do not use dataDir to reference inline data use versionID (#11942)

versionID is the one that needs to be preserved and as
well as overwritten in case of replication, transition
etc - dataDir is an ephemeral entity that changes
during overwrites - make sure that versionID is used
to save the object content.

this would break things if you are already running
the latest master, please wipe your current content
and re-do your setup after this change.

cmd/xl-storage-format-utils.go

@@ -83,7 +83,17 @@ func getFileInfo(xlMetaBuf []byte, volume, path, versionID string, data bool) (F
 		if !data || err != nil {
 			return fi, err
 		}
-		fi.Data = xlMeta.data.find(fi.DataDir)
+		versionID := fi.VersionID
+		if versionID == "" {
+			versionID = nullVersionID
+		}
+		fi.Data = xlMeta.data.find(versionID)
+		if len(fi.Data) == 0 {
+			// PR #11758 used DataDir, preserve it
+			// for users who might have used master
+			// branch
+			fi.Data = xlMeta.data.find(fi.DataDir)
+		}
 		return fi, nil
 	}