# lvm-lib.pl
# Common functions for managing VGs, PVs and LVs

do '../web-lib.pl';
&init_config();
&foreign_require("mount", "mount-lib.pl");
if (&foreign_check("raid")) {
	&foreign_require("raid", "raid-lib.pl");
	$has_raid++;
	}

$lvm_proc = "/proc/lvm";
$lvm_tab = "/etc/lvmtab";

# list_physical_volumes(vg)
# Returns a list of all physical volumes for some volume group
sub list_physical_volumes
{
local @rv;
opendir(DIR, "$lvm_proc/VGs/$_[0]/PVs");
foreach $f (readdir(DIR)) {
	next if ($f eq '.' || $f eq '..');
	local $pv = { 'name' => $f,
		      'vg' => $_[0] };
	local %p = &parse_colon_file("$lvm_proc/VGs/$_[0]/PVs/$f");
	$pv->{'device'} = $p{'name'};
	$pv->{'number'} = $p{'number'};
	$pv->{'size'} = $p{'size'}/2;
	$pv->{'status'} = $p{'status'};
	$pv->{'number'} = $p{'number'};
	$pv->{'pe_size'} = $p{'PE size'};
	$pv->{'pe_total'} = $p{'PE total'};
	$pv->{'pe_alloc'} = $p{'PE allocated'};
	$pv->{'alloc'} = $p{'allocatable'} == 2 ? 'y' : 'n';
	push(@rv, $pv);
	}
closedir(DIR);
return @rv;
}

# create_physical_volume(&pv)
sub create_physical_volume
{
local $cmd = "pvcreate -f -y '$_[0]->{'device'}'";
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return $out if ($?);
$cmd = "vgextend '$_[0]->{'vg'}' '$_[0]->{'device'}'";
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return $? ? $out : undef;
}

# change_physical_volume(&pv)
sub change_physical_volume
{
local $cmd = "pvchange -x $_[0]->{'alloc'} '$_[0]->{'device'}'";
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return $? ? $out : undef;
}

# delete_physical_volume(&pv)
sub delete_physical_volume
{
if ($_[0]->{'pe_alloc'}) {
	local $cmd = "(yes | pvmove '$_[0]->{'device'}')";
	local $out = &backquote_logged("$cmd 2>&1");
	return $out if ($?);
	}
local $cmd = "vgreduce '$_[0]->{'vg'}' '$_[0]->{'device'}'";
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return $? ? $out : undef;
}


# list_volume_groups()
# Returns a list of all volume groups
sub list_volume_groups
{
local (@rv, $f);
opendir(DIR, "$lvm_proc/VGs");
foreach $f (readdir(DIR)) {
	next if ($f eq '.' || $f eq '..');
	local $vg = { 'name' => $f };
	local %g = &parse_colon_file("$lvm_proc/VGs/$f/group");
	$vg->{'number'} = $g{'number'};
	$vg->{'size'} = $g{'size'};
	$vg->{'pe_size'} = $g{'PE size'};
	$vg->{'pe_total'} = $g{'PE total'};
	$vg->{'pe_alloc'} = $g{'PE allocated'};
	push(@rv, $vg);
	}
closedir(DIR);
return @rv;
}

# delete_volume_group(&vg)
sub delete_volume_group
{
local $cmd = "vgchange -a n '$_[0]->{'name'}'";
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return $out if ($?);
$cmd = "vgremove '$_[0]->{'name'}'";
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return $? ? $out : undef;
}

# create_volume_group(&vg, device)
sub create_volume_group
{
&system_logged("vgscan >/dev/null 2>&1 </dev/null");
local $cmd = "pvcreate -f -y '$_[1]'";
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return $out if ($?);
$cmd = "vgcreate";
$cmd .= " -s $_[0]->{'pe_size'}k" if ($_[0]->{'pe_size'});
$cmd .= " '$_[0]->{'name'}' '$_[1]'";
$out = &backquote_logged("$cmd 2>&1 </dev/null");
return $? ? $out : undef;
}

# rename_volume_group(&vg, name)
sub rename_volume_group
{
local $cmd = "vgrename '$_[0]->{'name'}' '$_[1]'";
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return $out if ($?);
$cmd = "vgchange -a n '$_[1]'";
$out = &backquote_logged("$cmd 2>&1 </dev/null");
return $out if ($?);
$cmd = "vgchange -a y '$_[1]'";
$out = &backquote_logged("$cmd 2>&1 </dev/null");
return $? ? $out : undef;
}


# list_logical_volumes(vg)
sub list_logical_volumes
{
local @rv;
opendir(DIR, "$lvm_proc/VGs/$_[0]/LVs");
foreach $f (readdir(DIR)) {
	next if ($f eq '.' || $f eq '..');
	local $lv = { 'name' => $f,
		      'vg' => $_[0] };
	local %p = &parse_colon_file("$lvm_proc/VGs/$_[0]/LVs/$f");
	$lv->{'device'} = $p{'name'};
	$lv->{'number'} = $p{'number'};
	$lv->{'size'} = $p{'size'}/2;
	$lv->{'perm'} = $p{'access'} == 3 ? 'rw' : 'r';
	$lv->{'alloc'} = $p{'allocation'} == 2 ? 'y' : 'n';
	$lv->{'has_snap'} = $p{'access'} == 11;
	$lv->{'is_snap'} = $p{'access'} == 5;
	push(@rv, $lv);
	}
closedir(DIR);
return @rv;
}

# create_logical_volume(&lv)
sub create_logical_volume
{
local $cmd = "lvcreate -n$_[0]->{'name'} -L$_[0]->{'size'}k";
if ($_[0]->{'is_snap'}) {
	$cmd .= " -s '/dev/$_[0]->{'vg'}/$_[0]->{'snapof'}'";
	}
else {
	$cmd .= " -p $_[0]->{'perm'}";
	$cmd .= " -C $_[0]->{'alloc'}";
	$cmd .= " -i $_[0]->{'stripe'}" if ($_[0]->{'stripe'});
	$cmd .= " $_[0]->{'vg'}";
	}
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return $? ? $out : undef;
}

# delete_logical_volume(&lv)
sub delete_logical_volume
{
local $cmd = "lvremove -f '$_[0]->{'device'}'";
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return $? ? $out : undef;
}

# resize_logical_volume(&lv, size)
sub resize_logical_volume
{
local $cmd = $_[1] > $_[0]->{'size'} ? "lvextend" : "lvreduce -f";
$cmd .= " -L$_[1]k";
$cmd .= " '$_[0]->{'device'}'";
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return $? ? $out : undef;
}

# change_logical_volume(&lv)
sub change_logical_volume
{
local $cmd = "lvchange ";
$cmd .= " -p $_[0]->{'perm'}";
$cmd .= " -C $_[0]->{'alloc'}";
$cmd .= " '$_[0]->{'device'}'";
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return $? ? $out : undef;
}

# rename_logical_volume(&lv, name)
sub rename_logical_volume
{
local $cmd = "lvrename '$_[0]->{'device'}' '/dev/$_[0]->{'vg'}/$_[1]'";
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return $? ? $out : undef;
}

# can_resize_filesystem(type)
sub can_resize_filesystem
{
if ($_[0] eq "ext2" || $_[0] eq "ext3") {
	return &has_command("e2fsadm") ? 2 : 0;
	}
# xfs_growfs doesn't work on LVMs
#elsif ($_[0] eq "xfs") {
#	return &has_command("xfs_growfs") ? 1 : 0;
#	}
else {
	return 0;
	}
}

# resize_filesystem(&lv, type, size)
sub resize_filesystem
{
if ($_[1] eq "ext2" || $_[1] eq "ext3") {
	&foreign_require("proc", "proc-lib.pl");
	local $cmd = "e2fsadm -L $_[2]k '$_[0]->{'device'}'";
	local ($fh, $fpid) = &foreign_call("proc", "pty_process_exec", $cmd);
	local $out;
	while(<$fh>) {
		$out .= $_;
		}
	close($fh);
	waitpid($fpid, 0);
	&additional_log("exec", undef, $cmd);
	return $? ? $out : undef;
	}
elsif ($_[1] eq "xfs") {
	# Resize the logical volume first

	# XXX resize the filesystem
	}
else {
	return "???";
	}
}


# parse_colon_file(file)
sub parse_colon_file
{
local %rv;
open(FILE, $_[0]);
while(<FILE>) {
	if (/^([^:]+):\s*(.*)/) {
		$rv{$1} = $2;
		}
	}
close(FILE);
return %rv;
}

# device_status(device)
# Returns an array of  directory, type, mounted
sub device_status
{
@mounted = &foreign_call("mount", "list_mounted") if (!@mounted);
@mounts = &foreign_call("mount", "list_mounts") if (!@mounts);
local $label = &fdisk::get_label($_[0]);

local ($mounted) = grep { &same_file($_->[1], $_[0]) ||
			  $_->[1] eq "LABEL=$label" } @mounted;
local ($mount) = grep { &same_file($_->[1], $_[0]) ||
			$_->[1] eq "LABEL=$label" } @mounts;
print STDERR "for $_[0] : mount = $mount  mounted = $mounted\n";
if ($mounted) { return ($mounted->[0], $mounted->[2], 1,
			&indexof($mount, @mounts),
			&indexof($mounted, @mounted)); }
elsif ($mount) { return ($mount->[0], $mount->[2], 0,
			 &indexof($mount, @mounts)); }
elsif ($has_raid) {
	$raidconf = &foreign_call("raid", "get_raidtab") if (!$raidconf);
	foreach $c (@$raidconf) {
		foreach $d (raid::find_value('device', $c->{'members'})) {
			return ( $c->{'value'}, "raid", 1 ) if ($d eq $_[0]);
			}
		}
	}
return ();
}

sub device_message
{
$msg = $_[2] ? 'lv_mount' : 'lv_umount';
$msg .= 'vm' if ($_[1] eq 'swap');
$msg .= 'raid' if ($_[1] eq 'raid');
return &text($msg, "<tt>$_[0]</tt>", "<tt>$_[1]</tt>");
}

# list_lvmtab()
sub list_lvmtab
{
local @rv;
open(TAB, $lvm_tab);
local $/ = "\0";
while(<TAB>) {
	chop;
	push(@rv, $_) if ($_);
	}
close(TAB);
return @rv;
}

# device_input()
sub device_input
{
local (%used, $vg, $pv, $d, $p);

# Find partitions that are part of an LVM
foreach $vg (&list_volume_groups()) {
	foreach $pv (&list_physical_volumes($vg->{'name'})) {
		$used{$pv->{'device'}}++;
		}
	}

# Show available partitions
print "<select name=device>\n";
foreach $d (&foreign_call("fdisk", "list_disks_partitions")) {
	foreach $p (@{$d->{'parts'}}) {
		next if ($used{$p->{'device'}} || $p->{'extended'});
		local @ds = &device_status($p->{'device'});
		next if (@ds);
		if ($p->{'type'} eq '83') {
			local $label = &fdisk::get_label($p->{'device'});
			next if ($used{"LABEL=$label"});
			}
		local $tag = &foreign_call("fdisk", "tag_name", $p->{'type'});
		printf "<option value='%s'>%s %s\n",
			$p->{'device'}, $p->{'desc'},
			$tag ? "($tag)" : "";
		}
	}

# Show available RAID devices
local $conf = &foreign_call("raid", "get_raidtab");
foreach $c (@$conf) {
	next if ($used{$c->{'value'}});
	local @ds = &device_status($c->{'value'});
	next if (@ds);
	printf "<option value='%s'>%s\n",
		$c->{'value'}, &text('pv_raid', $c->{'value'} =~ /md(\d+)$/ ? "$1" : $c->{'value'});
	}

print "<option value=''>$text{'pv_other'}\n";
print "</select>\n";
print "<input name=other size=30> ",
	&file_chooser_button("other"),"<br>\n";
print "<b>$text{'pv_warn'}</b>\n";
}

1;