// Storage operations.

	// Returns true if disk is online and its valid i.e valid format.json.
	// This has nothing to do with if the drive is hung or not responding.
	// For that individual storage API calls will fail properly. The purpose
	// of this function is to know if the "drive" has "format.json" or not
	// if it has a "format.json" then is it correct "format.json" or not.
	IsOnline() bool

	// Returns the last time this disk (re)-connected

	}
	idx := xxhash.Sum64String(s) % uint64(len(peerClients))
	return peerClients[idx]
}

// GetPeerOnlineCount gets the count of online and offline nodes.
func (sys *NotificationSys) GetPeerOnlineCount() (nodesOnline, nodesOffline int) {
	nodesOnline = 1 // Self is always online.
	nodesOffline = 0
	nodesOnlineIndex := make([]bool, len(sys.peerClients))
	var wg sync.WaitGroup
	for idx, client := range sys.peerClients {

		for _, disk := range onlineDisks {
			if disk != nil && disk.IsOnline() {
				continue
			}
			er.addPartial(bucket, object, fi.VersionID)
			break
		}
	}

	for i := 0; i < len(onlineDisks); i++ {
		if onlineDisks[i] != nil && onlineDisks[i].IsOnline() {
			// Object info is the same in all disks, so we can pick
			// the first meta from online disk
			fi = partsMetadata[i]
			break
		}
	}

			z.Checksum, bts, err = msgp.ReadBytesBytes(bts, z.Checksum)
			if err != nil {
				err = msgp.WrapError(err, "Checksum")
				return
			}
		case "Inlined":
			z.Inlined, bts, err = msgp.ReadBoolBytes(bts)
			if err != nil {
				err = msgp.WrapError(err, "Inlined")
				return
			}
		case "DataBlocks":
			z.DataBlocks, bts, err = msgp.ReadIntBytes(bts)
			if err != nil {

		clusterDriveMetrics: newClusterStorageInfoCache(),
		nodesUpDown:         newNodesUpDownCache(),
	}
}

type nodesOnline struct {
	Online, Offline int
}

func newNodesUpDownCache() *cachevalue.Cache[nodesOnline] {
	loadNodesUpDown := func() (v nodesOnline, err error) {
		v.Online, v.Offline = globalNotificationSys.GetPeerOnlineCount()
		return
	}
	return cachevalue.NewFromFunc(1*time.Minute,

			localEndpoints = append(localEndpoints, endpoint)
		}
	}

	return getStorageInfo(localDisks, localEndpoints, metrics)
}

// getOnlineDisksWithHealingAndInfo - returns online disks and overall healing status.
// Disks are ordered in the following groups:
// - Non-scanning disks
// - Non-healing disks
// - Healing disks (if inclHealing is true)

		kmsCtx, err := kmsContext.MarshalText()
		if err != nil {
			results = append(results, VerifyResult{Status: "offline", Endpoint: endpoint})
			continue
		}
		result := VerifyResult{Status: "online", Endpoint: endpoint, Version: state.Version}
		key, err := client.GenerateKey(ctx, env.Get(EnvKESKeyName, ""), kmsCtx)
		if err != nil {
			result.Encrypt = fmt.Sprintf("Encryption failed: %v", err)
		} else {

		restoreObjStatus string
		expireRestored   bool
		expectedDataDir  string
	}{
		{ // object versions with inlined data don't count towards shared data directory
			versionID: mustGetUUID(),
			dataDir:   d0,
			data:      data,
			shares:    0,
		},
		{ // object versions with inlined data don't count towards shared data directory
			versionID: mustGetUUID(),
			dataDir:   d1,
			data:      data2,

	case len(w.buffer) > 0:
		err = errors.New("some file segments were not flushed from the queue")
		_ = w.w.CloseWithError(err)
	case w.err != nil:
		// No need to close here since both pipes were
		// closing inside TransferError()
		err = w.err
	default:
		err = w.w.Close()
	}
	for i := range w.buffer {
		delete(w.buffer, i)
	}
	w.wg.Wait()
	return err
}

type writerAt struct {

)

//go:generate msgp -file $GOFILE

// WalkDirOptions provides options for WalkDir operations.
type WalkDirOptions struct {
	// Bucket to scanner
	Bucket string

	// Directory inside the bucket.
	BaseDir string

	// Do a full recursive scan.
	Recursive bool

	// ReportNotFound will return errFileNotFound if all disks reports the BaseDir cannot be found.
	ReportNotFound bool