return ObjectNameInvalid{Bucket: bucket, Object: object}
	}
	return nil
}

// Checks for all ListObjects arguments validity.
func checkListObjsArgs(ctx context.Context, bucket, prefix, marker string) error {
	// Verify if bucket is valid.
	if !isMinioMetaBucketName(bucket) && s3utils.CheckValidBucketNameStrict(bucket) != nil {
		return BucketNameInvalid{Bucket: bucket}

// Other important fields are Limit, Marker.
// List ID always derived from the Marker.
func (z *erasureServerPools) listPath(ctx context.Context, o *listPathOptions) (entries metaCacheEntriesSorted, err error) {
	if err := checkListObjsArgs(ctx, o.Bucket, o.Prefix, o.Marker); err != nil {
		return entries, err
	}

	// Marker points to before the prefix, just ignore it.
	if o.Marker < o.Prefix {
		o.Marker = ""
	}

// then Walk() stops the walker.
func (z *erasureServerPools) Walk(ctx context.Context, bucket, prefix string, results chan<- ObjectInfo, opts WalkOptions) error {
	if err := checkListObjsArgs(ctx, bucket, prefix, ""); err != nil {
		// Upon error close the channel.
		xioutil.SafeClose(results)
		return err
	}

	vcfg, _ := globalBucketVersioningSys.Get(bucket)