/[fuse-comp]/fuse-comp.pl
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /fuse-comp.pl

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Revision 1 - (show annotations)
Sun Jul 8 12:51:33 2007 UTC (12 years, 3 months ago) by dpavlin
File MIME type: text/plain
File size: 6918 byte(s)
first code drop of gzip compressing filesystem
1 #!/usr/bin/perl -w
2 use strict;
3 use threads;
4 use threads::shared;
5
6 use Fuse;
7 use IO::File;
8 use POSIX qw(ENOENT ENOSYS EEXIST EPERM O_RDONLY O_RDWR O_APPEND O_CREAT);
9 use Fcntl qw(S_ISBLK S_ISCHR S_ISFIFO SEEK_SET);
10 require 'syscall.ph'; # for SYS_mknod and SYS_lchown
11 use PerlIO::gzip;
12 use File::Path;
13 use Data::Dump qw/dump/;
14
15 my $mount = {
16 from => '/tmp/comp',
17 to => '/tmp/no-comp',
18 tmp => '/dev/shm/comp',
19 };
20
21 my $debug = 1;
22
23 my $skip_extensions_regex = qr/\.(sw[px]|gif|png|jpeg|jpg|avi|rar|zip|bz2|gz|tgz|avi|mpeg|mpg)$/i;
24
25 foreach my $dir ( keys %$mount ) {
26 if ( ! -e $mount->{$dir} ) {
27 warn "created $mount->{$dir}\n";
28 mkdir $mount->{$dir} || die "can't create $mount->{$dir}: $!";
29 }
30 }
31
32 my $pending;
33
34 sub fixup {
35 my ( $path ) = @_;
36 my $full = $mount->{from} . '/' . $path;
37 if ( -e $full . '.gz' ) {
38 return $full . '.gz';
39 }
40 return $full;
41 }
42
43 sub original_name {
44 my $p = shift;
45 $p =~ s/\.gz$//;
46 return $p;
47 };
48
49 sub gzip_original_size {
50 my $file = shift;
51
52 return unless -e $file;
53
54 my $buff;
55
56 open(my $fh, $file) || die "can't open $file: $!";
57
58 # read($fh, $buff, 10 );
59 # print dump( unpack("nccVcc", $buff ) );
60
61 seek($fh, -4, 2);
62 read($fh, $buff, 4 );
63 close($fh);
64
65 return unpack("L", $buff);
66 }
67
68 sub x_getattr {
69 my ($file) = fixup(shift);
70 my (@list) = lstat($file);
71 $list[7] = gzip_original_size( $file ) if ( $list[7] && $file =~ m/\.gz$/ );
72 return -$! unless @list;
73 return @list;
74 }
75
76 sub x_getdir {
77 my ($dirname) = fixup(shift);
78 unless(opendir(DIRHANDLE,$dirname)) {
79 return -ENOENT();
80 }
81 my @files = map { original_name( $_ ) } readdir(DIRHANDLE);
82 closedir(DIRHANDLE);
83 return (@files, 0);
84 }
85
86 sub file_copy {
87 my ( $s_opt, $s_path, $d_opt, $d_path ) = @_;
88 warn "## file_copy( $s_opt $s_path $d_opt $d_path )\n";
89 open(my $s, $s_opt, $s_path ) || die "can't open $s_path: $!";
90 open(my $d, $d_opt, $d_path ) || die "can't open $d_path: $!";
91 my $buff;
92 while( read( $s, $buff, 65535 ) ) {
93 print $d $buff || die "can't write into $d_path: $!";
94 warn ">> ", length($buff), " bytes, offset ", tell($s), " -> ", tell($d), "\n" if $debug;
95 }
96 close($d) || warn "can't close $d_path: $!";
97 close($s) || warn "can't close $s_path: $!";
98 }
99
100 sub x_open {
101 my ($file) = shift;
102 my ($mode) = shift;
103 $pending->{$file}->{open}++;
104 my $fh;
105 if ( $pending->{$file}->{open} == 1 ) {
106 warn "# open( $file, $mode )\n";
107 my $path = fixup($file);
108 my $tmp = $mount->{tmp} . '/' . $file;
109 if ( -e $tmp ) {
110 $path = $tmp;
111 } elsif ( $path =~ m/\.gz$/ ) {
112 my $dest_path = $tmp;
113 $dest_path =~ s!/[^/]+$!!; #!vim-fix
114 mkpath $dest_path unless -e $dest_path;
115 file_copy( '<:gzip', $path, '>', $tmp );
116 $path = $tmp;
117 }
118 return -$! unless sysopen($fh , $path, $mode);
119 $pending->{$file}->{fh} = $fh;
120 $pending->{$file}->{path} = $path;
121 } elsif ( ! defined( $pending->{$file}->{fh} ) ) {
122 die "can't find fh for $file ", dump($pending);
123 }
124 return 0;
125 }
126
127 sub x_read {
128 my ($file,$bufsize,$off) = @_;
129 my ($rv) = -ENOSYS();
130 my $path = fixup( $file );
131 return -ENOENT() unless -e $path;
132 my ($fsize) = -s $path;
133 my $fh = $pending->{$file}->{fh} || die "no fh? ", dump( $pending );
134 if(seek($fh,$off,SEEK_SET)) {
135 read($fh,$rv,$bufsize);
136 }
137 return $rv;
138 }
139
140 sub x_write {
141 my ($file,$buf,$off) = @_;
142 $pending->{$file}->{write}++;
143 my ($rv);
144 my $path = fixup($file);
145 return -ENOENT() unless -e $path;
146 my ($fsize) = -s $path;
147 my $fh = $pending->{$file}->{fh};
148 return -ENOSYS() unless $fh;
149 if($rv = seek( $fh ,$off,SEEK_SET)) {
150 $rv = print( $fh $buf );
151 }
152 $rv = -ENOSYS() unless $rv;
153 return length($buf);
154 }
155
156 sub err { return (-shift || -$!) }
157
158 sub x_readlink { return readlink(fixup(shift)); }
159 sub x_unlink { return unlink(fixup(shift)) ? 0 : -$!; }
160
161 sub x_symlink { return symlink(shift,fixup(shift)) ? 0 : -$!; }
162
163 sub x_rename {
164 my ($old) = fixup(shift);
165 my ($new) = fixup(shift);
166 my ($err) = rename($old,$new) ? 0 : -ENOENT();
167 return $err;
168 }
169 sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! }
170
171 sub x_chown {
172 my ($path) = fixup(shift);
173 print "nonexistent $path\n" unless -e $path;
174 my ($uid,$gid) = @_;
175 # perl's chown() does not chown symlinks, it chowns the symlink's
176 # target. it fails when the link's target doesn't exist, because
177 # the stat64() syscall fails.
178 # this causes error messages when unpacking symlinks in tarballs.
179 my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0;
180 return $err;
181 }
182
183 sub x_chmod {
184 my ($path) = fixup(shift);
185 my ($mode) = shift;
186 my ($err) = chmod($mode,$path) ? 0 : -$!;
187 return $err;
188 }
189
190 sub x_truncate { return truncate(fixup(shift),shift) ? 0 : -$! ; }
191 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
192
193 sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
194 sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
195
196 sub x_mknod {
197 # since this is called for ALL files, not just devices, I'll do some checks
198 # and possibly run the real mknod command.
199 my ($file, $modes, $dev) = @_;
200 $file = fixup($file);
201 $! = 0;
202 syscall(&SYS_mknod,$file,$modes,$dev);
203 return -$!;
204 }
205
206 sub x_release {
207 my ( $file, $mode ) = @_;
208 if ( ! defined( $pending->{$file} ) ) {
209 warn "release $file, NO PENDING DATA\n";
210 return 0;
211 } elsif ( ! defined( $pending->{$file}->{write} ) ) {
212 warn "release $file, not written into\n";
213 } elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) {
214 close( $pending->{$file}->{fh} ) || warn "can't close $file: $!";
215 if ( $file =~ $skip_extensions_regex ) {
216 warn "release $file $mode -- uncompressed\n";
217 } else {
218 warn "release $file $mode -- compressing\n";
219
220 my $path = $pending->{$file}->{path} || die "no path for $file ? ", dump( $pending );
221 my $dest = fixup( $file );
222
223 if ( $dest =~ /\.gz$/ ) {
224 warn "## remove old $dest\n";
225 unlink $dest || die "can't remove $dest: $!";
226 $dest =~ s/\.gz$//;
227 }
228
229 file_copy( '<', $path, '>:gzip', $dest . '.gz' );
230
231 # FIXME add timeout to remove uncompressed version?
232 unlink $path || warn "can't remove $path: $!";
233 }
234 } else {
235 warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
236 $pending->{$file}->{open}--;
237 return 0;
238 }
239 delete( $pending->{$file} );
240 return 0;
241 }
242
243 # kludge
244 sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
245 Fuse::main(
246 mountpoint=>$mount->{to},
247 getattr =>"main::x_getattr",
248 readlink=>"main::x_readlink",
249 getdir =>"main::x_getdir",
250 mknod =>"main::x_mknod",
251 mkdir =>"main::x_mkdir",
252 unlink =>"main::x_unlink",
253 rmdir =>"main::x_rmdir",
254 symlink =>"main::x_symlink",
255 rename =>"main::x_rename",
256 link =>"main::x_link",
257 chmod =>"main::x_chmod",
258 chown =>"main::x_chown",
259 truncate=>"main::x_truncate",
260 utime =>"main::x_utime",
261 open =>"main::x_open",
262 read =>"main::x_read",
263 write =>"main::x_write",
264 statfs =>"main::x_statfs",
265 release =>"main::x_release",
266 # threaded=>1,
267 # debug => 1,
268 );

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