diff --git a/acp.go b/acp.go
index f43ef79..51d9ef9 100644
--- a/acp.go
+++ b/acp.go
@@ -2,48 +2,15 @@ package acp
 
 import (
 	"context"
-	"os"
 	"sync"
 
-	"github.com/schollz/progressbar/v3"
 	"github.com/sirupsen/logrus"
 )
 
-const (
-	StageIndex = iota
-	StageCopy
-	StageFinished
-)
-
 type Copyer struct {
 	*option
-
-	createFlag  int
-	stage       int64
-	copyedBytes int64
-	totalBytes  int64
-	copyedFiles int64
-	totalFiles  int64
-
-	updateProgressBar func(func(bar *progressbar.ProgressBar))
-	updateCopying     func(func(set map[int64]struct{}))
-	logf              func(l logrus.Level, format string, args ...any)
-
-	jobsLock      sync.Mutex
-	jobs          []*baseJob
-	noSpaceSource []*source
-
-	errsLock sync.Mutex
-	errors   []*Error
-
-	badDstsLock sync.Mutex
-	badDsts     map[string]error
-
-	readingFiles chan struct{}
-	writePipe    chan *writeJob
-	postPipe     chan *baseJob
-
 	running sync.WaitGroup
+	eventCh chan Event
 }
 
 func New(ctx context.Context, opts ...Option) (*Copyer, error) {
@@ -59,90 +26,92 @@ func New(ctx context.Context, opts ...Option) (*Copyer, error) {
 	}
 
 	c := &Copyer{
-		option: opt,
-		stage:  StageIndex,
-
-		updateProgressBar: func(f func(bar *progressbar.ProgressBar)) {},
-		updateCopying:     func(f func(set map[int64]struct{})) {},
-
-		badDsts:   make(map[string]error),
-		writePipe: make(chan *writeJob, 32),
-		postPipe:  make(chan *baseJob, 8),
-	}
-
-	c.createFlag = os.O_WRONLY | os.O_CREATE
-	if c.overwrite {
-		c.createFlag |= os.O_TRUNC
-	} else {
-		c.createFlag |= os.O_EXCL
-	}
-
-	if c.fromDevice.linear {
-		c.readingFiles = make(chan struct{}, 1)
-	}
-
-	if opt.logger != nil {
-		c.logf = func(l logrus.Level, format string, args ...any) { opt.logger.Logf(l, format, args...) }
-	} else {
-		c.logf = func(l logrus.Level, format string, args ...any) { logrus.StandardLogger().Logf(l, format, args...) }
+		option:  opt,
+		eventCh: make(chan Event, 128),
 	}
 
 	c.running.Add(1)
 	go wrap(ctx, func() { c.run(ctx) })
+
 	return c, nil
 }
 
-func (c *Copyer) Wait() *Report {
+func (c *Copyer) Wait() {
 	c.running.Wait()
-	return c.Report()
 }
 
-func (c *Copyer) run(ctx context.Context) {
+func (c *Copyer) run(ctx context.Context) error {
 	defer c.running.Done()
 
 	ctx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
-	if c.withProgressBar {
-		c.startProgressBar(ctx)
+	go wrap(ctx, func() { c.eventLoop(ctx) })
+
+	indexed, err := c.index(ctx)
+	if err != nil {
+		return err
 	}
 
-	c.index(ctx)
-	if !c.checkJobs() {
-		return
-	}
+	prepared := c.prepare(ctx, indexed)
+	copyed := c.copy(ctx, prepared)
+	c.cleanupJob(ctx, copyed)
 
-	if err := c.applyAutoFillLimit(); err != nil {
-		c.reportError("_autofill", err)
-		return
-	}
-
-	c.copy(ctx)
+	return nil
 }
 
-func (c *Copyer) reportError(file string, err error) {
-	e := &Error{Path: file, Err: err}
+func (c *Copyer) eventLoop(ctx context.Context) {
+	chans := make([]chan Event, len(c.eventHanders))
+	for idx := range chans {
+		chans[idx] = make(chan Event, 128)
+	}
+
+	for idx, ch := range chans {
+		handler := c.eventHanders[idx]
+		events := ch
+
+		go wrap(ctx, func() {
+			for {
+				e, ok := <-events
+				if !ok {
+					handler(&EventFinished{})
+					return
+				}
+				handler(e)
+			}
+		})
+	}
+
+	defer func() {
+		for _, ch := range chans {
+			close(ch)
+		}
+	}()
+	for {
+		select {
+		case e, ok := <-c.eventCh:
+			if !ok {
+				return
+			}
+			for _, ch := range chans {
+				ch <- e
+			}
+		case <-ctx.Done():
+			return
+		}
+	}
+}
+
+func (c *Copyer) logf(l logrus.Level, format string, args ...any) {
+	c.logger.Logf(l, format, args...)
+}
+
+func (c *Copyer) submit(e Event) {
+	c.eventCh <- e
+}
+
+func (c *Copyer) reportError(src, dst string, err error) {
+	e := &Error{Src: src, Dst: dst, Err: err}
 	c.logf(logrus.ErrorLevel, e.Error())
-
-	c.errsLock.Lock()
-	defer c.errsLock.Unlock()
-	c.errors = append(c.errors, e)
-}
-
-func (c *Copyer) getErrors() []*Error {
-	c.errsLock.Lock()
-	defer c.errsLock.Unlock()
-	return c.errors
-}
-
-func (c *Copyer) addBadDsts(dst string, err error) {
-	c.badDstsLock.Lock()
-	defer c.badDstsLock.Unlock()
-	c.badDsts[dst] = err
-}
-
-func (c *Copyer) getBadDsts() map[string]error {
-	c.errsLock.Lock()
-	defer c.errsLock.Unlock()
-	return c.badDsts
+	c.submit(&EventReportError{Error: e})
 }
diff --git a/autofill.go b/autofill.go
deleted file mode 100644
index 33a6827..0000000
--- a/autofill.go
+++ /dev/null
@@ -1,86 +0,0 @@
-package acp
-
-import (
-	"fmt"
-	"math"
-	"strings"
-)
-
-func (c *Copyer) applyAutoFillLimit() error {
-	if !c.autoFill {
-		return nil
-	}
-
-	counts := make(map[string]int, len(c.dst))
-	infos := make(map[string]*fileSystem, len(c.dst))
-	for _, d := range c.dst {
-		fsInfo, err := getFileSystem(d)
-		if err != nil {
-			return fmt.Errorf("get file system fail, %s, %w", d, err)
-		}
-
-		infos[d] = fsInfo
-		counts[d] = counts[d] + 1
-	}
-
-	min := int64(math.MaxInt64)
-	for mp, info := range infos {
-		size := info.AvailableSize / int64(counts[mp])
-		if size < min {
-			min = size
-		}
-	}
-
-	c.jobsLock.Lock()
-	defer c.jobsLock.Unlock()
-
-	idx := c.getAutoFillCutoffIdx(min)
-	if idx < 0 {
-		return nil
-	}
-	if idx == 0 {
-		return fmt.Errorf("cannot found available auto fill slice, filesystem_size= %d", min)
-	}
-
-	cutoff := c.jobs[idx:]
-	c.jobs = c.jobs[:idx]
-	last := ""
-	for _, job := range cutoff {
-		if job.parent != nil {
-			job.parent.done(job)
-		}
-		if strings.HasPrefix(job.source.relativePath, last) {
-			continue
-		}
-
-		c.noSpaceSource = append(c.noSpaceSource, job.source)
-		last = job.source.relativePath + "/"
-	}
-	return nil
-}
-
-func (c *Copyer) getAutoFillCutoffIdx(limit int64) int {
-	left := limit
-	targetIdx := -1
-	for idx, job := range c.jobs {
-		left -= job.size
-		if left < 0 {
-			targetIdx = idx
-		}
-	}
-	if targetIdx < 0 {
-		return -1
-	}
-
-	if c.autoFillSplitDepth <= 0 {
-		return targetIdx
-	}
-
-	for idx := targetIdx; idx >= 0; idx-- {
-		if strings.Count(c.jobs[idx].source.relativePath, "/") < c.autoFillSplitDepth {
-			return idx
-		}
-	}
-
-	return 0
-}
diff --git a/cleanup.go b/cleanup.go
new file mode 100644
index 0000000..26fa873
--- /dev/null
+++ b/cleanup.go
@@ -0,0 +1,27 @@
+package acp
+
+import (
+	"context"
+	"fmt"
+	"os"
+)
+
+func (c *Copyer) cleanupJob(ctx context.Context, copyed <-chan *baseJob) {
+	for {
+		select {
+		case job, ok := <-copyed:
+			if !ok {
+				return
+			}
+			for _, name := range job.successTargets {
+				if err := os.Chtimes(name, job.modTime, job.modTime); err != nil {
+					c.reportError(job.source.src(), name, fmt.Errorf("change info, chtimes fail, %w", err))
+				}
+			}
+
+			job.setStatus(jobStatusFinished)
+		case <-ctx.Done():
+			return
+		}
+	}
+}
diff --git a/cmd/acp/main.go b/cmd/acp/main.go
index 0d8f579..456bc77 100644
--- a/cmd/acp/main.go
+++ b/cmd/acp/main.go
@@ -2,25 +2,27 @@ package main
 
 import (
 	"context"
-	"encoding/json"
 	"flag"
+	"fmt"
 	"os"
 	"os/signal"
+	"unsafe"
 
 	"github.com/abc950309/acp"
+	jsoniter "github.com/json-iterator/go"
+	"github.com/modern-go/reflect2"
 	"github.com/sirupsen/logrus"
 )
 
 var (
 	withProgressBar = flag.Bool("p", true, "display progress bar")
 	notOverwrite    = flag.Bool("n", false, "not overwrite exist file")
-	continueReport  = flag.String("c", "", "continue with previous report, for auto fill circumstances")
-	noTarget        = flag.Bool("notarget", false, "do not have target, use as dir index tool")
-	reportPath      = flag.String("report", "", "json report storage path")
-	reportIndent    = flag.Bool("report-indent", false, "json report with indent")
-	fromLinear      = flag.Bool("from-linear", false, "copy from linear device, such like tape drive")
-	toLinear        = flag.Bool("to-linear", false, "copy to linear device, such like tape drive")
-	autoFillDepth   = flag.Int("auto-fill-depth", 0, "auto fill the whole filesystem, split by specify filepath depth, and report will output left filepaths")
+	// continueReport  = flag.String("c", "", "continue with previous report, for auto fill circumstances")
+	noTarget     = flag.Bool("notarget", false, "do not have target, use as dir index tool")
+	reportPath   = flag.String("report", "", "json report storage path")
+	reportIndent = flag.Bool("report-indent", false, "json report with indent")
+	fromLinear   = flag.Bool("from-linear", false, "copy from linear device, such like tape drive")
+	toLinear     = flag.Bool("to-linear", false, "copy to linear device, such like tape drive")
 
 	targetPaths []string
 )
@@ -61,29 +63,31 @@ func main() {
 	}()
 
 	opts := make([]acp.Option, 0, 8)
-	if *continueReport != "" {
-		f, err := os.Open(*continueReport)
-		if err != nil {
-			logrus.Fatalf("cannot open continue report file, %s", err)
-		}
+	opts = append(opts, acp.Source(sources...))
+	// if *continueReport != "" {
+	// 	f, err := os.Open(*continueReport)
+	// 	if err != nil {
+	// 		logrus.Fatalf("cannot open continue report file, %s", err)
+	// 	}
 
-		r := new(acp.Report)
-		if err := json.NewDecoder(f).Decode(r); err != nil {
-			logrus.Fatalf("decode continue report file, %s", err)
-		}
+	// 	r := new(acp.Report)
+	// 	if err := json.NewDecoder(f).Decode(r); err != nil {
+	// 		logrus.Fatalf("decode continue report file, %s", err)
+	// 	}
 
-		for _, s := range r.NoSpaceSources {
-			logrus.Infof("restore unfinished: base= '%s' relative_path= '%v'", s.Base, s.RelativePaths)
-			opts = append(opts, acp.AccurateSource(s.Base, s.RelativePaths...))
-		}
-	} else {
-		opts = append(opts, acp.Source(sources...))
-	}
+	// 	for _, s := range r.NoSpaceSources {
+	// 		logrus.Infof("restore unfinished: base= '%s' relative_path= '%v'", s.Base, s.RelativePaths)
+	// 		opts = append(opts, acp.AccurateSource(s.Base, s.RelativePaths...))
+	// 	}
+	// }
 
 	opts = append(opts, acp.Target(targetPaths...))
 	opts = append(opts, acp.WithHash(*reportPath != ""))
 	opts = append(opts, acp.Overwrite(!*notOverwrite))
-	opts = append(opts, acp.WithProgressBar(*withProgressBar))
+
+	if *withProgressBar {
+		opts = append(opts, acp.WithProgressBar())
+	}
 
 	if *fromLinear {
 		opts = append(opts, acp.SetFromDevice(acp.LinearDevice(true)))
@@ -91,8 +95,33 @@ func main() {
 	if *toLinear {
 		opts = append(opts, acp.SetToDevice(acp.LinearDevice(true)))
 	}
-	if *autoFillDepth != 0 {
-		opts = append(opts, acp.WithAutoFill(true, *autoFillDepth))
+
+	if *reportPath != "" {
+		handler, getter := acp.NewReportGetter()
+		opts = append(opts, acp.WithEventHandler(handler))
+		defer func() {
+			if *reportPath == "" {
+				return
+			}
+
+			report := getter()
+			r, err := os.Create(*reportPath)
+			if err != nil {
+				logrus.Warnf("open report fail, path= '%s', err= %w", *reportPath, err)
+				logrus.Infof("report: %s", report)
+				return
+			}
+			defer r.Close()
+
+			var buf []byte
+			if *reportIndent {
+				buf, _ = reportJSON.MarshalIndent(report, "", "\t")
+			} else {
+				buf, _ = reportJSON.Marshal(report)
+			}
+
+			r.Write(buf)
+		}()
 	}
 
 	c, err := acp.New(ctx, opts...)
@@ -100,28 +129,42 @@ func main() {
 		logrus.Fatalf("unexpected exit: %s", err)
 	}
 
-	defer func() {
-		if *reportPath == "" {
-			return
-		}
-
-		report := c.Report()
-		r, err := os.Create(*reportPath)
-		if err != nil {
-			logrus.Warnf("open report fail, path= '%s', err= %w", *reportPath, err)
-			logrus.Infof("report: %s", report)
-			return
-		}
-		defer r.Close()
-
-		var buf []byte
-		if *reportIndent {
-			buf, _ = json.MarshalIndent(report, "", "\t")
-		} else {
-			buf, _ = json.Marshal(report)
-		}
-
-		r.Write(buf)
-	}()
 	c.Wait()
 }
+
+var (
+	reportJSON jsoniter.API
+)
+
+type errValCoder struct{}
+
+func (*errValCoder) IsEmpty(ptr unsafe.Pointer) bool {
+	val := (*error)(ptr)
+	return *val == nil
+}
+
+func (*errValCoder) Encode(ptr unsafe.Pointer, stream *jsoniter.Stream) {
+	val := (*error)(ptr)
+	stream.WriteString((*val).Error())
+}
+
+func (*errValCoder) Decode(ptr unsafe.Pointer, iter *jsoniter.Iterator) {
+	val := (*error)(ptr)
+	*val = fmt.Errorf(iter.ReadString())
+}
+
+func init() {
+	reportJSON = jsoniter.Config{
+		EscapeHTML:             true,
+		SortMapKeys:            true,
+		ValidateJsonRawMessage: true,
+	}.Froze()
+
+	var emptyErr error
+	reportJSON.RegisterExtension(jsoniter.EncoderExtension{
+		reflect2.TypeOf(emptyErr): &errValCoder{},
+	})
+	reportJSON.RegisterExtension(jsoniter.DecoderExtension{
+		reflect2.TypeOf(emptyErr): &errValCoder{},
+	})
+}
diff --git a/copy.go b/copy.go
index 2e30a8d..cd1d5f5 100644
--- a/copy.go
+++ b/copy.go
@@ -6,14 +6,16 @@ import (
 	"fmt"
 	"hash"
 	"os"
+	"path"
 	"sync"
 	"sync/atomic"
 	"syscall"
+	"time"
 
 	"github.com/abc950309/acp/mmap"
+	mapset "github.com/deckarep/golang-set/v2"
 	"github.com/hashicorp/go-multierror"
 	"github.com/minio/sha256-simd"
-	"github.com/sirupsen/logrus"
 )
 
 const (
@@ -24,121 +26,70 @@ var (
 	sha256Pool = &sync.Pool{New: func() interface{} { return sha256.New() }}
 )
 
-func (c *Copyer) copy(ctx context.Context) {
-	atomic.StoreInt64(&c.stage, StageCopy)
-	defer atomic.StoreInt64(&c.stage, StageFinished)
-	wg := new(sync.WaitGroup)
+func (c *Copyer) copy(ctx context.Context, prepared <-chan *writeJob) <-chan *baseJob {
+	ch := make(chan *baseJob, 128)
 
-	wg.Add(1)
+	var copying sync.WaitGroup
+	done := make(chan struct{})
+	defer func() {
+		go wrap(ctx, func() {
+			defer close(done)
+			defer close(ch)
+
+			copying.Wait()
+		})
+	}()
+
+	cntr := new(counter)
 	go wrap(ctx, func() {
-		defer wg.Done()
-		defer close(c.writePipe)
-
-		for _, job := range c.getJobs() {
-			c.prepare(ctx, job)
-
+		ticker := time.NewTicker(time.Second)
+		for {
 			select {
-			case <-ctx.Done():
+			case <-ticker.C:
+				c.submit(&EventUpdateProgress{Bytes: atomic.LoadInt64(&cntr.bytes), Files: atomic.LoadInt64(&cntr.files)})
+			case <-done:
+				c.submit(&EventUpdateProgress{Bytes: atomic.LoadInt64(&cntr.bytes), Files: atomic.LoadInt64(&cntr.files), Finished: true})
 				return
-			default:
 			}
 		}
 	})
 
-	for i := 0; i < c.threads; i++ {
-		wg.Add(1)
+	badDsts := mapset.NewSet[string]()
+	for idx := 0; idx < c.toDevice.threads; idx++ {
+		copying.Add(1)
 		go wrap(ctx, func() {
-			defer wg.Done()
+			defer copying.Done()
 
 			for {
 				select {
-				case job, ok := <-c.writePipe:
+				case <-ctx.Done():
+					return
+				case job, ok := <-prepared:
 					if !ok {
 						return
 					}
 
-					wg.Add(1)
-					c.write(ctx, job)
-				case <-ctx.Done():
-					return
+					wrap(ctx, func() { c.write(ctx, job, ch, cntr, badDsts) })
 				}
 			}
 		})
 	}
 
-	go wrap(ctx, func() {
-		for job := range c.postPipe {
-			c.post(wg, job)
-		}
-	})
-
-	finished := make(chan struct{}, 1)
-	go wrap(ctx, func() {
-		wg.Wait()
-		finished <- struct{}{}
-	})
-
-	select {
-	case <-finished:
-	case <-ctx.Done():
-	}
+	return ch
 }
 
-func (c *Copyer) prepare(ctx context.Context, job *baseJob) {
-	job.setStatus(jobStatusPreparing)
-
-	switch job.typ {
-	case jobTypeDir:
-		for _, d := range c.dst {
-			target := job.source.target(d)
-			if err := os.MkdirAll(target, job.mode&os.ModePerm); err != nil && !os.IsExist(err) {
-				c.reportError(target, fmt.Errorf("mkdir fail, %w", err))
-				job.fail(target, fmt.Errorf("mkdir fail, %w", err))
-				continue
-			}
-			job.succes(target)
-		}
-
-		c.writePipe <- &writeJob{baseJob: job}
-		return
-	}
-
-	if c.readingFiles != nil {
-		c.readingFiles <- struct{}{}
-	}
-
-	file, err := mmap.Open(job.source.path())
-	if err != nil {
-		c.reportError(job.source.path(), fmt.Errorf("open src file fail, %w", err))
-		return
-	}
-
-	c.writePipe <- &writeJob{baseJob: job, src: file}
-}
-
-func (c *Copyer) write(ctx context.Context, job *writeJob) {
+func (c *Copyer) write(ctx context.Context, job *writeJob, ch chan<- *baseJob, cntr *counter, badDsts mapset.Set[string]) {
 	job.setStatus(jobStatusCopying)
-	if job.typ != jobTypeNormal {
-		return
-	}
+	defer job.setStatus(jobStatusFinishing)
 
 	var wg sync.WaitGroup
 	defer func() {
 		wg.Wait()
-
-		job.src.Close()
-		if c.readingFiles != nil {
-			<-c.readingFiles
-		}
-
-		c.postPipe <- job.baseJob
+		job.done()
+		ch <- job.baseJob
 	}()
 
-	num := atomic.AddInt64(&c.copyedFiles, 1)
-	c.logf(logrus.InfoLevel, "[%d/%d] copying: %s", num, c.totalFiles, job.source.relativePath)
-	c.updateCopying(func(set map[int64]struct{}) { set[num] = struct{}{} })
-	defer c.updateCopying(func(set map[int64]struct{}) { delete(set, num) })
-
+	atomic.AddInt64(&cntr.files, 1)
 	chans := make([]chan []byte, 0, len(c.dst)+1)
 	defer func() {
 		for _, ch := range chans {
@@ -167,18 +118,21 @@ func (c *Copyer) write(ctx context.Context, job *writeJob) {
 	}
 
 	var readErr error
-	badDsts := c.getBadDsts()
 	for _, d := range c.dst {
 		dst := d
+		name := job.source.dst(dst)
 
-		name := job.source.target(dst)
-		if e, has := badDsts[dst]; has && e != nil {
-			job.fail(name, fmt.Errorf("bad target path, %w", e))
+		if badDsts.Contains(dst) {
+			job.fail(name, fmt.Errorf("bad target path"))
+			continue
+		}
+		if err := os.MkdirAll(path.Dir(name), os.ModePerm); err != nil {
+			job.fail(name, fmt.Errorf("mkdir dst dir fail, %w", err))
+			continue
 		}
 
 		file, err := os.OpenFile(name, c.createFlag, job.mode)
 		if err != nil {
-			c.reportError(name, fmt.Errorf("open dst file fail, %w", err))
 			job.fail(name, fmt.Errorf("open dst file fail, %w", err))
 			continue
 		}
@@ -206,11 +160,11 @@ func (c *Copyer) write(ctx context.Context, job *writeJob) {
 				}
 
 				// if no space
-				if errors.Is(err, syscall.ENOSPC) {
-					c.addBadDsts(dst, err)
+				if errors.Is(err, syscall.ENOSPC) || errors.Is(err, syscall.EROFS) {
+					badDsts.Add(dst)
 				}
 
-				c.reportError(name, rerr)
+				c.reportError(job.source.src(), name, rerr)
 				job.fail(name, rerr)
 			}()
 
@@ -236,10 +190,10 @@ func (c *Copyer) write(ctx context.Context, job *writeJob) {
 	if len(chans) == 0 {
 		return
 	}
-	readErr = c.streamCopy(ctx, chans, job.src)
+	readErr = c.streamCopy(ctx, chans, job.src, &cntr.bytes)
 }
 
-func (c *Copyer) streamCopy(ctx context.Context, dsts []chan []byte, src *mmap.ReaderAt) error {
+func (c *Copyer) streamCopy(ctx context.Context, dsts []chan []byte, src *mmap.ReaderAt, bytes *int64) error {
 	if src.Len() == 0 {
 		return nil
 	}
@@ -255,7 +209,7 @@ func (c *Copyer) streamCopy(ctx context.Context, dsts []chan []byte, src *mmap.R
 		}
 
 		nr := len(buf)
-		atomic.AddInt64(&c.copyedBytes, int64(nr))
+		atomic.AddInt64(bytes, int64(nr))
 		if nr < batchSize {
 			return nil
 		}
@@ -267,24 +221,3 @@ func (c *Copyer) streamCopy(ctx context.Context, dsts []chan []byte, src *mmap.R
 		}
 	}
 }
-
-func (c *Copyer) post(wg *sync.WaitGroup, job *baseJob) {
-	defer wg.Done()
-
-	job.setStatus(jobStatusFinishing)
-	for _, name := range job.successTargets {
-		if err := os.Chtimes(name, job.modTime, job.modTime); err != nil {
-			c.reportError(name, fmt.Errorf("change info, chtimes fail, %w", err))
-		}
-	}
-
-	job.setStatus(jobStatusFinished)
-	if job.parent == nil {
-		return
-	}
-
-	left := job.parent.done(job)
-	if left == 0 {
-		c.postPipe <- job.parent
-	}
-}
diff --git a/error.go b/error.go
new file mode 100644
index 0000000..a2eba58
--- /dev/null
+++ b/error.go
@@ -0,0 +1,42 @@
+package acp
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+var (
+	_ = error(new(Error))
+	_ = json.Marshaler(new(Error))
+	_ = json.Unmarshaler(new(Error))
+)
+
+type Error struct {
+	Src string `json:"src,omitempty"`
+	Dst string `json:"dst,omitempty"`
+	Err error  `json:"error,omitempty"`
+}
+
+type jsonError struct {
+	Src string `json:"src,omitempty"`
+	Dst string `json:"dst,omitempty"`
+	Err string `json:"error,omitempty"`
+}
+
+func (e *Error) Error() string {
+	return fmt.Sprintf("[%s => %s]: %s", e.Src, e.Dst, e.Err)
+}
+
+func (e *Error) MarshalJSON() ([]byte, error) {
+	return json.Marshal(&jsonError{Src: e.Src, Dst: e.Dst, Err: e.Err.Error()})
+}
+
+func (e *Error) UnmarshalJSON(buf []byte) error {
+	m := new(jsonError)
+	if err := json.Unmarshal(buf, &m); err != nil {
+		return err
+	}
+
+	e.Src, e.Dst, e.Err = m.Src, e.Dst, fmt.Errorf(m.Err)
+	return nil
+}
diff --git a/event.go b/event.go
new file mode 100644
index 0000000..3b99a1f
--- /dev/null
+++ b/event.go
@@ -0,0 +1,37 @@
+package acp
+
+type EventHandler func(Event)
+
+type Event interface {
+	iEvent()
+}
+
+type EventUpdateCount struct {
+	Bytes, Files int64
+	Finished     bool
+}
+
+func (*EventUpdateCount) iEvent() {}
+
+type EventUpdateProgress struct {
+	Bytes, Files int64
+	Finished     bool
+}
+
+func (*EventUpdateProgress) iEvent() {}
+
+type EventUpdateJob struct {
+	Job *Job
+}
+
+func (*EventUpdateJob) iEvent() {}
+
+type EventReportError struct {
+	Error *Error
+}
+
+func (*EventReportError) iEvent() {}
+
+type EventFinished struct{}
+
+func (*EventFinished) iEvent() {}
diff --git a/go.mod b/go.mod
index d7bedac..f91776f 100644
--- a/go.mod
+++ b/go.mod
@@ -10,10 +10,14 @@ require (
 )
 
 require (
+	github.com/deckarep/golang-set/v2 v2.1.0 // indirect
 	github.com/hashicorp/errwrap v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/cpuid/v2 v2.0.4 // indirect
 	github.com/mattn/go-runewidth v0.0.13 // indirect
 	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db // indirect
+	github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/rivo/uniseg v0.3.4 // indirect
 	golang.org/x/sys v0.0.0-20220829200755-d48e67d00261 // indirect
 	golang.org/x/term v0.0.0-20220722155259-a9ba230a4035 // indirect
diff --git a/index.go b/index.go
index 1b83c08..93b35d3 100644
--- a/index.go
+++ b/index.go
@@ -6,139 +6,123 @@ import (
 	"os"
 	"sort"
 	"sync/atomic"
-
-	"github.com/schollz/progressbar/v3"
+	"time"
 )
 
 const (
 	unexpectFileMode = os.ModeType &^ os.ModeDir
 )
 
-func (c *Copyer) index(ctx context.Context) {
-	for _, s := range c.src {
-		c.walk(nil, s)
-	}
-
-	c.updateProgressBar(func(bar *progressbar.ProgressBar) {
-		bar.ChangeMax64(atomic.LoadInt64(&c.totalBytes))
-		bar.Describe(fmt.Sprintf("[0/%d] index finished...", atomic.LoadInt64(&c.totalFiles)))
-	})
+type counter struct {
+	bytes, files int64
 }
 
-func (c *Copyer) walk(parent *baseJob, src *source) *baseJob {
-	path := src.path()
-
-	stat, err := os.Stat(path)
+func (c *Copyer) index(ctx context.Context) (<-chan *baseJob, error) {
+	jobs := c.walk(ctx)
+	filtered, err := c.joinJobs(jobs)
 	if err != nil {
-		c.reportError(path, fmt.Errorf("walk get stat, %w", err))
-		return nil
-	}
-	if stat.Mode()&unexpectFileMode != 0 {
-		return nil
+		return nil, err
 	}
 
-	job, err := newJobFromFileInfo(parent, src, stat)
-	if err != nil {
-		c.reportError(path, fmt.Errorf("make job fail, %w", err))
-		return nil
-	}
+	ch := make(chan *baseJob, 128)
+	go wrap(ctx, func() {
+		defer close(ch)
 
-	c.appendJobs(job)
-	if job.typ == jobTypeNormal {
-		totalBytes := atomic.AddInt64(&c.totalBytes, job.size)
-		totalFiles := atomic.AddInt64(&c.totalFiles, 1)
-
-		c.updateProgressBar(func(bar *progressbar.ProgressBar) {
-			bar.ChangeMax64(totalBytes)
-			bar.Describe(fmt.Sprintf("[0/%d] indexing...", totalFiles))
-		})
-
-		return job
-	}
-
-	files, err := os.ReadDir(path)
-	if err != nil {
-		c.reportError(path, fmt.Errorf("walk read dir, %w", err))
-		return nil
-	}
-
-	job.children = make(map[*baseJob]struct{}, len(files))
-	for _, file := range files {
-		id := c.walk(job, &source{base: src.base, relativePath: src.relativePath + "/" + file.Name()})
-		if id == nil {
-			continue
+		for _, job := range filtered {
+			select {
+			case <-ctx.Done():
+				return
+			case ch <- job:
+			}
 		}
-		job.children[id] = struct{}{}
-	}
+	})
 
-	return job
+	return ch, nil
 }
 
-func (c *Copyer) checkJobs() bool {
-	c.jobsLock.Lock()
-	defer c.jobsLock.Unlock()
+func (c *Copyer) walk(ctx context.Context) []*baseJob {
+	done := make(chan struct{})
+	defer close(done)
 
-	if len(c.jobs) == 0 {
-		c.reportError("", fmt.Errorf("cannot found available jobs"))
-		return false
+	cntr := new(counter)
+	go wrap(ctx, func() {
+		ticker := time.NewTicker(time.Second)
+		for {
+			select {
+			case <-ticker.C:
+				c.submit(&EventUpdateCount{Bytes: atomic.LoadInt64(&cntr.bytes), Files: atomic.LoadInt64(&cntr.files)})
+			case <-done:
+				c.submit(&EventUpdateCount{Bytes: atomic.LoadInt64(&cntr.bytes), Files: atomic.LoadInt64(&cntr.files), Finished: true})
+				return
+			}
+		}
+	})
+
+	jobs := make([]*baseJob, 0, 64)
+	appendJob := func(job *baseJob) {
+		jobs = append(jobs, job)
+		atomic.AddInt64(&cntr.files, 1)
+		atomic.AddInt64(&cntr.bytes, job.size)
 	}
 
-	sort.Slice(c.jobs, func(i int, j int) bool {
-		return c.jobs[i].comparableRelativePath < c.jobs[j].comparableRelativePath
+	var walk func(src *source)
+	walk = func(src *source) {
+		path := src.src()
+
+		stat, err := os.Stat(path)
+		if err != nil {
+			c.reportError(path, "", fmt.Errorf("walk get stat, %w", err))
+			return
+		}
+
+		mode := stat.Mode()
+		if mode&unexpectFileMode != 0 {
+			return
+		}
+		if !mode.IsDir() {
+			job, err := c.newJobFromFileInfo(src, stat)
+			if err != nil {
+				c.reportError(path, "", fmt.Errorf("make job fail, %w", err))
+				return
+			}
+
+			appendJob(job)
+			return
+		}
+
+		files, err := os.ReadDir(path)
+		if err != nil {
+			c.reportError(path, "", fmt.Errorf("walk read dir, %w", err))
+			return
+		}
+		for _, file := range files {
+			walk(src.append(file.Name()))
+		}
+
+		return
+	}
+	for _, s := range c.src {
+		walk(s)
+	}
+	return jobs
+}
+
+func (c *Copyer) joinJobs(jobs []*baseJob) ([]*baseJob, error) {
+	sort.Slice(jobs, func(i int, j int) bool {
+		return comparePath(jobs[i].source.path, jobs[j].source.path) < 0
 	})
 
 	var last *baseJob
-	filtered := make([]*baseJob, 0, len(c.jobs))
-	for _, job := range c.jobs {
-		if last == nil {
-			filtered = append(filtered, job)
-			last = job
-			continue
-		}
-		if last.source.relativePath != job.source.relativePath {
-			filtered = append(filtered, job)
-			last = job
+	filtered := make([]*baseJob, 0, len(jobs))
+	for _, job := range jobs {
+		if last != nil && comparePath(last.source.path, job.source.path) == 0 {
+			c.reportError(last.source.src(), "", fmt.Errorf("same relative path, ignored, '%s'", job.source.src()))
 			continue
 		}
 
-		if last.typ != job.typ {
-			c.reportError(job.source.path(), fmt.Errorf("same relative path with different type, '%s' and '%s'", job.source.path(), last.source.path()))
-			return false
-		}
-		if last.typ == jobTypeNormal {
-			c.reportError(job.source.path(), fmt.Errorf("same relative path as normal file, ignored, '%s'", job.source.path()))
-			continue
-		}
-
-		func() {
-			last.lock.Lock()
-			defer last.lock.Unlock()
-
-			for n := range job.children {
-				last.children[n] = struct{}{}
-				n.parent = last
-			}
-		}()
+		filtered = append(filtered, job)
+		last = job
 	}
 
-	c.jobs = filtered
-	return true
-}
-
-func (c *Copyer) appendJobs(jobs ...*baseJob) {
-	c.jobsLock.Lock()
-	defer c.jobsLock.Unlock()
-	c.jobs = append(c.jobs, jobs...)
-}
-
-func (c *Copyer) getJobs() []*baseJob {
-	c.jobsLock.Lock()
-	defer c.jobsLock.Unlock()
-	return c.jobs
-}
-
-func (c *Copyer) getJobsAndNoSpaceSource() ([]*baseJob, []*source) {
-	c.jobsLock.Lock()
-	defer c.jobsLock.Unlock()
-	return c.jobs, c.noSpaceSource
+	return filtered, nil
 }
diff --git a/job.go b/job.go
index 1d029d4..db38965 100644
--- a/job.go
+++ b/job.go
@@ -2,21 +2,14 @@ package acp
 
 import (
 	"encoding/hex"
+	"fmt"
 	"os"
-	"strings"
 	"sync"
 	"time"
 
 	"github.com/abc950309/acp/mmap"
 )
 
-type jobType uint8
-
-const (
-	jobTypeNormal = jobType(iota)
-	jobTypeDir
-)
-
 type jobStatus uint8
 
 const (
@@ -38,9 +31,8 @@ var (
 )
 
 type baseJob struct {
-	parent *baseJob
+	copyer *Copyer
 	source *source
-	typ    jobType
 
 	name    string      // base name of the file
 	size    int64       // length in bytes for regular files; system-dependent for others
@@ -50,32 +42,27 @@ type baseJob struct {
 	lock      sync.Mutex
 	writeTime time.Time
 	status    jobStatus
-	children  map[*baseJob]struct{}
 
 	successTargets []string
 	failedTargets  map[string]error
 	hash           []byte
-
-	// utils
-	comparableRelativePath string
 }
 
-func newJobFromFileInfo(parent *baseJob, source *source, info os.FileInfo) (*baseJob, error) {
+func (c *Copyer) newJobFromFileInfo(source *source, info os.FileInfo) (*baseJob, error) {
 	job := &baseJob{
-		parent: parent,
+		copyer: c,
 		source: source,
 
 		name:    info.Name(),
 		size:    info.Size(),
 		mode:    info.Mode(),
 		modTime: info.ModTime(),
-
-		comparableRelativePath: strings.ReplaceAll(source.relativePath, "/", "\x00"),
 	}
-	if job.mode.IsDir() {
-		job.typ = jobTypeDir
+	if job.mode.IsDir() || job.mode&unexpectFileMode != 0 {
+		return nil, fmt.Errorf("unexpected file, path= %s", source.src())
 	}
 
+	c.submit(&EventUpdateJob{job.report()})
 	return job, nil
 }
 
@@ -87,30 +74,24 @@ func (j *baseJob) setStatus(s jobStatus) {
 	if s == jobStatusCopying {
 		j.writeTime = time.Now()
 	}
+
+	j.copyer.submit(&EventUpdateJob{j.report()})
 }
 
 func (j *baseJob) setHash(h []byte) {
 	j.lock.Lock()
 	defer j.lock.Unlock()
+
 	j.hash = h
-}
-
-func (j *baseJob) done(child *baseJob) int {
-	if j.typ == jobTypeNormal {
-		return 0
-	}
-
-	j.lock.Lock()
-	defer j.lock.Unlock()
-
-	delete(j.children, child)
-	return len(j.children)
+	j.copyer.submit(&EventUpdateJob{j.report()})
 }
 
 func (j *baseJob) succes(path string) {
 	j.lock.Lock()
 	defer j.lock.Unlock()
+
 	j.successTargets = append(j.successTargets, path)
+	j.copyer.submit(&EventUpdateJob{j.report()})
 }
 
 func (j *baseJob) fail(path string, err error) {
@@ -121,24 +102,17 @@ func (j *baseJob) fail(path string, err error) {
 		j.failedTargets = make(map[string]error, 1)
 	}
 	j.failedTargets[path] = err
+	j.copyer.submit(&EventUpdateJob{j.report()})
 }
 
-func (j *baseJob) report() *File {
-	j.lock.Lock()
-	defer j.lock.Unlock()
-
-	fails := make(map[string]string, len(j.failedTargets))
-	for n, e := range j.failedTargets {
-		fails[n] = e.Error()
-	}
-
-	return &File{
-		Source:       j.source.path(),
-		RelativePath: j.source.relativePath,
+func (j *baseJob) report() *Job {
+	return &Job{
+		Base: j.source.base,
+		Path: j.source.path,
 
 		Status:         statusMapping[j.status],
 		SuccessTargets: j.successTargets,
-		FailTargets:    fails,
+		FailTargets:    j.failedTargets,
 
 		Size:      j.size,
 		Mode:      j.mode,
@@ -151,4 +125,25 @@ func (j *baseJob) report() *File {
 type writeJob struct {
 	*baseJob
 	src *mmap.ReaderAt
+	ch  chan struct{}
+}
+
+func (wj *writeJob) done() {
+	wj.src.Close()
+	close(wj.ch)
+}
+
+type Job struct {
+	Base string   `json:"base"`
+	Path []string `json:"path"`
+
+	Status         string           `json:"status"`
+	SuccessTargets []string         `json:"success_target,omitempty"`
+	FailTargets    map[string]error `json:"fail_target,omitempty"`
+
+	Size      int64       `json:"size"`
+	Mode      os.FileMode `json:"mode"`
+	ModTime   time.Time   `json:"mod_time"`
+	WriteTime time.Time   `json:"write_time"`
+	SHA256    string      `json:"sha256"`
 }
diff --git a/opt.go b/opt.go
index cb1fa61..6eeae5d 100644
--- a/opt.go
+++ b/opt.go
@@ -4,22 +4,31 @@ import (
 	"fmt"
 	"os"
 	"path"
+	"sort"
 	"strings"
 
 	"github.com/sirupsen/logrus"
 )
 
 type source struct {
-	base         string
-	relativePath string
+	base string
+	path []string
 }
 
-func (s *source) path() string {
-	return s.base + s.relativePath
+func (s *source) src() string {
+	return s.base + path.Join(s.path...)
 }
 
-func (s *source) target(dst string) string {
-	return dst + s.relativePath
+func (s *source) dst(dst string) string {
+	return dst + path.Join(s.path...)
+}
+
+func (s *source) append(next ...string) *source {
+	copyed := make([]string, len(s.path)+len(next))
+	copy(copyed, s.path)
+	copy(copyed[len(s.path):], next)
+
+	return &source{base: s.base, path: copyed}
 }
 
 type option struct {
@@ -29,21 +38,18 @@ type option struct {
 	fromDevice *deviceOption
 	toDevice   *deviceOption
 
-	overwrite       bool
-	withProgressBar bool
-	threads         int
-	withHash        bool
+	createFlag int
+	withHash   bool
 
-	autoFill           bool
-	autoFillSplitDepth int
-
-	logger *logrus.Logger
+	logger       *logrus.Logger
+	eventHanders []EventHandler
 }
 
 func newOption() *option {
 	return &option{
 		fromDevice: new(deviceOption),
 		toDevice:   new(deviceOption),
+		createFlag: os.O_WRONLY | os.O_CREATE | os.O_EXCL,
 	}
 }
 
@@ -73,17 +79,20 @@ func (o *option) check() error {
 	if len(o.src) == 0 {
 		return fmt.Errorf("source path not found")
 	}
+	sort.Slice(o.src, func(i, j int) bool {
+		return comparePath(o.src[i].path, o.src[j].path) < 0
+	})
 	for _, s := range o.src {
-		if _, err := os.Stat(s.path()); err != nil {
-			return fmt.Errorf("check src path '%s', %w", s.path(), err)
+		src := s.src()
+		if _, err := os.Stat(src); err != nil {
+			return fmt.Errorf("check src path '%s', %w", src, err)
 		}
 	}
 
-	if o.threads < 1 {
-		o.threads = 4
-	}
-	if o.fromDevice.linear || o.toDevice.linear {
-		o.threads = 1
+	o.fromDevice.check()
+	o.toDevice.check()
+	if o.logger == nil {
+		o.logger = logrus.StandardLogger()
 	}
 	return nil
 }
@@ -99,23 +108,17 @@ func Source(paths ...string) Option {
 			}
 
 			base, name := path.Split(p)
-			o.src = append(o.src, &source{base: base, relativePath: name})
+			o.src = append(o.src, &source{base: base, path: []string{name}})
 		}
 		return o
 	}
 }
 
-func AccurateSource(base string, relativePaths ...string) Option {
+func AccurateSource(base string, paths ...[]string) Option {
 	return func(o *option) *option {
 		base = path.Clean(base)
-
-		for _, p := range relativePaths {
-			p = path.Clean(p)
-			if p[len(p)-1] == '/' {
-				p = p[:len(p)-1]
-			}
-
-			o.src = append(o.src, &source{base: base, relativePath: p})
+		for _, path := range paths {
+			o.src = append(o.src, &source{base: base, path: path})
 		}
 		return o
 	}
@@ -154,23 +157,18 @@ func SetToDevice(opts ...DeviceOption) Option {
 
 func Overwrite(b bool) Option {
 	return func(o *option) *option {
-		o.overwrite = b
+		if b {
+			o.createFlag = os.O_WRONLY | os.O_CREATE | os.O_TRUNC
+			return o
+		}
+
+		o.createFlag = os.O_WRONLY | os.O_CREATE | os.O_EXCL
 		return o
 	}
 }
 
-func WithProgressBar(b bool) Option {
-	return func(o *option) *option {
-		o.withProgressBar = b
-		return o
-	}
-}
-
-func WithThreads(threads int) Option {
-	return func(o *option) *option {
-		o.threads = threads
-		return o
-	}
+func WithProgressBar() Option {
+	return WithEventHandler(NewProgressBar())
 }
 
 func WithHash(b bool) Option {
@@ -180,17 +178,61 @@ func WithHash(b bool) Option {
 	}
 }
 
-func WithAutoFill(on bool, depth int) Option {
-	return func(o *option) *option {
-		o.autoFill = on
-		o.autoFillSplitDepth = depth
-		return o
-	}
-}
-
 func WithLogger(logger *logrus.Logger) Option {
 	return func(o *option) *option {
 		o.logger = logger
 		return o
 	}
 }
+
+func WithEventHandler(h EventHandler) Option {
+	return func(o *option) *option {
+		o.eventHanders = append(o.eventHanders, h)
+		return o
+	}
+}
+
+func comparePath(a, b []string) int {
+	al, bl := len(a), len(b)
+
+	l := al
+	if bl < al {
+		l = bl
+	}
+
+	for idx := 0; idx < l; idx++ {
+		if a[idx] < b[idx] {
+			return -1
+		}
+		if a[idx] > b[idx] {
+			return 1
+		}
+	}
+
+	if al < bl {
+		return -1
+	}
+	if al > bl {
+		return 1
+	}
+	return 0
+}
+
+// isChild return -1(not) 0(equal) 1(child)
+func isChild(parent, child []string) int {
+	pl, cl := len(parent), len(child)
+	if pl > cl {
+		return -1
+	}
+
+	for idx := 0; idx < pl; idx++ {
+		if parent[idx] != child[idx] {
+			return -1
+		}
+	}
+
+	if pl == cl {
+		return 0
+	}
+	return 1
+}
diff --git a/opt_device.go b/opt_device.go
index 8ab75c8..8903170 100644
--- a/opt_device.go
+++ b/opt_device.go
@@ -1,7 +1,17 @@
 package acp
 
 type deviceOption struct {
-	linear bool
+	linear  bool
+	threads int
+}
+
+func (do *deviceOption) check() {
+	if do.threads == 0 {
+		do.threads = 8
+	}
+	if do.linear {
+		do.threads = 1
+	}
 }
 
 type DeviceOption func(*deviceOption) *deviceOption
@@ -12,3 +22,10 @@ func LinearDevice(b bool) DeviceOption {
 		return d
 	}
 }
+
+func DeviceThreads(threads int) DeviceOption {
+	return func(d *deviceOption) *deviceOption {
+		d.threads = threads
+		return d
+	}
+}
diff --git a/prepare.go b/prepare.go
new file mode 100644
index 0000000..b4f891d
--- /dev/null
+++ b/prepare.go
@@ -0,0 +1,57 @@
+package acp
+
+import (
+	"context"
+	"fmt"
+	"sync"
+
+	"github.com/abc950309/acp/mmap"
+)
+
+func (c *Copyer) prepare(ctx context.Context, indexed <-chan *baseJob) <-chan *writeJob {
+	chanLen := 32
+	if c.fromDevice.linear {
+		chanLen = 0
+	}
+
+	var wg sync.WaitGroup
+	ch := make(chan *writeJob, chanLen)
+	defer func() {
+		go wrap(ctx, func() {
+			defer close(ch)
+			wg.Wait()
+		})
+	}()
+
+	for idx := 0; idx < c.fromDevice.threads; idx++ {
+		wg.Add(1)
+		go wrap(ctx, func() {
+			defer wg.Done()
+
+			for {
+				select {
+				case <-ctx.Done():
+					return
+				case job, ok := <-indexed:
+					if !ok {
+						return
+					}
+
+					job.setStatus(jobStatusPreparing)
+
+					file, err := mmap.Open(job.source.src())
+					if err != nil {
+						c.reportError(job.source.src(), "", fmt.Errorf("open src file fail, %w", err))
+						return
+					}
+
+					wj := &writeJob{baseJob: job, src: file, ch: make(chan struct{})}
+					ch <- wj
+					<-wj.ch
+				}
+			}
+		})
+	}
+
+	return ch
+}
diff --git a/progress_bar.go b/progress_bar.go
index 7089273..121e3d6 100644
--- a/progress_bar.go
+++ b/progress_bar.go
@@ -1,25 +1,16 @@
 package acp
 
 import (
-	"context"
 	"fmt"
 	"os"
-	"sort"
-	"strings"
-	"sync/atomic"
 	"time"
 
 	"github.com/schollz/progressbar/v3"
-	"github.com/sirupsen/logrus"
 )
 
-const (
-	barUpdateInterval = time.Nanosecond * 255002861
-)
-
-func (c *Copyer) startProgressBar(ctx context.Context) {
+func NewProgressBar() EventHandler {
 	// progressBar := progressbar.DefaultBytes(1, "[0/0] indexing...")
-	progressBar := progressbar.NewOptions64(
+	bar := progressbar.NewOptions64(
 		1,
 		progressbar.OptionSetDescription("[0/0] indexing..."),
 		progressbar.OptionSetWriter(os.Stderr),
@@ -33,84 +24,26 @@ func (c *Copyer) startProgressBar(ctx context.Context) {
 		progressbar.OptionSetRenderBlankState(true),
 	)
 
-	ch := make(chan interface{}, 8)
-	c.updateProgressBar = func(f func(bar *progressbar.ProgressBar)) {
-		ch <- f
-	}
-	c.updateCopying = func(f func(set map[int64]struct{})) {
-		ch <- f
-	}
-	c.logf = func(l logrus.Level, format string, args ...any) {
-		ch <- func() { logrus.StandardLogger().Logf(l, format, args...) }
-	}
+	var totalFiles int64
+	return func(ev Event) {
+		switch e := ev.(type) {
+		case *EventUpdateCount:
+			totalFiles = e.Files
+			bar.Describe(fmt.Sprintf("[0/%d] indexing...", totalFiles))
+			bar.ChangeMax64(e.Bytes)
+			return
+		case *EventUpdateProgress:
+			bar.Set64(e.Bytes)
 
-	go wrap(ctx, func() {
-		copying := make(map[int64]struct{}, c.threads)
-
-		for f := range ch {
-			if progressBar == nil {
-				continue
-			}
-
-			switch v := f.(type) {
-			case func(bar *progressbar.ProgressBar):
-				v(progressBar)
-			case func(set map[int64]struct{}):
-				v(copying)
-
-				idxs := make([]int64, 0, len(copying))
-				for idx := range copying {
-					idxs = append(idxs, idx)
-				}
-				sort.Slice(idxs, func(i, j int) bool {
-					return idxs[i] < idxs[j]
-				})
-
-				strs := make([]string, 0, len(idxs))
-				for _, idx := range idxs {
-					strs = append(strs, fmt.Sprintf("file %d", idx))
-				}
-
-				copyedFiles, totalFiles := atomic.LoadInt64(&c.copyedFiles), atomic.LoadInt64(&c.totalFiles)
-				progressBar.Describe(fmt.Sprintf("[%d/%d] copying... %s", copyedFiles, totalFiles, strings.Join(strs, ", ")))
-			case func():
-				v()
-			}
-		}
-	})
-
-	go wrap(ctx, func() {
-		defer close(ch)
-
-		ticker := time.NewTicker(barUpdateInterval) // around 255ms, avoid conflict with progress bar fresh by second
-		defer ticker.Stop()
-
-		var lastCopyedBytes int64
-		for {
-			select {
-			case <-ticker.C:
-				switch atomic.LoadInt64(&c.stage) {
-				case StageCopy:
-					currentCopyedBytes := atomic.LoadInt64(&c.copyedBytes)
-					diff := currentCopyedBytes - lastCopyedBytes
-					lastCopyedBytes = currentCopyedBytes
-
-					c.updateProgressBar(func(bar *progressbar.ProgressBar) {
-						bar.Add64(diff)
-					})
-				}
-			case <-ctx.Done():
-				currentCopyedBytes := atomic.LoadInt64(&c.copyedBytes)
-				diff := int(currentCopyedBytes - lastCopyedBytes)
-				lastCopyedBytes = currentCopyedBytes
-
-				copyedFiles, totalFiles := atomic.LoadInt64(&c.copyedFiles), atomic.LoadInt64(&c.totalFiles)
-				c.updateProgressBar(func(bar *progressbar.ProgressBar) {
-					bar.Add(diff)
-					bar.Describe(fmt.Sprintf("[%d/%d] finished!", copyedFiles, totalFiles))
-				})
+			if !e.Finished {
+				bar.Describe(fmt.Sprintf("[%d/%d] copying...", e.Files, totalFiles))
 				return
 			}
+
+			bar.Describe(fmt.Sprintf("[%d/%d] finishing...", e.Files, totalFiles))
+			return
+		default:
+			return
 		}
-	})
+	}
 }
diff --git a/report.go b/report.go
index b4a1272..1953f6b 100644
--- a/report.go
+++ b/report.go
@@ -1,94 +1,54 @@
 package acp
 
 import (
-	"encoding/json"
-	"fmt"
-	"os"
-	"time"
+	"path"
+	"sync"
 )
 
-func (c *Copyer) Report() *Report {
-	jobs, nss := c.getJobsAndNoSpaceSource()
-	errs := c.getErrors()
+type ReportGetter func() *Report
 
-	files := make([]*File, 0, len(jobs))
-	for _, job := range jobs {
-		files = append(files, job.report())
+func NewReportGetter() (EventHandler, ReportGetter) {
+	var lock sync.Mutex
+	jobs := make(map[string]*Job, 8)
+	errors := make([]*Error, 0)
+
+	handler := func(ev Event) {
+		switch e := ev.(type) {
+		case *EventUpdateJob:
+			lock.Lock()
+			defer lock.Unlock()
+
+			key := path.Join(e.Job.Path...)
+			jobs[key] = e.Job
+		case *EventReportError:
+			lock.Lock()
+			defer lock.Unlock()
+
+			errors = append(errors, e.Error)
+		}
 	}
+	getter := func() *Report {
+		lock.Lock()
+		defer lock.Unlock()
 
-	noSpaceSources := make([]*FilePath, 0, len(nss))
-	for _, s := range nss {
-		if len(noSpaceSources) == 0 {
-			noSpaceSources = append(noSpaceSources, &FilePath{Base: s.base, RelativePaths: []string{s.relativePath}})
-			continue
+		jobsCopyed := make([]*Job, 0, len(jobs))
+		for _, j := range jobs {
+			jobsCopyed = append(jobsCopyed, j)
+		}
+		errorsCopyed := make([]*Error, 0, len(jobs))
+		for _, e := range errors {
+			errorsCopyed = append(errorsCopyed, e)
 		}
 
-		if last := noSpaceSources[len(noSpaceSources)-1]; last.Base == s.base {
-			last.RelativePaths = append(last.RelativePaths, s.relativePath)
-			continue
+		return &Report{
+			Jobs:   jobsCopyed,
+			Errors: errorsCopyed,
 		}
-
-		noSpaceSources = append(noSpaceSources, &FilePath{Base: s.base, RelativePaths: []string{s.relativePath}})
 	}
-
-	return &Report{
-		Files:          files,
-		NoSpaceSources: noSpaceSources,
-		Errors:         errs,
-	}
-}
-
-var (
-	_ = error(new(Error))
-	_ = json.Marshaler(new(Error))
-	_ = json.Unmarshaler(new(Error))
-)
-
-type Error struct {
-	Path string `json:"path,omitempty"`
-	Err  error  `json:"error,omitempty"`
-}
-
-func (e *Error) Error() string {
-	return fmt.Sprintf("[%s]: %s", e.Path, e.Err)
-}
-
-func (e *Error) MarshalJSON() ([]byte, error) {
-	return json.Marshal(map[string]string{"path": e.Path, "error": e.Err.Error()})
-}
-
-func (e *Error) UnmarshalJSON(buf []byte) error {
-	m := make(map[string]string, 2)
-	if err := json.Unmarshal(buf, &m); err != nil {
-		return err
-	}
-
-	e.Path, e.Err = m["path"], fmt.Errorf(m["error"])
-	return nil
-}
-
-type File struct {
-	Source       string `json:"source"`
-	RelativePath string `json:"relative_path"`
-
-	Status         string            `json:"status"`
-	SuccessTargets []string          `json:"success_target,omitempty"`
-	FailTargets    map[string]string `json:"fail_target,omitempty"`
-
-	Size      int64       `json:"size"`
-	Mode      os.FileMode `json:"mode"`
-	ModTime   time.Time   `json:"mod_time"`
-	WriteTime time.Time   `json:"write_time"`
-	SHA256    string      `json:"sha256"`
-}
-
-type FilePath struct {
-	Base          string   `json:"base,omitempty"`
-	RelativePaths []string `json:"relative_paths,omitempty"`
+	return handler, getter
 }
 
 type Report struct {
-	Files          []*File     `json:"files,omitempty"`
-	NoSpaceSources []*FilePath `json:"no_space_sources,omitempty"`
-	Errors         []*Error    `json:"errors,omitempty"`
+	Jobs   []*Job   `json:"files,omitempty"`
+	Errors []*Error `json:"errors,omitempty"`
 }
diff --git a/status.go b/status.go.bak
similarity index 100%
rename from status.go
rename to status.go.bak