[libvirt] [PATCH 8/8] qemu: domain: Base block job interlocking on QEMU_CAPS_INCREMENTAL_BACKUP

[Peter Krempa]

The QEMU_CAPS_INCREMENTAL_BACKUP will be enabled once all bits of the
incremental backup feature work as expected which means also properly
interacting with blockjobs and snapshots.

Thus we can allow blockjobs and snapshots if QEMU_CAPS_INCREMENTAL_BACKUP
is present even when checkpoints exist.

Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
 src/qemu/qemu_domain.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index e8a82fee0b..6d42530db0 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -15526,7 +15526,10 @@ qemuDomainDefHasManagedPR(virDomainObjPtr vm)
 int
 qemuDomainSupportsCheckpointsBlockjobs(virDomainObjPtr vm)
 {
-    if (virDomainListCheckpoints(vm->checkpoints, NULL, NULL, NULL, 0) > 0) {
+    qemuDomainObjPrivatePtr priv = vm->privateData;
+
+    if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_INCREMENTAL_BACKUP) &&
+        virDomainListCheckpoints(vm->checkpoints, NULL, NULL, NULL, 0) > 0) {
         virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
                        _("cannot perform block operations while checkpoint exists"));
         return -1;
-- 
2.21.0