added back anchor and selfheal broken chunks

pkg/fs/metadata.go

@@ -381,6 +381,7 @@ func (md *Metadata) close() (err error) {
 	md.cancel()
 	if md.wc != nil {
 		close(md.wc)
+		<-md.done
 		md.wc = nil
 	}
 	if md.f != nil {
@@ -449,30 +450,27 @@ type writeAt struct {
 
 func (md *Metadata) resetChans() {
 	md.wc = make(chan writeAt, 10)
+	md.done = make(chan struct{})
 }
 
 func (md *Metadata) writer() {
 	md.resetChans()
 	md.err.Store(nil)
 	go func() {
-		for {
-			select {
-			case <-md.ctx.Done():
-				return
-			case wa := <-md.wc:
-				atomic.StoreInt64(&md.Atime, now())
-				n, err := md.f.WriteAt(wa.data, wa.pos)
-				if err == nil {
-					md.addChunk(wa.pos, n)
-					md.fs.q.Add(n)
-				} else {
-					md.err.Store(&mdErr{err})
-				}
-				if wa.ret != nil {
-					streamingPool.Put(wa.ret)
-				}
+		for wa := range md.wc {
+			atomic.StoreInt64(&md.Atime, now())
+			n, err := md.f.WriteAt(wa.data, wa.pos)
+			if err == nil {
+				md.addChunk(wa.pos, n)
+				md.fs.q.Add(n)
+			} else {
+				md.err.Store(&mdErr{err})
+			}
+			if wa.ret != nil {
+				streamingPool.Put(wa.ret)
 			}
 		}
+		close(md.done)
 	}()
 }