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package partition_table::sun;
use diagnostics;
use strict;
use vars qw(@ISA);
@ISA = qw(partition_table::raw);
use common;
use partition_table::raw;
use partition_table;
use fs::type;
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, $fields2) = ([ qw(pt_type flags) ], [ qw(start_cylinder size) ]);
my ($format1, $format2) = ("xCxC", "N2");
my $magic = 0xDABE;
my $nb_primary = 8;
my $offset = 0;
sub use_pt_type { 1 }
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;
$crc ^= $_ foreach @l2b;
$crc;
}
sub read_one {
my ($hd, $sector) = @_;
my $tmp;
my $F = partition_table::raw::openit($hd) 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, $info{partitions};
foreach (0..$nb_primary-1) {
my $h = { flag => $infos_up[1 + 2 * $_],
start_cylinder => $partitions_up[2 * $_], size => $partitions_up[1 + 2 * $_] };
fs::type::set_pt_type($h, $infos_up[2 * $_]);
$h->{start} = $sector + $h->{start_cylinder} * $hd->cylinder_size;
$h->{pt_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{pt_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, pt_type, active
sub write($$$;$) {
my ($hd, $sector, $pt, $info) = @_;
# my ($csize, $wdsize) = (0, 0);
#- handle testing for writing partition table on file only!
my $F;
if ($::testing) {
my $file = "/tmp/partition_table_$hd->{device}";
open $F, ">$file" or die "error opening test file $file";
} else {
$F = partition_table::raw::openit($hd, 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 $_->{pt_type} != 5;
# $wdsize += $_->{size} if $_->{pt_type} == 5;
$_->{flags} |= 0x10 if $_->{mntpoint} eq '/';
$_->{flags} |= 0x01 if !isSwap($_);
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,
};
$info;
}
sub initialize {
my ($hd) = @_;
my $pt = { raw => [ ({}) x $nb_primary ], info => info($hd) };
#- handle special case for partition 2 which is whole disk.
$pt->{raw}[2] = {
pt_type => 5, #- the whole disk type.
flags => 0,
start_cylinder => 0,
size => $hd->{geom}{cylinders} * $hd->cylinder_size,
};
$hd->{primary} = $pt;
bless $hd, 'partition::sun';
}
1;
|
