1 files changed, 50 insertions, 0 deletions
diff --git a/weed/storage/volume_tier.go b/weed/storage/volume_tier.go
new file mode 100644
index 000000000..fd7b08654
--- /dev/null
+++ b/weed/storage/volume_tier.go
@@ -0,0 +1,50 @@
+package storage
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage/backend"
+	_ "github.com/chrislusf/seaweedfs/weed/storage/backend/s3_backend"
+)
+
+func (v *Volume) GetVolumeInfo() *volume_server_pb.VolumeInfo {
+	return v.volumeInfo
+}
+
+func (v *Volume) maybeLoadVolumeInfo() (found bool) {
+
+	v.volumeInfo, v.hasRemoteFile, _ = pb.MaybeLoadVolumeInfo(v.FileName() + ".vif")
+
+	if v.hasRemoteFile {
+		glog.V(0).Infof("volume %d is tiered to %s as %s and read only", v.Id,
+			v.volumeInfo.Files[0].BackendName(), v.volumeInfo.Files[0].Key)
+	}
+
+	return
+
+}
+
+func (v *Volume) HasRemoteFile() bool {
+	return v.hasRemoteFile
+}
+
+func (v *Volume) LoadRemoteFile() error {
+	tierFile := v.volumeInfo.GetFiles()[0]
+	backendStorage := backend.BackendStorages[tierFile.BackendName()]
+
+	if v.DataBackend != nil {
+		v.DataBackend.Close()
+	}
+
+	v.DataBackend = backendStorage.NewStorageFile(tierFile.Key, v.volumeInfo)
+	return nil
+}
+
+func (v *Volume) SaveVolumeInfo() error {
+
+	tierFileName := v.FileName() + ".vif"
+
+	return pb.SaveVolumeInfo(tierFileName, v.volumeInfo)
+
+}