qemu: Convert aborting of a domain job to a switch statement

Until now we only really aborted migration via qemuDomainAbortJob. This
will change with the upcoming addition of the backup job. Additionally
there were a bunch of if statements checking various aspects of the
current job.

To make it more obvious convert qemuDomainAbortJob to use a switch
statement and move the individual conditions to the appropriate job
type.

Every job type has now it's own case despite multiple job types just
plainly cancelling the job for clarity and future extension.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_driver.c

@@ -14036,36 +14036,59 @@ static int qemuDomainAbortJob(virDomainPtr dom)
 
     priv = vm->privateData;
 
-    if (!priv->job.asyncJob) {
-        virReportError(VIR_ERR_OPERATION_INVALID,
-                       "%s", _("no job is active on the domain"));
-        goto endjob;
-    }
+    switch (priv->job.asyncJob) {
+    case QEMU_ASYNC_JOB_NONE:
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("no job is active on the domain"));
+        break;
 
-    if (priv->job.asyncJob == QEMU_ASYNC_JOB_MIGRATION_IN) {
+    case QEMU_ASYNC_JOB_MIGRATION_IN:
         virReportError(VIR_ERR_OPERATION_INVALID, "%s",
                        _("cannot abort incoming migration;"
                          " use virDomainDestroy instead"));
-        goto endjob;
-    }
+        break;
 
-    if (priv->job.asyncJob == QEMU_ASYNC_JOB_DUMP &&
-        priv->job.apiFlags & VIR_DUMP_MEMORY_ONLY) {
+    case QEMU_ASYNC_JOB_START:
         virReportError(VIR_ERR_OPERATION_INVALID, "%s",
-                       _("cannot abort memory-only dump"));
-        goto endjob;
-    }
+                       _("cannot abort VM start;"
+                         " use virDomainDestroy instead"));
+        break;
 
-    if (priv->job.asyncJob == QEMU_ASYNC_JOB_MIGRATION_OUT &&
-        (priv->job.current->status == QEMU_DOMAIN_JOB_STATUS_POSTCOPY ||
-         (virDomainObjGetState(vm, &reason) == VIR_DOMAIN_PAUSED &&
-          reason == VIR_DOMAIN_PAUSED_POSTCOPY))) {
-        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
-                       _("cannot abort migration in post-copy mode"));
-        goto endjob;
-    }
+    case QEMU_ASYNC_JOB_MIGRATION_OUT:
+        if ((priv->job.current->status == QEMU_DOMAIN_JOB_STATUS_POSTCOPY ||
+             (virDomainObjGetState(vm, &reason) == VIR_DOMAIN_PAUSED &&
+              reason == VIR_DOMAIN_PAUSED_POSTCOPY))) {
+            virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                           _("cannot abort migration in post-copy mode"));
+            goto endjob;
+        }
 
-    ret = qemuDomainAbortJobMigration(vm);
+        ret = qemuDomainAbortJobMigration(vm);
+        break;
+
+    case QEMU_ASYNC_JOB_SAVE:
+        ret = qemuDomainAbortJobMigration(vm);
+        break;
+
+    case QEMU_ASYNC_JOB_DUMP:
+        if (priv->job.apiFlags & VIR_DUMP_MEMORY_ONLY) {
+            virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                           _("cannot abort memory-only dump"));
+            goto endjob;
+        }
+
+        ret = qemuDomainAbortJobMigration(vm);
+        break;
+
+    case QEMU_ASYNC_JOB_SNAPSHOT:
+        ret = qemuDomainAbortJobMigration(vm);
+        break;
+
+    case QEMU_ASYNC_JOB_LAST:
+    default:
+        virReportEnumRangeError(qemuDomainAsyncJob, priv->job.asyncJob);
+        break;
+    }
 
  endjob:
     qemuDomainObjEndJob(driver, vm);