#!/usr/bin/perl # DiskDrake # Copyright (C) 1999 MandrakeSoft (pixel@mandrakesoft.com) # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2, or (at your option) # any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. # This is mainly a perl rewrite of the work of Andrew Clausen (libresize) package resize_fat::main; # $Id$ 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 $fs->{fd}; resize_fat::c_rewritten::free_all(); } #- copy all clusters >= to a new place on the partition, less #- than . Only copies files, not directories. #- (use of buffer needed because the seeks slow like hell the hard drive) sub copy_clusters { my ($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 ($resize_fat::isFAT32) { #- fat32's root must remain in the first 64k clusters #- so don't set it as DIRECTORY, it will be specially handled resize_fat::c_rewritten::set_flag($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) }; #- doesn't matter if this fails - its pretty useless! MDK::Common::System::sync(); close $fs->{fd}; log::l("resize_fat: done"); } 581'>perl-install/standalone.pm
blob: 38f0edfc3783b3915445225346567ba238bea3be (plain) 
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