Re: [Qemu-devel] [PATCH 0/5 v2] qcow2 info: show highest-allocation and num-free-bytes

[Anthony Liguori]

Uri Lublin wrote:
> Hello,
>
> The following 5 enhance "info blockstats" for qcow2 images (and
> other formats that implement bdrv_get_info), to show 
> higest-allocated-offset and number-of-free-bytes (below
> the higest-allocated-offset) of the image.
>
> One of the main usage for this information is to know and act
> upon a case of end-of-storage-space. Instead of waiting for
> -ENOSPACE (which now may cause the VM to stop), one can
> define a threshold and extend the diskspace allocated for
> the image.
> This info is also good for management systems, so they
> can report the user disk space status.
>
> Also with highest_alloc and num_free_bytes, we can have a pretty 
> good idea about how fragmented a qcow2 images is, and try to
> defragment it later.
>
> Patches 1,2,3, Provides information about the highest allocated byte (offset)
> Patch 4, Provides information about the number of free bytes 
>          below highest_alloc.
> Patch 5, Provides info about highest_alloc and num_free_bytes through 
>          qemu-img info
>
>
> Changes from v1: better description of use cases.
>   

Applied all.  Thanks.

Regards,

Anthony Liguori

> Regards,
>     Uri.
>
>
>
>