g Move 2: partition table: hierarchy

1 files changed, 201 insertions, 0 deletions

diff --git a/perl-install/partition_table/sun.pm b/perl-install/partition_table/sun.pm
new file mode 100644
index 000000000..6944130dc
--- /dev/null
+++ b/perl-install/partition_table/sun.pm
@@ -0,0 +1,201 @@
+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;