[libvirt] [PATCH v2 2/2] lxc: Rearrange order in lxcDomainUpdateDeviceFlags

[John Ferlan]

Although commit e3497f3f noted that the LIVE option doesn't
matter and removed the call to virDomainDefCompatibleDevice,
it didn't go quite far enough and change the order of the checks
and rework the code to just handle the config change causing
a failure after virDomainObjUpdateModificationImpact updates
the @flags. Since we only support config a lot of previously
conditional code is now just inlined.

Signed-off-by: John Ferlan <jferlan at redhat.com>
---
 src/lxc/lxc_driver.c | 63 ++++++++++++++++++----------------------------------
 1 file changed, 21 insertions(+), 42 deletions(-)

diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index aea48e5e3d..72c6daa507 100644
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -4827,7 +4827,7 @@ static int lxcDomainUpdateDeviceFlags(virDomainPtr dom,
     virCapsPtr caps = NULL;
     virDomainObjPtr vm = NULL;
     virDomainDefPtr vmdef = NULL;
-    virDomainDeviceDefPtr dev = NULL, dev_copy = NULL;
+    virDomainDeviceDefPtr dev = NULL;
     int ret = -1;
     virLXCDriverConfigPtr cfg = virLXCDriverGetConfig(driver);
 
@@ -4846,61 +4846,40 @@ static int lxcDomainUpdateDeviceFlags(virDomainPtr dom,
     if (virDomainObjUpdateModificationImpact(vm, &flags) < 0)
         goto endjob;
 
-    if (!(caps = virLXCDriverGetCapabilities(driver, false)))
-        goto endjob;
-
-    dev = dev_copy = virDomainDeviceDefParse(xml, vm->def,
-                                             caps, driver->xmlopt,
-                                             VIR_DOMAIN_DEF_PARSE_INACTIVE);
-    if (dev == NULL)
+    if (flags & VIR_DOMAIN_AFFECT_LIVE) {
+        virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
+                       _("Unable to modify live devices"));
         goto endjob;
-
-    if (flags & VIR_DOMAIN_AFFECT_CONFIG &&
-        flags & VIR_DOMAIN_AFFECT_LIVE) {
-        /* If we are affecting both CONFIG and LIVE
-         * create a deep copy of device as adding
-         * to CONFIG takes one instance.
-         */
-        dev_copy = virDomainDeviceDefCopy(dev, vm->def,
-                                          caps, driver->xmlopt);
-        if (!dev_copy)
-            goto endjob;
     }
 
-    if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
-        /* Make a copy for updated domain. */
-        vmdef = virDomainObjCopyPersistentDef(vm, caps, driver->xmlopt);
-        if (!vmdef)
-            goto endjob;
+    if (!(caps = virLXCDriverGetCapabilities(driver, false)))
+        goto endjob;
 
-        /* virDomainDefCompatibleDevice call is delayed until we know the
-         * device we're going to update. */
-        if ((ret = lxcDomainUpdateDeviceConfig(vmdef, dev)) < 0)
-            goto endjob;
-    }
+    if (!(dev = virDomainDeviceDefParse(xml, vm->def, caps, driver->xmlopt,
+                                        VIR_DOMAIN_DEF_PARSE_INACTIVE)))
+        goto endjob;
 
-    if (flags & VIR_DOMAIN_AFFECT_LIVE) {
-        virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
-                       _("Unable to modify live devices"));
+    /* Make a copy for updated domain. */
+    vmdef = virDomainObjCopyPersistentDef(vm, caps, driver->xmlopt);
+    if (!vmdef)
+        goto endjob;
 
+    /* virDomainDefCompatibleDevice call is delayed until we know the
+     * device we're going to update. */
+    if ((ret = lxcDomainUpdateDeviceConfig(vmdef, dev)) < 0)
         goto endjob;
-    }
 
-    /* Finally, if no error until here, we can save config. */
-    if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
-        ret = virDomainSaveConfig(cfg->configDir, driver->caps, vmdef);
-        if (!ret) {
-            virDomainObjAssignDef(vm, vmdef, false, NULL);
-            vmdef = NULL;
-        }
+    ret = virDomainSaveConfig(cfg->configDir, driver->caps, vmdef);
+    if (!ret) {
+        virDomainObjAssignDef(vm, vmdef, false, NULL);
+        vmdef = NULL;
     }
+
  endjob:
     virLXCDomainObjEndJob(driver, vm);
 
  cleanup:
     virDomainDefFree(vmdef);
-    if (dev != dev_copy)
-        virDomainDeviceDefFree(dev_copy);
     virDomainDeviceDefFree(dev);
     virDomainObjEndAPI(&vm);
     virObjectUnref(caps);
-- 
2.14.4