qemuDomainCreateNamespace: move mkdir to qemuDomainBuildNamespace

Again, there is no need to create /var/lib/libvirt/$domain.*
directories in CreateNamespace(). It is sufficient to create them
as soon as we need them which is in BuildNamespace. This way we
don't leave them around for the whole lifetime of domain.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_domain.c

@@ -7369,6 +7369,13 @@ qemuDomainBuildNamespace(virQEMUDriverPtr driver,
         if (devMountsSavePath[i] == devPath)
             continue;
 
+        if (virFileMakePath(devMountsSavePath[i]) < 0) {
+            virReportSystemError(errno,
+                                 _("Failed to create %s"),
+                                 devMountsSavePath[i]);
+            goto cleanup;
+        }
+
         if (mount(devMountsPath[i], devMountsSavePath[i],
                   NULL, mount_flags, NULL) < 0) {
             virReportSystemError(errno,
@@ -7426,6 +7433,8 @@ qemuDomainBuildNamespace(virQEMUDriverPtr driver,
     ret = 0;
  cleanup:
     virObjectUnref(cfg);
+    for (i = 0; i < ndevMountsPath; i++)
+        rmdir(devMountsSavePath[i]);
     virStringListFreeCount(devMountsPath, ndevMountsPath);
     virStringListFreeCount(devMountsSavePath, ndevMountsPath);
     return ret;
@@ -7438,8 +7447,6 @@ qemuDomainCreateNamespace(virQEMUDriverPtr driver,
 {
     virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
     int ret = -1;
-    char **devMountsSavePath = NULL;
-    size_t ndevMountsSavePath = 0, i;
 
     if (!virBitmapIsBitSet(cfg->namespaces, QEMU_DOMAIN_NS_MOUNT) ||
         !virQEMUDriverIsPrivileged(driver)) {
@@ -7447,30 +7454,11 @@ qemuDomainCreateNamespace(virQEMUDriverPtr driver,
         goto cleanup;
     }
 
-    if (qemuDomainGetPreservedMounts(driver, vm,
-                                     NULL, &devMountsSavePath,
-                                     &ndevMountsSavePath) < 0)
-        goto cleanup;
-
-    for (i = 0; i < ndevMountsSavePath; i++) {
-        if (virFileMakePath(devMountsSavePath[i]) < 0) {
-            virReportSystemError(errno,
-                                 _("Failed to create %s"),
-                                 devMountsSavePath[i]);
-            goto cleanup;
-        }
-    }
-
     if (qemuDomainEnableNamespace(vm, QEMU_DOMAIN_NS_MOUNT) < 0)
         goto cleanup;
 
     ret = 0;
  cleanup:
-    if (ret < 0) {
-        for (i = 0; i < ndevMountsSavePath; i++)
-            rmdir(devMountsSavePath[i]);
-    }
-    virStringListFreeCount(devMountsSavePath, ndevMountsSavePath);
     virObjectUnref(cfg);
     return ret;
 }