ceiling := ceilFrac(testCase.numerator, testCase.denominator)
		if ceiling != testCase.ceiling {
			t.Errorf("Case %d: Unexpected result: %d", i, ceiling)
		}
	}
}

// Test if isErrIgnored works correctly.
func TestIsErrIgnored(t *testing.T) {
	errIgnored := fmt.Errorf("ignored error")
	testCases := []struct {
		err     error
		ignored bool
	}{
		{
			err:     nil,
			ignored: false,

		writers:     writers,
		writeQuorum: quorum,
		errs:        make([]error, len(writers)),
	}

	for {
		var blocks [][]byte
		n, err := io.ReadFull(src, buf)
		if err != nil {
			if !IsErrIgnored(err, []error{
				io.EOF,
				io.ErrUnexpectedEOF,
			}...) {
				return 0, err
			}
		}

		eof := err == io.EOF || err == io.ErrUnexpectedEOF
		if n == 0 && total != 0 {

// maximal values would occur quorum or more number of times.
func reduceErrs(errs []error, ignoredErrs []error) (maxCount int, maxErr error) {
	errorCounts := make(map[error]int)
	for _, err := range errs {
		if IsErrIgnored(err, ignoredErrs...) {
			continue
		}
		// Errors due to context cancellation may be wrapped - group them by context.Canceled.
		if errors.Is(err, context.Canceled) {
			errorCounts[context.Canceled]++

func autoGenerateRootCredentials() auth.Credentials {
	if GlobalKMS == nil {
		return globalActiveCred
	}

	aKey, err := GlobalKMS.MAC(GlobalContext, &kms.MACRequest{Message: []byte("root access key")})
	if IsErrIgnored(err, kes.ErrNotAllowed, kms.ErrNotSupported, errors.ErrUnsupported, kms.ErrPermission) {
		// If we don't have permission to compute the HMAC, don't change the cred.
		return globalActiveCred
	}
	if err != nil {

	var err error
	var buckets []BucketInfo
	if globalDNSConfig != nil && globalBucketFederation {
		dnsBuckets, err := globalDNSConfig.List()
		if err != nil && !IsErrIgnored(err,
			dns.ErrNoEntriesFound,
			dns.ErrDomainMissing) {
			writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
			return
		}
		for _, dnsRecords := range dnsBuckets {