示例#1
0
func main() {
	flag.Usage = usage
	flag.Parse()

	if flag.NArg() != 1 {
		usage()
		os.Exit(2)
	}
	mountpoint := flag.Arg(0)

	c, err := fuse.Mount(
		mountpoint,
		fuse.FSName("clock"),
		fuse.Subtype("clockfsfs"),
		fuse.LocalVolume(),
		fuse.VolumeName("Clock filesystem"),
	)
	if err != nil {
		log.Fatal(err)
	}
	defer c.Close()

	srv := fs.New(c, nil)
	filesys := &FS{
		// We pre-create the clock node so that it's always the same
		// object returned from all the Lookups. You could carefully
		// track its lifetime between Lookup&Forget, and have the
		// ticking & invalidation happen only when active, but let's
		// keep this example simple.
		clockFile: &File{
			fuse: srv,
		},
	}
	filesys.clockFile.tick()
	// This goroutine never exits. That's fine for this example.
	go filesys.clockFile.update()
	if err := srv.Serve(filesys); err != nil {
		log.Fatal(err)
	}

	// Check if the mount process has an error to report.
	<-c.Ready
	if err := c.MountError; err != nil {
		log.Fatal(err)
	}
}
示例#2
0
// Convert to mount options to be passed to package bazilfuse.
func (c *MountConfig) bazilfuseOptions() (opts []bazilfuse.MountOption) {
	isDarwin := runtime.GOOS == "darwin"

	// Enable permissions checking in the kernel. See the comments on
	// InodeAttributes.Mode.
	opts = append(opts, bazilfuse.SetOption("default_permissions", ""))

	// HACK(jacobsa): Work around what appears to be a bug in systemd v219, as
	// shipped in Ubuntu 15.04, where it automatically unmounts any file system
	// that doesn't set an explicit name.
	//
	// When Ubuntu contains systemd v220, this workaround should be removed and
	// the systemd bug reopened if the problem persists.
	//
	// Cf. https://github.com/bazil/fuse/issues/89
	// Cf. https://bugs.freedesktop.org/show_bug.cgi?id=90907
	fsname := c.FSName
	if runtime.GOOS == "linux" && fsname == "" {
		fsname = "some_fuse_file_system"
	}

	// Special file system name?
	if fsname != "" {
		opts = append(opts, bazilfuse.FSName(fsname))
	}

	// Read only?
	if c.ReadOnly {
		opts = append(opts, bazilfuse.ReadOnly())
	}

	// OS X: set novncache when appropriate.
	if isDarwin && !c.EnableVnodeCaching {
		opts = append(opts, bazilfuse.SetOption("novncache", ""))
	}

	// OS X: disable the use of "Apple Double" (._foo and .DS_Store) files, which
	// just add noise to debug output and can have significant cost on
	// network-based file systems.
	//
	// Cf. https://github.com/osxfuse/osxfuse/wiki/Mount-options
	if isDarwin {
		opts = append(opts, bazilfuse.SetOption("noappledouble", ""))
	}

	// Ask the Linux kernel for larger read requests.
	//
	// As of 2015-03-26, the behavior in the kernel is:
	//
	//  *  (http://goo.gl/bQ1f1i, http://goo.gl/HwBrR6) Set the local variable
	//     ra_pages to be init_response->max_readahead divided by the page size.
	//
	//  *  (http://goo.gl/gcIsSh, http://goo.gl/LKV2vA) Set
	//     backing_dev_info::ra_pages to the min of that value and what was sent
	//     in the request's max_readahead field.
	//
	//  *  (http://goo.gl/u2SqzH) Use backing_dev_info::ra_pages when deciding
	//     how much to read ahead.
	//
	//  *  (http://goo.gl/JnhbdL) Don't read ahead at all if that field is zero.
	//
	// Reading a page at a time is a drag. Ask for a larger size.
	const maxReadahead = 1 << 20
	opts = append(opts, bazilfuse.MaxReadahead(maxReadahead))

	// Last but not least: other user-supplied options.
	for k, v := range c.Options {
		opts = append(opts, bazilfuse.SetOption(k, v))
	}

	return
}