After blockcopy with pivot, a dirty-bitmap is added, but not been removed automatically.

[ChangLimin]

>On Mon, May 10, 2021 at 13:34:41 +0800, ChangLimin wrote:
>> Hi Peter,
>>
>> Since https://libvirt.org/git/?p=libvirt.git;a=commitdiff;h=7bfff40fdfe5410c446c1cd8ec413e00530faf7d,
>> after blockcopy with pivot, a dirty-bitmap is added, but not been removed automatically.
>> Is that something wrong?
>
>Yeah, it's a bug and it should be removed. I'll have a look.
> 

Can this patch fix the bug? 

diff --git a/src/qemu/qemu_blockjob.c b/src/qemu/qemu_blockjob.c
index faf9a9fb7d..15dabe2c23 100644
--- a/src/qemu/qemu_blockjob.c
+++ b/src/qemu/qemu_blockjob.c
@@ -1338,7 +1338,8 @@ qemuBlockJobProcessEventCompletedCopyBitmaps(virDomainObj *vm,
     g_autoptr(virJSONValue) actions = NULL;
     bool shallow = job->jobflags & VIR_DOMAIN_BLOCK_COPY_SHALLOW;

-    if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV_REOPEN))
+    if (job->disk->src->readonly &&
+        !virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV_REOPEN))
         return 0;