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authorThierry Vignaud <tvignaud@mandriva.org>2002-07-23 11:08:35 +0000
committerThierry Vignaud <tvignaud@mandriva.org>2002-07-23 11:08:35 +0000
commit61b0cd36577df2a9f86cb2c08d14737f0bbcb557 (patch)
tree08dfd2ab02af6b7c7410158a531a95c2db7b3350 /perl-install/partition_table/gpt.pm
parent6ed6b5341362f87e3c70420f206a33f71c72a3de (diff)
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g Move 2: partition table: hierarchy
Diffstat (limited to 'perl-install/partition_table/gpt.pm')
-rw-r--r--perl-install/partition_table/gpt.pm266
1 files changed, 266 insertions, 0 deletions
diff --git a/perl-install/partition_table/gpt.pm b/perl-install/partition_table/gpt.pm
new file mode 100644
index 000000000..01de8f8a7
--- /dev/null
+++ b/perl-install/partition_table/gpt.pm
@@ -0,0 +1,266 @@
+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;