@bbockelm commented on this pull request.

> @@ -2252,10 +2278,29 @@ int XrdOfs::rename(const char             *old_name,  // In
        evsObject->Notify(XrdOfsEvs::Mv, evInfo);
       }
 
+// If we cannot overwrite, we must open-exclusive first.  This will test whether
+// we will destroy data in the rename (without actually destroying data).
+//
+   std::unique_ptr<XrdSfsFile> tmp_fp = nullptr;
+   if (cannot_overwrite)
+      {tmp_fp.reset(newFile(einfo));
+       if (!tmp_fp)
+          {return fsError(einfo, ENOMEM);}
+       if (SFS_OK != tmp_fp->open(new_name, SFS_O_CREAT, 0700, client, infoN))

Latest commit changes to the suggested test-then-rename approach. Resolving conversation.

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