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
|
package partition_table_raw; # $Id$
use diagnostics;
use strict;
use common;
use devices;
use log;
use c;
my @MBR_signatures = (
[ '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" ],
[ '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' ],
[ '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, "\xA" ],
);
sub typeOfMBR($) { typeFromMagic(devices::make($_[0]), @MBR_signatures) }
sub typeOfMBR_($) { typeFromMagic($_[0], @MBR_signatures) }
sub hasExtended { 0 }
sub cylinder_size($) {
my ($hd) = @_;
$hd->{geom}{sectors} * $hd->{geom}{heads};
}
#- 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};
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};
$part->{size} > 0 or die "adjustEnd get a too small partition to handle correctly";
}
sub get_geometry($) {
my ($dev) = @_;
my $g = "";
local *F; sysopen 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};
#- $geom{cylinders} is no good (only a ushort, that means less than 2^16 => at best 512MB)
if (my $total = c::total_sectors(fileno F)) {
$geom{cylinders} = int $total / $geom{heads} / $geom{sectors};
}
{ geom => \%geom, totalsectors => $geom{heads} * $geom{sectors} * $geom{cylinders} };
}
#- works for both hard drives and partitions ;p
sub description {
my ($hd) = @_;
my $win = $hd->{device_windobe};
sprintf "%s%s (%s%s)",
$hd->{device},
$win && " [$win:]",
formatXiB($hd->{totalsectors} || $hd->{size}, 512),
$hd->{info} && ", $hd->{info}";
}
sub openit($$;$) { sysopen $_[1], $_[0]{file}, $_[2] || 0; }
# cause kernel to re-read partition table
sub kernel_read($) {
my ($hd) = @_;
common::sync();
local *F; openit($hd, *F) or return 0;
common::sync(); sleep(1);
$hd->{rebootNeeded} = !ioctl(F, c::BLKRRPART(), 0);
common::sync();
close F;
common::sync(); sleep(1);
}
sub zero_MBR {
my ($hd) = @_;
#- force the standard partition type for the architecture
my $type = arch() eq "alpha" ? "bsd" : arch() =~ /^sparc/ ? "sun" : arch() eq "ppc" ? "mac" : "dos";
require("partition_table_$type.pm");
bless $hd, "partition_table_$type";
$hd->{primary} = $hd->clear_raw();
delete $hd->{extended};
}
sub zero_MBR_and_dirty {
my ($hd) = @_;
zero_MBR($hd);
$hd->{isDirty} = $hd->{needKernelReread} = 1;
}
#- ugly stuff needed mainly for Western Digital IDE drives
#- try writing what we've just read, yells if it fails
#- testing on last sector of head #0 (unused in 99% cases)
sub test_for_bad_drives {
my ($hd) = @_;
log::l("test_for_bad_drives($hd->{file})");
my $sector = $hd->{geom}{sectors} - 1;
local *F; openit($hd, *F, 2) or die "error opening device $hd->{device} for writing";
my $seek = sub {
c::lseek_sector(fileno(F), $sector, 0) or die "seeking to sector $sector failed";
};
my $tmp;
&$seek; sysread F, $tmp, $SECTORSIZE or die "test_for_bad_drives: can't even read ($!)";
&$seek; syswrite F, $tmp or die "test_for_bad_drives: can't even write ($!)";
my $tmp2;
&$seek; sysread F, $tmp2, $SECTORSIZE or die "test_for_bad_drives: can't even read again ($!)";
$tmp eq $tmp2 or die
_("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 trash");
}
1;
|
