Golang nodefs.File类代码示例

func (n *pathInode) GetAttr(out *fuse.Attr, file nodefs.File, context *fuse.Context) (code fuse.Status) {
	var fi *fuse.Attr
	if file == nil {
		// Linux currently (tested on v4.4) does not pass a file descriptor for
		// fstat. To be able to stat a deleted file we have to find ourselves
		// an open fd.
		file = n.Inode().AnyFile()
	}

	if file != nil {
		code = file.GetAttr(out)
	}

	if file == nil || code == fuse.ENOSYS || code == fuse.EBADF {
		fi, code = n.fs.GetAttr(n.GetPath(), context)
	}

	if fi != nil {
		n.setClientInode(fi.Ino)
	}

	if fi != nil && !fi.IsDir() && fi.Nlink == 0 {
		fi.Nlink = 1
	}

	if fi != nil {
		*out = *fi
	}
	return code
}

func (n *classicNode) Truncate(file nodefs.File, size uint64, context *fuse.Context) (code fuse.Status) {
	if file != nil {
		return file.Truncate(size)
	} else if n.backing != "" {
		return fuse.ToStatus(os.Truncate(n.backing, int64(size)))
	}
	return fuse.OK
}

func getAdbFile(file nodefs.File) *AdbFile {
	for {
		if file, ok := file.(*AdbFile); ok {
			return file
		}
		if file == nil {
			panic("no AdbFile")
		}
		file = file.InnerFile()
	}
}

func (me *memNode) Truncate(file nodefs.File, size uint64, context *fuse.Context) (code fuse.Status) {
	me.mutex.Lock()
	defer me.mutex.Unlock()
	me.promote()
	if file != nil {
		code = file.Truncate(size)
	} else {
		code = fuse.ToStatus(os.Truncate(me.backing, int64(size)))
	}

	if code.Ok() {
		me.info.Size = size
		me.touch()
	}
	return code
}

func (n *pathInode) Fallocate(file nodefs.File, off uint64, size uint64, mode uint32, context *fuse.Context) (code fuse.Status) {
	if file != nil {
		code = file.Allocate(off, size, mode)
		if code.Ok() {
			return code
		}
	}

	files := n.Inode().Files(fuse.O_ANYWRITE)
	for _, f := range files {
		// TODO - pass context
		code = f.Allocate(off, size, mode)
		if code.Ok() {
			return code
		}
	}

	return code
}

func (me *memNode) GetAttr(out *fuse.Attr, file nodefs.File, context *fuse.Context) (code fuse.Status) {
	var sz uint64
	if file != nil {
		code := file.GetAttr(out)
		if code.Ok() {
			sz = out.Size
		} else {
			msg := fmt.Sprintf("File.GetAttr(%s) = %v, %v", file.String(), out, code)
			panic(msg)
		}
	}
	me.mutex.RLock()
	defer me.mutex.RUnlock()
	*out = me.info
	if file != nil {
		out.Size = sz
	}
	return fuse.OK
}

// GetAttr - FUSE call
func (rfs *ReverseFS) GetAttr(relPath string, context *fuse.Context) (*fuse.Attr, fuse.Status) {
	if rfs.isTranslatedConfig(relPath) {
		return rfs.inoAwareStat(configfile.ConfReverseName)
	}
	// Handle virtual files
	var f nodefs.File
	var status fuse.Status
	virtual := false
	if rfs.isDirIV(relPath) {
		virtual = true
		f, status = rfs.newDirIVFile(relPath)
	}
	if rfs.isNameFile(relPath) {
		virtual = true
		f, status = rfs.newNameFile(relPath)
	}
	if virtual {
		if !status.Ok() {
			fmt.Printf("GetAttr %q: newXFile failed: %v\n", relPath, status)
			return nil, status
		}
		var a fuse.Attr
		status = f.GetAttr(&a)
		return &a, status
	}

	cPath, err := rfs.decryptPath(relPath)
	if err != nil {
		return nil, fuse.ToStatus(err)
	}
	a, status := rfs.inoAwareStat(cPath)
	if !status.Ok() {
		return nil, status
	}
	// Calculate encrypted file size
	if a.IsRegular() {
		a.Size = rfs.contentEnc.PlainSizeToCipherSize(a.Size)
	}
	return a, fuse.OK
}

func (n *pathInode) Utimens(file nodefs.File, atime *time.Time, mtime *time.Time, context *fuse.Context) (code fuse.Status) {
	// Note that Linux currently (Linux 4.4) DOES NOT pass a file descriptor
	// to FUSE for futimens. We still check because it may change in the future.
	if file != nil {
		code = file.Utimens(atime, mtime)
		if code != fuse.ENOSYS {
			return code
		}
	}

	files := n.Inode().Files(fuse.O_ANYWRITE)
	for _, f := range files {
		// TODO - pass context
		code = f.Utimens(atime, mtime)
		if code.Ok() {
			return code
		}
	}
	if len(files) == 0 || code == fuse.ENOSYS || code == fuse.EBADF {
		code = n.fs.Utimens(n.GetPath(), atime, mtime, context)
	}
	return code
}

func (n *pathInode) Truncate(file nodefs.File, size uint64, context *fuse.Context) (code fuse.Status) {
	// A file descriptor was passed in AND the filesystem implements the
	// operation on the file handle. This the common case for ftruncate.
	if file != nil {
		code = file.Truncate(size)
		if code != fuse.ENOSYS {
			return code
		}
	}

	files := n.Inode().Files(fuse.O_ANYWRITE)
	for _, f := range files {
		// TODO - pass context
		code = f.Truncate(size)
		if code.Ok() {
			return code
		}
	}
	if len(files) == 0 || code == fuse.ENOSYS || code == fuse.EBADF {
		code = n.fs.Truncate(n.GetPath(), size, context)
	}
	return code
}

func (n *pathInode) Chown(file nodefs.File, uid uint32, gid uint32, context *fuse.Context) (code fuse.Status) {
	// Note that Linux currently (Linux 4.4) DOES NOT pass a file descriptor
	// to FUSE for fchown. We still check because it may change in the future.
	if file != nil {
		code = file.Chown(uid, gid)
		if code != fuse.ENOSYS {
			return code
		}
	}

	files := n.Inode().Files(fuse.O_ANYWRITE)
	for _, f := range files {
		// TODO - pass context
		code = f.Chown(uid, gid)
		if code.Ok() {
			return code
		}
	}
	if len(files) == 0 || code == fuse.ENOSYS || code == fuse.EBADF {
		// TODO - can we get just FATTR_GID but not FATTR_UID ?
		code = n.fs.Chown(n.GetPath(), uid, gid, context)
	}
	return code
}

func (n *pathInode) Chmod(file nodefs.File, perms uint32, context *fuse.Context) (code fuse.Status) {
	// Note that Linux currently (Linux 4.4) DOES NOT pass a file descriptor
	// to FUSE for fchmod. We still check because that may change in the future.
	if file != nil {
		code = file.Chmod(perms)
		if code != fuse.ENOSYS {
			return code
		}
	}

	files := n.Inode().Files(fuse.O_ANYWRITE)
	for _, f := range files {
		// TODO - pass context
		code = f.Chmod(perms)
		if code.Ok() {
			return
		}
	}

	if len(files) == 0 || code == fuse.ENOSYS || code == fuse.EBADF {
		code = n.fs.Chmod(n.GetPath(), perms, context)
	}
	return code
}

func (fs *unionFS) putDeletion(name string) (code fuse.Status) {
	code = fs.createDeletionStore()
	if !code.Ok() {
		return code
	}

	marker := fs.deletionPath(name)
	fs.deletionCache.AddEntry(path.Base(marker))

	// Is there a WriteStringToFileOrDie ?
	writable := fs.fileSystems[0]
	fi, code := writable.GetAttr(marker, nil)
	if code.Ok() && fi.Size == uint64(len(name)) {
		return fuse.OK
	}

	var f nodefs.File
	if code == fuse.ENOENT {
		f, code = writable.Create(marker, uint32(os.O_TRUNC|os.O_WRONLY), 0644, nil)
	} else {
		writable.Chmod(marker, 0644, nil)
		f, code = writable.Open(marker, uint32(os.O_TRUNC|os.O_WRONLY), nil)
	}
	if !code.Ok() {
		log.Printf("could not create deletion file %v: %v", marker, code)
		return fuse.EPERM
	}
	defer f.Release()
	defer f.Flush()
	n, code := f.Write([]byte(name), 0)
	if int(n) != len(name) || !code.Ok() {
		panic(fmt.Sprintf("Error for writing %v: %v, %v (exp %v) %v", name, marker, n, len(name), code))
	}

	return fuse.OK
}

func (n *pathInode) Flush(file nodefs.File, openFlags uint32, context *fuse.Context) (code fuse.Status) {
	return file.Flush()
}

func (n *pathInode) Write(file nodefs.File, data []byte, off int64, context *fuse.Context) (written uint32, code fuse.Status) {
	if file != nil {
		return file.Write(data, off)
	}
	return 0, fuse.ENOSYS
}

func (n *pathInode) Read(file nodefs.File, dest []byte, off int64, context *fuse.Context) (fuse.ReadResult, fuse.Status) {
	if file != nil {
		return file.Read(dest, off)
	}
	return nil, fuse.ENOSYS
}