Merge branch 'master' into t

* master:
  fixup! rename NodeAttr to StableAttr
  rename NodeAttr to StableAttr
  internal: fix access for root user
  tarfs: handle empty directories, handle more file types
  nodefs: add Attr to MemSymlink
  nodefs: protect dirsteam overflow with lock
  nodefs: add TestReadDirStress
  nodefs: protect against double close
  newunionfs: run PosixTest tests.
  newunionfs: symlink/readlink
  posixtest: export list of tests
  nodefs: handle unimplemented Mkdir
  newunionfs: a new unionfs implementation
  fuse: fix SupportsVersion
  nodefs: skip tests if kernel doesn't support lseek/copy_file_range
  posixtest: new package for generic file system tests
  update go modules.
  nodefs: add EntryOut to Create signature
  nodefs: add Inode.IsDir
  nodefs: implement Setattr in loopback

benchmark/statfs.go

@@ -51,7 +51,7 @@ func (r *StatFS) addFile(name string, a fuse.Attr) {
 		if ch == nil {
 			// Create a directory
 			ch = p.NewPersistentInode(context.Background(), &nodefs.Inode{},
-				nodefs.NodeAttr{Mode: syscall.S_IFDIR})
+				nodefs.StableAttr{Mode: syscall.S_IFDIR})
 			// Add it
 			p.AddChild(component, ch, true)
 		}
@@ -63,7 +63,7 @@ func (r *StatFS) addFile(name string, a fuse.Attr) {
 	child := p.NewPersistentInode(context.Background(), &nodefs.MemRegularFile{
 		Data: make([]byte, a.Size),
 		Attr: a,
-	}, nodefs.NodeAttr{})
+	}, nodefs.StableAttr{})
 
 	// And add it
 	p.AddChild(base, child, true)

example/hello/main.go

@@ -27,7 +27,7 @@ func (r *HelloRoot) OnAdd(ctx context.Context) {
 			Attr: fuse.Attr{
 				Mode: 0644,
 			},
-		}, nodefs.NodeAttr{Ino: 2})
+		}, nodefs.StableAttr{Ino: 2})
 	r.AddChild("file.txt", ch, false)
 }
 

fuse/opcode.go

@@ -58,8 +58,8 @@ const (
 	_OP_FALLOCATE       = uint32(43) // protocol version 19.
 	_OP_READDIRPLUS     = uint32(44) // protocol version 21.
 	_OP_RENAME2         = uint32(45) // protocol version 23.
-	_OP_LSEEK           = uint32(46)
-	_OP_COPY_FILE_RANGE = uint32(47)
+	_OP_LSEEK           = uint32(46) // protocol version 24
+	_OP_COPY_FILE_RANGE = uint32(47) // protocol version 28.
 
 	// The following entries don't have to be compatible across Go-FUSE versions.
 	_OP_NOTIFY_INVAL_ENTRY    = uint32(100)

fuse/request_linux.go

@@ -9,5 +9,5 @@ const outputHeaderSize = 160
 const (
 	_FUSE_KERNEL_VERSION   = 7
 	_MINIMUM_MINOR_VERSION = 12
-	_OUR_MINOR_VERSION     = 23
+	_OUR_MINOR_VERSION     = 28
 )

fuse/server.go

@@ -817,7 +817,7 @@ func (ms *Server) EntryNotify(parent uint64, name string) Status {
 // SupportsVersion returns true if the kernel supports the given
 // protocol version or newer.
 func (in *InitIn) SupportsVersion(maj, min uint32) bool {
-	return in.Major >= maj || (in.Major == maj && in.Minor >= min)
+	return in.Major > maj || (in.Major == maj && in.Minor >= min)
 }
 
 // SupportsNotify returns whether a certain notification type is

go.mod

 module github.com/hanwen/go-fuse
 
-require golang.org/x/sys v0.0.0-20180830151530-49385e6e1522
+require (
+	github.com/kylelemons/godebug v0.0.0-20170820004349-d65d576e9348
+	golang.org/x/sys v0.0.0-20180830151530-49385e6e1522
+)

go.sum

+github.com/kylelemons/godebug v0.0.0-20170820004349-d65d576e9348 h1:MtvEpTB6LX3vkb4ax0b5D2DHbNAUsen0Gx5wZoq3lV4=
+github.com/kylelemons/godebug v0.0.0-20170820004349-d65d576e9348/go.mod h1:B69LEHPfb2qLo0BaaOLcbitczOKLWTsrBG9LczfCD4k=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522 h1:Ve1ORMCxvRmSXBwJK+t3Oy+V2vRW2OetUQBq4rJIkZE=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=

internal/access.go

@@ -12,6 +12,10 @@ import (
 // HasAccess tests if a caller can access a file with permissions
 // `perm` in mode `mask`
 func HasAccess(callerUid, callerGid, fileUid, fileGid uint32, perm uint32, mask uint32) bool {
+	if callerUid == 0 {
+		// root can do anything.
+		return true
+	}
 	mask = mask & 7
 	if mask == 0 {
 		return true

internal/access_test.go

@@ -63,6 +63,7 @@ func TestHasAccess(t *testing.T) {
 		{myUid, myGid, myUid + 1, notMyGid, 0020, 002, false},
 		{myUid, myGid, myUid, myGid, 0000, 01, false},
 		{myUid, myGid, myUid, myGid, 0200, 01, false},
+		{0, myGid, myUid + 1, notMyGid, 0700, 01, true},
 	} {
 		got := HasAccess(tc.uid, tc.gid, tc.fuid, tc.fgid, tc.perm, tc.mask)
 		if got != tc.want {

newunionfs/unionfs.go

+// Copyright 2019 the Go-FUSE Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package unionfs
+
+import (
+	"context"
+	"crypto/md5"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"path/filepath"
+	"syscall"
+
+	"github.com/hanwen/go-fuse/fuse"
+	"github.com/hanwen/go-fuse/nodefs"
+)
+
+func filePathHash(path string) string {
+	dir, base := filepath.Split(path)
+
+	h := md5.New()
+	h.Write([]byte(dir))
+	return fmt.Sprintf("%x-%s", h.Sum(nil)[:8], base)
+}
+
+type unionFSRoot struct {
+	unionFSNode
+
+	roots []string
+}
+
+type unionFSNode struct {
+	nodefs.Inode
+}
+
+const delDir = "DELETIONS"
+
+func (r *unionFSRoot) rmMarker(name string) syscall.Errno {
+	err := syscall.Unlink(r.markerPath(name))
+	if err != nil {
+		return err.(syscall.Errno)
+	}
+	return 0
+}
+
+func (r *unionFSRoot) writeMarker(name string) syscall.Errno {
+	dir := filepath.Join(r.roots[0], delDir)
+	var st syscall.Stat_t
+	if err := syscall.Stat(dir, &st); err == syscall.ENOENT {
+		if err := syscall.Mkdir(dir, 0755); err != nil {
+			log.Printf("Mkdir %q: %v", dir, err)
+			return syscall.EIO
+		}
+	} else if err != nil {
+		return err.(syscall.Errno)
+	}
+
+	dest := r.markerPath(name)
+
+	err := ioutil.WriteFile(dest, []byte(name), 0644)
+	return nodefs.ToErrno(err)
+}
+
+func (r *unionFSRoot) markerPath(name string) string {
+	return filepath.Join(r.roots[0], delDir, filePathHash(name))
+}
+
+func (r *unionFSRoot) isDeleted(name string) bool {
+	var st syscall.Stat_t
+	err := syscall.Stat(r.markerPath(name), &st)
+	return err == nil
+}
+
+func (n *unionFSNode) root() *unionFSRoot {
+	return n.Root().Operations().(*unionFSRoot)
+}
+
+var _ = (nodefs.Setattrer)((*unionFSNode)(nil))
+
+func (n *unionFSNode) Setattr(ctx context.Context, fh nodefs.FileHandle, in *fuse.SetAttrIn, out *fuse.AttrOut) syscall.Errno {
+	if errno := n.promote(); errno != 0 {
+		return errno
+	}
+
+	if fh != nil {
+		return fh.(nodefs.FileSetattrer).Setattr(ctx, in, out)
+	}
+
+	p := filepath.Join(n.root().roots[0], n.Path(nil))
+	fsa, ok := fh.(nodefs.FileSetattrer)
+	if ok && fsa != nil {
+		fsa.Setattr(ctx, in, out)
+	} else {
+		if m, ok := in.GetMode(); ok {
+			if err := syscall.Chmod(p, m); err != nil {
+				return nodefs.ToErrno(err)
+			}
+		}
+
+		uid, uok := in.GetUID()
+		gid, gok := in.GetGID()
+		if uok || gok {
+			suid := -1
+			sgid := -1
+			if uok {
+				suid = int(uid)
+			}
+			if gok {
+				sgid = int(gid)
+			}
+			if err := syscall.Chown(p, suid, sgid); err != nil {
+				return nodefs.ToErrno(err)
+			}
+		}
+
+		mtime, mok := in.GetMTime()
+		atime, aok := in.GetATime()
+
+		if mok || aok {
+
+			ap := &atime
+			mp := &mtime
+			if !aok {
+				ap = nil
+			}
+			if !mok {
+				mp = nil
+			}
+			var ts [2]syscall.Timespec
+			ts[0] = fuse.UtimeToTimespec(ap)
+			ts[1] = fuse.UtimeToTimespec(mp)
+
+			if err := syscall.UtimesNano(p, ts[:]); err != nil {
+				return nodefs.ToErrno(err)
+			}
+		}
+
+		if sz, ok := in.GetSize(); ok {
+			if err := syscall.Truncate(p, int64(sz)); err != nil {
+				return nodefs.ToErrno(err)
+			}
+		}
+	}
+
+	fga, ok := fh.(nodefs.FileGetattrer)
+	if ok && fga != nil {
+		fga.Getattr(ctx, out)
+	} else {
+		st := syscall.Stat_t{}
+		err := syscall.Lstat(p, &st)
+		if err != nil {
+			return nodefs.ToErrno(err)
+		}
+		out.FromStat(&st)
+	}
+	return 0
+}
+
+var _ = (nodefs.Creater)((*unionFSNode)(nil))
+
+func (n *unionFSNode) Create(ctx context.Context, name string, flags uint32, mode uint32, out *fuse.EntryOut) (*nodefs.Inode, nodefs.FileHandle, uint32, syscall.Errno) {
+	var st syscall.Stat_t
+	dirName, idx := n.getBranch(&st)
+	if idx > 0 {
+		if errno := n.promote(); errno != 0 {
+			return nil, nil, 0, errno
+		}
+		idx = 0
+	}
+	fullPath := filepath.Join(dirName, name)
+	r := n.root()
+	if errno := r.rmMarker(fullPath); errno != 0 && errno != syscall.ENOENT {
+		return nil, nil, 0, errno
+	}
+
+	abs := filepath.Join(n.root().roots[0], fullPath)
+	fd, err := syscall.Creat(abs, mode)
+	if err != nil {
+		return nil, nil, 0, err.(syscall.Errno)
+	}
+
+	if err := syscall.Fstat(fd, &st); err != nil {
+		// now what?
+		syscall.Close(fd)
+		syscall.Unlink(abs)
+		return nil, nil, 0, err.(syscall.Errno)
+	}
+
+	ch := n.NewInode(ctx, &unionFSNode{}, nodefs.StableAttr{Mode: st.Mode, Ino: st.Ino})
+	out.FromStat(&st)
+
+	return ch, nodefs.NewLoopbackFile(fd), 0, 0
+}
+
+var _ = (nodefs.Opener)((*unionFSNode)(nil))
+
+func (n *unionFSNode) Open(ctx context.Context, flags uint32) (nodefs.FileHandle, uint32, syscall.Errno) {
+	isWR := (flags&syscall.O_RDWR != 0) || (flags&syscall.O_WRONLY != 0)
+
+	var st syscall.Stat_t
+	nm, idx := n.getBranch(&st)
+	if isWR && idx > 0 {
+		if errno := n.promote(); errno != 0 {
+			return nil, 0, errno
+		}
+		idx = 0
+	}
+
+	fd, err := syscall.Open(filepath.Join(n.root().roots[idx], nm), int(flags), 0)
+	if err != nil {
+		return nil, 0, err.(syscall.Errno)
+	}
+
+	return nodefs.NewLoopbackFile(fd), 0, 0
+}
+
+var _ = (nodefs.Getattrer)((*unionFSNode)(nil))
+
+func (n *unionFSNode) Getattr(ctx context.Context, fh nodefs.FileHandle, out *fuse.AttrOut) syscall.Errno {
+	var st syscall.Stat_t
+	_, idx := n.getBranch(&st)
+	if idx < 0 {
+		return syscall.ENOENT
+	}
+
+	out.FromStat(&st)
+	return 0
+}
+
+var _ = (nodefs.Lookuper)((*unionFSNode)(nil))
+
+func (n *unionFSNode) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*nodefs.Inode, syscall.Errno) {
+	var st syscall.Stat_t
+
+	p := filepath.Join(n.Path(nil), name)
+	idx := n.root().getBranch(p, &st)
+	if idx >= 0 {
+		// XXX use idx in Ino?
+		ch := n.NewInode(ctx, &unionFSNode{}, nodefs.StableAttr{Mode: st.Mode, Ino: st.Ino})
+		out.FromStat(&st)
+		out.Mode |= 0111
+		return ch, 0
+	}
+	return nil, syscall.ENOENT
+}
+
+var _ = (nodefs.Unlinker)((*unionFSNode)(nil))
+
+func (n *unionFSNode) Unlink(ctx context.Context, name string) syscall.Errno {
+	return n.root().delPath(filepath.Join(n.Path(nil), name))
+}
+
+var _ = (nodefs.Rmdirer)((*unionFSNode)(nil))
+
+func (n *unionFSNode) Rmdir(ctx context.Context, name string) syscall.Errno {
+	return n.root().delPath(filepath.Join(n.Path(nil), name))
+}
+
+var _ = (nodefs.Symlinker)((*unionFSNode)(nil))
+
+func (n *unionFSNode) Symlink(ctx context.Context, target, name string, out *fuse.EntryOut) (*nodefs.Inode, syscall.Errno) {
+	n.promote()
+	path := filepath.Join(n.root().roots[0], n.Path(nil), name)
+	err := syscall.Symlink(target, path)
+
+	if err != nil {
+		return nil, err.(syscall.Errno)
+	}
+
+	var st syscall.Stat_t
+	if err := syscall.Lstat(path, &st); err != nil {
+		return nil, err.(syscall.Errno)
+	}
+
+	out.FromStat(&st)
+
+	ch := n.NewInode(ctx, &unionFSNode{}, nodefs.StableAttr{
+		Mode: syscall.S_IFLNK,
+		Ino:  st.Ino,
+	})
+	return ch, 0
+}
+
+var _ = (nodefs.Readlinker)((*unionFSNode)(nil))
+
+func (n *unionFSNode) Readlink(ctx context.Context) ([]byte, syscall.Errno) {
+	nm, idx := n.getBranch(nil)
+
+	var buf [1024]byte
+	count, err := syscall.Readlink(filepath.Join(n.root().roots[idx], nm), buf[:])
+	if err != nil {
+		return nil, err.(syscall.Errno)
+	}
+
+	return buf[:count], 0
+}
+
+// getBranch returns the root where we can find the given file. It
+// will check the deletion markers in roots[0].
+func (n *unionFSNode) getBranch(st *syscall.Stat_t) (string, int) {
+	name := n.Path(nil)
+	return name, n.root().getBranch(name, st)
+}
+
+func (r *unionFSRoot) getBranch(name string, st *syscall.Stat_t) int {
+	if r.isDeleted(name) {
+		return -1
+	}
+	if st == nil {
+		st = &syscall.Stat_t{}
+	}
+	for i, root := range r.roots {
+		p := filepath.Join(root, name)
+		err := syscall.Lstat(p, st)
+		if err == nil {
+			return i
+		}
+	}
+	return -1
+}
+
+func (n *unionFSRoot) delPath(p string) syscall.Errno {
+	var st syscall.Stat_t
+	r := n.root()
+	idx := r.getBranch(p, &st)
+
+	if idx < 0 {
+		return 0
+	}
+	if idx == 0 {
+		err := syscall.Unlink(filepath.Join(r.roots[idx], p))
+		if err != nil {
+			return nodefs.ToErrno(err)
+		}
+		idx = r.getBranch(p, &st)
+	}
+	if idx > 0 {
+		return r.writeMarker(p)
+	}
+
+	return 0
+}
+
+func (n *unionFSNode) promote() syscall.Errno {
+	p := &n.Inode
+	r := n.root()
+
+	type tup struct {
+		*unionFSNode
+		name string
+		idx  int
+		st   syscall.Stat_t
+	}
+
+	var parents []tup
+	for p != nil && p != &r.Inode {
+		asUN := p.Operations().(*unionFSNode)
+
+		var st syscall.Stat_t
+		name, idx := asUN.getBranch(&st)
+		if idx == 0 {
+			break
+		}
+		if idx < 0 {
+			log.Println("promote called on nonexistent file")
+			return syscall.EIO
+		}
+
+		parents = append(parents, tup{asUN, name, idx, st})
+		_, p = p.Parent()
+	}
+
+	for i := len(parents) - 1; i >= 0; i-- {
+		t := parents[i]
+
+		path := t.Path(nil)
+		if t.IsDir() {
+			if err := syscall.Mkdir(filepath.Join(r.roots[0], path), t.st.Mode); err != nil {
+				return err.(syscall.Errno)
+			}
+		} else if t.Mode()&syscall.S_IFREG != 0 {
+			if errno := r.promoteRegularFile(path, t.idx, &t.st); errno != 0 {
+				return errno
+			}
+		} else {
+			log.Panicf("don't know how to handle mode %o", t.Mode())
+		}
+		var ts [2]syscall.Timespec
+		ts[0] = t.st.Atim
+		ts[1] = t.st.Mtim
+
+		// ignore error.
+		syscall.UtimesNano(path, ts[:])
+	}
+	return 0
+}
+
+func (r *unionFSRoot) promoteRegularFile(p string, idx int, st *syscall.Stat_t) syscall.Errno {
+	dest, err := syscall.Creat(filepath.Join(r.roots[0], p), st.Mode)
+	if err != nil {
+		return err.(syscall.Errno)
+	}
+	src, err := syscall.Open(filepath.Join(r.roots[idx], p), syscall.O_RDONLY, 0)
+	if err != nil {
+		syscall.Close(dest)
+		return err.(syscall.Errno)
+	}
+
+	var ret syscall.Errno
+	var buf [128 >> 10]byte
+	for {
+		n, err := syscall.Read(src, buf[:])
+		if n == 0 {
+			break
+		}
+		if err != nil {
+			ret = err.(syscall.Errno)
+			break
+		}
+
+		if _, err := syscall.Write(dest, buf[:n]); err != nil {
+			ret = err.(syscall.Errno)
+			break
+		}
+	}
+	syscall.Close(src)
+
+	if err := syscall.Close(dest); err != nil && ret == 0 {
+		ret = err.(syscall.Errno)
+	}
+	return ret
+}

newunionfs/unionfs_test.go

+// Copyright 2019 the Go-FUSE Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package unionfs
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"syscall"
+	"testing"
+
+	"github.com/hanwen/go-fuse/fuse"
+	"github.com/hanwen/go-fuse/internal/testutil"
+	"github.com/hanwen/go-fuse/nodefs"
+	"github.com/hanwen/go-fuse/posixtest"
+)
+
+type testCase struct {
+	dir    string
+	mnt    string
+	server *fuse.Server
+	rw     string
+	ro     string
+	root   *unionFSRoot
+}
+
+func (tc *testCase) Clean() {
+	if tc.server != nil {
+		tc.server.Unmount()
+		tc.server = nil
+	}
+	os.RemoveAll(tc.dir)
+}
+
+func newTestCase(t *testing.T, populate bool) *testCase {
+	t.Helper()
+	dir := testutil.TempDir()
+	dirs := []string{"ro", "rw", "mnt"}
+	if populate {
+		dirs = append(dirs, "ro/dir")
+	}
+
+	for _, d := range dirs {
+		if err := os.Mkdir(filepath.Join(dir, d), 0755); err != nil {
+			t.Fatal("Mkdir", err)
+		}
+	}
+
+	opts := nodefs.Options{}
+	opts.Debug = testutil.VerboseTest()
+	tc := &testCase{
+		dir: dir,
+		mnt: dir + "/mnt",
+		rw:  dir + "/rw",
+		ro:  dir + "/ro",
+	}
+	tc.root = &unionFSRoot{
+		roots: []string{tc.rw, tc.ro},
+	}
+
+	server, err := nodefs.Mount(tc.mnt, tc.root, &opts)
+	if err != nil {
+		t.Fatal("Mount", err)
+	}
+
+	tc.server = server
+
+	if populate {
+		if err := ioutil.WriteFile(tc.ro+"/dir/ro-file", []byte("bla"), 0644); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	return tc
+}
+
+func TestBasic(t *testing.T) {
+	tc := newTestCase(t, true)
+	defer tc.Clean()
+
+	if fi, err := os.Lstat(tc.mnt + "/dir/ro-file"); err != nil {
+		t.Fatal(err)
+	} else if fi.Size() != 3 {
+		t.Errorf("got size %d, want 3", fi.Size())
+	}
+}
+
+func TestDelete(t *testing.T) {
+	tc := newTestCase(t, true)
+	defer tc.Clean()
+
+	if err := os.Remove(tc.mnt + "/dir/ro-file"); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := os.Lstat(tc.ro + "/dir/ro-file"); err != nil {
+		t.Fatal(err)
+	}
+
+	c, err := ioutil.ReadFile(filepath.Join(tc.rw, delDir, filePathHash("dir/ro-file")))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if got, want := string(c), "dir/ro-file"; got != want {
+		t.Errorf("got %q want %q", got, want)
+	}
+}
+
+func TestDeleteMarker(t *testing.T) {
+	tc := newTestCase(t, true)
+	defer tc.Clean()
+
+	path := "dir/ro-file"
+	tc.root.delPath(path)
+
+	var st syscall.Stat_t
+	if err := syscall.Lstat(filepath.Join(tc.mnt, path), &st); err != syscall.ENOENT {
+		t.Fatalf("Lstat before: %v", err)
+	}
+
+	if errno := tc.root.rmMarker(path); errno != 0 {
+		t.Fatalf("rmMarker: %v", errno)
+	}
+
+	if err := syscall.Lstat(filepath.Join(tc.mnt, path), &st); err != nil {
+		t.Fatalf("Lstat after: %v", err)
+	}
+}
+
+func TestCreate(t *testing.T) {
+	tc := newTestCase(t, true)
+	defer tc.Clean()
+
+	path := "dir/ro-file"
+
+	if err := syscall.Unlink(filepath.Join(tc.mnt, path)); err != nil {
+		t.Fatalf("Unlink: %v", err)
+	}
+	want := []byte{42}
+	if err := ioutil.WriteFile(filepath.Join(tc.mnt, path), want, 0644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	if got, err := ioutil.ReadFile(filepath.Join(tc.mnt, path)); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	} else if !bytes.Equal(got, want) {
+		t.Errorf("got %q, want %q", got, want)
+	}
+}
+
+func TestPromote(t *testing.T) {
+	tc := newTestCase(t, true)
+	defer tc.Clean()
+
+	path := "dir/ro-file"
+	mPath := filepath.Join(tc.mnt, path)
+
+	want := []byte{42}
+	if err := ioutil.WriteFile(mPath, want, 0644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	if got, err := ioutil.ReadFile(mPath); err != nil {
+		t.Fatalf("ReadFile: %v", err)
+	} else if !bytes.Equal(got, want) {
+		t.Errorf("got %q, want %q", got, want)
+	}
+}
+
+func TestDeleteRevert(t *testing.T) {
+	tc := newTestCase(t, true)
+	defer tc.Clean()
+
+	path := "dir/ro-file"
+	mPath := filepath.Join(tc.mnt, path)
+	if err := ioutil.WriteFile(mPath, []byte{42}, 0644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	var st syscall.Stat_t
+	if err := syscall.Lstat(mPath, &st); err != nil {
+		t.Fatalf("Lstat before: %v", err)
+	} else if st.Size != 1 {
+		t.Fatalf("Stat: want size 1, got %#v", st)
+	}
+
+	if err := syscall.Unlink(mPath); err != nil {
+		t.Fatalf("Unlink: %v", err)
+	}
+	if err := syscall.Lstat(mPath, &st); err != syscall.ENOENT {
+		t.Fatalf("Lstat after: got %v, want ENOENT", err)
+	}
+}
+
+func TestPosix(t *testing.T) {
+	cases := []string{
+		"SymlinkReadlink",
+		"FileBasic",
+		"TruncateFile",
+		"TruncateNoFile",
+		"FdLeak",
+		//		"MkdirRmdir",
+		//		"NlinkZero",
+		"ParallelFileOpen",
+		//		"Link",
+		//		"ReadDir",
+	}
+
+	for _, nm := range cases {
+		f := posixtest.All[nm]
+		t.Run(nm, func(t *testing.T) {
+			tc := newTestCase(t, false)
+			defer tc.Clean()
+
+			f(t, tc.mnt)
+		})
+	}
+}

nodefs/api.go

@@ -40,7 +40,7 @@
 //
 //  func (n *myNode) Lookup(ctx context.Context, name string,  ... ) (*Inode, syscall.Errno) {
 //    child := myNode{}
-//    return n.NewInode(ctx, &myNode{}, NodeAttr{Mode: syscall.S_IFDIR}), 0
+//    return n.NewInode(ctx, &myNode{}, StableAttr{Mode: syscall.S_IFDIR}), 0
 //  }
 //
 // On mounting, the root InodeEmbedder is associated with root of the
@@ -334,7 +334,7 @@ type Symlinker interface {
 // reference for future reads/writes.
 // Default is to return EROFS.
 type Creater interface {
-	Create(ctx context.Context, name string, flags uint32, mode uint32) (node *Inode, fh FileHandle, fuseFlags uint32, errno syscall.Errno)
+	Create(ctx context.Context, name string, flags uint32, mode uint32, out *fuse.EntryOut) (node *Inode, fh FileHandle, fuseFlags uint32, errno syscall.Errno)
 }
 
 // Unlink should remove a child from this directory.  If the

nodefs/bridge.go

@@ -26,7 +26,9 @@ type fileEntry struct {
 	nodeIndex int
 
 	// Directory
-	dirStream   DirStream
+	dirStream DirStream
+
+	mu          sync.Mutex
 	hasOverflow bool
 	overflow    fuse.DirEntry
 
@@ -49,7 +51,7 @@ type rawBridge struct {
 }
 
 // newInode creates creates new inode pointing to ops.
-func (b *rawBridge) newInodeUnlocked(ops InodeEmbedder, id NodeAttr, persistent bool) *Inode {
+func (b *rawBridge) newInodeUnlocked(ops InodeEmbedder, id StableAttr, persistent bool) *Inode {
 	b.mu.Lock()
 	defer b.mu.Unlock()
 
@@ -82,7 +84,7 @@ func (b *rawBridge) newInodeUnlocked(ops InodeEmbedder, id NodeAttr, persistent
 	//	    file
 	//
 	// dir1.Lookup("file") and dir2.Lookup("file") are executed
-	// simultaneously.  The matching NodeAttrs ensure that we return the
+	// simultaneously.  The matching StableAttrs ensure that we return the
 	// same node.
 	old := b.nodes[id.Ino]
 	if old != nil {
@@ -99,7 +101,7 @@ func (b *rawBridge) newInodeUnlocked(ops InodeEmbedder, id NodeAttr, persistent
 	return ops.embed()
 }
 
-func (b *rawBridge) newInode(ctx context.Context, ops InodeEmbedder, id NodeAttr, persistent bool) *Inode {
+func (b *rawBridge) newInode(ctx context.Context, ops InodeEmbedder, id StableAttr, persistent bool) *Inode {
 	ch := b.newInodeUnlocked(ops, id, persistent)
 	if ch != ops.embed() {
 		return ch
@@ -181,7 +183,7 @@ func NewNodeFS(root InodeEmbedder, opts *Options) fuse.RawFileSystem {
 	}
 
 	initInode(root.embed(), root,
-		NodeAttr{
+		StableAttr{
 			Ino:  1,
 			Mode: fuse.S_IFDIR,
 		},
@@ -293,6 +295,8 @@ func (b *rawBridge) Mkdir(cancel <-chan struct{}, input *fuse.MkdirIn, name stri
 	var errno syscall.Errno
 	if mops, ok := parent.ops.(Mkdirer); ok {
 		child, errno = mops.Mkdir(&fuse.Context{Caller: input.Caller, Cancel: cancel}, name, input.Mode, out)
+	} else {
+		return fuse.ENOTSUP
 	}
 
 	if errno != 0 {
@@ -337,7 +341,7 @@ func (b *rawBridge) Create(cancel <-chan struct{}, input *fuse.CreateIn, name st
 	var f FileHandle
 	var flags uint32
 	if mops, ok := parent.ops.(Creater); ok {
-		child, f, flags, errno = mops.Create(ctx, name, input.Flags, input.Mode)
+		child, f, flags, errno = mops.Create(ctx, name, input.Flags, input.Mode, &out.EntryOut)
 	} else {
 		return fuse.EROFS
 	}
@@ -353,15 +357,8 @@ func (b *rawBridge) Create(cancel <-chan struct{}, input *fuse.CreateIn, name st
 
 	out.OpenFlags = flags
 
-	var temp fuse.AttrOut
-	b.getattr(ctx, child, f, &temp)
-	out.Attr = temp.Attr
-	out.AttrValid = temp.AttrValid
-	out.AttrValidNsec = temp.AttrValidNsec
-
 	child.setEntryOut(&out.EntryOut)
 	b.setEntryOutTimeout(&out.EntryOut)
-
 	return fuse.OK
 }
 
@@ -795,7 +792,7 @@ func (b *rawBridge) getStream(ctx context.Context, inode *Inode) (DirStream, sys
 		for k, ch := range inode.Children() {
 			r = append(r, fuse.DirEntry{Mode: ch.Mode(),
 				Name: k,
-				Ino:  ch.NodeAttr().Ino})
+				Ino:  ch.StableAttr().Ino})
 		}
 		return NewListDirStream(r), 0
 	}
@@ -838,16 +835,20 @@ func (b *rawBridge) ReadDirPlus(cancel <-chan struct{}, input *fuse.ReadIn, out
 	if errno := b.setStream(cancel, input, n, f); errno != 0 {
 		return errnoToStatus(errno)
 	}
+
 	ctx := &fuse.Context{Caller: input.Caller, Cancel: cancel}
 	for f.dirStream.HasNext() {
 		var e fuse.DirEntry
 		var errno syscall.Errno
+
+		f.mu.Lock()
 		if f.hasOverflow {
 			e = f.overflow
 			f.hasOverflow = false
 		} else {
 			e, errno = f.dirStream.Next()
 		}
+		f.mu.Unlock()
 
 		if errno != 0 {
 			return errnoToStatus(errno)
@@ -855,8 +856,10 @@ func (b *rawBridge) ReadDirPlus(cancel <-chan struct{}, input *fuse.ReadIn, out
 
 		entryOut := out.AddDirLookupEntry(e)
 		if entryOut == nil {
+			f.mu.Lock()
 			f.overflow = e
 			f.hasOverflow = true
+			f.mu.Unlock()
 			return fuse.OK
 		}
 

nodefs/cache_test.go

@@ -78,13 +78,13 @@ func (r *keepCacheRoot) OnAdd(ctx context.Context) {
 		keepCache: true,
 	}
 	r.keep.setContent(0)
-	i.AddChild("keep", i.NewInode(ctx, r.keep, NodeAttr{}), true)
+	i.AddChild("keep", i.NewInode(ctx, r.keep, StableAttr{}), true)
 
 	r.nokeep = &keepCacheFile{
 		keepCache: false,
 	}
 	r.nokeep.setContent(0)
-	i.AddChild("nokeep", i.NewInode(ctx, r.nokeep, NodeAttr{}), true)
+	i.AddChild("nokeep", i.NewInode(ctx, r.nokeep, StableAttr{}), true)
 }
 
 // Test FOPEN_KEEP_CACHE. This is a little subtle: the automatic cache
@@ -92,7 +92,7 @@ func (r *keepCacheRoot) OnAdd(ctx context.Context) {
 // change content but no metadata.
 func TestKeepCache(t *testing.T) {
 	root := &keepCacheRoot{}
-	mntDir, clean := testMount(t, root, nil)
+	mntDir, _, clean := testMount(t, root, nil)
 	defer clean()
 	c1, err := ioutil.ReadFile(mntDir + "/keep")
 	if err != nil {

nodefs/directio_test.go

@@ -20,7 +20,7 @@ type dioRoot struct {
 }
 
 func (r *dioRoot) OnAdd(ctx context.Context) {
-	r.Inode.AddChild("file", r.Inode.NewInode(ctx, &dioFile{}, NodeAttr{}), false)
+	r.Inode.AddChild("file", r.Inode.NewInode(ctx, &dioFile{}, StableAttr{}), false)
 }
 
 // A file handle that pretends that every hole/data starts at
@@ -54,7 +54,7 @@ func (f *dioFile) Open(ctx context.Context, flags uint32) (fh FileHandle, fuseFl
 
 func TestDirectIO(t *testing.T) {
 	root := &dioRoot{}
-	mntDir, clean := testMount(t, root, nil)
+	mntDir, server, clean := testMount(t, root, nil)
 	defer clean()
 
 	f, err := os.Open(mntDir + "/file")
@@ -74,6 +74,9 @@ func TestDirectIO(t *testing.T) {
 		t.Errorf("got %q want %q", got, want)
 	}
 
+	if !server.KernelSettings().SupportsVersion(7, 24) {
+		t.Skip("Kernel does not support lseek")
+	}
 	if n, err := syscall.Seek(int(f.Fd()), 512, _SEEK_DATA); err != nil {
 		t.Errorf("Seek: %v", err)
 	} else if n != 1024 {

nodefs/dirstream_linux.go

@@ -5,6 +5,7 @@
 package nodefs
 
 import (
+	"sync"
 	"syscall"
 	"unsafe"
 
@@ -14,7 +15,10 @@ import (
 type loopbackDirStream struct {
 	buf  []byte
 	todo []byte
-	fd   int
+
+	// Protects fd so we can guard against double close
+	mu sync.Mutex
+	fd int
 }
 
 // NewLoopbackDirStream open a directory for reading as a DirStream
@@ -37,14 +41,23 @@ func NewLoopbackDirStream(name string) (DirStream, syscall.Errno) {
 }
 
 func (ds *loopbackDirStream) Close() {
-	syscall.Close(ds.fd)
+	ds.mu.Lock()
+	defer ds.mu.Unlock()
+	if ds.fd != -1 {
+		syscall.Close(ds.fd)
+		ds.fd = -1
+	}
 }
 
 func (ds *loopbackDirStream) HasNext() bool {
+	ds.mu.Lock()
+	defer ds.mu.Unlock()
 	return len(ds.todo) > 0
 }
 
 func (ds *loopbackDirStream) Next() (fuse.DirEntry, syscall.Errno) {
+	ds.mu.Lock()
+	defer ds.mu.Unlock()
 	de := (*syscall.Dirent)(unsafe.Pointer(&ds.todo[0]))
 
 	nameBytes := ds.todo[unsafe.Offsetof(syscall.Dirent{}.Name):de.Reclen]

nodefs/files.go

@@ -6,6 +6,8 @@ package nodefs
 
 import (
 	"context"
+	"sync"
+
 	//	"time"
 
 	"syscall"
@@ -21,6 +23,7 @@ func NewLoopbackFile(fd int) FileHandle {
 }
 
 type loopbackFile struct {
+	mu sync.Mutex
 	fd int
 }
 
@@ -39,21 +42,33 @@ var _ = (FileSetattrer)((*loopbackFile)(nil))
 var _ = (FileAllocater)((*loopbackFile)(nil))
 
 func (f *loopbackFile) Read(ctx context.Context, buf []byte, off int64) (res fuse.ReadResult, errno syscall.Errno) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
 	r := fuse.ReadResultFd(uintptr(f.fd), off, len(buf))
 	return r, OK
 }
 
 func (f *loopbackFile) Write(ctx context.Context, data []byte, off int64) (uint32, syscall.Errno) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
 	n, err := syscall.Pwrite(f.fd, data, off)
 	return uint32(n), ToErrno(err)
 }
 
 func (f *loopbackFile) Release(ctx context.Context) syscall.Errno {
-	err := syscall.Close(f.fd)
-	return ToErrno(err)
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	if f.fd != -1 {
+		err := syscall.Close(f.fd)
+		f.fd = -1
+		return ToErrno(err)
+	}
+	return syscall.EBADF
 }
 
 func (f *loopbackFile) Flush(ctx context.Context) syscall.Errno {
+	f.mu.Lock()
+	defer f.mu.Unlock()
 	// Since Flush() may be called for each dup'd fd, we don't
 	// want to really close the file, we just want to flush. This
 	// is achieved by closing a dup'd fd.
@@ -67,6 +82,8 @@ func (f *loopbackFile) Flush(ctx context.Context) syscall.Errno {
 }
 
 func (f *loopbackFile) Fsync(ctx context.Context, flags uint32) (errno syscall.Errno) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
 	r := ToErrno(syscall.Fsync(f.fd))
 
 	return r
@@ -79,6 +96,8 @@ const (
 )
 
 func (f *loopbackFile) Getlk(ctx context.Context, owner uint64, lk *fuse.FileLock, flags uint32, out *fuse.FileLock) (errno syscall.Errno) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
 	flk := syscall.Flock_t{}
 	lk.ToFlockT(&flk)
 	errno = ToErrno(syscall.FcntlFlock(uintptr(f.fd), _OFD_GETLK, &flk))
@@ -95,6 +114,8 @@ func (f *loopbackFile) Setlkw(ctx context.Context, owner uint64, lk *fuse.FileLo
 }
 
 func (f *loopbackFile) setLock(ctx context.Context, owner uint64, lk *fuse.FileLock, flags uint32, blocking bool) (errno syscall.Errno) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
 	if (flags & fuse.FUSE_LK_FLOCK) != 0 {
 		var op int
 		switch lk.Typ {
@@ -133,6 +154,8 @@ func (f *loopbackFile) Setattr(ctx context.Context, in *fuse.SetAttrIn, out *fus
 }
 
 func (f *loopbackFile) setAttr(ctx context.Context, in *fuse.SetAttrIn) syscall.Errno {
+	f.mu.Lock()
+	defer f.mu.Unlock()
 	var errno syscall.Errno
 	if mode, ok := in.GetMode(); ok {
 		errno = ToErrno(syscall.Fchmod(f.fd, mode))
@@ -187,6 +210,8 @@ func (f *loopbackFile) setAttr(ctx context.Context, in *fuse.SetAttrIn) syscall.
 }
 
 func (f *loopbackFile) Getattr(ctx context.Context, a *fuse.AttrOut) syscall.Errno {
+	f.mu.Lock()
+	defer f.mu.Unlock()
 	st := syscall.Stat_t{}
 	err := syscall.Fstat(f.fd, &st)
 	if err != nil {
@@ -198,6 +223,8 @@ func (f *loopbackFile) Getattr(ctx context.Context, a *fuse.AttrOut) syscall.Err
 }
 
 func (f *loopbackFile) Lseek(ctx context.Context, off uint64, whence uint32) (uint64, syscall.Errno) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
 	n, err := unix.Seek(f.fd, int64(off), int(whence))
 	return uint64(n), ToErrno(err)
 }

nodefs/files_linux.go

@@ -13,6 +13,8 @@ import (
 )
 
 func (f *loopbackFile) Allocate(ctx context.Context, off uint64, sz uint64, mode uint32) syscall.Errno {
+	f.mu.Lock()
+	defer f.mu.Unlock()
 	err := syscall.Fallocate(f.fd, mode, int64(off), int64(sz))
 	if err != nil {
 		return ToErrno(err)

nodefs/inode.go

@@ -22,8 +22,8 @@ type parentData struct {
 	parent *Inode
 }
 
-// NodeAttr holds immutable attributes of a object in the filesystem.
-type NodeAttr struct {
+// StableAttr holds immutable attributes of a object in the filesystem.
+type StableAttr struct {
 	// Each Inode has a type, which does not change over the
 	// lifetime of the inode, for example fuse.S_IFDIR. The default (0)
 	// is interpreted as S_IFREG (regular file).
@@ -43,8 +43,8 @@ type NodeAttr struct {
 	Gen uint64
 }
 
-// Reserved returns if the NodeAttr is using reserved Inode numbers.
-func (i *NodeAttr) Reserved() bool {
+// Reserved returns if the StableAttr is using reserved Inode numbers.
+func (i *StableAttr) Reserved() bool {
 	return i.Ino == 1 || i.Ino == ^uint64(0)
 }
 
@@ -57,7 +57,7 @@ func (i *NodeAttr) Reserved() bool {
 // copied. Inodes should be obtained by calling Inode.NewInode() or
 // Inode.NewPersistentInode().
 type Inode struct {
-	nodeAttr NodeAttr
+	nodeAttr StableAttr
 
 	ops    InodeEmbedder
 	bridge *rawBridge
@@ -96,6 +96,10 @@ type Inode struct {
 	parents  map[parentData]struct{}
 }
 
+func (n *Inode) IsDir() bool {
+	return n.nodeAttr.Mode&syscall.S_IFDIR != 0
+}
+
 func (n *Inode) embed() *Inode {
 	return n
 }
@@ -104,7 +108,7 @@ func (n *Inode) EmbeddedInode() *Inode {
 	return n
 }
 
-func initInode(n *Inode, ops InodeEmbedder, attr NodeAttr, bridge *rawBridge, persistent bool) {
+func initInode(n *Inode, ops InodeEmbedder, attr StableAttr, bridge *rawBridge, persistent bool) {
 	n.ops = ops
 	n.nodeAttr = attr
 	n.bridge = bridge
@@ -122,8 +126,8 @@ func (n *Inode) setEntryOut(out *fuse.EntryOut) {
 	out.Mode = (out.Attr.Mode & 07777) | n.nodeAttr.Mode
 }
 
-// NodeAttr returns the (Ino, Gen) tuple for this node.
-func (n *Inode) NodeAttr() NodeAttr {
+// StableAttr returns the (Ino, Gen) tuple for this node.
+func (n *Inode) StableAttr() StableAttr {
 	return n.nodeAttr
 }
 
@@ -307,7 +311,7 @@ func (iparent *Inode) setEntry(name string, ichild *Inode) {
 
 // NewPersistentInode returns an Inode whose lifetime is not in
 // control of the kernel.
-func (n *Inode) NewPersistentInode(ctx context.Context, node InodeEmbedder, id NodeAttr) *Inode {
+func (n *Inode) NewPersistentInode(ctx context.Context, node InodeEmbedder, id StableAttr) *Inode {
 	return n.newInode(ctx, node, id, true)
 }
 
@@ -323,11 +327,11 @@ func (n *Inode) ForgetPersistent() {
 // id.Ino argument is used to implement hard-links.  If it is given,
 // and another node with the same ID is known, that will node will be
 // returned, and the passed-in `node` is ignored.
-func (n *Inode) NewInode(ctx context.Context, node InodeEmbedder, id NodeAttr) *Inode {
+func (n *Inode) NewInode(ctx context.Context, node InodeEmbedder, id StableAttr) *Inode {
 	return n.newInode(ctx, node, id, false)
 }
 
-func (n *Inode) newInode(ctx context.Context, ops InodeEmbedder, id NodeAttr, persistent bool) *Inode {
+func (n *Inode) newInode(ctx context.Context, ops InodeEmbedder, id StableAttr, persistent bool) *Inode {
 	return n.bridge.newInode(ctx, ops, id, persistent)
 }
 

nodefs/interrupt_test.go

@@ -25,7 +25,7 @@ func (r *interruptRoot) Lookup(ctx context.Context, name string, out *fuse.Entry
 	if name != "file" {
 		return nil, syscall.ENOENT
 	}
-	ch := r.Inode.NewInode(ctx, &r.child, NodeAttr{
+	ch := r.Inode.NewInode(ctx, &r.child, StableAttr{
 		Ino: 2,
 		Gen: 1})
 
@@ -55,7 +55,7 @@ func TestInterrupt(t *testing.T) {
 	root := &interruptRoot{}
 
 	oneSec := time.Second
-	mntDir, clean := testMount(t, root, &Options{
+	mntDir, _, clean := testMount(t, root, &Options{
 		EntryTimeout: &oneSec,
 		AttrTimeout:  &oneSec,
 	})

nodefs/loopback.go

@@ -41,7 +41,6 @@ var _ = (Mkdirer)((*loopbackNode)(nil))
 var _ = (Mknoder)((*loopbackNode)(nil))
 var _ = (Linker)((*loopbackNode)(nil))
 var _ = (Symlinker)((*loopbackNode)(nil))
-var _ = (Creater)((*loopbackNode)(nil))
 var _ = (Unlinker)((*loopbackNode)(nil))
 var _ = (Rmdirer)((*loopbackNode)(nil))
 var _ = (Renamer)((*loopbackNode)(nil))
@@ -163,7 +162,7 @@ func (n *loopbackNode) Rename(ctx context.Context, name string, newParent InodeE
 	return ToErrno(err)
 }
 
-func (r *loopbackRoot) idFromStat(st *syscall.Stat_t) NodeAttr {
+func (r *loopbackRoot) idFromStat(st *syscall.Stat_t) StableAttr {
 	// We compose an inode number by the underlying inode, and
 	// mixing in the device number. In traditional filesystems,
 	// the inode numbers are small. The device numbers are also
@@ -173,7 +172,7 @@ func (r *loopbackRoot) idFromStat(st *syscall.Stat_t) NodeAttr {
 	// the underlying filesystem
 	swapped := (uint64(st.Dev) << 32) | (uint64(st.Dev) >> 32)
 	swappedRootDev := (r.rootDev << 32) | (r.rootDev >> 32)
-	return NodeAttr{
+	return StableAttr{
 		Mode: uint32(st.Mode),
 		Gen:  1,
 		// This should work well for traditional backing FSes,
@@ -182,7 +181,9 @@ func (r *loopbackRoot) idFromStat(st *syscall.Stat_t) NodeAttr {
 	}
 }
 
-func (n *loopbackNode) Create(ctx context.Context, name string, flags uint32, mode uint32) (inode *Inode, fh FileHandle, fuseFlags uint32, errno syscall.Errno) {
+var _ = (Creater)((*loopbackNode)(nil))
+
+func (n *loopbackNode) Create(ctx context.Context, name string, flags uint32, mode uint32, out *fuse.EntryOut) (inode *Inode, fh FileHandle, fuseFlags uint32, errno syscall.Errno) {
 	p := filepath.Join(n.path(), name)
 
 	fd, err := syscall.Open(p, int(flags)|os.O_CREATE, mode)
@@ -199,6 +200,8 @@ func (n *loopbackNode) Create(ctx context.Context, name string, flags uint32, mo
 	node := &loopbackNode{}
 	ch := n.NewInode(ctx, node, n.root().idFromStat(&st))
 	lf := NewLoopbackFile(fd)
+
+	out.FromStat(&st)
 	return ch, lf, 0, 0
 }
 
@@ -295,6 +298,79 @@ func (n *loopbackNode) Getattr(ctx context.Context, f FileHandle, out *fuse.Attr
 	return OK
 }
 
+var _ = (Setattrer)((*loopbackNode)(nil))
+
+func (n *loopbackNode) Setattr(ctx context.Context, f FileHandle, in *fuse.SetAttrIn, out *fuse.AttrOut) syscall.Errno {
+	p := n.path()
+	fsa, ok := f.(FileSetattrer)
+	if ok && fsa != nil {
+		fsa.Setattr(ctx, in, out)
+	} else {
+		if m, ok := in.GetMode(); ok {
+			if err := syscall.Chmod(p, m); err != nil {
+				return ToErrno(err)
+			}
+		}
+
+		uid, uok := in.GetUID()
+		gid, gok := in.GetGID()
+		if uok || gok {
+			suid := -1
+			sgid := -1
+			if uok {
+				suid = int(uid)
+			}
+			if gok {
+				sgid = int(gid)
+			}
+			if err := syscall.Chown(p, suid, sgid); err != nil {
+				return ToErrno(err)
+			}
+		}
+
+		mtime, mok := in.GetMTime()
+		atime, aok := in.GetATime()
+
+		if mok || aok {
+
+			ap := &atime
+			mp := &mtime
+			if !aok {
+				ap = nil
+			}
+			if !mok {
+				mp = nil
+			}
+			var ts [2]syscall.Timespec
+			ts[0] = fuse.UtimeToTimespec(ap)
+			ts[1] = fuse.UtimeToTimespec(mp)
+
+			if err := syscall.UtimesNano(p, ts[:]); err != nil {
+				return ToErrno(err)
+			}
+		}
+
+		if sz, ok := in.GetSize(); ok {
+			if err := syscall.Truncate(p, int64(sz)); err != nil {
+				return ToErrno(err)
+			}
+		}
+	}
+
+	fga, ok := f.(FileGetattrer)
+	if ok && fga != nil {
+		fga.Getattr(ctx, out)
+	} else {
+		st := syscall.Stat_t{}
+		err := syscall.Lstat(p, &st)
+		if err != nil {
+			return ToErrno(err)
+		}
+		out.FromStat(&st)
+	}
+	return OK
+}
+
 // NewLoopback returns a root node for a loopback file system whose
 // root is at the given root.
 func NewLoopbackRoot(root string) (InodeEmbedder, error) {

nodefs/loopback_linux.go

@@ -52,7 +52,7 @@ func (n *loopbackNode) renameExchange(name string, newparent *loopbackNode, newN
 
 	// Double check that nodes didn't change from under us.
 	inode := &n.Inode
-	if inode.Root() != inode && inode.NodeAttr().Ino != n.root().idFromStat(&st).Ino {
+	if inode.Root() != inode && inode.StableAttr().Ino != n.root().idFromStat(&st).Ino {
 		return syscall.EBUSY
 	}
 	if err := syscall.Fstat(fd2, &st); err != nil {
@@ -60,7 +60,7 @@ func (n *loopbackNode) renameExchange(name string, newparent *loopbackNode, newN
 	}
 
 	newinode := &newparent.Inode
-	if newinode.Root() != newinode && newinode.NodeAttr().Ino != n.root().idFromStat(&st).Ino {
+	if newinode.Root() != newinode && newinode.StableAttr().Ino != n.root().idFromStat(&st).Ino {
 		return syscall.EBUSY
 	}
 

nodefs/loopback_linux_test.go

@@ -140,6 +140,10 @@ func TestCopyFileRange(t *testing.T) {
 	tc := newTestCase(t, true, true)
 	defer tc.Clean()
 
+	if !tc.server.KernelSettings().SupportsVersion(7, 28) {
+		t.Skip("need v7.28 for CopyFileRange")
+	}
+
 	tc.writeOrig("src", "01234567890123456789", 0644)
 	tc.writeOrig("dst", "abcdefghijabcdefghij", 0644)
 

nodefs/mem.go

@@ -13,6 +13,7 @@ import (
 
 // MemRegularFile is a filesystem node that holds a read-only data
 // slice in memory.
+
 type MemRegularFile struct {
 	Inode
 	Data []byte
@@ -20,7 +21,6 @@ type MemRegularFile struct {
 }
 
 var _ = (Opener)((*MemRegularFile)(nil))
-var _ = (Getattrer)((*MemRegularFile)(nil))
 var _ = (Reader)((*MemRegularFile)(nil))
 var _ = (Flusher)((*MemRegularFile)(nil))
 
@@ -32,6 +32,8 @@ func (f *MemRegularFile) Open(ctx context.Context, flags uint32) (fh FileHandle,
 	return nil, fuse.FOPEN_KEEP_CACHE, OK
 }
 
+var _ = (Getattrer)((*MemRegularFile)(nil))
+
 func (f *MemRegularFile) Getattr(ctx context.Context, fh FileHandle, out *fuse.AttrOut) syscall.Errno {
 	out.Attr = f.Attr
 	out.Attr.Size = uint64(len(f.Data))
@@ -53,6 +55,7 @@ func (f *MemRegularFile) Read(ctx context.Context, fh FileHandle, dest []byte, o
 // MemSymlink is an inode holding a symlink in memory.
 type MemSymlink struct {
 	Inode
+	Attr fuse.Attr
 	Data []byte
 }
 
@@ -61,3 +64,10 @@ var _ = (Readlinker)((*MemSymlink)(nil))
 func (l *MemSymlink) Readlink(ctx context.Context) ([]byte, syscall.Errno) {
 	return l.Data, OK
 }
+
+var _ = (Getattrer)((*MemSymlink)(nil))
+
+func (l *MemSymlink) Getattr(ctx context.Context, fh FileHandle, out *fuse.AttrOut) syscall.Errno {
+	out.Attr = l.Attr
+	return OK
+}

nodefs/mem_test.go

@@ -17,7 +17,7 @@ import (
 	"github.com/hanwen/go-fuse/internal/testutil"
 )
 
-func testMount(t *testing.T, root InodeEmbedder, opts *Options) (string, func()) {
+func testMount(t *testing.T, root InodeEmbedder, opts *Options) (string, *fuse.Server, func()) {
 	t.Helper()
 
 	mntDir := testutil.TempDir()
@@ -32,7 +32,7 @@ func testMount(t *testing.T, root InodeEmbedder, opts *Options) (string, func())
 	if err != nil {
 		t.Fatal(err)
 	}
-	return mntDir, func() {
+	return mntDir, server, func() {
 		server.Unmount()
 		os.Remove(mntDir)
 	}
@@ -41,7 +41,7 @@ func testMount(t *testing.T, root InodeEmbedder, opts *Options) (string, func())
 func TestDataFile(t *testing.T) {
 	want := "hello"
 	root := &Inode{}
-	mntDir, clean := testMount(t, root, &Options{
+	mntDir, _, clean := testMount(t, root, &Options{
 		FirstAutomaticIno: 1,
 		OnAdd: func(ctx context.Context) {
 			n := root.EmbeddedInode()
@@ -53,7 +53,7 @@ func TestDataFile(t *testing.T) {
 						Mode: 0464,
 					},
 				},
-				NodeAttr{})
+				StableAttr{})
 			n.AddChild("file", ch, false)
 		},
 	})
@@ -94,7 +94,7 @@ func TestDataFileLargeRead(t *testing.T) {
 
 	data := make([]byte, 256*1024)
 	rand.Read(data[:])
-	mntDir, clean := testMount(t, root, &Options{
+	mntDir, _, clean := testMount(t, root, &Options{
 		FirstAutomaticIno: 1,
 		OnAdd: func(ctx context.Context) {
 			n := root.EmbeddedInode()
@@ -106,7 +106,7 @@ func TestDataFileLargeRead(t *testing.T) {
 						Mode: 0464,
 					},
 				},
-				NodeAttr{})
+				StableAttr{})
 			n.AddChild("file", ch, false)
 		},
 	})
@@ -130,14 +130,14 @@ func (s *SymlinkerRoot) Symlink(ctx context.Context, target, name string, out *f
 		Data: []byte(target),
 	}
 
-	ch := s.NewPersistentInode(ctx, l, NodeAttr{Mode: syscall.S_IFLNK})
+	ch := s.NewPersistentInode(ctx, l, StableAttr{Mode: syscall.S_IFLNK})
 	return ch, 0
 }
 
 func TestDataSymlink(t *testing.T) {
 	root := &SymlinkerRoot{}
 
-	mntDir, clean := testMount(t, root, nil)
+	mntDir, _, clean := testMount(t, root, nil)
 	defer clean()
 
 	if err := syscall.Symlink("target", mntDir+"/link"); err != nil {

nodefs/readonly_test.go

@@ -16,7 +16,7 @@ import (
 func TestReadonlyCreate(t *testing.T) {
 	root := &Inode{}
 
-	mntDir, clean := testMount(t, root, nil)
+	mntDir, _, clean := testMount(t, root, nil)
 	defer clean()
 
 	_, err := syscall.Creat(mntDir+"/test", 0644)
@@ -28,11 +28,11 @@ func TestReadonlyCreate(t *testing.T) {
 func TestDefaultPermissions(t *testing.T) {
 	root := &Inode{}
 
-	mntDir, clean := testMount(t, root, &Options{
+	mntDir, _, clean := testMount(t, root, &Options{
 		DefaultPermissions: true,
 		OnAdd: func(ctx context.Context) {
-			dir := root.NewPersistentInode(ctx, &Inode{}, NodeAttr{Mode: syscall.S_IFDIR})
-			file := root.NewPersistentInode(ctx, &Inode{}, NodeAttr{Mode: syscall.S_IFREG})
+			dir := root.NewPersistentInode(ctx, &Inode{}, StableAttr{Mode: syscall.S_IFDIR})
+			file := root.NewPersistentInode(ctx, &Inode{}, StableAttr{Mode: syscall.S_IFREG})
 
 			root.AddChild("dir", dir, false)
 			root.AddChild("file", file, false)

nodefs/simple_test.go

@@ -5,13 +5,11 @@
 package nodefs
 
 import (
-	"bytes"
 	"fmt"
 	"io/ioutil"
 	"os"
 	"path/filepath"
 	"reflect"
-	"runtime"
 	"sync"
 	"syscall"
 	"testing"
@@ -19,6 +17,7 @@ import (
 
 	"github.com/hanwen/go-fuse/fuse"
 	"github.com/hanwen/go-fuse/internal/testutil"
+	"github.com/hanwen/go-fuse/posixtest"
 )
 
 type testCase struct {
@@ -132,72 +131,14 @@ func TestFileBasic(t *testing.T) {
 	tc := newTestCase(t, true, true)
 	defer tc.Clean()
 
-	content := []byte("hello world")
-	fn := tc.mntDir + "/file"
-
-	if err := ioutil.WriteFile(fn, content, 0755); err != nil {
-		t.Fatalf("WriteFile: %v", err)
-	}
-
-	if got, err := ioutil.ReadFile(fn); err != nil {
-		t.Fatalf("ReadFile: %v", err)
-	} else if bytes.Compare(got, content) != 0 {
-		t.Errorf("ReadFile: got %q, want %q", got, content)
-	}
-
-	f, err := os.Open(fn)
-	if err != nil {
-		t.Fatalf("Open: %v", err)
-	}
-
-	defer f.Close()
-
-	fi, err := f.Stat()
-
-	if err != nil {
-		t.Fatalf("Fstat: %v", err)
-	} else if int(fi.Size()) != len(content) {
-		t.Errorf("got size %d want 5", fi.Size())
-	}
-
-	stat := fuse.ToStatT(fi)
-	if got, want := uint32(stat.Mode), uint32(fuse.S_IFREG|0755); got != want {
-		t.Errorf("Fstat: got mode %o, want %o", got, want)
-	}
-
-	if err := f.Close(); err != nil {
-		t.Errorf("Close: %v", err)
-	}
+	posixtest.FileBasic(t, tc.mntDir)
 }
 
 func TestFileTruncate(t *testing.T) {
 	tc := newTestCase(t, true, true)
 	defer tc.Clean()
 
-	content := []byte("hello world")
-
-	tc.writeOrig("file", string(content), 0755)
-
-	f, err := os.OpenFile(tc.mntDir+"/file", os.O_RDWR, 0644)
-	if err != nil {
-		t.Fatalf("Open: %v", err)
-	}
-	defer f.Close()
-
-	const trunc = 5
-	if err := f.Truncate(5); err != nil {
-		t.Errorf("Truncate: %v", err)
-	}
-
-	if err := f.Close(); err != nil {
-		t.Errorf("Close: %v", err)
-	}
-
-	if got, err := ioutil.ReadFile(tc.origDir + "/file"); err != nil {
-		t.Fatalf("ReadFile: %v", err)
-	} else if want := content[:trunc]; bytes.Compare(got, want) != 0 {
-		t.Errorf("got %q, want %q", got, want)
-	}
+	posixtest.TruncateFile(t, tc.mntDir)
 }
 
 func TestFileFdLeak(t *testing.T) {
@@ -208,24 +149,7 @@ func TestFileFdLeak(t *testing.T) {
 		}
 	}()
 
-	tc.writeOrig("file", "hello world", 0755)
-
-	for i := 0; i < 100; i++ {
-		if _, err := ioutil.ReadFile(tc.mntDir + "/file"); err != nil {
-			t.Fatalf("ReadFile: %v", err)
-		}
-	}
-
-	if runtime.GOOS == "linux" {
-		infos, err := ioutil.ReadDir("/proc/self/fd")
-		if err != nil {
-			t.Errorf("ReadDir %v", err)
-		}
-
-		if len(infos) > 15 {
-			t.Errorf("found %d open file descriptors for 100x ReadFile", len(infos))
-		}
-	}
+	posixtest.FdLeak(t, tc.mntDir)
 
 	tc.Clean()
 	bridge := tc.rawFS.(*rawBridge)
@@ -240,54 +164,13 @@ func TestMkdir(t *testing.T) {
 	tc := newTestCase(t, true, true)
 	defer tc.Clean()
 
-	if err := os.Mkdir(tc.mntDir+"/dir", 0755); err != nil {
-		t.Fatalf("Mkdir: %v", err)
-	}
-
-	if fi, err := os.Lstat(tc.mntDir + "/dir"); err != nil {
-		t.Fatalf("Lstat %v", err)
-	} else if !fi.IsDir() {
-		t.Fatalf("is not a directory")
-	}
-
-	if err := os.Remove(tc.mntDir + "/dir"); err != nil {
-		t.Fatalf("Remove: %v", err)
-	}
+	posixtest.MkdirRmdir(t, tc.mntDir)
 }
 
 func testRenameOverwrite(t *testing.T, destExists bool) {
 	tc := newTestCase(t, true, true)
 	defer tc.Clean()
-
-	if err := os.Mkdir(tc.origDir+"/dir", 0755); err != nil {
-		t.Fatalf("Mkdir: %v", err)
-	}
-	tc.writeOrig("file", "hello", 0644)
-
-	if destExists {
-		tc.writeOrig("/dir/renamed", "xx", 0644)
-	}
-
-	st := syscall.Stat_t{}
-	if err := syscall.Lstat(tc.mntDir+"/file", &st); err != nil {
-		t.Fatalf("Lstat before: %v", err)
-	}
-	beforeIno := st.Ino
-	if err := os.Rename(tc.mntDir+"/file", tc.mntDir+"/dir/renamed"); err != nil {
-		t.Errorf("Rename: %v", err)
-	}
-
-	if fi, err := os.Lstat(tc.mntDir + "/file"); err == nil {
-		t.Fatalf("Lstat old: %v", fi)
-	}
-
-	if err := syscall.Lstat(tc.mntDir+"/dir/renamed", &st); err != nil {
-		t.Fatalf("Lstat after: %v", err)
-	}
-
-	if got := st.Ino; got != beforeIno {
-		t.Errorf("got ino %d, want %d", got, beforeIno)
-	}
+	posixtest.RenameOverwrite(t, tc.mntDir, destExists)
 }
 
 func TestRenameDestExist(t *testing.T) {
@@ -303,114 +186,28 @@ func TestNlinkZero(t *testing.T) {
 	tc := newTestCase(t, true, true)
 	defer tc.Clean()
 
-	src := tc.mntDir + "/src"
-	dst := tc.mntDir + "/dst"
-	if err := ioutil.WriteFile(src, []byte("source"), 0644); err != nil {
-		t.Fatalf("WriteFile: %v", err)
-	}
-
-	if err := ioutil.WriteFile(dst, []byte("dst"), 0644); err != nil {
-		t.Fatalf("WriteFile: %v", err)
-	}
-
-	f, err := syscall.Open(dst, 0, 0)
-	if err != nil {
-		t.Fatalf("Open: %v", err)
-	}
-	defer syscall.Close(f)
-
-	var st syscall.Stat_t
-	if err := syscall.Fstat(f, &st); err != nil {
-		t.Errorf("Fstat before: %v", err)
-	} else if st.Nlink != 1 {
-		t.Errorf("Nlink of file: got %d, want 1", st.Nlink)
-	}
-
-	if err := os.Rename(src, dst); err != nil {
-		t.Fatalf("Rename: %v", err)
-	}
-
-	if err := syscall.Fstat(f, &st); err != nil {
-		t.Errorf("Fstat after: %v", err)
-	} else if st.Nlink != 0 {
-		t.Errorf("Nlink of overwritten file: got %d, want 0", st.Nlink)
-	}
+	posixtest.NlinkZero(t, tc.mntDir)
 }
 
 func TestParallelFileOpen(t *testing.T) {
 	tc := newTestCase(t, true, true)
 	defer tc.Clean()
 
-	fn := tc.mntDir + "/file"
-	if err := ioutil.WriteFile(fn, []byte("content"), 0644); err != nil {
-		t.Fatalf("WriteFile: %v", err)
-	}
-
-	var wg sync.WaitGroup
-	one := func(b byte) {
-		f, err := os.OpenFile(fn, os.O_RDWR, 0644)
-		if err != nil {
-			t.Fatalf("OpenFile: %v", err)
-		}
-		var buf [10]byte
-		f.Read(buf[:])
-		buf[0] = b
-		f.WriteAt(buf[0:1], 2)
-		f.Close()
-		wg.Done()
-	}
-	for i := 0; i < 10; i++ {
-		wg.Add(1)
-		go one(byte(i))
-	}
-	wg.Wait()
+	posixtest.ParallelFileOpen(t, tc.mntDir)
 }
 
 func TestSymlink(t *testing.T) {
 	tc := newTestCase(t, true, true)
 	defer tc.Clean()
 
-	fn := tc.mntDir + "/link"
-	target := "target"
-	if err := os.Symlink(target, fn); err != nil {
-		t.Fatalf("Symlink: %v", err)
-	}
-
-	if got, err := os.Readlink(fn); err != nil {
-		t.Fatalf("Readlink: %v", err)
-	} else if got != target {
-		t.Errorf("Readlink: got %q, want %q", got, target)
-	}
+	posixtest.SymlinkReadlink(t, tc.mntDir)
 }
 
 func TestLink(t *testing.T) {
 	tc := newTestCase(t, true, true)
 	defer tc.Clean()
 
-	link := tc.mntDir + "/link"
-	target := tc.mntDir + "/target"
-
-	if err := ioutil.WriteFile(target, []byte("hello"), 0644); err != nil {
-		t.Fatalf("WriteFile: %v", err)
-	}
-
-	st := syscall.Stat_t{}
-	if err := syscall.Lstat(target, &st); err != nil {
-		t.Fatalf("Lstat before: %v", err)
-	}
-
-	beforeIno := st.Ino
-	if err := os.Link(target, link); err != nil {
-		t.Errorf("Link: %v", err)
-	}
-
-	if err := syscall.Lstat(link, &st); err != nil {
-		t.Fatalf("Lstat after: %v", err)
-	}
-
-	if st.Ino != beforeIno {
-		t.Errorf("Lstat after: got %d, want %d", st.Ino, beforeIno)
-	}
+	posixtest.Link(t, tc.mntDir)
 }
 
 func TestNotifyEntry(t *testing.T) {
@@ -450,38 +247,40 @@ func TestReadDir(t *testing.T) {
 	tc := newTestCase(t, true, true)
 	defer tc.Clean()
 
-	f, err := os.Open(tc.mntDir)
-	if err != nil {
-		t.Fatalf("Open: %v", err)
-	}
-	defer f.Close()
-
-	// add entries after opening the directory
-	want := map[string]bool{}
-	for i := 0; i < 110; i++ {
-		// 40 bytes of filename, so 110 entries overflows a
-		// 4096 page.
-		nm := fmt.Sprintf("file%036x", i)
-		want[nm] = true
-		tc.writeOrig(nm, "hello", 0644)
-	}
+	posixtest.ReadDir(t, tc.mntDir)
+}
 
-	names, err := f.Readdirnames(-1)
-	if err != nil {
-		t.Fatalf("ReadDir: %v", err)
-	}
-	got := map[string]bool{}
-	for _, e := range names {
-		got[e] = true
-	}
-	if len(got) != len(want) {
-		t.Errorf("got %d entries, want %d", len(got), len(want))
-	}
-	for k := range got {
-		if !want[k] {
-			t.Errorf("got unknown name %q", k)
+func TestReadDirStress(t *testing.T) {
+	tc := newTestCase(t, true, true)
+	defer tc.Clean()
+	// (ab)use posixtest.ReadDir to create 110 test files
+	posixtest.ReadDir(t, tc.mntDir)
+
+	var wg sync.WaitGroup
+	stress := func(gr int) {
+		defer wg.Done()
+		for i := 1; i < 100; i++ {
+			f, err := os.Open(tc.mntDir)
+			if err != nil {
+				t.Error(err)
+				return
+			}
+			_, err = f.Readdirnames(-1)
+			if err != nil {
+				t.Errorf("goroutine %d iteration %d: %v", gr, i, err)
+				f.Close()
+				return
+			}
+			f.Close()
 		}
 	}
+
+	n := 3
+	for i := 1; i <= n; i++ {
+		wg.Add(1)
+		go stress(i)
+	}
+	wg.Wait()
 }
 
 // This test is racy. If an external process consumes space while this
@@ -589,3 +388,10 @@ func TestMknod(t *testing.T) {
 		})
 	}
 }
+
+func TestTruncate(t *testing.T) {
+	tc := newTestCase(t, false, false)
+	defer tc.Clean()
+
+	posixtest.TruncateNoFile(t, tc.mntDir)
+}

nodefs/zip_test.go

@@ -62,7 +62,7 @@ func TestZipFS(t *testing.T) {
 	}
 
 	root := &zipRoot{zr: r}
-	mntDir, clean := testMount(t, root, nil)
+	mntDir, _, clean := testMount(t, root, nil)
 	defer clean()
 
 	for k, v := range testData {
@@ -104,10 +104,10 @@ func TestZipFSOnAdd(t *testing.T) {
 	zr := &zipRoot{zr: r}
 
 	root := &Inode{}
-	mnt, clean := testMount(t, root, &Options{
+	mnt, _, clean := testMount(t, root, &Options{
 		OnAdd: func(ctx context.Context) {
 			root.AddChild("sub",
-				root.NewPersistentInode(ctx, zr, NodeAttr{Mode: syscall.S_IFDIR}), false)
+				root.NewPersistentInode(ctx, zr, StableAttr{Mode: syscall.S_IFDIR}), false)
 		},
 	})
 	defer clean()
@@ -197,13 +197,13 @@ func (zr *zipRoot) OnAdd(ctx context.Context) {
 			ch := p.GetChild(component)
 			if ch == nil {
 				ch = p.NewPersistentInode(ctx, &Inode{},
-					NodeAttr{Mode: fuse.S_IFDIR})
+					StableAttr{Mode: fuse.S_IFDIR})
 				p.AddChild(component, ch, true)
 			}
 
 			p = ch
 		}
-		ch := p.NewPersistentInode(ctx, &zipFile{file: f}, NodeAttr{})
+		ch := p.NewPersistentInode(ctx, &zipFile{file: f}, StableAttr{})
 		p.AddChild(base, ch, true)
 	}
 }
@@ -235,7 +235,7 @@ func ExampleInode_NewPersistentInode() {
 				if ch == nil {
 					// Create a directory
 					ch = p.NewPersistentInode(ctx, &Inode{},
-						NodeAttr{Mode: syscall.S_IFDIR})
+						StableAttr{Mode: syscall.S_IFDIR})
 					// Add it
 					p.AddChild(component, ch, true)
 				}
@@ -246,7 +246,7 @@ func ExampleInode_NewPersistentInode() {
 			// Create the file
 			child := p.NewPersistentInode(ctx, &MemRegularFile{
 				Data: []byte(content),
-			}, NodeAttr{})
+			}, StableAttr{})
 
 			// And add it
 			p.AddChild(base, child, true)

posixtest/test.go

+// Copyright 2019 the Go-FUSE Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package posixtest file systems for generic posix conformance.
+package posixtest
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"runtime"
+	"sync"
+	"syscall"
+	"testing"
+
+	"github.com/hanwen/go-fuse/fuse"
+)
+
+var All = map[string]func(*testing.T, string){
+	"SymlinkReadlink":            SymlinkReadlink,
+	"FileBasic":                  FileBasic,
+	"TruncateFile":               TruncateFile,
+	"TruncateNoFile":             TruncateNoFile,
+	"FdLeak":                     FdLeak,
+	"MkdirRmdir":                 MkdirRmdir,
+	"NlinkZero":                  NlinkZero,
+	"ParallelFileOpen":           ParallelFileOpen,
+	"Link":                       Link,
+	"RenameOverwriteDestNoExist": RenameOverwriteDestNoExist,
+	"RenameOverwriteDestExist":   RenameOverwriteDestExist,
+	"ReadDir":                    ReadDir,
+}
+
+// SymlinkReadlink tests basic symlink functionality
+func SymlinkReadlink(t *testing.T, mnt string) {
+	err := os.Symlink("/foobar", mnt+"/link")
+	if err != nil {
+		t.Fatalf("Symlink: %v", err)
+	}
+
+	val, err := os.Readlink(mnt + "/link")
+	if err != nil {
+		t.Fatalf("Readlink: %v", err)
+	}
+
+	if val != "/foobar" {
+		t.Errorf("symlink mismatch: %v", val)
+	}
+}
+
+func FileBasic(t *testing.T, mnt string) {
+	content := []byte("hello world")
+	fn := mnt + "/file"
+
+	if err := ioutil.WriteFile(fn, content, 0755); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	if got, err := ioutil.ReadFile(fn); err != nil {
+		t.Fatalf("ReadFile: %v", err)
+	} else if bytes.Compare(got, content) != 0 {
+		t.Errorf("ReadFile: got %q, want %q", got, content)
+	}
+
+	f, err := os.Open(fn)
+	if err != nil {
+		t.Fatalf("Open: %v", err)
+	}
+
+	defer f.Close()
+
+	fi, err := f.Stat()
+	if err != nil {
+		t.Fatalf("Fstat: %v", err)
+	} else if int(fi.Size()) != len(content) {
+		t.Errorf("got size %d want 5", fi.Size())
+	}
+
+	stat := fuse.ToStatT(fi)
+	if got, want := uint32(stat.Mode), uint32(fuse.S_IFREG|0755); got != want {
+		t.Errorf("Fstat: got mode %o, want %o", got, want)
+	}
+
+	if err := f.Close(); err != nil {
+		t.Errorf("Close: %v", err)
+	}
+}
+
+func TruncateFile(t *testing.T, mnt string) {
+	content := []byte("hello world")
+	fn := mnt + "/file"
+	if err := ioutil.WriteFile(fn, content, 0755); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	f, err := os.OpenFile(fn, os.O_RDWR, 0644)
+	if err != nil {
+		t.Fatalf("Open: %v", err)
+	}
+	defer f.Close()
+
+	const trunc = 5
+	if err := f.Truncate(5); err != nil {
+		t.Errorf("Truncate: %v", err)
+	}
+
+	if err := f.Close(); err != nil {
+		t.Errorf("Close: %v", err)
+	}
+
+	if got, err := ioutil.ReadFile(fn); err != nil {
+		t.Fatalf("ReadFile: %v", err)
+	} else if want := content[:trunc]; bytes.Compare(got, want) != 0 {
+		t.Errorf("got %q, want %q", got, want)
+	}
+}
+func TruncateNoFile(t *testing.T, mnt string) {
+	fn := mnt + "/file"
+	if err := ioutil.WriteFile(fn, []byte("hello"), 0644); err != nil {
+		t.Errorf("WriteFile: %v", err)
+	}
+
+	if err := syscall.Truncate(fn, 1); err != nil {
+		t.Fatalf("Truncate: %v", err)
+	}
+	var st syscall.Stat_t
+	if err := syscall.Lstat(fn, &st); err != nil {
+		t.Fatalf("Lstat: %v", err)
+	}
+	if st.Size != 1 {
+		t.Errorf("got size %d, want 1", st.Size)
+	}
+}
+
+func FdLeak(t *testing.T, mnt string) {
+	fn := mnt + "/file"
+
+	if err := ioutil.WriteFile(fn, []byte("hello world"), 0755); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	for i := 0; i < 100; i++ {
+		if _, err := ioutil.ReadFile(fn); err != nil {
+			t.Fatalf("ReadFile: %v", err)
+		}
+	}
+
+	if runtime.GOOS == "linux" {
+		infos, err := ioutil.ReadDir("/proc/self/fd")
+		if err != nil {
+			t.Errorf("ReadDir %v", err)
+		}
+
+		if len(infos) > 15 {
+			t.Errorf("found %d open file descriptors for 100x ReadFile", len(infos))
+		}
+	}
+}
+
+func MkdirRmdir(t *testing.T, mnt string) {
+	fn := mnt + "/dir"
+
+	if err := os.Mkdir(fn, 0755); err != nil {
+		t.Fatalf("Mkdir: %v", err)
+	}
+
+	if fi, err := os.Lstat(fn); err != nil {
+		t.Fatalf("Lstat %v", err)
+	} else if !fi.IsDir() {
+		t.Fatalf("is not a directory")
+	}
+
+	if err := os.Remove(fn); err != nil {
+		t.Fatalf("Remove: %v", err)
+	}
+}
+
+func NlinkZero(t *testing.T, mnt string) {
+	src := mnt + "/src"
+	dst := mnt + "/dst"
+	if err := ioutil.WriteFile(src, []byte("source"), 0644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	if err := ioutil.WriteFile(dst, []byte("dst"), 0644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	f, err := syscall.Open(dst, 0, 0)
+	if err != nil {
+		t.Fatalf("Open: %v", err)
+	}
+	defer syscall.Close(f)
+
+	var st syscall.Stat_t
+	if err := syscall.Fstat(f, &st); err != nil {
+		t.Errorf("Fstat before: %v", err)
+	} else if st.Nlink != 1 {
+		t.Errorf("Nlink of file: got %d, want 1", st.Nlink)
+	}
+
+	if err := os.Rename(src, dst); err != nil {
+		t.Fatalf("Rename: %v", err)
+	}
+
+	if err := syscall.Fstat(f, &st); err != nil {
+		t.Errorf("Fstat after: %v", err)
+	} else if st.Nlink != 0 {
+		t.Errorf("Nlink of overwritten file: got %d, want 0", st.Nlink)
+	}
+
+}
+
+func ParallelFileOpen(t *testing.T, mnt string) {
+	fn := mnt + "/file"
+	if err := ioutil.WriteFile(fn, []byte("content"), 0644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	var wg sync.WaitGroup
+	one := func(b byte) {
+		f, err := os.OpenFile(fn, os.O_RDWR, 0644)
+		if err != nil {
+			t.Fatalf("OpenFile: %v", err)
+		}
+		var buf [10]byte
+		f.Read(buf[:])
+		buf[0] = b
+		f.WriteAt(buf[0:1], 2)
+		f.Close()
+		wg.Done()
+	}
+	for i := 0; i < 10; i++ {
+		wg.Add(1)
+		go one(byte(i))
+	}
+	wg.Wait()
+}
+
+func Link(t *testing.T, mnt string) {
+	link := mnt + "/link"
+	target := mnt + "/target"
+
+	if err := ioutil.WriteFile(target, []byte("hello"), 0644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	st := syscall.Stat_t{}
+	if err := syscall.Lstat(target, &st); err != nil {
+		t.Fatalf("Lstat before: %v", err)
+	}
+
+	beforeIno := st.Ino
+	if err := os.Link(target, link); err != nil {
+		t.Errorf("Link: %v", err)
+	}
+
+	if err := syscall.Lstat(link, &st); err != nil {
+		t.Fatalf("Lstat after: %v", err)
+	}
+
+	if st.Ino != beforeIno {
+		t.Errorf("Lstat after: got %d, want %d", st.Ino, beforeIno)
+	}
+}
+
+func RenameOverwriteDestNoExist(t *testing.T, mnt string) {
+	RenameOverwrite(t, mnt, false)
+}
+
+func RenameOverwriteDestExist(t *testing.T, mnt string) {
+	RenameOverwrite(t, mnt, true)
+}
+
+func RenameOverwrite(t *testing.T, mnt string, destExists bool) {
+	if err := os.Mkdir(mnt+"/dir", 0755); err != nil {
+		t.Fatalf("Mkdir: %v", err)
+	}
+	if err := ioutil.WriteFile(mnt+"/file", []byte("hello"), 0644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	if destExists {
+		if err := ioutil.WriteFile(mnt+"/dir/renamed", []byte("xx"), 0644); err != nil {
+			t.Fatalf("WriteFile dest: %v", err)
+		}
+	}
+
+	st := syscall.Stat_t{}
+	if err := syscall.Lstat(mnt+"/file", &st); err != nil {
+		t.Fatalf("Lstat before: %v", err)
+	}
+	beforeIno := st.Ino
+	if err := os.Rename(mnt+"/file", mnt+"/dir/renamed"); err != nil {
+		t.Errorf("Rename: %v", err)
+	}
+
+	if fi, err := os.Lstat(mnt + "/file"); err == nil {
+		t.Fatalf("Lstat old: %v", fi)
+	}
+
+	if err := syscall.Lstat(mnt+"/dir/renamed", &st); err != nil {
+		t.Fatalf("Lstat after: %v", err)
+	}
+
+	if got := st.Ino; got != beforeIno {
+		t.Errorf("got ino %d, want %d", got, beforeIno)
+	}
+}
+
+func ReadDir(t *testing.T, mnt string) {
+	f, err := os.Open(mnt)
+	if err != nil {
+		t.Fatalf("Open: %v", err)
+	}
+	defer f.Close()
+
+	// add entries after opening the directory
+	want := map[string]bool{}
+	for i := 0; i < 110; i++ {
+		// 40 bytes of filename, so 110 entries overflows a
+		// 4096 page.
+		nm := fmt.Sprintf("file%036x", i)
+		want[nm] = true
+		if err := ioutil.WriteFile(filepath.Join(mnt, nm), []byte("hello"), 0644); err != nil {
+			t.Fatalf("WriteFile %q: %v", nm, err)
+		}
+	}
+
+	names, err := f.Readdirnames(-1)
+	if err != nil {
+		t.Fatalf("ReadDir: %v", err)
+	}
+	got := map[string]bool{}
+	for _, e := range names {
+		got[e] = true
+	}
+	if len(got) != len(want) {
+		t.Errorf("got %d entries, want %d", len(got), len(want))
+	}
+	for k := range got {
+		if !want[k] {
+			t.Errorf("got unknown name %q", k)
+		}
+	}
+}

unionfs/unionfs_test.go

@@ -22,6 +22,7 @@ import (
 	"github.com/hanwen/go-fuse/fuse/nodefs"
 	"github.com/hanwen/go-fuse/fuse/pathfs"
 	"github.com/hanwen/go-fuse/internal/testutil"
+	"github.com/hanwen/go-fuse/posixtest"
 )
 
 func TestFilePathHash(t *testing.T) {
@@ -203,19 +204,7 @@ func TestUnionFsSymlink(t *testing.T) {
 	wd, clean := setupUfs(t)
 	defer clean()
 
-	err := os.Symlink("/foobar", wd+"/mnt/link")
-	if err != nil {
-		t.Fatalf("Symlink: %v", err)
-	}
-
-	val, err := os.Readlink(wd + "/mnt/link")
-	if err != nil {
-		t.Fatalf("Readlink: %v", err)
-	}
-
-	if val != "/foobar" {
-		t.Errorf("symlink mismatch: %v", val)
-	}
+	posixtest.SymlinkReadlink(t, wd+"/mnt")
 }
 
 func TestUnionFsSymlinkPromote(t *testing.T) {
@@ -447,16 +436,7 @@ func TestUnionFsMkdir(t *testing.T) {
 	wd, clean := setupUfs(t)
 	defer clean()
 
-	dirname := wd + "/mnt/subdir"
-	err := os.Mkdir(dirname, 0755)
-	if err != nil {
-		t.Fatalf("Mkdir: %v", err)
-	}
-
-	err = os.Remove(dirname)
-	if err != nil {
-		t.Fatalf("Remove: %v", err)
-	}
+	posixtest.MkdirRmdir(t, wd+"/mnt")
 }
 
 func TestUnionFsMkdirPromote(t *testing.T) {

zipfs/multizip.go

@@ -29,7 +29,7 @@ type MultiZipFs struct {
 }
 
 func (fs *MultiZipFs) OnAdd(ctx context.Context) {
-	n := fs.NewPersistentInode(ctx, &configRoot{}, nodefs.NodeAttr{Mode: syscall.S_IFDIR})
+	n := fs.NewPersistentInode(ctx, &configRoot{}, nodefs.StableAttr{Mode: syscall.S_IFDIR})
 
 	fs.AddChild("config", n, false)
 }
@@ -72,12 +72,12 @@ func (r *configRoot) Symlink(ctx context.Context, target string, base string, ou
 	}
 
 	_, parent := r.Parent()
-	ch := r.NewPersistentInode(ctx, root, nodefs.NodeAttr{Mode: syscall.S_IFDIR})
+	ch := r.NewPersistentInode(ctx, root, nodefs.StableAttr{Mode: syscall.S_IFDIR})
 	parent.AddChild(base, ch, false)
 
 	link := r.NewPersistentInode(ctx, &nodefs.MemSymlink{
 		Data: []byte(target),
-	}, nodefs.NodeAttr{Mode: syscall.S_IFLNK})
+	}, nodefs.StableAttr{Mode: syscall.S_IFLNK})
 	r.AddChild(base, link, false)
 	return link, 0
 }

zipfs/tarfs.go

@@ -52,7 +52,6 @@ func (r *tarRoot) OnAdd(ctx context.Context) {
 			// XXX handle error
 			break
 		}
-
 		if hdr.Typeflag == 'L' {
 			buf := bytes.NewBuffer(make([]byte, 0, hdr.Size))
 			io.Copy(buf, tr)
@@ -66,10 +65,6 @@ func (r *tarRoot) OnAdd(ctx context.Context) {
 			longName = nil
 		}
 
-		if strings.HasSuffix(hdr.Name, "/") {
-			continue
-		}
-
 		buf := bytes.NewBuffer(make([]byte, 0, hdr.Size))
 		io.Copy(buf, tr)
 		dir, base := filepath.Split(filepath.Clean(hdr.Name))
@@ -83,22 +78,49 @@ func (r *tarRoot) OnAdd(ctx context.Context) {
 			if ch == nil {
 				ch = p.NewPersistentInode(ctx,
 					&nodefs.Inode{},
-					nodefs.NodeAttr{Mode: syscall.S_IFDIR})
+					nodefs.StableAttr{Mode: syscall.S_IFDIR})
 				p.AddChild(comp, ch, false)
 			}
 			p = ch
 		}
 
-		if hdr.Typeflag == tar.TypeSymlink {
-			p.AddChild(base, r.NewPersistentInode(ctx, &nodefs.MemSymlink{
+		var attr fuse.Attr
+		HeaderToFileInfo(&attr, hdr)
+		switch hdr.Typeflag {
+		case tar.TypeSymlink:
+			l := &nodefs.MemSymlink{
 				Data: []byte(hdr.Linkname),
-			}, nodefs.NodeAttr{Mode: syscall.S_IFLNK}), false)
-		} else {
+			}
+			l.Attr = attr
+			p.AddChild(base, r.NewPersistentInode(ctx, l, nodefs.StableAttr{Mode: syscall.S_IFLNK}), false)
+
+		case tar.TypeLink:
+			log.Println("don't know how to handle Typelink")
+
+		case tar.TypeChar:
+			rf := &nodefs.MemRegularFile{}
+			rf.Attr = attr
+			p.AddChild(base, r.NewPersistentInode(ctx, rf, nodefs.StableAttr{Mode: syscall.S_IFCHR}), false)
+		case tar.TypeBlock:
+			rf := &nodefs.MemRegularFile{}
+			rf.Attr = attr
+			p.AddChild(base, r.NewPersistentInode(ctx, rf, nodefs.StableAttr{Mode: syscall.S_IFBLK}), false)
+		case tar.TypeDir:
+			rf := &nodefs.MemRegularFile{}
+			rf.Attr = attr
+			p.AddChild(base, r.NewPersistentInode(ctx, rf, nodefs.StableAttr{Mode: syscall.S_IFDIR}), false)
+		case tar.TypeFifo:
+			rf := &nodefs.MemRegularFile{}
+			rf.Attr = attr
+			p.AddChild(base, r.NewPersistentInode(ctx, rf, nodefs.StableAttr{Mode: syscall.S_IFIFO}), false)
+		case tar.TypeReg, tar.TypeRegA:
 			df := &nodefs.MemRegularFile{
 				Data: buf.Bytes(),
 			}
-			HeaderToFileInfo(&df.Attr, hdr)
-			p.AddChild(base, r.NewPersistentInode(ctx, df, nodefs.NodeAttr{}), false)
+			df.Attr = attr
+			p.AddChild(base, r.NewPersistentInode(ctx, df, nodefs.StableAttr{}), false)
+		default:
+			log.Printf("entry %q: unsupported type '%c'", hdr.Name, hdr.Typeflag)
 		}
 	}
 }

zipfs/tarfs_test.go

@@ -11,6 +11,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"strings"
 	"syscall"
 	"testing"
 	"time"
@@ -20,6 +21,7 @@ import (
 )
 
 var tarContents = map[string]string{
+	"emptydir/":       "",
 	"file.txt":        "content",
 	"dir/subfile.txt": "other content",
 }
@@ -48,14 +50,16 @@ func TestTar(t *testing.T) {
 		}
 
 		isLink := filepath.Base(k) == "link"
-
+		isDir := strings.HasSuffix(k, "/")
 		if isLink {
 			h.Typeflag = tar.TypeSymlink
 			h.Linkname = v
+		} else if isDir {
+			h.Typeflag = tar.TypeDir
 		}
 
 		w.WriteHeader(h)
-		if !isLink {
+		if !isLink && !isDir {
 			w.Write([]byte(v))
 		}
 	}
@@ -89,9 +93,15 @@ func TestTar(t *testing.T) {
 			if got != want {
 				t.Errorf("Readlink: got %q want %q", got, want)
 			}
+		} else if strings.HasSuffix(k, "/") {
+
+			if got, want := st.Mode, uint32(syscall.S_IFDIR|0464); got != want {
+				t.Errorf("dir %q: got mode %o, want %o", k, got, want)
+			}
+
 		} else {
 			if got, want := st.Mode, uint32(syscall.S_IFREG|0464); got != want {
-				t.Errorf("got mode %o, want %o", got, want)
+				t.Errorf("entry %q, got mode %o, want %o", k, got, want)
 			}
 
 			c, err := ioutil.ReadFile(p)

zipfs/zipfs.go

@@ -66,13 +66,13 @@ func (zr *zipRoot) OnAdd(ctx context.Context) {
 			ch := p.GetChild(component)
 			if ch == nil {
 				ch = p.NewPersistentInode(ctx, &nodefs.Inode{},
-					nodefs.NodeAttr{Mode: fuse.S_IFDIR})
+					nodefs.StableAttr{Mode: fuse.S_IFDIR})
 				p.AddChild(component, ch, true)
 			}
 
 			p = ch
 		}
-		ch := p.NewPersistentInode(ctx, &zipFile{file: f}, nodefs.NodeAttr{})
+		ch := p.NewPersistentInode(ctx, &zipFile{file: f}, nodefs.StableAttr{})
 		p.AddChild(base, ch, true)
 	}
 }