return
				}
				z.ErasureAlgorithm = ErasureAlgo(zb0002)
			}
		case "EcM":
			z.ErasureM, err = dc.ReadInt()
			if err != nil {
				err = msgp.WrapError(err, "ErasureM")
				return
			}
		case "EcN":
			z.ErasureN, err = dc.ReadInt()
			if err != nil {
				err = msgp.WrapError(err, "ErasureN")
				return
			}
		case "EcBSize":
			z.ErasureBlockSize, err = dc.ReadInt64()

	}
	fi.Erasure.Algorithm = j.ErasureAlgorithm.String()
	fi.Erasure.Index = j.ErasureIndex
	fi.Erasure.BlockSize = j.ErasureBlockSize
	fi.Erasure.DataBlocks = j.ErasureM
	fi.Erasure.ParityBlocks = j.ErasureN
	fi.Erasure.Distribution = make([]int, len(j.ErasureDist))
	for i := range j.ErasureDist {
		fi.Erasure.Distribution[i] = int(j.ErasureDist[i])
	}

	"github.com/minio/minio/internal/logger"
)

// Erasure - erasure encoding details.
type Erasure struct {
	encoder                  func() reedsolomon.Encoder
	dataBlocks, parityBlocks int
	blockSize                int64
}

// NewErasure creates a new ErasureStorage.
func NewErasure(ctx context.Context, dataBlocks, parityBlocks int, blockSize int64) (e Erasure, err error) {
	// Check the parameters for sanity now.

	// Shuffle buckets to ensure total randomness of buckets, being scanned.
	// Otherwise same set of buckets get scanned across erasure sets always.
	// at any given point in time. This allows different buckets to be scanned
	// in different order per erasure set, this wider spread is needed when
	// there are lots of buckets with different order of objects in them.
	r := rand.New(rand.NewSource(time.Now().UnixNano()))

	formatV2.Format = formatBackendErasure
	formatV2.Erasure.Version = formatErasureVersionV2
	formatV2.Erasure.DistributionAlgo = formatErasureVersionV2DistributionAlgoV1
	formatV2.Erasure.This = formatV1.Erasure.Disk
	formatV2.Erasure.Sets = make([][]string, 1)
	formatV2.Erasure.Sets[0] = make([]string, len(formatV1.Erasure.JBOD))
	copy(formatV2.Erasure.Sets[0], formatV1.Erasure.JBOD)

	return json.Marshal(formatV2)
}

// ShardSize - returns actual shared size from erasure blockSize.
func (e ErasureInfo) ShardSize() int64 {
	return ceilFrac(e.BlockSize, int64(e.DataBlocks))
}

// IsValid - tells if erasure info fields are valid.
func (fi FileInfo) IsValid() bool {
	if fi.Deleted {
		// Delete marker has no data, no need to check
		// for erasure coding information
		return true
	}
	dataBlocks := fi.Erasure.DataBlocks

		errs, latestMeta, bucket, object, scanMode)

	var erasure Erasure
	if !latestMeta.Deleted && !latestMeta.IsRemote() {
		// Initialize erasure coding
		erasure, err = NewErasure(ctx, latestMeta.Erasure.DataBlocks,
			latestMeta.Erasure.ParityBlocks, latestMeta.Erasure.BlockSize)
		if err != nil {
			return result, err
		}
	}

erasure-code.png...

			writers[i] = newBitrotWriter(disk, "", "testbucket", "object", erasure.ShardFileSize(test.data), writeAlgorithm, erasure.ShardSize())
		}
		n, err := erasure.Encode(context.Background(), bytes.NewReader(data), writers, buffer, erasure.dataBlocks+1)
		closeBitrotWriters(writers)
		if err != nil {
			t.Fatalf("Test %d: failed to create erasure test file: %v", i, err)
		}
		if n != test.data {

erasure-code.jpg...