[libvirt] [PATCH 1/2] qemu: checkpoint: Extract and export rollback of checkpoint metadata storing

[Peter Krempa]

If we are certain that the checkpoint creation failed we remove the
metadata from the list. To allow reusing this in the backup code add a
new helper and export it.

Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
 src/qemu/qemu_checkpoint.c | 22 ++++++++++++++++++++--
 src/qemu/qemu_checkpoint.h |  4 ++++
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/src/qemu/qemu_checkpoint.c b/src/qemu/qemu_checkpoint.c
index 97bc97bb8e..2fa5c1ae00 100644
--- a/src/qemu/qemu_checkpoint.c
+++ b/src/qemu/qemu_checkpoint.c
@@ -400,6 +400,24 @@ qemuCheckpointCreateCommon(virQEMUDriverPtr driver,
 }


+/**
+ * qemuCheckpointRollbackMetadata:
+ * @vm: domain object
+ * @chk: checkpoint object
+ *
+ * If @chk is not null remove the @chk object from the list of checkpoints of @vm.
+ */
+void
+qemuCheckpointRollbackMetadata(virDomainObjPtr vm,
+                               virDomainMomentObjPtr chk)
+{
+    if (!chk)
+        return;
+
+    virDomainCheckpointObjListRemove(vm->checkpoints, chk);
+}
+
+
 static virDomainMomentObjPtr
 qemuCheckpointCreate(virQEMUDriverPtr driver,
                      virDomainObjPtr vm,
@@ -415,7 +433,7 @@ qemuCheckpointCreate(virQEMUDriverPtr driver,
     qemuDomainObjEnterMonitor(driver, vm);
     rc = qemuMonitorTransaction(qemuDomainGetMonitor(vm), &actions);
     if (qemuDomainObjExitMonitor(driver, vm) < 0 || rc < 0) {
-        virDomainCheckpointObjListRemove(vm->checkpoints, chk);
+        qemuCheckpointRollbackMetadata(vm, chk);
         return NULL;
     }

@@ -441,7 +459,7 @@ qemuCheckpointCreateFinalize(virQEMUDriverPtr driver,
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("unable to save metadata for checkpoint %s"),
                        chk->def->name);
-        virDomainCheckpointObjListRemove(vm->checkpoints, chk);
+        qemuCheckpointRollbackMetadata(vm, chk);
         return -1;
     }

diff --git a/src/qemu/qemu_checkpoint.h b/src/qemu/qemu_checkpoint.h
index 00548beec9..eb85611ea6 100644
--- a/src/qemu/qemu_checkpoint.h
+++ b/src/qemu/qemu_checkpoint.h
@@ -67,3 +67,7 @@ qemuCheckpointCreateFinalize(virQEMUDriverPtr driver,
                              virQEMUDriverConfigPtr cfg,
                              virDomainMomentObjPtr chk,
                              bool update_current);
+
+void
+qemuCheckpointRollbackMetadata(virDomainObjPtr vm,
+                               virDomainMomentObjPtr chk);
-- 
2.24.1