qemu: prepare blockjob complete event error usage

This patch pass event error up to the place where we can
use it. Error is passed only for sync blockjob event mode
as we can't use the error in async mode. In async mode we
just pass the event details to the client thru event API
but current blockjob event API can not carry extra parameter.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_blockjob.c

@@ -35,6 +35,7 @@
 #include "virthread.h"
 #include "virtime.h"
 #include "locking/domain_lock.h"
+#include "viralloc.h"
 
 #define VIR_FROM_THIS VIR_FROM_QEMU
 
@@ -66,6 +67,7 @@ qemuBlockJobUpdate(virQEMUDriverPtr driver,
                                  diskPriv->blockJobType,
                                  diskPriv->blockJobStatus);
         diskPriv->blockJobStatus = -1;
+        VIR_FREE(diskPriv->blockJobError);
     }
 
     return status;

src/qemu/qemu_domain.c

@@ -892,6 +892,7 @@ qemuDomainSecretInfoFree(qemuDomainSecretInfoPtr *secinfo)
 
 
 static virClassPtr qemuDomainDiskPrivateClass;
+static void qemuDomainDiskPrivateDispose(void *obj);
 
 static int
 qemuDomainDiskPrivateOnceInit(void)
@@ -899,7 +900,7 @@ qemuDomainDiskPrivateOnceInit(void)
     qemuDomainDiskPrivateClass = virClassNew(virClassForObject(),
                                              "qemuDomainDiskPrivate",
                                              sizeof(qemuDomainDiskPrivate),
-                                             NULL);
+                                             qemuDomainDiskPrivateDispose);
     if (!qemuDomainDiskPrivateClass)
         return -1;
     else
@@ -922,6 +923,13 @@ qemuDomainDiskPrivateNew(void)
     return (virObjectPtr) priv;
 }
 
+static void
+qemuDomainDiskPrivateDispose(void *obj)
+{
+    qemuDomainDiskPrivatePtr priv = obj;
+
+    VIR_FREE(priv->blockJobError);
+}
 
 static virClassPtr qemuDomainStorageSourcePrivateClass;
 static void qemuDomainStorageSourcePrivateDispose(void *obj);

src/qemu/qemu_domain.h

@@ -350,6 +350,7 @@ struct _qemuDomainDiskPrivate {
     /* for some synchronous block jobs, we need to notify the owner */
     int blockJobType;   /* type of the block job from the event */
     int blockJobStatus; /* status of the finished block job */
+    char *blockJobError; /* block job completed event error */
     bool blockJobSync; /* the block job needs synchronized termination */
 
     bool migrating; /* the disk is being migrated */

src/qemu/qemu_monitor.c

@@ -1515,13 +1515,14 @@ int
 qemuMonitorEmitBlockJob(qemuMonitorPtr mon,
                         const char *diskAlias,
                         int type,
-                        int status)
+                        int status,
+                        const char *error)
 {
     int ret = -1;
     VIR_DEBUG("mon=%p", mon);
 
     QEMU_MONITOR_CALLBACK(mon, ret, domainBlockJob, mon->vm,
-                          diskAlias, type, status);
+                          diskAlias, type, status, error);
     return ret;
 }
 

src/qemu/qemu_monitor.h

@@ -176,6 +176,7 @@ typedef int (*qemuMonitorDomainBlockJobCallback)(qemuMonitorPtr mon,
                                                  const char *diskAlias,
                                                  int type,
                                                  int status,
+                                                 const char *error,
                                                  void *opaque);
 typedef int (*qemuMonitorDomainTrayChangeCallback)(qemuMonitorPtr mon,
                                                    virDomainObjPtr vm,
@@ -375,7 +376,8 @@ int qemuMonitorEmitPMSuspend(qemuMonitorPtr mon);
 int qemuMonitorEmitBlockJob(qemuMonitorPtr mon,
                             const char *diskAlias,
                             int type,
-                            int status);
+                            int status,
+                            const char *error);
 int qemuMonitorEmitBalloonChange(qemuMonitorPtr mon,
                                  unsigned long long actual);
 int qemuMonitorEmitPMSuspendDisk(qemuMonitorPtr mon);

src/qemu/qemu_monitor_json.c

@@ -851,6 +851,7 @@ qemuMonitorJSONHandleBlockJobImpl(qemuMonitorPtr mon,
 {
     const char *device;
     const char *type_str;
+    const char *error = NULL;
     int type = VIR_DOMAIN_BLOCK_JOB_TYPE_UNKNOWN;
     unsigned long long offset, len;
 
@@ -883,6 +884,7 @@ qemuMonitorJSONHandleBlockJobImpl(qemuMonitorPtr mon,
 
     switch ((virConnectDomainEventBlockJobStatus) event) {
     case VIR_DOMAIN_BLOCK_JOB_COMPLETED:
+        error = virJSONValueObjectGetString(data, "error");
         /* Make sure the whole device has been processed */
         if (offset != len)
             event = VIR_DOMAIN_BLOCK_JOB_FAILED;
@@ -897,7 +899,7 @@ qemuMonitorJSONHandleBlockJobImpl(qemuMonitorPtr mon,
     }
 
  out:
-    qemuMonitorEmitBlockJob(mon, device, type, event);
+    qemuMonitorEmitBlockJob(mon, device, type, event, error);
 }
 
 static void

src/qemu/qemu_process.c

@@ -1000,6 +1000,7 @@ qemuProcessHandleBlockJob(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
                           const char *diskAlias,
                           int type,
                           int status,
+                          const char *error,
                           void *opaque)
 {
     virQEMUDriverPtr driver = opaque;
@@ -1021,6 +1022,8 @@ qemuProcessHandleBlockJob(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
         /* We have a SYNC API waiting for this event, dispatch it back */
         diskPriv->blockJobType = type;
         diskPriv->blockJobStatus = status;
+        VIR_FREE(diskPriv->blockJobError);
+        ignore_value(VIR_STRDUP_QUIET(diskPriv->blockJobError, error));
         virDomainObjBroadcast(vm);
     } else {
         /* there is no waiting SYNC API, dispatch the update to a thread */