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package resize_fat::main; # $Id$
# This is mainly a perl rewrite of the work of Andrew Clausen (libresize)
use diagnostics;
use strict;
use log;
use common;
use MDK::Common::System;
use resize_fat::boot_sector;
use resize_fat::info_sector;
use resize_fat::directory;
use resize_fat::io;
use resize_fat::fat;
use resize_fat::any;
1;
#- - reads in the boot sector/partition info., and tries to make some sense of it
sub new($$$) {
my ($type, $device, $fs_name) = @_;
my $fs = { device => $device, fs_name => $fs_name };
eval {
resize_fat::io::open($fs);
resize_fat::boot_sector::read($fs);
$resize_fat::isFAT32 and eval { resize_fat::info_sector::read($fs) };
resize_fat::fat::read($fs);
resize_fat::any::flag_clusters($fs);
};
if ($@) {
close $fs->{fd};
die;
}
bless $fs, $type;
}
sub DESTROY {
my ($fs) = @_;
close $fs->{fd};
resize_fat::c_rewritten::free_all();
}
#- copy all clusters >= <start_cluster> to a new place on the partition, less
#- than <start_cluster>. Only copies files, not directories.
#- (use of buffer needed because the seeks slow like hell the hard drive)
sub copy_clusters {
my ($fs, $cluster) = @_;
my @buffer;
my $flush = sub {
while (@buffer) {
my $cluster = shift @buffer;
resize_fat::io::write_cluster($fs, $cluster, shift @buffer);
}
};
for (; $cluster < $fs->{nb_clusters} + 2; $cluster++) {
resize_fat::c_rewritten::flag($cluster) == $resize_fat::any::FILE or next;
push @buffer,
resize_fat::c_rewritten::fat_remap($cluster),
resize_fat::io::read_cluster($fs, $cluster);
@buffer > 50 and &$flush();
}
&$flush();
}
#- Constructs the new directory tree to match the new file locations.
sub construct_dir_tree {
my ($fs) = @_;
if ($resize_fat::isFAT32) {
#- fat32's root must remain in the first 64k clusters
#- so do not set it as DIRECTORY, it will be specially handled
resize_fat::c_rewritten::set_flag($fs->{fat32_root_dir_cluster}, $resize_fat::any::FREE);
}
for (my $cluster = 2; $cluster < $fs->{nb_clusters} + 2; $cluster++) {
resize_fat::c_rewritten::flag($cluster) == $resize_fat::any::DIRECTORY or next;
resize_fat::io::write_cluster($fs,
resize_fat::c_rewritten::fat_remap($cluster),
resize_fat::directory::remap($fs, resize_fat::io::read_cluster($fs, $cluster)));
}
MDK::Common::System::sync();
#- until now, only free clusters have been written. it's a null operation if we stop here.
#- it means no corruption :)
#
#- now we must be as fast as possible!
#- remapping non movable root directory
if ($resize_fat::isFAT32) {
my $cluster = $fs->{fat32_root_dir_cluster};
resize_fat::io::write_cluster($fs,
resize_fat::c_rewritten::fat_remap($cluster),
resize_fat::directory::remap($fs, resize_fat::io::read_cluster($fs, $cluster)));
} else {
resize_fat::io::write($fs, $fs->{root_dir_offset}, $fs->{root_dir_size},
resize_fat::directory::remap($fs, resize_fat::io::read($fs, $fs->{root_dir_offset}, $fs->{root_dir_size})));
}
}
sub min_size($) { &resize_fat::any::min_size }
sub max_size($) { &resize_fat::any::max_size }
sub used_size($) { &resize_fat::any::used_size }
#- resize
#- - size is in sectors
#- - checks boundaries before starting
#- - copies all data beyond new_cluster_count behind the frontier
sub resize {
my ($fs, $size) = @_;
my ($min, $max) = (min_size($fs), max_size($fs));
$size += $min if $size =~ /^\+/;
$size >= $min or die "Minimum filesystem size is $min sectors";
$size <= $max or die "Maximum filesystem size is $max sectors";
log::l("resize_fat: Partition size will be " . (($size * $SECTORSIZE) >> 20) . "Mb (well exactly ${size} sectors)");
my $new_data_size = $size * $SECTORSIZE - $fs->{cluster_offset};
my $new_nb_clusters = divide($new_data_size, $fs->{cluster_size});
my $used_size = used_size($fs);
log::l("resize_fat: Break point for moving files is " . (($used_size * $SECTORSIZE) >> 20) . " Mb ($used_size sectors)");
if ($size < $used_size) {
log::l("resize_fat: Allocating new clusters");
resize_fat::fat::allocate_remap($fs, $new_nb_clusters);
log::l("resize_fat: Copying files");
copy_clusters($fs, $new_nb_clusters);
log::l("resize_fat: Copying directories");
construct_dir_tree($fs);
log::l("Writing new FAT...");
resize_fat::fat::update($fs);
resize_fat::fat::write($fs);
} else {
log::l("resize_fat: Nothing need to be moved");
}
$fs->{nb_sectors} = $size;
$fs->{nb_clusters} = $new_nb_clusters;
$fs->{clusters}{count}{free} =
$fs->{nb_clusters} - $fs->{clusters}{count}{used} - $fs->{clusters}{count}{bad} - 2;
$fs->{system_id} = 'was here!';
$fs->{small_nb_sectors} = 0;
$fs->{big_nb_sectors} = $size;
log::l("resize_fat: Writing new boot sector...");
resize_fat::boot_sector::write($fs);
$resize_fat::isFAT32 and eval { resize_fat::info_sector::write($fs) }; #- does not matter if this fails - its pretty useless!
MDK::Common::System::sync();
close $fs->{fd};
log::l("resize_fat: done");
}
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