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blockdev: support using zeroinit filter

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The zeroinit filter is used for cloning/mirroring and importing with
target volumes that are known to produce zeros when reading parts that
were not written before and can be helpful for performance.

Since it is the target of the mirror, it won't have a 'throttle' node
associated with it, but be added as a top node itself. Therefore, it
requires an explicit node-name.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
This commit is contained in:
Fiona Ebner 2025-07-02 18:28:05 +02:00 • committed by Fabian Grünbichler
parent d8de36c992
commit 39867932ec
1 changed files with 7 additions and 0 deletions
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7
src/PVE/QemuServer/Blockdev.pm
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@ -115,6 +115,8 @@ my sub get_node_name {
$prefix = 'f';
} elsif ($type eq 'file') {
$prefix = 'e';
} elsif ($type eq 'zeroinit') {
$prefix = 'z';
} else {
die "unknown node type '$type'";
}
@ -347,6 +349,11 @@ sub generate_drive_blockdev {
my $child = generate_file_blockdev($storecfg, $drive, $options);
$child = generate_format_blockdev($storecfg, $drive, $child, $options);
if ($options->{'zero-initialized'}) {
my $node_name = get_node_name('zeroinit', $drive_id, $drive->{file}, $options);
$child = { driver => 'zeroinit', file => $child, 'node-name' => "$node_name" };
}
# for fleecing and TPM backup, this is already the top node
return $child if $options->{fleecing} || $options->{'tpm-backup'};