/[fuse_dbi]/fuse-couchdb/DBI.pm
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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revision 26 by dpavlin, Fri Oct 8 22:55:36 2004 UTC revision 62 by dpavlin, Wed Aug 2 21:53:30 2006 UTC
# Line 12  use DBI; Line 12  use DBI;
12  use Carp;  use Carp;
13  use Data::Dumper;  use Data::Dumper;
14    
15    our $VERSION = '0.09_1';
16    
17  our $VERSION = '0.03';  # block size for this filesystem
18    use constant BLOCK => 1024;
19    
20  =head1 NAME  =head1 NAME
21    
# Line 24  Fuse::DBI - mount your database as files Line 26  Fuse::DBI - mount your database as files
26    use Fuse::DBI;    use Fuse::DBI;
27    Fuse::DBI->mount( ... );    Fuse::DBI->mount( ... );
28    
29  See C<run> below for examples how to set parametars.  See C<run> below for examples how to set parameters.
30    
31  =head1 DESCRIPTION  =head1 DESCRIPTION
32    
33  This module will use C<Fuse> module, part of C<FUSE (Filesystem in USErspace)>  This module will use C<Fuse> module, part of C<FUSE (Filesystem in USErspace)>
34  available at L<http://sourceforge.net/projects/avf> to mount  available at L<http://fuse.sourceforge.net/> to mount
35  your database as file system.  your database as file system.
36    
37  That will give you posibility to use normal file-system tools (cat, grep, vi)  That will give you possibility to use normal file-system tools (cat, grep, vi)
38  to manipulate data in database.  to manipulate data in database.
39    
40  It's actually opposite of Oracle's intention to put everything into database.  It's actually opposite of Oracle's intention to put everything into database.
# Line 46  It's actually opposite of Oracle's inten Line 48  It's actually opposite of Oracle's inten
48    
49  Mount your database as filesystem.  Mount your database as filesystem.
50    
51    Let's suppose that your database have table C<files> with following structure:
52    
53     id:            int
54     filename:      text
55     size:          int
56     content:       text
57     writable:      boolean
58    
59    Following is example how to mount table like that to C</mnt>:
60    
61    my $mnt = Fuse::DBI->mount({    my $mnt = Fuse::DBI->mount({
62          filenames => 'select name from files_table as filenames',          'filenames' => 'select id,filename,size,writable from files',
63          read => 'sql read',          'read' => 'select content from files where id = ?',
64          update => 'sql update',          'update' => 'update files set content = ? where id = ?',
65          dsn => 'DBI:Pg:dbname=webgui',          'dsn' => 'DBI:Pg:dbname=test_db',
66          user => 'database_user',          'user' => 'database_user',
67          password => 'database_password'          'password' => 'database_password',
68            'invalidate' => sub { ... },
69      });
70    
71    Options:
72    
73    =over 5
74    
75    =item filenames
76    
77    SQL query which returns C<id> (unique id for that row), C<filename>,
78    C<size> and C<writable> boolean flag.
79    
80    =item read
81    
82    SQL query which returns only one column with content of file and has
83    placeholder C<?> for C<id>.
84    
85    =item update
86    
87    SQL query with two pace-holders, one for new content and one for C<id>.
88    
89    =item dsn
90    
91    C<DBI> dsn to connect to (contains database driver and name of database).
92    
93    =item user
94    
95    User with which to connect to database
96    
97    =item password
98    
99    Password for connecting to database
100    
101    =item invalidate
102    
103    Optional anonymous code reference which will be executed when data is updated in
104    database. It can be used as hook to delete cache (for example on-disk-cache)
105    which is created from data edited through C<Fuse::DBI>.
106    
107    =item fork
108    
109    Optional flag which forks after mount so that executing script will continue
110    running. Implementation is experimental.
111    
112    =back
113    
114    There is also alternative way which can generate C<read> and C<update>
115    queries on the fly:
116    
117      my $mnt = Fuse::DBI->mount({
118            'filenames' => 'select id,filename,size,writable from files',
119            'read' => sub {
120                    my ($path,$file) = @_;
121                    return( 'select content from files where id = ?', $file->{row}->{id} );
122            },
123            'update' => sub {
124                    my ($path,$file) = @_;
125                    return( 'update files set content = ? where id = ?', $file->{row}->{id} );
126            },
127            'dsn' => 'DBI:Pg:dbname=test_db',
128            'user' => 'database_user',
129            'password' => 'database_password',
130            'invalidate' => sub { ... },
131    });    });
132    
133  =cut  =cut
# Line 78  sub mount { Line 153  sub mount {
153    
154          print Dumper($arg);          print Dumper($arg);
155    
156            unless ($self->fuse_module_loaded) {
157                    print STDERR "no fuse module loaded. Trying sudo modprobe fuse!\n";
158                    system "sudo modprobe fuse" || die "can't modprobe fuse using sudo!\n";
159            }
160    
161          carp "mount needs 'dsn' to connect to (e.g. dsn => 'DBI:Pg:dbname=test')" unless ($arg->{'dsn'});          carp "mount needs 'dsn' to connect to (e.g. dsn => 'DBI:Pg:dbname=test')" unless ($arg->{'dsn'});
162          carp "mount needs 'mount' as mountpoint" unless ($arg->{'mount'});          carp "mount needs 'mount' as mountpoint" unless ($arg->{'mount'});
163    
# Line 98  sub mount { Line 178  sub mount {
178                  die "fork() failed: $!" unless defined $pid;                  die "fork() failed: $!" unless defined $pid;
179                  # child will return to caller                  # child will return to caller
180                  if ($pid) {                  if ($pid) {
181                          return $self;                          my $counter = 4;
182                            while ($counter && ! $self->is_mounted) {
183                                    select(undef, undef, undef, 0.5);
184                                    $counter--;
185                            }
186                            if ($self->is_mounted) {
187                                    return $self;
188                            } else {
189                                    return undef;
190                            }
191                  }                  }
192          }          }
193    
# Line 106  sub mount { Line 195  sub mount {
195    
196          $sth->{'filenames'} = $dbh->prepare($arg->{'filenames'}) || die $dbh->errstr();          $sth->{'filenames'} = $dbh->prepare($arg->{'filenames'}) || die $dbh->errstr();
197    
         $sth->{'read'} = $dbh->prepare($arg->{'read'}) || die $dbh->errstr();  
         $sth->{'update'} = $dbh->prepare($arg->{'update'}) || die $dbh->errstr();  
   
198    
199          $self->{'sth'} = $sth;          $self->{'sth'} = $sth;
200    
201          $self->{'read_filenames'} = sub { $self->read_filenames };          $self->{'read_filenames'} = sub { $self->read_filenames };
202          $self->read_filenames;          $self->read_filenames;
203    
204          $self->{'mounted'} = 1;          foreach my $op (qw/read update/) {
205                    if (ref($arg->{ $op }) ne 'CODE') {
206                            $self->{ $op . '_ref' } = sub {
207                                    my $row = shift;
208                                    return ($arg->{ $op }, $row->{'id'});
209                            }
210                    } else {
211                            $self->{ $op . '_ref' } = $arg->{ $op };
212                    }
213            }
214    
215          $fuse_self = \$self;          $fuse_self = \$self;
216    
# Line 131  sub mount { Line 226  sub mount {
226                  truncate=>\&e_truncate,                  truncate=>\&e_truncate,
227                  unlink=>\&e_unlink,                  unlink=>\&e_unlink,
228                  rmdir=>\&e_unlink,                  rmdir=>\&e_unlink,
229                  debug=>0,                  debug=>1,
230          );          );
231                    
         $self->{'mounted'} = 0;  
   
232          exit(0) if ($arg->{'fork'});          exit(0) if ($arg->{'fork'});
233    
234          return 1;          return 1;
235    
236  };  };
237    
238    =head2 is_mounted
239    
240    Check if fuse filesystem is mounted
241    
242      if ($mnt->is_mounted) { ... }
243    
244    =cut
245    
246    sub is_mounted {
247            my $self = shift;
248    
249            my $mounted = 0;
250            my $mount = $self->{'mount'} || confess "can't find mount point!";
251            if (open(MTAB, "/etc/mtab")) {
252                    while(<MTAB>) {
253                            $mounted = 1 if (/ $mount fuse /i);
254                    }
255                    close(MTAB);
256            } else {
257                    warn "can't open /etc/mtab: $!";
258            }
259    
260            return $mounted;
261    }
262    
263    
264  =head2 umount  =head2 umount
265    
266  Unmount your database as filesystem.  Unmount your database as filesystem.
# Line 156  database to filesystem. Line 275  database to filesystem.
275  sub umount {  sub umount {
276          my $self = shift;          my $self = shift;
277    
278          if ($self->{'mounted'}) {          if ($self->{'mount'} && $self->is_mounted) {
279                  system "fusermount -u ".$self->{'mount'} || croak "umount error: $!";                  system "( fusermount -u ".$self->{'mount'}." 2>&1 ) >/dev/null";
280                    if ($self->is_mounted) {
281                            system "sudo umount ".$self->{'mount'} ||
282                            return 0;
283                    }
284                    return 1;
285          }          }
286    
287          return 1;          return 0;
288  }  }
289    
290  $SIG{'INT'} = sub {  $SIG{'INT'} = sub {
291          print STDERR "umount called by SIG INT\n";          if ($fuse_self && $$fuse_self->umount) {
292          umount;                  print STDERR "umount called by SIG INT\n";
293            }
294    };
295    
296    $SIG{'QUIT'} = sub {
297            if ($fuse_self && $$fuse_self->umount) {
298                    print STDERR "umount called by SIG QUIT\n";
299            }
300  };  };
301    
302  sub DESTROY {  sub DESTROY {
303          my $self = shift;          my $self = shift;
304          return if (! $self->{'mounted'});          if ($self->umount) {
305          print STDERR "umount called by DESTROY\n";                  print STDERR "umount called by DESTROY\n";
306          $self->umount;          }
307  }  }
308    
309  =head2 fuse_module_loaded  =head2 fuse_module_loaded
# Line 182  Checks if C<fuse> module is loaded in ke Line 313  Checks if C<fuse> module is loaded in ke
313    die "no fuse module loaded in kernel"    die "no fuse module loaded in kernel"
314          unless (Fuse::DBI::fuse_module_loaded);          unless (Fuse::DBI::fuse_module_loaded);
315    
316  This function in called by L<mount>, but might be useful alone also.  This function in called by C<mount>, but might be useful alone also.
317    
318  =cut  =cut
319    
# Line 196  sub fuse_module_loaded { Line 327  sub fuse_module_loaded {
327          }          }
328  }  }
329    
330  my %files;  my $files;
 my %dirs;  
331    
332  sub read_filenames {  sub read_filenames {
333          my $self = shift;          my $self = shift;
# Line 205  sub read_filenames { Line 335  sub read_filenames {
335          my $sth = $self->{'sth'} || die "no sth argument";          my $sth = $self->{'sth'} || die "no sth argument";
336    
337          # create empty filesystem          # create empty filesystem
338          (%files) = (          $files = {
339                  '.' => {                  '.' => {
340                          type => 0040,                          type => 0040,
341                          mode => 0755,                          mode => 0755,
342                  },                  },
343                    '..' => {
344                            type => 0040,
345                            mode => 0755,
346                    },
347          #       a => {          #       a => {
348          #               cont => "File 'a'.\n",          #               cont => "File 'a'.\n",
349          #               type => 0100,          #               type => 0100,
350          #               ctime => time()-2000          #               ctime => time()-2000
351          #       },          #       },
352          );          };
353    
354          # fetch new filename list from database          # fetch new filename list from database
355          $sth->{'filenames'}->execute() || die $sth->{'filenames'}->errstr();          $sth->{'filenames'}->execute() || die $sth->{'filenames'}->errstr();
356    
357          # read them in with sesible defaults          # read them in with sesible defaults
358          while (my $row = $sth->{'filenames'}->fetchrow_hashref() ) {          while (my $row = $sth->{'filenames'}->fetchrow_hashref() ) {
359                  $files{$row->{'filename'}} = {                  $row->{'filename'} ||= 'NULL-'.$row->{'id'};
360                    $files->{$row->{'filename'}} = {
361                          size => $row->{'size'},                          size => $row->{'size'},
362                          mode => $row->{'writable'} ? 0644 : 0444,                          mode => $row->{'writable'} ? 0644 : 0444,
363                          id => $row->{'id'} || 99,                          id => $row->{'id'} || undef,
364                            row => $row,
365                  };                  };
366    
367    
368                  my $d;                  my $d;
369                  foreach (split(m!/!, $row->{'filename'})) {                  foreach (split(m!/!, $row->{'filename'})) {
370                          # first, entry is assumed to be file                          # first, entry is assumed to be file
371                          if ($d) {                          if ($d) {
372                                  $files{$d} = {                                  $files->{$d} = {
                                                 size => $dirs{$d}++,  
373                                                  mode => 0755,                                                  mode => 0755,
374                                                  type => 0040                                                  type => 0040
375                                  };                                  };
376                                  $files{$d.'/.'} = {                                  $files->{$d.'/.'} = {
377                                                  mode => 0755,                                                  mode => 0755,
378                                                  type => 0040                                                  type => 0040
379                                  };                                  };
380                                  $files{$d.'/..'} = {                                  $files->{$d.'/..'} = {
381                                                  mode => 0755,                                                  mode => 0755,
382                                                  type => 0040                                                  type => 0040
383                                  };                                  };
# Line 251  sub read_filenames { Line 387  sub read_filenames {
387                  }                  }
388          }          }
389    
390          print "found ",scalar(keys %files)-scalar(keys %dirs)," files, ",scalar(keys %dirs), " dirs\n";          print "found ",scalar(keys %{$files})," files\n";
391  }  }
392    
393    
# Line 266  sub e_getattr { Line 402  sub e_getattr {
402          my ($file) = filename_fixup(shift);          my ($file) = filename_fixup(shift);
403          $file =~ s,^/,,;          $file =~ s,^/,,;
404          $file = '.' unless length($file);          $file = '.' unless length($file);
405          return -ENOENT() unless exists($files{$file});          return -ENOENT() unless exists($files->{$file});
406          my ($size) = $files{$file}{size} || 1;          my ($size) = $files->{$file}->{size} || 0;
407          my ($dev, $ino, $rdev, $blocks, $gid, $uid, $nlink, $blksize) = (0,0,0,1,0,0,1,1024);          my ($dev, $ino, $rdev, $blocks, $gid, $uid, $nlink, $blksize) = (0,0,0,int(($size+BLOCK-1)/BLOCK),0,0,1,BLOCK);
408          my ($atime, $ctime, $mtime);          my ($atime, $ctime, $mtime);
409          $atime = $ctime = $mtime = $files{$file}{ctime} || $ctime_start;          $atime = $ctime = $mtime = $files->{$file}->{ctime} || $ctime_start;
410    
411          my ($modes) = (($files{$file}{type} || 0100)<<9) + $files{$file}{mode};          my ($modes) = (($files->{$file}->{type} || 0100)<<9) + $files->{$file}->{mode};
412    
413          # 2 possible types of return values:          # 2 possible types of return values:
414          #return -ENOENT(); # or any other error you care to          #return -ENOENT(); # or any other error you care to
415          #print(join(",",($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks)),"\n");          #print "getattr($file) ",join(",",($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks)),"\n";
416          return ($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks);          return ($dev,$ino,$modes,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks);
417  }  }
418    
# Line 284  sub e_getdir { Line 420  sub e_getdir {
420          my ($dirname) = shift;          my ($dirname) = shift;
421          $dirname =~ s!^/!!;          $dirname =~ s!^/!!;
422          # return as many text filenames as you like, followed by the retval.          # return as many text filenames as you like, followed by the retval.
423          print((scalar keys %files)." files total\n");          print((scalar keys %{$files})." files total\n");
424          my %out;          my %out;
425          foreach my $f (sort keys %files) {          foreach my $f (sort keys %{$files}) {
426                  if ($dirname) {                  if ($dirname) {
427                          if ($f =~ s/^\E$dirname\Q\///) {                          if ($f =~ s/^\Q$dirname\E\///) {
428                                  $out{$f}++ if ($f =~ /^[^\/]+$/);                                  $out{$f}++ if ($f =~ /^[^\/]+$/);
429                          }                          }
430                  } else {                  } else {
# Line 304  sub e_getdir { Line 440  sub e_getdir {
440  }  }
441    
442  sub read_content {  sub read_content {
443          my ($file,$id) = @_;          my $file = shift || die "need file";
444    
445            warn "file: $file\n", Dumper($fuse_self);
446    
447            my @args = $$fuse_self->{'read_ref'}->($files->{$file});
448            my $sql = shift @args || die "need SQL for $file";
449    
450          die "read_content needs file and id" unless ($file && $id);          $$fuse_self->{'read_sth'}->{$sql} ||= $$fuse_self->{sth}->prepare($sql) || die $dbh->errstr();
451            my $sth = $$fuse_self->{'read_sth'}->{$sql} || die;
452    
453          $sth->{'read'}->execute($id) || die $sth->{'read'}->errstr;          $sth->execute(@args) || die $sth->errstr;
454          $files{$file}{cont} = $sth->{'read'}->fetchrow_array;          $files->{$file}->{cont} = $sth->fetchrow_array;
455          $files{$file}{ctime} = time();          # I should modify ctime only if content in database changed
456          print "file '$file' content [",length($files{$file}{cont})," bytes] read in cache\n";          #$files->{$file}->{ctime} = time() unless ($files->{$file}->{ctime});
457            print "file '$file' content [",length($files->{$file}->{cont})," bytes] read in cache\n";
458  }  }
459    
460    
# Line 320  sub e_open { Line 463  sub e_open {
463          my $file = filename_fixup(shift);          my $file = filename_fixup(shift);
464          my $flags = shift;          my $flags = shift;
465    
466          return -ENOENT() unless exists($files{$file});          return -ENOENT() unless exists($files->{$file});
467          return -EISDIR() unless exists($files{$file}{id});          return -EISDIR() unless exists($files->{$file}->{id});
468    
469          read_content($file,$files{$file}{id}) unless exists($files{$file}{cont});          read_content($file,$files->{$file}->{id}) unless exists($files->{$file}->{cont});
470    
471          print "open '$file' ",length($files{$file}{cont})," bytes\n";          $files->{$file}->{cont} ||= '';
472            print "open '$file' ",length($files->{$file}->{cont})," bytes\n";
473          return 0;          return 0;
474  }  }
475    
# Line 336  sub e_read { Line 480  sub e_read {
480          my ($file) = filename_fixup(shift);          my ($file) = filename_fixup(shift);
481          my ($buf_len,$off) = @_;          my ($buf_len,$off) = @_;
482    
483          return -ENOENT() unless exists($files{$file});          return -ENOENT() unless exists($files->{$file});
484    
485          my $len = length($files{$file}{cont});          my $len = length($files->{$file}->{cont});
486    
487          print "read '$file' [$len bytes] offset $off length $buf_len\n";          print "read '$file' [$len bytes] offset $off length $buf_len\n";
488    
# Line 347  sub e_read { Line 491  sub e_read {
491    
492          $buf_len = $len-$off if ($len - $off < $buf_len);          $buf_len = $len-$off if ($len - $off < $buf_len);
493    
494          return substr($files{$file}{cont},$off,$buf_len);          return substr($files->{$file}->{cont},$off,$buf_len);
495  }  }
496    
497  sub clear_cont {  sub clear_cont {
498          print "transaction rollback\n";          print "transaction rollback\n";
499          $dbh->rollback || die $dbh->errstr;          $dbh->rollback || die $dbh->errstr;
500          print "invalidate all cached content\n";          print "invalidate all cached content\n";
501          foreach my $f (keys %files) {          foreach my $f (keys %{$files}) {
502                  delete $files{$f}{cont};                  delete $files->{$f}->{cont};
503                    delete $files->{$f}->{ctime};
504          }          }
505          print "begin new transaction\n";          print "begin new transaction\n";
506          #$dbh->begin_work || die $dbh->errstr;          #$dbh->begin_work || die $dbh->errstr;
# Line 363  sub clear_cont { Line 508  sub clear_cont {
508    
509    
510  sub update_db {  sub update_db {
511          my $file = shift || die;          my $file = shift || die "need file";
512    
513          $files{$file}{ctime} = time();          $files->{$file}->{ctime} = time();
514    
515          my ($cont,$id) = (          my ($cont,$id) = (
516                  $files{$file}{cont},                  $files->{$file}->{cont},
517                  $files{$file}{id}                  $files->{$file}->{id}
518          );          );
519    
520          if (!$sth->{'update'}->execute($cont,$id)) {          my @args = $$fuse_self->{'update_ref'}->($files->{$file});
521                  print "update problem: ",$sth->{'update'}->errstr;          my $sql = shift @args || die "need SQL for $file";
522    
523            my $sth = $$fuse_self->{'update_sth'}->{$sql}
524                    ||= $$fuse_self->{sth}->prepare($sql)
525                    || die $dbh->errstr();
526    
527            if (!$sth->execute(@args)) {
528                    print "update problem: ",$sth->errstr;
529                  clear_cont;                  clear_cont;
530                  return 0;                  return 0;
531          } else {          } else {
532                  if (! $dbh->commit) {                  if (! $dbh->commit) {
533                          print "ERROR: commit problem: ",$sth->{'update'}->errstr;                          print "ERROR: commit problem: ",$sth->errstr;
534                          clear_cont;                          clear_cont;
535                          return 0;                          return 0;
536                  }                  }
537                  print "updated '$file' [",$files{$file}{id},"]\n";                  print "updated '$file' [",$files->{$file}->{id},"]\n";
538    
539                  $$fuse_self->{'invalidate'}->() if (ref $$fuse_self->{'invalidate'});                  $$fuse_self->{'invalidate'}->() if (ref $$fuse_self->{'invalidate'});
540          }          }
# Line 393  sub e_write { Line 545  sub e_write {
545          my $file = filename_fixup(shift);          my $file = filename_fixup(shift);
546          my ($buffer,$off) = @_;          my ($buffer,$off) = @_;
547    
548          return -ENOENT() unless exists($files{$file});          return -ENOENT() unless exists($files->{$file});
549    
550          my $cont = $files{$file}{cont};          my $cont = $files->{$file}->{cont};
551          my $len = length($cont);          my $len = length($cont);
552    
553          print "write '$file' [$len bytes] offset $off length ",length($buffer),"\n";          print "write '$file' [$len bytes] offset $off length ",length($buffer),"\n";
554    
555          $files{$file}{cont} = "";          $files->{$file}->{cont} = "";
556    
557          $files{$file}{cont} .= substr($cont,0,$off) if ($off > 0);          $files->{$file}->{cont} .= substr($cont,0,$off) if ($off > 0);
558          $files{$file}{cont} .= $buffer;          $files->{$file}->{cont} .= $buffer;
559          $files{$file}{cont} .= substr($cont,$off+length($buffer),$len-$off-length($buffer)) if ($off+length($buffer) < $len);          $files->{$file}->{cont} .= substr($cont,$off+length($buffer),$len-$off-length($buffer)) if ($off+length($buffer) < $len);
560    
561          $files{$file}{size} = length($files{$file}{cont});          $files->{$file}->{size} = length($files->{$file}->{cont});
562    
563          if (! update_db($file)) {          if (! update_db($file)) {
564                  return -ENOSYS();                  return -ENOSYS();
# Line 421  sub e_truncate { Line 573  sub e_truncate {
573    
574          print "truncate to $size\n";          print "truncate to $size\n";
575    
576          $files{$file}{cont} = substr($files{$file}{cont},0,$size);          $files->{$file}->{cont} = substr($files->{$file}->{cont},0,$size);
577          $files{$file}{size} = $size;          $files->{$file}->{size} = $size;
578          return 0          return 0
579  };  };
580    
# Line 431  sub e_utime { Line 583  sub e_utime {
583          my ($atime,$mtime,$file) = @_;          my ($atime,$mtime,$file) = @_;
584          $file = filename_fixup($file);          $file = filename_fixup($file);
585    
586          return -ENOENT() unless exists($files{$file});          return -ENOENT() unless exists($files->{$file});
587    
588          print "utime '$file' $atime $mtime\n";          print "utime '$file' $atime $mtime\n";
589    
590          $files{$file}{time} = $mtime;          $files->{$file}->{time} = $mtime;
591          return 0;          return 0;
592  }  }
593    
594  sub e_statfs { return 255, 1, 1, 1, 1, 2 }  sub e_statfs {
595    
596            my $size = 0;
597            my $inodes = 0;
598    
599            foreach my $f (keys %{$files}) {
600                    if ($f !~ /(^|\/)\.\.?$/) {
601                            $size += $files->{$f}->{size} || 0;
602                            $inodes++;
603                    }
604                    print "$inodes: $f [$size]\n";
605            }
606    
607            $size = int(($size+BLOCK-1)/BLOCK);
608    
609            my @ret = (255, $inodes, 1, $size, $size-1, BLOCK);
610    
611            #print "statfs: ",join(",",@ret),"\n";
612    
613            return @ret;
614    }
615    
616  sub e_unlink {  sub e_unlink {
617          my $file = filename_fixup(shift);          my $file = filename_fixup(shift);
618    
619          if (exists( $dirs{$file} )) {  #       if (exists( $dirs{$file} )) {
620                  print "unlink '$file' will re-read template names\n";  #               print "unlink '$file' will re-read template names\n";
621                  print Dumper($fuse_self);  #               print Dumper($fuse_self);
622                  $$fuse_self->{'read_filenames'}->();  #               $$fuse_self->{'read_filenames'}->();
623                  return 0;  #               return 0;
624          } elsif (exists( $files{$file} )) {          if (exists( $files->{$file} )) {
625                  print "unlink '$file' will invalidate cache\n";                  print "unlink '$file' will invalidate cache\n";
626                  read_content($file,$files{$file}{id});                  read_content($file,$files->{$file}->{id});
627                  return 0;                  return 0;
628          }          }
629    
# Line 464  __END__ Line 636  __END__
636    
637  Nothing.  Nothing.
638    
639    =head1 BUGS
640    
641    Size information (C<ls -s>) is wrong. It's a problem in upstream Fuse module
642    (for which I'm to blame lately), so when it gets fixes, C<Fuse::DBI> will
643    automagically pick it up.
644    
645  =head1 SEE ALSO  =head1 SEE ALSO
646    
647  C<FUSE (Filesystem in USErspace)> website  C<FUSE (Filesystem in USErspace)> website
648  L<http://sourceforge.net/projects/avf>  L<http://fuse.sourceforge.net/>
649    
650    Example for WebGUI which comes with this distribution in
651    directory C<examples/webgui.pl>. It also contains a lot of documentation
652    about design of this module, usage and limitations.
653    
654  =head1 AUTHOR  =head1 AUTHOR
655    
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