mountlib: make Node satisfy os.FileInfo interface

cmd/cmount/fs.go

@@ -203,11 +203,9 @@ func (fsys *FS) stat(node mountlib.Node, stat *fuse.Stat_t) (errc int) {
 		modTime = x.ModTime()
 		Mode = mountlib.DirPerms | fuse.S_IFDIR
 	case *mountlib.File:
-		var err error
-		modTime, Size, Blocks, err = x.Attr(mountlib.NoModTime)
-		if err != nil {
-			return translateError(err)
-		}
+		modTime = x.ModTime()
+		Size = uint64(x.Size())
+		Blocks = (Size + 511) / 512
 		Mode = mountlib.FilePerms | fuse.S_IFREG
 	}
 	//stat.Dev = 1
@@ -392,10 +390,7 @@ func (fsys *FS) Truncate(path string, size int64, fh uint64) (errc int) {
 		return -fuse.EIO
 	}
 	// Read the size so far
-	_, currentSize, _, err := file.Attr(true)
-	if err != nil {
-		return translateError(err)
-	}
+	currentSize := file.Size()
 	fs.Debugf(path, "truncate to %d, currentSize %d", size, currentSize)
 	if int64(currentSize) != size {
 		fs.Errorf(path, "Can't truncate files")

cmd/mount/file.go

@@ -30,10 +30,9 @@ var _ fusefs.Node = (*File)(nil)
 // Attr fills out the attributes for the file
 func (f *File) Attr(ctx context.Context, a *fuse.Attr) (err error) {
 	defer fs.Trace(f, "")("a=%+v, err=%v", a, &err)
-	modTime, Size, Blocks, err := f.File.Attr(mountlib.NoModTime)
-	if err != nil {
-		return translateError(err)
-	}
+	modTime := f.File.ModTime()
+	Size := uint64(f.File.Size())
+	Blocks := (Size + 511) / 512
 	a.Gid = mountlib.GID
 	a.Uid = mountlib.UID
 	a.Mode = mountlib.FilePerms

cmd/mountlib/dir.go

@@ -1,6 +1,7 @@
 package mountlib
 
 import (
+	"os"
 	"path"
 	"strings"
 	"sync"
@@ -55,6 +56,30 @@ func (d *Dir) IsFile() bool {
 	return false
 }
 
+// IsDir returns true for Dir - satisfies Node interface
+func (d *Dir) IsDir() bool {
+	return true
+}
+
+// Mode bits of the directory - satisfies Node interface
+func (d *Dir) Mode() (mode os.FileMode) {
+	return os.ModeDir | 0777
+}
+
+// Name (base) of the directory - satisfies Node interface
+func (d *Dir) Name() (name string) {
+	name = path.Base(d.path)
+	if name == "." {
+		name = "/"
+	}
+	return name
+}
+
+// Sys returns underlying data source (can be nil) - satisfies Node interface
+func (d *Dir) Sys() interface{} {
+	return nil
+}
+
 // Inode returns the inode number - satisfies Node interface
 func (d *Dir) Inode() uint64 {
 	return d.inode
@@ -242,6 +267,11 @@ func (d *Dir) ModTime() time.Time {
 	return d.modTime
 }
 
+// Size of the directory
+func (d *Dir) Size() int64 {
+	return 0
+}
+
 // SetModTime sets the modTime for this dir
 func (d *Dir) SetModTime(modTime time.Time) error {
 	if d.fsys.readOnly {

cmd/mountlib/file.go

@@ -1,6 +1,7 @@
 package mountlib
 
 import (
+	"os"
 	"path"
 	"sync"
 	"sync/atomic"
@@ -45,6 +46,26 @@ func (f *File) IsFile() bool {
 	return true
 }
 
+// IsDir returns false for File - satisfies Node interface
+func (f *File) IsDir() bool {
+	return false
+}
+
+// Mode bits of the file or directory - satisfies Node interface
+func (f *File) Mode() (mode os.FileMode) {
+	return 0666
+}
+
+// Name (base) of the directory - satisfies Node interface
+func (f *File) Name() (name string) {
+	return path.Base(f.o.Remote())
+}
+
+// Sys returns underlying data source (can be nil) - satisfies Node interface
+func (f *File) Sys() interface{} {
+	return nil
+}
+
 // Inode returns the inode number - satisfies Node interface
 func (f *File) Inode() uint64 {
 	return f.inode
@@ -70,25 +91,37 @@ func (f *File) addWriters(n int) {
 	f.mu.Unlock()
 }
 
-// Attr fills out the attributes for the file
-func (f *File) Attr(noModTime bool) (modTime time.Time, Size, Blocks uint64, err error) {
+// ModTime returns the modified time of the file
+//
+// if NoModTime is set then it returns the mod time of the directory
+func (f *File) ModTime() (modTime time.Time) {
 	f.mu.Lock()
 	defer f.mu.Unlock()
-	// if o is nil it isn't valid yet or there are writers, so return the size so far
-	if f.o == nil || f.writers != 0 {
-		Size = uint64(atomic.LoadInt64(&f.size))
-		if !noModTime && !f.pendingModTime.IsZero() {
-			modTime = f.pendingModTime
-		}
-	} else {
-		Size = uint64(f.o.Size())
-		if !noModTime {
-			modTime = f.o.ModTime()
+
+	if !f.d.fsys.noModTime {
+		// if o is nil it isn't valid yet or there are writers, so return the size so far
+		if f.o == nil || f.writers != 0 {
+			if !f.pendingModTime.IsZero() {
+				return f.pendingModTime
+			}
+		} else {
+			return f.o.ModTime()
 		}
 	}
-	Blocks = (Size + 511) / 512
-	// fs.Debugf(f.o, "File.Attr modTime=%v, Size=%d, Blocks=%v", modTime, Size, Blocks)
-	return
+
+	return f.d.modTime
+}
+
+// Size of the file
+func (f *File) Size() int64 {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+
+	// if o is nil it isn't valid yet or there are writers, so return the size so far
+	if f.o == nil || f.writers != 0 {
+		return atomic.LoadInt64(&f.size)
+	}
+	return f.o.Size()
 }
 
 // SetModTime sets the modtime for the file

cmd/mountlib/fs.go

@@ -2,6 +2,7 @@ package mountlib
 
 import (
 	"fmt"
+	"os"
 	"strings"
 	"sync/atomic"
 	"time"
@@ -11,8 +12,11 @@ import (
 
 // Node represents either a *Dir or a *File
 type Node interface {
+	os.FileInfo
 	IsFile() bool
 	Inode() uint64
+	SetModTime(modTime time.Time) error
+	Fsync() error
 }
 
 var (
@@ -40,6 +44,7 @@ type FS struct {
 	noSeek       bool          // don't allow seeking if set
 	noChecksum   bool          // don't check checksums if set
 	readOnly     bool          // if set FS is read only
+	noModTime    bool          // don't read mod times for files
 	dirCacheTime time.Duration // how long to consider directory listing cache valid
 }
 
@@ -59,6 +64,9 @@ func NewFS(f fs.Fs) *FS {
 	if ReadOnly {
 		fsys.readOnly = true
 	}
+	if NoModTime {
+		fsys.noModTime = true
+	}
 	fsys.dirCacheTime = DirCacheTime
 
 	fsys.root = newDir(fsys, f, fsDir)