[pve-devel] [PATCH 4/6] add targetstorage to vm_start

[Alexandre Derumier]

This will create a new drive for each local drive found,
and start the vm with this new drives.

if targetstorage == 1, we use same sid than original vm disk

a nbd server is started in qemu and expose local volumes to network port

Signed-off-by: Alexandre Derumier <aderumier at odiso.com>
---
 PVE/API2/Qemu.pm  | 14 ++++++++++-
 PVE/QemuServer.pm | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 81 insertions(+), 2 deletions(-)

diff --git a/PVE/API2/Qemu.pm b/PVE/API2/Qemu.pm
index 013203a..da533df 100644
--- a/PVE/API2/Qemu.pm
+++ b/PVE/API2/Qemu.pm
@@ -1627,6 +1627,11 @@ __PACKAGE__->register_method({
 	    stateuri => get_standard_option('pve-qm-stateuri'),
 	    migratedfrom => get_standard_option('pve-node',{ optional => 1 }),
 	    machine => get_standard_option('pve-qm-machine'),
+	    targetstorage => {
+		description => "Target migration storage . (1 = same storeid than original)",
+		type => 'string',
+		optional => 1
+	    } 
 	},
     },
     returns => {
@@ -1657,6 +1662,13 @@ __PACKAGE__->register_method({
 	raise_param_exc({ migratedfrom => "Only root may use this option." })
 	    if $migratedfrom && $authuser ne 'root at pam';
 
+	my $targetstorage = extract_param($param, 'targetstorage');
+	raise_param_exc({ targetstorage => "Only root may use this option." })
+	    if $targetstorage && $authuser ne 'root at pam';
+
+	raise_param_exc({ targetstorage => "targetstorage can only by used with migratedfrom." })
+	    if $targetstorage && !$migratedfrom;
+	
 	# read spice ticket from STDIN
 	my $spice_ticket;
 	if ($stateuri && ($stateuri eq 'tcp') && $migratedfrom && ($rpcenv->{type} eq 'cli')) {
@@ -1697,7 +1709,7 @@ __PACKAGE__->register_method({
 		syslog('info', "start VM $vmid: $upid\n");
 
 		PVE::QemuServer::vm_start($storecfg, $vmid, $stateuri, $skiplock, $migratedfrom, undef,
-					  $machine, $spice_ticket);
+					  $machine, $spice_ticket, $targetstorage);
 
 		return;
 	    };
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index d0310b6..2489c42 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -4429,7 +4429,7 @@ sub vmconfig_update_disk {
 
 sub vm_start {
     my ($storecfg, $vmid, $statefile, $skiplock, $migratedfrom, $paused,
-	$forcemachine, $spice_ticket) = @_;
+	$forcemachine, $spice_ticket, $targetstorage) = @_;
 
     PVE::QemuConfig->lock_config($vmid, sub {
 	my $conf = PVE::QemuConfig->load_config($vmid, $migratedfrom);
@@ -4450,6 +4450,54 @@ sub vm_start {
 	# set environment variable useful inside network script
 	$ENV{PVE_MIGRATED_FROM} = $migratedfrom if $migratedfrom;
 
+	my $local_volumes = {};
+
+	if( $targetstorage ){
+
+	    foreach_drive($conf, sub {
+		my ($ds, $drive) = @_;
+
+		return if drive_is_cdrom($drive);
+
+		my $volid = $drive->{file};
+
+		return if !$volid;
+
+		my ($storeid, $volname) = PVE::Storage::parse_volume_id($volid);
+
+		my $scfg = PVE::Storage::storage_config($storecfg, $storeid);
+		return if $scfg->{shared};
+		$local_volumes->{$ds} = [$volid, $storeid, $volname];
+	    });
+
+	    my $format = undef;
+
+	    foreach my $opt (sort keys %$local_volumes) {
+
+		my ($volid, $storeid, $volname) = @{$local_volumes->{$opt}};
+		my $drive = parse_drive($opt, $conf->{$opt});
+
+		#if remote storage is specified, use default format
+		if ($targetstorage && $targetstorage != 1) {
+		    $storeid = $targetstorage;
+		    my ($defFormat, $validFormats) = PVE::Storage::storage_default_format($storecfg, $storeid);
+		    $format = $defFormat;
+		} else {
+		    #else we use same format than original
+		    $format = $drive->{format};
+		}
+
+		my $newvolid = PVE::Storage::vdisk_alloc($storecfg, $storeid, $vmid, $format, undef, ($drive->{size}/1024));
+		my $newdrive = $drive;
+		$newdrive->{format} = $format;
+		$newdrive->{file} = $newvolid;
+		my $drivestr = PVE::QemuServer::print_drive($vmid, $newdrive);
+		$local_volumes->{$opt} = $drivestr;
+		#pass drive to conf for command line
+		$conf->{$opt} = $drivestr;
+	    }
+	}
+
 	my ($cmd, $vollist, $spice_port) = config_to_command($storecfg, $vmid, $conf, $defaults, $forcemachine);
 
 	my $migrate_port = 0;
@@ -4571,6 +4619,25 @@ sub vm_start {
 	    warn $@ if $@;
 	}
 
+	#start nbd server for storage migration
+	if ($targetstorage) {
+
+	    my $nodename = PVE::INotify::nodename();
+	    my $localip = PVE::Cluster::remote_node_ip($nodename, 1);
+	    $localip = "[$localip]" if Net::IP::ip_is_ipv6($localip);
+	    my $pfamily = PVE::Tools::get_host_address_family($nodename);
+	    $migrate_port = PVE::Tools::next_migrate_port($pfamily);
+
+	    vm_mon_cmd_nocheck($vmid, "nbd-server-start", addr => { type => 'inet', data => { host => "${localip}", port => "${migrate_port}" } } );
+
+	    foreach my $opt (sort keys %$local_volumes) {
+		my $volid = $local_volumes->{$opt};
+		vm_mon_cmd_nocheck($vmid, "nbd-server-add", device => "drive-$opt", writable => JSON::true );
+		my $migrate_storage_uri = "nbd:${localip}:${migrate_port}:exportname=drive-$opt";
+		print "storage migration listens on $migrate_storage_uri volume:$volid\n";
+	    }
+	}
+
 	if ($migratedfrom) {
 
 	    eval {
-- 
2.1.4