perl-install/raid.pm


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package raid; # $Id: raid.pm 269279 2010-05-24 14:12:09Z pterjan $

use diagnostics;
use strict;

#-######################################################################################
#- misc imports
#-######################################################################################
use common;
use fs::type;
use fs::get;
use run_program;
use devices;
use modules;

sub max_nb() { 31 }

sub check_prog {
    # perl_checker: require interactive
    my ($in) = @_; # perl_checker: $in = interactive->new
    $::prefix ? whereis_binary('mdadm') : $in->do_pkgs->ensure_binary_is_installed('mdadm', 'mdadm');
}

sub new {
    my ($raids, %opts) = @_;
    my $md_part = { %opts };
    add2hash_($md_part, { 'chunk-size' => '64', disks => [], 
			  fs_type => defaultFS(),
			  device => first(free_mds($raids)), 
			  notFormatted => 1, level => 1 });
    push @$raids, $md_part;
    foreach (@{$md_part->{disks}}) {
	$_->{raid} = $md_part->{device};
	fs::type::set_pt_type($_, 0xfd);
	delete $_->{mntpoint};
    }
    update($md_part);
    $md_part;
}

sub add {
    my ($md_part, $part) = @_;
    $md_part->{isMounted} and die N("Cannot add a partition to _formatted_ RAID %s", $md_part->{device});
    inactivate_and_dirty($md_part);
    set_isFormatted($part, 0);
    $part->{raid} = $md_part->{device};
    delete $part->{mntpoint};
    push @{$md_part->{disks}}, $part;
    update($md_part);
}

sub delete {
    my ($raids, $md_part) = @_;
    inactivate_and_dirty($md_part);
    delete $_->{raid} foreach @{$md_part->{disks}};
    @$raids = grep { $_ != $md_part } @$raids;
    write_conf($raids) if $::isStandalone;
}

sub change_device {
    my ($md_part, $new_device) = @_;
    if ($new_device ne $md_part->{device}) {
	inactivate_and_dirty($md_part);
	$md_part->{device} = $new_device;
	$_->{raid} = $new_device foreach @{$md_part->{disks}};
    }
}

sub removeDisk {
    my ($raids, $part) = @_;
    my $md_part = fs::get::device2part($part->{raid}, $raids);
    inactivate_and_dirty($md_part);
    fs::type::set_isFormatted($part, 0);
    delete $part->{raid};
    my $disks = $md_part->{disks};
    @$disks = grep { $_ != $part } @$disks;
    if (@$disks) {
	update($md_part);
    } else {
	@$raids = grep { $_ != $md_part } @$raids;
    }
    write_conf($raids) if $::isStandalone;
}

sub updateSize {
    my ($part) = @_;
    local $_ = $part->{level};
    my @l = map { $_->{size} } @{$part->{disks}};

    $part->{size} = do {
	if (/0|linear/) { sum @l }
	elsif (/1/)     { min @l }
	elsif (/4|5/)   { min(@l) * (@l - 1) }
	elsif (/6/)     { min(@l) * (@l - 2) }
	elsif (/10/)	{ min(@l) * (@l / 2) }
    };
}

sub allmodules {
    ('raid0', 'raid1', 'raid10', 'raid456');
}

sub module {
    my ($part) = @_;
    my $level = $part->{level};
    log::l("level $level");

    if (member($level, 4, 5, 6)) {
	'raid456';
    } elsif (member($level, 10)) {
	'raid10';
    } elsif ($level =~ /^\d+$/) {
	"raid$level";
    } else {
	$level;
    }
}


sub update {
    updateSize($_) foreach @_;
}

sub make {
    my ($raids, $part) = @_;    

    return if is_active($part->{device});

    inactivate_and_dirty($part);

    isRAID($_) and make($raids, $_) foreach @{$part->{disks}};
    eval { modules::load(module($part)) };

    whereis_binary('mdadm') or die 'mdadm not installed';

    my $dev = devices::make($part->{device});
    my $nb = @{$part->{disks}};

    run_program::run_or_die('mdadm', '--create', '--run', $dev, 
			    if_($nb == 1, '--force'),
			    '--chunk=' . $part->{'chunk-size'}, 
			    "--level=$part->{level}", 
			    "--raid-devices=$nb",
			    if_($part->{metadata}, "--metadata=$part->{metadata}"),
			    map { devices::make($_->{device}) } @{$part->{disks}});

    if (my $raw_part = get_md_info($dev)) {
	$part->{UUID} = $raw_part->{UUID};
    }
    write_conf($raids) if $::isStandalone;
}

sub format_part {
    my ($raids, $part) = @_;
    $part->{isFormatted} and return;

    make($raids, $part);
    fs::format::part_raw($part, undef);
    set_isFormatted($_, 1) foreach @{$part->{disks}};
}

sub verify {
    my ($raids) = @_;
    foreach (@$raids) {
	my $nb = $_->{level} =~ /6|10/ ? 4 : $_->{level} =~ /4|5/ ? 3 : 2;
	@{$_->{disks}} >= $nb or die N("Not enough partitions for RAID level %d\n", $_->{level});
    }
}

sub inactivate_and_dirty {
    my ($part) = @_;
    run_program::run('mdadm', '--stop', devices::make($part->{device}));
    set_isFormatted($part, 0);
}

sub active_mds() {
    map { if_(/^(md\S+)\s*:\s*active/, $1) } cat_("/proc/mdstat");
}
sub inactive_mds() {
    map { if_(/^(md\S+)\s*:\s*inactive/, $1) } cat_("/proc/mdstat");
}

sub free_mds {
    my ($raids) = @_;
    difference2([ map { "md$_" } 0 .. max_nb() ], [ map { $_->{device} } @$raids ]);
}

sub detect_during_install {
    my (@parts) = @_;
    eval { modules::load($_) } foreach allmodules();

    # udev may have started raids but failed due to not yet loaded modules and
    # they remains inactive ("md: personality for level 1 is not loaded!")
    stop_inactive_mds();

    detect_during_install_once(@parts);