summaryrefslogtreecommitdiffstats
path: root/perl-install/partition_table.pm
blob: 791e8254bc4c5a3d3df0fb2fd3faa11a64efb06c (plain)
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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
package partition_table;

use diagnostics;
use strict;

use common;
use fs::type;
use partition_table::raw;
use detect_devices;
use log;

=head1 SYNOPSYS

B<partition_table> enables to read & write partitions on various partition schemes (DOS, GPT, BSD, ...)

It holds base partition table management methods, it manages
appriopriate partition_table_XXX object according to what has been read
as XXX partition table type.

=head1 Functions

=over

=cut


sub hd2minimal_part {
    my ($hd) = @_;
    { 
	rootDevice => $hd->{device}, 
	if_($hd->{usb_media_type}, is_removable => 1),
    };
}

=item description($hd)

Works for both hard disk drives and partitions ;p

=cut

sub description {
    my ($hd) = @_;
    my $win = $hd->{device_windobe};

    sprintf "%s%s (%s)", 
      $hd->{device}, 
      $win && " [$win:]", 
	join(', ', 
	     grep { $_ } 
	       formatXiB($hd->{totalsectors} || $hd->{size}, 512),
	       $hd->{info}, $hd->{mntpoint}, $hd->{fs_type});
}

=item align_to_MB_boundaries($part)

Align partition start to the next MB boundary

=cut

sub align_to_MB_boundaries {
    my ($part) = @_;

    my $end = $part->{start} + $part->{size};
    $part->{start} = round_up($part->{start}, MB(1));
    $part->{size} = $end - $part->{start};
}

sub adjustStartAndEnd {
    my ($hd, $part) = @_;

    # always align partition start to MB boundaries
    # (this accounts for devices with non-512 physical sector sizes):
    align_to_MB_boundaries($part);

    $hd->adjustStart($part);
    $hd->adjustEnd($part);
}

sub verifyNotOverlap {
    my ($a, $b) = @_;
    $a->{start} + $a->{size} <= $b->{start} || $b->{start} + $b->{size} <= $a->{start};
}
sub verifyInside {
    my ($a, $b) = @_;
    $b->{start} <= $a->{start} && $a->{start} + $a->{size} <= $b->{start} + $b->{size};
}

sub verifyParts_ {
    foreach my $i (@_) {
	foreach (@_) {
	    next if !$i || !$_ || $i == $_ || isExtended($i); #- avoid testing twice for simplicity :-)
	    if (isExtended($_)) {
		verifyNotOverlap($i, $_) or
		  log::l(sprintf("warning partition sector #$i->{start} (%s) is overlapping with extended partition!",
				 formatXiB($i->{size}, 512))); #- only warning for this one is acceptable
	    } else {
		verifyNotOverlap($i, $_) or
		  cdie sprintf("partitions sector #$i->{start} (%s) and sector #$_->{start} (%s) are overlapping!",
			       formatXiB($i->{size}, 512), formatXiB($_->{size}, 512));
	    }
	}
    }
}
sub verifyParts {
    my ($hd) = @_;
    verifyParts_(get_normal_parts($hd));
}
sub verifyPrimary {
    my ($pt) = @_;
    $_->{start} > 0 || die "partition must NOT start at sector 0" foreach @{$pt->{normal}};
    verifyParts_(@{$pt->{normal}}, $pt->{extended});
}

sub compute_device_name {
    my ($part, $hd) = @_;
    $part->{device} = _compute_device_name($hd, $part->{part_number});
}

sub _compute_device_name {
    my ($hd, $nb) = @_;
    my $prefix = $hd->{prefix} || devices::prefix_for_dev($hd->{device});
    $prefix . $nb;
}

sub assign_device_numbers {
    my ($hd) = @_;

    my $i = 1;
    my $start = 1; 
    
    {
	foreach (@{$hd->{primary}{raw}}) {
	    $_->{part_number} = $i;
	    compute_device_name($_, $hd);
	    $i++;
	}
	foreach (map { $_->{normal} } @{$hd->{extended} || []}) {
	    my $dev = _compute_device_name($hd, $i);
	    my $renumbered = $_->{device} && $dev ne $_->{device};
	    if ($renumbered) {
		require fs::mount;
		eval { fs::mount::umount_part($_) }; #- at least try to umount it
		will_tell_kernel($hd, del => $_, 'delay_del');
		push @{$hd->{partitionsRenumbered}}, [ $_->{device}, $dev ];
	    }
	    $_->{part_number} = $i;
	    compute_device_name($_, $hd);
	    if ($renumbered) {
		will_tell_kernel($hd, add => $_, 'delay_add');
	    }
	    $i++;
	}
    }

    #- try to figure what the windobe drive letter could be!
    #
    #- first verify there's at least one primary dos partition, otherwise it
    #- means it is a secondary disk and all will be false :(
    #-
    my ($c, @others) = grep { isnormal_Fat_or_NTFS($_) } @{$hd->{primary}{normal}};

    $i = ord 'C';
    $c->{device_windobe} = chr($i++) if $c;
    $_->{device_windobe} = chr($i++) foreach grep { isnormal_Fat_or_NTFS($_) } map { $_->{normal} } @{$hd->{extended}};
    $_->{device_windobe} = chr($i++) foreach @others;
}

sub remove_empty_extended {
    my ($hd) = @_;
    my $last = $hd->{primary}{extended} or return;
    @{$hd->{extended}} = grep {
	if ($_->{normal}) {
	    $last = $_;
	} else {
	    %{$last->{extended}} = $_->{extended} ? %{$_->{extended}} : ();
	}
	$_->{normal};
    } @{$hd->{extended}};
    adjust_main_extended($hd);
}

sub adjust_main_extended {
    my ($hd) = @_;

    if (!is_empty_array_ref $hd->{extended}) {
	my ($l, @l) = @{$hd->{extended}};

	# the first is a special case, must recompute its real size
	my $start = round_down($l->{normal}{start} - 1, $hd->{geom}{sectors});
	my $end = $l->{normal}{start} + $l->{normal}{size};
	my $only_linux = 1; my $has_win_lba = 0;
	foreach (map { $_->{normal} } $l, @l) {
	    $start = min($start, $_->{start});
	    $end = max($end, $_->{start} + $_->{size});
	    $only_linux &&= isTrueLocalFS($_) || isSwap($_);
	    $has_win_lba ||= $_->{pt_type} == 0xc || $_->{pt_type} == 0xe;
	}
	$l->{start} = $hd->{primary}{extended}{start} = $start;
	$l->{size} = $hd->{primary}{extended}{size} = $end - $start;
    }
    if (!@{$hd->{extended} || []} && $hd->{primary}{extended}) {
	will_tell_kernel($hd, del => $hd->{primary}{extended});
	%{$hd->{primary}{extended}} = (); #- modify the raw entry
	delete $hd->{primary}{extended};
    }
    verifyParts($hd); #- verify everything is all right
}

sub adjust_local_extended {
    my ($hd, $part) = @_;

    my $extended = find { $_->{normal} == $part } @{$hd->{extended} || []} or return;
    $extended->{size} = $part->{size} + $part->{start} - $extended->{start};

    #- must write it there too because values are not shared
    my $prev = find { $_->{extended}{start} == $extended->{start} } @{$hd->{extended} || []} or return;
    $prev->{extended}{size} = $part->{size} + $part->{start} - $prev->{extended}{start};
}

sub get_normal_parts {
    my ($hd) = @_;

    @{$hd->{primary}{normal} || []}, map { $_->{normal} } @{$hd->{extended} || []};
}

sub get_normal_parts_and_holes {
    my ($hd) = @_;
    my ($start, $last) = ($hd->first_usable_sector, $hd->last_usable_sector);

    ref($hd) or print("get_normal_parts_and_holes: bad hd" . backtrace(), "\n");

    my $minimal_hole = put_in_hash({ pt_type => 0 }, hd2minimal_part($hd));

    my @l = map {
	my $current = $start;
	$start = $_->{start} + $_->{size};
	my $hole = { start => $current, size => $_->{start} - $current, %$minimal_hole };
	put_in_hash($hole, hd2minimal_part($hd));
	$hole, $_;
    } sort { $a->{start} <=> $b->{start} } get_normal_parts($hd);

    push @l, { start => $start, size => min($last - $start, $hd->max_partition_size), %$minimal_hole } if $start < $hd->max_partition_start;
    grep { !isEmpty($_) || $_->{size} >= $hd->cylinder_size } @l;
}


=item default_type($hd)

Returns the default type of $hd ('gpt' or 'dos' depending on whether we're running under UEFI or
whether the disk size is too big for a MBR partition table.

=cut

sub default_type {
    my ($hd) = @_;

    # default to GPT on UEFI systems and disks > 2TB
    is_uefi() || $hd->{totalsectors} > 2 * 1024 * 1024 * 2048 ? 'gpt' : "dos";
}

=item initialize($hd, $o_type)

Initialize a $hd object.

Expect $hd->{file} to point to the raw device disk.

The optional $o_type parameter enables to override the detected disk type (eg: 'dos', 'gpt', ...).

=cut

sub initialize {
    my ($hd, $o_type) = @_;

    my $current = c::get_disk_type($hd->{file});
    $current = 'dos' if $current eq 'msdos';
    my $type = $o_type || $current || default_type($hd);
    $hd->{pt_table_type} = $type;

    require "partition_table/$type.pm";
    "partition_table::$type"->initialize($hd);

    delete $hd->{extended};
    if (detect_devices::is_xbox()) {
        my $part = { start => 1, size => 15632048, pt_type => 0x0bf, isFormatted => 1 };
        partition_table::dos::compute_CHS($hd, $part);
	$hd->{primary}{raw}[0] = $part;
    }

    will_tell_kernel($hd, 'init');
}

sub read_primary {
    my ($hd) = @_;

    #- it can be safely considered that the first sector is used to probe the partition table
    #- but other sectors (typically for extended partition ones) have to match this type!
	my @parttype = (
          # gpt must be tried before dos as it presents a fake compatibility mbr
	  'gpt', 'lvm', 'dmcrypt', 'dos', 'bsd', 'sun', 'mac',
	);
	foreach ('empty', @parttype, 'unknown') {
	    /unknown/ and die "unknown partition table format on disk " . $hd->{file};

		# perl_checker: require partition_table::bsd
		# perl_checker: require partition_table::dos
		# perl_checker: require partition_table::empty
		# perl_checker: require partition_table::dmcrypt
		# perl_checker: require partition_table::lvm
		# perl_checker: require partition_table::gpt
		# perl_checker: require partition_table::mac
		# perl_checker: require partition_table::sun
		require "partition_table/$_.pm";
		bless $hd, "partition_table::$_";
	        if ($hd->read_primary) {
		    log::l("found a $_ partition table on $hd->{file} at sector 0");
		    $hd->{pt_table_type} = $_ if $_ ne 'empty';
		    return 1;
		}
	}
    0;
}


=item read($hd)

Read the partition table of $hd.

=cut

sub read {
    my ($hd) = @_;
    read_primary($hd) or return 0;
    eval {
	my $need_removing_empty_extended;
	if ($hd->{primary}{extended}) {
	    read_extended($hd, $hd->{primary}{extended}, \$need_removing_empty_extended) or return 0;
	}
	if ($need_removing_empty_extended) {
	    #- special case when hda5 is empty, it must be skipped
	    #- (windows XP generates such partition tables)
	    remove_empty_extended($hd); #- includes adjust_main_extended
	}
	
    }; 
    die "extended partition: $@" if $@;

    assign_device_numbers($hd);
    remove_empty_extended($hd);

    $hd->set_best_geometry_for_the_partition_table;
    1;
}

sub read_extended {
    my ($hd, $extended, $need_removing_empty_extended) = @_;

    my $pt = do {
	my ($pt, $info) = $hd->read_one($extended->{start}) or return 0;
	partition_table::raw::pt_info_to_primary($hd, $pt, $info);
    };
    $pt = { %$extended, %$pt };

    push @{$hd->{extended}}, $pt;
    @{$hd->{extended}} > 100 and die "oops, seems like we're looping here :(  (or you have more than 100 extended partitions!)";

    if (@{$pt->{normal}} == 0) {
	$$need_removing_empty_extended = 1;
	delete $pt->{normal};
	print "need_removing_empty_extended\n";
    } elsif (@{$pt->{normal}} > 1) {
	die "more than one normal partition in extended partition";
    } else {
	$pt->{normal} = $pt->{normal}[0];
	#- in case of extended partitions, the start sector is local to the partition or to the first extended_part!
	$pt->{normal}{start} += $pt->{start};

	#- the following verification can broke an existing partition table that is
	#- correctly read by fdisk or cfdisk. maybe the extended partition can be
	#- recomputed to get correct size.
	if (!verifyInside($pt->{normal}, $extended)) {
	    $extended->{size} = $pt->{normal}{start} + $pt->{normal}{size};
	    verifyInside($pt->{normal}, $extended) or die "partition $pt->{normal}{device} is not inside its extended partition";
	}
    }

    if ($pt->{extended}) {
	$pt->{extended}{start} += $hd->{primary}{extended}{start};
	return read_extended($hd, $pt->{extended}, $need_removing_empty_extended);
    } else {
	1;
    }
}

sub will_tell_kernel {
    my ($hd, $action, $o_part, $o_delay) = @_;

    if ($action eq 'resize') {
	will_tell_kernel($hd, del => $o_part);
	will_tell_kernel($hd, add => $o_part);
    } elsif ($action eq 'init') {
	# We will tell the kernel to reread the partition table, so no need to remember
	# previous changes.
	delete $hd->{will_tell_kernel};
	delete $hd->{will_tell_kerneldelay_add};
	delete $hd->{will_tell_kerneldelay_del};
	push @{$hd->{will_tell_kernel} ||= []}, [ $action, () ];
    } else {
	my $part_number;
	if ($o_part) {
	    ($part_number) = $o_part->{device} =~ /(\d+)$/ or
	      #- do not die, it occurs when we zero_MBR_and_dirty a raw_lvm_PV
	      log::l("ERROR: will_tell_kernel bad device " . description($o_part)), return;
	}

	my @para =
	  $action eq 'add' ? ($part_number, $o_part->{start}, $o_part->{size}) :
	  $action eq 'del' ? $part_number :
	  internal_error("unknown action $action");

	push @{$hd->{'will_tell_kernel' . ($o_delay || '')} ||= []}, [ $action, @para ];
    }
    $hd->{isDirty} = 1;
}

sub will_tell_kernel_delayed {
    my ($hd) = @_;
    foreach my $delay ('delay_del', 'delay_add') {
	my $l = delete $hd->{"will_tell_kernel$delay"} or next;
	push @{$hd->{will_tell_kernel} ||= []}, @$l;
    }
}

sub tell_kernel {
    my ($hd, $tell_kernel) = @_;

    my $F = partition_table::raw::openit($hd);

    my $force_reboot = $hd->{rebootNeeded} || any { $_->[0] eq 'init' } @$tell_kernel;
    if (!$force_reboot) {
	foreach (@$tell_kernel) {
	    my ($action, $part_number, $o_start, $o_size) = @$_;
	    
	    if ($action eq 'add') {
		$force_reboot ||= !c::add_partition(fileno($F), $part_number, $o_start, $o_size);
	    } elsif ($action eq 'del') {
		$force_reboot ||= !c::del_partition(fileno($F), $part_number);
	    }
	    log::l("tell kernel $action ($hd->{device} $part_number $o_start $o_size) force_reboot=$force_reboot rebootNeeded=$hd->{rebootNeeded}");
	}
    }

    if ($force_reboot) {
	# FIXME Handle LVM/dmcrypt/RAID
	my @magic_parts = grep { $_->{isMounted} && $_->{real_mntpoint} } get_normal_parts($hd);
	foreach (@magic_parts) {
	    syscall_('umount', $_->{real_mntpoint}) or log::l(N("error unmounting %s: %s", $_->{real_mntpoint}, $!));
	}
	$hd->{rebootNeeded} = !c::tell_kernel_to_reread_partition_table($hd->{file});
	log::l("tell kernel force_reboot ($hd->{device}), rebootNeeded=$hd->{rebootNeeded}");

	foreach (@magic_parts) {
	    syscall_('mount', $_->{real_mntpoint}, $_->{fs_type}, c::MS_MGC_VAL()) or log::l(N("mount failed: ") . $!);
	}
    }
}

=item write($hd)

Write the partition table

The partition_table_XXX object is expected to provide three functions to
support writing the partition table:

=over

=item * start_write()

start_write() is called once at the beginning to initiate the write operation,

=item * write()

write() is then called one or more times (depending on whether there are any
extended partitions),

=item * end_write().

and end_write() is called once to complete the write operation.

=back

For partition table types that support extended partitions (e.g.  DOS),
start_write() is expected to return a file handle to the raw device which is
then passed to write() and end_write(), allowing the entire table to be written
before closing the raw device. For partition table types that don't support
extended partitions, this is optional, and the entire write operation can be
performed in the single call to write().

=cut

sub write {
    my ($hd) = @_;
    $hd->{isDirty} or return;
    $hd->{readonly} and internal_error("a read-only partition table should not be dirty ($hd->{device})!");

    #- set first primary partition active if no primary partitions are marked as active.
    if (my @l = @{$hd->{primary}{raw}}) {
	foreach (@l) { 
	    $_->{local_start} = $_->{start}; 
	    $_->{active} ||= 0;
	}
	$l[0]{active} = 0x80 if !any { $_->{active} } @l;
    }

    #- last chance for verification, this make sure if an error is detected,
    #- it will never be writed back on partition table.
    verifyParts($hd);

    my $handle = $hd->start_write();
    $hd->write($handle, 0, $hd->{primary}{raw}, $hd->{primary}{info}) or die "writing of partition table failed";
    #- should be fixed but a extended exist with no real extended partition, that blanks mbr!
	foreach (@{$hd->{extended}}) {
	    # in case of extended partitions, the start sector must be local to the partition
	    $_->{normal}{local_start} = $_->{normal}{start} - $_->{start};
	    $_->{extended} and $_->{extended}{local_start} = $_->{extended}{start} - $hd->{primary}{extended}{start};

	    $hd->write($handle, $_->{start}, $_->{raw}) or die "writing of partition table failed";
	}
    $hd->end_write($handle);
    $hd->{isDirty} = 0;

    if (my $tell_kernel = delete $hd->{will_tell_kernel}) {
	if (fs::type::is_dmraid($hd)) {
	    fs::dmraid::call_dmraid('-an');
	    fs::dmraid::call_dmraid('-ay');
	} else {
	    tell_kernel($hd, $tell_kernel) if $hd->need_to_tell_kernel();
	}
    }
    # get major/minor again after writing the partition table so that we got them for dynamic devices
    # (eg: for SCSI like devices with kernel-2.6.28+):
    fs::get_major_minor([ get_normal_parts($hd) ]);
}

sub active {
    my ($hd, $part) = @_;

    $_->{active} = 0 foreach @{$hd->{primary}{normal}};
    $part->{active} = 0x80;
    $hd->{isDirty} = 1;
}

=item remove($hd, $part)

Remove a normal partition from hard disk drive $hd

=cut

sub remove {
    my ($hd, $part) = @_;
    my $i;

    #- first search it in the primary partitions
    $i = 0; foreach (@{$hd->{primary}{normal}}) {
	if ($_ eq $part) {
	    will_tell_kernel($hd, del => $_);

	    splice(@{$hd->{primary}{normal}}, $i, 1);
	    %$_ = (); #- blank it

	    $hd->raw_removed($hd->{primary}{raw});
	    return 1;
	}
	$i++;
    }

    my ($first, $second, $third) = map { $_->{normal} } @{$hd->{extended} || []};
    if ($third && $first eq $part) {
	die "Cannot handle removing hda5 when hda6 is not the second partition" if $second->{start} > $third->{start};
    }      

    #- otherwise search it in extended partitions
    foreach (@{$hd->{extended} || []}) {
	$_->{normal} eq $part or next;

	delete $_->{normal}; #- remove it
	remove_empty_extended($hd);
	assign_device_numbers($hd);

	will_tell_kernel($hd, del => $part);
	#- schedule renumbering after deleting the partition
	will_tell_kernel_delayed($hd);
	return 1;
    }
    0;
}

=item add_primary($hd, $part)

Create of partition at starting at `start', of size `size' and of type `pt_type'

=cut

sub add_primary {
    my ($hd, $part) = @_;

    {
	local $hd->{primary}{normal}; #- save it to fake an addition of $part, that way add_primary do not modify $hd if it fails
	push @{$hd->{primary}{normal}}, $part;
	adjust_main_extended($hd); #- verify
	$hd->raw_add($hd->{primary}{raw}, $part);
    }
    push @{$hd->{primary}{normal}}, $part; #- really do it
}

sub add_extended {
    my ($hd, $part, $extended_type) = @_;
    $extended_type =~ s/Extended_?//;

    my $e = $hd->{primary}{extended};

    if ($e && !verifyInside($part, $e)) {
	#-die "sorry, cannot add outside the main extended partition" unless $::unsafe;
	my $end = $e->{start} + $e->{size};
	my $start = min($e->{start}, $part->{start});
	$end = max($end, $part->{start} + $part->{size}) - $start;

	{ #- faking a resizing of the main extended partition to test for problems
	    local $e->{start} = $start;
	    local $e->{size} = $end - $start;
	    eval { verifyPrimary($hd->{primary}) };
	    $@ and die
N("You have a hole in your partition table but I cannot use it.
The only solution is to move your primary partitions to have the hole next to the extended partitions.");
	}
    }

    if ($e && $part->{start} < $e->{start}) {
	my $l = first(@{$hd->{extended}});

	#- the first is a special case, must recompute its real size
	$l->{start} = round_down($l->{normal}{start} - 1, $hd->cylinder_size);
	$l->{size} = $l->{normal}{start} + $l->{normal}{size} - $l->{start};
	my $ext = { %$l };
	unshift @{$hd->{extended}}, { pt_type => 5, raw => [ $part, $ext, {}, {} ], normal => $part, extended => $ext };
	#- size will be autocalculated :)
    } else {
	my ($ext, $ext_size) = is_empty_array_ref($hd->{extended}) ?
	  ($hd->{primary}, -1) : #- -1 size will be computed by adjust_main_extended
	  (top(@{$hd->{extended}}), $part->{size});
	my %ext = (pt_type => $extended_type || 5, start => $part->{start}, size => $ext_size);

	$hd->raw_add($ext->{raw}, \%ext);
	$ext->{extended} = \%ext;
	push @{$hd->{extended}}, { %ext, raw => [ $part, {}, {}, {} ], normal => $part };
    }
    $part->{start}++; $part->{size}--; #- let it start after the extended partition sector
    adjustStartAndEnd($hd, $part);

    adjust_main_extended($hd);
}

sub add {
    my ($hd, $part, $b_primaryOrExtended, $b_forceNoAdjust) = @_;

    get_normal_parts($hd) >= ($hd->{device} =~ /^rd/ ? 7 : $hd->{device} =~ /^(ida|cciss)/ ? 15 : 63) and cdie "maximum number of partitions handled by linux reached";

    set_isFormatted($part, 0);
    put_in_hash($part, hd2minimal_part($hd));
    $part->{start} ||= 1; #- starting at sector 0 is not allowed
    adjustStartAndEnd($hd, $part) unless $b_forceNoAdjust;

    my $nb_primaries = $hd->{device} =~ /^rd/ ? 3 : 1;

    if ($b_primaryOrExtended eq 'Primary' ||
	$b_primaryOrExtended !~ /Extended/ && @{$hd->{primary}{normal} || []} < $nb_primaries) {
	eval { add_primary($hd, $part) };
	goto success if !$@;
    }
    if ($hd->hasExtended) {
	eval { add_extended($hd, $part, $b_primaryOrExtended) };
	goto success if !$@;
    }
    {
	add_primary($hd, $part);
    }
  success:
    assign_device_numbers($hd);
    #- schedule renumbering before adding the partition
    will_tell_kernel_delayed($hd);
    will_tell_kernel($hd, add => $part);
}

=item next($hd, $part)

Search for the next partition

=cut

sub next {
    my ($hd, $part) = @_;

    first(
	  sort { $a->{start} <=> $b->{start} }
	  grep { $_->{start} >= $part->{start} + $part->{size} }
	  get_normal_parts($hd)
	 );
}
sub next_start {
    my ($hd, $part) = @_;
    my $next = &next($hd, $part);
    $next ? $next->{start} : $hd->last_usable_sector;
}

=back

=cut

1;