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From: Aaron Lauterer <a.lauterer@proxmox.com>
To: pve-devel@lists.proxmox.com
Date: Fri, 16 Jun 2023 11:57:04 +0200
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Subject: [pve-devel] [PATCH v4 qemu-server 8/12] migration: fail when
 aliased volume is detected
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Aliased volids can lead to unexpected behavior in a migration.

An aliased volid can happen if we have two storage configurations,
pointing to the same place. The resulting 'path' for a disk image
will be the same.
Therefore, stop the migration in such a case.

The check works by comparing the path returned by the storage plugin.

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>
---
changes since v3: none

 PVE/QemuMigrate.pm | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/PVE/QemuMigrate.pm b/PVE/QemuMigrate.pm
index 9e80866..d29e1aa 100644
--- a/PVE/QemuMigrate.pm
+++ b/PVE/QemuMigrate.pm
@@ -299,12 +299,12 @@ sub scan_local_volumes {
 
     my $storecfg = $self->{storecfg};
     eval {
-
 	# found local volumes and their origin
 	my $local_volumes = $self->{local_volumes};
 	my $local_volumes_errors = {};
 	my $other_errors = [];
 	my $abort = 0;
+	my $path_to_volid = {};
 
 	my $log_error = sub {
 	    my ($msg, $volid) = @_;
@@ -392,6 +392,8 @@ sub scan_local_volumes {
 	    die "owned by other VM (owner = VM $owner)\n"
 		if !$owner || ($owner != $vmid);
 
+	    $path_to_volid->{$path}->{$volid} = 1;
+
 	    return if $attr->{is_vmstate};
 
 	    if (defined($snaprefs)) {
@@ -425,6 +427,12 @@ sub scan_local_volumes {
 	    }
         });
 
+	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);
+	}
+
 	foreach my $vol (sort keys %$local_volumes) {
 	    my $type = $replicatable_volumes->{$vol} ? 'local, replicated' : 'local';
 	    my $ref = $local_volumes->{$vol}->{ref};
-- 
2.39.2