}

	user, _, s3Err := getReqAccessKeyV4(r, globalSite.Region, serviceSTS)
	if s3Err != ErrNone {
		return auth.Credentials{}, s3Err
	}

	// Temporary credentials or Service accounts cannot generate further temporary credentials.
	if user.IsTemp() || user.IsServiceAccount() {
		return auth.Credentials{}, ErrAccessDenied
	}

	// Session tokens are not allowed in STS AssumeRole requests.
	if getSessionToken(r) != "" {

	failOnErr(xl2.Load(trimmed))
	if len(xl2.data) != 0 {
		t.Fatal("data, was not trimmed, bytes left:", len(xl2.data))
	}
	// Corrupt metadata, last 5 bytes is the checksum, so go a bit further back.
	trimmed[len(trimmed)-10] += 10
	if err := xl2.Load(trimmed); err == nil {
		t.Fatal("metadata corruption not detected")
	}
}

// TestUsesDataDir tests xlMetaV2.UsesDataDir

	// utilization to be optimal, instead of blindly throttling the way we are
	// doing below. However the changes that are needed here are a bit involved,
	// further discussion advised. Remove this comment and remove the worker model
	// for this function in future.
	maxWorkers := runtime.GOMAXPROCS(0) / 2
	if maxWorkers > len(sys.peerClients) {
		maxWorkers = len(sys.peerClients)
	}

		// Format is corrupted and unrecognized by the running instance.
		healingLogIf(ctx, fmt.Errorf("Unable to heal the newly replaced drives due to format.json inconsistencies, please engage MinIO support for further assistance: %w",
			errCorruptedFormat))
		return res, errCorruptedFormat
	}

	formatOpID := mustGetUUID()

	// Initialize a new set of set formats which will be written to disk.

		},
	}

	// Create all files needed during testing.
	appendFiles := testCases[:4]
	v := NewBitrotVerifier(SHA256, getSHA256Sum([]byte("hello, world")))
	// Create test files for further reading.
	for i, appendFile := range appendFiles {
		err = xlStorage.AppendFile(context.Background(), volume, appendFile.fileName, []byte("hello, world"))
		if err != appendFile.expectedErr {

		}
		// Unread one byte if there is one.
		if n > 0 {
			if err := r.UnreadByte(); err != nil {
				t.Errorf("n = %d: unexpected error on UnreadByte: %v", n, err)
			}
		}
		// Test that we cannot unread any further.
		if err := r.UnreadByte(); err == nil {
			t.Errorf("n = %d: expected error on UnreadByte", n)
		}
	}
}

func TestUnreadByteOthers(t *testing.T) {

// and must not be a DeleteMarker or legacy object, if no
// versionID is specified 'null' versionID is updated instead.
//
// It is callers responsibility to set correct versionID, this
// function shouldn't be further extended to update immutable
// values such as ErasureInfo, ChecksumInfo.
//
// Metadata is only updated to new values, existing values
// stay as is, if you wish to update all values you should