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 $tmp;
}
function lvm_extend($lvpath, $size)
{
global $gbl, $sgbl, $login, $ghtml;
global $global_shell_error;
$cursize = lvm_disksize($lvpath);
$extra = $size - $cursize;
if ($extra > 0) {
$ret = lxshell_return("lvextend", "-L+{$extra}M", $lvpath);
if ($ret) {
$gbl->setWarning('extending_failed', '', $global_shell_error);
}
}
}
