From: Dobrica Pavlinusic <dpavlin@rot13.org>
Date: Mon, 2 Jan 2006 23:19:28 +0000 (+0000)
Subject: added example filesystem which uses Filesys::Statvfs to implement statfs
X-Git-Tag: 0.07_3~10
X-Git-Url: http://git.rot13.org/?p=perl-fuse.git;a=commitdiff_plain;h=b39d899fa70504c08800465a0fd8f3d6108b648c

added example filesystem which uses Filesys::Statvfs to implement statfs

git-svn-id: svn+ssh://llin/home/dpavlin/private/svn/fuse/perl-llin@30 6e4b0b00-1209-0410-87b2-b275959b5705
---

diff --git a/examples/loopback-statvfs.pl b/examples/loopback-statvfs.pl
new file mode 100755
index 0000000..66f1abf
--- /dev/null
+++ b/examples/loopback-statvfs.pl
@@ -0,0 +1,158 @@
+#!/usr/bin/perl
+
+use strict;
+use blib;
+use Fuse;
+use IO::File;
+use POSIX qw(ENOENT ENOSYS EEXIST EPERM O_RDONLY O_RDWR O_APPEND O_CREAT);
+use Fcntl qw(S_ISBLK S_ISCHR S_ISFIFO SEEK_SET);
+require 'syscall.ph'; # for SYS_mknod and SYS_lchown
+use Filesys::Statvfs;
+
+my $tmp_path = "/tmp/fusetest-" . $ENV{LOGNAME};
+if (! -e $tmp_path) {
+	mkdir($tmp_path) || die "can't create $tmp_path: $!";
+}
+
+sub fixup { return $tmp_path . shift }
+
+sub x_getattr {
+	my ($file) = fixup(shift);
+	my (@list) = lstat($file);
+	return -$! unless @list;
+	return @list;
+}
+
+sub x_getdir {
+	my ($dirname) = fixup(shift);
+	unless(opendir(DIRHANDLE,$dirname)) {
+		return -ENOENT();
+	}
+	my (@files) = readdir(DIRHANDLE);
+	closedir(DIRHANDLE);
+	return (@files, 0);
+}
+
+sub x_open {
+	my ($file) = fixup(shift);
+	my ($mode) = shift;
+	return -$! unless sysopen(FILE,$file,$mode);
+	close(FILE);
+	return 0;
+}
+
+sub x_read {
+	my ($file,$bufsize,$off) = @_;
+	my ($rv) = -ENOSYS();
+	my ($handle) = new IO::File;
+	return -ENOENT() unless -e ($file = fixup($file));
+	my ($fsize) = -s $file;
+	return -ENOSYS() unless open($handle,$file);
+	if(seek($handle,$off,SEEK_SET)) {
+		read($handle,$rv,$bufsize);
+	}
+	return $rv;
+}
+
+sub x_write {
+	my ($file,$buf,$off) = @_;
+	my ($rv);
+	return -ENOENT() unless -e ($file = fixup($file));
+	my ($fsize) = -s $file;
+	return -ENOSYS() unless open(FILE,'+<',$file);
+	if($rv = seek(FILE,$off,SEEK_SET)) {
+		$rv = print(FILE $buf);
+	}
+	$rv = -ENOSYS() unless $rv;
+	close(FILE);
+	return length($buf);
+}
+
+sub err { return (-shift || -$!) }
+
+sub x_readlink { return readlink(fixup(shift)                 ); }
+sub x_unlink { return unlink(fixup(shift)) ? 0 : -$!;          }
+sub x_rmdir { return err(rmdir(fixup(shift))               ); }
+
+sub x_symlink { print "symlink\n"; return symlink(shift,fixup(shift)) ? 0 : -$!; }
+
+sub x_rename {
+	my ($old) = fixup(shift);
+	my ($new) = fixup(shift);
+	my ($err) = rename($old,$new) ? 0 : -ENOENT();
+	return $err;
+}
+sub x_link {
+	my ($from) = shift;
+	my ($to) = shift;
+	print "link $from -> $to\n";
+	my ($err) = link(fixup($from),fixup($to)) ? 0 : -$!;
+	return $err;
+}
+sub x_chown {
+	my ($fn) = fixup(shift);
+	print "nonexistent $fn\n" unless -e $fn;
+	my ($uid,$gid) = @_;
+	# perl's chown() does not chown symlinks, it chowns the symlink's
+	# target.  it fails when the link's target doesn't exist, because
+	# the stat64() syscall fails.
+	# this causes error messages when unpacking symlinks in tarballs.
+	my ($err) = syscall(&SYS_lchown,$fn,$uid,$gid,$fn) ? -$! : 0;
+	return $err;
+}
+sub x_chmod {
+	my ($fn) = fixup(shift);
+	my ($mode) = shift;
+	my ($err) = chmod($mode,$fn) ? 0 : -$!;
+	return $err;
+}
+sub x_truncate { return truncate(fixup(shift),shift) ? 0 : -$! ; }
+sub x_utime { return utime($_[1],$_[2],fixup($_[0])) ? 0:-$!; }
+
+sub x_mkdir { my ($name, $perm) = @_; return 0 if mkdir(fixup($name),$perm); return -$!; }
+sub x_rmdir { return 0 if rmdir fixup(shift); return -$!; }
+
+sub x_mknod {
+	# since this is called for ALL files, not just devices, I'll do some checks
+	# and possibly run the real mknod command.
+	my ($file, $modes, $dev) = @_;
+	$file = fixup($file);
+	$! = 0;
+	syscall(&SYS_mknod,$file,$modes,$dev);
+	return -$!;
+}
+
+# kludge
+sub x_statfs {
+	my $name = fixup(shift);
+	my($bsize, $frsize, $blocks, $bfree, $bavail,
+		$files, $ffree, $favail, $fsid, $basetype, $flag,
+		$namemax, $fstr) = statvfs("/tmp") || return -$!;
+	return ($namemax, $files, $ffree, $blocks, $bavail, $bsize);
+}
+	
+my ($mountpoint) = "";
+$mountpoint = shift(@ARGV) if @ARGV;
+Fuse::main(
+	mountpoint=>$mountpoint,
+	getattr =>"main::x_getattr",
+	readlink=>"main::x_readlink",
+	getdir  =>"main::x_getdir",
+	mknod   =>"main::x_mknod",
+	mkdir   =>"main::x_mkdir",
+	unlink  =>"main::x_unlink",
+	rmdir   =>"main::x_rmdir",
+	symlink =>"main::x_symlink",
+	rename  =>"main::x_rename",
+	link    =>"main::x_link",
+	chmod   =>"main::x_chmod",
+	chown   =>"main::x_chown",
+	truncate=>"main::x_truncate",
+	utime   =>"main::x_utime",
+	open    =>"main::x_open",
+	read    =>"main::x_read",
+	write   =>"main::x_write",
+	statfs  =>"main::x_statfs",
+	threaded=>0,
+	debug => 1,
+);