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api: template: invert lock and fork

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like for other API calls, repeat the cheap checks done for early abort
before forking and without locks after forking and obtaining the lock,
and only hold the flock in the forked worker instead of across the fork.

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Reviewed-by: Fabian Ebner <f.ebner@proxmox.com>
This commit is contained in:
Fabian Grünbichler 2021-09-10 09:48:20 +02:00 committed by Thomas Lamprecht
parent b297918ce2
commit d2ceac56b5
1 changed files with 16 additions and 11 deletions
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17
PVE/API2/Qemu.pm
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@ -4353,8 +4353,7 @@ __PACKAGE__->register_method({
my $disk = extract_param($param, 'disk');
my $updatefn = sub {
my $load_and_check = sub {
my $conf = PVE::QemuConfig->load_config($vmid);
PVE::QemuConfig->check_lock($conf);
@ -4368,17 +4367,23 @@ __PACKAGE__->register_method({
die "you can't convert a VM to template if VM is running\n"
if PVE::QemuServer::check_running($vmid);
my $realcmd = sub {
PVE::QemuServer::template_create($vmid, $conf, $disk);
return $conf;
};
$load_and_check->();
my $realcmd = sub {
PVE::QemuConfig->lock_config($vmid, sub {
my $conf = $load_and_check->();
$conf->{template} = 1;
PVE::QemuConfig->write_config($vmid, $conf);
return $rpcenv->fork_worker('qmtemplate', $vmid, $authuser, $realcmd);
PVE::QemuServer::template_create($vmid, $conf, $disk);
});
};
return PVE::QemuConfig->lock_config($vmid, $updatefn);
return $rpcenv->fork_worker('qmtemplate', $vmid, $authuser, $realcmd);
}});
__PACKAGE__->register_method({