close file in ScanVolumeFile()

fix https://github.com/chrislusf/seaweedfs/issues/761

weed/storage/volume.go

@@ -57,6 +57,13 @@ func (v *Volume) Version() Version {
 }
 
 func (v *Volume) Size() int64 {
+	v.dataFileAccessLock.Lock()
+	defer v.dataFileAccessLock.Unlock()
+
+	if v.dataFile == nil {
+		return 0
+	}
+
 	stat, e := v.dataFile.Stat()
 	if e == nil {
 		return stat.Size()
@@ -69,8 +76,14 @@ func (v *Volume) Size() int64 {
 func (v *Volume) Close() {
 	v.dataFileAccessLock.Lock()
 	defer v.dataFileAccessLock.Unlock()
-	v.nm.Close()
-	_ = v.dataFile.Close()
+	if v.nm != nil {
+		v.nm.Close()
+		v.nm = nil
+	}
+	if v.dataFile != nil {
+		_ = v.dataFile.Close()
+		v.dataFile = nil
+	}
 }
 
 func (v *Volume) NeedToReplicate() bool {

weed/storage/volume_read_write.go

@@ -193,6 +193,7 @@ func ScanVolumeFile(dirname string, collection string, id VolumeId,
 	if err = visitSuperBlock(v.SuperBlock); err != nil {
 		return fmt.Errorf("Failed to process volume %d super block: %v", id, err)
 	}
+	defer v.Close()
 
 	version := v.Version()
 

weed/storage/volume_vacuum.go

@@ -44,7 +44,10 @@ func (v *Volume) commitCompact() error {
 	defer v.dataFileAccessLock.Unlock()
 	glog.V(3).Infof("Got volume %d committing lock...", v.Id)
 	v.nm.Close()
-	_ = v.dataFile.Close()
+	if err := v.dataFile.Close(); err != nil {
+		glog.V(0).Infof("fail to close volume %d", v.Id)
+	}
+	v.dataFile = nil
 
 	var e error
 	if e = v.makeupDiff(v.FileName()+".cpd", v.FileName()+".cpx", v.FileName()+".dat", v.FileName()+".idx"); e != nil {
@@ -60,10 +63,10 @@ func (v *Volume) commitCompact() error {
 	} else {
 		var e error
 		if e = os.Rename(v.FileName()+".cpd", v.FileName()+".dat"); e != nil {
-			return e
+			return fmt.Errorf("rename %s: %v", v.FileName()+".cpd", e)
 		}
 		if e = os.Rename(v.FileName()+".cpx", v.FileName()+".idx"); e != nil {
-			return e
+			return fmt.Errorf("rename %s: %v", v.FileName()+".cpx", e)
 		}
 	}