/[fuse.before_github]/perl-llin/examples/loopback-statvfs.pl
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Contents of /perl-llin/examples/loopback-statvfs.pl

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Revision 30 - (show annotations)
Mon Jan 2 23:19:28 2006 UTC (15 years, 9 months ago) by dpavlin
File MIME type: text/plain
File size: 4076 byte(s)
added example filesystem which uses Filesys::Statvfs to implement statfs
1 #!/usr/bin/perl
2
3 use strict;
4 use blib;
5 use Fuse;
6 use IO::File;
7 use POSIX qw(ENOENT ENOSYS EEXIST EPERM O_RDONLY O_RDWR O_APPEND O_CREAT);
8 use Fcntl qw(S_ISBLK S_ISCHR S_ISFIFO SEEK_SET);
9 require 'syscall.ph'; # for SYS_mknod and SYS_lchown
10 use Filesys::Statvfs;
11
12 my $tmp_path = "/tmp/fusetest-" . $ENV{LOGNAME};
13 if (! -e $tmp_path) {
14 mkdir($tmp_path) || die "can't create $tmp_path: $!";
15 }
16
17 sub fixup { return $tmp_path . shift }
18
19 sub x_getattr {
20 my ($file) = fixup(shift);
21 my (@list) = lstat($file);
22 return -$! unless @list;
23 return @list;
24 }
25
26 sub x_getdir {
27 my ($dirname) = fixup(shift);
28 unless(opendir(DIRHANDLE,$dirname)) {
29 return -ENOENT();
30 }
31 my (@files) = readdir(DIRHANDLE);
32 closedir(DIRHANDLE);
33 return (@files, 0);
34 }
35
36 sub x_open {
37 my ($file) = fixup(shift);
38 my ($mode) = shift;
39 return -$! unless sysopen(FILE,$file,$mode);
40 close(FILE);
41 return 0;
42 }
43
44 sub x_read {
45 my ($file,$bufsize,$off) = @_;
46 my ($rv) = -ENOSYS();
47 my ($handle) = new IO::File;
48 return -ENOENT() unless -e ($file = fixup($file));
49 my ($fsize) = -s $file;
50 return -ENOSYS() unless open($handle,$file);
51 if(seek($handle,$off,SEEK_SET)) {
52 read($handle,$rv,$bufsize);
53 }
54 return $rv;
55 }
56
57 sub x_write {
58 my ($file,$buf,$off) = @_;
59 my ($rv);
60 return -ENOENT() unless -e ($file = fixup($file));
61 my ($fsize) = -s $file;
62 return -ENOSYS() unless open(FILE,'+<',$file);
63 if($rv = seek(FILE,$off,SEEK_SET)) {
64 $rv = print(FILE $buf);
65 }
66 $rv = -ENOSYS() unless $rv;
67 close(FILE);
68 return length($buf);
69 }
70
71 sub err { return (-shift || -$!) }
72
73 sub x_readlink { return readlink(fixup(shift) ); }
74 sub x_unlink { return unlink(fixup(shift)) ? 0 : -$!; }
75 sub x_rmdir { return err(rmdir(fixup(shift)) ); }
76
77 sub x_symlink { print "symlink\n"; return symlink(shift,fixup(shift)) ? 0 : -$!; }
78
79 sub x_rename {
80 my ($old) = fixup(shift);
81 my ($new) = fixup(shift);
82 my ($err) = rename($old,$new) ? 0 : -ENOENT();
83 return $err;
84 }
85 sub x_link {
86 my ($from) = shift;
87 my ($to) = shift;
88 print "link $from -> $to\n";
89 my ($err) = link(fixup($from),fixup($to)) ? 0 : -$!;
90 return $err;
91 }
92 sub x_chown {
93 my ($fn) = fixup(shift);
94 print "nonexistent $fn\n" unless -e $fn;
95 my ($uid,$gid) = @_;
96 # perl's chown() does not chown symlinks, it chowns the symlink's
97 # target. it fails when the link's target doesn't exist, because
98 # the stat64() syscall fails.
99 # this causes error messages when unpacking symlinks in tarballs.
100 my ($err) = syscall(&SYS_lchown,$fn,$uid,$gid,$fn) ? -$! : 0;
101 return $err;
102 }
103 sub x_chmod {
104 my ($fn) = fixup(shift);
105 my ($mode) = shift;
106 my ($err) = chmod($mode,$fn) ? 0 : -$!;
107 return $err;
108 }
109 sub x_truncate { return truncate(fixup(shift),shift) ? 0 : -$! ; }
110 sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
111
112 sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
113 sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
114
115 sub x_mknod {
116 # since this is called for ALL files, not just devices, I'll do some checks
117 # and possibly run the real mknod command.
118 my ($file, $modes, $dev) = @_;
119 $file = fixup($file);
120 $! = 0;
121 syscall(&SYS_mknod,$file,$modes,$dev);
122 return -$!;
123 }
124
125 # kludge
126 sub x_statfs {
127 my $name = fixup(shift);
128 my($bsize, $frsize, $blocks, $bfree, $bavail,
129 $files, $ffree, $favail, $fsid, $basetype, $flag,
130 $namemax, $fstr) = statvfs("/tmp") || return -$!;
131 return ($namemax, $files, $ffree, $blocks, $bavail, $bsize);
132 }
133
134 my ($mountpoint) = "";
135 $mountpoint = shift(@ARGV) if @ARGV;
136 Fuse::main(
137 mountpoint=>$mountpoint,
138 getattr =>"main::x_getattr",
139 readlink=>"main::x_readlink",
140 getdir =>"main::x_getdir",
141 mknod =>"main::x_mknod",
142 mkdir =>"main::x_mkdir",
143 unlink =>"main::x_unlink",
144 rmdir =>"main::x_rmdir",
145 symlink =>"main::x_symlink",
146 rename =>"main::x_rename",
147 link =>"main::x_link",
148 chmod =>"main::x_chmod",
149 chown =>"main::x_chown",
150 truncate=>"main::x_truncate",
151 utime =>"main::x_utime",
152 open =>"main::x_open",
153 read =>"main::x_read",
154 write =>"main::x_write",
155 statfs =>"main::x_statfs",
156 threaded=>0,
157 debug => 1,
158 );

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