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package lvm; # $Id$
use diagnostics;
use strict;
#-######################################################################################
#- misc imports
#-######################################################################################
use common;
use modules;
use fsedit;
use devices;
use run_program;
#- for partition_table_xxx emulation
sub new {
my ($class, $name) = @_;
$name =~ s/\W/_/g;
$name = substr($name, 0, 63); # max length must be < NAME_LEN / 2 where NAME_LEN is 128
bless { disks => [], VG_name => $name }, $class;
}
sub hasExtended { 0 }
sub adjustStart {}
sub adjustEnd {}
sub write {}
sub cylinder_size {
my ($hd) = @_;
$hd->{extent_size};
}
init();
sub init() {
eval { modules::load('dm-mod') };
devices::make('urandom');
my $control = '/dev/mapper/control';
if (! -e $control) {
my ($major) = cat_('/proc/devices') =~ /(\d+) misc$/m or die "device-mapper error";
my ($minor) = cat_('/proc/misc') =~ /(\d+) device-mapper$/m or die "device-mapper error";
mkdir_p(dirname($control));
syscall_('mknod', $control, c::S_IFCHR() | 0600, makedev($major, $minor)) or die "mknod $control failed: $!";
}
run_program::run('lvm2', 'vgscan') if !-e '/etc/lvmtab';
run_program::run('lvm2', 'vgchange', '-a', 'y');
}
sub lvm_cmd {
if (my $r = run_program::run('lvm2', @_)) {
$r;
} else {
$? >> 8 == 98 or return;
#- sometimes, it needs running vgscan again, doing so:
run_program::run('lvm2', 'vgscan');
run_program::run('lvm2', @_);
}
}
sub lvm_cmd_or_die {
my ($prog, @para) = @_;
lvm_cmd($prog, @para) or die "$prog failed\n";
}
sub check {
my ($in) = @_;
$in->do_pkgs->ensure_is_installed('lvm2', '/sbin/lvm2') or return;
init();
1;
}
sub get_vg {
my ($part) = @_;
my $dev = expand_symlinks(devices::make($part->{device}));
run_program::get_stdout('lvm2', 'pvs', '--noheadings', '-o', 'vg_name', $dev) =~ /(\S+)/ && $1;
}
sub update_size {
my ($lvm) = @_;
$lvm->{extent_size} = to_int(run_program::get_stdout('lvm2', 'vgs', '--noheadings', '--nosuffix', '--units', 's', '-o', 'vg_extent_size', $lvm->{VG_name}));
$lvm->{totalsectors} = to_int(run_program::get_stdout('lvm2', 'vgs', '--noheadings', '--nosuffix', '--units', 's', '-o', 'vg_size', $lvm->{VG_name}));
}
sub get_lv_size {
my ($lvm_device) = @_;
to_int(run_program::get_stdout('lvm2', 'lvs', '--noheadings', '--nosuffix', '--units', 's', '-o', 'lv_size', "/dev/$lvm_device"));
}
sub get_lvs {
my ($lvm) = @_;
my @l = run_program::get_stdout('lvm2', 'lvs', '--noheadings', '--nosuffix', '--units', 's', '-o', 'lv_name', $lvm->{VG_name}) =~ /(\S+)/g;
$lvm->{primary}{normal} =
[
map {
my $device = "$lvm->{VG_name}/$_";
my $pt_type = -e "/dev/$device" && fsedit::typeOfPart($device);
{ device => $device,
type => $pt_type || 0x83,
size => get_lv_size($device) }
} @l
];
}
sub vg_add {
my ($part) = @_;
my $dev = expand_symlinks(devices::make($part->{device}));
lvm_cmd_or_die('pvcreate', '-y', '-ff', $dev);
my $prog = lvm_cmd('vgs', $part->{lvm}) ? 'vgextend' : 'vgcreate';
lvm_cmd_or_die($prog, $part->{lvm}, $dev);
}
sub vg_destroy {
my ($lvm) = @_;
is_empty_array_ref($lvm->{primary}{normal}) or die N("Remove the logical volumes first\n");
lvm_cmd('vgchange', '-a', 'n', $lvm->{VG_name});
lvm_cmd_or_die('vgremove', $lvm->{VG_name});
foreach (@{$lvm->{disks}}) {
delete $_->{lvm};
$_->{isFormatted} = 0;
$_->{notFormatted} = 1;
}
}
sub lv_delete {
my ($lvm, $lv) = @_;
lvm_cmd_or_die('lvremove', '-f', "/dev/$lv->{device}");
my $list = $lvm->{primary}{normal};
@$list = grep { $_ != $lv } @$list;
}
sub lv_create {
my ($lvm, $lv) = @_;
my $list = $lvm->{primary}{normal} ||= [];
$lv->{lv_name} ||= 1 + max(map { if_($_->{device} =~ /(\d+)$/, $1) } @$list);
$lv->{device} = "$lvm->{VG_name}/$lv->{lv_name}";
lvm_cmd_or_die('lvcreate', '--size', int($lv->{size} / 2) . 'k', '-n', $lv->{lv_name}, $lvm->{VG_name});
$lv->{size} = get_lv_size($lv->{device}); #- the created size is smaller than asked size
$lv->{notFormatted} = 1;
$lv->{isFormatted} = 0;
push @$list, $lv;
}
sub lv_resize {
my ($lv, $oldsize) = @_;
lvm_cmd_or_die($oldsize > $lv->{size} ? ('lvreduce', '-f') : 'lvextend',
'--size', int($lv->{size} / 2) . 'k', "/dev/$lv->{device}");
$lv->{size} = get_lv_size($lv->{device}); #- the resized partition may not be the exact asked size
}
1;
|
