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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/sun.pm
parent6ed6b5341362f87e3c70420f206a33f71c72a3de (diff)
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g Move 2: partition table: hierarchy
Diffstat (limited to 'perl-install/partition_table/sun.pm')
-rw-r--r--perl-install/partition_table/sun.pm201
1 files changed, 201 insertions, 0 deletions
diff --git a/perl-install/partition_table/sun.pm b/perl-install/partition_table/sun.pm
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+++ b/perl-install/partition_table/sun.pm
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+package partition_table::sun; # $Id$
+
+use diagnostics;
+use strict;
+use vars qw(@ISA);
+
+@ISA = qw(partition_table::raw);
+
+use common;
+use partition_table::raw;
+use partition_table;
+use c;
+
+my ($main_format, $main_fields) = list2kv(
+ a128 => 'info',
+ a14 => 'spare0',
+ a32 => 'infos',
+ a246 => 'spare1',
+ n => 'rspeed',
+ n => 'pcylcount',
+ n => 'sparecyl',
+ a4 => 'spare2',
+ n => 'ilfact',
+ n => 'ncyl',
+ n => 'nacyl',
+ n => 'ntrks',
+ n => 'nsect',
+ a4 => 'spare3',
+ a64 => 'partitions',
+ n => 'magic',
+ n => 'csum',
+);
+$main_format = join '', @$main_format;
+
+my ($fields1, $fields2) = ([ qw(type flags) ], [ qw(start_cylinder size) ]);
+my ($format1, $format2) = ("xCxC", "N2");
+my ($size1, $size2) = map { psizeof($_) } ($format1, $format2);
+my $magic = 0xDABE;
+my $nb_primary = 8;
+my $offset = 0;
+
+sub adjustStart($$) {
+ my ($hd, $part) = @_;
+ my $end = $part->{start} + $part->{size};
+
+ #- since partition must always start on cylinders boundaries on sparc,
+ #- note that if start sector is on the first cylinder, it is adjusted
+ #- to 0 and it is valid, cylinder 0 bug is from bad define for sparc
+ #- compilation of mke2fs combined with a blind kernel...
+ $part->{start} = round_down($part->{start}, $hd->cylinder_size());
+ $part->{size} = $end - $part->{start};
+ $part->{size} = $hd->cylinder_size() if $part->{size} <= 0;
+}
+sub adjustEnd($$) {
+ my ($hd, $part) = @_;
+ my $end = $part->{start} + $part->{size};
+ my $end2 = round_up($end, $hd->cylinder_size());
+ $end2 = $hd->{geom}{cylinders} * $hd->cylinder_size() if $end2 > $hd->{geom}{cylinders} * $hd->cylinder_size();
+ $part->{size} = $end2 - $part->{start};
+}
+
+#- compute crc checksum used for Sun Label partition, expect
+#- $tmp to be the 512 bytes buffer to be read/written to MBR.
+sub compute_crc($) {
+ my ($tmp) = @_;
+ my @l2b = unpack "n256", $tmp;
+ my $crc = 0;
+
+ map { $crc ^= $_ } @l2b;
+
+ $crc;
+}
+
+sub read($$) {
+ my ($hd, $sector) = @_;
+ my $tmp;
+
+ local *F; partition_table::raw::openit($hd, *F) or die "failed to open device";
+ c::lseek_sector(fileno(F), $sector, $offset) or die "reading of partition in sector $sector failed";
+
+ sysread F, $tmp, psizeof($main_format) or die "error while reading partition table in sector $sector";
+ my %info; @info{@$main_fields} = unpack $main_format, $tmp;
+
+ #- check magic number
+ $info{magic} == $magic or die "bad magic number on disk $hd->{device}";
+
+ #- check crc, csum contains the crc so result should be 0.
+ compute_crc($tmp) == 0 or die "bad checksum";
+
+ @{$hd->{geom}}{qw(cylinders heads sectors)} = @info{qw(ncyl ntrks nsect)};
+
+ my @pt;
+ my @infos_up = unpack $format1 x $nb_primary, $info{infos};
+ my @partitions_up = unpack $format2 x $nb_primary, $info{partitions};
+ for (0..$nb_primary-1) {
+ my $h = { type => $infos_up[2 * $_], flag => $infos_up[1 + 2 * $_],
+ start_cylinder => $partitions_up[2 * $_], size => $partitions_up[1 + 2 * $_] };
+ $h->{start} = $sector + $h->{start_cylinder} * $hd->cylinder_size();
+ $h->{type} && $h->{size} or $h->{$_} = 0 foreach keys %$h;
+ push @pt, $h;
+ }
+
+#- this code is completely broken by null char inside strings, it gets completely crazy :-)
+# my @pt = mapn {
+# my %h;
+# @h{@$fields1} = unpack $format1, $_[0];
+# @h{@$fields2} = unpack $format2, $_[1];
+# $h{start} = $sector + $h{start_cylinder} * $hd->cylinder_size();
+# $h{type} && $h{size} or $h{$_} = 0 foreach keys %h;
+# \%h;
+# } [ grep { $_ } split /(.{$size1})/o, $info{infos} ], [ grep { $_ } split /(.{$size2})/o, $info{partitions} ];
+
+ [ @pt ], \%info;
+}
+
+# write the partition table (and extended ones)
+# for each entry, it uses fields: start, size, type, active
+sub write($$$;$) {
+ my ($hd, $sector, $pt, $info) = @_;
+# my ($csize, $wdsize) = (0, 0);
+
+ #- handle testing for writing partition table on file only!
+ local *F;
+ if ($::testing) {
+ my $file = "/tmp/partition_table_$hd->{device}";
+ open F, ">$file" or die "error opening test file $file";
+ } else {
+ partition_table::raw::openit($hd, *F, 2) or die "error opening device $hd->{device} for writing";
+ c::lseek_sector(fileno(F), $sector, $offset) or return 0;
+ }
+
+ ($info->{infos}, $info->{partitions}) = map { join '', @$_ } list2kv map {
+ $_->{start} % $hd->cylinder_size() == 0 or die "partition not at beginning of cylinder";
+# $csize += $_->{size} if $_->{type} != 5;
+# $wdsize += $_->{size} if $_->{type} == 5;
+ $_->{flags} |= 0x10 if $_->{mntpoint} eq '/';
+ $_->{flags} |= 0x01 if partition_table::isSwap($_);
+ local $_->{start_cylinder} = $_->{start} / $hd->cylinder_size() - $sector;
+ pack($format1, @$_{@$fields1}), pack($format2, @$_{@$fields2});
+ } @$pt;
+# $csize == $wdsize or die "partitions are not using whole disk space";
+
+ #- compute the checksum by building the buffer to write and call compute_crc.
+ #- set csum to 0 so compute_crc will give the right csum value.
+ $info->{csum} = 0;
+ $info->{csum} = compute_crc(pack($main_format, @$info{@$main_fields}));
+
+ syswrite F, pack($main_format, @$info{@$main_fields}), psizeof($main_format) or return 0;
+
+ common::sync();
+
+ 1;
+}
+
+sub info {
+ my ($hd) = @_;
+
+ #- take care of reduction of the number of cylinders, avoid loop of reduction!
+ unless ($hd->{geom}{totalcylinders} > $hd->{geom}{cylinders}) {
+ $hd->{geom}{totalcylinders} = $hd->{geom}{cylinders};
+ $hd->{geom}{cylinders} -= 2;
+
+ #- rebuild some constants according to number of cylinders.
+ $hd->{totalsectors} = $hd->{geom}{heads} * $hd->{geom}{sectors} * $hd->{geom}{cylinders};
+ }
+
+ #- build a default suitable partition table,
+ #- checksum will be built when writing on disk.
+ #- note third partition is ALWAYS of type Whole disk.
+ my $info = {
+ info => "DiskDrake partition table",
+ rspeed => 5400,
+ pcylcount => $hd->{geom}{totalcylinders},
+ sparecyl => 0,
+ ilfact => 1,
+ ncyl => $hd->{geom}{cylinders},
+ nacyl => $hd->{geom}{totalcylinders} - $hd->{geom}{cylinders},
+ ntrks => $hd->{geom}{heads},
+ nsect => $hd->{geom}{sectors},
+ magic => $magic,
+ };
+
+ $info;
+}
+
+sub clear_raw {
+ my ($hd) = @_;
+ my $pt = { raw => [ ({}) x $nb_primary ], info => info($hd) };
+
+ #- handle special case for partition 2 which is whole disk.
+ $pt->{raw}[2] = {
+ type => 5, #- the whole disk type.
+ flags => 0,
+ start_cylinder => 0,
+ size => $hd->{geom}{cylinders} * $hd->cylinder_size(),
+ };
+
+ $pt;
+}
+
+1;