1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
package partition_table_sun; # $Id$
use diagnostics;
use strict;
use vars qw(@ISA);
@ISA = qw(partition_table_raw);
use common qw(:common :system :file :functional);
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($$) {
my ($hd, $sector) = @_;
my $tmp;
local *F; partition_table_raw::openit($hd, *F) or die "failed to open device";
c::lseek_sector(fileno(F), $sector, $offset) or die "reading of partition in sector $sector failed";
sysread F, $tmp, psizeof($main_format) or die "error while reading partition table in sector $sector";
my %info; @info{@$main_fields} = unpack $main_format, $tmp;
#- check magic number
$info{magic} == $magic or die "bad magic number";
#- check crc, csum contains the crc so result should be 0.
compute_crc($tmp) == 0 or die "bad checksum";
@{$hd->{geom}}{qw(cylinders heads sectors)} = @info{qw(ncyl ntrks nsect)};
my @pt;
my @infos_up = unpack $format1 x $nb_primary, $info{infos};
my @partitions_up = unpack $format2 x $nb_primary, $info{partitions};
for (0..$nb_primary-1) {
my $h = { type => $infos_up[2 * $_], flag => $infos_up[1 + 2 * $_],
start_cylinder => $partitions_up[2 * $_], size => $partitions_up[1 + 2 * $_] };
$h->{start} = $sector + $h->{start_cylinder} * $hd->cylinder_size();
$h->{type} && $h->{size} or $h->{$_} = 0 foreach keys %$h;
push @pt, $h;
}
#- this code is completely broken by null char inside strings, it gets completely crazy :-)
# my @pt = mapn {
# my %h;
# @h{@$fields1} = unpack $format1, $_[0];
# @h{@$fields2} = unpack $format2, $_[1];
# $h{start} = $sector + $h{start_cylinder} * $hd->cylinder_size();
# $h{type} && $h{size} or $h{$_} = 0 foreach keys %h;
# \%h;
# } [ grep { $_ } split /(.{$size1})/o, $info{infos} ], [ grep { $_ } split /(.{$size2})/o, $info{partitions} ];
[ @pt ], \%info;
}
# write the partition table (and extended ones)
# for each entry, it uses fields: start, size, type, active
sub write($$$;$) {
my ($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;
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;
|
