Re: [Qemu-block] [Qemu-devel] [PATCH 2/2] iotests: fix 109

[Sascha Silbe]

Dear Vladimir,

Vladimir Sementsov-Ogievskiy <address@hidden> writes:

> 109 iotest is broken for raw after 0965a41e998ab820b5
> [mirror: double performance of the bulk stage if the disc is full]
>
> The problem is with finishing block-job with error: before specified
> patch mirror was not very async and it created one big request at disk
> start, this request finished with error and qemu produced
> BLOCK_JOB_COMPLETED with zero progress.
>
> After 0965a41, mirror starts several smaller requests in parallel, when
> BLOCK_JOB_COMPLETED emited we have some successful non-zero progress.
[...]

> --- a/tests/qemu-iotests/109.out
> +++ b/tests/qemu-iotests/109.out
> @@ -135,7 +135,7 @@ Automatically detecting the format is dangerous for raw 
> images, write operations
>  Specify the 'raw' format explicitly to remove the restrictions.
>  {"return": {}}
>  {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
> "BLOCK_JOB_ERROR", "data": {"device": "src", "operation": "write", "action": 
> "report"}}
> -{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
> "BLOCK_JOB_COMPLETED", "data": {"device": "src", "len": 2560, "offset": 0, 
> "speed": 0, "type": "mirror", "error": "Operation not permitted"}}
> +{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
> "BLOCK_JOB_COMPLETED", "data": {"device": "src", "len": 2560, "offset": 
> OFFSET, "speed": 0, "type": "mirror", "error": "Operation not permitted"}}

What are the exact semantics of the "offset" field for
BLOCK_JOB_COMPLETED?

docs/qmp-events.txt is rather vague. As an API consumer I'd have assumed
that everything up to offset has been completed successfully. If that
interpretation is correct, offset must be 0 for this test because the
very first sector wasn't mirrored successfully.

Sascha
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