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Re: [Qemu-devel] Failing QEMU iotest 175

From: Eric Blake
Subject: Re: [Qemu-devel] Failing QEMU iotest 175
Date: Thu, 2 May 2019 16:56:16 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

On 4/28/19 10:18 AM, Thomas Huth wrote:
> QEMU iotest 175 is failing for me when I run it with -raw:

>  == creating image with default preallocation ==
>  Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
> -size=1048576, blocks=0
> +size=1048576, blocks=2

What filesystem? It should be fairly obvious that 'stat -c blocks=%b' is
file-system dependent (some allocate slightly more or less space, based
on granularities and on predictions of future use), so we may need to
update the test to apply a filter or otherwise allow a bit of fuzz in
the answer. But 0/2 is definitely different than...
>  == creating image with preallocation off ==
>  Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576 preallocation=off
> -size=1048576, blocks=0
> +size=1048576, blocks=2
>  == creating image with preallocation full ==
>  Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576 preallocation=full
> -size=1048576, blocks=2048
> +size=1048576, blocks=2050

2048/2050, so we DO have some indication of whether the file is sparse
or fully allocated.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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