function check_xen_dirlocation()
{
$diro = getFirstFromList($this->main->__t_new_xen_location_a_list);
$dirlocation = $diro->nname;
if (!csb($dirlocation, "lvm:")) {
return;
}
$dirlocation = fix_vgname($dirlocation);
$ret = exec_with_all_closed_output("vgdisplay -c {$dirlocation}");
if (!csa($ret, ":")) {
throw new lxException("the_lvm_doesnt_exist", 'nname', $dirlocation);
}
}
public function takeSnapshot()
{
lxshell_return("modprobe", "dm-snapshot");
$tmp = "{$this->main->configrootdir}/snapshot_mount";
lxfile_mkdir($tmp);
$tmp = expand_real_root($tmp);
$size = lvm_disksize($this->main->maindisk);
$size = $size / 3;
$size = round($size);
$vgname = $this->main->corerootdir;
$vgname = fix_vgname($vgname);
$sfpath = "/dev/{$vgname}/{$this->main->nname}_snapshot";
$out = exec_with_all_closed_output("lvdisplay -c {$sfpath}");
if (csa($out, ":")) {
lxshell_return("umount", $sfpath);
lvm_remove($sfpath);
}
$out = exec_with_all_closed_output("lvdisplay -c {$sfpath}");
if (csa($out, ":")) {
throw new lxException("old_snapshot_exists_and_cant_remove");
}
$ret = lxshell_return("lvcreate", "-L{$size}M", "-s", "-n", "{$this->main->nname}_snapshot", $this->main->maindisk);
if ($ret) {
throw new lxException("could_not_create_snapshot_lack_of_space");
}
if (!$this->main->isWindows()) {
lxshell_return("e2fsck", "-f", "-y", $sfpath);
lxshell_return("mount", "-o", "ro", $sfpath, $tmp);
} else {
$tmp = $sfpath;
}
return $tmp;
}
function lvm_disksize($lvmpath)
{
//$out = exec_with_all_closed_output("lvdisplay -c /dev/$vgname/$lvmname");
//$out = explode(":", $out);
//return $out[6] / 1024;
$out = exec_with_all_closed_output("/usr/sbin/lvs --nosuffix --units b --noheadings -o lv_size {$lvmpath}");
$out = trim($out);
return $out / (1024 * 1024);
}