Set timeouts on Lookups in pathfilesystem.go.

examplelib/dummyfuse.go

@@ -198,3 +198,7 @@ func (self *DummyPathFuse) Create(name string, flags uint32, mode uint32) (file
 func (self *DummyPathFuse) Utimens(name string, AtimeNs uint64, CtimeNs uint64) (code fuse.Status) {
 	return fuse.ENOSYS
 }
+
+func (self *DummyPathFuse) SetOptions(*fuse.PathFileSystemConnectorOptions) {
+	
+}

examplelib/passthrough.go

@@ -150,6 +150,12 @@ func (self *PassThroughFuse) Create(path string, flags uint32, mode uint32) (fus
 	return &PassThroughFile{file: f}, fuse.OsErrorToFuseError(err)
 }
 
+func (self *PassThroughFuse) SetOptions(options *fuse.PathFileSystemConnectorOptions) {
+	options.NegativeTimeout = 100.0
+	options.AttrTimeout = 100.0
+	options.EntryTimeout = 100.0
+}
+
 ////////////////////////////////////////////////////////////////
 
 type PassThroughFile struct {
@@ -251,3 +257,4 @@ func (self *PassThroughDir) ReleaseDir() {
 func (self *PassThroughDir) FsyncDir(input *fuse.FsyncIn) (code fuse.Status) {
 	return fuse.ENOSYS
 }
+

fuse/misc.go

@@ -10,6 +10,7 @@ import (
 	"time"
 	"fmt"
 	"path"
+	"math"
 )
 
 // Make a temporary directory securely.
@@ -206,3 +207,8 @@ func parseLittleEndian(b *bytes.Buffer, data interface{}) bool {
 	}
 	panic(fmt.Sprintf("Cannot parse %v", data))
 }
+
+func SplitNs(time float64, secs *uint64, nsecs *uint32) {
+	*nsecs = uint32(1e9 * (time - math.Trunc(time)))
+	*secs = uint64(math.Trunc(time))
+}

fuse/pathfilesystem.go

@@ -47,6 +47,11 @@ func (self *inodeData) GetPath() string {
 	return fullPath
 }
 
+type PathFileSystemConnectorOptions struct {
+	EntryTimeout float64
+	AttrTimeout float64
+	NegativeTimeout float64
+}
 
 type PathFileSystemConnector struct {
 	fileSystem PathFilesystem
@@ -67,6 +72,8 @@ type PathFileSystemConnector struct {
 	inodePathMap        map[string]*inodeData
 	inodePathMapByInode map[uint64]*inodeData
 	nextFreeInode uint64
+
+	options PathFileSystemConnectorOptions
 }
 
 // Must be called with lock held.
@@ -204,7 +211,6 @@ func NewPathFileSystemConnector(fs PathFilesystem) (out *PathFileSystemConnector
 	out = new(PathFileSystemConnector)
 	out.inodePathMap = make(map[string]*inodeData)
 	out.inodePathMapByInode = make(map[uint64]*inodeData)
-
 	out.fileSystem = fs
 
 	rootData := new(inodeData)
@@ -214,6 +220,12 @@ func NewPathFileSystemConnector(fs PathFilesystem) (out *PathFileSystemConnector
 	out.inodePathMapByInode[FUSE_ROOT_ID] = rootData
 	out.nextFreeInode = FUSE_ROOT_ID + 1
 
+	out.options.NegativeTimeout = 0.0
+	out.options.AttrTimeout = 1.0
+	out.options.EntryTimeout = 1.0
+
+	fs.SetOptions(&out.options)
+	
 	return out
 }
 
@@ -240,8 +252,14 @@ func (self *PathFileSystemConnector) Lookup(header *InHeader, name string) (out
 	
 	fullPath := path.Join(parent.GetPath(), name)
 	attr, err := self.fileSystem.GetAttr(fullPath)
+	if err == ENOENT && self.options.NegativeTimeout > 0.0 {
+		out = new(EntryOut)
+		out.NodeId = 0
+		SplitNs(self.options.NegativeTimeout, &out.EntryValid, &out.EntryValidNsec)
+		return out, OK
+	}
+
 	if err != OK {
-		// TODO - set a EntryValid timeout on ENOENT.
 		return nil, err
 	}
 
@@ -250,11 +268,9 @@ func (self *PathFileSystemConnector) Lookup(header *InHeader, name string) (out
 	out = new(EntryOut)
 	out.NodeId = data.NodeId
 	out.Generation = 1 // where to get the generation?
-	out.EntryValid = 0
-	out.AttrValid = 0
 
-	out.EntryValidNsec = 0
-	out.AttrValidNsec = 0
+	SplitNs(self.options.EntryTimeout, &out.EntryValid, &out.EntryValidNsec)
+	SplitNs(self.options.AttrTimeout, &out.AttrValid, &out.AttrValidNsec)
 	out.Attr = *attr
 
 	return out, OK

fuse/types.go

@@ -581,4 +581,6 @@ type PathFilesystem interface {
 	Utimens(name string, AtimeNs uint64, CtimeNs uint64) (code Status)
 
 	// unimplemented: poll, ioctl, bmap.
+
+	SetOptions(*PathFileSystemConnectorOptions)
 }