[PATCH 4/5] qemu: hotplug: Disallow media change while blockjob is active

[Peter Krempa <pkrempa@xxxxxxxxxx>]

Until the block job completes we can't change the disk chain. Removal
would fail as the block job still has reference to the chain.

Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
 src/qemu/qemu_hotplug.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 150da34b4a..34249bd030 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -852,10 +852,17 @@ qemuDomainChangeEjectableMedia(virQEMUDriverPtr driver,
     VIR_AUTOUNREF(virQEMUDriverConfigPtr) cfg = virQEMUDriverGetConfig(driver);
     qemuDomainObjPrivatePtr priv = vm->privateData;
     virStorageSourcePtr oldsrc = disk->src;
+    qemuDomainDiskPrivatePtr diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
     bool sharedAdded = false;
     int ret = -1;
     int rc;

+    if (diskPriv->blockjob && qemuBlockJobIsRunning(diskPriv->blockjob)) {
+        virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
+                       _("can't change media while a block job is running on the device"));
+        return -1;
+    }
+
     disk->src = newsrc;

     if (virDomainDiskTranslateSourcePool(disk) < 0)
-- 
2.20.1

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