func (er erasureObjects) newMultipartUpload(ctx context.Context, bucket string, object string, opts ObjectOptions) (*NewMultipartUploadResult, error) {
	if opts.CheckPrecondFn != nil {
		// Lock the object before reading.
		lk := er.NewNSLock(bucket, object)
		lkctx, err := lk.GetRLock(ctx, globalOperationTimeout)
		if err != nil {
			return nil, err
		}
		rctx := lkctx.Context()
		obj, err := er.getObjectInfo(rctx, bucket, object, opts)

		break
	}

	return z, nil
}

func (z *erasureServerPools) NewNSLock(bucket string, objects ...string) RWLocker {
	poolID := hashKey(z.distributionAlgo, "", len(z.serverPools), z.deploymentID)
	if len(objects) >= 1 {
		poolID = hashKey(z.distributionAlgo, objects[0], len(z.serverPools), z.deploymentID)
	}
	return z.serverPools[poolID].NewNSLock(bucket, objects...)
}

// GetDisksID will return disks by their ID.

	// some may be local and some remote.
	getEndpointStrings func() []string

	// Locker mutex map.
	nsMutex *nsLockMap
}

// NewNSLock - initialize a new namespace RWLocker instance.
func (er erasureObjects) NewNSLock(bucket string, objects ...string) RWLocker {
	return er.nsMutex.NewNSLock(er.getLockers, bucket, objects...)
}

// Shutdown function for object storage interface.

				duration = time.Second
			}
			time.Sleep(duration)
		}
	}()
}

func runCallhome(ctx context.Context, objAPI ObjectLayer) bool {
	// Make sure only 1 callhome is running on the cluster.
	locker := objAPI.NewNSLock(minioMetaBucket, "callhome/runCallhome.lock")
	lkctx, err := locker.GetLock(ctx, callhomeLeaderLockTimeout)
	if err != nil {
		// lock timedout means some other node is the leader,
		// cycle back return 'true'
		return true

	}

	logger.GetReqInfo(ctx).AppendTags("objectLocation", op)
}

// NewNSLock - initialize a new namespace RWLocker instance.
func (s *erasureSets) NewNSLock(bucket string, objects ...string) RWLocker {
	if len(objects) == 1 {
		return s.getHashedSet(objects[0]).NewNSLock(bucket, objects...)
	}
	return s.getHashedSet("").NewNSLock(bucket, objects...)
}

// SetDriveCount returns the current drives per set.

	}

	// This call shouldn't be used for anything other than metadata updates or adding self referential versions.
	if !srcInfo.metadataOnly {
		return oi, NotImplemented{}
	}

	if !dstOpts.NoLock {
		lk := er.NewNSLock(dstBucket, dstObject)
		lkctx, err := lk.GetLock(ctx, globalOperationTimeout)
		if err != nil {
			return oi, err
		}
		ctx = lkctx.Context()
		defer lk.Unlock(lkctx)
	}

			// its a new pool that can receive rebalanced data.
			z.rebalMeta.PoolStats = append(z.rebalMeta.PoolStats, &rebalanceStats{})
			ok = true
		}
	}
	if ok {
		lock := z.serverPools[0].NewNSLock(minioMetaBucket, rebalMetaName)
		lkCtx, err := lock.GetLock(ctx, globalOperationTimeout)
		if err != nil {
			rebalanceLogIf(ctx, fmt.Errorf("failed to acquire write lock on %s/%s: %w", minioMetaBucket, rebalMetaName, err))

		return errInvalidEncryptionParameters
	}
	versioned := globalBucketVersioningSys.PrefixEnabled(srcBucket, srcObject)
	versionSuspended := globalBucketVersioningSys.PrefixSuspended(srcBucket, srcObject)

	lock := api.NewNSLock(r.Bucket, objInfo.Name)
	lkctx, err := lock.GetLock(ctx, globalOperationTimeout)
	if err != nil {
		return err
	}
	ctx = lkctx.Context()
	defer lock.Unlock(lkctx)

	opts := ObjectOptions{

	o.EvalRetentionBypassFn = f
}

// ObjectLayer implements primitives for object API layer.
type ObjectLayer interface {
	// Locking operations on object.
	NewNSLock(bucket string, objects ...string) RWLocker

	// Storage operations.
	Shutdown(context.Context) error
	NSScanner(ctx context.Context, updates chan<- DataUsageInfo, wantCycle uint32, scanMode madmin.HealScanMode) error

		Type:      madmin.HealItemObject,
		Bucket:    bucket,
		Object:    object,
		VersionID: versionID,
		DiskCount: len(storageDisks),
	}

	if !opts.NoLock {
		lk := er.NewNSLock(bucket, object)
		lkctx, err := lk.GetLock(ctx, globalOperationTimeout)
		if err != nil {
			return result, err
		}
		ctx = lkctx.Context()
		defer lk.Unlock(lkctx)
	}