[pve-devel] [PATCH qemu-server 2/2] explain 'nocheck' in more places
Fabian Grünbichler
f.gruenbichler at proxmox.com
Mon Nov 21 13:16:05 CET 2022
was only explained in git history and vm_stop, add comments in other
relevant places to avoid future breakage.
Signed-off-by: Fabian Grünbichler <f.gruenbichler at proxmox.com>
---
PVE/API2/Qemu.pm | 2 ++
PVE/CLI/qm.pm | 2 ++
PVE/QemuMigrate.pm | 3 ++-
PVE/QemuServer.pm | 9 +++++++++
4 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/PVE/API2/Qemu.pm b/PVE/API2/Qemu.pm
index 6bdcce21..badfc37b 100644
--- a/PVE/API2/Qemu.pm
+++ b/PVE/API2/Qemu.pm
@@ -3200,6 +3200,8 @@ __PACKAGE__->register_method({
raise_param_exc({ skiplock => "Only root may use this option." })
if $skiplock && $authuser ne 'root at pam';
+ # nocheck is used as part of migration when config file might be still
+ # be on source node
my $nocheck = extract_param($param, 'nocheck');
raise_param_exc({ nocheck => "Only root may use this option." })
if $nocheck && $authuser ne 'root at pam';
diff --git a/PVE/CLI/qm.pm b/PVE/CLI/qm.pm
index 66feecce..3e0f1289 100755
--- a/PVE/CLI/qm.pm
+++ b/PVE/CLI/qm.pm
@@ -426,6 +426,8 @@ __PACKAGE__->register_method ({
last;
} elsif ($line =~ /^resume (\d+)$/) {
my $vmid = $1;
+ # check_running and vm_resume with nocheck, since local node
+ # might not have processed config move/rename yet
if (PVE::QemuServer::check_running($vmid, 1)) {
eval { PVE::QemuServer::vm_resume($vmid, 1, 1); };
if ($@) {
diff --git a/PVE/QemuMigrate.pm b/PVE/QemuMigrate.pm
index 5941cce6..5e466d95 100644
--- a/PVE/QemuMigrate.pm
+++ b/PVE/QemuMigrate.pm
@@ -1500,6 +1500,7 @@ sub phase3_cleanup {
$self->{errors} = 1;
}
} else {
+ # nocheck in case target node hasn't processed the config move/rename yet
my $cmd = [@{$self->{rem_ssh}}, 'qm', 'resume', $vmid, '--skiplock', '--nocheck'];
my $logf = sub {
my $line = shift;
@@ -1561,7 +1562,7 @@ sub phase3_cleanup {
}
};
- # always stop local VM
+ # always stop local VM with nocheck, since config is moved already
eval { PVE::QemuServer::vm_stop($self->{storecfg}, $vmid, 1, 1); };
if (my $err = $@) {
$self->log('err', "stopping vm failed - $err");
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 29110c0f..e1ece548 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -2788,6 +2788,12 @@ sub check_local_storage_availability {
sub check_running {
my ($vmid, $nocheck, $node) = @_;
+ # $nocheck is set when called during a migration, in which case the config
+ # file might still or already reside on the *other* node
+ # - because rename has already happened, and current node is source
+ # - because rename hasn't happened yet, and current node is target
+ # - because rename has happened, current node is target, but hasn't yet
+ # processed it yet
PVE::QemuConfig::assert_config_exists_on_node($vmid, $node) if !$nocheck;
return PVE::QemuServer::Helpers::vm_running_locally($vmid);
}
@@ -6359,6 +6365,9 @@ sub vm_suspend {
}
}
+# $nocheck is set when called as part of a migration - in this context the
+# location of the config file (source or target node) is not deterministic,
+# since migration cannot wait for pmxcfs to process the rename
sub vm_resume {
my ($vmid, $skiplock, $nocheck) = @_;
--
2.30.2
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