swarm/api: FUSE read-write support (#13872)

- Moved fuse related code in a new package, swarm/fuse
- Added write support
  - Create new files
  - Delete existing files
  - Append to files (with limitations)
- More test coverage

8 files changed, 1730 insertions, 0 deletions

diff --git a/swarm/fuse/fuse_dir.go b/swarm/fuse/fuse_dir.go
new file mode 100644
index 000000000..91b236ae8
--- /dev/null
+++ b/swarm/fuse/fuse_dir.go
@@ -0,0 +1,155 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// +build linux darwin freebsd
+
+package fuse
+
+import (
+	"bazil.org/fuse"
+	"bazil.org/fuse/fs"
+	"golang.org/x/net/context"
+	"os"
+	"path/filepath"
+	"sync"
+)
+
+var (
+	_ fs.Node                = (*SwarmDir)(nil)
+	_ fs.NodeRequestLookuper = (*SwarmDir)(nil)
+	_ fs.HandleReadDirAller  = (*SwarmDir)(nil)
+	_ fs.NodeCreater         = (*SwarmDir)(nil)
+	_ fs.NodeRemover         = (*SwarmDir)(nil)
+	_ fs.NodeMkdirer         = (*SwarmDir)(nil)
+)
+
+type SwarmDir struct {
+	inode       uint64
+	name        string
+	path        string
+	directories []*SwarmDir
+	files       []*SwarmFile
+
+	mountInfo *MountInfo
+	lock      *sync.RWMutex
+}
+
+func NewSwarmDir(fullpath string, minfo *MountInfo) *SwarmDir {
+	newdir := &SwarmDir{
+		inode:       NewInode(),
+		name:        filepath.Base(fullpath),
+		path:        fullpath,
+		directories: []*SwarmDir{},
+		files:       []*SwarmFile{},
+		mountInfo:   minfo,
+		lock:        &sync.RWMutex{},
+	}
+	return newdir
+}
+
+func (sd *SwarmDir) Attr(ctx context.Context, a *fuse.Attr) error {
+	a.Inode = sd.inode
+	a.Mode = os.ModeDir | 0700
+	a.Uid = uint32(os.Getuid())
+	a.Gid = uint32(os.Getegid())
+	return nil
+}
+
+func (sd *SwarmDir) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.LookupResponse) (fs.Node, error) {
+
+	for _, n := range sd.files {
+		if n.name == req.Name {
+			return n, nil
+		}
+	}
+	for _, n := range sd.directories {
+		if n.name == req.Name {
+			return n, nil
+		}
+	}
+	return nil, fuse.ENOENT
+}
+
+func (sd *SwarmDir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
+	var children []fuse.Dirent
+	for _, file := range sd.files {
+		children = append(children, fuse.Dirent{Inode: file.inode, Type: fuse.DT_File, Name: file.name})
+	}
+	for _, dir := range sd.directories {
+		children = append(children, fuse.Dirent{Inode: dir.inode, Type: fuse.DT_Dir, Name: dir.name})
+	}
+	return children, nil
+}
+
+func (sd *SwarmDir) Create(ctx context.Context, req *fuse.CreateRequest, resp *fuse.CreateResponse) (fs.Node, fs.Handle, error) {
+
+	newFile := NewSwarmFile(sd.path, req.Name, sd.mountInfo)
+	newFile.fileSize = 0 // 0 means, file is not in swarm yet and it is just created
+
+	sd.lock.Lock()
+	defer sd.lock.Unlock()
+	sd.files = append(sd.files, newFile)
+
+	return newFile, newFile, nil
+}
+
+func (sd *SwarmDir) Remove(ctx context.Context, req *fuse.RemoveRequest) error {
+
+	if req.Dir && sd.directories != nil {
+		newDirs := []*SwarmDir{}
+		for _, dir := range sd.directories {
+			if dir.name == req.Name {
+				removeDirectoryFromSwarm(dir)
+			} else {
+				newDirs = append(newDirs, dir)
+			}
+		}
+		if len(sd.directories) > len(newDirs) {
+			sd.lock.Lock()
+			defer sd.lock.Unlock()
+			sd.directories = newDirs
+		}
+		return nil
+	} else if !req.Dir && sd.files != nil {
+		newFiles := []*SwarmFile{}
+		for _, f := range sd.files {
+			if f.name == req.Name {
+				removeFileFromSwarm(f)
+			} else {
+				newFiles = append(newFiles, f)
+			}
+		}
+		if len(sd.files) > len(newFiles) {
+			sd.lock.Lock()
+			defer sd.lock.Unlock()
+			sd.files = newFiles
+		}
+		return nil
+	}
+	return fuse.ENOENT
+}
+
+func (sd *SwarmDir) Mkdir(ctx context.Context, req *fuse.MkdirRequest) (fs.Node, error) {
+
+	newDir := NewSwarmDir(req.Name, sd.mountInfo)
+
+	sd.lock.Lock()
+	defer sd.lock.Unlock()
+	sd.directories = append(sd.directories, newDir)
+
+	return newDir, nil
+
+}
diff --git a/swarm/fuse/fuse_file.go b/swarm/fuse/fuse_file.go
new file mode 100644
index 000000000..0cb59dfb3
--- /dev/null
+++ b/swarm/fuse/fuse_file.go
@@ -0,0 +1,144 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// +build linux darwin freebsd
+
+package fuse
+
+import (
+	"bazil.org/fuse"
+	"bazil.org/fuse/fs"
+	"errors"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/swarm/storage"
+	"golang.org/x/net/context"
+	"io"
+	"os"
+	"sync"
+)
+
+const (
+	MaxAppendFileSize = 10485760 // 10Mb
+)
+
+var (
+	errInvalidOffset           = errors.New("Invalid offset during write")
+	errFileSizeMaxLimixReached = errors.New("File size exceeded max limit")
+)
+
+var (
+	_ fs.Node         = (*SwarmFile)(nil)
+	_ fs.HandleReader = (*SwarmFile)(nil)
+	_ fs.HandleWriter = (*SwarmFile)(nil)
+)
+
+type SwarmFile struct {
+	inode    uint64
+	name     string
+	path     string
+	key      storage.Key
+	fileSize int64
+	reader   storage.LazySectionReader
+
+	mountInfo *MountInfo
+	lock      *sync.RWMutex
+}
+
+func NewSwarmFile(path, fname string, minfo *MountInfo) *SwarmFile {
+	newFile := &SwarmFile{
+		inode:    NewInode(),
+		name:     fname,
+		path:     path,
+		key:      nil,
+		fileSize: -1, // -1 means , file already exists in swarm and you need to just get the size from swarm
+		reader:   nil,
+
+		mountInfo: minfo,
+		lock:      &sync.RWMutex{},
+	}
+	return newFile
+}
+
+func (file *SwarmFile) Attr(ctx context.Context, a *fuse.Attr) error {
+
+	a.Inode = file.inode
+	//TODO: need to get permission as argument
+	a.Mode = 0700
+	a.Uid = uint32(os.Getuid())
+	a.Gid = uint32(os.Getegid())
+
+	if file.fileSize == -1 {
+		reader := file.mountInfo.swarmApi.Retrieve(file.key)
+		quitC := make(chan bool)
+		size, err := reader.Size(quitC)
+		if err != nil {
+			log.Warn("Couldnt get size of file %s : %v", file.path, err)
+		}
+		file.fileSize = int64(size)
+	}
+	a.Size = uint64(file.fileSize)
+	return nil
+}
+
+func (sf *SwarmFile) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
+
+	sf.lock.RLock()
+	defer sf.lock.RUnlock()
+	if sf.reader == nil {
+		sf.reader = sf.mountInfo.swarmApi.Retrieve(sf.key)
+	}
+	buf := make([]byte, req.Size)
+	n, err := sf.reader.ReadAt(buf, req.Offset)
+	if err == io.ErrUnexpectedEOF || err == io.EOF {
+		err = nil
+	}
+	resp.Data = buf[:n]
+	sf.reader = nil
+	return err
+
+}
+
+func (sf *SwarmFile) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error {
+
+	if sf.fileSize == 0 && req.Offset == 0 {
+
+		// A new file is created
+		err := addFileToSwarm(sf, req.Data, len(req.Data))
+		if err != nil {
+			return err
+		}
+		resp.Size = len(req.Data)
+
+	} else if req.Offset <= sf.fileSize {
+
+		totalSize := sf.fileSize + int64(len(req.Data))
+		if totalSize > MaxAppendFileSize {
+			log.Warn("Append file size reached (%v) : (%v)", sf.fileSize, len(req.Data))
+			return errFileSizeMaxLimixReached
+		}
+
+		err := appendToExistingFileInSwarm(sf, req.Data, req.Offset, int64(len(req.Data)))
+		if err != nil {
+			return err
+		}
+		resp.Size = int(sf.fileSize)
+	} else {
+		log.Warn("Invalid write request size(%v) : off(%v)", sf.fileSize, req.Offset)
+		return errInvalidOffset
+	}
+
+	return nil
+}
diff --git a/swarm/fuse/fuse_root.go b/swarm/fuse/fuse_root.go
new file mode 100644
index 000000000..b2262d1c5
--- /dev/null
+++ b/swarm/fuse/fuse_root.go
@@ -0,0 +1,35 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// +build linux darwin freebsd
+
+package fuse
+
+import (
+	"bazil.org/fuse/fs"
+)
+
+var (
+	_ fs.Node = (*SwarmDir)(nil)
+)
+
+type SwarmRoot struct {
+	root *SwarmDir
+}
+
+func (filesystem *SwarmRoot) Root() (fs.Node, error) {
+	return filesystem.root, nil
+}
diff --git a/swarm/fuse/swarmfs.go b/swarm/fuse/swarmfs.go
new file mode 100644
index 000000000..2493bdab1
--- /dev/null
+++ b/swarm/fuse/swarmfs.go
@@ -0,0 +1,64 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package fuse
+
+import (
+	"github.com/ethereum/go-ethereum/swarm/api"
+	"sync"
+	"time"
+)
+
+const (
+	Swarmfs_Version = "0.1"
+	mountTimeout    = time.Second * 5
+	unmountTimeout  = time.Second * 10
+	maxFuseMounts   = 5
+)
+
+var (
+	swarmfs     *SwarmFS // Swarm file system singleton
+	swarmfsLock sync.Once
+
+	inode     uint64 = 1 // global inode
+	inodeLock sync.RWMutex
+)
+
+type SwarmFS struct {
+	swarmApi     *api.Api
+	activeMounts map[string]*MountInfo
+	swarmFsLock  *sync.RWMutex
+}
+
+func NewSwarmFS(api *api.Api) *SwarmFS {
+	swarmfsLock.Do(func() {
+		swarmfs = &SwarmFS{
+			swarmApi:     api,
+			swarmFsLock:  &sync.RWMutex{},
+			activeMounts: map[string]*MountInfo{},
+		}
+	})
+	return swarmfs
+
+}
+
+// Inode numbers need to be unique, they are used for caching inside fuse
+func NewInode() uint64 {
+	inodeLock.Lock()
+	defer inodeLock.Unlock()
+	inode += 1
+	return inode
+}
diff --git a/swarm/fuse/swarmfs_fallback.go b/swarm/fuse/swarmfs_fallback.go
new file mode 100644
index 000000000..4864c8689
--- /dev/null
+++ b/swarm/fuse/swarmfs_fallback.go
@@ -0,0 +1,51 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// +build !linux,!darwin,!freebsd
+
+package fuse
+
+import (
+	"errors"
+)
+
+var errNoFUSE = errors.New("FUSE is not supported on this platform")
+
+func isFUSEUnsupportedError(err error) bool {
+	return err == errNoFUSE
+}
+
+type MountInfo struct {
+	MountPoint     string
+	StartManifest  string
+	LatestManifest string
+}
+
+func (self *SwarmFS) Mount(mhash, mountpoint string) (*MountInfo, error) {
+	return nil, errNoFUSE
+}
+
+func (self *SwarmFS) Unmount(mountpoint string) (bool, error) {
+	return false, errNoFUSE
+}
+
+func (self *SwarmFS) Listmounts() ([]*MountInfo, error) {
+	return nil, errNoFUSE
+}
+
+func (self *SwarmFS) Stop() error {
+	return nil
+}
diff --git a/swarm/fuse/swarmfs_test.go b/swarm/fuse/swarmfs_test.go
new file mode 100644
index 000000000..f307b38ea
--- /dev/null
+++ b/swarm/fuse/swarmfs_test.go
@@ -0,0 +1,897 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// +build linux darwin freebsd
+
+package fuse
+
+import (
+	"bytes"
+	"crypto/rand"
+	"github.com/ethereum/go-ethereum/swarm/api"
+	"github.com/ethereum/go-ethereum/swarm/storage"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+type fileInfo struct {
+	perm     uint64
+	uid      int
+	gid      int
+	contents []byte
+}
+
+func testFuseFileSystem(t *testing.T, f func(*api.Api)) {
+
+	datadir, err := ioutil.TempDir("", "fuse")
+	if err != nil {
+		t.Fatalf("unable to create temp dir: %v", err)
+	}
+	os.RemoveAll(datadir)
+
+	dpa, err := storage.NewLocalDPA(datadir)
+	if err != nil {
+		return
+	}
+	api := api.NewApi(dpa, nil)
+	dpa.Start()
+	f(api)
+	dpa.Stop()
+}
+
+func createTestFilesAndUploadToSwarm(t *testing.T, api *api.Api, files map[string]fileInfo, uploadDir string) string {
+
+	os.RemoveAll(uploadDir)
+
+	for fname, finfo := range files {
+		actualPath := filepath.Join(uploadDir, fname)
+		filePath := filepath.Dir(actualPath)
+
+		err := os.MkdirAll(filePath, 0777)
+		if err != nil {
+			t.Fatalf("Error creating directory '%v' : %v", filePath, err)
+		}
+
+		fd, err1 := os.OpenFile(actualPath, os.O_RDWR|os.O_CREATE, os.FileMode(finfo.perm))
+		if err1 != nil {
+			t.Fatalf("Error creating file %v: %v", actualPath, err1)
+		}
+
+		fd.Write(finfo.contents)
+		fd.Chown(finfo.uid, finfo.gid)
+		fd.Chmod(os.FileMode(finfo.perm))
+		fd.Sync()
+		fd.Close()
+	}
+
+	bzzhash, err := api.Upload(uploadDir, "")
+	if err != nil {
+		t.Fatalf("Error uploading directory %v: %v", uploadDir, err)
+	}
+
+	return bzzhash
+}
+
+func mountDir(t *testing.T, api *api.Api, files map[string]fileInfo, bzzHash string, mountDir string) *SwarmFS {
+
+	// Test Mount
+	os.RemoveAll(mountDir)
+	os.MkdirAll(mountDir, 0777)
+	swarmfs := NewSwarmFS(api)
+	_, err := swarmfs.Mount(bzzHash, mountDir)
+	if isFUSEUnsupportedError(err) {
+		t.Skip("FUSE not supported:", err)
+	} else if err != nil {
+		t.Fatalf("Error mounting hash %v: %v", bzzHash, err)
+	}
+
+	found := false
+	mi := swarmfs.Listmounts()
+	for _, minfo := range mi {
+		if minfo.MountPoint == mountDir {
+			if minfo.StartManifest != bzzHash ||
+				minfo.LatestManifest != bzzHash ||
+				minfo.fuseConnection == nil {
+				t.Fatalf("Error mounting: exp(%s): act(%s)", bzzHash, minfo.StartManifest)
+			}
+			found = true
+		}
+	}
+
+	// Test listMounts
+	if found == false {
+		t.Fatalf("Error getting mounts information for %v: %v", mountDir, err)
+	}
+
+	// Check if file and their attributes are as expected
+	compareGeneratedFileWithFileInMount(t, files, mountDir)
+
+	return swarmfs
+
+}
+
+func compareGeneratedFileWithFileInMount(t *testing.T, files map[string]fileInfo, mountDir string) {
+
+	err := filepath.Walk(mountDir, func(path string, f os.FileInfo, err error) error {
+		if f.IsDir() {
+			return nil
+		}
+		fname := path[len(mountDir)+1:]
+		if _, ok := files[fname]; !ok {
+			t.Fatalf(" file %v present in mount dir and is not expected", fname)
+		}
+		return nil
+	})
+	if err != nil {
+		t.Fatalf("Error walking dir %v", mountDir)
+	}
+
+	for fname, finfo := range files {
+
+		destinationFile := filepath.Join(mountDir, fname)
+
+		dfinfo, err := os.Stat(destinationFile)
+		if err != nil {
+			t.Fatalf("Destination file %v missing in mount: %v", fname, err)
+		}
+
+		if int64(len(finfo.contents)) != dfinfo.Size() {
+			t.Fatalf("file %v Size mismatch  source (%v) vs destination(%v)", fname, int64(len(finfo.contents)), dfinfo.Size())
+		}
+
+		if dfinfo.Mode().Perm().String() != "-rwx------" {
+			t.Fatalf("file %v Permission mismatch source (-rwx------) vs destination(%v)", fname, dfinfo.Mode().Perm())
+		}
+
+		fileContents, err := ioutil.ReadFile(filepath.Join(mountDir, fname))
+		if err != nil {
+			t.Fatalf("Could not readfile %v : %v", fname, err)
+		}
+
+		if bytes.Compare(fileContents, finfo.contents) != 0 {
+			t.Fatalf("File %v contents mismatch: %v , %v", fname, fileContents, finfo.contents)
+
+		}
+
+		// TODO: check uid and gid
+	}
+}
+
+func checkFile(t *testing.T, testMountDir, fname string, contents []byte) {
+
+	destinationFile := filepath.Join(testMountDir, fname)
+	dfinfo, err1 := os.Stat(destinationFile)
+	if err1 != nil {
+		t.Fatalf("Could not stat file %v", destinationFile)
+	}
+	if dfinfo.Size() != int64(len(contents)) {
+		t.Fatalf("Mismatch in size  actual(%v) vs expected(%v)", dfinfo.Size(), int64(len(contents)))
+	}
+
+	fd, err2 := os.OpenFile(destinationFile, os.O_RDONLY, os.FileMode(0665))
+	if err2 != nil {
+		t.Fatalf("Could not open file %v", destinationFile)
+	}
+	newcontent := make([]byte, len(contents))
+	fd.Read(newcontent)
+	fd.Close()
+
+	if !bytes.Equal(contents, newcontent) {
+		t.Fatalf("File content mismatch expected (%v): received (%v) ", contents, newcontent)
+	}
+}
+
+func getRandomBtes(size int) []byte {
+	contents := make([]byte, size)
+	rand.Read(contents)
+	return contents
+
+}
+
+func IsDirEmpty(name string) bool {
+	f, err := os.Open(name)
+	if err != nil {
+		return false
+	}
+	defer f.Close()
+
+	_, err = f.Readdirnames(1)
+	if err == io.EOF {
+		return true
+	}
+	return false
+}
+
+func testMountListAndUnmount(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	testUploadDir, _ := ioutil.TempDir(os.TempDir(), "fuse-source")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "fuse-dest")
+
+	files["1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["2.txt"] = fileInfo{0711, 333, 444, getRandomBtes(10)}
+	files["3.txt"] = fileInfo{0622, 333, 444, getRandomBtes(100)}
+	files["4.txt"] = fileInfo{0533, 333, 444, getRandomBtes(1024)}
+	files["5.txt"] = fileInfo{0544, 333, 444, getRandomBtes(10)}
+	files["6.txt"] = fileInfo{0555, 333, 444, getRandomBtes(10)}
+	files["7.txt"] = fileInfo{0666, 333, 444, getRandomBtes(10)}
+	files["8.txt"] = fileInfo{0777, 333, 333, getRandomBtes(10)}
+	files["11.txt"] = fileInfo{0777, 333, 444, getRandomBtes(10)}
+	files["111.txt"] = fileInfo{0777, 333, 444, getRandomBtes(10)}
+	files["two/2.txt"] = fileInfo{0777, 333, 444, getRandomBtes(10)}
+	files["two/2/2.txt"] = fileInfo{0777, 333, 444, getRandomBtes(10)}
+	files["two/2./2.txt"] = fileInfo{0777, 444, 444, getRandomBtes(10)}
+	files["twice/2.txt"] = fileInfo{0777, 444, 333, getRandomBtes(200)}
+	files["one/two/three/four/five/six/seven/eight/nine/10.txt"] = fileInfo{0777, 333, 444, getRandomBtes(10240)}
+	files["one/two/three/four/five/six/six"] = fileInfo{0777, 333, 444, getRandomBtes(10)}
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, testUploadDir)
+
+	swarmfs := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs.Stop()
+
+	// Check unmount
+	_, err := swarmfs.Unmount(testMountDir)
+	if err != nil {
+		t.Fatalf("could not unmount  %v", bzzHash)
+	}
+	if !IsDirEmpty(testMountDir) {
+		t.Fatalf("unmount didnt work for %v", testMountDir)
+	}
+
+}
+
+func testMaxMounts(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	files["1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	uploadDir1, _ := ioutil.TempDir(os.TempDir(), "max-upload1")
+	bzzHash1 := createTestFilesAndUploadToSwarm(t, api, files, uploadDir1)
+	mount1, _ := ioutil.TempDir(os.TempDir(), "max-mount1")
+	swarmfs1 := mountDir(t, api, files, bzzHash1, mount1)
+	defer swarmfs1.Stop()
+
+	files["2.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	uploadDir2, _ := ioutil.TempDir(os.TempDir(), "max-upload2")
+	bzzHash2 := createTestFilesAndUploadToSwarm(t, api, files, uploadDir2)
+	mount2, _ := ioutil.TempDir(os.TempDir(), "max-mount2")
+	swarmfs2 := mountDir(t, api, files, bzzHash2, mount2)
+	defer swarmfs2.Stop()
+
+	files["3.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	uploadDir3, _ := ioutil.TempDir(os.TempDir(), "max-upload3")
+	bzzHash3 := createTestFilesAndUploadToSwarm(t, api, files, uploadDir3)
+	mount3, _ := ioutil.TempDir(os.TempDir(), "max-mount3")
+	swarmfs3 := mountDir(t, api, files, bzzHash3, mount3)
+	defer swarmfs3.Stop()
+
+	files["4.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	uploadDir4, _ := ioutil.TempDir(os.TempDir(), "max-upload4")
+	bzzHash4 := createTestFilesAndUploadToSwarm(t, api, files, uploadDir4)
+	mount4, _ := ioutil.TempDir(os.TempDir(), "max-mount4")
+	swarmfs4 := mountDir(t, api, files, bzzHash4, mount4)
+	defer swarmfs4.Stop()
+
+	files["5.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	uploadDir5, _ := ioutil.TempDir(os.TempDir(), "max-upload5")
+	bzzHash5 := createTestFilesAndUploadToSwarm(t, api, files, uploadDir5)
+	mount5, _ := ioutil.TempDir(os.TempDir(), "max-mount5")
+	swarmfs5 := mountDir(t, api, files, bzzHash5, mount5)
+	defer swarmfs5.Stop()
+
+	files["6.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	uploadDir6, _ := ioutil.TempDir(os.TempDir(), "max-upload6")
+	bzzHash6 := createTestFilesAndUploadToSwarm(t, api, files, uploadDir6)
+	mount6, _ := ioutil.TempDir(os.TempDir(), "max-mount6")
+
+	os.RemoveAll(mount6)
+	os.MkdirAll(mount6, 0777)
+	_, err := swarmfs.Mount(bzzHash6, mount6)
+	if err == nil {
+		t.Fatalf("Error: Going beyond max mounts  %v", bzzHash6)
+	}
+
+}
+
+func testReMounts(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	files["1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	uploadDir1, _ := ioutil.TempDir(os.TempDir(), "re-upload1")
+	bzzHash1 := createTestFilesAndUploadToSwarm(t, api, files, uploadDir1)
+	testMountDir1, _ := ioutil.TempDir(os.TempDir(), "re-mount1")
+	swarmfs := mountDir(t, api, files, bzzHash1, testMountDir1)
+	defer swarmfs.Stop()
+
+	uploadDir2, _ := ioutil.TempDir(os.TempDir(), "re-upload2")
+	bzzHash2 := createTestFilesAndUploadToSwarm(t, api, files, uploadDir2)
+	testMountDir2, _ := ioutil.TempDir(os.TempDir(), "re-mount2")
+
+	// try mounting the same hash second time
+	os.RemoveAll(testMountDir2)
+	os.MkdirAll(testMountDir2, 0777)
+	_, err := swarmfs.Mount(bzzHash1, testMountDir2)
+	if err != nil {
+		t.Fatalf("Error mounting hash  %v", bzzHash1)
+	}
+
+	// mount a different hash in already mounted point
+	_, err = swarmfs.Mount(bzzHash2, testMountDir1)
+	if err == nil {
+		t.Fatalf("Error mounting hash  %v", bzzHash2)
+	}
+
+	// mount nonexistent hash
+	_, err = swarmfs.Mount("0xfea11223344", testMountDir1)
+	if err == nil {
+		t.Fatalf("Error mounting hash  %v", bzzHash2)
+	}
+
+}
+
+func testUnmount(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	uploadDir, _ := ioutil.TempDir(os.TempDir(), "ex-upload")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "ex-mount")
+
+	files["1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, uploadDir)
+
+	swarmfs := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs.Stop()
+
+	swarmfs.Unmount(testMountDir)
+
+	mi := swarmfs.Listmounts()
+	for _, minfo := range mi {
+		if minfo.MountPoint == testMountDir {
+			t.Fatalf("mount state not cleaned up in unmount case %v", testMountDir)
+		}
+	}
+
+}
+
+func testUnmountWhenResourceBusy(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	testUploadDir, _ := ioutil.TempDir(os.TempDir(), "ex-upload")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "ex-mount")
+
+	files["1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, testUploadDir)
+
+	swarmfs := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs.Stop()
+
+	actualPath := filepath.Join(testMountDir, "2.txt")
+	d, err := os.OpenFile(actualPath, os.O_RDWR, os.FileMode(0700))
+	d.Write(getRandomBtes(10))
+
+	_, err = swarmfs.Unmount(testMountDir)
+	if err != nil {
+		t.Fatalf("could not unmount  %v", bzzHash)
+	}
+	d.Close()
+
+	mi := swarmfs.Listmounts()
+	for _, minfo := range mi {
+		if minfo.MountPoint == testMountDir {
+			t.Fatalf("mount state not cleaned up in unmount case %v", testMountDir)
+		}
+	}
+
+}
+func testSeekInMultiChunkFile(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	testUploadDir, _ := ioutil.TempDir(os.TempDir(), "seek-upload")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "seek-mount")
+
+	files["1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10240)}
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, testUploadDir)
+
+	swarmfs := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs.Stop()
+
+	// Create a new file seek the second chunk
+	actualPath := filepath.Join(testMountDir, "1.txt")
+	d, _ := os.OpenFile(actualPath, os.O_RDONLY, os.FileMode(0700))
+
+	d.Seek(5000, 0)
+
+	contents := make([]byte, 1024)
+	d.Read(contents)
+	finfo := files["1.txt"]
+
+	if bytes.Compare(finfo.contents[:6024][5000:], contents) != 0 {
+		t.Fatalf("File seek contents mismatch")
+	}
+	d.Close()
+
+}
+
+func testCreateNewFile(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	testUploadDir, _ := ioutil.TempDir(os.TempDir(), "create-upload")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "create-mount")
+
+	files["1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["five.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["six.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, testUploadDir)
+
+	swarmfs1 := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs1.Stop()
+
+	// Create a new file in the root dir and check
+	actualPath := filepath.Join(testMountDir, "2.txt")
+	d, err1 := os.OpenFile(actualPath, os.O_RDWR|os.O_CREATE, os.FileMode(0665))
+	if err1 != nil {
+		t.Fatalf("Could not create file %s : %v", actualPath, err1)
+	}
+	contents := make([]byte, 11)
+	rand.Read(contents)
+	d.Write(contents)
+	d.Close()
+
+	mi, err2 := swarmfs1.Unmount(testMountDir)
+	if err2 != nil {
+		t.Fatalf("Could not unmount %v", err2)
+	}
+
+	// mount again and see if things are okay
+	files["2.txt"] = fileInfo{0700, 333, 444, contents}
+	swarmfs2 := mountDir(t, api, files, mi.LatestManifest, testMountDir)
+	defer swarmfs2.Stop()
+
+	checkFile(t, testMountDir, "2.txt", contents)
+
+}
+
+func testCreateNewFileInsideDirectory(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	testUploadDir, _ := ioutil.TempDir(os.TempDir(), "createinsidedir-upload")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "createinsidedir-mount")
+
+	files["one/1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, testUploadDir)
+
+	swarmfs1 := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs1.Stop()
+
+	// Create a new file inside a existing dir and check
+	dirToCreate := filepath.Join(testMountDir, "one")
+	actualPath := filepath.Join(dirToCreate, "2.txt")
+	d, err1 := os.OpenFile(actualPath, os.O_RDWR|os.O_CREATE, os.FileMode(0665))
+	if err1 != nil {
+		t.Fatalf("Could not create file %s : %v", actualPath, err1)
+	}
+	contents := make([]byte, 11)
+	rand.Read(contents)
+	d.Write(contents)
+	d.Close()
+
+	mi, err2 := swarmfs1.Unmount(testMountDir)
+	if err2 != nil {
+		t.Fatalf("Could not unmount %v", err2)
+	}
+
+	// mount again and see if things are okay
+	files["one/2.txt"] = fileInfo{0700, 333, 444, contents}
+	swarmfs2 := mountDir(t, api, files, mi.LatestManifest, testMountDir)
+	defer swarmfs2.Stop()
+
+	checkFile(t, testMountDir, "one/2.txt", contents)
+
+}
+
+func testCreateNewFileInsideNewDirectory(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	testUploadDir, _ := ioutil.TempDir(os.TempDir(), "createinsidenewdir-upload")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "createinsidenewdir-mount")
+
+	files["1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, testUploadDir)
+
+	swarmfs1 := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs1.Stop()
+
+	// Create a new file inside a existing dir and check
+	dirToCreate := filepath.Join(testMountDir, "one")
+	os.MkdirAll(dirToCreate, 0777)
+	actualPath := filepath.Join(dirToCreate, "2.txt")
+	d, err1 := os.OpenFile(actualPath, os.O_RDWR|os.O_CREATE, os.FileMode(0665))
+	if err1 != nil {
+		t.Fatalf("Could not create file %s : %v", actualPath, err1)
+	}
+	contents := make([]byte, 11)
+	rand.Read(contents)
+	d.Write(contents)
+	d.Close()
+
+	mi, err2 := swarmfs1.Unmount(testMountDir)
+	if err2 != nil {
+		t.Fatalf("Could not unmount %v", err2)
+	}
+
+	// mount again and see if things are okay
+	files["one/2.txt"] = fileInfo{0700, 333, 444, contents}
+	swarmfs2 := mountDir(t, api, files, mi.LatestManifest, testMountDir)
+	defer swarmfs2.Stop()
+
+	checkFile(t, testMountDir, "one/2.txt", contents)
+
+}
+
+func testRemoveExistingFile(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	testUploadDir, _ := ioutil.TempDir(os.TempDir(), "remove-upload")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "remove-mount")
+
+	files["1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["five.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["six.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, testUploadDir)
+
+	swarmfs1 := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs1.Stop()
+
+	// Remove a file in the root dir and check
+	actualPath := filepath.Join(testMountDir, "five.txt")
+	os.Remove(actualPath)
+
+	mi, err2 := swarmfs1.Unmount(testMountDir)
+	if err2 != nil {
+		t.Fatalf("Could not unmount %v", err2)
+	}
+
+	// mount again and see if things are okay
+	delete(files, "five.txt")
+	swarmfs2 := mountDir(t, api, files, mi.LatestManifest, testMountDir)
+	defer swarmfs2.Stop()
+
+}
+
+func testRemoveExistingFileInsideADir(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	testUploadDir, _ := ioutil.TempDir(os.TempDir(), "remove-upload")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "remove-mount")
+
+	files["1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["one/five.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["one/six.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, testUploadDir)
+
+	swarmfs1 := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs1.Stop()
+
+	// Remove a file in the root dir and check
+	actualPath := filepath.Join(testMountDir, "one/five.txt")
+	os.Remove(actualPath)
+
+	mi, err2 := swarmfs1.Unmount(testMountDir)
+	if err2 != nil {
+		t.Fatalf("Could not unmount %v", err2)
+	}
+
+	// mount again and see if things are okay
+	delete(files, "one/five.txt")
+	swarmfs2 := mountDir(t, api, files, mi.LatestManifest, testMountDir)
+	defer swarmfs2.Stop()
+
+}
+
+func testRemoveNewlyAddedFile(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	testUploadDir, _ := ioutil.TempDir(os.TempDir(), "removenew-upload")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "removenew-mount")
+
+	files["1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["five.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["six.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, testUploadDir)
+
+	swarmfs1 := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs1.Stop()
+
+	// Adda a new file and remove it
+	dirToCreate := filepath.Join(testMountDir, "one")
+	os.MkdirAll(dirToCreate, os.FileMode(0665))
+	actualPath := filepath.Join(dirToCreate, "2.txt")
+	d, err1 := os.OpenFile(actualPath, os.O_RDWR|os.O_CREATE, os.FileMode(0665))
+	if err1 != nil {
+		t.Fatalf("Could not create file %s : %v", actualPath, err1)
+	}
+	contents := make([]byte, 11)
+	rand.Read(contents)
+	d.Write(contents)
+	d.Close()
+
+	checkFile(t, testMountDir, "one/2.txt", contents)
+
+	os.Remove(actualPath)
+
+	mi, err2 := swarmfs1.Unmount(testMountDir)
+	if err2 != nil {
+		t.Fatalf("Could not unmount %v", err2)
+	}
+
+	// mount again and see if things are okay
+	swarmfs2 := mountDir(t, api, files, mi.LatestManifest, testMountDir)
+	defer swarmfs2.Stop()
+
+	if bzzHash != mi.LatestManifest {
+		t.Fatalf("same contents different hash orig(%v): new(%v)", bzzHash, mi.LatestManifest)
+	}
+
+}
+
+func testAddNewFileAndModifyContents(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	testUploadDir, _ := ioutil.TempDir(os.TempDir(), "modifyfile-upload")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "modifyfile-mount")
+
+	files["1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["five.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["six.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, testUploadDir)
+
+	swarmfs1 := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs1.Stop()
+
+	// Create a new file in the root dir and check
+	actualPath := filepath.Join(testMountDir, "2.txt")
+	d, err1 := os.OpenFile(actualPath, os.O_RDWR|os.O_CREATE, os.FileMode(0665))
+	if err1 != nil {
+		t.Fatalf("Could not create file %s : %v", actualPath, err1)
+	}
+	line1 := []byte("Line 1")
+	rand.Read(line1)
+	d.Write(line1)
+	d.Close()
+
+	mi1, err2 := swarmfs1.Unmount(testMountDir)
+	if err2 != nil {
+		t.Fatalf("Could not unmount %v", err2)
+	}
+
+	// mount again and see if things are okay
+	files["2.txt"] = fileInfo{0700, 333, 444, line1}
+	swarmfs2 := mountDir(t, api, files, mi1.LatestManifest, testMountDir)
+	defer swarmfs2.Stop()
+
+	checkFile(t, testMountDir, "2.txt", line1)
+
+	mi2, err3 := swarmfs2.Unmount(testMountDir)
+	if err3 != nil {
+		t.Fatalf("Could not unmount %v", err3)
+	}
+
+	// mount again and modify
+	swarmfs3 := mountDir(t, api, files, mi2.LatestManifest, testMountDir)
+	defer swarmfs3.Stop()
+
+	fd, err4 := os.OpenFile(actualPath, os.O_RDWR|os.O_APPEND, os.FileMode(0665))
+	if err4 != nil {
+		t.Fatalf("Could not create file %s : %v", actualPath, err4)
+	}
+	line2 := []byte("Line 2")
+	rand.Read(line2)
+	fd.Seek(int64(len(line1)), 0)
+	fd.Write(line2)
+	fd.Close()
+
+	mi3, err5 := swarmfs3.Unmount(testMountDir)
+	if err5 != nil {
+		t.Fatalf("Could not unmount %v", err5)
+	}
+
+	// mount again and see if things are okay
+	b := [][]byte{line1, line2}
+	line1and2 := bytes.Join(b, []byte(""))
+	files["2.txt"] = fileInfo{0700, 333, 444, line1and2}
+	swarmfs4 := mountDir(t, api, files, mi3.LatestManifest, testMountDir)
+	defer swarmfs4.Stop()
+
+	checkFile(t, testMountDir, "2.txt", line1and2)
+
+}
+
+func testRemoveEmptyDir(api *api.Api, t *testing.T) {
+	files := make(map[string]fileInfo)
+	testUploadDir, _ := ioutil.TempDir(os.TempDir(), "rmdir-upload")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "rmdir-mount")
+
+	files["1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["five.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["six.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, testUploadDir)
+
+	swarmfs1 := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs1.Stop()
+
+	os.MkdirAll(filepath.Join(testMountDir, "newdir"), 0777)
+
+	mi, err3 := swarmfs1.Unmount(testMountDir)
+	if err3 != nil {
+		t.Fatalf("Could not unmount %v", err3)
+	}
+
+	if bzzHash != mi.LatestManifest {
+		t.Fatalf("same contents different hash orig(%v): new(%v)", bzzHash, mi.LatestManifest)
+	}
+
+}
+
+func testRemoveDirWhichHasFiles(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	testUploadDir, _ := ioutil.TempDir(os.TempDir(), "rmdir-upload")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "rmdir-mount")
+
+	files["one/1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["two/five.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["two/six.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, testUploadDir)
+
+	swarmfs1 := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs1.Stop()
+
+	dirPath := filepath.Join(testMountDir, "two")
+	os.RemoveAll(dirPath)
+
+	mi, err2 := swarmfs1.Unmount(testMountDir)
+	if err2 != nil {
+		t.Fatalf("Could not unmount %v ", err2)
+	}
+
+	// mount again and see if things are okay
+	delete(files, "two/five.txt")
+	delete(files, "two/six.txt")
+
+	swarmfs2 := mountDir(t, api, files, mi.LatestManifest, testMountDir)
+	defer swarmfs2.Stop()
+
+}
+
+func testRemoveDirWhichHasSubDirs(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	testUploadDir, _ := ioutil.TempDir(os.TempDir(), "rmsubdir-upload")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "rmsubdir-mount")
+
+	files["one/1.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["two/three/2.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["two/three/3.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["two/four/5.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["two/four/6.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+	files["two/four/six/7.txt"] = fileInfo{0700, 333, 444, getRandomBtes(10)}
+
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, testUploadDir)
+
+	swarmfs1 := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs1.Stop()
+
+	dirPath := filepath.Join(testMountDir, "two")
+	os.RemoveAll(dirPath)
+
+	mi, err2 := swarmfs1.Unmount(testMountDir)
+	if err2 != nil {
+		t.Fatalf("Could not unmount %v ", err2)
+	}
+
+	// mount again and see if things are okay
+	delete(files, "two/three/2.txt")
+	delete(files, "two/three/3.txt")
+	delete(files, "two/four/5.txt")
+	delete(files, "two/four/6.txt")
+	delete(files, "two/four/six/7.txt")
+
+	swarmfs2 := mountDir(t, api, files, mi.LatestManifest, testMountDir)
+	defer swarmfs2.Stop()
+
+}
+
+func testAppendFileContentsToEnd(api *api.Api, t *testing.T) {
+
+	files := make(map[string]fileInfo)
+	testUploadDir, _ := ioutil.TempDir(os.TempDir(), "appendlargefile-upload")
+	testMountDir, _ := ioutil.TempDir(os.TempDir(), "appendlargefile-mount")
+
+	line1 := make([]byte, 10)
+	rand.Read(line1)
+	files["1.txt"] = fileInfo{0700, 333, 444, line1}
+	bzzHash := createTestFilesAndUploadToSwarm(t, api, files, testUploadDir)
+
+	swarmfs1 := mountDir(t, api, files, bzzHash, testMountDir)
+	defer swarmfs1.Stop()
+
+	actualPath := filepath.Join(testMountDir, "1.txt")
+	fd, err4 := os.OpenFile(actualPath, os.O_RDWR|os.O_APPEND, os.FileMode(0665))
+	if err4 != nil {
+		t.Fatalf("Could not create file %s : %v", actualPath, err4)
+	}
+	line2 := make([]byte, 5)
+	rand.Read(line2)
+	fd.Seek(int64(len(line1)), 0)
+	fd.Write(line2)
+	fd.Close()
+
+	mi1, err5 := swarmfs1.Unmount(testMountDir)
+	if err5 != nil {
+		t.Fatalf("Could not unmount %v ", err5)
+	}
+
+	// mount again and see if things are okay
+	b := [][]byte{line1, line2}
+	line1and2 := bytes.Join(b, []byte(""))
+	files["1.txt"] = fileInfo{0700, 333, 444, line1and2}
+	swarmfs2 := mountDir(t, api, files, mi1.LatestManifest, testMountDir)
+	defer swarmfs2.Stop()
+
+	checkFile(t, testMountDir, "1.txt", line1and2)
+
+}
+
+func TestSwarmFileSystem(t *testing.T) {
+	testFuseFileSystem(t, func(api *api.Api) {
+
+		testMountListAndUnmount(api, t)
+
+		testMaxMounts(api, t)
+
+		testReMounts(api, t)
+
+		testUnmount(api, t)
+
+		testUnmountWhenResourceBusy(api, t)
+
+		testSeekInMultiChunkFile(api, t)
+
+		testCreateNewFile(api, t)
+
+		testCreateNewFileInsideDirectory(api, t)
+
+		testCreateNewFileInsideNewDirectory(api, t)
+
+		testRemoveExistingFile(api, t)
+
+		testRemoveExistingFileInsideADir(api, t)
+
+		testRemoveNewlyAddedFile(api, t)
+
+		testAddNewFileAndModifyContents(api, t)
+
+		testRemoveEmptyDir(api, t)
+
+		testRemoveDirWhichHasFiles(api, t)
+
+		testRemoveDirWhichHasSubDirs(api, t)
+
+		testAppendFileContentsToEnd(api, t)
+
+	})
+}
diff --git a/swarm/fuse/swarmfs_unix.go b/swarm/fuse/swarmfs_unix.go
new file mode 100644
index 000000000..f4eecef24
--- /dev/null
+++ b/swarm/fuse/swarmfs_unix.go
@@ -0,0 +1,240 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// +build linux darwin freebsd
+
+package fuse
+
+import (
+	"bazil.org/fuse"
+	"bazil.org/fuse/fs"
+	"errors"
+	"fmt"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/swarm/api"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+)
+
+var (
+	errEmptyMountPoint = errors.New("need non-empty mount point")
+	errMaxMountCount   = errors.New("max FUSE mount count reached")
+	errMountTimeout    = errors.New("mount timeout")
+	errAlreadyMounted  = errors.New("mount point is already serving")
+)
+
+func isFUSEUnsupportedError(err error) bool {
+	if perr, ok := err.(*os.PathError); ok {
+		return perr.Op == "open" && perr.Path == "/dev/fuse"
+	}
+	return err == fuse.ErrOSXFUSENotFound
+}
+
+// information about every active mount
+type MountInfo struct {
+	MountPoint     string
+	StartManifest  string
+	LatestManifest string
+	rootDir        *SwarmDir
+	fuseConnection *fuse.Conn
+	swarmApi       *api.Api
+	lock           *sync.RWMutex
+}
+
+// Inode numbers need to be unique, they are used for caching inside fuse
+func newInode() uint64 {
+	inodeLock.Lock()
+	defer inodeLock.Unlock()
+	inode += 1
+	return inode
+}
+
+func NewMountInfo(mhash, mpoint string, sapi *api.Api) *MountInfo {
+	newMountInfo := &MountInfo{
+		MountPoint:     mpoint,
+		StartManifest:  mhash,
+		LatestManifest: mhash,
+		rootDir:        nil,
+		fuseConnection: nil,
+		swarmApi:       sapi,
+		lock:           &sync.RWMutex{},
+	}
+	return newMountInfo
+}
+
+func (self *SwarmFS) Mount(mhash, mountpoint string) (*MountInfo, error) {
+
+	if mountpoint == "" {
+		return nil, errEmptyMountPoint
+	}
+	cleanedMountPoint, err := filepath.Abs(filepath.Clean(mountpoint))
+	if err != nil {
+		return nil, err
+	}
+
+	self.swarmFsLock.Lock()
+	defer self.swarmFsLock.Unlock()
+
+	noOfActiveMounts := len(self.activeMounts)
+	if noOfActiveMounts >= maxFuseMounts {
+		return nil, errMaxMountCount
+	}
+
+	if _, ok := self.activeMounts[cleanedMountPoint]; ok {
+		return nil, errAlreadyMounted
+	}
+
+	log.Info(fmt.Sprintf("Attempting to mount %s ", cleanedMountPoint))
+	key, manifestEntryMap, err := self.swarmApi.BuildDirectoryTree(mhash, true)
+	if err != nil {
+		return nil, err
+	}
+
+	mi := NewMountInfo(mhash, cleanedMountPoint, self.swarmApi)
+
+	dirTree := map[string]*SwarmDir{}
+	rootDir := NewSwarmDir("/", mi)
+	dirTree["/"] = rootDir
+	mi.rootDir = rootDir
+
+	for suffix, entry := range manifestEntryMap {
+
+		key = common.Hex2Bytes(entry.Hash)
+		fullpath := "/" + suffix
+		basepath := filepath.Dir(fullpath)
+
+		parentDir := rootDir
+		dirUntilNow := ""
+		paths := strings.Split(basepath, "/")
+		for i := range paths {
+			if paths[i] != "" {
+				thisDir := paths[i]
+				dirUntilNow = dirUntilNow + "/" + thisDir
+
+				if _, ok := dirTree[dirUntilNow]; !ok {
+					dirTree[dirUntilNow] = NewSwarmDir(dirUntilNow, mi)
+					parentDir.directories = append(parentDir.directories, dirTree[dirUntilNow])
+					parentDir = dirTree[dirUntilNow]
+
+				} else {
+					parentDir = dirTree[dirUntilNow]
+				}
+
+			}
+		}
+		thisFile := NewSwarmFile(basepath, filepath.Base(fullpath), mi)
+		thisFile.key = key
+
+		parentDir.files = append(parentDir.files, thisFile)
+	}
+
+	fconn, err := fuse.Mount(cleanedMountPoint, fuse.FSName("swarmfs"), fuse.VolumeName(mhash))
+	if isFUSEUnsupportedError(err) {
+		log.Warn("Fuse not installed", "mountpoint", cleanedMountPoint, "err", err)
+		return nil, err
+	} else if err != nil {
+		fuse.Unmount(cleanedMountPoint)
+		log.Warn("Error mounting swarm manifest", "mountpoint", cleanedMountPoint, "err", err)
+		return nil, err
+	}
+	mi.fuseConnection = fconn
+
+	serverr := make(chan error, 1)
+	go func() {
+		log.Info(fmt.Sprintf("Serving %s at %s", mhash, cleanedMountPoint))
+		filesys := &SwarmRoot{root: rootDir}
+		if err := fs.Serve(fconn, filesys); err != nil {
+			log.Warn(fmt.Sprintf("Could not Serve SwarmFileSystem error: %v", err))
+			serverr <- err
+		}
+
+	}()
+
+	// Check if the mount process has an error to report.
+	select {
+	case <-time.After(mountTimeout):
+		fuse.Unmount(cleanedMountPoint)
+		return nil, errMountTimeout
+
+	case err := <-serverr:
+		fuse.Unmount(cleanedMountPoint)
+		log.Warn("Error serving swarm FUSE FS", "mountpoint", cleanedMountPoint, "err", err)
+		return nil, err
+
+	case <-fconn.Ready:
+		log.Info("Now serving swarm FUSE FS", "manifest", mhash, "mountpoint", cleanedMountPoint)
+	}
+
+	self.activeMounts[cleanedMountPoint] = mi
+	return mi, nil
+}
+
+func (self *SwarmFS) Unmount(mountpoint string) (*MountInfo, error) {
+
+	self.swarmFsLock.Lock()
+	defer self.swarmFsLock.Unlock()
+
+	cleanedMountPoint, err := filepath.Abs(filepath.Clean(mountpoint))
+	if err != nil {
+		return nil, err
+	}
+
+	mountInfo := self.activeMounts[cleanedMountPoint]
+
+	if mountInfo == nil || mountInfo.MountPoint != cleanedMountPoint {
+		return nil, fmt.Errorf("%s is not mounted", cleanedMountPoint)
+	}
+	err = fuse.Unmount(cleanedMountPoint)
+	if err != nil {
+		err1 := externalUnMount(cleanedMountPoint)
+		if err1 != nil {
+			errStr := fmt.Sprintf("UnMount error: %v", err)
+			log.Warn(errStr)
+			return nil, err1
+		}
+	}
+
+	mountInfo.fuseConnection.Close()
+	delete(self.activeMounts, cleanedMountPoint)
+
+	succString := fmt.Sprintf("UnMounting %v succeeded", cleanedMountPoint)
+	log.Info(succString)
+
+	return mountInfo, nil
+}
+
+func (self *SwarmFS) Listmounts() []*MountInfo {
+	self.swarmFsLock.RLock()
+	defer self.swarmFsLock.RUnlock()
+
+	rows := make([]*MountInfo, 0, len(self.activeMounts))
+	for _, mi := range self.activeMounts {
+		rows = append(rows, mi)
+	}
+	return rows
+}
+
+func (self *SwarmFS) Stop() bool {
+	for mp := range self.activeMounts {
+		mountInfo := self.activeMounts[mp]
+		self.Unmount(mountInfo.MountPoint)
+	}
+	return true
+}
diff --git a/swarm/fuse/swarmfs_util.go b/swarm/fuse/swarmfs_util.go
new file mode 100644
index 000000000..d20ab258e
--- /dev/null
+++ b/swarm/fuse/swarmfs_util.go
@@ -0,0 +1,144 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// +build linux darwin freebsd
+
+package fuse
+
+import (
+	"fmt"
+	"github.com/ethereum/go-ethereum/log"
+	"os/exec"
+	"runtime"
+	"time"
+)
+
+func externalUnMount(mountPoint string) error {
+
+	var cmd *exec.Cmd
+
+	switch runtime.GOOS {
+
+	case "darwin":
+		cmd = exec.Command("/usr/bin/diskutil", "umount", "force", mountPoint)
+
+	case "linux":
+		cmd = exec.Command("fusermount", "-u", mountPoint)
+
+	default:
+		return fmt.Errorf("unmount: unimplemented")
+	}
+
+	errc := make(chan error, 1)
+	go func() {
+		defer close(errc)
+
+		if err := exec.Command("umount", mountPoint).Run(); err == nil {
+			return
+		}
+		errc <- cmd.Run()
+	}()
+
+	select {
+
+	case <-time.After(unmountTimeout):
+		return fmt.Errorf("umount timeout")
+
+	case err := <-errc:
+		return err
+	}
+}
+
+func addFileToSwarm(sf *SwarmFile, content []byte, size int) error {
+
+	fkey, mhash, err := sf.mountInfo.swarmApi.AddFile(sf.mountInfo.LatestManifest, sf.path, sf.name, content, true)
+	if err != nil {
+		return err
+	}
+
+	sf.lock.Lock()
+	defer sf.lock.Unlock()
+	sf.key = fkey
+	sf.fileSize = int64(size)
+
+	sf.mountInfo.lock.Lock()
+	defer sf.mountInfo.lock.Unlock()
+	sf.mountInfo.LatestManifest = mhash
+
+	log.Info("Added new file:", "fname", sf.name, "New Manifest hash", mhash)
+	return nil
+
+}
+
+func removeFileFromSwarm(sf *SwarmFile) error {
+
+	mkey, err := sf.mountInfo.swarmApi.RemoveFile(sf.mountInfo.LatestManifest, sf.path, sf.name, true)
+	if err != nil {
+		return err
+	}
+
+	sf.mountInfo.lock.Lock()
+	defer sf.mountInfo.lock.Unlock()
+	sf.mountInfo.LatestManifest = mkey
+
+	log.Info("Removed file:", "fname", sf.name, "New Manifest hash", mkey)
+	return nil
+}
+
+func removeDirectoryFromSwarm(sd *SwarmDir) error {
+
+	if len(sd.directories) == 0 && len(sd.files) == 0 {
+		return nil
+	}
+
+	for _, d := range sd.directories {
+		err := removeDirectoryFromSwarm(d)
+		if err != nil {
+			return err
+		}
+	}
+
+	for _, f := range sd.files {
+		err := removeFileFromSwarm(f)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+
+}
+
+func appendToExistingFileInSwarm(sf *SwarmFile, content []byte, offset int64, length int64) error {
+
+	fkey, mhash, err := sf.mountInfo.swarmApi.AppendFile(sf.mountInfo.LatestManifest, sf.path, sf.name, sf.fileSize, content, sf.key, offset, length, true)
+	if err != nil {
+		return err
+	}
+
+	sf.lock.Lock()
+	defer sf.lock.Unlock()
+	sf.key = fkey
+	sf.fileSize = sf.fileSize + int64(len(content))
+
+	sf.mountInfo.lock.Lock()
+	defer sf.mountInfo.lock.Unlock()
+	sf.mountInfo.LatestManifest = mhash
+
+	log.Info("Appended file:", "fname", sf.name, "New Manifest hash", mhash)
+	return nil
+
+}