vendor: add github.com/hanwen/go-fuse/v2@master for mount2

vendor/github.com/hanwen/go-fuse/v2/fs/constants.go

@@ -0,0 +1,29 @@
+// 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 fs
+
+import (
+	"syscall"
+
+	"github.com/hanwen/go-fuse/v2/fuse"
+)
+
+// OK is the Errno return value to indicate absense of errors.
+var OK = syscall.Errno(0)
+
+// ToErrno exhumes the syscall.Errno error from wrapped error values.
+func ToErrno(err error) syscall.Errno {
+	s := fuse.ToStatus(err)
+	return syscall.Errno(s)
+}
+
+// RENAME_EXCHANGE is a flag argument for renameat2()
+const RENAME_EXCHANGE = 0x2
+
+// seek to the next data
+const _SEEK_DATA = 3
+
+// seek to the next hole
+const _SEEK_HOLE = 4