[PATCH 17/19] qemu: migration: Clean up temporary bitmaps when cancelling a migration

[Peter Krempa]

In case when the block migration job required temporary bitmaps for
merging the appropriate checkpoints we need to clean them up when
cancelling the job. On success we don't need to do that though as the
bitmaps are just temporary thus are not written to disk.

Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
 src/qemu/qemu_migration.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 37f0d43d24..36424f8493 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -834,6 +834,32 @@ qemuMigrationSrcNBDCopyCancel(virQEMUDriverPtr driver,
 }


+static int
+qemuMigrationSrcCancelRemoveTempBitmaps(virDomainObjPtr vm,
+                                        qemuDomainAsyncJob asyncJob)
+{
+    qemuDomainObjPrivatePtr priv = vm->privateData;
+    virQEMUDriverPtr driver = priv->driver;
+    qemuDomainJobPrivatePtr jobPriv = priv->job.privateData;
+    GSList *next;
+
+    if (!jobPriv->migTempBitmaps)
+        return 0;
+
+    for (next = jobPriv->migTempBitmaps; next; next = next->next) {
+        qemuDomainJobPrivateMigrateTempBitmapPtr t = next->data;
+
+        if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
+            return -1;
+        qemuMonitorBitmapRemove(priv->mon, t->nodename, t->bitmapname);
+        if (qemuDomainObjExitMonitor(driver, vm) < 0)
+            return -1;
+    }
+
+    return 0;
+}
+
+
 static virStorageSourcePtr
 qemuMigrationSrcNBDStorageCopyBlockdevPrepareSource(virDomainDiskDefPtr disk,
                                                     const char *host,
@@ -3999,6 +4025,8 @@ qemuMigrationSrcRun(virQEMUDriverPtr driver,
                                           QEMU_ASYNC_JOB_MIGRATION_OUT,
                                           dconn);

+        qemuMigrationSrcCancelRemoveTempBitmaps(vm, QEMU_ASYNC_JOB_MIGRATION_OUT);
+
         if (priv->job.current->status != QEMU_DOMAIN_JOB_STATUS_CANCELED)
             priv->job.current->status = QEMU_DOMAIN_JOB_STATUS_FAILED;
     }
@@ -5701,6 +5729,9 @@ qemuMigrationSrcCancel(virQEMUDriverPtr driver,
                                       QEMU_ASYNC_JOB_NONE, NULL) < 0)
         return -1;

+    if (qemuMigrationSrcCancelRemoveTempBitmaps(vm, QEMU_ASYNC_JOB_NONE) < 0)
+        return -1;
+
     return 0;
 }

-- 
2.29.2