g Move 2: partition table: hierarchy

1 files changed, 147 insertions, 0 deletions

diff --git a/perl-install/partition_table/bsd.pm b/perl-install/partition_table/bsd.pm
new file mode 100644
index 000000000..431d17f1f
--- /dev/null
+++ b/perl-install/partition_table/bsd.pm
@@ -0,0 +1,147 @@
+package partition_table::bsd; # $Id$
+
+use diagnostics;
+use strict;
+use vars qw(@ISA);
+
+@ISA = qw(partition_table::raw);
+
+use common;
+use partition_table::raw;
+use partition_table;
+use c;
+
+#- very bad and rough handling :(
+my %typeToDos = (
+  8 => 0x83,
+  1 => 0x82,
+);
+my %typeFromDos = reverse %typeToDos;
+
+my ($main_format, $main_fields) = list2kv(
+  I   => 'magic',
+  S   => 'type',
+  S   => 'subtype',
+  a16 => 'typename',
+  a16 => 'packname',
+  I   => 'secsize',
+  I   => 'nsectors',
+  I   => 'ntracks',
+  I   => 'ncylinders',
+  I   => 'secpercyl',
+  I   => 'secprtunit',
+  S   => 'sparespertrack',
+  S   => 'sparespercyl',
+  I   => 'acylinders',
+  S   => 'rpm',
+  S   => 'interleave',
+  S   => 'trackskew',
+  S   => 'cylskew',
+  I   => 'headswitch',
+  I   => 'trkseek',
+  I   => 'flags',
+  a20 => 'drivedata',
+  a20 => 'spare',
+  I   => 'magic2',
+  S   => 'checksum',
+  S   => 'npartitions',
+  I   => 'bbsize',
+  I   => 'sbsize',
+  a128=> 'partitions',
+  a236=> 'blank',
+);
+$main_format = join '', @$main_format;
+
+my @fields = qw(size start fsize type frag cpg);
+my $format = "I I I C C S";
+my $magic = 0x82564557;
+my $nb_primary = 8;
+my $offset = 0x40;
+
+sub read($$) {
+    my ($hd, $sector) = @_;
+    my $tmp;
+
+    local *F; partition_table::raw::openit($hd, *F) or die "failed to open device";
+    c::lseek_sector(fileno(F), $sector, $offset) or die "reading of partition in sector $sector failed";
+
+    sysread F, $tmp, psizeof($main_format) or die "error while reading partition table in sector $sector";
+    my %info; @info{@$main_fields} = unpack $main_format, $tmp;
+
+    #- TODO verify checksum
+
+    my $size = psizeof($format);
+    my @pt = map {
+	my %h; @h{@fields} = unpack $format, $_;
+	$h{type} = $typeToDos{$h{type}} || $h{type};
+	\%h;
+    } $info{partitions} =~ /(.{$size})/g;
+
+    #- check magic number
+    $info{magic}  == $magic or die "bad magic number on disk $hd->{device}";
+    $info{magic2} == $magic or die "bad magic number on disk $hd->{device}";
+
+    [ @pt ], \%info;
+}
+
+# write the partition table (and extended ones)
+# for each entry, it uses fields: start, size, type, active
+sub write($$$;$) {
+    my ($hd, $sector, $pt, $info) = @_;
+
+    #- handle testing for writing partition table on file only!
+    local *F;
+    if ($::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;
+    }
+
+    #- TODO compute checksum
+
+    $info->{npartitions} = $nb_primary; #- is it ok?
+
+    @$pt == $nb_primary or die "partition table does not have $nb_primary entries";
+    $info->{partitions} = join '', map {
+	local $_->{type} = $typeFromDos{$_->{type}} || $_->{type};
+	pack $format, @$_{@fields};
+    } @$pt;
+
+    syswrite F, pack($main_format, @$info{@$main_fields}), psizeof($main_format) or return 0;
+    1;
+}
+
+sub info {
+    my ($hd) = @_;
+    my $dtype_scsi  = 4; #- taken from fdisk, removed unused one,
+    my $dtype_ST506 = 6; #- see fdisk for more
+
+    {
+      magic => $magic,
+      magic2 => $magic,
+      dtype => $hd->{device} =~ /^sd/ ? $dtype_scsi : $dtype_ST506,
+      secsize => $common::SECTORSIZE,
+      ncylinders => $hd->{geom}{cylinders},
+      secpercyl => $hd->cylinder_size(),
+      secprtunit => $hd->{geom}{totalsectors},
+      rpm => 3600,
+      interleave => 1,
+      trackskew => 0,
+      cylskew => 0,
+      headswitch => 0,
+      trkseek => 0,
+      bbsize => 8192, #- size of boot area, with label
+      sbsize => 8192, #- max size of fs superblock
+    };
+}
+
+sub clear_raw {
+    my ($hd) = @_;
+    { raw => [ ({}) x $nb_primary ], info => info($hd) };
+}
+
+sub first_usable_sector { 2048 }
+
+1;