var (

	// systemTargets is the set of enabled loggers.
	// Must be immutable at all times.
	// Can be swapped to another while holding swapMu
	systemTargets  = []Target{}
	swapSystemMuRW sync.RWMutex

	// auditTargets is the list of enabled audit loggers
	// Must be immutable at all times.
	// Can be swapped to another while holding swapMu
	auditTargets  = []Target{}
	swapAuditMuRW sync.RWMutex

		return false
	}

	switch c {
	case '-', '_', '.', '/', '*':
		return false
	}
	return true
}

// s3URLEncode is based on Golang's url.QueryEscape() code,
// while considering some S3 exceptions:
//   - Avoid encoding '/' and '*'
//   - Force encoding of '~'
func s3URLEncode(s string) string {
	spaceCount, hexCount := 0, 0
	for i := 0; i < len(s); i++ {
		c := s[i]

			Optional:    true,
			Type:        "csv",
		},
		config.HelpKV{
			Key:         apiRemoteTransportDeadline,
			Description: `set the deadline for API requests on remote transports while proxying between federated instances e.g. "2h"` + defaultHelpPostfix(apiRemoteTransportDeadline),
			Optional:    true,
			Type:        "duration",
		},
		config.HelpKV{
			Key:         apiListQuorum,

	stats, err := readStat(statsFile)
	if err != nil {
		return IOStats{}, err
	}
	if len(stats) < 11 {
		return IOStats{}, fmt.Errorf("found invalid format while reading %v", statsFile)
	}
	// refer https://www.kernel.org/doc/Documentation/block/stat.txt
	iostats = IOStats{
		ReadIOs:      stats[0],
		ReadMerges:   stats[1],
		ReadSectors:  stats[2],

		Code:           "XMinioSiteReplicationBucketConfigError",
		Description:    "Error while configuring replication on a bucket",
		HTTPStatusCode: http.StatusServiceUnavailable,
	},
	ErrSiteReplicationBucketMetaError: {
		Code:           "XMinioSiteReplicationBucketMetaError",
		Description:    "Error while replicating bucket metadata",
		HTTPStatusCode: http.StatusServiceUnavailable,
	},

		// coming up and trying to read format.json or create format.json
		return nil
	}
	storedDiskID, err := p.storage.GetDiskID()
	if err != nil {
		// return any error generated while reading `format.json`
		return err
	}
	if err == nil && *p.diskID.Load() == storedDiskID {
		return nil
	}
	// not the same disk we remember, take it offline.
	return errDiskNotFound
}

	c.Assert(putMD5, getMD5)
}

// TestGetPartialObjectMisAligned - tests get object partially miss-aligned.
// create a large buffer of miss-aligned data and upload it.
// then make partial range requests to while fetching it back and assert the response content.
func (s *TestSuiteCommon) TestGetPartialObjectMisAligned(c *check) {
	// generate a random bucket name.
	bucketName := getRandomBucketName()

			// Expire all versions expiration must still verify the state() on disk
			// via a getObjectInfo() call as follows, any read quorum issues we
			// must not proceed further for safety reasons. attempt a MRF heal
			// while we see such quorum errors.
			goi, _, gerr := er.getObjectInfoAndQuorum(ctx, bucket, object, opts)
			if gerr != nil && goi.Name == "" {
				if _, ok := gerr.(InsufficientReadQuorum); ok {

	return MetricDescription{
		Namespace: bucketMetricNamespace,
		Subsystem: requestsSubsystem,
		Name:      canceledTotal,
		Help:      "Total number of S3 requests that were canceled from the client while processing on a bucket",
		Type:      counterMetric,
	}
}

func getILMNodeMetrics() *MetricsGroupV2 {
	mg := &MetricsGroupV2{
		cacheInterval: 10 * time.Second,
	}

		return err == toObjectErr(errVolumeNotFound, bucket)
	}
	return false
}

// CopyObjectHandler - Copy Object
// ----------
// This implementation of the PUT operation adds an object to a bucket
// while reading the object from another source.
// Notice: The S3 client can send secret keys in headers for encryption related jobs,
// the handler should ensure to remove these keys before sending them to the object layer.