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dpavlin |
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#!/usr/bin/perl -w |
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use strict; |
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use threads; |
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use threads::shared; |
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use Fuse; |
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use POSIX qw(ENOENT ENOSYS EEXIST EPERM O_RDONLY O_RDWR O_APPEND O_CREAT); |
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use Fcntl qw(S_ISBLK S_ISCHR S_ISFIFO SEEK_SET); |
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require 'syscall.ph'; # for SYS_mknod and SYS_lchown |
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use PerlIO::gzip; |
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use File::Path; |
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use Data::Dump qw/dump/; |
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dpavlin |
5 |
use Carp qw/confess/; |
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dpavlin |
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use IO::File; |
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dpavlin |
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use Getopt::Long; |
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dpavlin |
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dpavlin |
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my $debug = 0; |
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my $fuse_debug = 0; |
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GetOptions( |
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'debug+' => \$debug, |
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'fuse-debug+' => \$fuse_debug, |
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); |
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dpavlin |
1 |
my $mount = { |
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from => '/tmp/comp', |
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to => '/tmp/no-comp', |
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tmp => '/dev/shm/comp', |
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}; |
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dpavlin |
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my $skip_extensions_regex = qr/\.(?:sw[a-z]|gif|png|jpeg|jpg|avi|rar|zip|bz2|gz|tgz|avi|mpeg|mpg|tmp|temp)$/i; |
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dpavlin |
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dpavlin |
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# don't compress files smaller than this |
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dpavlin |
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my $min_compress_size = 512; |
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dpavlin |
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|
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dpavlin |
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foreach my $dir ( keys %$mount ) { |
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if ( ! -e $mount->{$dir} ) { |
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warn "created $mount->{$dir}\n"; |
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mkdir $mount->{$dir} || die "can't create $mount->{$dir}: $!"; |
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} |
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} |
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my $pending; |
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dpavlin |
27 |
sub real_name { |
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my ( $dir, $name ) = @_; |
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if ( -e "$dir/${name}.gz" ) { |
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dpavlin |
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confess "ASSERT: unexpected $dir/$name exists" if -e "$dir/$name"; |
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dpavlin |
27 |
return "${name}.gz"; |
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} |
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return $name; |
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} |
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dpavlin |
1 |
sub fixup { |
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my ( $path ) = @_; |
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dpavlin |
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return $mount->{from} . '/' . real_name( $mount->{from}, $path ); |
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dpavlin |
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} |
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sub original_name { |
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my $p = shift; |
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$p =~ s/\.gz$//; |
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return $p; |
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}; |
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sub gzip_original_size { |
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my $file = shift; |
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return unless -e $file; |
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my $buff; |
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open(my $fh, $file) || die "can't open $file: $!"; |
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# read($fh, $buff, 10 ); |
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# print dump( unpack("nccVcc", $buff ) ); |
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seek($fh, -4, 2); |
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read($fh, $buff, 4 ); |
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close($fh); |
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return unpack("L", $buff); |
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} |
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sub x_getattr { |
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my ($file) = fixup(shift); |
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my (@list) = lstat($file); |
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$list[7] = gzip_original_size( $file ) if ( $list[7] && $file =~ m/\.gz$/ ); |
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return -$! unless @list; |
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return @list; |
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} |
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sub x_getdir { |
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my ($dirname) = fixup(shift); |
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unless(opendir(DIRHANDLE,$dirname)) { |
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return -ENOENT(); |
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} |
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my @files = map { original_name( $_ ) } readdir(DIRHANDLE); |
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closedir(DIRHANDLE); |
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return (@files, 0); |
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} |
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sub file_copy { |
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my ( $s_opt, $s_path, $d_opt, $d_path ) = @_; |
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dpavlin |
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warn "## file_copy( $s_opt $s_path [",-s $s_path,"] $d_opt $d_path [",-e $d_path ? -s $d_path : 'new',"])\n" if $debug; |
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dpavlin |
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open(my $s, $s_opt, $s_path ) || confess "can't open $s_path: $!\npending = ", dump( $pending ); |
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open(my $d, $d_opt, $d_path ) || confess "can't open $d_path: $!"; |
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dpavlin |
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my $buff; |
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while( read( $s, $buff, 65535 ) ) { |
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dpavlin |
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print $d $buff || confess "can't write into $d_path: $!"; |
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dpavlin |
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warn ">> [", length($buff), "] offset ", tell($s), " -> ", tell($d), "\n" if $debug; |
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dpavlin |
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} |
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close($d) || warn "can't close $d_path: $!"; |
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close($s) || warn "can't close $s_path: $!"; |
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dpavlin |
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warn "-- $s_path [", -s $s_path, "] >>> $d_path [", -s $d_path, "]\n" if $debug; |
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my ($mode,$uid,$gid,$atime,$mtime) = (stat $s_path)[2,4,5,8,9]; |
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chmod $mode, $d_path || warn "chmod( $mode $d_path ) failed: $!\n"; |
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chown $uid,$gid,$d_path || warn "chown( $uid $gid $d_path ) failed: $!\n"; |
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utime $atime,$mtime,$d_path || warn "utime( $atime $mtime $d_path ) failed: $!\n"; |
120 |
dpavlin |
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undef $d; |
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undef $s; |
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dpavlin |
1 |
} |
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dpavlin |
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sub create_tmp_file { |
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my $file = shift; |
127 |
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my $path = fixup( $file ); |
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my $tmp = $mount->{tmp} . '/' . $file; |
130 |
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if ( -e $tmp ) { |
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$path = $tmp; |
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} elsif ( $path =~ m/\.gz$/ ) { |
133 |
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my $dest_path = $tmp; |
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$dest_path =~ s!/[^/]+$!!; #!vim-fix |
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mkpath $dest_path unless -e $dest_path; |
136 |
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if ( -s $path ) { |
137 |
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file_copy( '<:gzip', $path, '>', $tmp ) |
138 |
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} else { |
139 |
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warn "ERROR: filesystem corruption, $path is zero size\n"; |
140 |
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} |
141 |
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$path = $tmp; |
142 |
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} |
143 |
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warn "## create_temp_file( $file ) => $path [", -s $path, "]\n"; |
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return $path; |
145 |
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} |
146 |
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147 |
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sub compress_path_dest { |
148 |
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my ( $path, $dest ) = @_; |
149 |
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150 |
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# cleanup old compressed copy |
151 |
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if ( $dest =~ /\.gz$/ ) { |
152 |
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warn "## remove old $dest\n"; |
153 |
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unlink $dest || confess "can't remove $dest: $!"; |
154 |
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$dest =~ s/\.gz$//; |
155 |
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} |
156 |
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157 |
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if ( $path =~ $skip_extensions_regex ) { |
158 |
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warn "$path [",-s $path,"] skipped compression\n"; |
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file_copy( '<', $path, '>', $dest ) if ( $path ne $dest ); |
160 |
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} elsif ( -s $path < $min_compress_size ) { |
161 |
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warn "$path [",-s $path,"] uncompressed, too small\n"; |
162 |
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file_copy( '<', $path, '>', $dest ) if ( $path ne $dest ); |
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} else { |
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warn "$path [",-s $path,"] compressing\n"; |
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my $comp = $dest . '.gz'; |
167 |
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file_copy( '<', $path, '>:gzip', $comp ); |
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169 |
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my ( $size_path, $size_comp ) = ( -s $path, -s $comp ); |
170 |
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171 |
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if ( $size_path <= $size_comp ) { |
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warn ">>> $size_path <= $size_comp leaving uncompressed\n"; |
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unlink $comp || confess "can't remove: $comp: $!"; |
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} else { |
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warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"%\n"; |
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# FIXME add timeout to remove uncompressed version? |
177 |
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unlink $path || confess "can't remove $path: $!"; |
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} |
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} |
180 |
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} |
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182 |
dpavlin |
1 |
sub x_open { |
183 |
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my ($file) = shift; |
184 |
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my ($mode) = shift; |
185 |
dpavlin |
12 |
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186 |
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if ( $file eq '/.debug' ) { |
187 |
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my $path = $mount->{from} . '/.debug'; |
188 |
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open( my $debug, '>', $path ) || die "can't open $path: $!"; |
189 |
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my $dump = dump( $pending ); |
190 |
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print $debug "pending = $dump\n"; |
191 |
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close($debug); |
192 |
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$pending->{'/.debug'}->{path} = $path; |
193 |
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warn "## created dump $path $dump\n"; |
194 |
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return 0; |
195 |
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} |
196 |
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197 |
dpavlin |
1 |
$pending->{$file}->{open}++; |
198 |
dpavlin |
8 |
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199 |
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my $mode_desc = { |
200 |
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rdonly => $mode && O_RDONLY, |
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rdwr => $mode && O_RDWR, |
202 |
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append => $mode && O_APPEND, |
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create => $mode && O_CREAT, |
204 |
dpavlin |
14 |
trunc => $mode && O_TRUNC, |
205 |
dpavlin |
8 |
}; |
206 |
dpavlin |
28 |
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207 |
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my $path = create_tmp_file( $file ); |
208 |
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209 |
dpavlin |
19 |
warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug; |
210 |
dpavlin |
28 |
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211 |
dpavlin |
1 |
my $fh; |
212 |
dpavlin |
8 |
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213 |
dpavlin |
21 |
if ( sysopen($fh , $path, $mode) ) { |
214 |
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close($fh) || confess "can't close $path: $!"; |
215 |
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warn "<<< open $path [", -e $path ? -s $path : 'new' , "]\n"; |
216 |
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$pending->{$file}->{path} = $path; |
217 |
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return 0; |
218 |
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} else { |
219 |
dpavlin |
26 |
warn "ERROR: can't open $path -- $!"; |
220 |
dpavlin |
21 |
return -$!; |
221 |
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} |
222 |
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223 |
dpavlin |
1 |
} |
224 |
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225 |
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sub x_read { |
226 |
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my ($file,$bufsize,$off) = @_; |
227 |
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my ($rv) = -ENOSYS(); |
228 |
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my $path = fixup( $file ); |
229 |
dpavlin |
10 |
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230 |
dpavlin |
12 |
confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} ); |
231 |
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232 |
dpavlin |
1 |
return -ENOENT() unless -e $path; |
233 |
dpavlin |
10 |
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234 |
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my $fh = new IO::File; |
235 |
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return -ENOSYS() unless open($fh,$pending->{$file}->{path}); |
236 |
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237 |
dpavlin |
1 |
if(seek($fh,$off,SEEK_SET)) { |
238 |
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read($fh,$rv,$bufsize); |
239 |
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} |
240 |
dpavlin |
10 |
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241 |
dpavlin |
1 |
return $rv; |
242 |
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} |
243 |
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244 |
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sub x_write { |
245 |
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my ($file,$buf,$off) = @_; |
246 |
dpavlin |
25 |
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247 |
dpavlin |
10 |
my $rv; |
248 |
dpavlin |
1 |
my $path = fixup($file); |
249 |
dpavlin |
10 |
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250 |
dpavlin |
12 |
confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} ); |
251 |
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252 |
dpavlin |
1 |
return -ENOENT() unless -e $path; |
253 |
dpavlin |
10 |
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254 |
dpavlin |
26 |
$path = $pending->{$file}->{path} || confess "no path for $file in ", dump( $pending ); |
255 |
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confess "write into non-existant $path for $file: $!" unless -e $path; |
256 |
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257 |
dpavlin |
10 |
my $fh = new IO::File; |
258 |
dpavlin |
26 |
return -ENOSYS() unless open($fh,'+<',$path); |
259 |
dpavlin |
1 |
if($rv = seek( $fh ,$off,SEEK_SET)) { |
260 |
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$rv = print( $fh $buf ); |
261 |
dpavlin |
26 |
warn "## write $path offset $off [",length( $buf ), "]\n" if $debug; |
262 |
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$pending->{$file}->{write}++; |
263 |
dpavlin |
1 |
} |
264 |
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$rv = -ENOSYS() unless $rv; |
265 |
dpavlin |
26 |
close($fh) || warn "can't close $path: $!"; |
266 |
dpavlin |
1 |
return length($buf); |
267 |
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} |
268 |
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269 |
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sub err { return (-shift || -$!) } |
270 |
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271 |
dpavlin |
27 |
sub x_readlink { return readlink(fixup(shift)); } |
272 |
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273 |
dpavlin |
25 |
sub x_unlink { |
274 |
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my $file = shift; |
275 |
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my $path = fixup( $file ); |
276 |
dpavlin |
1 |
|
277 |
dpavlin |
25 |
if ( $file =~ m#\Q/.fuse_hidden\E# ) { |
278 |
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return unlink $path ? 0 : -$1; |
279 |
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} |
280 |
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281 |
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warn "# unlink( $file )\n"; |
282 |
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283 |
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unlink $path || return 0; |
284 |
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285 |
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my $tmp = $mount->{tmp} . '/' . $file; |
286 |
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unlink $tmp if ( -e $tmp ); |
287 |
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288 |
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delete( $pending->{$file} ); |
289 |
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return 0; |
290 |
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} |
291 |
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292 |
dpavlin |
27 |
sub x_symlink { |
293 |
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my ($from,$to) = @_; |
294 |
dpavlin |
1 |
|
295 |
dpavlin |
27 |
my $from_path = $from; #fixup( $from ); |
296 |
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my $to_path = fixup( $to ); |
297 |
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298 |
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my $rv = symlink( $from_path, $to_path ) ? 0 : -$!; |
299 |
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warn "# symlink( $from_path -> $to_path ) = $rv\n" if $debug; |
300 |
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301 |
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my $tmp = $mount->{tmp} . '/' . $from; |
302 |
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if ( -e $tmp ) { |
303 |
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my $tmp_to = $mount->{$tmp} . '/' . $to; |
304 |
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symlink( $tmp, $tmp_to ) || confess "can't symlink $tmp -> $tmp_to: $!"; |
305 |
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} |
306 |
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return $rv; |
307 |
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} |
308 |
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309 |
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sub x_link { |
310 |
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my ($from,$to) = @_; |
311 |
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312 |
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my $from_path = fixup($from); |
313 |
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my $to_path = fixup($to); |
314 |
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$to_path .= '.gz' if ( $from_path =~ m/\.gz$/ && $to_path !~ m/\.gz$/ ); |
315 |
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316 |
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my $rv = link( $from_path, $to_path ) ? 0 : -$!; |
317 |
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318 |
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warn "# link( $from_path -> $to_path ) = $rv\n" if $debug; |
319 |
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320 |
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return $rv; |
321 |
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} |
322 |
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|
323 |
dpavlin |
1 |
sub x_rename { |
324 |
dpavlin |
18 |
my ($old,$new) = @_; |
325 |
|
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my $old_path = fixup($old); |
326 |
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my $new_path = fixup($new); |
327 |
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$new_path .= '.gz' if ( $old_path =~ m/\.gz$/ && $new_path !~ m/\.gz$/ ); |
328 |
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329 |
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my $err = rename($old_path,$new_path) ? 0 : -ENOENT(); |
330 |
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warn "## rename( $old_path => $new_path ) = $err\n"; |
331 |
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332 |
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my $tmp = $mount->{tmp} . '/' . $old; |
333 |
|
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if ( -e $tmp ) { |
334 |
dpavlin |
25 |
if ( $new =~ m#\Q/.fuse_hidden\E# ) { |
335 |
|
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unlink $tmp || confess "can't unlink $tmp for $new\n"; |
336 |
|
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} else { |
337 |
|
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my $new_tmp = $mount->{tmp} . '/' . $new; |
338 |
|
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rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!"; |
339 |
|
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} |
340 |
dpavlin |
18 |
} |
341 |
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|
342 |
dpavlin |
20 |
if (defined( $pending->{$old} )) { |
343 |
|
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$pending->{$new} = $pending->{$old}; |
344 |
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345 |
|
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my $path = $pending->{$old}->{path}; |
346 |
|
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$path =~ s/\Q$old\E/$new/; |
347 |
|
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$pending->{$new}->{path} = $path; |
348 |
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349 |
dpavlin |
25 |
delete( $pending->{$old} ); |
350 |
|
|
warn "## tweaking pending to ", dump( $pending ) if $debug; |
351 |
dpavlin |
20 |
} |
352 |
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|
353 |
dpavlin |
1 |
return $err; |
354 |
|
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} |
355 |
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356 |
|
|
sub x_chown { |
357 |
dpavlin |
26 |
my ($file,$uid,$gid) = @_; |
358 |
|
|
my $path = fixup($file); |
359 |
dpavlin |
1 |
print "nonexistent $path\n" unless -e $path; |
360 |
|
|
# perl's chown() does not chown symlinks, it chowns the symlink's |
361 |
|
|
# target. it fails when the link's target doesn't exist, because |
362 |
|
|
# the stat64() syscall fails. |
363 |
|
|
# this causes error messages when unpacking symlinks in tarballs. |
364 |
|
|
my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0; |
365 |
dpavlin |
26 |
|
366 |
|
|
my $tmp = $mount->{tmp} . '/' . $file; |
367 |
|
|
syscall(&SYS_lchown,$file,$uid,$gid,$path) if -e $tmp; |
368 |
|
|
|
369 |
dpavlin |
1 |
return $err; |
370 |
|
|
} |
371 |
|
|
|
372 |
|
|
sub x_chmod { |
373 |
|
|
my ($path) = fixup(shift); |
374 |
|
|
my ($mode) = shift; |
375 |
|
|
my ($err) = chmod($mode,$path) ? 0 : -$!; |
376 |
|
|
return $err; |
377 |
|
|
} |
378 |
|
|
|
379 |
dpavlin |
14 |
sub x_truncate { |
380 |
|
|
my ( $file,$size ) = @_; |
381 |
dpavlin |
28 |
|
382 |
|
|
#confess "no pending file $file to truncate in ", dump( $pending ) unless defined( $pending->{$file} ); |
383 |
|
|
|
384 |
|
|
my $path; |
385 |
|
|
|
386 |
|
|
if (defined( $pending->{$file} )) { |
387 |
|
|
$pending->{$file}->{write}++; |
388 |
|
|
$path = fixup( $file ); |
389 |
|
|
} else { |
390 |
|
|
$path = create_tmp_file( $file ); |
391 |
|
|
compress_path_dest( $path, fixup( $file ) ); |
392 |
|
|
} |
393 |
dpavlin |
14 |
my $rv = truncate( $path, $size ) ? 0 : -$! ; |
394 |
dpavlin |
21 |
warn "## truncate( $file $size ) $path [", -s $path, "] = $rv\n" if $debug; |
395 |
dpavlin |
27 |
|
396 |
dpavlin |
14 |
return $rv; |
397 |
|
|
} |
398 |
dpavlin |
28 |
|
399 |
dpavlin |
1 |
sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; } |
400 |
|
|
|
401 |
|
|
sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; } |
402 |
|
|
sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; } |
403 |
|
|
|
404 |
|
|
sub x_mknod { |
405 |
|
|
# since this is called for ALL files, not just devices, I'll do some checks |
406 |
|
|
# and possibly run the real mknod command. |
407 |
|
|
my ($file, $modes, $dev) = @_; |
408 |
|
|
$file = fixup($file); |
409 |
|
|
$! = 0; |
410 |
|
|
syscall(&SYS_mknod,$file,$modes,$dev); |
411 |
|
|
return -$!; |
412 |
|
|
} |
413 |
|
|
|
414 |
|
|
sub x_release { |
415 |
|
|
my ( $file, $mode ) = @_; |
416 |
dpavlin |
25 |
|
417 |
|
|
if ( $file =~ m#\Q/.fuse_hidden\E# ) { |
418 |
|
|
warn "release internal $file\n" if $debug; |
419 |
|
|
delete( $pending->{$file} ); |
420 |
|
|
return 0; |
421 |
|
|
} |
422 |
|
|
|
423 |
dpavlin |
1 |
if ( ! defined( $pending->{$file} ) ) { |
424 |
|
|
warn "release $file, NO PENDING DATA\n"; |
425 |
|
|
return 0; |
426 |
|
|
} elsif ( ! defined( $pending->{$file}->{write} ) ) { |
427 |
|
|
warn "release $file, not written into\n"; |
428 |
|
|
} elsif ( defined( $pending->{$file}->{open} ) && $pending->{$file}->{open} == 1 ) { |
429 |
dpavlin |
5 |
my $path = $pending->{$file}->{path} || confess "no path for $file ? ", dump( $pending ); |
430 |
|
|
my $dest = fixup( $file ); |
431 |
dpavlin |
28 |
compress_path_dest( $path, $dest ); |
432 |
dpavlin |
5 |
|
433 |
dpavlin |
1 |
} else { |
434 |
|
|
warn "release $file, but still used ", $pending->{$file}->{open} , " times, delaying compression\n"; |
435 |
|
|
} |
436 |
dpavlin |
13 |
$pending->{$file}->{open}--; |
437 |
|
|
if ( $pending->{$file}->{open} == 0 ) { |
438 |
|
|
warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug; |
439 |
|
|
delete( $pending->{$file} ); |
440 |
|
|
} |
441 |
dpavlin |
1 |
return 0; |
442 |
|
|
} |
443 |
|
|
|
444 |
|
|
# kludge |
445 |
|
|
sub x_statfs {return 255,1000000,500000,1000000,500000,4096} |
446 |
|
|
Fuse::main( |
447 |
|
|
mountpoint=>$mount->{to}, |
448 |
|
|
getattr =>"main::x_getattr", |
449 |
|
|
readlink=>"main::x_readlink", |
450 |
|
|
getdir =>"main::x_getdir", |
451 |
|
|
mknod =>"main::x_mknod", |
452 |
|
|
mkdir =>"main::x_mkdir", |
453 |
|
|
unlink =>"main::x_unlink", |
454 |
|
|
rmdir =>"main::x_rmdir", |
455 |
|
|
symlink =>"main::x_symlink", |
456 |
|
|
rename =>"main::x_rename", |
457 |
|
|
link =>"main::x_link", |
458 |
|
|
chmod =>"main::x_chmod", |
459 |
|
|
chown =>"main::x_chown", |
460 |
|
|
truncate=>"main::x_truncate", |
461 |
|
|
utime =>"main::x_utime", |
462 |
|
|
open =>"main::x_open", |
463 |
|
|
read =>"main::x_read", |
464 |
|
|
write =>"main::x_write", |
465 |
|
|
statfs =>"main::x_statfs", |
466 |
|
|
release =>"main::x_release", |
467 |
|
|
# threaded=>1, |
468 |
dpavlin |
23 |
debug => $fuse_debug, |
469 |
dpavlin |
1 |
); |