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

[Eric Blake]

On 12/26/2017 07:35 AM, Jie Wang wrote:
> when the blockjob return status:"BLOCK_JOB_COMPLETED" with error:
> "File descriptor in bad state", "offset" and "len" are equal to zero,
> but the blockjob event should be "VIR_DOMAIN_BLOCK_JOB_FAILED"
> ---
>  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 e45868b..943360a 100644
> --- a/src/qemu/qemu_monitor_json.c
> +++ b/src/qemu/qemu_monitor_json.c
> @@ -886,7 +886,7 @@ 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 || offset == 0)

Unfortunately, offset can also be 0 on success if you perform a block
job on a zero-length disk (why anyone would use a 0-length disk in
practice is beyond me, but who knows).  Isn't a better patch to make our
decision based on whether 'error' is non-NULL?

>              event = VIR_DOMAIN_BLOCK_JOB_FAILED;
>          break;
>      case VIR_DOMAIN_BLOCK_JOB_CANCELED:
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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