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
|
package partition_table::raw; # $Id$
use diagnostics;
use strict;
use common;
use devices;
use detect_devices;
use log;
use c;
my @MBR_signatures = (
if_(arch() =~ /ppc/,
map { [ 'yaboot', 0, "PM", 0x200 * $_ + 0x10, "bootstrap\0" ] } 0 .. 61
),
[ 'empty', 0, "\0\0\0\0" ],
[ 'grub', 0, "\xEBG", 0x17d, "stage1 \0" ],
[ 'grub', 0, "\xEBH", 0x17e, "stage1 \0" ],
[ 'grub', 0, "\xEBH", 0x18a, "stage1 \0" ],
[ 'grub', 0, "\xEBH", 0x181, "GRUB \0" ],
[ 'lilo', 0x2, "LILO" ],
[ 'lilo', 0x6, "LILO" ],
[ 'grub', 0x6, "GRUB" ],
[ 'osbs', 0x2, "OSBS" ], #- http://www.prz.tu-berlin.de/~wolf/os-bs.html
[ 'pqmagic', 0xef, "PQV" ],
[ 'BootStar', 0x130, "BootStar:" ],
[ 'DocsBoot', 0x148, 'DocsBoot' ],
[ 'system_commander', 0x1ad, "SYSCMNDRSYS" ],
[ 'Be Os', 0x24, 'Boot Manager' ],
[ 'os2', 0, "\xFA\xB8\x30\x00", 0xfA, "OS/2" ],
[ 'TimO', 0, 'IBM Thinkpad hibernation partition' ],
[ 'dos', 0xa0, "\x25\x03\x4E\x02\xCD\x13" ],
[ 'dos', 0xa0, "\x00\xB4\x08\xCD\x13\x72" ], #- nt2k's
[ 'dos', 0x60, "\xBB\x00\x7C\xB8\x01\x02\x57\xCD\x13\x5F\x73\x0C\x33\xC0\xCD\x13" ], #- nt's
[ 'dos', 0x70, "\x0C\x33\xC0\xCD\x13\x4F\x75\xED\xBE\xA3" ],
[ 'freebsd', 0xC0, "\x00\x30\xE4\xCD\x16\xCD\x19\xBB\x07\x00\xB4" ],
[ 'freebsd', 0x160, "\x6A\x10\x89\xE6\x48\x80\xCC\x40\xCD\x13" ],
[ 'dummy', 0xAC, "\x0E\xB3\x07\x56\xCD\x10\x5E\xEB" ], #- caldera?
[ 'ranish', 0x100, "\x6A\x10\xB4\x42\x8B\xF4\xCD\x13\x8B\xE5\x73" ],
[ 'os2', 0x1c2, "\x0A" ],
[ 'Acronis', 0, "\xE8\x12\x01" ],
);
sub typeOfMBR($) { typeFromMagic(devices::make($_[0]), @MBR_signatures) }
sub typeOfMBR_($) { typeFromMagic($_[0], @MBR_signatures) }
sub hasExtended { 0 }
sub set_best_geometry_for_the_partition_table {}
sub cylinder_size($) {
my ($hd) = @_;
$hd->{geom}{sectors} * $hd->{geom}{heads};
}
sub first_usable_sector { 1 }
sub last_usable_sector {
my ($hd) = @_;
$hd->{totalsectors};
}
#- default method for starting a partition, only head size or twice
#- is allowed for starting a partition after a cylinder boundarie.
sub adjustStart($$) {
my ($hd, $part) = @_;
my $end = $part->{start} + $part->{size};
$part->{start} = round_up($part->{start},
$part->{start} % cylinder_size($hd) < 2 * $hd->{geom}{sectors} ?
$hd->{geom}{sectors} : cylinder_size($hd));
$part->{size} = $end - $part->{start};
$part->{size} > 0 or die "adjustStart get a too small partition to handle correctly";
}
#- adjusting end to match a cylinder boundary, two methods are used and must
#- match at the end, else something is wrong and nothing will be done on
#- partition table.
#- $end2 is computed by removing 2 (or only 1 if only 2 heads on drive) groups
#- of sectors, this is necessary to handle extended partition where logical
#- partition start after 1 (or 2 accepted) groups of sectors (typically 63).
#- $end is floating (is not on cylinder boudary) so we have to choice a good
#- candidate, $end1 or $end2 should always be good except $end1 for small
#- partition size.
sub adjustEnd($$) {
my ($hd, $part) = @_;
my $end = $part->{start} + $part->{size};
$end > $hd->{geom}{cylinders} * cylinder_size($hd) && $end <= $hd->{totalsectors} and return;
my $end1 = round_down($end, cylinder_size($hd));
my $end2 = round_up($end - ($hd->{geom}{heads} > 2 ? 2 : 1) * $hd->{geom}{sectors}, cylinder_size($hd));
$end2 <= $hd->{geom}{cylinders} * cylinder_size($hd) or die "adjustEnd go beyond end of device geometry ($end2 > $hd->{totalsectors})";
$part->{size} = ($end1 - $part->{start} > cylinder_size($hd) ? $end1 : $end2) - $part->{start};
$part->{size} > 0 or internal_error("adjustEnd get a too small partition to handle correctly");
}
sub compute_nb_cylinders {
my ($geom, $totalsectors) = @_;
$geom->{cylinders} = int $totalsectors / $geom->{heads} / $geom->{sectors};
}
sub get_geometry($) {
my ($dev) = @_;
my $g = "";
sysopen(my $F, $dev, 0) or return;
ioctl($F, c::HDIO_GETGEO(), $g) or return;
my %geom; @geom{qw(heads sectors cylinders start)} = unpack "CCSL", $g;
$geom{totalcylinders} = $geom{cylinders};
my $total;
#- $geom{cylinders} is no good (only a ushort, that means less than 2^16 => at best 512MB)
if ($total = c::total_sectors(fileno $F)) {
compute_nb_cylinders(\%geom, $total);
} else {
$total = $geom{heads} * $geom{sectors} * $geom{cylinders}
}
{ geom => \%geom, totalsectors => $total };
}
sub openit {
my ($hd, $o_mode) = @_;
my $F; sysopen($F, $hd->{file}, $o_mode || 0) && $F;
}
sub raw_removed {
my ($_hd, $_raw) = @_;
}
sub can_raw_add {
my ($hd) = @_;
$_->{size} || $_->{pt_type} or return 1 foreach @{$hd->{primary}{raw}};
0;
}
sub raw_add {
my ($_hd, $raw, $part) = @_;
foreach (@$raw) {
$_->{size} || $_->{pt_type} and next;
$_ = $part;
return;
}
die "raw_add: partition table already full";
}
sub zero_MBR {
my ($hd) = @_;
#- force the standard partition type for the architecture
my $type = arch() =~ /ia64/ ? 'gpt' : arch() eq "alpha" ? "bsd" : arch() =~ /^sparc/ ? "sun" : arch() eq "ppc" ? "mac" : "dos";
#- override standard mac type on PPC for IBM machines to dos
$type = "dos" if arch() =~ /ppc/ && detect_devices::get_mac_model() =~ /^IBM/;
require "partition_table/$type.pm";
bless $hd, "partition_table::$type";
$hd->{primary} = $hd->clear_raw;
delete $hd->{extended};
}
sub zero_MBR_and_dirty {
my ($hd) = @_;
my @parts = (partition_table::get_normal_parts($hd), if_($hd->{primary}{extended}, $hd->{primary}{extended}));
partition_table::will_tell_kernel($hd, del => $_) foreach @parts;
zero_MBR($hd);
}
#- ugly stuff needed mainly for Western Digital IDE drives
#- try writing what we've just read, yells if it fails
#- testing on last sector of head #0 (unused in 99% cases)
#-
#- return false if the device can't be written to (especially for Smartmedia)
sub test_for_bad_drives {
my ($hd) = @_;
log::l("test_for_bad_drives($hd->{file})");
my $sector = $hd->{geom}{sectors} - 1;
sub error { die "$_[0] error: $_[1]" }
my $F = openit($hd, $::testing ? 0 : 2) or error(openit($hd) ? 'write' : 'read', "can't open device");
my $seek = sub {
c::lseek_sector(fileno($F), $sector, 0) or error('read', "seeking to sector $sector failed");
};
my $tmp;
&$seek; sysread $F, $tmp, $SECTORSIZE or error('read', "can't even read ($!)");
return if $hd->{readonly} || $::testing;
&$seek; syswrite $F, $tmp or error('write', "can't even write ($!)");
my $tmp2;
&$seek; sysread $F, $tmp2, $SECTORSIZE or die "test_for_bad_drives: can't even read again ($!)";
$tmp eq $tmp2 or die
N("Something bad is happening on your drive.
A test to check the integrity of data has failed.
It means writing anything on the disk will end up with random, corrupted data.");
}
1;
|
