<refactor>[kvm]: use enum for vm host file sync reasons

Replace hardcoded strings with VmHostFileSyncReason enum
for vm host file synchronization operations. Add new enum
values for snapshot group online backup, revert snapshot
and volume backup scenarios. Update KvmSecureBootExtensions
and VolumeSnapshotGroupBase to use enum values instead of
hardcoded strings.

Resolves: ZSV-11560
Related: ZSV-11310

Change-Id: I6f7867777a616777636c64666a6b646d6d6e7a70

Author: Zhang Wenhao

header/src/main/java/org/zstack/header/vm/additions/VmHostFileSyncReason.java

@@ -8,6 +8,9 @@ public enum VmHostFileSyncReason {
     VmShutdown("on libvirt shutdown event"),
     PostClone("on post-clone (from dest host)"),
     Restore("restore"),
+    SnapshotGroupOnlineBackup("snapshot group online backup"),
+    RevertSnapshot("revert snapshot"),
+    VolumeBackup("volume backup"),
     ;
 
     public final String detail;

plugin/kvm/src/main/java/org/zstack/kvm/efi/KvmSecureBootExtensions.java

@@ -85,6 +85,7 @@
 import static org.zstack.header.vm.additions.VmHostFileSyncReason.PrepareReRead;
 import static org.zstack.header.vm.additions.VmHostFileSyncReason.PrepareRead;
 import static org.zstack.header.vm.additions.VmHostFileSyncReason.ResourceRelease;
+import static org.zstack.header.vm.additions.VmHostFileSyncReason.SnapshotGroupOnlineBackup;
 import static org.zstack.kvm.KVMConstant.*;
 import static org.zstack.utils.CollectionDSL.list;
 
@@ -699,7 +700,7 @@ public void afterVolumeLiveSnapshotGroupCreatedOnBackend(CreateVolumesSnapshotOv
             }
         }
 
-        syncMsg.setSyncReason("snapshot-group-online-backup");
+        syncMsg.setSyncReason(SnapshotGroupOnlineBackup.reason());
         syncMsg.setSyncToBackup(true);
         syncMsg.setBackupResourceUuid(tempResourceUuid);
         bus.makeLocalServiceId(syncMsg, VmInstanceConstant.SECURE_BOOT_SERVICE_ID);

storage/src/main/java/org/zstack/storage/snapshot/group/VolumeSnapshotGroupBase.java

@@ -34,6 +34,7 @@
 import org.zstack.header.vm.VmInstanceConstant;
 import org.zstack.header.vm.additions.VmHostBackupFileVO;
 import org.zstack.header.vm.additions.VmHostBackupFileVO_;
+import org.zstack.header.vm.additions.VmHostFileSyncReason;
 import org.zstack.header.vm.devices.VmInstanceResourceMetadataManager;
 import org.zstack.header.volume.VolumeType;
 import org.zstack.header.volume.VolumeVO;
@@ -405,7 +406,7 @@ class Context {
                     RestoreVmHostFileMsg restoreMsg = new RestoreVmHostFileMsg();
                     restoreMsg.setVmInstanceUuid(vmUuid);
                     restoreMsg.setSnapshotGroupUuid(self.getUuid());
-                    restoreMsg.setSyncReason("revert snapshot");
+                    restoreMsg.setSyncReason(VmHostFileSyncReason.RevertSnapshot.reason());
                     bus.makeLocalServiceId(restoreMsg, VmInstanceConstant.SECURE_BOOT_SERVICE_ID);
                     bus.send(restoreMsg, new CloudBusCallBack(trigger) {
                         @Override