  Symbian file system use optimisation for stat and symlinks

1 files changed, 10 insertions, 0 deletions

diff --git a/src/corelib/io/qfsfileengine_unix.cpp b/src/corelib/io/qfsfileengine_unix.cpp
index d2fa744..1331f54 100644
--- a/src/corelib/io/qfsfileengine_unix.cpp
+++ b/src/corelib/io/qfsfileengine_unix.cpp
@@ -668,6 +668,16 @@ bool QFSFileEnginePrivate::doStat() const
             could_stat = (QT_FSTAT(QT_FILENO(fh), &st) == 0);
         } else if (fd == -1) {
             // ### actually covers two cases: d->fh and when the file is not open
+#if defined(Q_OS_SYMBIAN)
+            // Optimisation for Symbian where fileFlags() calls both doStat() and isSymlink(), but rarely on real links.
+            // When the filename is not a link, lstat will return the same info as stat, but this also removes
+            // any need for a further call to lstat to check if the file is a link.
+            need_lstat = false;
+            could_stat = (QT_LSTAT(nativeFilePath.constData(), &st) == 0);
+            is_link = could_stat ? S_ISLNK(st.st_mode) : false;
+            // if it turns out this was a link, we can call stat too.
+            if (is_link)
+#endif
             could_stat = (QT_STAT(nativeFilePath.constData(), &st) == 0);
         } else {
             could_stat = (QT_FSTAT(fd, &st) == 0);