Re: [Qemu-devel] [PATCH] qcow2: add allocated-size to image specific info

[Kevin Wolf <kwolf@redhat.com>]

Am 18.05.2017 um 12:09 hat Vladimir Sementsov-Ogievskiy geschrieben:
> Shows, how much data qcow2 allocates in underlying file. This should
> be helpful on non-sparse file systems, when qemu-img info "disk size"
> doesn't provide this information.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> ---
> Hi all.
> 
> Here is an allocated-size feature for qemu-img info.

I'm not a fan of loading all L2 tables (can take some time) for
'qemu-img info' (which should be very quick). Why isn't the qemu-img
check output good enough?

Kevin

$ ./qemu-img check /tmp/test.qcow2 
No errors were found on the image.
16164/491520 = 3.29% allocated, 11.98% fragmented, 0.00% compressed clusters
Image end offset: 1060044800
$ ./qemu-img check --output=json /tmp/test.qcow2 
{
    "image-end-offset": 1060044800,
    "total-clusters": 491520,
    "check-errors": 0,
    "allocated-clusters": 16164,
    "filename": "/tmp/test.qcow2",
    "format": "qcow2",
    "fragmented-clusters": 1937
}