fuse: implement Lseek

fuse/api.go

@@ -239,6 +239,7 @@ type RawFileSystem interface {
 	Create(cancel <-chan struct{}, input *CreateIn, name string, out *CreateOut) (code Status)
 	Open(cancel <-chan struct{}, input *OpenIn, out *OpenOut) (status Status)
 	Read(cancel <-chan struct{}, input *ReadIn, buf []byte) (ReadResult, Status)
+	Lseek(cancel <-chan struct{}, in *LseekIn, out *LseekOut) Status
 
 	// File locking
 	GetLk(cancel <-chan struct{}, input *LkIn, out *LkOut) (code Status)

fuse/defaultraw.go

@@ -162,3 +162,7 @@ func (fs *defaultRawFileSystem) Fallocate(cancel <-chan struct{}, in *FallocateI
 func (fs *defaultRawFileSystem) CopyFileRange(cancel <-chan struct{}, input *CopyFileRangeIn) (written uint32, code Status) {
 	return 0, ENOSYS
 }
+
+func (fs *defaultRawFileSystem) Lseek(cancel <-chan struct{}, in *LseekIn, out *LseekOut) Status {
+	return ENOSYS
+}

fuse/nodefs/fsops.go

@@ -498,3 +498,7 @@ func (c *rawBridge) Flush(cancel <-chan struct{}, input *fuse.FlushIn) fuse.Stat
 func (c *rawBridge) CopyFileRange(cancel <-chan struct{}, input *fuse.CopyFileRangeIn) (written uint32, code fuse.Status) {
 	return 0, fuse.ENOSYS
 }
+
+func (fs *rawBridge) Lseek(cancel <-chan struct{}, in *fuse.LseekIn, out *fuse.LseekOut) fuse.Status {
+	return fuse.ENOSYS
+}

fuse/opcode.go

@@ -441,6 +441,12 @@ func doSetLkw(server *Server, req *request) {
 	req.status = server.fileSystem.SetLkw(req.cancel, (*LkIn)(req.inData))
 }
 
+func doLseek(server *Server, req *request) {
+	in := (*LseekIn)(req.inData)
+	out := (*LseekOut)(req.outData())
+	req.status = server.fileSystem.Lseek(req.cancel, in, out)
+}
+
 func doCopyFileRange(server *Server, req *request) {
 	in := (*CopyFileRangeIn)(req.inData)
 	out := (*WriteOut)(req.outData())
@@ -683,6 +689,7 @@ func init() {
 		_OP_RENAME2:         doRename2,
 		_OP_INTERRUPT:       doInterrupt,
 		_OP_COPY_FILE_RANGE: doCopyFileRange,
+		_OP_LSEEK:           doLseek,
 	} {
 		operationHandlers[op].Func = v
 	}