Remove partName, partETag requirement (#9044)

This is a precursor change before versioning,
removes/deprecates the requirement of remembering
partName and partETag which are not useful after
a multipart transaction has finished.

This PR reduces the overall size of the backend
JSON for large file uploads.

cmd/xl-v1-healing-common.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"context"
+	"fmt"
 	"time"
 
 	"github.com/minio/minio/cmd/logger"
@@ -181,8 +182,9 @@ func disksWithAllParts(ctx context.Context, onlineDisks []StorageAPI, partsMetad
 			// parts. This is considered an outdated disk, since
 			// it needs healing too.
 			for _, part := range partsMetadata[i].Parts {
-				checksumInfo := erasureInfo.GetChecksumInfo(part.Name)
-				err = onlineDisk.VerifyFile(bucket, pathJoin(object, part.Name), erasure.ShardFileSize(part.Size), checksumInfo.Algorithm, checksumInfo.Hash, erasure.ShardSize())
+				checksumInfo := erasureInfo.GetChecksumInfo(part.Number)
+				partPath := pathJoin(object, fmt.Sprintf("part.%d", part.Number))
+				err = onlineDisk.VerifyFile(bucket, partPath, erasure.ShardFileSize(part.Size), checksumInfo.Algorithm, checksumInfo.Hash, erasure.ShardSize())
 				if err != nil {
 					if !IsErr(err, []error{
 						errFileNotFound,
@@ -198,7 +200,8 @@ func disksWithAllParts(ctx context.Context, onlineDisks []StorageAPI, partsMetad
 			}
 		case madmin.HealNormalScan:
 			for _, part := range partsMetadata[i].Parts {
-				_, err := onlineDisk.StatFile(bucket, pathJoin(object, part.Name))
+				partPath := pathJoin(object, fmt.Sprintf("part.%d", part.Number))
+				_, err := onlineDisk.StatFile(bucket, partPath)
 				if err != nil {
 					dataErrs[i] = err
 					break