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
|
#!/usr/bin/perl
package resize_fat::main;
use diagnostics;
use strict;
use log;
use common qw(:common :system :constant);
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;
#@ARGV == 2 or die "usage: fatresize <device> <size>\n <size> = 100 means `resize to 100Mb'\n <size> = +10 means `keep 10Mb of free space'\n";
#
#my $fs = init($ARGV[0]);
#resize($fs, $ARGV[1]);
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 => $fs_name } ;
resize_fat::io::open($fs);
resize_fat::boot_sector::read($fs);
$resize_fat::isFAT32 and eval { resize_fat::info_sector::read($fs) };
resize_fat::fat::read($fs);
resize_fat::fat::check($fs);
resize_fat::any::flag_clusters($fs);
bless $fs, $type;
}
# copy all clusters >= <start_cluster> to a new place on the partition, less
# than <start_cluster>. Only copies files, not directories.
# (use of buffer needed because the seeks slow like hell the hard drive)
sub copy_clusters {
my ($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++) {
$fs->{fat_flag_map}->[$cluster] == $resize_fat::any::FILE or next;
push @buffer, $fs->{fat_remap}->[$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
$fs->{fat_flag_map}->[$fs->{fat32_root_dir_cluster}] = $resize_fat::any::FREE;
}
for (my $cluster = 2; $cluster < $fs->{nb_clusters} + 2; $cluster++) {
$fs->{fat_flag_map}->[$cluster] == $resize_fat::any::DIRECTORY or next;
resize_fat::io::write_cluster($fs,
$fs->{fat_remap}->[$cluster],
resize_fat::directory::remap($fs, resize_fat::io::read_cluster($fs, $cluster)));
}
sync();
# until now, only free clusters have been written. it's a null operation if we stop here.
# it means no corruption :)
#
# now we must be as fast as possible!
# remapping non movable root directory
if ($resize_fat::isFAT32) {
my $cluster = $fs->{fat32_root_dir_cluster};
resize_fat::io::write_cluster($fs,
$fs->{fat_remap}->[$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($) { &resize_fat::any::max_size }
# resize
# - size is in sectors
# - checks boundaries before starting
# - copies all data beyond new_cluster_count behind the frontier
sub resize {
my ($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 fill 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, $fs->{cluster_size});
log::l("resize_fat: Allocating new clusters");
resize_fat::fat::allocate_remap($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);
$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};
$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!
sync();
log::l("resize_fat: done");
}
|
