mount: avoid "send on closed channel"

weed/filesys/dirty_page.go

@@ -14,6 +14,7 @@ type ContinuousDirtyPages struct {
 	f                      *File
 	writeWaitGroup         sync.WaitGroup
 	chunkSaveErrChan       chan error
+	chunkSaveErrChanClosed bool
 	lock                   sync.Mutex
 	collection             string
 	replication            string
@@ -82,6 +83,11 @@ func (pages *ContinuousDirtyPages) saveExistingLargestPageToStorage() (hasSavedD
 
 func (pages *ContinuousDirtyPages) saveToStorage(reader io.Reader, offset int64, size int64) {
 
+	if pages.chunkSaveErrChanClosed {
+		pages.chunkSaveErrChan = make(chan error, 8)
+		pages.chunkSaveErrChanClosed = false
+	}
+
 	mtime := time.Now().UnixNano()
 	pages.writeWaitGroup.Add(1)
 	go func() {

weed/filesys/filehandle.go

@@ -186,6 +186,7 @@ func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) err
 	}
 
 	// stop the goroutine
+	fh.dirtyPages.chunkSaveErrChanClosed = true
 	close(fh.dirtyPages.chunkSaveErrChan)
 
 	return nil