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From: Aaron Lauterer <a.lauterer@proxmox.com>
To: pve-devel@lists.proxmox.com
Date: Thu, 1 Jun 2023 15:53:41 +0200
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Subject: [pve-devel] [PATCH v3 container 6/7] migration: fail when aliased
volume is detected
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Aliased volumes (referencing the same volume multiple times) can lead to
unexpected behavior in a migration.
Therefore, stop the migration in such a case.
The check works by comparing the path returned by the storage plugin.
This means that we should be able to catch the common situations where
it can happen:
* by referencing the same volid multiple times
* having a different volid due to an aliased storage: different storage
name but pointing to the same location.
We decided against checking the storages themselves being aliased. It is
not possible to infer that reliably from just the storage configuration
options alone.
Signed-off-by: Aaron Lauterer <a.lauterer@proxmox.com>
---
src/PVE/LXC/Migrate.pm | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/src/PVE/LXC/Migrate.pm b/src/PVE/LXC/Migrate.pm
index c5bca7a..7405600 100644
--- a/src/PVE/LXC/Migrate.pm
+++ b/src/PVE/LXC/Migrate.pm
@@ -182,6 +182,7 @@ sub phase1 {
my $volhash = {}; # 'config', 'snapshot' or 'storage' for local volumes
my $volhash_errors = {};
my $abort = 0;
+ my $path_to_volid = {};
my $log_error = sub {
my ($msg, $volid) = @_;
@@ -231,6 +232,8 @@ sub phase1 {
die "owned by other guest (owner = $owner)\n"
if !$owner || ($owner != $self->{vmid});
+ $path_to_volid->{$path}->{$volid} = 1;
+
if (defined($snapname)) {
# we cannot migrate shapshots on local storage
# exceptions: 'zfspool', 'btrfs'
@@ -277,6 +280,12 @@ sub phase1 {
# finally all current volumes
PVE::LXC::Config->foreach_volume_full($conf, { include_unused => 1 }, $test_mp);
+ for my $path (keys %$path_to_volid) {
+ my @volids = keys $path_to_volid->{$path}->%*;
+ die "detected not supported aliased volumes: '" . join("', '", @volids) . "'"
+ if (scalar @volids > 1);
+ }
+
# additional checks for local storage
foreach my $volid (keys %$volhash) {
eval {
--
2.30.2