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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/bsd.pm
parent6ed6b5341362f87e3c70420f206a33f71c72a3de (diff)
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g Move 2: partition table: hierarchy
Diffstat (limited to 'perl-install/partition_table/bsd.pm')
-rw-r--r--perl-install/partition_table/bsd.pm147
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;