// NewMultipartUpload metadata shuffling.
func shuffleDisksAndPartsMetadataByIndex(disks []StorageAPI, metaArr []FileInfo, fi FileInfo) (shuffledDisks []StorageAPI, shuffledPartsMetadata []FileInfo) {
	shuffledDisks = make([]StorageAPI, len(disks))
	shuffledPartsMetadata = make([]FileInfo, len(disks))
	distribution := fi.Erasure.Distribution

	var inconsistent int

// are set to nil.
// - latest (in time) of the maximally occurring modTime(s), which has at least quorum occurrences.
func listOnlineDisks(disks []StorageAPI, partsMetadata []FileInfo, errs []error, quorum int) (onlineDisks []StorageAPI, modTime time.Time, etag string) {
	onlineDisks = make([]StorageAPI, len(disks))

	// List all the file commit ids from parts metadata.
	modTimes := listObjectModtimes(partsMetadata, errs)

// OfflineDisk represents an unavailable disk.
var OfflineDisk StorageAPI // zero value is nil

// erasureObjects - Implements ER object layer.
type erasureObjects struct {
	setDriveCount      int
	defaultParityCount int

	setIndex  int
	poolIndex int

	// getDisks returns list of storageAPIs.
	getDisks func() []StorageAPI

	// getLockers returns list of remote and local lockers.

)

// Storage REST server, storageRESTReceiver and StorageRESTClient are
// inter-dependent, below test functions are sufficient to test all of them.
func testStorageAPIDiskInfo(t *testing.T, storage StorageAPI) {
	testCases := []struct {
		expectErr bool
	}{
		{true},
	}

	for i, testCase := range testCases {
		_, err := storage.DiskInfo(context.Background(), DiskInfoOptions{Metrics: true})

			t.Fatalf("Test %d: Failed to upload a random object: %v", i+1, err)
		}

		// Step 3: Upload the object with some disks offline
		sets.erasureDisksMu.Lock()
		xl.getDisks = func() []StorageAPI {
			disks := make([]StorageAPI, len(origErasureDisks))
			copy(disks, origErasureDisks)
			disks[0] = nil
			disks[1] = nil
			return disks
		}
		sets.erasureDisksMu.Unlock()

}

// relinquishes the underlying connection for all storage disks.
func closeStorageDisks(storageDisks ...StorageAPI) {
	var wg sync.WaitGroup
	for _, disk := range storageDisks {
		if disk == nil {
			continue
		}
		wg.Add(1)
		go func(disk StorageAPI) {
			defer wg.Done()
			disk.Close()
		}(disk)
	}
	wg.Wait()
}

// Initialize storage disks for each endpoint.

				continue
			}
			diskMap[disk.Endpoint()] = disk
		}
	}
	return diskMap
}

// Initializes a new StorageAPI from the endpoint argument, returns
// StorageAPI and also `format` which exists on the disk.
func connectEndpoint(endpoint Endpoint) (StorageAPI, *formatErasureV3, error) {
	disk, err := newStorageAPI(endpoint, storageOpts{
		cleanUp:     false,
		healthCheck: false,
	})

				commonCount = ops
			}
		}
		if max < readQuorum {
			return 0
		}
		return commonCount
	}

	return filter()
}

func getQuorumDiskInfos(disks []StorageAPI, infos []DiskInfo, readQuorum int) (newDisks []StorageAPI, newInfos []DiskInfo) {
	commonMutations := calcCommonCounter(infos, readQuorum)
	for i, info := range infos {
		mutations := info.Metrics.TotalDeletes + info.Metrics.TotalWrites

	}

	return nil
}

// listAllBuckets lists all buckets from all disks. It also
// returns the occurrence of each buckets in all disks
func listAllBuckets(ctx context.Context, storageDisks []StorageAPI, healBuckets map[string]VolInfo, readQuorum int) error {
	g := errgroup.WithNErrs(len(storageDisks))
	var mu sync.Mutex
	for index := range storageDisks {
		index := index
		g.Go(func() error {

			continue
		}
		wg.Add(1)
		go func(disk StorageAPI) {
			defer wg.Done()
			disk.Delete(ctx, bucket, prefix, DeleteOptions{
				Recursive: true,
				Immediate: false,
			})
		}(disk)
	}
	wg.Wait()
}

// Remove the old multipart uploads on the given disk.
func (er erasureObjects) cleanupStaleUploadsOnDisk(ctx context.Context, disk StorageAPI, expiry time.Duration) {
	drivePath := disk.Endpoint().Path