Simplify erasure code by separating bitrot from erasure code (#5959)

cmd/xl-v1-common.go

@@ -103,16 +103,3 @@ func (xl xlObjects) isObjectDir(bucket, prefix string) (ok bool) {
 	} // Exhausted all disks - return false.
 	return false
 }
-
-// Calculate the space occupied by an object in a single disk
-func (xl xlObjects) sizeOnDisk(fileSize int64, blockSize int64, dataBlocks int) int64 {
-	numBlocks := fileSize / blockSize
-	chunkSize := ceilFrac(blockSize, int64(dataBlocks))
-	sizeInDisk := numBlocks * chunkSize
-	remaining := fileSize % blockSize
-	if remaining > 0 {
-		sizeInDisk += ceilFrac(remaining, int64(dataBlocks))
-	}
-
-	return sizeInDisk
-}