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Re: [Qemu-block] [PATCH] qcow2: add allocated-size to image specific inf

From: Vladimir Sementsov-Ogievskiy
Subject: Re: [Qemu-block] [PATCH] qcow2: add allocated-size to image specific info
Date: Thu, 18 May 2017 14:04:34 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1

18.05.2017 13:25, Kevin Wolf wrote:
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 <address@hidden>
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?


$ ./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

It is not the same, it shows guest clusters, but we need host clusters - including all metadata, dirty bitmaps, snapshots, etc..

Best regards,

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