[Xen-devel] [PATCH V3 2/3] libxl: acquire a job when destroying a domain

[Jim Fehlig <jfehlig@xxxxxxxx>]

A job should be acquired at the beginning of a domain destroy operation,
not at the end when cleaning up the domain.  Fix two occurrences of this
late job acquisition in the libxl driver.  Doing so renders
libxlDomainCleanupJob unused, so it is removed.

Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
---

Unchanged from V2.

 src/libxl/libxl_domain.c | 53 ++++++++++++++++--------------------------------
 src/libxl/libxl_domain.h |  4 ----
 src/libxl/libxl_driver.c | 20 ++++++++++--------
 3 files changed, 29 insertions(+), 48 deletions(-)

diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
index 391291d..37ed082 100644
--- a/src/libxl/libxl_domain.c
+++ b/src/libxl/libxl_domain.c
@@ -371,6 +371,9 @@ libxlDomainShutdownThread(void *opaque)
 
     cfg = libxlDriverConfigGet(driver);
 
+    if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0)
+        goto cleanup;
+
     if (xl_reason == LIBXL_SHUTDOWN_REASON_POWEROFF) {
         dom_event = virDomainEventLifecycleNewFromObj(vm,
                                            VIR_DOMAIN_EVENT_STOPPED,
@@ -384,7 +387,7 @@ libxlDomainShutdownThread(void *opaque)
             goto restart;
         case VIR_DOMAIN_LIFECYCLE_PRESERVE:
         case VIR_DOMAIN_LIFECYCLE_LAST:
-            goto cleanup;
+            goto endjob;
         }
     } else if (xl_reason == LIBXL_SHUTDOWN_REASON_CRASH) {
         dom_event = virDomainEventLifecycleNewFromObj(vm,
@@ -399,7 +402,7 @@ libxlDomainShutdownThread(void *opaque)
             goto restart;
         case VIR_DOMAIN_LIFECYCLE_CRASH_PRESERVE:
         case VIR_DOMAIN_LIFECYCLE_CRASH_LAST:
-            goto cleanup;
+            goto endjob;
         case VIR_DOMAIN_LIFECYCLE_CRASH_COREDUMP_DESTROY:
             libxlDomainAutoCoreDump(driver, vm);
             goto destroy;
@@ -420,11 +423,11 @@ libxlDomainShutdownThread(void *opaque)
             goto restart;
         case VIR_DOMAIN_LIFECYCLE_PRESERVE:
         case VIR_DOMAIN_LIFECYCLE_LAST:
-            goto cleanup;
+            goto endjob;
         }
     } else {
         VIR_INFO("Unhandled shutdown_reason %d", xl_reason);
-        goto cleanup;
+        goto endjob;
     }
 
  destroy:
@@ -433,13 +436,11 @@ libxlDomainShutdownThread(void *opaque)
         dom_event = NULL;
     }
     libxl_domain_destroy(cfg->ctx, vm->def->id, NULL);
-    if (libxlDomainCleanupJob(driver, vm, reason)) {
-        if (!vm->persistent) {
-            virDomainObjListRemove(driver->domains, vm);
-            vm = NULL;
-        }
-    }
-    goto cleanup;
+    libxlDomainCleanup(driver, vm, reason);
+    if (!vm->persistent)
+        virDomainObjListRemove(driver->domains, vm);
+
+    goto endjob;
 
  restart:
     if (dom_event) {
@@ -447,13 +448,17 @@ libxlDomainShutdownThread(void *opaque)
         dom_event = NULL;
     }
     libxl_domain_destroy(cfg->ctx, vm->def->id, NULL);
-    libxlDomainCleanupJob(driver, vm, VIR_DOMAIN_SHUTOFF_SHUTDOWN);
+    libxlDomainCleanup(driver, vm, VIR_DOMAIN_SHUTOFF_SHUTDOWN);
     if (libxlDomainStart(driver, vm, false, -1) < 0) {
         virErrorPtr err = virGetLastError();
         VIR_ERROR(_("Failed to restart VM '%s': %s"),
                   vm->def->name, err ? err->message : _("unknown error"));
     }
 
+ endjob:
+    if (!libxlDomainObjEndJob(driver, vm))
+        vm = NULL;
+
  cleanup:
     if (vm)
         virObjectUnlock(vm);
@@ -691,26 +696,6 @@ libxlDomainCleanup(libxlDriverPrivatePtr driver,
 }
 
 /*
- * Cleanup function for domain that has reached shutoff state.
- * Executed in the context of a job.
- *
- * virDomainObjPtr should be locked on invocation
- * Returns true if references remain on virDomainObjPtr, false otherwise.
- */
-bool
-libxlDomainCleanupJob(libxlDriverPrivatePtr driver,
-                      virDomainObjPtr vm,
-                      virDomainShutoffReason reason)
-{
-    if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_DESTROY) < 0)
-        return true;
-
-    libxlDomainCleanup(driver, vm, reason);
-
-    return libxlDomainObjEndJob(driver, vm);
-}
-
-/*
  * Core dump domain to default dump path.
  *
  * virDomainObjPtr must be locked on invocation
@@ -735,15 +720,11 @@ libxlDomainAutoCoreDump(libxlDriverPrivatePtr driver,
                     timestr) < 0)
         goto cleanup;
 
-    if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0)
-        goto cleanup;
-
     /* Unlock virDomainObj while dumping core */
     virObjectUnlock(vm);
     libxl_domain_core_dump(cfg->ctx, vm->def->id, dumpfile, NULL);
     virObjectLock(vm);
 
-    ignore_value(libxlDomainObjEndJob(driver, vm));
     ret = 0;
 
  cleanup:
diff --git a/src/libxl/libxl_domain.h b/src/libxl/libxl_domain.h
index a032e46..30855a2 100644
--- a/src/libxl/libxl_domain.h
+++ b/src/libxl/libxl_domain.h
@@ -108,10 +108,6 @@ libxlDomainCleanup(libxlDriverPrivatePtr driver,
                    virDomainObjPtr vm,
                    virDomainShutoffReason reason);
 
-bool
-libxlDomainCleanupJob(libxlDriverPrivatePtr driver,
-                      virDomainObjPtr vm,
-                      virDomainShutoffReason reason);
 /*
  * Note: Xen 4.3 removed the const from the event handler signature.
  * Detect which signature to use based on
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index e315b32..c9623ef 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -1240,10 +1240,13 @@ libxlDomainDestroyFlags(virDomainPtr dom,
     if (virDomainDestroyFlagsEnsureACL(dom->conn, vm->def) < 0)
         goto cleanup;
 
+    if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0)
+        goto cleanup;
+
     if (!virDomainObjIsActive(vm)) {
         virReportError(VIR_ERR_OPERATION_INVALID,
                        "%s", _("Domain is not running"));
-        goto cleanup;
+        goto endjob;
     }
 
     event = virDomainEventLifecycleNewFromObj(vm, VIR_DOMAIN_EVENT_STOPPED,
@@ -1252,18 +1255,19 @@ libxlDomainDestroyFlags(virDomainPtr dom,
     if (libxl_domain_destroy(cfg->ctx, vm->def->id, NULL) < 0) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Failed to destroy domain '%d'"), vm->def->id);
-        goto cleanup;
+        goto endjob;
     }
 
-    if (libxlDomainCleanupJob(driver, vm, VIR_DOMAIN_SHUTOFF_DESTROYED)) {
-        if (!vm->persistent) {
-            virDomainObjListRemove(driver->domains, vm);
-            vm = NULL;
-        }
-    }
+    libxlDomainCleanup(driver, vm, VIR_DOMAIN_SHUTOFF_DESTROYED);
+    if (!vm->persistent)
+        virDomainObjListRemove(driver->domains, vm);
 
     ret = 0;
 
+ endjob:
+    if (!libxlDomainObjEndJob(driver, vm))
+        vm = NULL;
+
  cleanup:
     if (vm)
         virObjectUnlock(vm);
-- 
1.8.4.5


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