use warnings;
use Errno;
use Carp;
+use Config;
require Exporter;
require DynaLoader;
# This allows declaration use Fuse ':all';
# If you do not need this, moving things directly into @EXPORT or @EXPORT_OK
# will save memory.
-our %EXPORT_TAGS = ( 'all' => [ qw(
- FUSE_DEBUG
-) ] );
+our %EXPORT_TAGS = (
+ 'all' => [ qw(XATTR_CREATE XATTR_REPLACE) ],
+ 'xattr' => [ qw(XATTR_CREATE XATTR_REPLACE) ]
+ );
our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );
-our @EXPORT = qw(
- FUSE_DEBUG
-);
-our $VERSION = '0.01';
+our @EXPORT = ();
+our $VERSION = '0.07';
sub AUTOLOAD {
# This AUTOLOAD is used to 'autoload' constants from the constant()
goto &$AUTOLOAD;
}
+sub XATTR_CREATE {
+ # See <sys/xattr.h>.
+ return 1;
+}
+
+sub XATTR_REPLACE {
+ # See <sys/xattr.h>.
+ return 2;
+}
+
bootstrap Fuse $VERSION;
sub main {
- my (@subs) = (0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0);
- my (@names) = qw(getattr readlink getdir mknod mkdir unlink rmdir symlink
- rename link chmod chown truncate utime open read write statfs);
- my ($tmp) = 0;
- my (%mapping) = map { $_ => $tmp++ } (@names);
- my (%otherargs) = (debug=>0, mountpoint=>"");
+ my @names = qw(getattr readlink getdir mknod mkdir unlink rmdir symlink
+ rename link chmod chown truncate utime open read write statfs
+ flush release fsync setxattr getxattr listxattr removexattr);
+ my @subs = map {undef} @names;
+ my @validOpts = qw(ro allow_other default_permissions fsname use_ino nonempty);
+ my $tmp = 0;
+ my %mapping = map { $_ => $tmp++ } @names;
+ my %optmap = map { $_ => 1 } @validOpts;
+ my @otherargs = qw(debug threaded mountpoint mountopts);
+ my %otherargs = (debug=>0, threaded=>0, mountpoint=>"", mountopts=>"");
while(my $name = shift) {
my ($subref) = shift;
if(exists($otherargs{$name})) {
$otherargs{$name} = $subref;
} else {
croak "There is no function $name" unless exists($mapping{$name});
- croak "Usage: Fuse::main(getattr => &my_getattr, ...)" unless $subref;
- croak "Usage: Fuse::main(getattr => &my_getattr, ...)" unless ref($subref);
- croak "Usage: Fuse::main(getattr => &my_getattr, ...)" unless ref($subref) eq "CODE";
+ croak "Usage: Fuse::main(getattr => \"main::my_getattr\", ...)" unless $subref;
$subs[$mapping{$name}] = $subref;
}
}
- perl_fuse_main($otherargs{debug},$otherargs{mountpoint},@subs);
+ foreach my $opt ( map {m/^([^=]*)/; $1} split(/,/,$otherargs{mountopts}) ) {
+ next if exists($optmap{$opt});
+ croak "Fuse::main: invalid '$opt' argument in mountopts";
+ }
+ if($otherargs{threaded}) {
+ # make sure threads are both available, and loaded.
+ if($Config{useithreads}) {
+ if(exists($threads::{VERSION})) {
+ if(exists($threads::shared::{VERSION})) {
+ # threads will work.
+ } else {
+ carp("Thread support requires you to use threads::shared.\nThreads are disabled.\n");
+ $otherargs{threaded} = 0;
+ }
+ } else {
+ carp("Thread support requires you to use threads and threads::shared.\nThreads are disabled.\n");
+ $otherargs{threaded} = 0;
+ }
+ } else {
+ carp("Thread support was not compiled into this build of perl.\nThreads are disabled.\n");
+ $otherargs{threaded} = 0;
+ }
+ }
+ perl_fuse_main(@otherargs{@otherargs},@subs);
}
# Autoload methods go after =cut, and are processed by the autosplit program.
use Fuse;
my ($mountpoint) = "";
$mountpoint = shift(@ARGV) if @ARGV;
- Fuse::main(mountpoint=>$mountpoint, getattr=>\&my_getattr, getdir=>\&my_getdir, ...);
+ Fuse::main(mountpoint=>$mountpoint, getattr=>"main::my_getattr", getdir=>"main::my_getdir", ...);
=head1 DESCRIPTION
FUSE expects you to implement callbacks for the various functions.
-NOTE: I have only tested the things implemented in example.pl!
-It should work, but some things may not.
-
In the following definitions, "errno" can be 0 (for a success),
-EINVAL, -ENOENT, -EONFIRE, any integer less than 1 really.
etc) can be imported either from POSIX or from Fcntl, often both.
See their respective documentations, for more information.
-=head2 EXPORT
+=head2 EXPORTED SYMBOLS
None by default.
-=head2 EXPORTABLE CONSTANTS
+You can request all exportable symbols by using the tag ":all".
-None.
+You can request the extended attribute symbols by using the tag ":xattr".
+This will export XATTR_CREATE and XATTR_REPLACE.
=head2 FUNCTIONS
=back
-unthreaded => boolean
+mountopts => string
=over 1
-This turns FUSE multithreading off and on. NOTE: This perlmodule does not
-currently work properly in multithreaded mode! The author is unfortunately
-not familiar enough with perl-threads internals, and according to the
-documentation available at time of writing (2002-03-08), those internals are
-subject to changing anyway. Note that singlethreaded mode also means that
-you will not have to worry about reentrancy, though you will have to worry
-about recursive lookups (since the kernel holds a global lock on your
-filesystem and blocks waiting for one callback to complete before calling
-another).
+This is a comma seperated list of mount options to pass to the FUSE kernel
+module.
-I hope to add full multithreading functionality later, but for now, I
-recommend you leave this option at the default, 1 (which means
-unthreaded, no threads will be used and no reentrancy is needed).
+At present, it allows the specification of the allow_other
+argument when mounting the new FUSE filesystem. To use this, you will also
+need 'user_allow_other' in /etc/fuse.conf as per the FUSE documention
+
+ mountopts => "allow_other" or
+ mountopts => ""
+
+=back
+
+threaded => boolean
+
+=over 1
+
+This turns FUSE multithreading on and off. The default is 0, meaning your FUSE
+script will run in single-threaded mode. Note that single-threaded mode also
+means that you will not have to worry about reentrancy, though you will have to
+worry about recursive lookups. In single-threaded mode, FUSE holds a global
+lock on your filesystem, and will wait for one callback to return before
+calling another. This can lead to deadlocks, if your script makes any attempt
+to access files or directories in the filesystem it is providing. (This
+includes calling stat() on the mount-point, statfs() calls from the 'df'
+command, and so on and so forth.) It is worth paying a little attention and
+being careful about this.
+
+Enabling multithreading will cause FUSE to make multiple simultaneous calls
+into the various callback functions of your perl script. If you enable
+threaded mode, you can enjoy all the parallel execution and interactive
+response benefits of threads, and you get to enjoy all the benefits of race
+conditions and locking bugs, too. Please also ensure any other perl modules
+you're using are also thread-safe.
+
+(If enabled, this option will cause a warning if your perl interpreter was not
+built with USE_ITHREADS, or if you have failed to use threads or
+threads::shared.)
=back
-ENOANO(), $namelen, $files, $files_free, $blocks, $blocks_avail, $blocksize
+=head3 flush
+
+Arguments: Pathname
+Returns an errno or 0 on success.
+
+Called to synchronise any cached data. This is called before the file
+is closed. It may be called multiple times before a file is closed.
+
+=head3 release
+
+Arguments: Pathname, numeric flags passed to open
+Returns an errno or 0 on success.
+
+Called to indicate that there are no more references to the file. Called once
+for every file with the same pathname and flags as were passed to open.
+
+=head3 fsync
+
+Arguments: Pathname, numeric flags
+Returns an errno or 0 on success.
+
+Called to synchronise the file's contents. If flags is non-zero,
+only synchronise the user data. Otherwise synchronise the user and meta data.
+
+=head3 setxattr
+
+Arguments: Pathname, extended attribute's name, extended attribute's value, numeric flags (which is an OR-ing of XATTR_CREATE and XATTR_REPLACE
+Returns an errno or 0 on success.
+
+Called to set the value of the named extended attribute.
+
+If you wish to reject setting of a particular form of extended attribute name
+(e.g.: regexps matching user\..* or security\..*), then return - EOPNOTSUPP.
+
+If flags is set to XATTR_CREATE and the extended attribute already exists,
+this should fail with - EEXIST. If flags is set to XATTR_REPLACE
+and the extended attribute doesn't exist, this should fail with - ENOATTR.
+
+XATTR_CREATE and XATTR_REPLACE are provided by this module, but not exported
+by default. To import them:
+
+ use Fuse ':xattr';
+
+or:
+
+ use Fuse ':all';
+
+=head3 getxattr
+
+Arguments: Pathname, extended attribute's name
+Returns an errno, 0 if there was no value, or the extended attribute's value.
+
+Called to get the value of the named extended attribute.
+
+=head3 listxattr
+
+Arguments: Pathname
+Returns a list: 0 or more text strings (the extended attribute names), followed by a numeric errno (usually 0).
+
+=head3 removexattr
+
+Arguments: Pathname, extended attribute's name
+Returns an errno or 0 on success.
+
=head1 AUTHOR
Mark Glines, E<lt>mark@glines.orgE<gt>
projects / perl-fuse.git / blobdiff