# Bucket Versioning Design Guide [![Slack](https://slack.min.io/slack?type=svg)](https://slack.min.io) [![Docker Pulls](https://img.shields.io/docker/pulls/minio/minio.svg?maxAge=604800)](https://hub.docker.com/r/minio/minio/)

## Description of `xl.meta`

`xl.meta` is a new self describing backend format used by MinIO to support AWS S3 compatible versioning.
This file is the source of truth for each `version` at rest. `xl.meta` is a msgpack file serialized from a

	defer xioutil.SafeClose(resp)

	volumeDir := pathJoin(s.drivePath, req.Bucket)
	found := 0
	for _, f := range req.Files {
		if contextCanceled(ctx) {
			return ctx.Err()
		}
		r := ReadMultipleResp{
			Bucket: req.Bucket,
			Prefix: req.Prefix,
			File:   f,
		}

		var data []byte
		var mt time.Time

	if hip.bucket == "" {
		if hip.objPrefix != "" {
			// Bucket is required if object-prefix is given
			err = ErrHealMissingBucket
			return
		}
	} else if isReservedOrInvalidBucket(hip.bucket, false) {
		err = ErrInvalidBucketName
		return
	}

	// empty prefix is valid.
	if !IsValidObjectPrefix(hip.objPrefix) {
		err = ErrInvalidObjectName
		return
	}

			Optional:    true,
			Type:        "boolean",
		},
		config.HelpKV{
			Key:         apiSyncEvents,
			Description: "set to enable synchronous bucket notifications" + defaultHelpPostfix(apiSyncEvents),
			Optional:    true,
			Type:        "boolean",
		},
		config.HelpKV{
			Key:         apiObjectMaxVersions,

	setRequestLimitMiddleware,
	// Validate all the incoming requests.
	setRequestValidityMiddleware,
	// Add upload forwarding middleware for site replication
	setUploadForwardingMiddleware,
	// Add bucket forwarding middleware
	setBucketForwardingMiddleware,
	// Add new middlewares here.
}

// configureServer handler returns final handler for the http server.

	}
	return nums
}

// Reads all `xl.meta` metadata as a FileInfo slice.
// Returns error slice indicating the failed metadata reads.
func readAllFileInfo(ctx context.Context, disks []StorageAPI, origbucket string, bucket, object, versionID string, readData, healing bool) ([]FileInfo, []error) {
	metadataArray := make([]FileInfo, len(disks))

	opts := ReadOptions{
		ReadData: readData,
		Healing:  healing,
	}

            stage,
            flameGraphGenerationBuildSpec,
            description = "Flame graphs with $profiler for ${performanceScenario.scenario.scenario} | ${performanceScenario.testProject} on ${os.asName()} (bucket $bucketIndex)",
            performanceSubProject = "performance",
            bucketIndex = bucketIndex,

			timeToFirstByte = tc.ResponseRecorder.TTFB()
		}

		entry.AccessKey = reqInfo.Cred.AccessKey
		entry.ParentUser = reqInfo.Cred.ParentUser

		entry.API.Name = reqInfo.API
		entry.API.Bucket = reqInfo.BucketName
		entry.API.Object = reqInfo.ObjectName
		entry.API.Objects = make([]audit.ObjectVersion, 0, len(reqInfo.Objects))
		for _, ov := range reqInfo.Objects {

    preBuildSteps: BuildSteps.() -> Unit = {}
) : BaseGradleBuildType(
    stage = stage,
    init = {
        this.id(performanceTestBuildSpec.asConfigurationId(model, "bucket${bucketIndex + 1}"))
        this.name = "$description${if (performanceTestBuildSpec.withoutDependencies) " (without dependencies)" else ""}"
        val type = performanceTestBuildSpec.type

ret=$?
if [ $ret -ne 0 ]; then
	echo "BUG: expected no missing entries after decommission: $out"
	exit 1
fi

./s3-check-md5 -versions -access-key minioadmin -secret-key minioadmin -endpoint http://127.0.0.1:9001/ -bucket versioned