/[fuse-comp]/fuse-comp.pl
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Annotation of /fuse-comp.pl

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Revision 8 - (hide annotations)
Sun Jul 8 17:04:18 2007 UTC (12 years, 2 months ago) by dpavlin
File MIME type: text/plain
File size: 8238 byte(s)
fix unlink to actually work, decode open mode
1 dpavlin 1 #!/usr/bin/perl -w
2     use strict;
3     use threads;
4     use threads::shared;
5    
6     use Fuse;
7     use POSIX qw(ENOENT ENOSYS EEXIST EPERM O_RDONLY O_RDWR O_APPEND O_CREAT);
8     use Fcntl qw(S_ISBLK S_ISCHR S_ISFIFO SEEK_SET);
9     require 'syscall.ph'; # for SYS_mknod and SYS_lchown
10     use PerlIO::gzip;
11     use File::Path;
12     use Data::Dump qw/dump/;
13 dpavlin 5 use Carp qw/confess/;
14 dpavlin 1
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 dpavlin 4 my $skip_extensions_regex = qr/\.(?:sw[a-z]|gif|png|jpeg|jpg|avi|rar|zip|bz2|gz|tgz|avi|mpeg|mpg|tmp|temp)$/i;
24 dpavlin 1
25 dpavlin 5 # don't compress files smaller than this
26 dpavlin 8 my $min_compress_size = 512;
27 dpavlin 5
28 dpavlin 1 foreach my $dir ( keys %$mount ) {
29     if ( ! -e $mount->{$dir} ) {
30     warn "created $mount->{$dir}\n";
31     mkdir $mount->{$dir} || die "can't create $mount->{$dir}: $!";
32     }
33     }
34    
35     my $pending;
36    
37     sub fixup {
38     my ( $path ) = @_;
39     my $full = $mount->{from} . '/' . $path;
40     if ( -e $full . '.gz' ) {
41     return $full . '.gz';
42     }
43     return $full;
44     }
45    
46     sub original_name {
47     my $p = shift;
48     $p =~ s/\.gz$//;
49     return $p;
50     };
51    
52     sub gzip_original_size {
53     my $file = shift;
54    
55     return unless -e $file;
56    
57     my $buff;
58    
59     open(my $fh, $file) || die "can't open $file: $!";
60    
61     # read($fh, $buff, 10 );
62     # print dump( unpack("nccVcc", $buff ) );
63    
64     seek($fh, -4, 2);
65     read($fh, $buff, 4 );
66     close($fh);
67    
68     return unpack("L", $buff);
69     }
70    
71 dpavlin 5 sub unlink_all {
72     my $file = shift;
73 dpavlin 8 warn "# unlink_all( $file )\n";
74    
75     my $path = fixup( $file );
76     unlink $path || return 0;
77    
78     my $tmp = $mount->{tmp} . '/' . $file;
79     unlink $tmp if ( -e $tmp );
80    
81 dpavlin 5 delete( $pending->{$file} );
82     return 1;
83     }
84    
85 dpavlin 1 sub x_getattr {
86     my ($file) = fixup(shift);
87     my (@list) = lstat($file);
88     $list[7] = gzip_original_size( $file ) if ( $list[7] && $file =~ m/\.gz$/ );
89     return -$! unless @list;
90     return @list;
91     }
92    
93     sub x_getdir {
94     my ($dirname) = fixup(shift);
95     unless(opendir(DIRHANDLE,$dirname)) {
96     return -ENOENT();
97     }
98     my @files = map { original_name( $_ ) } readdir(DIRHANDLE);
99     closedir(DIRHANDLE);
100     return (@files, 0);
101     }
102    
103     sub file_copy {
104     my ( $s_opt, $s_path, $d_opt, $d_path ) = @_;
105     warn "## file_copy( $s_opt $s_path $d_opt $d_path )\n";
106 dpavlin 5 open(my $s, $s_opt, $s_path ) || confess "can't open $s_path: $!\npending = ", dump( $pending );
107     open(my $d, $d_opt, $d_path ) || confess "can't open $d_path: $!";
108 dpavlin 1 my $buff;
109     while( read( $s, $buff, 65535 ) ) {
110 dpavlin 5 print $d $buff || confess "can't write into $d_path: $!";
111 dpavlin 1 warn ">> ", length($buff), " bytes, offset ", tell($s), " -> ", tell($d), "\n" if $debug;
112     }
113     close($d) || warn "can't close $d_path: $!";
114     close($s) || warn "can't close $s_path: $!";
115 dpavlin 5 warn "-- $s_path [", -s $s_path, "] >>> $d_path [", -s $d_path, "]\n" if $debug;
116     my ($mode,$uid,$gid,$atime,$mtime) = (stat $s_path)[2,4,5,8,9];
117    
118     chmod $mode, $d_path || warn "chmod( $mode $d_path ) failed: $!\n";
119     chown $uid,$gid,$d_path || warn "chown( $uid $gid $d_path ) failed: $!\n";
120     utime $atime,$mtime,$d_path || warn "utime( $atime $mtime $d_path ) failed: $!\n";
121 dpavlin 8
122     undef $d;
123     undef $s;
124 dpavlin 1 }
125    
126     sub x_open {
127     my ($file) = shift;
128     my ($mode) = shift;
129     $pending->{$file}->{open}++;
130 dpavlin 8
131     my $mode_desc = {
132     rdonly => $mode && O_RDONLY,
133     rdwr => $mode && O_RDWR,
134     append => $mode && O_APPEND,
135     create => $mode && O_CREAT,
136     };
137     warn "# open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode: ", dump( $mode_desc ),"\n";
138 dpavlin 1 my $fh;
139 dpavlin 8
140     my $path = fixup($file);
141     my $tmp = $mount->{tmp} . '/' . $file;
142     if ( -e $tmp ) {
143     $path = $tmp;
144     } elsif ( $path =~ m/\.gz$/ ) {
145     my $dest_path = $tmp;
146     $dest_path =~ s!/[^/]+$!!; #!vim-fix
147     mkpath $dest_path unless -e $dest_path;
148     file_copy( '<:gzip', $path, '>', $tmp );
149     $path = $tmp;
150     }
151     warn ">>> open abs path: $path ", -s $path, " bytes\n";
152     return -$! unless sysopen($fh , $path, $mode);
153    
154     $pending->{$file}->{fh} = $fh;
155     $pending->{$file}->{path} = $path;
156     $pending->{$file}->{mode} = {
157     rdonly => $mode && O_RDONLY,
158     rdwr => $mode && O_RDWR,
159     append => $mode && O_APPEND,
160     create => $mode && O_CREAT,
161 dpavlin 5 };
162 dpavlin 1 return 0;
163     }
164    
165     sub x_read {
166     my ($file,$bufsize,$off) = @_;
167     my ($rv) = -ENOSYS();
168     my $path = fixup( $file );
169     return -ENOENT() unless -e $path;
170     my ($fsize) = -s $path;
171 dpavlin 5 my $fh = $pending->{$file}->{fh} || confess "no fh? ", dump( $pending );
172 dpavlin 1 if(seek($fh,$off,SEEK_SET)) {
173     read($fh,$rv,$bufsize);
174     }
175     return $rv;
176     }
177    
178     sub x_write {
179     my ($file,$buf,$off) = @_;
180     $pending->{$file}->{write}++;
181     my ($rv);
182     my $path = fixup($file);
183     return -ENOENT() unless -e $path;
184     my ($fsize) = -s $path;
185     my $fh = $pending->{$file}->{fh};
186     return -ENOSYS() unless $fh;
187     if($rv = seek( $fh ,$off,SEEK_SET)) {
188     $rv = print( $fh $buf );
189     }
190     $rv = -ENOSYS() unless $rv;
191     return length($buf);
192     }
193    
194     sub err { return (-shift || -$!) }
195    
196     sub x_readlink { return readlink(fixup(shift)); }
197 dpavlin 5 sub x_unlink { return unlink_all( shift ) ? 0 : -$! }
198 dpavlin 1
199     sub x_symlink { return symlink(shift,fixup(shift)) ? 0 : -$!; }
200    
201     sub x_rename {
202     my ($old) = fixup(shift);
203     my ($new) = fixup(shift);
204     my ($err) = rename($old,$new) ? 0 : -ENOENT();
205     return $err;
206     }
207     sub x_link { return link(fixup(shift),fixup(shift)) ? 0 : -$! }
208    
209     sub x_chown {
210     my ($path) = fixup(shift);
211     print "nonexistent $path\n" unless -e $path;
212     my ($uid,$gid) = @_;
213     # perl's chown() does not chown symlinks, it chowns the symlink's
214     # target. it fails when the link's target doesn't exist, because
215     # the stat64() syscall fails.
216     # this causes error messages when unpacking symlinks in tarballs.
217     my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0;
218     return $err;
219     }
220    
221     sub x_chmod {
222     my ($path) = fixup(shift);
223     my ($mode) = shift;
224     my ($err) = chmod($mode,$path) ? 0 : -$!;
225     return $err;
226     }
227    
228     sub x_truncate { return truncate(fixup(shift),shift) ? 0 : -$! ; }
229     sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
230    
231     sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
232     sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
233    
234     sub x_mknod {
235     # since this is called for ALL files, not just devices, I'll do some checks
236     # and possibly run the real mknod command.
237     my ($file, $modes, $dev) = @_;
238     $file = fixup($file);
239     $! = 0;
240     syscall(&SYS_mknod,$file,$modes,$dev);
241     return -$!;
242     }
243    
244     sub x_release {
245     my ( $file, $mode ) = @_;
246     if ( ! defined( $pending->{$file} ) ) {
247     warn "release $file, NO PENDING DATA\n";
248     return 0;
249     } elsif ( ! defined( $pending->{$file}->{write} ) ) {
250     warn "release $file, not written into\n";
251     } elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) {
252     close( $pending->{$file}->{fh} ) || warn "can't close $file: $!";
253 dpavlin 5 my $path = $pending->{$file}->{path} || confess "no path for $file ? ", dump( $pending );
254     my $dest = fixup( $file );
255    
256     # cleanup old compressed copy
257     if ( $dest =~ /\.gz$/ ) {
258     warn "## remove old $dest\n";
259 dpavlin 8 unlink $dest || confess "can't remove $dest: $!";
260 dpavlin 5 $dest =~ s/\.gz$//;
261     }
262    
263 dpavlin 1 if ( $file =~ $skip_extensions_regex ) {
264     warn "release $file $mode -- uncompressed\n";
265 dpavlin 5 file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
266     } elsif ( -s $path < $min_compress_size ) {
267     warn "release $file -- uncompressed, too small ", -s $path, " bytes\n";
268     file_copy( '<', $path, '>', $dest ) if ( $path ne $dest );
269 dpavlin 1 } else {
270     warn "release $file $mode -- compressing\n";
271    
272    
273     file_copy( '<', $path, '>:gzip', $dest . '.gz' );
274    
275     # FIXME add timeout to remove uncompressed version?
276 dpavlin 8 unlink $path || warn "can't remove $path: $!";
277 dpavlin 1 }
278     } else {
279     warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n";
280     $pending->{$file}->{open}--;
281     return 0;
282     }
283     delete( $pending->{$file} );
284     return 0;
285     }
286    
287     # kludge
288     sub x_statfs {return 255,1000000,500000,1000000,500000,4096}
289     Fuse::main(
290     mountpoint=>$mount->{to},
291     getattr =>"main::x_getattr",
292     readlink=>"main::x_readlink",
293     getdir =>"main::x_getdir",
294     mknod =>"main::x_mknod",
295     mkdir =>"main::x_mkdir",
296     unlink =>"main::x_unlink",
297     rmdir =>"main::x_rmdir",
298     symlink =>"main::x_symlink",
299     rename =>"main::x_rename",
300     link =>"main::x_link",
301     chmod =>"main::x_chmod",
302     chown =>"main::x_chown",
303     truncate=>"main::x_truncate",
304     utime =>"main::x_utime",
305     open =>"main::x_open",
306     read =>"main::x_read",
307     write =>"main::x_write",
308     statfs =>"main::x_statfs",
309     release =>"main::x_release",
310     # threaded=>1,
311     # debug => 1,
312     );

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