Initial commit

Proof-of-concept implementation. Bugs will occur.

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

@@ -0,0 +1,50 @@
+//go:build linux
+// +build linux
+
+// 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 (
+	"context"
+	"syscall"
+
+	"github.com/hanwen/go-fuse/v2/fuse"
+	"golang.org/x/sys/unix"
+)
+
+const unix_UTIME_OMIT = unix.UTIME_OMIT
+
+func doCopyFileRange(fdIn int, offIn int64, fdOut int, offOut int64,
+	len int, flags int) (uint32, syscall.Errno) {
+	count, err := unix.CopyFileRange(fdIn, &offIn, fdOut, &offOut, len, flags)
+	return uint32(count), ToErrno(err)
+}
+
+func intDev(dev uint32) int {
+	return int(dev)
+}
+
+var _ = (NodeStatxer)((*LoopbackNode)(nil))
+
+func (n *LoopbackNode) Statx(ctx context.Context, f FileHandle,
+	flags uint32, mask uint32,
+	out *fuse.StatxOut) syscall.Errno {
+	if f != nil {
+		if fga, ok := f.(FileStatxer); ok {
+			return fga.Statx(ctx, flags, mask, out)
+		}
+	}
+
+	p := n.path()
+
+	st := unix.Statx_t{}
+	err := unix.Statx(unix.AT_FDCWD, p, int(flags), int(mask), &st)
+	if err != nil {
+		return ToErrno(err)
+	}
+	out.FromStatx(&st)
+	return OK
+}