X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/5b349796c7ddf23188c92dbe98e4ce75a2ac6ee6..3a3d67ccee068a85aa3b79c5abd40170223071e3:/services/keepstore/volume_unix_test.go

diff --git a/services/keepstore/volume_unix_test.go b/services/keepstore/volume_unix_test.go
index 6bafa7c1ca..05c7a93ae4 100644
--- a/services/keepstore/volume_unix_test.go
+++ b/services/keepstore/volume_unix_test.go
@@ -1,348 +1,445 @@
+// Copyright (C) The Arvados Authors. All rights reserved.
+//
+// SPDX-License-Identifier: AGPL-3.0
+
 package main
 
 import (
 	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
+	"strings"
+	"sync"
 	"syscall"
 	"testing"
 	"time"
+
+	"github.com/ghodss/yaml"
+	"github.com/prometheus/client_golang/prometheus"
+	check "gopkg.in/check.v1"
 )
 
-func TempUnixVolume(t *testing.T, serialize bool, readonly bool) *UnixVolume {
+type TestableUnixVolume struct {
+	UnixVolume
+	t TB
+}
+
+func NewTestableUnixVolume(t TB, serialize bool, readonly bool) *TestableUnixVolume {
 	d, err := ioutil.TempDir("", "volume_test")
 	if err != nil {
 		t.Fatal(err)
 	}
-	return &UnixVolume{
-		root:      d,
-		serialize: serialize,
-		readonly:  readonly,
+	var locker sync.Locker
+	if serialize {
+		locker = &sync.Mutex{}
+	}
+	return &TestableUnixVolume{
+		UnixVolume: UnixVolume{
+			Root:     d,
+			ReadOnly: readonly,
+			locker:   locker,
+		},
+		t: t,
 	}
 }
 
-func _teardown(v *UnixVolume) {
-	os.RemoveAll(v.root)
+// PutRaw writes a Keep block directly into a UnixVolume, even if
+// the volume is readonly.
+func (v *TestableUnixVolume) PutRaw(locator string, data []byte) {
+	defer func(orig bool) {
+		v.ReadOnly = orig
+	}(v.ReadOnly)
+	v.ReadOnly = false
+	err := v.Put(context.Background(), locator, data)
+	if err != nil {
+		v.t.Fatal(err)
+	}
 }
 
-// _store writes a Keep block directly into a UnixVolume, bypassing
-// the overhead and safeguards of Put(). Useful for storing bogus data
-// and isolating unit tests from Put() behavior.
-func _store(t *testing.T, vol *UnixVolume, filename string, block []byte) {
-	blockdir := fmt.Sprintf("%s/%s", vol.root, filename[:3])
-	if err := os.MkdirAll(blockdir, 0755); err != nil {
-		t.Fatal(err)
+func (v *TestableUnixVolume) TouchWithDate(locator string, lastPut time.Time) {
+	err := syscall.Utime(v.blockPath(locator), &syscall.Utimbuf{lastPut.Unix(), lastPut.Unix()})
+	if err != nil {
+		v.t.Fatal(err)
 	}
+}
 
-	blockpath := fmt.Sprintf("%s/%s", blockdir, filename)
-	if f, err := os.Create(blockpath); err == nil {
-		f.Write(block)
-		f.Close()
-	} else {
-		t.Fatal(err)
+func (v *TestableUnixVolume) Teardown() {
+	if err := os.RemoveAll(v.Root); err != nil {
+		v.t.Fatal(err)
 	}
 }
 
-func TestGet(t *testing.T) {
-	v := TempUnixVolume(t, false, false)
-	defer _teardown(v)
-	_store(t, v, TEST_HASH, TEST_BLOCK)
+// serialize = false; readonly = false
+func TestUnixVolumeWithGenericTests(t *testing.T) {
+	DoGenericVolumeTests(t, func(t TB) TestableVolume {
+		return NewTestableUnixVolume(t, false, false)
+	})
+}
 
-	buf, err := v.Get(TEST_HASH)
-	if err != nil {
+// serialize = false; readonly = true
+func TestUnixVolumeWithGenericTestsReadOnly(t *testing.T) {
+	DoGenericVolumeTests(t, func(t TB) TestableVolume {
+		return NewTestableUnixVolume(t, false, true)
+	})
+}
+
+// serialize = true; readonly = false
+func TestUnixVolumeWithGenericTestsSerialized(t *testing.T) {
+	DoGenericVolumeTests(t, func(t TB) TestableVolume {
+		return NewTestableUnixVolume(t, true, false)
+	})
+}
+
+// serialize = false; readonly = false
+func TestUnixVolumeHandlersWithGenericVolumeTests(t *testing.T) {
+	DoHandlersWithGenericVolumeTests(t, func(t TB) (*RRVolumeManager, []TestableVolume) {
+		vols := make([]Volume, 2)
+		testableUnixVols := make([]TestableVolume, 2)
+
+		for i := range vols {
+			v := NewTestableUnixVolume(t, false, false)
+			vols[i] = v
+			testableUnixVols[i] = v
+		}
+
+		return MakeRRVolumeManager(vols), testableUnixVols
+	})
+}
+
+func TestReplicationDefault1(t *testing.T) {
+	v := &UnixVolume{
+		Root:     "/",
+		ReadOnly: true,
+	}
+	metrics := newVolumeMetricsVecs(prometheus.NewRegistry()).curryWith(
+		v.String(), v.Status().MountPoint, fmt.Sprintf("%d", v.Status().DeviceNum))
+	if err := v.Start(metrics); err != nil {
 		t.Error(err)
 	}
-	if bytes.Compare(buf, TEST_BLOCK) != 0 {
-		t.Errorf("expected %s, got %s", string(TEST_BLOCK), string(buf))
+	if got := v.Replication(); got != 1 {
+		t.Errorf("Replication() returned %d, expected 1 if no config given", got)
 	}
 }
 
 func TestGetNotFound(t *testing.T) {
-	v := TempUnixVolume(t, false, false)
-	defer _teardown(v)
-	_store(t, v, TEST_HASH, TEST_BLOCK)
+	v := NewTestableUnixVolume(t, false, false)
+	defer v.Teardown()
+	v.Put(context.Background(), TestHash, TestBlock)
 
-	buf, err := v.Get(TEST_HASH_2)
+	buf := make([]byte, BlockSize)
+	n, err := v.Get(context.Background(), TestHash2, buf)
 	switch {
 	case os.IsNotExist(err):
 		break
 	case err == nil:
-		t.Errorf("Read should have failed, returned %s", string(buf))
+		t.Errorf("Read should have failed, returned %+q", buf[:n])
 	default:
 		t.Errorf("Read expected ErrNotExist, got: %s", err)
 	}
 }
 
 func TestPut(t *testing.T) {
-	v := TempUnixVolume(t, false, false)
-	defer _teardown(v)
+	v := NewTestableUnixVolume(t, false, false)
+	defer v.Teardown()
 
-	err := v.Put(TEST_HASH, TEST_BLOCK)
+	err := v.Put(context.Background(), TestHash, TestBlock)
 	if err != nil {
 		t.Error(err)
 	}
-	p := fmt.Sprintf("%s/%s/%s", v.root, TEST_HASH[:3], TEST_HASH)
+	p := fmt.Sprintf("%s/%s/%s", v.Root, TestHash[:3], TestHash)
 	if buf, err := ioutil.ReadFile(p); err != nil {
 		t.Error(err)
-	} else if bytes.Compare(buf, TEST_BLOCK) != 0 {
+	} else if bytes.Compare(buf, TestBlock) != 0 {
 		t.Errorf("Write should have stored %s, did store %s",
-			string(TEST_BLOCK), string(buf))
+			string(TestBlock), string(buf))
 	}
 }
 
 func TestPutBadVolume(t *testing.T) {
-	v := TempUnixVolume(t, false, false)
-	defer _teardown(v)
+	v := NewTestableUnixVolume(t, false, false)
+	defer v.Teardown()
 
-	os.Chmod(v.root, 000)
-	err := v.Put(TEST_HASH, TEST_BLOCK)
+	os.Chmod(v.Root, 000)
+	err := v.Put(context.Background(), TestHash, TestBlock)
 	if err == nil {
 		t.Error("Write should have failed")
 	}
 }
 
 func TestUnixVolumeReadonly(t *testing.T) {
-	v := TempUnixVolume(t, false, false)
-	defer _teardown(v)
-
-	// First write something before marking readonly
-	err := v.Put(TEST_HASH, TEST_BLOCK)
-	if err != nil {
-		t.Error("got err %v, expected nil", err)
-	}
+	v := NewTestableUnixVolume(t, false, true)
+	defer v.Teardown()
 
-	v.readonly = true
+	v.PutRaw(TestHash, TestBlock)
 
-	_, err = v.Get(TEST_HASH)
+	buf := make([]byte, BlockSize)
+	_, err := v.Get(context.Background(), TestHash, buf)
 	if err != nil {
-		t.Error("got err %v, expected nil", err)
+		t.Errorf("got err %v, expected nil", err)
 	}
 
-	err = v.Put(TEST_HASH, TEST_BLOCK)
+	err = v.Put(context.Background(), TestHash, TestBlock)
 	if err != MethodDisabledError {
-		t.Error("got err %v, expected MethodDisabledError", err)
+		t.Errorf("got err %v, expected MethodDisabledError", err)
 	}
 
-	err = v.Touch(TEST_HASH)
+	err = v.Touch(TestHash)
 	if err != MethodDisabledError {
-		t.Error("got err %v, expected MethodDisabledError", err)
+		t.Errorf("got err %v, expected MethodDisabledError", err)
 	}
 
-	err = v.Delete(TEST_HASH)
+	err = v.Trash(TestHash)
 	if err != MethodDisabledError {
-		t.Error("got err %v, expected MethodDisabledError", err)
+		t.Errorf("got err %v, expected MethodDisabledError", err)
 	}
 }
 
-// TestPutTouch
-//     Test that when applying PUT to a block that already exists,
-//     the block's modification time is updated.
-func TestPutTouch(t *testing.T) {
-	v := TempUnixVolume(t, false, false)
-	defer _teardown(v)
+func TestIsFull(t *testing.T) {
+	v := NewTestableUnixVolume(t, false, false)
+	defer v.Teardown()
 
-	if err := v.Put(TEST_HASH, TEST_BLOCK); err != nil {
-		t.Error(err)
+	fullPath := v.Root + "/full"
+	now := fmt.Sprintf("%d", time.Now().Unix())
+	os.Symlink(now, fullPath)
+	if !v.IsFull() {
+		t.Errorf("%s: claims not to be full", v)
 	}
+	os.Remove(fullPath)
 
-	// We'll verify { t0 < threshold < t1 }, where t0 is the
-	// existing block's timestamp on disk before Put() and t1 is
-	// its timestamp after Put().
-	threshold := time.Now().Add(-time.Second)
+	// Test with an expired /full link.
+	expired := fmt.Sprintf("%d", time.Now().Unix()-3605)
+	os.Symlink(expired, fullPath)
+	if v.IsFull() {
+		t.Errorf("%s: should no longer be full", v)
+	}
+}
 
-	// Set the stored block's mtime far enough in the past that we
-	// can see the difference between "timestamp didn't change"
-	// and "timestamp granularity is too low".
-	{
-		oldtime := time.Now().Add(-20 * time.Second).Unix()
-		if err := syscall.Utime(v.blockPath(TEST_HASH),
-			&syscall.Utimbuf{oldtime, oldtime}); err != nil {
-			t.Error(err)
-		}
+func TestNodeStatus(t *testing.T) {
+	v := NewTestableUnixVolume(t, false, false)
+	defer v.Teardown()
 
-		// Make sure v.Mtime() agrees the above Utime really worked.
-		if t0, err := v.Mtime(TEST_HASH); err != nil || t0.IsZero() || !t0.Before(threshold) {
-			t.Errorf("Setting mtime failed: %v, %v", t0, err)
-		}
+	// Get node status and make a basic sanity check.
+	volinfo := v.Status()
+	if volinfo.MountPoint != v.Root {
+		t.Errorf("GetNodeStatus mount_point %s, expected %s", volinfo.MountPoint, v.Root)
 	}
-
-	// Write the same block again.
-	if err := v.Put(TEST_HASH, TEST_BLOCK); err != nil {
-		t.Error(err)
+	if volinfo.DeviceNum == 0 {
+		t.Errorf("uninitialized device_num in %v", volinfo)
 	}
-
-	// Verify threshold < t1
-	t1, err := v.Mtime(TEST_HASH)
-	if err != nil {
-		t.Error(err)
+	if volinfo.BytesFree == 0 {
+		t.Errorf("uninitialized bytes_free in %v", volinfo)
 	}
-	if t1.Before(threshold) {
-		t.Errorf("t1 %v must be >= threshold %v after v.Put ",
-			t1, threshold)
+	if volinfo.BytesUsed == 0 {
+		t.Errorf("uninitialized bytes_used in %v", volinfo)
 	}
 }
 
-// Serialization tests: launch a bunch of concurrent
-//
-// TODO(twp): show that the underlying Read/Write operations executed
-// serially and not concurrently. The easiest way to do this is
-// probably to activate verbose or debug logging, capture log output
-// and examine it to confirm that Reads and Writes did not overlap.
-//
-// TODO(twp): a proper test of I/O serialization requires that a
-// second request start while the first one is still underway.
-// Guaranteeing that the test behaves this way requires some tricky
-// synchronization and mocking.  For now we'll just launch a bunch of
-// requests simultaenously in goroutines and demonstrate that they
-// return accurate results.
-//
-func TestGetSerialized(t *testing.T) {
-	// Create a volume with I/O serialization enabled.
-	v := TempUnixVolume(t, true, false)
-	defer _teardown(v)
-
-	_store(t, v, TEST_HASH, TEST_BLOCK)
-	_store(t, v, TEST_HASH_2, TEST_BLOCK_2)
-	_store(t, v, TEST_HASH_3, TEST_BLOCK_3)
-
-	sem := make(chan int)
-	go func(sem chan int) {
-		buf, err := v.Get(TEST_HASH)
-		if err != nil {
-			t.Errorf("err1: %v", err)
-		}
-		if bytes.Compare(buf, TEST_BLOCK) != 0 {
-			t.Errorf("buf should be %s, is %s", string(TEST_BLOCK), string(buf))
-		}
-		sem <- 1
-	}(sem)
-
-	go func(sem chan int) {
-		buf, err := v.Get(TEST_HASH_2)
-		if err != nil {
-			t.Errorf("err2: %v", err)
-		}
-		if bytes.Compare(buf, TEST_BLOCK_2) != 0 {
-			t.Errorf("buf should be %s, is %s", string(TEST_BLOCK_2), string(buf))
-		}
-		sem <- 1
-	}(sem)
-
-	go func(sem chan int) {
-		buf, err := v.Get(TEST_HASH_3)
-		if err != nil {
-			t.Errorf("err3: %v", err)
-		}
-		if bytes.Compare(buf, TEST_BLOCK_3) != 0 {
-			t.Errorf("buf should be %s, is %s", string(TEST_BLOCK_3), string(buf))
-		}
-		sem <- 1
-	}(sem)
+func TestUnixVolumeGetFuncWorkerError(t *testing.T) {
+	v := NewTestableUnixVolume(t, false, false)
+	defer v.Teardown()
 
-	// Wait for all goroutines to finish
-	for done := 0; done < 3; {
-		done += <-sem
+	v.Put(context.Background(), TestHash, TestBlock)
+	mockErr := errors.New("Mock error")
+	err := v.getFunc(context.Background(), v.blockPath(TestHash), func(rdr io.Reader) error {
+		return mockErr
+	})
+	if err != mockErr {
+		t.Errorf("Got %v, expected %v", err, mockErr)
 	}
 }
 
-func TestPutSerialized(t *testing.T) {
-	// Create a volume with I/O serialization enabled.
-	v := TempUnixVolume(t, true, false)
-	defer _teardown(v)
+func TestUnixVolumeGetFuncFileError(t *testing.T) {
+	v := NewTestableUnixVolume(t, false, false)
+	defer v.Teardown()
 
-	sem := make(chan int)
-	go func(sem chan int) {
-		err := v.Put(TEST_HASH, TEST_BLOCK)
-		if err != nil {
-			t.Errorf("err1: %v", err)
-		}
-		sem <- 1
-	}(sem)
+	funcCalled := false
+	err := v.getFunc(context.Background(), v.blockPath(TestHash), func(rdr io.Reader) error {
+		funcCalled = true
+		return nil
+	})
+	if err == nil {
+		t.Errorf("Expected error opening non-existent file")
+	}
+	if funcCalled {
+		t.Errorf("Worker func should not have been called")
+	}
+}
 
-	go func(sem chan int) {
-		err := v.Put(TEST_HASH_2, TEST_BLOCK_2)
-		if err != nil {
-			t.Errorf("err2: %v", err)
-		}
-		sem <- 1
-	}(sem)
+func TestUnixVolumeGetFuncWorkerWaitsOnMutex(t *testing.T) {
+	v := NewTestableUnixVolume(t, false, false)
+	defer v.Teardown()
+
+	v.Put(context.Background(), TestHash, TestBlock)
+
+	mtx := NewMockMutex()
+	v.locker = mtx
+
+	funcCalled := make(chan struct{})
+	go v.getFunc(context.Background(), v.blockPath(TestHash), func(rdr io.Reader) error {
+		funcCalled <- struct{}{}
+		return nil
+	})
+	select {
+	case mtx.AllowLock <- struct{}{}:
+	case <-funcCalled:
+		t.Fatal("Function was called before mutex was acquired")
+	case <-time.After(5 * time.Second):
+		t.Fatal("Timed out before mutex was acquired")
+	}
+	select {
+	case <-funcCalled:
+	case mtx.AllowUnlock <- struct{}{}:
+		t.Fatal("Mutex was released before function was called")
+	case <-time.After(5 * time.Second):
+		t.Fatal("Timed out waiting for funcCalled")
+	}
+	select {
+	case mtx.AllowUnlock <- struct{}{}:
+	case <-time.After(5 * time.Second):
+		t.Fatal("Timed out waiting for getFunc() to release mutex")
+	}
+}
 
-	go func(sem chan int) {
-		err := v.Put(TEST_HASH_3, TEST_BLOCK_3)
-		if err != nil {
-			t.Errorf("err3: %v", err)
-		}
-		sem <- 1
-	}(sem)
+func TestUnixVolumeCompare(t *testing.T) {
+	v := NewTestableUnixVolume(t, false, false)
+	defer v.Teardown()
 
-	// Wait for all goroutines to finish
-	for done := 0; done < 2; {
-		done += <-sem
+	v.Put(context.Background(), TestHash, TestBlock)
+	err := v.Compare(context.Background(), TestHash, TestBlock)
+	if err != nil {
+		t.Errorf("Got err %q, expected nil", err)
 	}
 
-	// Double check that we actually wrote the blocks we expected to write.
-	buf, err := v.Get(TEST_HASH)
-	if err != nil {
-		t.Errorf("Get #1: %v", err)
+	err = v.Compare(context.Background(), TestHash, []byte("baddata"))
+	if err != CollisionError {
+		t.Errorf("Got err %q, expected %q", err, CollisionError)
 	}
-	if bytes.Compare(buf, TEST_BLOCK) != 0 {
-		t.Errorf("Get #1: expected %s, got %s", string(TEST_BLOCK), string(buf))
+
+	v.Put(context.Background(), TestHash, []byte("baddata"))
+	err = v.Compare(context.Background(), TestHash, TestBlock)
+	if err != DiskHashError {
+		t.Errorf("Got err %q, expected %q", err, DiskHashError)
 	}
 
-	buf, err = v.Get(TEST_HASH_2)
-	if err != nil {
-		t.Errorf("Get #2: %v", err)
+	p := fmt.Sprintf("%s/%s/%s", v.Root, TestHash[:3], TestHash)
+	os.Chmod(p, 000)
+	err = v.Compare(context.Background(), TestHash, TestBlock)
+	if err == nil || strings.Index(err.Error(), "permission denied") < 0 {
+		t.Errorf("Got err %q, expected %q", err, "permission denied")
 	}
-	if bytes.Compare(buf, TEST_BLOCK_2) != 0 {
-		t.Errorf("Get #2: expected %s, got %s", string(TEST_BLOCK_2), string(buf))
+}
+
+func TestUnixVolumeContextCancelPut(t *testing.T) {
+	v := NewTestableUnixVolume(t, true, false)
+	defer v.Teardown()
+	v.locker.Lock()
+	ctx, cancel := context.WithCancel(context.Background())
+	go func() {
+		time.Sleep(50 * time.Millisecond)
+		cancel()
+		time.Sleep(50 * time.Millisecond)
+		v.locker.Unlock()
+	}()
+	err := v.Put(ctx, TestHash, TestBlock)
+	if err != context.Canceled {
+		t.Errorf("Put() returned %s -- expected short read / canceled", err)
 	}
+}
 
-	buf, err = v.Get(TEST_HASH_3)
+func TestUnixVolumeContextCancelGet(t *testing.T) {
+	v := NewTestableUnixVolume(t, false, false)
+	defer v.Teardown()
+	bpath := v.blockPath(TestHash)
+	v.PutRaw(TestHash, TestBlock)
+	os.Remove(bpath)
+	err := syscall.Mkfifo(bpath, 0600)
 	if err != nil {
-		t.Errorf("Get #3: %v", err)
-	}
-	if bytes.Compare(buf, TEST_BLOCK_3) != 0 {
-		t.Errorf("Get #3: expected %s, got %s", string(TEST_BLOCK_3), string(buf))
+		t.Fatalf("Mkfifo %s: %s", bpath, err)
+	}
+	defer os.Remove(bpath)
+	ctx, cancel := context.WithCancel(context.Background())
+	go func() {
+		time.Sleep(50 * time.Millisecond)
+		cancel()
+	}()
+	buf := make([]byte, len(TestBlock))
+	n, err := v.Get(ctx, TestHash, buf)
+	if n == len(TestBlock) || err != context.Canceled {
+		t.Errorf("Get() returned %d, %s -- expected short read / canceled", n, err)
 	}
 }
 
-func TestIsFull(t *testing.T) {
-	v := TempUnixVolume(t, false, false)
-	defer _teardown(v)
+var _ = check.Suite(&UnixVolumeSuite{})
 
-	full_path := v.root + "/full"
-	now := fmt.Sprintf("%d", time.Now().Unix())
-	os.Symlink(now, full_path)
-	if !v.IsFull() {
-		t.Errorf("%s: claims not to be full", v)
-	}
-	os.Remove(full_path)
+type UnixVolumeSuite struct {
+	volume *TestableUnixVolume
+}
 
-	// Test with an expired /full link.
-	expired := fmt.Sprintf("%d", time.Now().Unix()-3605)
-	os.Symlink(expired, full_path)
-	if v.IsFull() {
-		t.Errorf("%s: should no longer be full", v)
+func (s *UnixVolumeSuite) TearDownTest(c *check.C) {
+	if s.volume != nil {
+		s.volume.Teardown()
 	}
 }
 
-func TestNodeStatus(t *testing.T) {
-	v := TempUnixVolume(t, false, false)
-	defer _teardown(v)
+func (s *UnixVolumeSuite) TestStats(c *check.C) {
+	s.volume = NewTestableUnixVolume(c, false, false)
+	stats := func() string {
+		buf, err := json.Marshal(s.volume.InternalStats())
+		c.Check(err, check.IsNil)
+		return string(buf)
+	}
+
+	c.Check(stats(), check.Matches, `.*"StatOps":0,.*`)
+	c.Check(stats(), check.Matches, `.*"Errors":0,.*`)
+
+	loc := "acbd18db4cc2f85cedef654fccc4a4d8"
+	_, err := s.volume.Get(context.Background(), loc, make([]byte, 3))
+	c.Check(err, check.NotNil)
+	c.Check(stats(), check.Matches, `.*"StatOps":[^0],.*`)
+	c.Check(stats(), check.Matches, `.*"Errors":[^0],.*`)
+	c.Check(stats(), check.Matches, `.*"\*os\.PathError":[^0].*`)
+	c.Check(stats(), check.Matches, `.*"InBytes":0,.*`)
+	c.Check(stats(), check.Matches, `.*"OpenOps":0,.*`)
+	c.Check(stats(), check.Matches, `.*"CreateOps":0,.*`)
+
+	err = s.volume.Put(context.Background(), loc, []byte("foo"))
+	c.Check(err, check.IsNil)
+	c.Check(stats(), check.Matches, `.*"OutBytes":3,.*`)
+	c.Check(stats(), check.Matches, `.*"CreateOps":1,.*`)
+	c.Check(stats(), check.Matches, `.*"OpenOps":0,.*`)
+	c.Check(stats(), check.Matches, `.*"UtimesOps":0,.*`)
+
+	err = s.volume.Touch(loc)
+	c.Check(err, check.IsNil)
+	c.Check(stats(), check.Matches, `.*"FlockOps":1,.*`)
+	c.Check(stats(), check.Matches, `.*"OpenOps":1,.*`)
+	c.Check(stats(), check.Matches, `.*"UtimesOps":1,.*`)
+
+	_, err = s.volume.Get(context.Background(), loc, make([]byte, 3))
+	c.Check(err, check.IsNil)
+	err = s.volume.Compare(context.Background(), loc, []byte("foo"))
+	c.Check(err, check.IsNil)
+	c.Check(stats(), check.Matches, `.*"InBytes":6,.*`)
+	c.Check(stats(), check.Matches, `.*"OpenOps":3,.*`)
+
+	err = s.volume.Trash(loc)
+	c.Check(err, check.IsNil)
+	c.Check(stats(), check.Matches, `.*"FlockOps":2,.*`)
+}
 
-	// Get node status and make a basic sanity check.
-	volinfo := v.Status()
-	if volinfo.MountPoint != v.root {
-		t.Errorf("GetNodeStatus mount_point %s, expected %s", volinfo.MountPoint, v.root)
-	}
-	if volinfo.DeviceNum == 0 {
-		t.Errorf("uninitialized device_num in %v", volinfo)
-	}
-	if volinfo.BytesFree == 0 {
-		t.Errorf("uninitialized bytes_free in %v", volinfo)
-	}
-	if volinfo.BytesUsed == 0 {
-		t.Errorf("uninitialized bytes_used in %v", volinfo)
-	}
+func (s *UnixVolumeSuite) TestConfig(c *check.C) {
+	var cfg Config
+	err := yaml.Unmarshal([]byte(`
+Volumes:
+  - Type: Directory
+    StorageClasses: ["class_a", "class_b"]
+`), &cfg)
+
+	c.Check(err, check.IsNil)
+	c.Check(cfg.Volumes[0].GetStorageClasses(), check.DeepEquals, []string{"class_a", "class_b"})
 }