Allow different PathFilesystems to be mounted within directories of

PathFileSystemConnector file system.

.gitignore

 *~
 *.6
+8.out
 .nfs*
 _*

example/main.go

@@ -21,9 +21,9 @@ func main() {
 	}
 
 	orig := flag.Arg(0)
-	pt := examplelib.NewPassThroughFuse(orig)
-	fs := fuse.NewPathFileSystemConnector(pt)
-	state := fuse.NewMountState(fs)
+	fs := examplelib.NewPassThroughFuse(orig)
+	conn := fuse.NewPathFileSystemConnector(fs)
+	state := fuse.NewMountState(conn)
 	state.Debug = *debug
 
 	mountPoint := flag.Arg(1)

examplelib/Makefile

@@ -7,7 +7,8 @@ DEPS=../fuse
 
 GOFILES=dummyfuse.go\
 	passthrough.go\
-	stackfs.go
+	stackfs.go\
+	misc.go
 
 include $(GOROOT)/src/Make.pkg
 

examplelib/dummyfuse.go

@@ -194,11 +194,11 @@ func (self *DummyPathFuse) OpenDir(name string) (dir fuse.RawFuseDir, code fuse.
 	return nil, fuse.ENOSYS
 }
 
-func (self *DummyPathFuse) Init() (*fuse.InitOut, fuse.Status) {
-	return nil, fuse.ENOSYS
+func (self *DummyPathFuse) Mount(conn *fuse.PathFileSystemConnector) (fuse.Status) {
+	return fuse.OK
 }
 
-func (self *DummyPathFuse) Destroy() {
+func (self *DummyPathFuse) Unmount() {
 }
 
 func (self *DummyPathFuse) Access(name string, mode uint32) (code fuse.Status) {
@@ -213,6 +213,3 @@ func (self *DummyPathFuse) Utimens(name string, AtimeNs uint64, CtimeNs uint64)
 	return fuse.ENOSYS
 }
 
-func (self *DummyPathFuse) SetOptions(*fuse.PathFileSystemConnectorOptions) {
-
-}

examplelib/misc.go

+package examplelib
+
+import "os"
+
+////////////////
+
+func IsDir(name string) bool {
+	fi, _ := os.Lstat(name)
+	return fi != nil && fi.IsDirectory()
+}
+
+func IsFile(name string) bool {
+	fi, _ := os.Lstat(name)
+	return fi != nil && fi.IsRegular()
+}
+
+func FileExists(name string) bool {
+	_, err := os.Lstat(name)
+	return err == nil
+}

examplelib/passthrough.go

@@ -25,11 +25,11 @@ func NewPassThroughFuse(root string) (out *PassThroughFuse) {
 	return out
 }
 
-func (self *PassThroughFuse) Init() (*fuse.InitOut, fuse.Status) {
-	return new(fuse.InitOut), fuse.OK
+func (self *PassThroughFuse) Mount(conn *fuse.PathFileSystemConnector) (fuse.Status) {
+	return fuse.OK
 }
 
-func (self *PassThroughFuse) Destroy() {
+func (self *PassThroughFuse) Unmount() {
 
 }
 

examplelib/passthrough_test.go

@@ -16,23 +16,6 @@ import (
 var _ = strings.Join
 var _ = log.Println
 
-////////////////
-
-func IsDir(name string) bool {
-	fi, _ := os.Lstat(name)
-	return fi != nil && fi.IsDirectory()
-}
-
-func IsFile(name string) bool {
-	fi, _ := os.Lstat(name)
-	return fi != nil && fi.IsRegular()
-}
-
-func FileExists(name string) bool {
-	_, err := os.Lstat(name)
-	return err == nil
-}
-
 ////////////////
 // state for our testcase, mostly constants
 
@@ -50,6 +33,7 @@ type testCase struct {
 	origSubfile  string
 	tester       *testing.T
 	state        *fuse.MountState
+	connector    *fuse.PathFileSystemConnector
 }
 
 // Create and mount filesystem.
@@ -68,10 +52,11 @@ func (self *testCase) Setup(t *testing.T) {
 	self.origFile = path.Join(self.origDir, name)
 	self.origSubdir = path.Join(self.origDir, subdir)
 	self.origSubfile = path.Join(self.origSubdir, "subfile")
-
-	fs := fuse.NewPathFileSystemConnector(NewPassThroughFuse(self.origDir))
-
-	self.state = fuse.NewMountState(fs)
+	
+	pfs := NewPassThroughFuse(self.origDir)
+	self.connector = fuse.NewPathFileSystemConnector(pfs)
+	self.connector.Debug = true
+	self.state = fuse.NewMountState(self.connector)
 	self.state.Mount(self.mountPoint)
 
 	//self.state.Debug = false
@@ -610,3 +595,44 @@ func TestMount(t *testing.T) {
 	ts.testLargeDirRead()
 	ts.Cleanup()
 }
+
+func TestRecursiveMount(t *testing.T) {
+	ts := new(testCase)
+	ts.Setup(t)
+
+	f, err := os.Open(path.Join(ts.mountPoint, "hello.txt"),
+		os.O_WRONLY|os.O_CREATE, 0777)
+	
+	if err != nil {
+		t.Errorf("open write err %v", err)
+	}
+	f.WriteString("bla")
+	f.Close()
+	
+	pfs2 := NewPassThroughFuse(ts.origDir)
+	code := ts.connector.Mount("/hello.txt", pfs2)
+	if code != fuse.EINVAL {
+		t.Error("expect EINVAL", code)
+	}
+
+	submnt := path.Join(ts.mountPoint, "mnt")
+	err = os.Mkdir(submnt, 0777)
+	if err != nil {
+		t.Errorf("mkdir")
+	}
+	
+	code = ts.connector.Mount("/mnt", pfs2)
+	if code != fuse.OK {
+		t.Errorf("mkdir")
+	}
+	
+	_, err = os.Lstat(submnt)
+	if err != nil {
+		t.Error("lstat submount", err)
+	}
+	_, err = os.Lstat(path.Join(submnt, "hello.txt"))
+	if err != nil {
+		t.Error("lstat submount/file", err)
+	}
+	ts.Cleanup()
+}

examplelib/stackfs_test.go

@@ -43,7 +43,7 @@ func (self *stackFsTestCase) Setup(t *testing.T) {
 
 	fs1 := fuse.NewPathFileSystemConnector(NewPassThroughFuse(self.origDir1))
 	fs2 := fuse.NewPathFileSystemConnector(NewPassThroughFuse(self.origDir2))
-
+	
 	self.fs = NewSubmountFileSystem()
 
 	attr := fuse.Attr{

fuse/direntry.go

@@ -31,7 +31,7 @@ func (de *DirEntryList) Add(name []byte, inode uint64, mode uint32) bool {
 	dirent.Off = de.offset
 	dirent.Ino = inode
 	dirent.NameLen = uint32(len(name))
-	dirent.Typ = (mode & 0170000) >> 12
+	dirent.Typ = ModeToType(mode)
 
 	err := binary.Write(&de.buf, binary.LittleEndian, dirent)
 	if err != nil {

fuse/misc.go

@@ -291,3 +291,7 @@ func NegativeEntry(time float64) *EntryOut {
 	SplitNs(time, &out.EntryValid, &out.EntryValidNsec)
 	return out
 }
+
+func ModeToType(mode uint32) uint32 {
+	return (mode & 0170000) >> 12
+}

fuse/types.go

@@ -92,6 +92,9 @@ const (
 	ENOTDIR = Status(syscall.ENOTDIR)
 	EACCES  = Status(syscall.EACCES)
 	EPERM   = Status(syscall.EPERM)
+	EBUSY   = Status(syscall.EBUSY)
+	EINVAL  = Status(syscall.EINVAL)
+	EXDEV   = Status(syscall.EXDEV)
 )
 
 type Opcode int
@@ -568,14 +571,12 @@ type PathFilesystem interface {
 	OpenDir(name string) (dir RawFuseDir, code Status)
 
 	// TODO - what is a good interface?
-	Init() (*InitOut, Status)
-	Destroy()
+	Mount(connector *PathFileSystemConnector) Status
+	Unmount()
 
 	Access(name string, mode uint32) (code Status)
 	Create(name string, flags uint32, mode uint32) (file RawFuseFile, code Status)
 	Utimens(name string, AtimeNs uint64, CtimeNs uint64) (code Status)
 
 	// unimplemented: poll, ioctl, bmap.
-
-	SetOptions(*PathFileSystemConnectorOptions)
 }