}

// ShardSize - returns actual shared size from erasure blockSize.
func (e ErasureInfo) ShardSize() int64 {
	return ceilFrac(e.BlockSize, int64(e.DataBlocks))
}

// IsValid - tells if erasure info fields are valid.
func (fi FileInfo) IsValid() bool {
	if fi.Deleted {
		// Delete marker has no data, no need to check
		// for erasure coding information
		return true
	}
	dataBlocks := fi.Erasure.DataBlocks

	if err := storageServerRequestValidate(r); err != nil {
		s.writeErrorResponse(w, err)
		return false
	}

	return true
}

// IsValid - To authenticate and check if the disk-id in the request corresponds to the underlying disk.
func (s *storageRESTServer) IsValid(w http.ResponseWriter, r *http.Request) bool {
	if !s.IsAuthValid(w, r) {
		return false
	}

	if err := r.ParseForm(); err != nil {

}

// SetTarget - sets a new minio-go client target for this bucket.
func (sys *BucketTargetSys) SetTarget(ctx context.Context, bucket string, tgt *madmin.BucketTarget, update bool) error {
	if !tgt.Type.IsValid() && !update {
		return BucketRemoteArnTypeInvalid{Bucket: bucket}
	}
	clnt, err := sys.getRemoteTargetClient(tgt)
	if err != nil {
		return BucketRemoteTargetNotFound{Bucket: tgt.TargetBucket, Err: err}
	}

	type Alias Config
	aux := &struct {
		*Alias
	}{
		Alias: (*Alias)(sCfg),
	}
	return json.Unmarshal(data, &aux)
}

// IsValid - returns true if input string is a valid
// storage class kind supported.
func IsValid(sc string) bool {
	return sc == RRS || sc == STANDARD
}

// UnmarshalText unmarshals storage class from its textual form into
// storageClass structure.

	}

	// Iterate through all the modTimes and count the FileInfo(s) with latest time.
	for index, t := range modTimes {
		if partsMetadata[index].IsValid() && t.Equal(modTime) {
			latestFileInfo = partsMetadata[index]
			count++
		}
	}

	if !latestFileInfo.IsValid() {
		return FileInfo{}, errErasureReadQuorum
	}

	if count < latestFileInfo.Erasure.DataBlocks {
		return FileInfo{}, errErasureReadQuorum
	}

	sseConfig.Apply(r.Header, sse.ApplyOptions{
		AutoEncrypt: globalAutoEncryption,
	})

	// Validate storage class metadata if present
	if sc := r.Header.Get(xhttp.AmzStorageClass); sc != "" {
		if !storageclass.IsValid(sc) {
			writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidStorageClass), r.URL)
			return
		}
	}

	encMetadata := map[string]string{}

	if crypto.Requested(r.Header) {

			for index, e := range etags {
				if partsMetadata[index].IsValid() && e == etag {
					onlineDisks[index] = disks[index]
				} else {
					onlineDisks[index] = nil
				}
			}
			return onlineDisks, modTime, etag
		}
	}

	// Create a new online disks slice, which have common uuid.
	for index, t := range modTimes {
		if partsMetadata[index].IsValid() && t.Equal(modTime) {
			onlineDisks[index] = disks[index]

func (cred Credentials) IsImpliedPolicy() bool {
	if cred.IsServiceAccount() {
		return cred.Claims[iamPolicyClaimNameSA] == "inherited-policy"
	}
	return false
}

// IsValid - returns whether credential is valid or not.
func (cred Credentials) IsValid() bool {
	// Verify credentials if its enabled or not set.
	if cred.Status == AccountOff {
		return false
	}

		if disks[i] == nil {
			// Assuming offline drives as inconsistent,
			// to be safe and fallback to original
			// distribution order.
			inconsistent++
			continue
		}
		if !meta.IsValid() {
			inconsistent++
			continue
		}
		if meta.XLV1 != fi.XLV1 {
			inconsistent++
			continue
		}
		// check if erasure distribution order matches the index

	notFoundMetaErrs, nonActionableMetaErrs := danglingErrsCount(errs)
	notFoundPartsErrs, nonActionablePartsErrs := danglingErrsCount(dataErrs)

	for _, m := range metaArr {
		if m.IsValid() {
			validMeta = m
			break
		}
	}

	if !validMeta.IsValid() {
		// validMeta is invalid because all xl.meta is missing apparently
		// we should figure out if dataDirs are also missing > dataBlocks.
		dataBlocks := (len(dataErrs) + 1) / 2