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plugin: add qemu_img_measure

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This compute the whole size of a qcow2 volume with datas + metadatas.
Needed for qcow2 over lvm volume.

Signed-off-by: Alexandre Derumier <alexandre.derumier@groupe-cyllene.com>
This commit is contained in:
Alexandre Derumier
2025-07-09 18:21:52 +02:00
committed by Wolfgang Bumiller
parent 933736ad6d
commit eedae199a8
1 changed files with 23 additions and 0 deletions
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23
src/PVE/Storage/Plugin.pm
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@ -710,6 +710,29 @@ sub qemu_img_info {
return PVE::Storage::Common::run_qemu_img_json($cmd, $timeout);
}
=pod
=head3 qemu_img_measure
qemu_img_measure($size, $fmt, $timeout, $is_backed)
Returns a json with the maximum size including all metadatas overhead for an image with format C<$fmt> and original size C<$size>Kb.
If the image is backed C<$is_backed>, we use different cluster size informations.
=cut
sub qemu_img_measure {
my ($size, $fmt, $timeout, $is_backed) = @_;
die "format is missing" if !$fmt;
my $cmd = ['/usr/bin/qemu-img', 'measure', '--output=json', '--size', "${size}K", '-O', $fmt];
if ($is_backed) {
my $options = $QCOW2_CLUSTERS->{backed};
push $cmd->@*, '-o', join(',', @$options) if @$options > 0;
}
return PVE::Storage::Common::run_qemu_img_json($cmd, $timeout);
}
# Storage implementation
# called during addition of storage (before the new storage config got written)