[libvirt] [PATCH V3] blockjob: Fix error checking of blockjob status

[Jie Wang]

offset and len can also be equal to 0 on failed if blockjob return
status:"BLOCK_JOB_COMPLETED" with error:"File descriptor in bad state",
so it's better to make our decision based on whether 'error' is non-NULL.
---
 src/qemu/qemu_monitor_json.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index e45868b..18b2ad6 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -885,8 +885,7 @@ 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)
+        if (offset != len || error)
             event = VIR_DOMAIN_BLOCK_JOB_FAILED;
         break;
     case VIR_DOMAIN_BLOCK_JOB_CANCELED:
-- 
1.8.3.1