diff options
Diffstat (limited to 'perl-install/partition_table/gpt.pm')
| -rw-r--r-- | perl-install/partition_table/gpt.pm | 342 |
1 files changed, 120 insertions, 222 deletions
diff --git a/perl-install/partition_table/gpt.pm b/perl-install/partition_table/gpt.pm index bb1cb82a4..af5509f27 100644 --- a/perl-install/partition_table/gpt.pm +++ b/perl-install/partition_table/gpt.pm @@ -1,4 +1,4 @@ -package partition_table::gpt; # $Id$ +package partition_table::gpt; use diagnostics; use strict; @@ -6,258 +6,156 @@ use vars qw(@ISA); @ISA = qw(partition_table::raw); -use common; +use fs::type; use partition_table::raw; -use partition_table::dos; -use partition_table; use c; -my %gpt_types = ( - 0x00 => "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", - 0x82 => "\x6d\xfd\x57\x06\xab\xa4\xc4\x43\x84\xe5\x09\x33\xc8\x4b\x4f\x4f", - 0x83 => "\xA2\xA0\xD0\xEB\xE5\xB9\x33\x44\x87\xC0\x68\xB6\xB7\x26\x99\xC7", - 0x8e => "\x79\xd3\xd6\xe6\x07\xf5\xc2\x44\xa2\x3c\x23\x8f\x2a\x3d\xf9\x28", - 0xfd => "\x0f\x88\x9d\xa1\xfc\x05\x3b\x4d\xa0\x06\x74\x3f\x0f\x84\x91\x1e", - 0xef => "\x28\x73\x2A\xC1\x1F\xF8\xd2\x11\xBA\x4B\x00\xA0\xC9\x3E\xC9\x3B", - # legacy_partition_table => "\x41\xEE\x4D\x02\xE7\x33\xd3\x11\x9D\x69\x00\x08\xC7\x81\xF3\x9F" - # PARTITION_MSFT_RESERVED_GUID "\x16\xE3\xC9\xE3\x5C\x0B\xB8\x4D\x81\x7D\xF9\x2D\xF0\x02\x15\xAE" - #PARTITION_RESERVED_GUID "\x39\x33\xa6\x8d\x07\x00\xc0\x60\xc4\x36\x08\x3a\xc8\x23\x09\x08" -); - -my $current_revision = 0x00010200; -my ($main_format, $main_fields) = list2kv( - a8 => 'magic', - V => 'revision', - V => 'headerSize', - V => 'headerCRC32', - a4 => 'blank1', - Q => 'myLBA', - Q => 'alternateLBA', - Q => 'firstUsableLBA', - Q => 'lastUsableLBA', - a16 => 'guid', - Q => 'partitionEntriesLBA', - V => 'nbPartitions', - V => 'partitionEntrySize', - V => 'partitionEntriesCRC32', -); - -my ($partitionEntry_format, $partitionEntry_fields) = list2kv( - a16 => 'gpt_type', - a16 => 'guid', - Q => 'start', - Q => 'ending', - a8 => 'efi_attributes', - a72 => 'name', -); - -my ($guid_format, $guid_fields) = list2kv( - N => 'time_low', - n => 'time_mid', - n => 'time_hi_and_version', - n => 'clock_seq', - a6 => 'node', -); - -$_ = join('', @$_) foreach $main_format, $partitionEntry_format, $guid_format; - -my $magic = "EFI PART"; - -sub generate_guid() { - my $tmp; - open(my $F, devices::make("random")) or die "Could not open /dev/random for GUID generation"; - read $F, $tmp, psizeof($guid_format); - - my %guid; @guid{@$guid_fields} = unpack $guid_format, $tmp; - $guid{clock_seq} = ($guid{clock_seq} & 0x3fff) | 0x8000; - $guid{time_hi_and_version} = ($guid{time_hi_and_version} & 0x0fff) | 0x4000; - pack($guid_format, @guid{@$guid_fields}); -} +=head1 SYNOPSYS -sub crc32 { - my ($buffer) = @_; +Read/write GUID partition tables (GPT) - my $crc = 0xFFFFFFFF; - foreach (unpack "C*", $buffer) { - my $subcrc = ($crc ^ $_) & 0xFF; - for (my $j = 8; $j > 0; $j--) { - my $b = $subcrc & 1; - $subcrc = ($subcrc >> 1) & 0x7FFFFFFF; - $subcrc = $subcrc ^ 0xEDB88320 if $b; - } - $crc = ($crc >> 8) ^ $subcrc; - } - $crc ^ 0xFFFFFFFF; -} +See https://en.wikipedia.org/wiki/GUID_Partition_Table#Partition_type_GUIDs for a list of exitings GUIDs -sub compute_headerCRC32 { - my ($info) = @_; - local $info->{headerCRC32} = 0; - crc32(pack($main_format, @$info{@$main_fields})); -} +=head1 Functions -sub read_header { - my ($sector, $F) = @_; - my $tmp; +=over - c::lseek_sector(fileno($F), $sector, 0) or die "reading of partition in sector $sector failed"; +=cut +my $nb_primary = 128; - sysread $F, $tmp, psizeof($main_format) or die "error while reading partition table in sector $sector"; - my %info; @info{@$main_fields} = unpack $main_format, $tmp; - - $info{magic} eq $magic or die "bad magic number"; - $info{myLBA} == $sector or die "myLBA is not the same"; - $info{headerSize} == psizeof($main_format) or die "bad partition table header size"; - $info{partitionEntrySize} == psizeof($partitionEntry_format) or die "bad partitionEntrySize"; - $info{revision} <= $current_revision or log::l("oops, this is a new GPT revision ($info{revision} > $current_revision)"); - $info{headerCRC32} == compute_headerCRC32(\%info) or die "bad partition table checksum"; - \%info -} +sub first_usable_sector { 34 } -sub read_partitionEntries { - my ($info, $F) = @_; - my $tmp; - - c::lseek_sector(fileno($F), $info->{partitionEntriesLBA}, 0) or die "can't seek to sector partitionEntriesLBA"; - sysread $F, $tmp, psizeof($partitionEntry_format) * $info->{nbPartitions} or die "error while reading partition table in sector $info->{partitionEntriesLBA}"; - $info->{partitionEntriesCRC32} == crc32($tmp) or die "bad partition entries checksum"; - - c::lseek_sector(fileno($F), $info->{partitionEntriesLBA}, 0) or die "can't seek to sector partitionEntriesLBA"; - my %gpt_types_rev = reverse %gpt_types; - my @pt = - map { - sysread $F, $tmp, psizeof($partitionEntry_format) or die "error while reading partition table in sector $info->{partitionEntriesLBA}"; - my %h; @h{@$partitionEntry_fields} = unpack $partitionEntry_format, $tmp; - $h{size} = $h{ending} - $h{start} + 1; - $h{type} = $gpt_types_rev{$h{gpt_type}}; - $h{type} = 0x100 if !defined $h{type}; - \%h; - } (1 .. $info->{nbPartitions}); - \@pt; +sub last_usable_sector { + my ($hd) = @_; + #- do not use totalsectors because backup GPT is at end + $hd->{totalsectors} - 33; } -sub read { - my ($hd, $sector) = @_; - - my $l = partition_table::dos::read($hd, $sector); - my @l = grep { $_->{size} && $_->{type} && !partition_table::isExtended($_) } @$l; - @l == 1 or die "bad PMBR"; - $l[0]{type} == 0xee or die "bad PMBR"; - my $myLBA = $l[0]{start}; - - my $F = partition_table::raw::openit($hd) or die "failed to open device"; - my $info1 = eval { read_header($myLBA, $F) }; - my $info2 = eval { read_header($info1->{alternateLBA} || $l[0]{start} + $l[0]{size} - 1, $F) }; #- what about using $hd->{totalsectors} ??? - my $info = $info1 || { %$info2, myLBA => $info2->{alternateLBA}, alternateLBA => $info2->{myLBA}, partitionEntriesLBA => $info2->{alternateLBA} + 1 } or die; - my $pt = $info1 && $info2 ? - eval { $info1 && read_partitionEntries($info1, $F) } || read_partitionEntries($info2, $F) : - read_partitionEntries($info, $F); - $hd->raw_removed($pt); - - $pt, $info; +my %parted_mapping = ( + 'linux-swap(v1)' => 'swap', + 'ntfs' => 'ntfs-3g', + 'fat16' => 'vfat', + 'fat32' => 'vfat', + ); +my %rev_parted_mapping = reverse %parted_mapping; +# prefer 'fat32' over 'fat16': +$rev_parted_mapping{vfat} = 'fat32'; + +sub read_one { + my ($hd, $_sector) = @_; + + $hd->{current_pt_table_type} eq "gpt" or die "$hd->{device} not a GPT disk ($hd->{file})"; + + my @pt; + foreach (c::get_disk_partitions($hd->{file})) { + # compatibility with MBR partitions tables: + $_->{pt_type} = 0x82 if $_->{fs_type} eq 'swap'; + $_->{pt_type} = 0x0b if $_->{fs_type} eq 'vfat'; + $_->{pt_type} = 0x83 if $_->{fs_type} =~ /^ext/; + + # fix detecting ESP (special case are they're detected through pt_type): + if ($_->{flag} eq 'ESP') { + $_->{pt_type} = 0xef; + } elsif ($_->{flag} eq 'BIOS_GRUB') { + $_->{fs_type} = $_->{flag}; # hack to prevent it to land in hd->{raw} + $_->{pt_type} = $_->{flag}; # hack... + } elsif ($_->{flag} eq 'LVM') { + $_->{pt_type} = 0x8e; + } elsif ($_->{flag} eq 'RAID') { + $_->{pt_type} = 0xfd; + } elsif ($_->{flag} eq 'RECOVERY') { + $_->{pt_type} = 0x12; + } + $_->{fs_type} = $parted_mapping{$_->{fs_type}} if $parted_mapping{$_->{fs_type}}; + + @pt[$_->{part_number}-1] = $_; + } + + for (my $part_number = 1; $part_number < $nb_primary; $part_number++) { + next if exists($pt[$part_number-1]); + $pt[$part_number-1] = { part_number => $part_number }; + } + + \@pt; } -# write the partition table (and extended ones) -# for each entry, it uses fields: start, size, type, active sub write { - my ($hd, $sector, $pt, $info) = @_; + my ($hd, $_handle, $_sector, $pt, $_info) = @_; + + my $ped_disk; + my $partitions_killed; - foreach (@$pt) { - $_->{ending} = $_->{start} + $_->{size} - 1; - $_->{guid} ||= generate_guid(); - $_->{gpt_type} = $gpt_types{$_->{type}} || $_->{gpt_type} || $gpt_types{0x83}; + # Initialize the disk if current partition table is not gpt + if ($hd->{current_pt_table_type} ne "gpt") { + $ped_disk = c::disk_open($hd->{file}, "gpt") or die "failed to create new partition table on $hd->{file}"; + $partitions_killed = 1; + } else { + $ped_disk = c::disk_open($hd->{file}) or die "failed to open partition table on $hd->{file}"; } - my $partitionEntries = join('', map { - pack($partitionEntry_format, @$_{@$partitionEntry_fields}) - } (@$pt, ({}) x ($info->{nbPartitions} - @$pt))); - - $info->{partitionEntriesCRC32} = crc32($partitionEntries); - $info->{headerCRC32} = compute_headerCRC32($info); - - my $info2 = { %$info, - myLBA => $info->{alternateLBA}, alternateLBA => $info->{myLBA}, - partitionEntriesLBA => $info->{alternateLBA} - psizeof($partitionEntry_format) * $info->{nbPartitions} / 512, - }; - $info2->{headerCRC32} = compute_headerCRC32($info2); - - { - # write the PMBR - my $pmbr = partition_table::dos::clear_raw(); - $pmbr->{raw}[0] = { type => 0xee, local_start => $info->{myLBA}, size => $info->{alternateLBA} - $info->{myLBA} + 1 }; - partition_table::dos::write($hd, $sector, $pmbr->{raw}); + + foreach (@{$hd->{will_tell_kernel}}) { + my ($action, $part_number, $o_start, $o_size) = @$_; + my ($part) = grep { $_->{start} == $o_start && $_->{size} == $o_size } @$pt; + log::l("GPT partitioning: ($action, $part_number, $o_start, $o_size)"); + if ($action eq 'add') { + local $part->{fs_type} = $rev_parted_mapping{$part->{fs_type}} if $rev_parted_mapping{$part->{fs_type}}; + c::disk_add_partition($ped_disk, $o_start, $o_size, $part->{fs_type}) or die "failed to add partition #$part_number on $hd->{file}"; + my $flag; + if (isESP($part)) { + $flag = 'ESP'; + } elsif (isBIOS_GRUB($part)) { + $flag = 'BIOS_GRUB'; + } elsif (isRawLVM($part)) { + $flag = 'LVM'; + } elsif (isRawRAID($part)) { + $flag = 'RAID'; + } + if ($flag) { + c::set_partition_flag($ped_disk, $part_number, $flag) + or die "failed to set type '$flag' for $part->{file} on $part->{mntpoint}"; + } + } elsif ($action eq 'del' && !$partitions_killed) { + c::disk_del_partition($ped_disk, $part_number) or die "failed to del partition #$part_number on $hd->{file}"; + } elsif ($action eq 'init' && !$partitions_killed) { + c::disk_delete_all($ped_disk) or die "failed to delete all partitions on $hd->{file}"; + } } - my $F = partition_table::raw::openit($hd, 2) or die "error opening device $hd->{device} for writing"; - - c::lseek_sector(fileno($F), $info->{myLBA}, 0) or return 0; - #- pad with 0's - syswrite $F, pack($main_format, @$info{@$main_fields}) . "\0" x 512, 512 or return 0; + # Commit changes to the disk and inform the kernel + my $commit_level = c::disk_commit($ped_disk); + # Updating the kernel partition table will fail if any of the deleted partitions were mounted + $hd->{rebootNeeded} = 1 if $commit_level < 2; + $commit_level; +} - c::lseek_sector(fileno($F), $info->{alternateLBA}, 0) or return 0; - #- pad with 0's - syswrite $F, pack($main_format, @$info2{@$main_fields}) . "\0" x 512, 512 or return 0; +=item need_to_tell_kernel($hd) - c::lseek_sector(fileno($F), $info->{partitionEntriesLBA}, 0) or return 0; - syswrite $F, $partitionEntries or return 0; - - c::lseek_sector(fileno($F), $info2->{partitionEntriesLBA}, 0) or return 0; - syswrite $F, $partitionEntries or return 0; +Hint partition_table::write() that telling the kernel to reread the +partition_table is not needed if we already succeeded in that - common::sync(); - 1; -} +=cut -sub raw_removed { - my ($_hd, $raw) = @_; - @$raw = grep { $_->{size} && $_->{type} } @$raw; -} -sub can_raw_add { +sub need_to_tell_kernel { my ($hd) = @_; - @{$hd->{primary}{raw}} < $hd->{primary}{info}{nbPartitions}; + # If we failed, try again (partion_table::tell_kernel() will unmount some partitions first) + $hd->{rebootNeeded}; } -sub raw_add { - my ($hd, $raw, $part) = @_; - $hd->can_raw_add or die "raw_add: partition table already full"; - push @$raw, $part; + +sub initialize { + my ($class, $hd) = @_; + # part_number starts at 1 + my @raw = map { +{ part_number => $_ + 1 } } 0..$nb_primary-2; + $hd->{primary} = { raw => \@raw }; + bless $hd, $class; } +sub can_add { &can_raw_add } sub adjustStart {} sub adjustEnd {} -sub first_usable_sector { - my ($hd) = @_; - $hd->{primary}{info}{firstUsableLBA}; -} -sub last_usable_sector { - my ($hd) = @_; - $hd->{primary}{info}{lastUsableLBA} + 1; -} +=back -sub info { - my ($hd) = @_; - my $nb_sect = 32; - - #- build a default suitable partition table, - #- checksum will be built when writing on disk. - { - magic => $magic, - revision => $current_revision, - headerSize => psizeof($main_format), - myLBA => 1, - alternateLBA => $hd->{totalsectors} - 1, - firstUsableLBA => $nb_sect + 2, - lastUsableLBA => $hd->{totalsectors} - $nb_sect - 2, - guid => generate_guid(), - partitionEntriesLBA => 2, - nbPartitions => $nb_sect * 512 / psizeof($partitionEntry_format), - partitionEntrySize => psizeof($partitionEntry_format), - }; -} - -sub clear_raw { - my ($hd) = @_; - { raw => [], info => info($hd) }; -} +=cut 1; |