You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: restore.go
    path of file: ./repos/moby/volume/service
    
    the code of the file until where you have to start completion: package service // import "github.com/docker/docker/volume/service"

import (
	"context"
	"sync"

	"github.com/containerd/log"
	"github.com/docker/docker/volume"
	bolt "go.etcd.io/bbolt"
)

// restore is called when a new volume store is created.
// It's primary purpose is to ensure that all drivers' refcounts are set based
// on known volumes after a restart.
// This only attempts to track volumes that are actually stored in the on-disk db.
// It does not probe the available drivers to find anything that may have been added
// out of band.
func (s *VolumeStore) restore() {
	var ls []volumeMetadata
	s.db.View(func(tx *bolt.Tx) error {
		ls = listMeta(tx)
		return nil
	})
	ctx := context.Background()

	chRemove := make(chan *volumeMetadata, len(ls))
	var wg sync.WaitGroup
	for _, meta := range ls {
		wg.Add(1)
		// this is potentially a very slow operation, so do it in a goroutine
		go func(meta volumeMetadata) {
			defer wg.Done()

			var v volume.Volume
			var err error
			if meta.Driver != "" {
				v, err = lookupVolume(ctx, s.drivers, meta.Driver, meta.Name)
				if err != nil && err != errNoSuchVolume {
					log.G(ctx).WithError(err).WithField("driver", meta.Driver).WithField("volume", meta.Name).Warn("Error restorin
    
func (s *VolumeStore) restore() {
	var ls []volumeMetadata
	s.db.View(func(tx *bolt.Tx) error {
		ls = listMeta(tx)
		return nil
	})
	ctx := context.Background()

	chRemove := make(chan *volumeMetadata, len(ls))
	var wg sync.WaitGroup
	for _, meta := range ls {
		wg.Add(1)
		// this is potentially a very slow operation, so do it in a goroutine
		go func(meta volumeMetadata) {
			defer wg.Done()

			var v volume.Volume
			var err error
			if meta.Driver != "" {
				v, err = lookupVolume(ctx, s.drivers, meta.Driver, meta.Name)
				if err != nil && err != errNoSuchVolume {
					log.G(ctx).WithError(err).WithField("driver", meta.Driver).WithField("volume", meta.Name).Warn("Error restoring volume")
					return
				}
				if v == nil {
					// doesn't exist in the driver, remove it from the db
					chRemove <- &meta
					return
				}
			} else {
				v, err = s.getVolume(ctx, meta.Name, meta.Driver)
				if err != nil {
					if err == errNoSuchVolume {
						chRemove <- &meta
					}
					return
				}

				meta.Driver = v.DriverName()
				if err := s.setMeta(v.Name(), meta); err != nil {
					log.G(ctx).WithError(err).WithField("driver", meta.Driver).WithField("volume", v.Name()).Warn("Error updating volume metadata on restore")
				}
			}

			// increment driver refcount
			s.drivers.CreateDriver(meta.Driver)

			// cache the volume
			s.globalLock.Lock()
			s.options[v.Name()] = meta.Options
			s.labels[v.Name()] = meta.Labels
			s.names[v.Name()] = v
			s.refs[v.Name()] = make(map[string]struct{})
			s.globalLock.Unlock()
		}(meta)
	}

	wg.Wait()
	close(chRemove)
	s.db.Update(func(tx *bolt.Tx) error {
		for meta := range chRemove {
			if err := removeMeta(tx, meta.Name); err != nil {
				log.G(ctx).WithField("volume", meta.Name).Warnf("Error removing stale entry from volume db: %v", err)
			}
		}
		return nil
	})
}