From 61b0cd36577df2a9f86cb2c08d14737f0bbcb557 Mon Sep 17 00:00:00 2001 From: Thierry Vignaud Date: Tue, 23 Jul 2002 11:08:35 +0000 Subject: g Move 2: partition table: hierarchy --- perl-install/partition_table_gpt.pm | 266 ------------------------------------ 1 file changed, 266 deletions(-) delete mode 100644 perl-install/partition_table_gpt.pm (limited to 'perl-install/partition_table_gpt.pm') diff --git a/perl-install/partition_table_gpt.pm b/perl-install/partition_table_gpt.pm deleted file mode 100644 index d4c873851..000000000 --- a/perl-install/partition_table_gpt.pm +++ /dev/null @@ -1,266 +0,0 @@ -package partition_table_gpt; # $Id$ - -use diagnostics; -use strict; -use vars qw(@ISA); - -@ISA = qw(partition_table_raw); - -use common; -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; - local *F; - open 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}); -} - -sub crc32 { - my ($buffer) = @_; - - 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; - } - $crc ^ 0xFFFFFFFF; -} - -sub compute_headerCRC32 { - my ($info) = @_; - local $info->{headerCRC32} = 0; - crc32(pack($main_format, @$info{@$main_fields})); -} - -sub read_header { - my ($sector, $F) = @_; - my $tmp; - - c::lseek_sector(fileno($F), $sector, 0) or die "reading of partition in sector $sector failed"; - - 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 on disk $hd->{device}"; - $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)"); - - $info{headerCRC32} == compute_headerCRC32(\%info) or die "bad partition table checksum"; - \%info -} - -sub read_partitionEntries { - my ($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 .. $info->{nbPartitions}); - \@pt; -} - -sub read { - my ($hd, $sector) = @_; - my $tmp; - - 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 = $l[0]{start}; - - local *F; partition_table_raw::openit($hd, *F) 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, $info; -} - -# write the partition table (and extended ones) -# for each entry, it uses fields: start, size, type, active -sub write { - my ($hd, $sector, $pt, $info) = @_; - - foreach (@$pt) { - $_->{ending} = $_->{start} + $_->{size} - 1; - $_->{guid} ||= generate_guid; - $_->{gpt_type} = $gpt_types{$_->{type}} || $_->{gpt_type} || $gpt_types{0x83}; - } - 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, $pmbr->{raw}); - } - - local *F; - partition_table_raw::openit($hd, *F, 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; - - 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; - - 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, $partitionEntries or return 0; - - common::sync(); - 1; -} - -sub raw_removed { - my ($hd, $raw) = @_; - @$raw = grep { $_->{size} && $_->{type} } @$raw; -} -sub can_raw_add { - my ($hd) = @_; - @{$hd->{primary}{raw}} < $hd->{primary}{info}{nbPartitions}; -} -sub raw_add { - my ($hd, $raw, $part) = @_; - $hd->can_raw_add or die "raw_add: partition table already full"; - push @$raw, $part; -} - -sub adjustStart {} -sub adjustEnd {} - -sub first_usable_sector { - my ($hd) = @_; - $hd->{primary}{info}{firstUsableLBA}; -} -sub last_usable_sector { - my ($hd) = @_; - $hd->{primary}{info}{lastUsableLBA} + 1; -} - -sub info { - my ($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) }; -} - -1; -- cgit v1.2.1