Add object parity in listing V2M and listing versions M (#17238)

cmd/api-response.go

@@ -345,6 +345,13 @@ func (s *Metadata) MarshalXML(e *xxml.Encoder, start xxml.StartElement) error {
 	return e.EncodeToken(start.End())
 }
 
+// ObjectInternalInfo contains some internal information about a given
+// object, it will printed in listing calls with enabled metadata.
+type ObjectInternalInfo struct {
+	K int // Data blocks
+	M int // Parity blocks
+}
+
 // Object container for object metadata
 type Object struct {
 	Key          string
@@ -361,6 +368,8 @@ type Object struct {
 	// UserMetadata user-defined metadata
 	UserMetadata *Metadata `xml:"UserMetadata,omitempty"`
 	UserTags     string    `xml:"UserTags,omitempty"`
+
+	Internal *ObjectInternalInfo `xml:"Internal,omitempty"`
 }
 
 // CopyObjectResponse container returns ETag and LastModified of the successfully copied object
@@ -552,6 +561,10 @@ func generateListVersionsResponse(bucket, prefix, marker, versionIDMarker, delim
 				}
 				content.UserMetadata.Set(k, v)
 			}
+			content.Internal = &ObjectInternalInfo{
+				K: object.DataBlocks,
+				M: object.ParityBlocks,
+			}
 		}
 		content.Owner = owner
 		content.VersionID = object.VersionID
@@ -687,6 +700,10 @@ func generateListObjectsV2Response(bucket, prefix, token, nextToken, startAfter,
 					}
 					content.UserMetadata.Set(k, v)
 				}
+				content.Internal = &ObjectInternalInfo{
+					K: object.DataBlocks,
+					M: object.ParityBlocks,
+				}
 			}
 		}
 		contents = append(contents, content)

cmd/erasure-metadata.go

@@ -158,6 +158,8 @@ func (fi FileInfo) ToObjectInfo(bucket, object string, versioned bool) ObjectInf
 		IsDir:            HasSuffix(object, SlashSeparator),
 		Bucket:           bucket,
 		Name:             object,
+		ParityBlocks:     fi.Erasure.ParityBlocks,
+		DataBlocks:       fi.Erasure.DataBlocks,
 		VersionID:        versionID,
 		IsLatest:         fi.IsLatest,
 		DeleteMarker:     fi.Deleted,

cmd/object-api-datatypes.go

@@ -196,6 +196,9 @@ type ObjectInfo struct {
 
 	// Inlined
 	Inlined bool
+
+	DataBlocks   int
+	ParityBlocks int
 }
 
 // ArchiveInfo returns any saved zip archive meta information.