add locking to access l.volumes

weed/storage/disk_location.go

@@ -6,8 +6,9 @@ import (
 	"strings"
 	"sync"
 
-	"github.com/chrislusf/seaweedfs/weed/glog"
 	"fmt"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
 )
 
 type DiskLocation struct {
@@ -32,7 +33,7 @@ func (l *DiskLocation) volumeIdFromPath(dir os.FileInfo) (VolumeId, string, erro
 		if i > 0 {
 			collection, base = base[0:i], base[i+1:]
 		}
-		vol, err := NewVolumeId(base);
+		vol, err := NewVolumeId(base)
 		return vol, collection, err
 	}
 
@@ -148,7 +149,10 @@ func (l *DiskLocation) LoadVolume(vid VolumeId, needleMapKind NeedleMapType) boo
 	return false
 }
 
-func (l *DiskLocation) DeleteVolume(vid VolumeId) (error) {
+func (l *DiskLocation) DeleteVolume(vid VolumeId) error {
+	l.Lock()
+	defer l.Unlock()
+
 	_, ok := l.volumes[vid]
 	if !ok {
 		return fmt.Errorf("Volume not found, VolumeId: %d", vid)
@@ -156,7 +160,10 @@ func (l *DiskLocation) DeleteVolume(vid VolumeId) (error) {
 	return l.deleteVolumeById(vid)
 }
 
-func (l *DiskLocation) UnloadVolume(vid VolumeId) (error) {
+func (l *DiskLocation) UnloadVolume(vid VolumeId) error {
+	l.Lock()
+	defer l.Unlock()
+
 	_, ok := l.volumes[vid]
 	if !ok {
 		return fmt.Errorf("Volume not loaded, VolumeId: %d", vid)