diff --git a/filesystem.go b/filesystem.go
index 2d18cfd..43173d6 100644
--- a/filesystem.go
+++ b/filesystem.go
@@ -240,7 +240,7 @@ func (fs *WsFs) Truncate(name string, offset uint64, context *fuse.Context) (cod
 	r := Request{
 		Method: MethodChown,
 		Path:   name,
-		Offset: offset,
+		Offset: int64(offset),
 	}
 	resp, ok := fs.getResponse(&r)
 	if !ok {
@@ -275,7 +275,10 @@ func (fs *WsFs) Open(name string, flags uint32, context *fuse.Context) (file nod
 	if !ok {
 		return nil, fuse.ENOSYS
 	}
-	return newWsFsFile(*resp.FileHandle, fs), resp.Code
+	if resp.Code != fuse.OK {
+		return nil, resp.Code
+	}
+	return newWsFsFile(resp.FileHandle, fs), resp.Code
 }
 
 func (fs *WsFs) Create(name string, flags uint32, mode uint32, context *fuse.Context) (file nodefs.File, code fuse.Status) {
@@ -288,5 +291,8 @@ func (fs *WsFs) Create(name string, flags uint32, mode uint32, context *fuse.Con
 	if !ok {
 		return nil, fuse.ENOSYS
 	}
-	return newWsFsFile(*resp.FileHandle, fs), resp.Code
+	if resp.Code != fuse.OK {
+		return nil, resp.Code
+	}
+	return newWsFsFile(resp.FileHandle, fs), resp.Code
 }
diff --git a/fs_file.go b/fs_file.go
index 14422f9..6c8f06f 100644
--- a/fs_file.go
+++ b/fs_file.go
@@ -1,6 +1,7 @@
 package kubelwagen
 
 import (
+	"fmt"
 	"time"
 
 	"github.com/hanwen/go-fuse/fuse"
@@ -21,32 +22,87 @@ func newWsFsFile(handle int, fs *WsFs) *WsFsFile {
 	}
 }
 func (f *WsFsFile) String() string {
-	return "WsFsFile"
+	return fmt.Sprintf("WsFsFile:%d", f.h)
 }
 
 func (f *WsFsFile) Read(buf []byte, off int64) (fuse.ReadResult, fuse.Status) {
-	return nil, fuse.ENOSYS
+	r := Request{
+		Method:     MethodFileRead,
+		FileHandle: f.h,
+		Offset:     off,
+	}
+	resp, ok := f.fs.getResponse(&r)
+	if !ok {
+		return nil, fuse.ENOSYS
+	}
+	return fuse.ReadResultData(resp.Data), resp.Code
 }
 
 func (f *WsFsFile) Write(data []byte, off int64) (uint32, fuse.Status) {
-	return 0, fuse.ENOSYS
+	r := Request{
+		Method:     MethodFileWrite,
+		FileHandle: f.h,
+		Offset:     off,
+		Data:       data,
+	}
+	resp, ok := f.fs.getResponse(&r)
+	if !ok {
+		return 0, fuse.ENOSYS
+	}
+	return uint32(resp.WriteSize), resp.Code
+}
+
+func (f *WsFsFile) Flock(flags int) fuse.Status {
+	r := Request{
+		Method:     MethodFileFlock,
+		FileHandle: f.h,
+		Flags:      uint32(flags),
+	}
+	resp, ok := f.fs.getResponse(&r)
+	if !ok {
+		return fuse.ENOSYS
+	}
+	return resp.Code
 }
 
-func (f *WsFsFile) Flock(flags int) fuse.Status { return fuse.ENOSYS }
 func (f *WsFsFile) Flush() fuse.Status {
-	return fuse.OK
+	return f.Fsync(0)
 }
 
 func (f *WsFsFile) Release() {
-
+	r := Request{
+		Method:     MethodFileRelease,
+		FileHandle: f.h,
+	}
+	f.fs.getResponse(&r)
 }
 
-func (f *WsFsFile) GetAttr(*fuse.Attr) fuse.Status {
-	return fuse.ENOSYS
+func (f *WsFsFile) GetAttr(attr *fuse.Attr) fuse.Status {
+	r := Request{
+		Method:     MethodFileGetAttr,
+		FileHandle: f.h,
+	}
+	resp, ok := f.fs.getResponse(&r)
+	if !ok {
+		return fuse.ENOSYS
+	}
+	if resp.Stat != nil {
+		*attr = *resp.Stat
+	}
+	return resp.Code
 }
 
 func (f *WsFsFile) Fsync(flags int) (code fuse.Status) {
-	return fuse.ENOSYS
+	r := Request{
+		Method:     MethodFileFsync,
+		FileHandle: f.h,
+		Flags:      uint32(flags),
+	}
+	resp, ok := f.fs.getResponse(&r)
+	if !ok {
+		return fuse.ENOSYS
+	}
+	return resp.Code
 }
 
 func (f *WsFsFile) Utimens(atime *time.Time, mtime *time.Time) fuse.Status {
@@ -54,17 +110,55 @@ func (f *WsFsFile) Utimens(atime *time.Time, mtime *time.Time) fuse.Status {
 }
 
 func (f *WsFsFile) Truncate(size uint64) fuse.Status {
-	return fuse.ENOSYS
+	r := Request{
+		Method:     MethodFileTruncate,
+		FileHandle: f.h,
+		Size:       uint32(size),
+	}
+	resp, ok := f.fs.getResponse(&r)
+	if !ok {
+		return fuse.ENOSYS
+	}
+	return resp.Code
 }
 
 func (f *WsFsFile) Chown(uid uint32, gid uint32) fuse.Status {
-	return fuse.ENOSYS
+	r := Request{
+		Method:     MethodFileChown,
+		FileHandle: f.h,
+		UID:        uid,
+		GID:        gid,
+	}
+	resp, ok := f.fs.getResponse(&r)
+	if !ok {
+		return fuse.ENOSYS
+	}
+	return resp.Code
 }
 
 func (f *WsFsFile) Chmod(perms uint32) fuse.Status {
-	return fuse.ENOSYS
+	r := Request{
+		Method:     MethodFileChmod,
+		FileHandle: f.h,
+		Flags:      perms,
+	}
+	resp, ok := f.fs.getResponse(&r)
+	if !ok {
+		return fuse.ENOSYS
+	}
+	return resp.Code
 }
 
 func (f *WsFsFile) Allocate(off uint64, size uint64, mode uint32) (code fuse.Status) {
-	return fuse.ENOSYS
+	r := Request{
+		Method:     MethodFileAllocate,
+		FileHandle: f.h,
+		Mode:       mode,
+		Size:       uint32(size),
+	}
+	resp, ok := f.fs.getResponse(&r)
+	if !ok {
+		return fuse.ENOSYS
+	}
+	return resp.Code
 }
diff --git a/request.go b/request.go
index 5596017..2c70315 100644
--- a/request.go
+++ b/request.go
@@ -23,22 +23,34 @@ const (
 	MethodAccess
 	MethodOpen
 	MethodCreate
+
+	MethodFileRead
+	MethodFileWrite
+	MethodFileFlock
+	MethodFileRelease
+	MethodFileGetAttr
+	MethodFileFsync
+	MethodFileTruncate
+	MethodFileChown
+	MethodFileChmod
+	MethodFileAllocate
 )
 
 type Request struct {
-	ID      int    `json:"id"`
-	Method  Method `json:"method"`
-	Path    string `json:"path"`
-	Mode    uint32
-	UID     uint32
-	GID     uint32
-	Size    uint32
-	Dev     int32
-	Flags   uint32
-	Offset  uint64
-	NewPath string `json:"newpath,omitempty"`
-	Attr    string `json:"attr,omitempty"`
-	Data    []byte `json:"data,omitempty"`
+	ID         int    `json:"id"`
+	Method     Method `json:"method"`
+	Path       string `json:"path"`
+	Mode       uint32
+	UID        uint32
+	GID        uint32
+	Size       uint32
+	Dev        int32
+	Flags      uint32
+	Offset     int64
+	NewPath    string `json:"newpath,omitempty"`
+	Attr       string `json:"attr,omitempty"`
+	Data       []byte `json:"data,omitempty"`
+	FileHandle int    `json:"handle,omitempty"`
 }
 
 type RequestCallback struct {
@@ -55,5 +67,6 @@ type Response struct {
 	Dirents    []fuse.DirEntry `json:"dirents,omitempty"`
 	LinkStr    string          `json:"linkstr,omitempty"`
 	Statfs     *fuse.StatfsOut `json:"statfs,omitempty"`
-	FileHandle *int            `json:"filehandle,omitempty"`
+	FileHandle int             `json:"filehandle,omitempty"`
+	WriteSize  int             `json:"wsize,omitempty"`
 }