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Re: [Qemu-devel] [PATCH v2 7/7] qemu-iotests: add 039 qcow2 lazy refcoun

From: Kevin Wolf
Subject: Re: [Qemu-devel] [PATCH v2 7/7] qemu-iotests: add 039 qcow2 lazy refcounts test
Date: Thu, 26 Jul 2012 15:28:23 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0

Am 25.07.2012 14:21, schrieb Stefan Hajnoczi:
> This tests establishes the basic post-conditions of the qcow2 lazy
> refcounts features:
>   1. If the image was closed normally, it is marked clean.
>   2. If an allocating write was performed and the image was not close
>      normally, then it is marked dirty.
>      a. Written data can be read back successfully.
>      b. The image file can be repaired and will be marked clean again.
> Signed-off-by: Stefan Hajnoczi <address@hidden>

I think an important case that is missing here is opening a dirty image
rw without having run qemu-img check -r first.

> +== Read-only access must still work ==
> +read 512/512 bytes at offset 0
> +512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> +incompatible_features     0x1
> +
> +== Repairing the image file must succeed ==
> +ERROR OFLAG_COPIED: offset=8000000000050000 refcount=0
> +Repairing cluster 5 refcount=0 reference=1
> +No errors were found on the image.
> +incompatible_features     0x0

I wonder what happened to the "The following inconsistencies were found
and repaired" message. Most likely not a problem with qemu-iotests,
though, but something unexpected in qemu-img.


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