erasure: listOnlineDisks should return errFileNotFound for errReadQuorum. (#1573)

Fixes #1571

xl-erasure-v1-common.go

@@ -63,12 +63,13 @@ func (xl XL) listOnlineDisks(volume, path string) (onlineDisks []StorageAPI, mda
 	for _, err := range errs {
 		if err == errFileNotFound {
 			notFoundCount++
+			// If we have errors with file not found equal to the number of disks.
+			if notFoundCount > len(xl.storageDisks)-xl.readQuorum {
+				return nil, xlMetaV1{}, false, errFileNotFound
+			}
 		}
 	}
-	// If we have errors with file not found equal to the number of disks.
-	if notFoundCount == len(xl.storageDisks) {
-		return nil, xlMetaV1{}, false, errFileNotFound
-	}
+
 	highestVersion := int64(0)
 	onlineDisks = make([]StorageAPI, len(xl.storageDisks))
 	// List all the file versions from partsMetadata list.

xl-objects.go

@@ -191,11 +191,14 @@ func getMultipartObjectInfo(storage StorageAPI, bucket, object string) (info Mul
 	offset := int64(0)
 	r, err := storage.ReadFile(bucket, pathJoin(object, multipartMetaFile), offset)
 	if err != nil {
-		return
+		return MultipartObjectInfo{}, err
 	}
 	decoder := json.NewDecoder(r)
 	err = decoder.Decode(&info)
-	return
+	if err != nil {
+		return MultipartObjectInfo{}, err
+	}
+	return info, nil
 }
 
 // GetObjectInfo - get object info.