formatMetaV1 should be "inherited" by disk format structs (#6134)

cmd/format-xl.go

@@ -86,9 +86,10 @@ type formatXLV1 struct {
 // Represents the V2 backend disk structure version
 // under `.minio.sys` and actual data namespace.
 // formatXLV2 - structure holds format config version '2'.
+// The V2 format to support "large bucket" support where a bucket
+// can span multiple erasure sets.
 type formatXLV2 struct {
-	Version string `json:"version"`
+	formatMetaV1
-	Format  string `json:"format"`
 	XL struct {
 		Version string `json:"version"` // Version of 'xl' format.
 		This    string `json:"this"`    // This field carries assigned disk uuid.
@@ -107,8 +108,7 @@ type formatXLV2 struct {
 // In .minio.sys/multipart we have:
 // sha256(bucket/object)/uploadID/[xl.json, part.1, part.2 ....]
 type formatXLV3 struct {
-	Version string `json:"version"`
+	formatMetaV1
-	Format  string `json:"format"`
 	XL struct {
 		Version string `json:"version"` // Version of 'xl' format.
 		This    string `json:"this"`    // This field carries assigned disk uuid.

cmd/format-xl_test.go

@@ -345,8 +345,10 @@ func TestCheckFormatXLValue(t *testing.T) {
 		// Invalid XL format version "2".
 		{
 			&formatXLV3{
+				formatMetaV1: formatMetaV1{
 					Version: "2",
 					Format:  "XL",
+				},
 				XL: struct {
 					Version          string     `json:"version"`
 					This             string     `json:"this"`
@@ -361,8 +363,10 @@ func TestCheckFormatXLValue(t *testing.T) {
 		// Invalid XL format "Unknown".
 		{
 			&formatXLV3{
+				formatMetaV1: formatMetaV1{
 					Version: "1",
 					Format:  "Unknown",
+				},
 				XL: struct {
 					Version          string     `json:"version"`
 					This             string     `json:"this"`
@@ -377,8 +381,10 @@ func TestCheckFormatXLValue(t *testing.T) {
 		// Invalid XL format version "0".
 		{
 			&formatXLV3{
+				formatMetaV1: formatMetaV1{
 					Version: "1",
 					Format:  "XL",
+				},
 				XL: struct {
 					Version          string     `json:"version"`
 					This             string     `json:"this"`