package partition_table; # $Id$
use diagnostics;
use strict;
use common;
use fs::type;
use partition_table::raw;
use detect_devices;
use log;
our @fields2save = qw(primary extended totalsectors isDirty will_tell_kernel);
sub hd2minimal_part {
my ($hd) = @_;
{
rootDevice => $hd->{device},
if_($hd->{usb_media_type}, is_removable => 1),
};
}
#- works for both hard drives and partitions ;p
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}, $hd->{fs_type});
}
sub isPrimary {
my ($part, $hd) = @_;
foreach (@{$hd->{primary}{raw}}) { $part eq $_ and return 1 }
0;
}
sub adjustStartAndEnd {
my ($hd, $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 == $_ || isWholedisk($i) || isExtended($i); #- avoid testing twice for simplicity :-)
if (isWholedisk($_)) {
verifyInside($i, $_) or
cdie sprintf("partition sector #$i->{start} (%s) is not inside whole disk (%s)!",
formatXiB($i->{size}, 512), formatXiB($_->{size}, 512));
} elsif (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) = @_;
$_->{start} > 0 || arch() =~ /^sparc/ || die "partition must NOT start at sector 0" foreach @{$pt->{normal}};
verifyParts_(@{$pt->{normal}}, $pt->{extended});
}
sub compute_device_name {
my ($part, $hd) = @_;
$part->{device} = $hd->{prefix} . $part->{part_number};
$part->{devfs_device} = $hd->{devfs_prefix} . '/part' . $part->{part_number};
}
sub assign_device_numbers {
my ($hd) = @_;
my $i = 1;
my $start = 1;
#- on PPC we need to assign device numbers to the holes too - big FUN!
#- not if it's an IBM machine using a DOS partition table though
if (arch() =~ /ppc/ && detect_devices::get_mac_model() !~ /^IBM/) {
#- first sort the normal parts
$hd->{primary}{normal} = [ sort { $a->{start} <=> $b->{start} } @{$hd->{primary}{normal}} ];
#- now loop through them, assigning partition numbers - reserve one for the holes
foreach (@{$hd->{primary}{normal}}) {
if ($_->{start} > $start) {
log::l("PPC: found a hole on $hd->{prefix} before $_->{start}, skipping device...");
$i++;
}
$_->{part_number} = $i;
compute_device_name($_, $hd);
$start = $_->{start} + $_->{size};
$i++;
}
} else {
foreach (@{$hd->{primary}{raw}}) {
$_->{part_number} = $i;
compute_device_name($_, $hd);
$i++;
}
foreach (map { $_->{normal} } @{$hd->{extended} || []}) {
my $dev = $hd->{prefix} . $i;
my $renumbered = $_->{device} && $dev ne $_->{device};
if ($renumbered) {
require fs;
eval { fs::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 { isFat_or_NTFS($_) } @{$hd->{primary}{normal}};
$i = ord 'C';
$c->{device_windobe} = chr($i++) if $c;
$_->{device_windobe} = chr($i++) foreach grep { isFat_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} <=> $b->{start} } grep { !isWholedisk($_) } get_normal_parts($hd);
push @l, { start => $start, size => $last - $start, %$minimal_hole };
grep { !isEmpty($_) || $_->{size} >= $hd->cylinder_size } @l;
}
sub read_one($$) {
my ($hd, $sector) = @_;
my ($pt, $info);
#- 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!
if (!$sector) {
my @parttype = (
if_(arch() =~ /^ia64/, 'gpt'),
arch() =~ /^sparc/ ? ('sun', 'bsd') : ('dos', 'bsd', 'sun', 'mac'),
);
foreach ('empty', @parttype, 'unknown') {
/unknown/ and die "unknown partition table format on disk " . $hd->{file};
eval {
# perl_checker: require partition_table::bsd
# perl_checker: require partition_table::dos
# perl_checker: require partition_table::empty
# 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::$_";
($pt, $info) = $hd->read($sector);
log::l("found a $_ partition table on $hd->{file} at sector $sector");
};
$@ or last;
}
} else {
#- keep current blessed object for that, this means it is neccessary to read sector 0 before.
($pt, $info) = $hd->read($sector);
}
my @extended = $hd->hasExtended ? grep { isExtended($_) } @$pt : ();
my @normal = grep { $_->{size} && !isEmpty($_) && !isExtended($_) } @$pt;
my $nb_special_empty = int(grep { $_->{size} && isEmpty($_) } @$pt);
@extended > 1 and die "more than one extended partition";
put_in_hash($_, hd2minimal_part($hd)) foreach @normal, @extended;
{ raw => $pt, extended => $extended[0], normal => \@normal, info => $info, nb_special_empty => $nb_special_empty };
}
sub read {
my ($hd) = @_;
my $pt = read_one($hd, 0) or return 0;
$hd->{primary} = $pt;
undef $hd->{extended};
verifyPrimary($pt);
eval {
my $need_removing_empty_extended;
if ($pt->{extended}) {
read_extended($hd, $pt->{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 = read_one($hd, $extended->{start}) or return 0;
$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);
} 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 'force_reboot' ? () :
$action eq 'add' ? ($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 || '')} ||= []}, [ $action, @para ];
}
if (!$o_delay) {
foreach my $delay ('delay_del', 'delay_add') {
my $l = delete $hd->{"will_tell_kernel$delay"} or next;
push @{$hd->{will_tell_kernel} ||= []}, @$l;
}
}
$hd->{isDirty} = 1;
}
sub tell_kernel {
my ($hd, $tell_kernel) = @_;
my $F = partition_table::raw::openit($hd);
my $force_reboot = any { $_->[0] eq 'force_reboot' } @$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 $o_size), rebootNeeded is now " . bool2text($hd->{rebootNeeded}));
}
}
if ($force_reboot) {
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}, $!));
}
$hd->{rebootNeeded} = !ioctl($F, c::BLKRRPART(), 0);
log::l("tell kernel force_reboot ($hd->{device}), rebootNeeded is now $hd->{rebootNeeded}.");
foreach (@magic_parts) {
syscall_('mount', $_->{real_mntpoint}, $_->{fs_type}, c::MS_MGC_VAL()) or log::l(N("mount failed: ") . $!);
}
}
}
# write the partition table
sub write {
my ($hd) = @_;
$hd->{isDirty} or return;
$hd->{readonly} and die "a read-only partition table should not be dirty!";
#- set first primary partition active if no primary partitions are marked as active.
if (my @l = @{$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);
$hd->write(0, $hd->{primary}{raw}, $hd->{primary}{info}) or die "writing of partition table failed";
#- should be fixed but a extended exist with no real extended partition, that blanks mbr!
if (arch() !~ /^sparc/) {
foreach (@{$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};
$hd->write($_->{start}, $_->{raw}) or die "writing of partition table failed";
}
}
$hd->{isDirty} = 0;
$hd->{hasBeenDirty} = 1; #- used in undo (to know if undo should believe isDirty or not)
if (my $tell_kernel = delete $hd->{will_tell_kernel}) {
tell_kernel($hd, $tell_kernel);
}
}
sub active {
my ($hd, $part) = @_;
$_->{active} = 0 foreach @{$hd->{primary}{normal}};
$part->{active} = 0x80;
$hd->{isDirty} = 1;
}
# remove a normal partition from hard drive hd
sub remove {
my ($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 "Can not 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 => $part);
return 1;
}
0;
}
# create of partition at starting at `start', of size `size' and of type `pt_type' (nice comment, uh?)
sub add_primary {
my ($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}}, $part; #- really do it
}
sub add_extended {
arch() =~ /^sparc|ppc/ and die N("Extended partition not supported on this platform");
my ($hd, $part, $extended_type) = @_;
$extended_type =~ s/Extended_?//;
my $e = $hd->{primary}{extended};
if ($e && !verifyInside($part, $e)) {
#-die "sorry, can not 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}) };
$@ and die
N("You have a hole in your partition table but I can not use it.
The only solution is to move your primary partitions to have the hole next to the extended partitions.");
}
}
if ($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 : $hd->{device} =~ /^(sd|ida|cciss|ataraid)/ ? 15 : 63) and cdie "maximum number of partitions handled by linux reached";
set_isFormatted($part, 0);
put_in_hash($part, hd2minimal_part($hd));
$part->{start} ||= 1 if arch() !~ /^sparc/; #- starting at sector 0 is not allowed
adjustStartAndEnd($hd, $part) unless $b_forceNoAdjust;
my $nb_primaries = $hd->{device} =~ /^rd/ ? 3 : 1;
if (arch() =~ /^sparc|ppc/ ||
$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);
will_tell_kernel($hd, add => $part);
}
# search for the next partition
sub next {
my ($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} : $hd->{totalsectors};
}
sub load {
my ($hd, $file, $b_force) = @_;
my $F;
if (ref $file) {
$F = $file;
} else {
open($F, $file) or die N("Error reading file %s", $file);
}
my $h;
{
local $/ = "\0";
eval <$F>;
}
$@ and die N("Restoring from file %s failed: %s", $file, $@);
ref($h) eq 'ARRAY' or die N("Bad backup file");
my %h; @h{@fields2save} = @$h;
$h{totalsectors} == $hd->{totalsectors} or $b_force or cdie "bad totalsectors";
#- unsure we do not modify totalsectors
local $hd->{totalsectors};
@$hd{@fields2save} = @$h;
delete @$_{qw(isMounted isFormatted notFormatted toFormat toFormatUnsure)} foreach get_normal_parts($hd);
will_tell_kernel($hd, 'force_reboot'); #- just like undo, do not force write_partitions so that user can see the new partition table but can still discard it
}
sub save {
my ($hd, $file) = @_;
my @h = @$hd{@fields2save};
require Data::Dumper;
eval { output($file, Data::Dumper->Dump([\@h], ['$h']), "\0") }
or die N("Error writing to file %s", $file);
}
1;
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