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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 {
my ($in) = @_;
$::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) = @_;
foreach (@{allmodules()}) {
eval { modules::load($_) };
}
detect_during_install_once(@parts);
detect_during_install_once(@parts) if active_mds(); #- try again to detect RAID 10
foreach (inactive_mds()) {
log::l("$_ is an inactive md, we stop it to ensure it doesn't busy devices");
run_program::run('mdadm', '--stop', devices::make($_));
}
}
sub detect_during_install_once {
my (@parts) = @_;
devices::make("md$_") foreach 0 .. max_nb();
output('/etc/mdadm.conf', join(' ', 'DEVICE',
(map { "/dev/$_" } active_mds()),
map { devices::make($_->{device}) } @parts), "\n");
run_program::run('mdadm', '>>', '/etc/mdadm.conf', '--examine', '--scan');
run_program::run('mdadm', '--assemble', '--scan');
}
sub get_existing {
my @parts = @_;
my $raids = [];
foreach my $md (active_mds()) {
my $raw_part = get_md_info(devices::make($md)) or next;
$raw_part->{level} =~ s/raid//; #- { linear | raid0 | raid1 | raid5 | raid6 } -> { linear | 0 | 1 | 5 | 6 }
my @mdparts =
map {
if (my $part = fs::get::device2part($_, [ @parts, @$raids ])) {
$part;
} else {
log::l("ERROR: unknown raw raid device $_");
();
}
} split(',', $raw_part->{devices});
my $md_part = new($raids,
device => $md,
UUID => $raw_part->{UUID},
level => $raw_part->{level},
metadata => $raw_part->{metadata},
disks => \@mdparts);
my $type = fs::type::type_subpart_from_magic($md_part);
if ($type) {
put_in_hash($md_part, $type);
} else {
fs::type::set_fs_type($md_part, defaultFS());
}
my $fs_type = $type && $type->{fs_type};
fs::type::set_isFormatted($md_part, to_bool($fs_type));
log::l("RAID: found $md (raid $md_part->{level}) type $fs_type with parts $raw_part->{devices}");
}
$raids;
}
sub is_active {
my ($dev) = @_;
member($dev, active_mds());
}
sub write_conf {
my ($raids) = @_;
@$raids or return;
my @devices = uniq(map { devices::make($_->{device}) } map { @{$_->{disks}} } @$raids);
output($::isInstall ? "$::prefix/etc/mdadm.conf" : "/etc/mdadm.conf",
join(' ', 'DEVICE', @devices) . "\n",
map { "ARRAY " . devices::make($_->{device}) . " UUID=$_->{UUID} auto=yes\n" } @$raids);
}
sub get_md_info {
my ($dev) = @_;
my $conf = parse_mdadm_conf(scalar run_program::get_stdout('mdadm', '--detail', '--brief', '-v', $dev));
@{$conf->{ARRAY}} or return;
@{$conf->{ARRAY}} == 1 or internal_error("too many answers");
$conf->{ARRAY}[0];
}
sub parse_mdadm_conf {
my ($s) = @_;
my %conf = (DEVICE => [], ARRAY => []);
$s =~ s!^\s*#.*!!gm; #- remove comments
$s =~ s!\n(\s)!$1!g; #- join lines starting with a space
foreach (split("\n", $s)) {
if (/^DEVICE\s+(.*)/) {
push @{$conf{DEVICE}}, split(' ', $1);
} elsif (my ($md, $md_conf) = /^ARRAY\s+(\S+)\s*(.*)/) {
my %md_conf = map { if_(/(.*)=(.*)/, $1 => $2) } split(' ', $md_conf);
$md_conf{level} =~ s/^raid//;
$md_conf{device} = $md;
push @{$conf{ARRAY}}, \%md_conf;
}
}
\%conf;
}
1;
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