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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| //go:build linux | ||
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| package failpoint | ||
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| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "os" | ||
| "os/exec" | ||
| "path/filepath" | ||
| "strings" | ||
| "testing" | ||
| "time" | ||
|
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| "github.com/fuweid/go-dmflakey" | ||
| "github.com/stretchr/testify/assert" | ||
| "github.com/stretchr/testify/require" | ||
| "golang.org/x/sys/unix" | ||
| ) | ||
|
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| // TestRestartFromPowerFailure is to test data after unexpected power failure. | ||
| func TestRestartFromPowerFailure(t *testing.T) { | ||
| flakey := initFlakeyDevice(t, "") | ||
| root := flakey.rootfs() | ||
|
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| dbPath := filepath.Join(root, "boltdb") | ||
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| args := []string{"bbolt", "bench", | ||
| "-work", // keep the database | ||
| "-path", dbPath, | ||
| "-count=1000000000", | ||
| "-batch-size=5", // separate total count into multiple truncation | ||
| } | ||
| cmd := exec.Command(args[0], args[1:]...) | ||
| logger := &bytes.Buffer{} | ||
| cmd.Stdout = logger | ||
| cmd.Stderr = logger | ||
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| t.Logf("start %s", strings.Join(args, " ")) | ||
| require.NoError(t, cmd.Start(), "args: %v", args) | ||
| time.Sleep(3 * time.Second) | ||
|
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| defer func() { | ||
| if t.Failed() { | ||
| t.Logf("dump log:\n: %s", logger.String()) | ||
| } | ||
| }() | ||
|
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| t.Logf("simulate power failure") | ||
| require.NoError(t, cmd.Process.Kill()) | ||
| require.Error(t, cmd.Wait()) | ||
| require.NoError(t, flakey.powerFailure("")) | ||
|
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| st, err := os.Stat(dbPath) | ||
| require.NoError(t, err) | ||
| t.Logf("db size: %d", st.Size()) | ||
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| t.Logf("verify data") | ||
| output, err := exec.Command("bbolt", "check", dbPath).CombinedOutput() | ||
| require.NoError(t, err, "bbolt check output: %s", string(output)) | ||
| } | ||
|
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| // initFlakeyDevice inits flakey device with ext4 filesystem. | ||
| func initFlakeyDevice(t *testing.T, mntOpt string) *flakeyDevice { | ||
| imgDir := t.TempDir() | ||
| rootDir := t.TempDir() | ||
| fsType := dmflakey.FSTypeEXT4 | ||
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| flakey, err := dmflakey.InitFlakey("bbolt-failpoint", imgDir, fsType) | ||
| require.NoError(t, err, "init flakey device") | ||
| t.Cleanup(func() { | ||
| assert.NoError(t, flakey.Teardown()) | ||
| }) | ||
|
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| err = unix.Mount(flakey.DevicePath(), rootDir, string(fsType), 0, mntOpt) | ||
| require.NoError(t, err, "init rootfs with flakey device") | ||
| t.Cleanup(func() { | ||
| assert.NoError(t, unmount(rootDir)) | ||
| }) | ||
|
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| return &flakeyDevice{ | ||
| flakey: flakey, | ||
|
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| rootDir: rootDir, | ||
| } | ||
| } | ||
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| type flakeyDevice struct { | ||
| flakey dmflakey.Flakey | ||
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| rootDir string | ||
| } | ||
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| // rootfs returns the rootfs where flakey device mounts. | ||
| func (f *flakeyDevice) rootfs() string { | ||
| return f.rootDir | ||
| } | ||
|
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| // powerFailure drops all the pending writes and remount the rootfs. | ||
| func (f *flakeyDevice) powerFailure(mntOpt string) error { | ||
| if err := f.flakey.DropWrites(); err != nil { | ||
| return fmt.Errorf("failed to drop_writes: %w", err) | ||
| } | ||
|
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| if err := unmount(f.rootDir); err != nil { | ||
| return fmt.Errorf("failed to unmount rootfs %s: %w", f.rootDir, err) | ||
| } | ||
|
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| if err := f.flakey.AllowWrites(); err != nil { | ||
| return fmt.Errorf("failed to allow_writes: %w", err) | ||
| } | ||
|
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| if err := unix.Mount(f.flakey.DevicePath(), f.rootDir, string(f.flakey.Filesystem()), 0, mntOpt); err != nil { | ||
| return fmt.Errorf("failed to mount rootfs %s: %w", f.rootDir, err) | ||
| } | ||
| return nil | ||
| } | ||
|
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| func unmount(target string) error { | ||
| for i := 0; i < 50; i++ { | ||
| if err := unix.Unmount(target, 0); err != nil { | ||
| switch err { | ||
| case unix.EBUSY: | ||
| time.Sleep(500 * time.Millisecond) | ||
| continue | ||
| case unix.EINVAL: | ||
| default: | ||
| return fmt.Errorf("failed to umount %s: %w", target, err) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
| return unix.EBUSY | ||
| } |