require Exporter;
require DynaLoader;
use AutoLoader;
-use Data::Dumper;
our @ISA = qw(Exporter DynaLoader);
# Items to export into callers namespace by default. Note: do not export
# If you do not need this, moving things directly into @EXPORT or @EXPORT_OK
# will save memory.
our %EXPORT_TAGS = (
- 'all' => [ qw(XATTR_CREATE XATTR_REPLACE) ],
+ 'all' => [ qw(XATTR_CREATE XATTR_REPLACE fuse_get_context fuse_version) ],
'xattr' => [ qw(XATTR_CREATE XATTR_REPLACE) ]
);
our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );
our @EXPORT = ();
-our $VERSION = '0.07';
+our $VERSION = '0.13';
sub AUTOLOAD {
# This AUTOLOAD is used to 'autoload' constants from the constant()
goto &$AUTOLOAD;
}
-sub XATTR_CREATE {
- # See <sys/xattr.h>.
- return 1;
-}
-
-sub XATTR_REPLACE {
- # See <sys/xattr.h>.
- return 2;
-}
-
bootstrap Fuse $VERSION;
sub main {
- my (@subs) = (undef,undef,undef,undef,undef,undef,undef,undef,undef,undef,
- undef,undef,undef,undef,undef,undef,undef,undef,undef,undef,
- undef,undef,undef,undef,undef);
- my (@names) = qw(getattr readlink getdir mknod mkdir unlink rmdir symlink
- rename link chmod chown truncate utime open read write statfs
- flush release fsync setxattr getxattr listxattr removexattr);
- my (@validOpts) = qw(allow_other);
- my ($tmp) = 0;
- my (%mapping) = map { $_ => $tmp++ } (@names);
- my (%optmap) = map { $_ => 1 } (@validOpts);
- my (%otherargs) = (debug=>0, threaded=>0, mountpoint=>"", mountopts=>"");
+ 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 $fuse_version = fuse_version();
+ if ($fuse_version >= 2.3) {
+ push(@names, qw/opendir readdir releasedir fsyncdir init destroy/);
+ }
+ if ($fuse_version >= 2.5) {
+ push(@names, qw/access create ftruncate fgetattr/);
+ }
+ if ($fuse_version >= 2.6) {
+ push(@names, qw/lock utimens bmap/);
+ }
+# if ($fuse_version >= 2.8) {
+# # junk doesn't contain a function pointer, and hopefully
+# # never will; it's a "dead" zone in the struct
+# # fuse_operations where a flag bit is declared. we don't
+# # need to concern ourselves with it, and it appears any
+# # arch with a 64 bit pointer will align everything to
+# # 8 bytes, making the question of pointer alignment for
+# # the last 2 wrapper functions no big thing.
+# push(@names, qw/junk ioctl poll/);
+# }
+ my @subs = map {undef} @names;
+ my $tmp = 0;
+ my %mapping = map { $_ => $tmp++ } @names;
+ my @otherargs = qw(debug threaded mountpoint mountopts nullpath_ok);
+ my %otherargs = (
+ debug => 0,
+ threaded => 0,
+ mountpoint => "",
+ mountopts => "",
+ nullpath_ok => 0,
+ );
while(my $name = shift) {
my ($subref) = shift;
if(exists($otherargs{$name})) {
$subs[$mapping{$name}] = $subref;
}
}
- foreach my $opt ( split(/,/,$otherargs{mountopts}) ) {
- if ( ! exists($optmap{$opt}) ) {
- croak "Use of an invalid mountopt argument";
- }
- }
if($otherargs{threaded}) {
# make sure threads are both available, and loaded.
if($Config{useithreads}) {
$otherargs{threaded} = 0;
}
}
- perl_fuse_main($otherargs{debug},$otherargs{threaded},$otherargs{mountpoint},$otherargs{mountopts},@subs);
+ perl_fuse_main(@otherargs{@otherargs},@subs);
}
# Autoload methods go after =cut, and are processed by the autosplit program.
=back
+nullpath_ok => boolean
+
+=over 1
+
+This flag tells Fuse to not pass paths for functions that operate on file
+or directory handles. This will yield empty path parameters for functions
+including read, write, flush, release, fsync, readdir, releasedir,
+fsyncdir, truncate, fgetattr and lock. If you use this, you must return
+file/directory handles from open, opendir and create. Default is 0 (off).
+Only effective on Fuse 2.8 and up; with earlier versions, this does nothing.
+
+=back
+
+=head3 Fuse::fuse_get_context
+
+ use Fuse "fuse_get_context";
+ my $caller_uid = fuse_get_context()->{"uid"};
+ my $caller_gid = fuse_get_context()->{"gid"};
+ my $caller_pid = fuse_get_context()->{"pid"};
+
+Access context information about the current Fuse operation.
+
+=head3 Fuse::fuse_version
+
+Indicates the Fuse version in use; more accurately, indicates the version
+of the Fuse API in use at build time. Returned as a decimal value; i.e.,
+for Fuse API v2.6, will return "2.6".
+
=head2 FUNCTIONS YOUR FILESYSTEM MAY IMPLEMENT
=head3 getattr
Arguments: Containing directory name.
Returns a list: 0 or more text strings (the filenames), followed by a numeric errno (usually 0).
-This is used to obtain directory listings. Its opendir(), readdir(), filldir() and closedir() all in one call.
+This is used to obtain directory listings. It's opendir(), readdir(), filldir() and closedir() all in one call.
example rv: return ('.', 'a', 'b', 0);
=head3 open
Arguments: Pathname, numeric flags (which is an OR-ing of stuff like O_RDONLY
-and O_SYNC, constants you can import from POSIX).
-Returns an errno.
+and O_SYNC, constants you can import from POSIX), fileinfo hash reference.
+Returns an errno, a file handle (optional).
No creation, or trunctation flags (O_CREAT, O_EXCL, O_TRUNC) will be passed to open().
+The fileinfo hash reference contains flags from the Fuse open call which may be modified by the module. The only fields presently supported are:
+ direct_io (version 2.4 onwards)
+ keep_cache (version 2.4 onwards)
+ nonseekable (version 2.9 onwards)
Your open() method needs only check if the operation is permitted for the given flags, and return 0 for success.
+Optionally a file handle may be returned, which will be passed to subsequent read, write, flush, fsync and release calls.
=head3 read
-Arguments: Pathname, numeric requestedsize, numeric offset.
+Arguments: Pathname, numeric requested size, numeric offset, file handle
Returns a numeric errno, or a string scalar with up to $requestedsize bytes of data.
Called in an attempt to fetch a portion of the file.
=head3 write
-Arguments: Pathname, scalar buffer, numeric offset. You can use length($buffer) to
+Arguments: Pathname, scalar buffer, numeric offset, file handle. You can use length($buffer) to
find the buffersize.
-Returns an errno.
+Returns length($buffer) if successful (number of bytes written).
-Called in an attempt to write (or overwrite) a portion of the file. Be prepared because $buffer could contain random binary data with NULLs and all sorts of other wonderful stuff.
+Called in an attempt to write (or overwrite) a portion of the file. Be prepared because $buffer could contain random binary data with NULs and all sorts of other wonderful stuff.
=head3 statfs
=head3 flush
-Arguments: Pathname
+Arguments: Pathname, file handle
Returns an errno or 0 on success.
Called to synchronise any cached data. This is called before the file
=head3 release
-Arguments: Pathname, numeric flags passed to open
+Arguments: Pathname, numeric flags passed to open, file handle
Returns an errno or 0 on success.
Called to indicate that there are no more references to the file. Called once
Arguments: Pathname, extended attribute's name
Returns an errno or 0 on success.
+=head3 opendir
+
+Arguments: Pathname of a directory
+Returns an errno, and a directory handle (optional)
+
+Called when opening a directory for reading. If special handling is
+required to open a directory, this operation can be implemented to handle
+that.
+
+=head3 readdir
+
+Arguments: Pathname of a directory, numeric offset, (optional) directory handle
+Returns a list of 0 or more entries, followed by a numeric errno (usually 0).
+The entries can be simple strings (filenames), or arrays containing an
+offset number, the filename, and optionally an array ref containing the
+stat values (as would be returned from getattr()).
+
+This is used to read entries from a directory. It can be used to return just
+entry names like getdir(), or can get a segment of the available entries,
+which requires using array refs and the 2- or 3-item form, with offset values
+starting from 1. If you wish to return the parameters to fill each entry's
+struct stat, but do not wish to do partial entry lists/entry counting, set
+the first element of each array to 0 always.
+
+Note that if this call is implemented, it overrides getdir() ALWAYS.
+
+=head3 releasedir
+
+Arguments: Pathname of a directory, (optional) directory handle
+Returns an errno or 0 on success
+
+Called when there are no more references to an opened directory. Called once
+for each pathname or handle passed to opendir(). Similar to release(), but
+for directories. Accepts a return value, but like release(), the response
+code will not propagate to any corresponding closedir() calls.
+
+=head3 fsyncdir
+
+Arguments: Pathname of a directory, numeric flags, (optional) directory handle
+Returns an errno or 0 on success.
+
+Called to synchronize any changes to a directory's contents. If flag is
+non-zero, only synchronize user data, otherwise synchronize user data and
+metadata.
+
+=head3 init
+
+Arguments: None.
+Returns (optionally) an SV to be passed as private_data via fuse_get_context().
+
+=head3 destroy
+
+Arguments: (optional) private data SV returned from init(), if any.
+Returns nothing.
+
+=head3 access
+
+Arguments: Pathname, access mode flags
+Returns an errno or 0 on success.
+
+Determine if the user attempting to access the indicated file has access to
+perform the requested actions. The user ID can be determined by calling
+fuse_get_context(). See access(2) for more information.
+
+=head3 create
+
+Arguments: Pathname, create mask, open mode flags
+Returns errno or 0 on success, and (optional) file handle.
+
+Create a file with the path indicated, then open a handle for reading and/or
+writing with the supplied mode flags. Can also return a file handle like
+open() as part of the call.
+
+=head3 ftruncate
+
+Arguments: Pathname, numeric offset, (optional) file handle
+Returns errno or 0 on success
+
+Like truncate(), but on an opened file.
+
+=head3 fgetattr
+
+Arguments: Pathname, (optional) file handle
+Returns a list, very similar to the 'stat' function (see
+perlfunc). On error, simply return a single numeric scalar
+value (e.g. "return -ENOENT();").
+
+Like getattr(), but on an opened file.
+
+=head3 lock
+
+Arguments: Pathname, numeric command code, hashref containing lock parameters, (optional) file handle
+Returns errno or 0 on success
+
+Used to lock or unlock regions of a file. Locking is handled locally, but this
+allows (especially for networked file systems) for protocol-level locking
+semantics to also be employed, if any are available.
+
+See the Fuse documentation for more explanation of lock(). The needed symbols
+for the lock constants can be obtained by importing Fcntl.
+
+=head3 utimens
+
+Arguments: Pathname, last accessed time, last modified time
+Returns errno or 0 on success
+
+Like utime(), but allows time resolution down to the nanosecond. Currently
+times are passed as "numeric" (internally I believe these are represented
+typically as "long double"), so the sub-second portion is represented as
+fractions of a second.
+
+Note that if this call is implemented, it overrides utime() ALWAYS.
+
+=head3 bmap
+
+Arguments: Pathname, numeric blocksize, numeric block number
+Returns errno or 0 on success, and physical block number if successful
+
+Used to map a block number offset in a file to the physical block offset
+on the block device backing the file system. This is intended for
+filesystems that are stored on an actual block device, with the 'blkdev'
+option passed.
+
=head1 AUTHOR
Mark Glines, E<lt>mark@glines.orgE<gt>
projects / perl-fuse.git / blobdiff