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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 |
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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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dpavlin |
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my $stats = 1; |
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dpavlin |
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GetOptions( |
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'debug+' => \$debug, |
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'fuse-debug+' => \$fuse_debug, |
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dpavlin |
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'stats!' => \$stats, |
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dpavlin |
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); |
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dpavlin |
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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 |
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return "${name}.gz"; |
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} |
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return $name; |
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} |
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dpavlin |
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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 |
1 |
} |
60 |
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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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67 |
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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: $!"; |
112 |
dpavlin |
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warn ">> [", length($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: $!"; |
116 |
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"; |
122 |
dpavlin |
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undef $d; |
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undef $s; |
125 |
dpavlin |
1 |
} |
126 |
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127 |
dpavlin |
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sub tmp_path { |
128 |
dpavlin |
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my $file = shift; |
129 |
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130 |
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my $path = fixup( $file ); |
131 |
dpavlin |
29 |
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132 |
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my $op = 'UNKNOWN'; |
133 |
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134 |
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if (defined( $pending->{$file} )) { |
135 |
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$path = $pending->{$file}->{path} || confess "no path for $file in ",dump( $pending ); |
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$op = 'opened'; |
137 |
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} else { |
138 |
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my $tmp = $mount->{tmp} . '/' . $file; |
139 |
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if ( -e $tmp ) { |
140 |
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$path = $tmp; |
141 |
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$op = 'existing'; |
142 |
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} elsif ( $path =~ m/\.gz$/ ) { |
143 |
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my $dest_path = $tmp; |
144 |
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$dest_path =~ s!/[^/]+$!!; #!vim-fix |
145 |
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mkpath $dest_path unless -e $dest_path; |
146 |
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if ( -s $path ) { |
147 |
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file_copy( '<:gzip', $path, '>', $tmp ) |
148 |
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} else { |
149 |
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confess "ASSERT: filesystem corruption, $path is zero size\n"; |
150 |
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} |
151 |
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$path = $tmp; |
152 |
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$op = 'created'; |
153 |
dpavlin |
28 |
} |
154 |
dpavlin |
29 |
confess "ASSERT: path shouldn't exist for $file in ", dump( $pending ) if defined( $pending->{$file}->{path} ); |
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confess "ASSERT: open shouldn't exist for $file in ", dump( $pending ) if defined( $pending->{$file}->{open} ); |
156 |
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$pending->{$file}->{path} = $path; |
157 |
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$pending->{$file}->{open} = 0; # not really opened, just uncompressed |
158 |
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warn "## tmp_file( $file ) $op $path [", -s $path, "]\n"; |
159 |
dpavlin |
28 |
} |
160 |
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return $path; |
161 |
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} |
162 |
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163 |
dpavlin |
29 |
sub compress_file2path { |
164 |
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my ( $file, $path ) = @_; |
165 |
dpavlin |
28 |
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166 |
dpavlin |
29 |
my $dest = fixup( $file ); |
167 |
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168 |
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if ( defined($pending->{$file}) ) { |
169 |
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my $pending_path = $pending->{$file}->{path} || confess "no path for $file in ",dump( $pending ); |
170 |
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171 |
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if ( $pending->{$file}->{open} > 1 ) { |
172 |
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warn "$file used ", $pending->{$file}->{open}, " times, delaying compression\n"; |
173 |
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return; |
174 |
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} elsif ( ! $path ) { |
175 |
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$path = $pending_path; |
176 |
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} elsif ( $pending_path ne $path ) { |
177 |
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confess "ASSERT: compressing into $path instead of $pending_path\n"; |
178 |
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} |
179 |
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} |
180 |
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181 |
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confess "need path" unless $path; |
182 |
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183 |
dpavlin |
28 |
# cleanup old compressed copy |
184 |
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if ( $dest =~ /\.gz$/ ) { |
185 |
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warn "## remove old $dest\n"; |
186 |
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unlink $dest || confess "can't remove $dest: $!"; |
187 |
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$dest =~ s/\.gz$//; |
188 |
dpavlin |
29 |
confess "ASSERT: uncompressed $dest shouldn't exist!" if -e $dest; |
189 |
dpavlin |
28 |
} |
190 |
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191 |
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if ( $path =~ $skip_extensions_regex ) { |
192 |
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warn "$path [",-s $path,"] skipped compression\n"; |
193 |
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file_copy( '<', $path, '>', $dest ) if ( $path ne $dest ); |
194 |
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} elsif ( -s $path < $min_compress_size ) { |
195 |
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warn "$path [",-s $path,"] uncompressed, too small\n"; |
196 |
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file_copy( '<', $path, '>', $dest ) if ( $path ne $dest ); |
197 |
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} else { |
198 |
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warn "$path [",-s $path,"] compressing\n"; |
199 |
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200 |
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my $comp = $dest . '.gz'; |
201 |
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file_copy( '<', $path, '>:gzip', $comp ); |
202 |
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203 |
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my ( $size_path, $size_comp ) = ( -s $path, -s $comp ); |
204 |
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205 |
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if ( $size_path <= $size_comp ) { |
206 |
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warn ">>> $size_path <= $size_comp leaving uncompressed\n"; |
207 |
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unlink $comp || confess "can't remove: $comp: $!"; |
208 |
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} else { |
209 |
dpavlin |
29 |
warn ">>> compressed $size_path -> $size_comp ",int(($size_comp * 100) / $size_path),"% $comp\n"; |
210 |
dpavlin |
28 |
# FIXME add timeout to remove uncompressed version? |
211 |
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unlink $path || confess "can't remove $path: $!"; |
212 |
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} |
213 |
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} |
214 |
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} |
215 |
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216 |
dpavlin |
1 |
sub x_open { |
217 |
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my ($file) = shift; |
218 |
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my ($mode) = shift; |
219 |
dpavlin |
12 |
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220 |
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if ( $file eq '/.debug' ) { |
221 |
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my $path = $mount->{from} . '/.debug'; |
222 |
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open( my $debug, '>', $path ) || die "can't open $path: $!"; |
223 |
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my $dump = dump( $pending ); |
224 |
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print $debug "pending = $dump\n"; |
225 |
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close($debug); |
226 |
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$pending->{'/.debug'}->{path} = $path; |
227 |
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warn "## created dump $path $dump\n"; |
228 |
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return 0; |
229 |
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} |
230 |
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231 |
dpavlin |
8 |
my $mode_desc = { |
232 |
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rdonly => $mode && O_RDONLY, |
233 |
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rdwr => $mode && O_RDWR, |
234 |
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append => $mode && O_APPEND, |
235 |
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create => $mode && O_CREAT, |
236 |
dpavlin |
14 |
trunc => $mode && O_TRUNC, |
237 |
dpavlin |
8 |
}; |
238 |
dpavlin |
28 |
|
239 |
dpavlin |
29 |
my $path = tmp_path( $file ); |
240 |
dpavlin |
28 |
|
241 |
dpavlin |
19 |
warn "## open( $file, $mode ) pending: ", $pending->{$file}->{open}, " mode $mode: ", dump( $mode_desc )," $path [", -s $path, "]\n" if $debug; |
242 |
dpavlin |
28 |
|
243 |
dpavlin |
1 |
my $fh; |
244 |
dpavlin |
8 |
|
245 |
dpavlin |
21 |
if ( sysopen($fh , $path, $mode) ) { |
246 |
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close($fh) || confess "can't close $path: $!"; |
247 |
dpavlin |
29 |
warn "<<< sysopen $path [", -e $path ? -s $path : 'new' , "]\n"; |
248 |
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$pending->{$file}->{open}++; |
249 |
dpavlin |
21 |
return 0; |
250 |
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} else { |
251 |
dpavlin |
26 |
warn "ERROR: can't open $path -- $!"; |
252 |
dpavlin |
21 |
return -$!; |
253 |
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} |
254 |
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255 |
dpavlin |
1 |
} |
256 |
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257 |
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sub x_read { |
258 |
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my ($file,$bufsize,$off) = @_; |
259 |
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my ($rv) = -ENOSYS(); |
260 |
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my $path = fixup( $file ); |
261 |
dpavlin |
10 |
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262 |
dpavlin |
12 |
confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} ); |
263 |
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264 |
dpavlin |
1 |
return -ENOENT() unless -e $path; |
265 |
dpavlin |
10 |
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266 |
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my $fh = new IO::File; |
267 |
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return -ENOSYS() unless open($fh,$pending->{$file}->{path}); |
268 |
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269 |
dpavlin |
1 |
if(seek($fh,$off,SEEK_SET)) { |
270 |
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read($fh,$rv,$bufsize); |
271 |
dpavlin |
29 |
$pending->{$file}->{read} += length($rv) if $stats; |
272 |
dpavlin |
1 |
} |
273 |
dpavlin |
10 |
|
274 |
dpavlin |
1 |
return $rv; |
275 |
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} |
276 |
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277 |
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sub x_write { |
278 |
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my ($file,$buf,$off) = @_; |
279 |
dpavlin |
25 |
|
280 |
dpavlin |
10 |
my $rv; |
281 |
dpavlin |
1 |
my $path = fixup($file); |
282 |
dpavlin |
10 |
|
283 |
dpavlin |
12 |
confess "no pending file $file ", dump( $pending ) unless defined( $pending->{$file} ); |
284 |
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285 |
dpavlin |
1 |
return -ENOENT() unless -e $path; |
286 |
dpavlin |
10 |
|
287 |
dpavlin |
26 |
$path = $pending->{$file}->{path} || confess "no path for $file in ", dump( $pending ); |
288 |
dpavlin |
29 |
confess "write into non-existant $path for $file" unless -e $path; |
289 |
dpavlin |
26 |
|
290 |
dpavlin |
10 |
my $fh = new IO::File; |
291 |
dpavlin |
26 |
return -ENOSYS() unless open($fh,'+<',$path); |
292 |
dpavlin |
1 |
if($rv = seek( $fh ,$off,SEEK_SET)) { |
293 |
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$rv = print( $fh $buf ); |
294 |
dpavlin |
29 |
my $size = length($buf); |
295 |
|
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warn "## write $path offset $off [$size]\n" if $debug; |
296 |
|
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$pending->{$file}->{write} += $size; |
297 |
dpavlin |
1 |
} |
298 |
|
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$rv = -ENOSYS() unless $rv; |
299 |
dpavlin |
26 |
close($fh) || warn "can't close $path: $!"; |
300 |
dpavlin |
1 |
return length($buf); |
301 |
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} |
302 |
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303 |
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sub err { return (-shift || -$!) } |
304 |
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305 |
dpavlin |
27 |
sub x_readlink { return readlink(fixup(shift)); } |
306 |
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|
307 |
dpavlin |
25 |
sub x_unlink { |
308 |
|
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my $file = shift; |
309 |
|
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my $path = fixup( $file ); |
310 |
dpavlin |
1 |
|
311 |
dpavlin |
25 |
if ( $file =~ m#\Q/.fuse_hidden\E# ) { |
312 |
|
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return unlink $path ? 0 : -$1; |
313 |
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} |
314 |
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315 |
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warn "# unlink( $file )\n"; |
316 |
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317 |
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unlink $path || return 0; |
318 |
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319 |
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my $tmp = $mount->{tmp} . '/' . $file; |
320 |
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unlink $tmp if ( -e $tmp ); |
321 |
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322 |
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delete( $pending->{$file} ); |
323 |
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return 0; |
324 |
|
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} |
325 |
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|
326 |
dpavlin |
27 |
sub x_symlink { |
327 |
|
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my ($from,$to) = @_; |
328 |
dpavlin |
1 |
|
329 |
dpavlin |
27 |
my $from_path = $from; #fixup( $from ); |
330 |
|
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my $to_path = fixup( $to ); |
331 |
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332 |
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my $rv = symlink( $from_path, $to_path ) ? 0 : -$!; |
333 |
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warn "# symlink( $from_path -> $to_path ) = $rv\n" if $debug; |
334 |
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|
335 |
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my $tmp = $mount->{tmp} . '/' . $from; |
336 |
|
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if ( -e $tmp ) { |
337 |
|
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my $tmp_to = $mount->{$tmp} . '/' . $to; |
338 |
|
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symlink( $tmp, $tmp_to ) || confess "can't symlink $tmp -> $tmp_to: $!"; |
339 |
|
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} |
340 |
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return $rv; |
341 |
|
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} |
342 |
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343 |
|
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sub x_link { |
344 |
|
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my ($from,$to) = @_; |
345 |
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|
346 |
|
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my $from_path = fixup($from); |
347 |
|
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my $to_path = fixup($to); |
348 |
|
|
$to_path .= '.gz' if ( $from_path =~ m/\.gz$/ && $to_path !~ m/\.gz$/ ); |
349 |
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|
350 |
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my $rv = link( $from_path, $to_path ) ? 0 : -$!; |
351 |
|
|
|
352 |
|
|
warn "# link( $from_path -> $to_path ) = $rv\n" if $debug; |
353 |
|
|
|
354 |
|
|
return $rv; |
355 |
|
|
} |
356 |
|
|
|
357 |
dpavlin |
1 |
sub x_rename { |
358 |
dpavlin |
18 |
my ($old,$new) = @_; |
359 |
|
|
my $old_path = fixup($old); |
360 |
|
|
my $new_path = fixup($new); |
361 |
|
|
$new_path .= '.gz' if ( $old_path =~ m/\.gz$/ && $new_path !~ m/\.gz$/ ); |
362 |
|
|
|
363 |
|
|
my $err = rename($old_path,$new_path) ? 0 : -ENOENT(); |
364 |
|
|
warn "## rename( $old_path => $new_path ) = $err\n"; |
365 |
|
|
|
366 |
|
|
my $tmp = $mount->{tmp} . '/' . $old; |
367 |
|
|
if ( -e $tmp ) { |
368 |
dpavlin |
25 |
if ( $new =~ m#\Q/.fuse_hidden\E# ) { |
369 |
|
|
unlink $tmp || confess "can't unlink $tmp for $new\n"; |
370 |
|
|
} else { |
371 |
|
|
my $new_tmp = $mount->{tmp} . '/' . $new; |
372 |
|
|
rename $tmp, $new_tmp || confess "can't rename $tmp -> $new_tmp : $!"; |
373 |
|
|
} |
374 |
dpavlin |
18 |
} |
375 |
|
|
|
376 |
dpavlin |
20 |
if (defined( $pending->{$old} )) { |
377 |
|
|
$pending->{$new} = $pending->{$old}; |
378 |
|
|
|
379 |
|
|
my $path = $pending->{$old}->{path}; |
380 |
|
|
$path =~ s/\Q$old\E/$new/; |
381 |
|
|
$pending->{$new}->{path} = $path; |
382 |
|
|
|
383 |
dpavlin |
25 |
delete( $pending->{$old} ); |
384 |
|
|
warn "## tweaking pending to ", dump( $pending ) if $debug; |
385 |
dpavlin |
20 |
} |
386 |
|
|
|
387 |
dpavlin |
1 |
return $err; |
388 |
|
|
} |
389 |
|
|
|
390 |
|
|
sub x_chown { |
391 |
dpavlin |
26 |
my ($file,$uid,$gid) = @_; |
392 |
|
|
my $path = fixup($file); |
393 |
dpavlin |
1 |
print "nonexistent $path\n" unless -e $path; |
394 |
|
|
# perl's chown() does not chown symlinks, it chowns the symlink's |
395 |
|
|
# target. it fails when the link's target doesn't exist, because |
396 |
|
|
# the stat64() syscall fails. |
397 |
|
|
# this causes error messages when unpacking symlinks in tarballs. |
398 |
|
|
my ($err) = syscall(&SYS_lchown,$path,$uid,$gid,$path) ? -$! : 0; |
399 |
dpavlin |
26 |
|
400 |
|
|
my $tmp = $mount->{tmp} . '/' . $file; |
401 |
|
|
syscall(&SYS_lchown,$file,$uid,$gid,$path) if -e $tmp; |
402 |
|
|
|
403 |
dpavlin |
1 |
return $err; |
404 |
|
|
} |
405 |
|
|
|
406 |
|
|
sub x_chmod { |
407 |
|
|
my ($path) = fixup(shift); |
408 |
|
|
my ($mode) = shift; |
409 |
|
|
my ($err) = chmod($mode,$path) ? 0 : -$!; |
410 |
|
|
return $err; |
411 |
|
|
} |
412 |
|
|
|
413 |
dpavlin |
14 |
sub x_truncate { |
414 |
|
|
my ( $file,$size ) = @_; |
415 |
dpavlin |
28 |
|
416 |
|
|
#confess "no pending file $file to truncate in ", dump( $pending ) unless defined( $pending->{$file} ); |
417 |
|
|
|
418 |
dpavlin |
29 |
my $path = tmp_path( $file ); |
419 |
dpavlin |
14 |
my $rv = truncate( $path, $size ) ? 0 : -$! ; |
420 |
dpavlin |
21 |
warn "## truncate( $file $size ) $path [", -s $path, "] = $rv\n" if $debug; |
421 |
dpavlin |
29 |
compress_file2path( $file, $path ); |
422 |
dpavlin |
27 |
|
423 |
dpavlin |
14 |
return $rv; |
424 |
|
|
} |
425 |
dpavlin |
28 |
|
426 |
dpavlin |
1 |
sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; } |
427 |
|
|
|
428 |
|
|
sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; } |
429 |
|
|
sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; } |
430 |
|
|
|
431 |
|
|
sub x_mknod { |
432 |
|
|
# since this is called for ALL files, not just devices, I'll do some checks |
433 |
|
|
# and possibly run the real mknod command. |
434 |
|
|
my ($file, $modes, $dev) = @_; |
435 |
|
|
$file = fixup($file); |
436 |
|
|
$! = 0; |
437 |
|
|
syscall(&SYS_mknod,$file,$modes,$dev); |
438 |
|
|
return -$!; |
439 |
|
|
} |
440 |
|
|
|
441 |
|
|
sub x_release { |
442 |
|
|
my ( $file, $mode ) = @_; |
443 |
dpavlin |
25 |
|
444 |
dpavlin |
1 |
if ( ! defined( $pending->{$file} ) ) { |
445 |
|
|
warn "release $file, NO PENDING DATA\n"; |
446 |
|
|
return 0; |
447 |
|
|
} elsif ( ! defined( $pending->{$file}->{write} ) ) { |
448 |
|
|
warn "release $file, not written into\n"; |
449 |
dpavlin |
29 |
} elsif ( $file =~ m#\Q/.fuse_hidden\E# ) { |
450 |
|
|
warn "release internal $file\n" if $debug; |
451 |
dpavlin |
1 |
} else { |
452 |
dpavlin |
29 |
compress_file2path( $file ); |
453 |
dpavlin |
1 |
} |
454 |
dpavlin |
29 |
|
455 |
dpavlin |
13 |
$pending->{$file}->{open}--; |
456 |
|
|
if ( $pending->{$file}->{open} == 0 ) { |
457 |
|
|
warn "## cleanup pending $file [", -s fixup($file), "]\n" if $debug; |
458 |
|
|
delete( $pending->{$file} ); |
459 |
|
|
} |
460 |
dpavlin |
29 |
|
461 |
dpavlin |
1 |
return 0; |
462 |
|
|
} |
463 |
|
|
|
464 |
|
|
# kludge |
465 |
|
|
sub x_statfs {return 255,1000000,500000,1000000,500000,4096} |
466 |
|
|
Fuse::main( |
467 |
|
|
mountpoint=>$mount->{to}, |
468 |
|
|
getattr =>"main::x_getattr", |
469 |
|
|
readlink=>"main::x_readlink", |
470 |
|
|
getdir =>"main::x_getdir", |
471 |
|
|
mknod =>"main::x_mknod", |
472 |
|
|
mkdir =>"main::x_mkdir", |
473 |
|
|
unlink =>"main::x_unlink", |
474 |
|
|
rmdir =>"main::x_rmdir", |
475 |
|
|
symlink =>"main::x_symlink", |
476 |
|
|
rename =>"main::x_rename", |
477 |
|
|
link =>"main::x_link", |
478 |
|
|
chmod =>"main::x_chmod", |
479 |
|
|
chown =>"main::x_chown", |
480 |
|
|
truncate=>"main::x_truncate", |
481 |
|
|
utime =>"main::x_utime", |
482 |
|
|
open =>"main::x_open", |
483 |
|
|
read =>"main::x_read", |
484 |
|
|
write =>"main::x_write", |
485 |
|
|
statfs =>"main::x_statfs", |
486 |
|
|
release =>"main::x_release", |
487 |
|
|
# threaded=>1, |
488 |
dpavlin |
23 |
debug => $fuse_debug, |
489 |
dpavlin |
1 |
); |