MaxSize      int64    `msg:"ms"`           // Return error if size is exceed.
	MetadataOnly bool     `msg:"mo"`           // Read as XL meta and truncate data.
	AbortOn404   bool     `msg:"ab"`           // Stop reading after first file not found.
	MaxResults   int      `msg:"mr"`           // Stop after this many successful results. <= 0 means all.
}