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cloudinit: avoid unsafe write of VM config

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there's no guarantee that we're locked here and it also produces
unnecessary extra IO in most cases.

While at it also avoid that a special:cloudinit section is added on
start to *every* VM, which caused another bug to trigger (see prev.
commit) and is just odd for users that ain't using cloudinit

Note in two call sites that we may need to write the config indeed
out there on the caller side.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
This commit is contained in:
Thomas Lamprecht 2022-11-16 12:03:49 +01:00
parent eb9923f9b9
commit b137c30c3a
2 changed files with 20 additions and 19 deletions
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18
PVE/QemuServer.pm
View File

@ -5018,7 +5018,7 @@ sub vmconfig_hotplug_pending {
# some changes can be done without hotplug
my $drive = parse_drive($opt, $value);
if (drive_is_cloudinit($drive)) {
PVE::QemuServer::Cloudinit::generate_cloudinitconfig($conf, $vmid);
$conf->{cloudinit} = PVE::QemuServer::Cloudinit::generate_cloudinitconfig($conf, $vmid);
}
vmconfig_update_disk($storecfg, $conf, $hotplug_features->{disk},
$vmid, $opt, $value, $arch, $machine_type);
@ -5060,7 +5060,7 @@ sub vmconfig_hotplug_pending {
PVE::QemuConfig->write_config($vmid, $conf);
if($hotplug_features->{cloudinit}) {
if ($hotplug_features->{cloudinit}) {
my $pending = PVE::QemuServer::Cloudinit::get_pending_config($conf, $vmid);
my $regenerate = undef;
for my $item (@$pending) {
@ -5167,9 +5167,11 @@ sub vmconfig_apply_pending {
}
}
$conf->{cloudinit} = PVE::QemuServer::Cloudinit::generate_cloudinitconfig($conf, $vmid)
if $generate_cloudnit;
# write all changes at once to avoid unnecessary i/o
PVE::QemuConfig->write_config($vmid, $conf);
PVE::QemuServer::Cloudinit::generate_cloudinitconfig($conf, $vmid) if $generate_cloudnit;
}
sub vmconfig_update_net {
@ -5372,7 +5374,8 @@ sub vmconfig_update_cloudinit_drive {
return if !$cloudinit_drive;
PVE::QemuServer::Cloudinit::generate_cloudinitconfig($conf, $vmid);
$conf->{cloudinit} = PVE::QemuServer::Cloudinit::generate_cloudinitconfig($conf, $vmid);
# FIXME: write out changed config here? needs to be sure that config is locked though!
my $running = PVE::QemuServer::check_running($vmid);
if ($running) {
@ -5554,11 +5557,12 @@ sub vm_start_nolock {
if (!$statefile && scalar(keys %{$conf->{pending}})) {
vmconfig_apply_pending($vmid, $conf, $storecfg);
$conf = PVE::QemuConfig->load_config($vmid); # update/reload
}
} elsif (!$migratedfrom) {
# don't regenerate the ISO if the VM is started as part of a live migration
# this way we can reuse the old ISO with the correct config
PVE::QemuServer::Cloudinit::generate_cloudinitconfig($conf, $vmid) if !$migratedfrom;
$conf->{cloudinit} = PVE::QemuServer::Cloudinit::generate_cloudinitconfig($conf, $vmid);
# FIXME: write out changed config here? if any changes
}
# override offline migrated volumes, conf is out of date still
if (my $offline_volumes = $migrate_opts->{offline_volumes}) {

19
PVE/QemuServer/Cloudinit.pm
View File

@ -566,7 +566,6 @@ sub generate_cloudinitconfig {
PVE::QemuConfig->foreach_volume($conf, sub {
my ($ds, $drive) = @_;
my ($storeid, $volname) = PVE::Storage::parse_volume_id($drive->{file}, 1);
return if !$volname || $volname !~ m/vm-$vmid-cloudinit/;
@ -577,36 +576,34 @@ sub generate_cloudinitconfig {
$generator->($conf, $vmid, $drive, $volname, $storeid);
});
my $cloudinitconf = delete $conf->{cloudinit};
$cloudinitconf = {};
my $cloudinit_conf = {};
my @cloudinit_opts = keys %{PVE::QemuServer::cloudinit_config_properties()};
push @cloudinit_opts, 'name';
for my $opt (@cloudinit_opts) {
if ($opt =~ m/^ipconfig(\d+)/) {
my $netid = "net$1";
next if !defined($conf->{$netid});
$conf->{cloudinit}->{$netid} = $conf->{$netid};
$cloudinit_conf->{$netid} = $conf->{$netid};
}
$conf->{cloudinit}->{$opt} = $conf->{$opt} if $conf->{$opt};
$cloudinit_conf->{$opt} = $conf->{$opt} if $conf->{$opt};
}
$conf->{cloudinit}->{name} = "VM$vmid" if !$conf->{cloudinit}->{name};
my $has_cloudinit_drive = 0;
for my $opt (keys %{$conf}) {
if (PVE::QemuServer::is_valid_drivename($opt)) {
my $drive = PVE::QemuServer::parse_drive($opt, $conf->{$opt});
if (PVE::QemuServer::drive_is_cloudinit($drive)) {
$conf->{cloudinit}->{$opt} = $conf->{$opt};
$has_cloudinit_drive = 1;
$cloudinit_conf->{$opt} = $conf->{$opt};
}
}
}
$cloudinit_conf->{name} //= "VM$vmid" if $has_cloudinit_drive;
PVE::QemuConfig->write_config($vmid, $conf);
return $cloudinit_conf;
}
sub dump_cloudinit_config {