[libvirt] [PATCH] blockjob: Fix a error checking of blockjob status in some case

[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", this bug can be reproduced easily if you perform a async
block job on read only filesystem, so it's very worthwhile for us to
check 'error' in this case.
---
 src/qemu/qemu_monitor_json.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 5ddd855..442b218 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -889,7 +889,7 @@ qemuMonitorJSONHandleBlockJobImpl(qemuMonitorPtr mon,
     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