qemu: hotplug: Merge virtio and non-virtio disk unplug code

The functions do basically exactly the same thing modulo few checks.
In case of virtio disks we check that the device is not multifunction as
that can't be unplugged at once. In case of USB and SCSI disks we
checked that no active block job is running.

The check for running blockjobs should have also been done for virtio
disks. By moving the multifunction check into the common function we fix
this case and also simplify the code.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_hotplug.c

@@ -5276,43 +5276,6 @@ qemuDomainSignalDeviceRemoval(virDomainObjPtr vm,
 }
 
 
-static int
-qemuDomainDetachVirtioDiskDevice(virQEMUDriverPtr driver,
-                                 virDomainObjPtr vm,
-                                 virDomainDiskDefPtr detach,
-                                 bool async)
-{
-    int ret = -1;
-
-    if (qemuIsMultiFunctionDevice(vm->def, &detach->info)) {
-        virReportError(VIR_ERR_OPERATION_FAILED,
-                       _("cannot hot unplug multifunction PCI device: %s"),
-                       detach->dst);
-        goto cleanup;
-    }
-
-    if (!async)
-        qemuDomainMarkDeviceForRemoval(vm, &detach->info);
-
-    if (qemuDomainDeleteDevice(vm, detach->info.alias) < 0) {
-        if (virDomainObjIsActive(vm))
-            virDomainAuditDisk(vm, detach->src, NULL, "detach", false);
-        goto cleanup;
-    }
-
-    if (async) {
-        ret = 0;
-    } else {
-        if ((ret = qemuDomainWaitForDeviceRemoval(vm)) == 1)
-            ret = qemuDomainRemoveDiskDevice(driver, vm, detach);
-    }
-
- cleanup:
-    if (!async)
-        qemuDomainResetDeviceRemoval(vm);
-    return ret;
-}
-
 static int
 qemuDomainDetachDiskDevice(virQEMUDriverPtr driver,
                            virDomainObjPtr vm,
@@ -5322,7 +5285,15 @@ qemuDomainDetachDiskDevice(virQEMUDriverPtr driver,
     int ret = -1;
 
     if (qemuDomainDiskBlockJobIsActive(detach))
-        goto cleanup;
+        return -1;
+
+    if (detach->bus == VIR_DOMAIN_DISK_BUS_VIRTIO &&
+        qemuIsMultiFunctionDevice(vm->def, &detach->info)) {
+        virReportError(VIR_ERR_OPERATION_FAILED,
+                       _("cannot hot unplug multifunction PCI device: %s"),
+                       detach->dst);
+        return -1;
+    }
 
     if (!async)
         qemuDomainMarkDeviceForRemoval(vm, &detach->info);
@@ -5381,8 +5352,6 @@ qemuDomainDetachDeviceDiskLive(virQEMUDriverPtr driver,
 
         switch ((virDomainDiskBus) disk->bus) {
         case VIR_DOMAIN_DISK_BUS_VIRTIO:
-            return qemuDomainDetachVirtioDiskDevice(driver, vm, disk, async);
-
         case VIR_DOMAIN_DISK_BUS_USB:
         case VIR_DOMAIN_DISK_BUS_SCSI:
             return qemuDomainDetachDiskDevice(driver, vm, disk, async);