? .directory
? drupal-818818-37-D7.patch
? drupal-818818-41-D7.patch
Index: includes/file.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/file.inc,v
retrieving revision 1.239
diff -u -p -r1.239 file.inc
--- includes/file.inc	21 Oct 2010 12:09:41 -0000	1.239
+++ includes/file.inc	16 Nov 2010 03:22:01 -0000
@@ -881,8 +881,36 @@ function file_unmanaged_copy($source, $d
   }
   // Make sure the .htaccess files are present.
   file_ensure_htaccess();
+
+  // Perform the replace operation. Since there could be multiple processes
+  // writing to the same file, the best option is to create a temporary file in
+  // the same directory and then rename it to the destination. A temporary file
+  // is needed if the directory is mounted on a separate machine; thus ensuring
+  // the rename command stays local.
+  $result = FALSE;
+  if ($replace == FILE_EXISTS_REPLACE) {
+    // Get a temporary filename in the destination directory.
+    $temporary_file = drupal_tempnam(drupal_dirname($destination), 'file');
+    // Place contents in the temporary file.
+    if ($temporary_file && @copy($source, $temporary_file)) {
+      if (!$result = @rename($temporary_file, $destination)) {
+        // Unlink and try again for windows. Rename on windows does not replace
+        // the file if it already exists.
+        @unlink($destination);
+        $result = @rename($temporary_file, $destination);
+      }
+      // Remove temporary_file if rename failed.
+      if (!$result) {
+        @unlink($temporary_file);
+      }
+    }
+  }
+
   // Perform the copy operation.
-  if (!@copy($source, $destination)) {
+  else {
+    $result = @copy($source, $destination);
+  }
+  if ($result === FALSE) {
     watchdog('file', 'The specified file %file could not be copied to %destination.', array('%file' => $source, '%destination' => drupal_realpath($destination)), WATCHDOG_ERROR);
     return FALSE;
   }