lib/model, lib/versioner: Drive version cleanup from scanner (fixes #6313) (#6693)

This change adds a separate config for the cleanup interval, and runs that cleanup from the main folder loop.

gui/default/index.html

@@ -314,6 +314,8 @@
                   <span ng-switch-when="unknown"><span class="hidden-xs" translate>Unknown</span><span class="visible-xs" aria-label="{{'Unknown' | translate}}"><i class="fas fa-fw fa-question-circle"></i></span></span>
                   <span ng-switch-when="unshared"><span class="hidden-xs" translate>Unshared</span><span class="visible-xs" aria-label="{{'Unshared' | translate}}"><i class="fas fa-fw fa-unlink"></i></span></span>
                   <span ng-switch-when="scan-waiting"><span class="hidden-xs" translate>Waiting to Scan</span><span class="visible-xs" aria-label="{{'Waiting to Scan' | translate}}"><i class="fas fa-fw fa-hourglass-half"></i></span></span>
+                  <span ng-switch-when="cleaning"><span class="hidden-xs" translate>Cleaning Versions</span><span class="visible-xs" aria-label="{{'Cleaning Versions' | translate}}"><i class="fas fa-fw fa-recycle"></i></span></span>
+                  <span ng-switch-when="clean-waiting"><span class="hidden-xs" translate>Waiting to Clean</span><span class="visible-xs" aria-label="{{'Waiting to Clean' | translate}}"><i class="fas fa-fw fa-hourglass-half"></i></span></span>
                   <span ng-switch-when="stopped"><span class="hidden-xs" translate>Stopped</span><span class="visible-xs" aria-label="{{'Stopped' | translate}}"><i class="fas fa-fw fa-stop"></i></span></span>
                   <span ng-switch-when="scanning">
                     <span class="hidden-xs" translate>Scanning</span>

gui/default/syncthing/core/syncthingController.js

@@ -824,7 +824,7 @@ angular.module('syncthing.core')
             if (status == 'paused') {
                 return 'default';
             }
-            if (status === 'syncing' || status === 'sync-preparing' || status === 'scanning') {
+            if (status === 'syncing' || status === 'sync-preparing' || status === 'scanning' || status === 'cleaning') {
                 return 'primary';
             }
             if (status === 'unknown') {
@@ -833,7 +833,7 @@ angular.module('syncthing.core')
             if (status === 'stopped' || status === 'outofsync' || status === 'error' || status === 'faileditems') {
                 return 'danger';
             }
-            if (status === 'unshared' || status === 'scan-waiting' || status === 'sync-waiting') {
+            if (status === 'unshared' || status === 'scan-waiting' || status === 'sync-waiting' || status === 'clean-waiting') {
                 return 'warning';
             }
 

lib/config/folderconfiguration.go

@@ -226,6 +226,11 @@ func (f *FolderConfiguration) prepare() {
 	if f.Versioning.Params == nil {
 		f.Versioning.Params = make(map[string]string)
 	}
+	if f.Versioning.CleanupIntervalS > MaxRescanIntervalS {
+		f.Versioning.CleanupIntervalS = MaxRescanIntervalS
+	} else if f.Versioning.CleanupIntervalS < 0 {
+		f.Versioning.CleanupIntervalS = 0
+	}
 
 	if f.WeakHashThresholdPct == 0 {
 		f.WeakHashThresholdPct = 25

lib/config/versioningconfiguration.go

@@ -7,21 +7,28 @@
 package config
 
 import (
+	"encoding/json"
 	"encoding/xml"
 	"sort"
+
+	"github.com/syncthing/syncthing/lib/util"
 )
 
+// VersioningConfiguration is used in the code and for JSON serialization
 type VersioningConfiguration struct {
-	Type   string            `xml:"type,attr" json:"type"`
-	Params map[string]string `json:"params"`
+	Type             string            `json:"type"`
+	Params           map[string]string `json:"params"`
+	CleanupIntervalS int               `json:"cleanupIntervalS" default:"3600"`
 }
 
-type InternalVersioningConfiguration struct {
-	Type   string          `xml:"type,attr,omitempty"`
-	Params []InternalParam `xml:"param"`
+// internalVersioningConfiguration is used in XML serialization
+type internalVersioningConfiguration struct {
+	Type             string          `xml:"type,attr,omitempty"`
+	Params           []internalParam `xml:"param"`
+	CleanupIntervalS int             `xml:"cleanupIntervalS" default:"3600"`
 }
 
-type InternalParam struct {
+type internalParam struct {
 	Key string `xml:"key,attr"`
 	Val string `xml:"val,attr"`
 }
@@ -35,31 +42,45 @@ func (c VersioningConfiguration) Copy() VersioningConfiguration {
 	return cp
 }
 
+func (c *VersioningConfiguration) UnmarshalJSON(data []byte) error {
+	util.SetDefaults(c)
+	type noCustomUnmarshal VersioningConfiguration
+	ptr := (*noCustomUnmarshal)(c)
+	return json.Unmarshal(data, ptr)
+}
+
+func (c *VersioningConfiguration) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	var intCfg internalVersioningConfiguration
+	util.SetDefaults(&intCfg)
+	if err := d.DecodeElement(&intCfg, &start); err != nil {
+		return err
+	}
+	c.fromInternal(intCfg)
+	return nil
+}
+
 func (c *VersioningConfiguration) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
-	var tmp InternalVersioningConfiguration
+	return e.Encode(c.toInternal())
+}
+
+func (c *VersioningConfiguration) toInternal() internalVersioningConfiguration {
+	var tmp internalVersioningConfiguration
 	tmp.Type = c.Type
+	tmp.CleanupIntervalS = c.CleanupIntervalS
 	for k, v := range c.Params {
-		tmp.Params = append(tmp.Params, InternalParam{k, v})
+		tmp.Params = append(tmp.Params, internalParam{k, v})
 	}
 	sort.Slice(tmp.Params, func(a, b int) bool {
 		return tmp.Params[a].Key < tmp.Params[b].Key
 	})
-
-	return e.EncodeElement(tmp, start)
-
+	return tmp
 }
 
-func (c *VersioningConfiguration) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
-	var tmp InternalVersioningConfiguration
-	err := d.DecodeElement(&tmp, &start)
-	if err != nil {
-		return err
-	}
-
-	c.Type = tmp.Type
-	c.Params = make(map[string]string, len(tmp.Params))
-	for _, p := range tmp.Params {
+func (c *VersioningConfiguration) fromInternal(intCfg internalVersioningConfiguration) {
+	c.Type = intCfg.Type
+	c.CleanupIntervalS = intCfg.CleanupIntervalS
+	c.Params = make(map[string]string, len(intCfg.Params))
+	for _, p := range intCfg.Params {
 		c.Params[p.Key] = p.Val
 	}
-	return nil
 }

lib/model/folder.go

@@ -29,6 +29,7 @@ import (
 	"github.com/syncthing/syncthing/lib/stats"
 	"github.com/syncthing/syncthing/lib/sync"
 	"github.com/syncthing/syncthing/lib/util"
+	"github.com/syncthing/syncthing/lib/versioner"
 	"github.com/syncthing/syncthing/lib/watchaggregator"
 
 	"github.com/thejerf/suture"
@@ -49,12 +50,14 @@ type folder struct {
 	ignores *ignore.Matcher
 	ctx     context.Context
 
-	scanInterval        time.Duration
-	scanTimer           *time.Timer
-	scanDelay           chan time.Duration
-	initialScanFinished chan struct{}
-	scanErrors          []FileError
-	scanErrorsMut       sync.Mutex
+	scanInterval           time.Duration
+	scanTimer              *time.Timer
+	scanDelay              chan time.Duration
+	initialScanFinished    chan struct{}
+	scanErrors             []FileError
+	scanErrorsMut          sync.Mutex
+	versionCleanupInterval time.Duration
+	versionCleanupTimer    *time.Timer
 
 	pullScheduled chan struct{}
 	pullPause     time.Duration
@@ -72,7 +75,8 @@ type folder struct {
 	watchErr         error
 	watchMut         sync.Mutex
 
-	puller puller
+	puller    puller
+	versioner versioner.Versioner
 }
 
 type syncRequest struct {
@@ -81,10 +85,10 @@ type syncRequest struct {
 }
 
 type puller interface {
-	pull() bool // true when successfull and should not be retried
+	pull() bool // true when successful and should not be retried
 }
 
-func newFolder(model *model, fset *db.FileSet, ignores *ignore.Matcher, cfg config.FolderConfiguration, evLogger events.Logger, ioLimiter *byteSemaphore) folder {
+func newFolder(model *model, fset *db.FileSet, ignores *ignore.Matcher, cfg config.FolderConfiguration, evLogger events.Logger, ioLimiter *byteSemaphore, ver versioner.Versioner) folder {
 	f := folder{
 		stateTracker:              newStateTracker(cfg.ID, evLogger),
 		FolderConfiguration:       cfg,
@@ -96,11 +100,13 @@ func newFolder(model *model, fset *db.FileSet, ignores *ignore.Matcher, cfg conf
 		fset:    fset,
 		ignores: ignores,
 
-		scanInterval:        time.Duration(cfg.RescanIntervalS) * time.Second,
-		scanTimer:           time.NewTimer(time.Millisecond), // The first scan should be done immediately.
-		scanDelay:           make(chan time.Duration),
-		initialScanFinished: make(chan struct{}),
-		scanErrorsMut:       sync.NewMutex(),
+		scanInterval:           time.Duration(cfg.RescanIntervalS) * time.Second,
+		scanTimer:              time.NewTimer(0), // The first scan should be done immediately.
+		scanDelay:              make(chan time.Duration),
+		initialScanFinished:    make(chan struct{}),
+		scanErrorsMut:          sync.NewMutex(),
+		versionCleanupInterval: time.Duration(cfg.Versioning.CleanupIntervalS) * time.Second,
+		versionCleanupTimer:    time.NewTimer(time.Duration(cfg.Versioning.CleanupIntervalS) * time.Second),
 
 		pullScheduled: make(chan struct{}, 1), // This needs to be 1-buffered so that we queue a pull if we're busy when it comes.
 
@@ -113,6 +119,8 @@ func newFolder(model *model, fset *db.FileSet, ignores *ignore.Matcher, cfg conf
 		watchCancel:      func() {},
 		restartWatchChan: make(chan struct{}, 1),
 		watchMut:         sync.NewMutex(),
+
+		versioner: ver,
 	}
 	f.pullPause = f.pullBasePause()
 	f.pullFailTimer = time.NewTimer(0)
@@ -131,6 +139,7 @@ func (f *folder) serve(ctx context.Context) {
 
 	defer func() {
 		f.scanTimer.Stop()
+		f.versionCleanupTimer.Stop()
 		f.setState(FolderIdle)
 	}()
 
@@ -138,6 +147,14 @@ func (f *folder) serve(ctx context.Context) {
 		f.startWatch()
 	}
 
+	// If we're configured to not do version cleanup, or we don't have a
+	// versioner, cancel and drain that timer now.
+	if f.versionCleanupInterval == 0 || f.versioner == nil {
+		if !f.versionCleanupTimer.Stop() {
+			<-f.versionCleanupTimer.C
+		}
+	}
+
 	initialCompleted := f.initialScanFinished
 
 	for {
@@ -181,6 +198,10 @@ func (f *folder) serve(ctx context.Context) {
 		case <-f.restartWatchChan:
 			l.Debugln(f, "Restart watcher")
 			f.restartWatch()
+
+		case <-f.versionCleanupTimer.C:
+			l.Debugln(f, "Doing version cleanup")
+			f.versionCleanupTimerFired()
 		}
 	}
 }
@@ -701,6 +722,24 @@ func (f *folder) scanTimerFired() {
 	f.Reschedule()
 }
 
+func (f *folder) versionCleanupTimerFired() {
+	f.setState(FolderCleanWaiting)
+	defer f.setState(FolderIdle)
+
+	if err := f.ioLimiter.takeWithContext(f.ctx, 1); err != nil {
+		return
+	}
+	defer f.ioLimiter.give(1)
+
+	f.setState(FolderCleaning)
+
+	if err := f.versioner.Clean(f.ctx); err != nil {
+		l.Infoln("Failed to clean versions in %s: %v", f.Description(), err)
+	}
+
+	f.versionCleanupTimer.Reset(f.versionCleanupInterval)
+}
+
 func (f *folder) WatchError() error {
 	f.watchMut.Lock()
 	defer f.watchMut.Unlock()

lib/model/folder_sendonly.go

@@ -27,7 +27,7 @@ type sendOnlyFolder struct {
 
 func newSendOnlyFolder(model *model, fset *db.FileSet, ignores *ignore.Matcher, cfg config.FolderConfiguration, _ versioner.Versioner, _ fs.Filesystem, evLogger events.Logger, ioLimiter *byteSemaphore) service {
 	f := &sendOnlyFolder{
-		folder: newFolder(model, fset, ignores, cfg, evLogger, ioLimiter),
+		folder: newFolder(model, fset, ignores, cfg, evLogger, ioLimiter, nil),
 	}
 	f.folder.puller = f
 	f.folder.Service = util.AsService(f.serve, f.String())

lib/model/folder_sendrecv.go

@@ -123,8 +123,7 @@ type dbUpdateJob struct {
 type sendReceiveFolder struct {
 	folder
 
-	fs        fs.Filesystem
-	versioner versioner.Versioner
+	fs fs.Filesystem
 
 	queue              *jobQueue
 	blockPullReorderer blockPullReorderer
@@ -137,9 +136,8 @@ type sendReceiveFolder struct {
 
 func newSendReceiveFolder(model *model, fset *db.FileSet, ignores *ignore.Matcher, cfg config.FolderConfiguration, ver versioner.Versioner, fs fs.Filesystem, evLogger events.Logger, ioLimiter *byteSemaphore) service {
 	f := &sendReceiveFolder{
-		folder:             newFolder(model, fset, ignores, cfg, evLogger, ioLimiter),
+		folder:             newFolder(model, fset, ignores, cfg, evLogger, ioLimiter, ver),
 		fs:                 fs,
-		versioner:          ver,
 		queue:              newJobQueue(),
 		blockPullReorderer: newBlockPullReorderer(cfg.BlockPullOrder, model.id, cfg.DeviceIDs()),
 		writeLimiter:       newByteSemaphore(cfg.MaxConcurrentWrites),

lib/model/folderstate.go

@@ -22,6 +22,8 @@ const (
 	FolderSyncWaiting
 	FolderSyncPreparing
 	FolderSyncing
+	FolderCleaning
+	FolderCleanWaiting
 	FolderError
 )
 
@@ -39,6 +41,10 @@ func (s folderState) String() string {
 		return "sync-preparing"
 	case FolderSyncing:
 		return "syncing"
+	case FolderCleaning:
+		return "cleaning"
+	case FolderCleanWaiting:
+		return "clean-waiting"
 	case FolderError:
 		return "error"
 	default:

lib/model/model.go

@@ -133,15 +133,15 @@ type model struct {
 	folderIOLimiter *byteSemaphore
 
 	// fields protected by fmut
-	fmut               sync.RWMutex
-	folderCfgs         map[string]config.FolderConfiguration                  // folder -> cfg
-	folderFiles        map[string]*db.FileSet                                 // folder -> files
-	deviceStatRefs     map[protocol.DeviceID]*stats.DeviceStatisticsReference // deviceID -> statsRef
-	folderIgnores      map[string]*ignore.Matcher                             // folder -> matcher object
-	folderRunners      map[string]service                                     // folder -> puller or scanner
-	folderRunnerTokens map[string][]suture.ServiceToken                       // folder -> tokens for puller or scanner
-	folderRestartMuts  syncMutexMap                                           // folder -> restart mutex
-	folderVersioners   map[string]versioner.Versioner                         // folder -> versioner (may be nil)
+	fmut              sync.RWMutex
+	folderCfgs        map[string]config.FolderConfiguration                  // folder -> cfg
+	folderFiles       map[string]*db.FileSet                                 // folder -> files
+	deviceStatRefs    map[protocol.DeviceID]*stats.DeviceStatisticsReference // deviceID -> statsRef
+	folderIgnores     map[string]*ignore.Matcher                             // folder -> matcher object
+	folderRunners     map[string]service                                     // folder -> puller or scanner
+	folderRunnerToken map[string]suture.ServiceToken                         // folder -> token for folder runner
+	folderRestartMuts syncMutexMap                                           // folder -> restart mutex
+	folderVersioners  map[string]versioner.Versioner                         // folder -> versioner (may be nil)
 
 	// fields protected by pmut
 	pmut                sync.RWMutex
@@ -207,14 +207,14 @@ func NewModel(cfg config.Wrapper, id protocol.DeviceID, clientName, clientVersio
 		folderIOLimiter:      newByteSemaphore(cfg.Options().MaxFolderConcurrency()),
 
 		// fields protected by fmut
-		fmut:               sync.NewRWMutex(),
-		folderCfgs:         make(map[string]config.FolderConfiguration),
-		folderFiles:        make(map[string]*db.FileSet),
-		deviceStatRefs:     make(map[protocol.DeviceID]*stats.DeviceStatisticsReference),
-		folderIgnores:      make(map[string]*ignore.Matcher),
-		folderRunners:      make(map[string]service),
-		folderRunnerTokens: make(map[string][]suture.ServiceToken),
-		folderVersioners:   make(map[string]versioner.Versioner),
+		fmut:              sync.NewRWMutex(),
+		folderCfgs:        make(map[string]config.FolderConfiguration),
+		folderFiles:       make(map[string]*db.FileSet),
+		deviceStatRefs:    make(map[protocol.DeviceID]*stats.DeviceStatisticsReference),
+		folderIgnores:     make(map[string]*ignore.Matcher),
+		folderRunners:     make(map[string]service),
+		folderRunnerToken: make(map[string]suture.ServiceToken),
+		folderVersioners:  make(map[string]versioner.Versioner),
 
 		// fields protected by pmut
 		pmut:                sync.NewRWMutex(),
@@ -346,13 +346,6 @@ func (m *model) addAndStartFolderLockedWithIgnores(cfg config.FolderConfiguratio
 		if err != nil {
 			panic(fmt.Errorf("creating versioner: %w", err))
 		}
-		if service, ok := ver.(suture.Service); ok {
-			// The versioner implements the suture.Service interface, so
-			// expects to be run in the background in addition to being called
-			// when files are going to be archived.
-			token := m.Add(service)
-			m.folderRunnerTokens[folder] = append(m.folderRunnerTokens[folder], token)
-		}
 	}
 	m.folderVersioners[folder] = ver
 
@@ -362,8 +355,7 @@ func (m *model) addAndStartFolderLockedWithIgnores(cfg config.FolderConfiguratio
 
 	m.warnAboutOverwritingProtectedFiles(cfg, ignores)
 
-	token := m.Add(p)
-	m.folderRunnerTokens[folder] = append(m.folderRunnerTokens[folder], token)
+	m.folderRunnerToken[folder] = m.Add(p)
 
 	l.Infof("Ready to synchronize %s (%s)", cfg.Description(), cfg.Type)
 }
@@ -430,11 +422,11 @@ func (m *model) stopFolder(cfg config.FolderConfiguration, err error) {
 	// Stop the services running for this folder and wait for them to finish
 	// stopping to prevent races on restart.
 	m.fmut.RLock()
-	tokens := m.folderRunnerTokens[cfg.ID]
+	token, ok := m.folderRunnerToken[cfg.ID]
 	m.fmut.RUnlock()
 
-	for _, id := range tokens {
-		m.RemoveAndWait(id, 0)
+	if ok {
+		m.RemoveAndWait(token, 0)
 	}
 
 	// Wait for connections to stop to ensure that no more calls to methods
@@ -449,7 +441,7 @@ func (m *model) cleanupFolderLocked(cfg config.FolderConfiguration) {
 	delete(m.folderFiles, cfg.ID)
 	delete(m.folderIgnores, cfg.ID)
 	delete(m.folderRunners, cfg.ID)
-	delete(m.folderRunnerTokens, cfg.ID)
+	delete(m.folderRunnerToken, cfg.ID)
 	delete(m.folderVersioners, cfg.ID)
 }
 

lib/versioner/external.go

@@ -7,6 +7,7 @@
 package versioner
 
 import (
+	"context"
 	"errors"
 	"os"
 	"os/exec"
@@ -115,3 +116,7 @@ func (v external) GetVersions() (map[string][]FileVersion, error) {
 func (v external) Restore(filePath string, versionTime time.Time) error {
 	return ErrRestorationNotSupported
 }
+
+func (v external) Clean(_ context.Context) error {
+	return nil
+}

lib/versioner/simple.go

@@ -7,6 +7,7 @@
 package versioner
 
 import (
+	"context"
 	"strconv"
 	"time"
 
@@ -73,3 +74,7 @@ func (v simple) GetVersions() (map[string][]FileVersion, error) {
 func (v simple) Restore(filepath string, versionTime time.Time) error {
 	return restoreFile(v.copyRangeMethod, v.versionsFs, v.folderFs, filepath, versionTime, TagFilename)
 }
+
+func (v simple) Clean(_ context.Context) error {
+	return nil
+}

lib/versioner/staggered.go

@@ -13,12 +13,8 @@ import (
 	"strconv"
 	"time"
 
-	"github.com/thejerf/suture"
-
 	"github.com/syncthing/syncthing/lib/config"
 	"github.com/syncthing/syncthing/lib/fs"
-	"github.com/syncthing/syncthing/lib/sync"
-	"github.com/syncthing/syncthing/lib/util"
 )
 
 func init() {
@@ -32,15 +28,10 @@ type interval struct {
 }
 
 type staggered struct {
-	suture.Service
-	cleanInterval   int64
 	folderFs        fs.Filesystem
 	versionsFs      fs.Filesystem
 	interval        [4]interval
 	copyRangeMethod fs.CopyRangeMethod
-	mutex           sync.Mutex
-
-	testCleanDone chan struct{}
 }
 
 func newStaggered(cfg config.FolderConfiguration) Versioner {
@@ -49,19 +40,14 @@ func newStaggered(cfg config.FolderConfiguration) Versioner {
 	if err != nil {
 		maxAge = 31536000 // Default: ~1 year
 	}
-	cleanInterval, err := strconv.ParseInt(params["cleanInterval"], 10, 0)
-	if err != nil {
-		cleanInterval = 3600 // Default: clean once per hour
-	}
 
 	// Backwards compatibility
 	params["fsPath"] = params["versionsPath"]
 	versionsFs := versionerFsFromFolderCfg(cfg)
 
 	s := &staggered{
-		cleanInterval: cleanInterval,
-		folderFs:      cfg.Filesystem(),
-		versionsFs:    versionsFs,
+		folderFs:   cfg.Filesystem(),
+		versionsFs: versionsFs,
 		interval: [4]interval{
 			{30, 60 * 60},                     // first hour -> 30 sec between versions
 			{60 * 60, 24 * 60 * 60},           // next day -> 1 h between versions
@@ -69,41 +55,18 @@ func newStaggered(cfg config.FolderConfiguration) Versioner {
 			{7 * 24 * 60 * 60, maxAge},        // next year -> 1 week between versions
 		},
 		copyRangeMethod: cfg.CopyRangeMethod,
-		mutex:           sync.NewMutex(),
 	}
-	s.Service = util.AsService(s.serve, s.String())
 
 	l.Debugf("instantiated %#v", s)
 	return s
 }
 
-func (v *staggered) serve(ctx context.Context) {
-	v.clean()
-	if v.testCleanDone != nil {
-		close(v.testCleanDone)
-	}
-
-	tck := time.NewTicker(time.Duration(v.cleanInterval) * time.Second)
-	defer tck.Stop()
-	for {
-		select {
-		case <-tck.C:
-			v.clean()
-		case <-ctx.Done():
-			return
-		}
-	}
-}
-
-func (v *staggered) clean() {
-	l.Debugln("Versioner clean: Waiting for lock on", v.versionsFs)
-	v.mutex.Lock()
-	defer v.mutex.Unlock()
+func (v *staggered) Clean(ctx context.Context) error {
 	l.Debugln("Versioner clean: Cleaning", v.versionsFs)
 
 	if _, err := v.versionsFs.Stat("."); fs.IsNotExist(err) {
 		// There is no need to clean a nonexistent dir.
-		return
+		return nil
 	}
 
 	versionsPerFile := make(map[string][]string)
@@ -113,6 +76,11 @@ func (v *staggered) clean() {
 		if err != nil {
 			return err
 		}
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+		}
 
 		if f.IsDir() && !f.IsSymlink() {
 			dirTracker.addDir(path)
@@ -134,16 +102,22 @@ func (v *staggered) clean() {
 
 	if err := v.versionsFs.Walk(".", walkFn); err != nil {
 		l.Warnln("Versioner: error scanning versions dir", err)
-		return
+		return err
 	}
 
 	for _, versionList := range versionsPerFile {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+		}
 		v.expire(versionList)
 	}
 
 	dirTracker.deleteEmptyDirs(v.versionsFs)
 
 	l.Debugln("Cleaner: Finished cleaning", v.versionsFs)
+	return nil
 }
 
 func (v *staggered) expire(versions []string) {
@@ -216,10 +190,6 @@ func (v *staggered) toRemove(versions []string, now time.Time) []string {
 // Archive moves the named file away to a version archive. If this function
 // returns nil, the named file does not exist any more (has been archived).
 func (v *staggered) Archive(filePath string) error {
-	l.Debugln("Waiting for lock on ", v.versionsFs)
-	v.mutex.Lock()
-	defer v.mutex.Unlock()
-
 	if err := archiveFile(v.copyRangeMethod, v.folderFs, v.versionsFs, filePath, TagFilename); err != nil {
 		return err
 	}

lib/versioner/trashcan.go

@@ -12,11 +12,8 @@ import (
 	"strconv"
 	"time"
 
-	"github.com/thejerf/suture"
-
 	"github.com/syncthing/syncthing/lib/config"
 	"github.com/syncthing/syncthing/lib/fs"
-	"github.com/syncthing/syncthing/lib/util"
 )
 
 func init() {
@@ -25,7 +22,6 @@ func init() {
 }
 
 type trashcan struct {
-	suture.Service
 	folderFs        fs.Filesystem
 	versionsFs      fs.Filesystem
 	cleanoutDays    int
@@ -42,7 +38,6 @@ func newTrashcan(cfg config.FolderConfiguration) Versioner {
 		cleanoutDays:    cleanoutDays,
 		copyRangeMethod: cfg.CopyRangeMethod,
 	}
-	s.Service = util.AsService(s.serve, s.String())
 
 	l.Debugf("instantiated %#v", s)
 	return s
@@ -56,37 +51,16 @@ func (t *trashcan) Archive(filePath string) error {
 	})
 }
 
-func (t *trashcan) serve(ctx context.Context) {
-	l.Debugln(t, "starting")
-	defer l.Debugln(t, "stopping")
-
-	// Do the first cleanup one minute after startup.
-	timer := time.NewTimer(time.Minute)
-	defer timer.Stop()
-
-	for {
-		select {
-		case <-ctx.Done():
-			return
-
-		case <-timer.C:
-			if t.cleanoutDays > 0 {
-				if err := t.cleanoutArchive(); err != nil {
-					l.Infoln("Cleaning trashcan:", err)
-				}
-			}
-
-			// Cleanups once a day should be enough.
-			timer.Reset(24 * time.Hour)
-		}
-	}
-}
-
 func (t *trashcan) String() string {
 	return fmt.Sprintf("trashcan@%p", t)
 }
 
-func (t *trashcan) cleanoutArchive() error {
+func (t *trashcan) Clean(ctx context.Context) error {
+	if t.cleanoutDays <= 0 {
+		// no cleanout requested
+		return nil
+	}
+
 	if _, err := t.versionsFs.Lstat("."); fs.IsNotExist(err) {
 		return nil
 	}
@@ -98,6 +72,11 @@ func (t *trashcan) cleanoutArchive() error {
 		if err != nil {
 			return err
 		}
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+		}
 
 		if info.IsDir() && !info.IsSymlink() {
 			dirTracker.addDir(path)

lib/versioner/trashcan_test.go

@@ -7,13 +7,14 @@
 package versioner
 
 import (
-	"github.com/syncthing/syncthing/lib/config"
+	"context"
 	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
 	"time"
 
+	"github.com/syncthing/syncthing/lib/config"
 	"github.com/syncthing/syncthing/lib/fs"
 )
 
@@ -65,7 +66,7 @@ func TestTrashcanCleanout(t *testing.T) {
 	}
 
 	versioner := newTrashcan(cfg).(*trashcan)
-	if err := versioner.cleanoutArchive(); err != nil {
+	if err := versioner.Clean(context.Background()); err != nil {
 		t.Fatal(err)
 	}
 

lib/versioner/versioner.go

@@ -9,6 +9,7 @@
 package versioner
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"time"
@@ -20,6 +21,7 @@ type Versioner interface {
 	Archive(filePath string) error
 	GetVersions() (map[string][]FileVersion, error)
 	Restore(filePath string, versionTime time.Time) error
+	Clean(context.Context) error
 }
 
 type FileVersion struct {