[pve-devel] [PATCH v2 manager 2/2] pve6to7: more fine-grained detection of misconfigured guest volumes

[Fabian Ebner]

If neither 'rootdir' nor 'images' are configured on a storage, but
there are guest images, just log the number of volumes found. If they
are relevant for migration, the check for unreferenced volumes will
catch them later.

Also detect content type mismatch for all volumes of existing guests,
which also covers the case of a VM image on a storage with only
'rootdir' and vice versa. To catch all such unreferenced volumes too,
it is necessary to scan all storages that do not have both content
types configured.

Change the message from 'will not work' to 'might not work'. If a
volume only referenced by a snapshot is misconfigured, it doesn't mean
that the guest doesn't work at all. Or it might be an ISO on a
misconfigured storage.

Signed-off-by: Fabian Ebner <f.ebner at proxmox.com>
---

Changes from v1 (mostly thanks to Fabian G.'s off-list feedback):
    * Add eval around vdisk_list and parse_volname.
    * Activate storage first, because vdisk_list does not do that
      for storages with neither 'rootdir' nor 'images (although it
      still scanned for disks...).
    * Also warn about unreferenced volumes on a misconfigured storage
      if a guest exists. Put a second final warning explaining that
      they are not picked up for migration anymore.
    * Don't put single quotes around the number of volumes in ouput
      (looked weird).
    * Use "Proxmox VE" instead of "PVE" in message.

 PVE/CLI/pve6to7.pm | 154 +++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 141 insertions(+), 13 deletions(-)

diff --git a/PVE/CLI/pve6to7.pm b/PVE/CLI/pve6to7.pm
index 3d5b780b..6dd7760c 100644
--- a/PVE/CLI/pve6to7.pm
+++ b/PVE/CLI/pve6to7.pm
@@ -706,11 +706,15 @@ sub check_description_lengths {
 sub check_storage_content {
     log_info("Checking storage content type configuration..");
 
-    my $found;
+    my $found_referenced;
+    my $found_unreferenced;
     my $pass = 1;
 
     my $storage_cfg = PVE::Storage::config();
 
+    my $potentially_affected = {};
+    my $referenced_volids = {};
+
     for my $storeid (keys $storage_cfg->{ids}->%*) {
 	my $scfg = $storage_cfg->{ids}->{$storeid};
 
@@ -724,8 +728,7 @@ sub check_storage_content {
 	    delete $scfg->{content}->{none}; # scan for guest images below
 	}
 
-	next if $scfg->{content}->{images};
-	next if $scfg->{content}->{rootdir};
+	next if $scfg->{content}->{images} && $scfg->{content}->{rootdir};
 
 	# Skip 'iscsi(direct)' (and foreign plugins with potentially similiar behavior) with 'none',
 	# because that means "use LUNs directly" and vdisk_list() in PVE 6.x still lists those.
@@ -733,22 +736,147 @@ sub check_storage_content {
 	# and 'images' or 'rootdir', hence being potentially misconfigured.
 	next if $scfg->{type} ne 'dir' && $scfg->{content}->{none};
 
-	my $res = PVE::Storage::vdisk_list($storage_cfg, $storeid);
-	my $disk_list = $res->{$storeid};
+	eval { PVE::Storage::activate_storage($storage_cfg, $storeid) };
+	if (my $err = $@) {
+	    log_warn("activating '$storeid' failed - $err");
+	    next;
+	}
+
+	my $res = eval { PVE::Storage::vdisk_list($storage_cfg, $storeid); };
+	if (my $err = $@) {
+	    log_warn("listing images on '$storeid' failed - $err");
+	    next;
+	}
+	my @volids = map { $_->{volid} } $res->{$storeid}->@*;
+
+	for my $volid (@volids) {
+	    $potentially_affected->{$volid} = 1;
+	}
+
+	my $number = scalar(@volids);
+	if ($number > 0 && !$scfg->{content}->{images} && !$scfg->{content}->{rootdir}) {
+	    log_info("storage '$storeid' - neither content type 'images' nor 'rootdir' configured"
+		.", but found $number guest volume(s)");
+	}
+    }
+
+    my $check_volid = sub {
+	my ($volid, $vmid, $vmtype, $reference) = @_;
+
+	$referenced_volids->{$volid} = 1 if $reference ne 'unreferenced';
+
+	my $guesttext = $vmtype eq 'qemu' ? 'VM' : 'CT';
+	my $prefix = "$guesttext $vmid - volume '$volid' ($reference)";
 
-	my @volumes = map { $_->{volid} } $disk_list->@*;
+	my ($storeid) = PVE::Storage::parse_volume_id($volid, 1);
+	return if !defined($storeid);
 
-	if (scalar(@volumes) > 0) {
-	    $found = 1;
+	my $scfg = $storage_cfg->{ids}->{$storeid};
+	if (!$scfg) {
 	    $pass = 0;
-	    log_warn("storage '$storeid' - neither content type 'images' nor 'rootdir' configured"
-		.", but found guest volume(s):\n    " . join("\n    ", @volumes));
+	    log_warn("$prefix - storage does not exist!");
+	    return;
+	}
+
+	# cannot use parse_volname for containers, as it can return 'images'
+	# but containers cannot have ISO images attached, so assume 'rootdir'
+	my $vtype = 'rootdir';
+	if ($vmtype eq 'qemu') {
+	    ($vtype) = eval { PVE::Storage::parse_volname($storage_cfg, $volid); };
+	    return if $@;
 	}
+
+	if (!$scfg->{content}->{$vtype}) {
+	    $found_referenced = 1 if $reference ne 'unreferenced';
+	    $found_unreferenced = 1 if $reference eq 'unreferenced';
+	    $pass = 0;
+	    log_warn("$prefix - storage does not have content type '$vtype' configured.");
+	}
+    };
+
+    my $guests = {};
+
+    my $cts = PVE::LXC::config_list();
+    for my $vmid (sort { $a <=> $b } keys %$cts) {
+	$guests->{$vmid} = 'lxc';
+
+	my $conf = PVE::LXC::Config->load_config($vmid);
+
+	my $volhash = {};
+
+	my $check = sub {
+	    my ($ms, $mountpoint, $reference) = @_;
+
+	    my $volid = $mountpoint->{volume};
+	    return if !$volid || $mountpoint->{type} ne 'volume';
+
+	    return if $volhash->{$volid}; # volume might be referenced multiple times
+
+	    $volhash->{$volid} = 1;
+
+	    $check_volid->($volid, $vmid, 'lxc', $reference);
+	};
+
+	my $opts = { include_unused => 1 };
+	PVE::LXC::Config->foreach_volume_full($conf, $opts, $check, 'in config');
+	for my $snapname (keys $conf->{snapshots}->%*) {
+	    my $snap = $conf->{snapshots}->{$snapname};
+	    PVE::LXC::Config->foreach_volume_full($snap, $opts, $check, "in snapshot '$snapname'");
+	}
+    }
+
+    my $vms = PVE::QemuServer::config_list();
+    for my $vmid (sort { $a <=> $b } keys %$vms) {
+	$guests->{$vmid} = 'qemu';
+
+	my $conf = PVE::QemuConfig->load_config($vmid);
+
+	my $volhash = {};
+
+	my $check = sub {
+	    my ($key, $drive, $reference) = @_;
+
+	    my $volid = $drive->{file};
+	    return if $volid =~ m|^/|;
+
+	    return if $volhash->{$volid}; # volume might be referenced multiple times
+
+	    $volhash->{$volid} = 1;
+
+	    $check_volid->($volid, $vmid, 'qemu', $reference);
+	};
+
+	my $opts = {
+	    extra_keys => ['vmstate'],
+	    include_unused => 1,
+	};
+	# startup from a suspended state works even without 'images' content type on the
+	# state storage, so do not check 'vmstate' for $conf
+	PVE::QemuConfig->foreach_volume_full($conf, { include_unused => 1 }, $check, 'in config');
+	for my $snapname (keys $conf->{snapshots}->%*) {
+	    my $snap = $conf->{snapshots}->{$snapname};
+	    PVE::QemuConfig->foreach_volume_full($snap, $opts, $check, "in snapshot '$snapname'");
+	}
+    }
+
+    if ($found_referenced) {
+	log_warn("Proxmox VE 7.0 enforces stricter content type checks. The guests above " .
+	    "might not work until the storage configuration is fixed.");
+    }
+
+    for my $volid (sort keys $potentially_affected->%*) {
+	next if $referenced_volids->{$volid}; # already checked
+
+	my (undef, undef, $vmid) = PVE::Storage::parse_volname($storage_cfg, $volid);
+	my $vmtype = $guests->{$vmid};
+	next if !$vmtype;
+
+	$check_volid->($volid, $vmid, $vmtype, 'unreferenced');
     }
 
-    if ($found) {
-	log_warn("PVE 7.0 enforces stricter content type checks. Guests referencing the above " .
-	    "volumes will not work until the storage configuration is fixed.");
+    if ($found_unreferenced) {
+	log_warn("When migrating, Proxmox VE 7.0 only scans storages with the appropriate " .
+	    "content types for unreferenced guest volumes.");
     }
 
     if ($pass) {
-- 
2.20.1